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In this note we give a numerical expression for the bandwidth $bw(P_{n}^{d})$ of the $d$-product of a path with $n$ edges, $P_{n}^{d}$. We prove that this bandwidth is given by the sum of certain multinomial coefficients. We also show that $bw(P_{n}^{d})$ is bounded above and below by the largest coefficient in the expansion of $(1+x+...+x^{n})^{k}$, with $k\in{d,d+1}$. Moreover, we compare the asymptotic behavior of $bw(P_{n}^{d})$ with the bandwidth of the labeling obtained by ordering the...
Source: http://arxiv.org/abs/1209.3201v1

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47 47

Nuclear Dependence of Charm Production

Sep 21, 2013 09/13

by The SELEX Collaboration; A. Blanco-Covarrubias; J. Engelfried

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With data taken by SELEX, which accumulated data during the 1996-1997 fixed target run at Fermilab, we study the production of charmed hadrons on copper and carbon targets with Sigma-, p, pi-, and pi+ beams. Parameterizing the production cross section A^alpha, A being the atomic number, we determine alpha for D+, D0, Ds+, D+(2010), Lambda_c+, and their respective anti-particles, as a function of their transverse momentum pt and scaled longitudinal momentum xF. Within our statistics there is no...
Source: http://arxiv.org/abs/0902.0355v2

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53 53

Electron iduced light emission in photonic crystals

Sep 18, 2013 09/13

by L. A. Blanco; F. J. Garcia de Abajo

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The interaction of a fast electron with a photonic crystal is studied by solving the Maxwell equations exactly for the external field provided by the electron in the presence of the crystal. The polarization currents and charges produced by the passage of the electron give rise to the emission of the so-called Smith-Purcell radiation. The emitted light probability is obtained by integrating the Poynting vector over planes parallel to the crystal at a large distance from the latter. Both...
Source: http://arxiv.org/abs/cond-mat/0210298v1

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43 43

Electron energy loss and induced photon emission in photonic crystals

Sep 18, 2013 09/13

by F. J. Garcia de Abajo; L. A. Blanco

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The interaction of a fast electron with a photonic crystal is investigated by solving the Maxwell equations exactly for the external field provided by the electron in the presence of the crystal. The energy loss is obtained from the retarding force exerted on the electron by the induced electric field. The features of the energy loss spectra are shown to be related to the photonic band structure of the crystal. Two different regimes are discussed: for small lattice constants $a$ relative to the...
Source: http://arxiv.org/abs/cond-mat/0210301v1

Arxiv.org

39 39

$Antiferro--quadrupolar structures in UPd$_3$ inferred from x-ray resonant Bragg diffraction$

Antiferro--quadrupolar structures in UPd$_3$ inferred from x-ray resonant Bragg diffraction

Sep 19, 2013 09/13

by Javier Fernandez-Rodriguez; Stephen W. Lovesey; Jesus A. Blanco

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A systematic analysis of resonant x-ray Bragg diffraction data for UPd$_3$, with signal enhancement at the U M$_{IV}$ edge, including possible structural phase-transitions leads to a new determination of the space groups of the material in the phases between $T_0 = 7.8$ K and $T_{+1}$ = 6.9 K as P222$_1$ and between $T_{-1}$ = 6.7 K and $T_{2}$ = 4.4 K as space group P2$_1$. In addition, the quadrupolar order-parameters, $$, inferred from diffraction data in the phase between $T_{-1}$ and...
Source: http://arxiv.org/abs/0909.3447v3

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49 49

Parity-odd multipoles, magnetic charges and chirality in haematite (alfa-Fe2O3)

Sep 19, 2013 09/13

by S. W. Lovesey; A. Rodriguez-Fernandez; J. A. Blanco

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Collinear and canted magnetic motifs in haematite were investigated by Kokubun et al. (2008) using x-ray Bragg diffraction magnified at the iron K-edge, and analyses of observations led to various potentially interesting conclusions. We demonstrate that the reported analyses for both non-resonant and resonant magnetic diffraction at low energies near the absorption K-edge are not appropriate. In its place, we apply a radically different formulation, thoroughly tried and tested, that...
Source: http://arxiv.org/abs/1010.1686v3

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59 59

Extended van Royen-Weisskopf formalism for lepton-antilepton meson decay widths within non-relativistic quark models

Sep 23, 2013 09/13

by L. A. Blanco; R. Bonnaz; B. Silvestre-Brac; F. Fernandez; A. Valcarce

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The classical van Royen-Weisskopf formula for the decay width of a meson into a lepton-antilepton pair is modified in order to include non-zero quark momentum contributions within the meson as well as relativistic effects. Besides, a phenomenological electromagnetic density for quarks is introduced. The meson wave functions are obtained from two different models: a chiral constituent quark model and a quark potential model including instanton effects. The modified van Royen-Weisskopf formula is...
Source: http://arxiv.org/abs/nucl-th/0109080v1

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47 47

Tunneling mechanism of light transmission through metallic films

Sep 19, 2013 09/13

by F. J. Garcia de Abajo; G. Gomez-Santos; L. A. Blanco; A. G. Borisov; S. V. Shabanov

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A mechanism of light transmission through metallic films is proposed, assisted by tunnelling between resonating buried dielectric inclusions. This is illustrated by arrays of Si spheres embedded in Ag. Strong transmission peaks are observed near the Mie resonances of the spheres. The interaction among various planes of spheres and interference effects between these resonances and the surface plasmons of Ag lead to mixing and splitting of the resonances. Transmission is proved to be limited only...
Source: http://arxiv.org/abs/0708.0994v1

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62 62

$Experimental evidence of anapolar moments in the antiferromagnetic insulating phase of V2O3 obtained from x-ray resonant Bragg diffraction$

Experimental evidence of anapolar moments in the antiferromagnetic insulating phase of V2O3 obtained from x-ray resonant Bragg diffraction

Sep 22, 2013 09/13

by J. Fernandez-Rodriguez; V. Scagnoli; C. Mazzoli; F. Fabrizi; S. W. Lovesey; J. A. Blanco; D. S. Sivia; K. S. Knight; F. de Bergevin; L. Paolasini

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We have investigated the antiferromagnetic insulating phase of the Mott-Hubbard insulator V$_2$O$_3$ by resonant x-ray Bragg diffraction at the vanadium K-edge. Combining the information obtained from azimuthal angle scans, linear incoming polarization scans and by fitting collected data to the scattering amplitude derived from the established chemical I2/a and magnetic space groups we provide evidence of the ordering motif of anapolar moments (which results from parity violation coupling to an...
Source: http://arxiv.org/abs/0906.3541v1

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6 6.0

Design and expected performance of a novel hybrid detector for very-high-energy gamma astrophysics

Jun 29, 2018 06/18

by P. Assis; U. Barres de Almeida; A. Blanco; R. Conceição; B. D'Ettore Piazzoli; A. De Angelis; M. Doro; P. Fonte; L. Lopes; G. Matthiae; M. Pimenta; R. Shellard; B. Tomé

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Current detectors for Very-High-Energy $\gamma$-ray astrophysics are either pointing instruments with a small field of view (Cherenkov telescopes), or large field-of-view instruments with relatively large energy thresholds (extensive air shower detectors). In this article we propose a new hybrid extensive air shower detector sensitive in an energy region starting from about 100 GeV, allowing to detect with a $5\sigma$ significance a source as faint as 10% of the Crab Nebula in one year, and...
Topics: Astrophysics, High Energy Astrophysical Phenomena, Instrumentation and Methods for Astrophysics,...
Source: http://arxiv.org/abs/1607.03051

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5 5.0

LATTES: a new gamma-ray detector concept for South America

Jun 30, 2018 06/18

by P. Assis; U. Barres de Almeida; A. Blanco; R. Conceição; B. D'Ettoree Piazzoli; A. de Angelis; M. Doro; P. Fonte; L. Lopes; G. Matthiae; M. Pimenta; R. Shellard; B. Tomé

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Currently the detection of Very High Energy gamma-rays for astrophysics rely on the measurement of the Extensive Air Showers (EAS) either using Cherenkov detectors or EAS arrays with larger field of views but also larger energy thresholds. In this talk we present a novel hybrid detector concept for a EAS array with an improved sensitivity in the lower energies ($\sim 100\,$GeV). We discuss its main features, capabilities and present preliminary results on its expected perfomances and...
Topics: High Energy Physics - Experiment, Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1703.09254

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50 50

Performances of multi-gap timing RPCs for relativistic ions in the range Z=1-6

Sep 21, 2013 09/13

by P. Cabanelas; M. Morales; J. A. Garzon; A. Gil; D. Gonzalez-Diaz; A. Blanco; D. Belver; E. Casarejos; P. Fonte; W. Koenig; L. Lopes; M. Palka; J. Pietraszko; M. Traxler; M. Weber

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We present the performance of Multi-gap timing RPCs under irradiation by fully stripped relativistic ions (gamma*beta=2.7, Z=1-6). A time resolution of 80 ps at high efficiency has been obtained by just using standard `off the shelf' 4-gap timing RPCs from the new HADES ToF wall. The resolution worsened to 100 ps for ~ 1 kHz/cm2 proton flux and for ~ 100 Hz/cm2 Carbon flux. The chambers were operated at a standard field of E=100 kV/cm and showed a high stability during the experiment,...
Source: http://arxiv.org/abs/0905.0682v2

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4 4.0

TRAGALDABAS. First results on cosmic ray studies and their relation with the solar activity, the Earth magnetic field and the atmospheric properties

Jun 30, 2018 06/18

by J. A. Garzón; J. Collazo; J. Cuenca-García; D. Garcí a Castro; J. Otero; M. Yermo; J. J. Blanco; T. Kurtukian; A. Morozova; M. A. Pais; A. Blanco; P. Fonte; L. Lopes; G. Kornakov; H. Álvarez-Pol; P. Cabanelas; A. Pazos; M. Seco; I. Riádigos; V. Pérez Muñuzuri; A. Gómez-Tato; J. C. Mouriño; P. Rey; J. Taboada

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Cosmic rays originating from extraterrestrial sources are permanently arriving at Earth atmosphere, where they produce up to billions of secondary particles. The analysis of the secondary particles reaching to the surface of the Earth may provide a very valuable information about the Sun activity, changes in the geomagnetic field and the atmosphere, among others. In this article, we present the first preliminary results of the analysis of the cosmic rays measured with a high resolution tracking...
Topics: Instrumentation and Methods for Astrophysics, Instrumentation and Detectors, Physics, Astrophysics,...
Source: http://arxiv.org/abs/1701.07277

Arxiv.org

42 42

Dielectron production in Ar+KCl collisions at 1.76A GeV

Sep 22, 2013 09/13

by G. Agakishiev; A. Balanda; D. Belver; A. Belyaev; A. Blanco; M. Böhmer; J. L. Boyard; P. Cabanelas; E. Castro; S. Chernenko; T. Christ; M. Destefanis; F. Dohrmann; A. Dybczak; T. Eberl; E. Epple; L. Fabbbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzon; R. Gernhäuser; C. Gilardi; M. Golubeva; D. Gonzalez-Díaz; F. Guber; M. Gumberidze; T. Heinz; T. Hennino; R. Holzmann; P. Huck; I. Iori; A. Ivashkin; M. Jurkovic; B. Kämpfer; K. Kanaki; T....

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We present results on dielectron production in Ar+KCl collisions at 1.76A GeV. For the first time $\omega$ mesons could be reconstructed in a heavy-ion reaction at a bombarding energy which is well below the production threshold in free nucleon-nucleon collisions. The omega multiplicity has been extracted and compared to the yields of other particles, in particular of the phi meson. At intermediate e+e- invariant masses, we find a strong enhancement of the pair yield over a reference spectrum...
Source: http://arxiv.org/abs/1103.0876v2

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52 52

First measurement of low momentum dielectrons radiated off cold nuclear matter

Sep 20, 2013 09/13

by G. Agakishiev; A. Balanda; D. Belver; A. Belyaev; J. C. Berger-Chen; A. Blanco; M. Böhmer; J. L. Boyard; P. Cabanelas; S. Chernenko; A. Dybczak; E. Epple; L. Fabbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzón; R. Gernhäuser; K. Göbel; M. Golubeva; D. González-Díaz; F. Guber; M. Gumberidze; T. Heinz; T. Hennino; R. Holzmann; A. Ierusalimov; I. Iori; A. Ivashkin; M. Jurkovic; B. Kämpfer; T. Karavicheva; I. Koenig; W. Koenig; B. W. Kolb; G....

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We present data on dielectron emission in proton induced reactions on a Nb target at 3.5 GeV kinetic beam energy measured with HADES installed at GSI. The data represent the first high statistics measurement of proton-induced dielectron radiation from cold nuclear matter in a kinematic regime, where strong medium effects are expected. Combined with the good mass resolution of 2%, it is the first measurement sensitive to changes of the spectral functions of vector mesons, as predicted by models...
Source: http://arxiv.org/abs/1205.1918v2

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6 6.0

Baryon resonance production and dielectron decays in proton-proton collisions at 3.5 GeV

Jun 30, 2018 06/18

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We report on baryon resonance production and decay in proton-proton collisions at a kinetic energy of $3.5$ GeV based on data measured with HADES. The exclusive channels $pp \rightarrow np\pi^{+}$ and $pp \rightarrow pp\pi^{0}$ as well as $pp \rightarrow ppe^{+}e^{-}$ are studied simultaneously for the first time. The invariant masses and angular distributions of the pion-nucleon systems were studied and compared to simulations based on a resonance model ansatz assuming saturation of the pion...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1403.3054

Arxiv.org

49 49

Origin of the low-mass electron pair excess in light nucleus-nucleus collisions

Sep 19, 2013 09/13

by The HADES Collaboration; G. Agakishiev; A. Balanda; D. Belver; A. V. Belyaev; A. Blanco; M. Böhmer; J. L. Boyard; P. Braun-Munzinger; P. Cabanelas; E. Castro; S. Chernenko; T. Christ; M. Destefanis; J. Díaz; F. Dohrmann; A. Dybczak; L. Fabbietti; O. V. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzón; R. Gernhäuser; A. Gil; C. Gilardi; M. Golubeva; D. González-Díaz; F. Guber; T. Hennino; R. Holzmann; I. Iori; A. Ivashkin; M. Jurkovic; B. Kämpfer; T....

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We report measurements of electron pair production in elementary p+p and d+p reactions at 1.25 GeV/u with the HADES spectrometer. For the first time, the electron pairs were reconstructed for n+p reactions by detecting the proton spectator from the deuteron breakup. We find that the yield of electron pairs with invariant mass Me+e- > 0.15 GeV/c2 is about an order of magnitude larger in n+p reactions as compared to p+p. A comparison to model calculations demonstrates that the production...
Source: http://arxiv.org/abs/0910.5875v1

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23 23

K*(892)+ production in proton-proton collisions at E_beam = 3.5 GeV

Jun 27, 2018 06/18

by HADES Collaboration; G. Agakishiev; O. Arnold; D. Belver; A. Belyaev; J. C. Berger-Chen; A. Blanco; M. Böhmer; J. L. Boyard; P. Cabanelas; S. Chernenko; A. Dybczak; E. Epple; L. Fabbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzón; R. Gernhäuser; K. Göbel; M. Golubeva; D. González-Díaz; F. Guber; M. Gumberidze; T. Heinz; T. Hennino; R. Holzmann; A. Ierusalimov; I. Iori; A. Ivashkin; M. Jurkovic; B. Kämpfer; T. Karavicheva; I. Koenig; W....

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We present results on the K*(892)+ production in proton-proton collisions at a beam energy of E = 3.5 GeV, which is hitherto the lowest energy at which this mesonic resonance has been observed in nucleon-nucleon reactions. The data are interpreted within a two-channel model that includes the 3-body production of K*(892)+ associated with the Lambda- or Sigma-hyperon. The relative contributions of both channels are estimated. Besides the total cross section sigma(p+p -> K*(892)+ + X) = 9.5 +-...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1505.06184

Arxiv.org

5 5.0

$Partial Wave Analysis of the Reaction $p(3.5 GeV)+p \to pK^+\Lambda$ to Search for the "$ppK^-$" Bound State$

Partial Wave Analysis of the Reaction $p(3.5 GeV)+p \to pK^+\Lambda$ to Search for the "$ppK^-$" Bound State

Jun 30, 2018 06/18

by G. Agakishiev; O. Arnold; D. Belver; A. Belyaev; J. C. Berger-Chen; A. Blanco; M. Böhmer; J. L. Boyard; P. Cabanelas; S. Chernenko; A. Dybczak; E. Epple; L. Fabbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzón; R. Gernhäuser; K. Göbel; M. Golubeva; D. González-Díaz; F. Guber; M. Gumberidze; T. Heinz; T. Hennino; R. Holzmann; A. Ierusalimov; I. Iori; A. Ivashkin; M. Jurkovic; B. Kämpfer; T. Karavicheva; I. Koenig; W. Koenig; B. W. Kolb; G....

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Employing the Bonn-Gatchina partial wave analysis framework (PWA), we have analyzed HADES data of the reaction $p(3.5GeV)+p\to pK^{+}\Lambda$. This reaction might contain information about the kaonic cluster "$ppK^-$" via its decay into $p\Lambda$. Due to interference effects in our coherent description of the data, a hypothetical $\overline{K}NN$ (or, specifically "$ppK^-$") cluster signal must not necessarily show up as a pronounced feature (e.g. a peak) in an invariant...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1410.8188

Arxiv.org

44 44

$Production of Sigma{\pm}pi?pK+ in p+p reactions at 3.5 GeV beam energy$

Production of Sigma{\pm}pi?pK+ in p+p reactions at 3.5 GeV beam energy

Sep 24, 2013 09/13

by G. Agakishiev; A. Balanda; D. Belver; A. Belyaev; J. C. Berger-Chen; A. Blanco; M. Boehmer; J. L. Boyard; P. Cabanelas; E. Castro; S. Chernenko; T. Christ M. Destefanis; F. Dohrmann; A. Dybczak; E. Epple; L. Fabbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzon; R. Gernhäuser; C. Gilardi; M. Golubeva; D. Gonza'lez-Di'az; F. Guber; M. Gumberidze; T. Heinz; T. Hennino; R. Holzmann; A. Ierusalimov; I. Iori; A. Ivashkin; M. Jurkovic; B. Kämpfer; K....

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We study the production of Sigma^+-pi^+-pK^+ particle quartets in p+p reactions at 3.5 GeV kinetic beam energy. The data were taken with the HADES experiment at GSI. This report evaluates the contribution of resonances like Lambda(1405$, Sigma(1385)^0, Lambda(1520), Delta(1232), N^* and K^*0 to the Sigma^+- pi^-+ p K+ final state. The resulting simulation model is compared to the experimental data in several angular distributions and it shows itself as suitable to evaluate the acceptance...
Source: http://arxiv.org/abs/1202.2734v1

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9 9.0

Associate K^0 production in p+p collisions at 3.5 GeV: The role of Delta(1232)++

Jun 30, 2018 06/18

by G. Agakishiev; O. Arnold; A. Balanda; D. Belver; A. Belyaev; J. C. Berger-Chen; A. Blanco; M. Böhmer; J. L. Boyard; P. Cabanelas; S. Chernenko; A. Dybczak; E. Epple; L. Fabbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzón; R. Gernhäuser; K. Göbel; M. Golubeva; D. González-Díaz; F. Guber; M. Gumberidze; T. Heinz; T. Hennino; R. Holzmann; A. Ierusalimov; I. Iori; A. Ivashkin; M. Jurkovic; B. Kämpfer; T. Karavicheva; I. Koenig; W. Koenig; B. W....

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An exclusive analysis of the 4-body final states $\mathrm{\Lambda + p + \pi^{+} + K^{0}}$ and $\mathrm{\Sigma^{0} + p + \pi^{+} + K^{0}}$ measured with HADES for p+p collisions at a beam kinetic energy of 3.5 GeV is presented. The analysis uses various phase space variables, such as missing mass and invariant mass distributions, in the four particle event selection (p, $\pi^+$, $\pi^+$, $\pi^-$) to find cross sections of the different production channels, contributions of the intermediate...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1403.6662

Arxiv.org

6 6.0

Analysis of pion production data measured by HADES in proton-proton collisions at 1.25 GeV

Jun 30, 2018 06/18

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Baryon resonance production in proton-proton collisions at a kinetic beam energy of 1.25 GeV is investigated. The multi-differential data were measured by the HADES collaboration. Exclusive channels with one pion in the final state ($np\pi^{+}$ and $pp\pi^{0}$) were put to extended studies based on various observables in the framework of a one-pion exchange model and with solutions obtained within the framework of a partial wave analysis (PWA) of the Bonn-Gatchina group. The results of the PWA...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1703.08398

Arxiv.org

3 3.0

Lambda hyperon production and polarization in collisions of p(3.5 GeV) + Nb

Jun 30, 2018 06/18

by G. Agakishiev; O. Arnold; A. Balanda; D. Belver; A. V. Belyaev; J. C. Berger-Chen; A. Blanco; M. Böhmer; J. L. Boyard; P. Cabanelas; S. Chernenko; A. Dybczak; E. Epple; L. Fabbietti; O. V. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzon; R. Gernhäuser; K. Göbel; M. Golubeva; D. Gonzalez-Díaz; F. Guber; M. Gumberidze; T. Heinz; T. Hennino; R. Holzmann; A. Ierusalimov; I. Iori; A. Ivashkin; M. Jurkovic; B. Kämpfer; T. Karavicheva; I. Koenig; W. Koenig; B....

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Results on $\Lambda$ hyperon production are reported for collisions of p(3.5 GeV) + Nb, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18 at GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt. The transverse mass distributions in rapidity bins are well described by Boltzmann shapes with a maximum inverse slope parameter of about $90\,$MeV at a rapidity of $y=1.0$, i.e. slightly below the center-of-mass rapidity for nucleon-nucleon collisions, $y_{cm}=1.12$. The...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1404.3014

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52 52

Baryonic resonances close to the Kbar-N threshold: the case of Sigma(1385)^+ in pp collisions

Sep 23, 2013 09/13

by G. Agakishiev; A. Balanda; D. Belver; A. V. Belyaev; A. Blanco; M. Boehmer; J. L. Boyard; P. Cabanelas; E. Castro; J. C. Chen; S. Chernenko; T. Christ; M. Destefanis; F. Dohrmann; A. Dybczak; E. Epple; T. Eberl; L. Fabbietti; O. V. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Froehlich; T. Galatyuk; J. A. Garzon; R. Gernhaeuser; C. Gilardi; M. Golubeva; D. Gonzalez-Diaz; F. Guber; M. Gumberidze; T. Heinz; T. Hennino; R. Holzmann; I. Iori; A. Ivashkin; M. Jurkovic; B. Kaempfer; K. Kanaki; T....

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We present results of an exclusive measurement of the first excited state of the Sigma hyperon, Sigma(1385)^+, produced in p+p -> Sigma^+ + K^+ + n at 3.5 GeV beam energy. The extracted data allow to study in detail the invariant mass distribution of the Sigma(1385)^+. The mass distribution is well described by a relativistic Breit-Wigner function with a maximum at m_0 = 1383.2 +- 0.9 MeV/c^2 and a width of 40.2 +- 2.1 MeV/c^2. The exclusive production cross-section comes out to be 22.27 +-...
Source: http://arxiv.org/abs/1109.6806v1

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3 3.0

$Medium effects in proton-induced $K^{0}$ production at 3.5 GeV$

Medium effects in proton-induced $K^{0}$ production at 3.5 GeV

Jun 30, 2018 06/18

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We present the analysis of the inclusive $K^{0}$ production in p+p and p+Nb collisions measured with the HADES detector at a beam kinetic energy of 3.5 GeV. Data are compared to the GiBUU transport model. The data suggest the presence of a repulsive momentum-dependent kaon potential as predicted by the Chiral Perturbation Theory (ChPT). For the kaon at rest and at normal nuclear density, the ChPT potential amounts to $\approx 35$ MeV. A detailed tuning of the kaon production cross sections...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1404.7011

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55 55

Single and double pion production in np collisions at 1.25 GeV with HADES

Sep 18, 2013 09/13

by The HADES Collaboration; A. K. Kurilkin; G. Agakishiev; A. Balanda; D. Belver; A. Belyaev; A. Blanco; M. Böhmer; J. L. Boyard; P. Cabanelas; E. Castro; S. Chernenko; J. D\'\iaz; A. Dybczak; E. Epple; L. Fabbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzón; A. Gil; M. Golubeva; D. González-D\'\iaz; F. Guber; T. Hennino; R. Holzmann; P. Huck; A. Ierusalimov; I. Iori; A. Ivashkin; M. Jurkovic; B. Kämpfer; T. Karavicheva; I. Koenig; W. Koenig; B. W....

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The preliminary results on charged pion production in np collisions at an incident beam energy of 1.25 GeV measured with HADES are presented. The np reactions were isolated in dp collisions at 1.25 GeV/u using the Forward Wall hodoscope, which allowed to register spectator protons. The results for np -> pppi-, np -> nppi+pi- and np -> dpi+pi- channels are compared with OPE calculations. A reasonable agreement between experimental results and the predictions of the OPE+OBE model is...
Source: http://arxiv.org/abs/1102.1843v2

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56 56

Cross section in deuteron-proton elastic scattering at 1.25 GeV/u

Sep 18, 2013 09/13

by HADES Collaboration; P. K. Kurilkin; G. Agakishiev; A. Balanda; D. Belver; A. Belyaev; A. Blanco; M. Böhmer; J. L. Boyard; P. Cabanelas; E. Castro; S. Chernenko; J. Díaz; A. Dybczak; E. Epple; L. Fabbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzón; A. Gil; M. Golubeva; D. González-Díaz; F. Guber; T. Hennino; R. Holzmann; P. Huck; A. Ierusalimov; I. Iori; A. Ivashkin; M. Jurkovic; B. Kämpfer; T. Karavicheva; I. Koenig; W. Koenig; B. W. Kolb;...

eye 56

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First results of the differential cross section in dp elastic scattering at 1.25 GeV/u measured with the HADES over a large angular range are reported. The obtained data corresponds to large transverse momenta, where a high sensitivity to the two-nucleon and three-nucleon short-range correlations is expected.
Source: http://arxiv.org/abs/1102.1610v4

Arxiv.org

20 20

Subthreshold Xi- Production in Collisions of p(3.5 GeV)+Nb

Jun 26, 2018 06/18

by G. Agakishiev; O. Arnold; A. Balanda; D. Belver; A. V. Belyaev; J. C. Berger-Chen; A. Blanco; M. Böhmer; J. L. Boyard; P. Cabanelas; S. Chernenko; A. Dybczak; E. Epple; L. Fabbietti; O. V. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzon; R. Gernhäuser; K. Göbel; M. Golubeva; D. Gonzalez-Diaz; F. Guber; M. Gumberidze; T. Heinz; T. Hennino; R. Holzmann; A. Ierusalimov; I. Iori; A. Ivashkin; M. Jurkovic; B. Kämpfer; T. Karavicheva; I. Koenig; W. Koenig; B....

eye 20

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Results on the production of the double-strange cascade hyperon $\mathrm{\Xi^-}$ are reported for collisions of p\,(3.5~GeV)\,+\,Nb, studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18 at GSI Helmholtzzentrum for Heavy-Ion Research, Darmstadt. For the first time, subthreshold $\mathrm{\Xi^-}$ production is observed in proton-nucleus interactions. Assuming a $\mathrm{\Xi^-}$ phase-space distribution similar to that of $\mathrm{\Lambda}$ hyperons, the production probability...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1501.03894

Arxiv.org

39 39

Inclusive dielectron spectra in p+p collisions at 3.5 GeV

Sep 24, 2013 09/13

by G. Agakishiev; A. Balanda; D. Belver; A. Belyaev; A. Blanco; M. Böhmer; J. L. Boyard; P. Cabanelas; E. Castro; J. C. Chen; S. Chernenko; T. Christ; M. Destefanis; F. Dohrmann; A. Dybczak; E. Epple; L. Fabbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzón; R. Gernhäuser; C. Gilardi; M. Golubeva; D. González-Díaz; F. Guber; M. Gumberidze; T. Heinz; T. Hennino; R. Holzmann; I. Iori; A. Ivashkin; M. Jurkovic; B. Kämpfer; K. Kanaki; T. Karavicheva;...

eye 39

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We present the inclusive invariant-mass, transverse momentum and rapidity distributions of dielectrons (e$^{+}$e$^{-}$ pairs) in p+p interactions at 3.5 GeV beam kinetic energy. In the vector-meson mass region, a distinct peak corresponding to direct $\omega$ decays is reconstructed with 2% mass resolution. The data is compared to predictions from three model calculations. Due to the large acceptance of the HADES apparatus for $e^{+}e^{-}$ invariant masses above 0.2 GeV/$c^{2}$ and for...
Source: http://arxiv.org/abs/1112.3607v1

Arxiv.org

9 9.0

$The $\bf{\Lambda p}$ interaction studied via femtoscopy in p + Nb reactions at $\mathbf{\sqrt{s_{NN}}=3.18} ~\mathrm{\bf{GeV}}$$

The $\bf{\Lambda p}$ interaction studied via femtoscopy in p + Nb reactions at $\mathbf{\sqrt{s_{NN}}=3.18} ~\mathrm{\bf{GeV}}$

Jun 29, 2018 06/18

by J. Adamczewski-Musch; G. Agakishiev; O. Arnold; E. T. Atomssa; C. Behnke; J. C. Berger-Chen; J. Biernat; A. Blanco; C. Blume; M. Böhmer; P. Bordalo; V. Wagner; C. Wendisch; J. Wirth; J. Wüstenfeld; Y. Zanevsky; P. Zumbruch; S. Chernenko; C. Deveaux; A. Dybczak; E. Epple; L. Fabbietti; O. Fateev; P. Fonte; C. Franco; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzon; K. Gill; M. Golubeva; F. Guber; M. Gumberidze; S. Harabasz; T. Hennino; S. Hlavac; C. Höhne; R. Holzmann; A. Ierusalimov; A....

eye 9

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We report on the first measurement of $p\Lambda$ and $pp$ correlations via the femtoscopy method in p+Nb reactions at $\mathrm{\sqrt{s_{NN}}=3.18} ~\mathrm{GeV}$, studied with the High Acceptance Di-Electron Spectrometer (HADES). By comparing the experimental correlation function to model calculations, a source size for $pp$ pairs of $r_{0,pp}=2.02 \pm 0.01(\mathrm{stat})^{+0.11}_{-0.12} (\mathrm{sys}) ~\mathrm{fm}$ and a slightly smaller value for $p\Lambda$ of $r_{0,\Lambda p}=1.62 \pm...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1602.08880

Arxiv.org

52 52

Lambda-p femtoscopy in collisions of Ar+KCl at 1.76 AGeV

Sep 22, 2013 09/13

by G. Agakishiev; A. Balanda; R. Bassini; D. Belver; A. V. Belyaev; A. Blanco; M. Böhmer; J. L. Boyard; P. Braun-Munzinger; P. Cabanelas; E. Castro; S. Chernenko; T. Christ; M. Destefanis; J. Díaz; F. Dohrmann; A. Dybczak; T. Eberl; L. Fabbietti; O. V. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzón; R. Gernhäuser; A. Gil; C. Gilardi; M. Golubeva; D. González-Díaz; F. Guber; T. Hennino; R. Holzmann; I. Iori; A. Ivashkin; M. Jurkovic; B. Kämpfer; K....

eye 52

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Results on $\Lambda$p femtoscopy are reported at the lowest energy so far. At a beam energy of 1.76A~GeV, the reaction Ar+KCl was studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. A high-statistics and high-purity $\Lambda$ sample was collected, allowing for the investigation of $\Lambda$ p correlations at small relative momenta. The experimental correlation function is compared to corresponding model calculations allowing the determination of the space-time extent...
Source: http://arxiv.org/abs/1004.2328v1

Arxiv.org

8 8.0

$Inclusive {\Lambda} production in proton-proton collisions at 3.5 GeV$

Inclusive {\Lambda} production in proton-proton collisions at 3.5 GeV

Jun 29, 2018 06/18

by J. Adamczewski-Musch; G. Agakishiev; O. Arnold; E. T. Atomssa; C. Behnke; J. C. Berger-Chen; J. Biernat; A. Blanco; C. Blume; M. Böhmer; P. Bordalo; P. Tlusty; M. Traxler; H. Tsertos; T. Vasiliev; V. Wagner; C. Wendisch; J. Wirth; Y. Zanevsky; P. Zumbruch; S. Chernenko; C. Deveaux; J. Dreyer; A. Dybczak; E. Epple; L. Fabbietti; O. Fateev; P. Fonte; C. Franco; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzón; K. Gill; M. Golubeva; F. Guber; M. Gumberidze; S. Harabasz; T. Hennino; S. Hlavac;...

eye 8

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The inclusive production of {\Lambda} hyperons in proton-proton collisions at $\sqrt{s}$ = 3.18 GeV was measured with HADES at the GSI Helmholtzzentrum f\"ur Schwerionenforschung in Darmstadt. The experimental data are compared to a data-based model for individual exclusive {\Lambda} production channels in the same reaction. The contributions of intermediate resonances such as {\Sigma}(1385), {\Delta}++ or N* are considered in detail. In particular, the result of a partial wave analysis is...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1611.01040

Arxiv.org

15 15

$Study of the quasi-free $np \to np \pi^+\pi^-$ reaction with a deuterium beam at 1.25 GeV/nucleon$

Study of the quasi-free $np \to np \pi^+\pi^-$ reaction with a deuterium beam at 1.25 GeV/nucleon

Jun 27, 2018 06/18

by G. Agakishiev; A. Balanda; D. Belver; A. V. Belyaev; A. Blanco; M. Böhmer; J. L. Boyard; P. Braun-Munzinger; P. Cabanelas; E. Castro; S. Chernenko; T. Wojcik; J. Wüstenfeld; S. Yurevich; Y. Zanevsky; P. Zhou; T. Christ; M. Destefanis; J. Díaz; F. Dohrmann; A. Dybczak; L. Fabbietti; O. V. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzón; R. Gernhäuser; A. Gil; C. Gilardi; K. Göbel; M. Golubeva; D. González-Díaz; F. Guber; M. Gumberidze; T. Hennino; R....

eye 15

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The tagged quasi-free $np \to np\pi^+\pi^-$ reaction has been studied experimentally with the High Acceptance Di-Electron Spectrometer (HADES) at GSI at a deuteron incident beam energy of 1.25 GeV/nucleon ($\sqrt s \sim$ 2.42 GeV/c for the quasi-free collision). For the first time, differential distributions for $\pi^{+}\pi^{-}$ production in $np$ collisions have been collected in the region corresponding to the large transverse momenta of the secondary particles. The invariant mass and angular...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1503.04013

Arxiv.org

15 15

Statistical model analysis of hadron yields in proton-nucleus and heavy-ion collisions at SIS 18 energies

Jun 28, 2018 06/18

by G. Agakishiev; O. Arnold; A. Balanda; D. Belver; A. Belyaev; J. C. Berger-Chen; A. Blanco; M. Böhmer; J. L. Boyard; P. Cabanelas; E. Castro; R. Trebacz; H. Tsertos; T. Vasiliev; V. Wagner; M. Weber; C. Wendisch; M. Wisniowski; J. Wüstenfeld; S. Yurevich; Y. Zanevsky; S. Chernenko; M. Destefanis; F. Dohrmann; A. Dybczak; E. Epple; L. Fabbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzon; R. Gernhäuser; C. Gilardi; K. Göbel; M. Golubeva; D....

eye 15

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The HADES data from p+Nb collisions at center of mass energy of $\sqrt{s_{NN}}$= 3.2 GeV are analyzed by employing a statistical model. Accounting for the identified hadrons $\pi^0$, $\eta$, $\Lambda$, $K^{0}_{s}$, $\omega$ allows a surprisingly good description of their abundances with parameters $T_{chem}=(99\pm11)$ MeV and $\mu_{b}=(619\pm34)$ MeV, which fits well in the chemical freeze-out systematics found in heavy-ion collisions. In supplement we reanalyze our previous HADES data from...
Topics: High Energy Physics - Experiment, Nuclear Experiment, Nuclear Theory
Source: http://arxiv.org/abs/1512.07070

Arxiv.org

66 66

Hyperon production in Ar+KCl collisions at 1.76A GeV

Sep 19, 2013 09/13

by G. Agakishiev; A. Balanda; B. Bannier; R. Bassini; D. Belver; A. Belyaev; A. Blanco; M. Böhmer; J. L. Boyard; P. Cabanelas; E. Castro; S. Chernenko; T. Christ; M. Destefanis; J. Diaz; F. Dohrmann; A. Dybczak; T. Eberl; E. Epple; L. Fabbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Froehlich; T. Galatyuk; J. A. Garzon; R. Gernhaeuser; A. Gil; C. Gilardi; M. Golubeva; D. Gonzalez-Diaz; F. Guber; M. Gumberidze; M. Heilmann; T. Heinz; T. Hennino; R. Holzmann; P. Huck; I. Iori; A....

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We present transverse momentum spectra, rapidity distribution and multiplicity of Lambda-hyperons measured with the HADES spectrometer in the reaction Ar(1.76A GeV)+KCl. The yield of Xi- is calculated from our previously reported Xi-/(Lambda+Sigma0) ratio and compared to other strange particle multiplicities. Employing a strangeness balance equation the multiplicities of the yet unmeasured charged Sigma hyperons can be estimated. Finally a statistical hadronization model is used to fit the...
Source: http://arxiv.org/abs/1010.1675v3

Arxiv.org

56 56

In-Medium Effects on K0 Mesons in Relativistic Heavy-Ion Collisions

Sep 22, 2013 09/13

by G. Agakishiev; A. Balanda; B. Bannier; R. Bassini; D. Belver; A. V. Belyaev; A. Blanco; M. Böhmer; J. L. Boyard; P. Cabanelas; E. Castro; S. Chernenko; T. Christ; M. Destefanis; J. Díaz; F. Dohrmann; A. Dybczak; T. Eberl; E. Epple; L. Fabbietti; O. V. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzón; R. Gernhäuser; A. Gil; C. Gilardi; M. Golubeva; D. González-Díaz; F. Guber; M. Heilmann; T. Heinz; T. Hennino; R. Holzmann; A. Ierusalimov; I. Iori; A....

eye 56

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We present the transverse momentum spectra and rapidity distributions of $\pi^{-}$ and K$^0_S$ in Ar+KCl reactions at a beam kinetic energy of 1.756 A GeV measured with the spectrometer HADES. The reconstructed K$^0_S$ sample is characterized by good event statistics for a wide range in momentum and rapidity. We compare the experimental $\pi^{-}$ and K$^0_S$ distributions to predictions by the IQMD model. The model calculations show that K$^0_S$ at low tranverse momenta constitute a...
Source: http://arxiv.org/abs/1004.3881v2

Arxiv.org

98 98

The High-Acceptance Dielectron Spectrometer HADES

Sep 21, 2013 09/13

by The HADES Collaboration; G. Agakishiev; A. Balanda; B. Bannier; R. Bassini; D. Belver; A. V. Belyaev; A. Blanco; M. Boehmer; J. L. Boyard; P. Braun-Munzinger; P. Cabanelas; E. Castro; S. Chernenko; T. Christ; M. Destefanis; J. Diaz; F. Dohrmann; A. Dybczak; T. Eberl; W. Enghardt; L. Fabbietti; O. V. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Froehlich; T. Galatyuk; J. A. Garzon; R. Gernhaeuser; A. Gil; C. Gilardi; M. Golubeva; D. Gonzalez-Diaz; F. Guber; M. Heilmann; T. Heinz; T. Hennino;...

eye 98

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HADES is a versatile magnetic spectrometer aimed at studying dielectron production in pion, proton and heavy-ion induced collisions. Its main features include a ring imaging gas Cherenkov detector for electron-hadron discrimination, a tracking system consisting of a set of 6 superconducting coils producing a toroidal field and drift chambers and a multiplicity and electron trigger array for additional electron-hadron discrimination and event characterization. A two-stage trigger system enhances...
Source: http://arxiv.org/abs/0902.3478v2

Arxiv.org

58 58

Future perspectives at SIS-100 with HADES-at-FAIR

Sep 22, 2013 09/13

by The HADES Collaboration; I. Froehlich; G. Agakishiev; A. Balanda; G. Bellia; D. Belver; A. Belyaev; A. Blanco; M. Boehmer; J. L. Boyard; P. Braun-Munzinger; P. Cabanelas; E. Castro; S. Chernenko; T. Christ; M. Destefanis; J. Diaz; F. Dohrmann; A. Dybczak; L. Fabbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; T. Galatyuk; J. A. Garzon; R. Gernhaeuser; A. Gil; C. Gilardi; M. Golubeva; D. Gonzalez-Diaz; E. Grosse; F. Guber; M. Heilmann; T. Hennino; R. Holzmann; A. Ierusalimov; I. Iori; A....

eye 58

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Currently, the HADES spectrometer undergoes un upgrade program to be prepared for measurements at the upcoming SIS-100 synchrotron at FAIR. We describe the current status of the HADES di-electron measurements at the SIS-18 and our future plans for SIS-100.
Source: http://arxiv.org/abs/0906.0091v2

Arxiv.org

60 60

Charged pion production in C+C and Ar+KCl collisions measured with HADES

Sep 22, 2013 09/13

by The HADES Collaboration; P. Tlusty; G. Agakishiev; A. Balanda; G. Bellia; D. Belver; A. Belyaev; A. Blanco; M. Boehmer; J. L. Boyard; P. Braun-Munzinger; P. Cabanelas; E. Castro; S. Chernenko; T. Christ; M. Destefanis; J. Diaz; F. Dohrmann; A. Dybczak; L. Fabbietti; O. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Froehlich; T. Galatyuk; J. A. Garzon; R. Gernhaeuser; A. Gil; C. Gilardi; M. Golubeva; D. Gonzalez-Diaz; E. Grosse; F. Guber; M. Heilmann; T. Hennino; R. Holzmann; A. Ierusalimov;...

eye 60

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Results of a study of charged pion production in 12C+12C collisions at incident beam energies of 1A GeV and 2A GeV, and 40Ar+natKCl at 1.76AGeV, using the spectrometer HADES at GSI, are presented. We have performed a measurement of the transverse momentum distributions of pi+- mesons covering a fairly large rapidity interval, in case of the C+C collision system for the first time. The yields, transverse mass and angular distributions are compared with a transport model as well as with existing...
Source: http://arxiv.org/abs/0906.2309v1

Arxiv.org

42 42

Phi decay: a relevant source for K- production at SIS energies?

Sep 21, 2013 09/13

by The HADES Collaboration; G. Agakishiev; A. Balanda; B. Bannier; R. Bassini; D. Belver; A. V. Belyaev; A. Blanco; M. Boehmer; J. L. Boyard; P. Braun-Munzinger; P. Cabanelas; E. Castro; S. Chernenko; T. Christ; M. Destefanis; J. Diaz; F. Dohrmann; A. Dybczak; T. Eberl; W. Enghardt; L. Fabbietti; O. V. Fateev; P. Finocchiaro; P. Fonte; J. Friese; I. Froehlich; T. Galatyuk; J. A. Garzon; R. Gernhaeuser; A. Gil1; C. Gilardi; M. Golubeva; D. Gonzalez-Diaz; F. Guber; M. Heilmann; T. Heinz; T. Hennino;...

eye 42

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We present phase space distributions and multiplicities of K+, K- and phi mesons produced in Ar+KCl reactions at a kinetic beam energy of 1.756 AGeV and measured with the HADES spectrometer. The inverse slope parameters and yields of kaons supplement the systematics of previous measurements. The percentage of K- mesons coming fromphi decay is found to be 18+- 7%.
Source: http://arxiv.org/abs/0902.3487v1

Arxiv.org

8 8.0

$Deep sub-threshold {\phi} production and implications for the K+/K- freeze-out in Au+Au collisions$

Deep sub-threshold {\phi} production and implications for the K+/K- freeze-out in Au+Au collisions

Jun 30, 2018 06/18

by J. Adamczewski-Musch; O. Arnold; C. Behnke; A. Belounnas; A. Belyaev; J. C. Berger-Chen; J. Biernat; A. Blanco; C. Blume; M. Böhmer; P. Bordalo; C. Sturm; O. Svoboda; M. Szala; P. Tlusty; M. Traxler; H. Tsertos; E. Usenko; V. Wagner; C. Wendisch; M. G. Wiebusch; S. Chernenko; J. Wirth; Y. Zanevsky; P. Zumbruch; L. Chlad; C. Deveaux; J. Dreyer; A. Dybczak; E. Epple; L. Fabbietti; O. Fateev; P. Filip; P. Fonte; C. Franco; J. Friese; I. Fröhlich; T. Galatyuk; J. A. Garzon; R. Gernhäuser; M....

eye 8

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We present first data on charged kaons and {\phi} mesons in Au+Au collisions at a kinetic beam energy of 1.23A GeV. As observed already at slightly higher beam energies, we find significantly different slopes for the K+ and K- transverse-mass spectra, and no significant increase of the the K-/K+ multiplicity ratio with increasing centrality of the collision. The {\phi}/K- multiplicity ratio is found to be surprisingly high with a value of 0.52 $\pm$ 0.16 and shows no dependence on the...
Topics: Nuclear Experiment, High Energy Physics - Experiment
Source: http://arxiv.org/abs/1703.08418

Arxiv.org

59 59

Study of dielectron production in C+C collisions at 1 AGeV

Sep 17, 2013 09/13

by HADES Collaboration; G. Agakishiev; C. Agodi; H. Alvarez Pol; A. Balanda; R. Bassini; G. Bellia; D. Belver; A. Belyaev; A. Blanco; M. Boehmer; A. Bortolotti; J. L. Boyard; P. Braun-Munzinger; P. Cabanelas; E. Castro; T. Christ; M. Destefanis; J. Diaz; F. Dohrmann; A. Dybczak; T. Eberl; L. Fabbietti; P. Finocchiaro; P. Fonte; J. Friese; I. Froehlich; T. Galatyuk; J. A. Garzon; R. Gernhaeuser; A. Gil; C. Gilardi; M. Golubeva; D. Gonzalez Diaz; E. Grosse; F. Guber; M. Heilmann; T. Hennino; R....

eye 59

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The emission of e+e- pairs from C+C collisions at an incident energy of 1 GeV per nucleon has been investigated. The measured production probabilities, spanning from the pi0-Dalitz to the rho/omega! invariant-mass region, display a strong excess above the cocktail of standard hadronic sources. The bombarding-energy dependence of this excess is found to scale like pion production, rather than like eta production. The data are in good agreement with results obtained in the former DLS experiment.
Source: http://arxiv.org/abs/0711.4281v3

Arxiv.org

35 35

Measurement of charged pions in 12C + 12C collisions at 1A GeV and 2A GeV with HADES

Sep 21, 2013 09/13

by The HADES Collaboration; G. Agakishiev; C. Agodi; A. Balanda; G. Bellia; D. Belver; A. Belyaev; J. Bielcik; A. Blanco; A. Bortolotti; J. L. Boyard; P. Braun-Munzinger; P. Cabanelas; S. Chernenko; T. Christ; R. Coniglione; M. Destefanis; J. Diaz; F. Dohrmann; I. Duran; A. Dybczak; T. Eberl; L. Fabbietti; O. Fateev; R. Ferreira-Marques; P. Finocchiaro; P. Fonte; J. Friese; I. Froehlich; T. Galatyuk; J. A. Garzon; R. Gernhaeuser; A. Gil; C. Gilardi; M. Golubeva; D. Gonzalez-Diaz; E. Grosse; F....

eye 35

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We present the results of a study of charged pion production in 12C + 12C collisions at incident beam energies of 1A GeV and 2A GeV using the HADES spectrometer at GSI. The main emphasis of the HADES program is on the dielectron signal from the early phase of the collision. Here, however, we discuss the data with respect to the emission of charged hadrons, specifically the production of pi+- mesons, which are related to neutral pions representing a dominant contribution to the dielectron yield....
Source: http://arxiv.org/abs/0902.4377v2

Arxiv.org

21 21

The transverse momentum dependence of charged kaon Bose-Einstein correlations in the SELEX experiment

Jun 26, 2018 06/18

by SELEX Collaboration; G. A. Nigmatkulov; A. K. Ponosov; U. Akgun; G. Alkhazov; J. Amaro-Reyes; A. Asratyan; A. G. Atamantchouk; A. S. Ayan; M. Y. Balatz; A. Blanco-Covarrubias; A. A. Vorobyov; K. Vorwalter; J. You; R. Zukanovich-Funchal; N. F. Bondar; P. S. Cooper; L. J. Dauwe; G. V. Davidenko; U. Dersch; A. G. Dolgolenko; G. B. Dzyubenko; R. Edelstein; L. Emediato; A. M. F. Endler; J. Engelfried; I. Eschrich; C. O. Escobar; N. Estrada; A. V. Evdokimov; I. S. Filimonov; A. Flores-Castillo; F. G....

eye 21

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We report on the measurement of the one-dimensional charged kaon correlation functions using 600~GeV/{\it c} $\Sigma^-$, $\pi^-$ and 540~GeV/{\it c} $p$ beams from the SELEX~(E781) experiment at the Fermilab Tevatron. $K^{\pm}K^{\pm}$ correlation functions are studied for three transverse pair momentum, $k_T$, ranges and parameterized by a Gaussian form. The emission source radii, $R$, and the correlation strength, $\lambda$, are extracted. The analysis shows a decrease of the source radii with...
Topics: Nuclear Experiment, High Energy Physics - Experiment
Source: http://arxiv.org/abs/1501.04316

Arxiv.org

11 11

$Search for photons with energies above 10$^{18}$ eV using the hybrid detector of the Pierre Auger Observatory$

Search for photons with energies above 10$^{18}$ eV using the hybrid detector of the Pierre Auger Observatory

Jun 29, 2018 06/18

by The Pierre Auger Collaboration; A. Aab; P. Abreu; M. Aglietta; I. Al Samarai; I. F. M. Albuquerque; I. Allekotte; A. Almela; J. Alvarez Castillo; J. Alvarez-Muñiz; G. A. Anastasi; M. Erdmann; M. Erfani; C. O. Escobar; J. Espadanal; A. Etchegoyen; H. Falcke; G. Farrar; A. C. Fauth; N. Fazzini; B. Fick; L. Anchordoqui; J. M. Figueira; A. Filipčič; O. Fratu; M. M. Freire; T. Fujii; A. Fuster; R. Gaior; B. García; D. Garcia-Pinto; F. Gaté; B. Andrada; H. Gemmeke; A. Gherghel-Lascu; P. L. Ghia;...

eye 11

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A search for ultra-high energy photons with energies above 1 EeV is performed using nine years of data collected by the Pierre Auger Observatory in hybrid operation mode. An unprecedented separation power between photon and hadron primaries is achieved by combining measurements of the longitudinal air-shower development with the particle content at ground measured by the fluorescence and surface detectors, respectively. Only three photon candidates at energies 1 - 2 EeV are found, which is...
Topics: Astrophysics, High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Source: http://arxiv.org/abs/1612.01517

Arxiv.org

11 11

A targeted search for point sources of EeV photons with the Pierre Auger Observatory

Jun 29, 2018 06/18

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Simultaneous measurements of air showers with the fluorescence and surface detectors of the Pierre Auger Observatory allow a sensitive search for EeV photon point sources. Several Galactic and extragalactic candidate objects are grouped in classes to reduce the statistical penalty of many trials from that of a blind search and are analyzed for a significant excess above the background expectation. The presented search does not find any evidence for photon emission at candidate sources, and...
Topics: Astrophysics, High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1612.04155

Arxiv.org

12 12

Ultrahigh-energy neutrino follow-up of Gravitational Wave events GW150914 and GW151226 with the Pierre Auger Observatory

Jun 29, 2018 06/18

by The Pierre Auger Collaboration; A. Aab; P. Abreu; M. Aglietta; I. Al Samarai; I. F. M. Albuquerque; I. Allekotte; A. Almela; J. Alvarez Castillo; J. Alvarez-Muñiz; M. Ambrosio; A. Dundovic; J. Ebr; R. Engel; M. Erdmann; M. Erfani; C. O. Escobar; J. Espadanal; A. Etchegoyen; H. Falcke; K. Fang; G. A. Anastasi; G. Farrar; A. C. Fauth; N. Fazzini; B. Fick; J. M. Figueira; A. Filipčič; O. Fratu; M. M. Freire; T. Fujii; A. Fuster; L. Anchordoqui; R. Gaior; B. García; D. Garcia-Pinto; F. Gaté;...

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On September 14, 2015 the Advanced LIGO detectors observed their first gravitational-wave (GW) transient GW150914. This was followed by a second GW event observed on December 26, 2015. Both events were inferred to have arisen from the merger of black holes in binary systems. Such a system may emit neutrinos if there are magnetic fields and disk debris remaining from the formation of the two black holes. With the surface detector array of the Pierre Auger Observatory we can search for neutrinos...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1608.07378

Arxiv.org

13 13

Calibration of the Logarithmic-Periodic Dipole Antenna (LPDA) Radio Stations at the Pierre Auger Observatory using an Octocopter

Jun 30, 2018 06/18

by The Pierre Auger Collaboration; A. Aab; P. Abreu; M. Aglietta; I. Al Samarai; I. F. M. Albuquerque; I. Allekotte; A. Almela; J. Alvarez Castillo; J. Alvarez-Muñiz; G. A. Anastasi; A. Dundovic; J. Ebr; R. Engel; M. Erdmann; M. Erfani; C. O. Escobar; J. Espadanal; A. Etchegoyen; H. Falcke; G. Farrar; L. Anchordoqui; A. C. Fauth; N. Fazzini; F. Fenu; B. Fick; J. M. Figueira; A. Filipčič; O. Fratu; M. M. Freire; T. Fujii; A. Fuster; B. Andrada; R. Gaior; B. García; D. Garcia-Pinto; F. Gaté; H....

eye 13

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An in-situ calibration of a logarithmic periodic dipole antenna with a frequency coverage of 30 MHz to 80 MHz is performed. Such antennas are part of a radio station system used for detection of cosmic ray induced air showers at the Engineering Radio Array of the Pierre Auger Observatory, the so-called Auger Engineering Radio Array (AERA). The directional and frequency characteristics of the broadband antenna are investigated using a remotely piloted aircraft (RPA) carrying a small transmitting...
Topics: High Energy Astrophysical Phenomena, Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1702.01392

Arxiv.org

6 6.0

Search for ultrarelativistic magnetic monopoles with the Pierre Auger Observatory

Jun 29, 2018 06/18

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We present a search for ultra-relativistic magnetic monopoles with the Pierre Auger Observatory. Such particles, possibly a relic of phase transitions in the early universe, would deposit a large amount of energy along their path through the atmosphere, comparable to that of ultrahigh-energy cosmic rays (UHECRs). The air shower profile of a magnetic monopole can be effectively distinguished by the fluorescence detector from that of standard UHECRs. No candidate was found in the data collected...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1609.04451

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