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57 57

$Measurements of Dihadron Correlations Relative to the Event Plane in Au+Au Collisions at $\sqrt{s_{NN}}=200$ GeV$

Measurements of Dihadron Correlations Relative to the Event Plane in Au+Au Collisions at $\sqrt{s_{NN}}=200$ GeV

Sep 19, 2013 09/13

by H. Agakishiev; M. M. Aggarwal; Z. Ahammed; A. V. Alakhverdyants; I. Alekseev; J. Alford; B. D. Anderson; C. D. Anson; D. Arkhipkin; G. S. Averichev; J. Balewski; D. R. Beavis; N. K. Behera; R. Bellwied; M. J. Betancourt; R. R. Betts; A. Bhasin; A. K. Bhati; H. Bichsel; J. Bielcik; J. Bielcikova; B. Biritz; L. C. Bland; W. Borowski; J. Bouchet; E. Braidot; A. V. Brandin; A. Bridgeman; S. G. Brovko; E. Bruna; S. Bueltmann; I. Bunzarov; T. P. Burton; X. Z. Cai; H. Caines; M. Calderón de la Barca...

eye 57

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Dihadron azimuthal correlations containing a high transverse momentum ($\pt$) trigger particle are sensitive to the properties of the nuclear medium created at RHIC through the strong interactions occurring between the traversing parton and the medium, i.e. jet-quenching. Previous measurements revealed a strong modification to dihadron azimuthal correlations in Au+Au collisions with respect to \pp\ and \dAu\ collisions. The modification increases with the collision centrality, suggesting a...
Source: http://arxiv.org/abs/1010.0690v2

Arxiv.org

176 176

An Experimental Exploration of the QCD Phase Diagram: The Search for the Critical Point and the Onset of De-confinement

Sep 17, 2013 09/13

by STAR Collaboration; M. M. Aggarwal; Z. Ahammed; A. V. Alakhverdyants; I. Alekseev; B. D. Anderson; D. Arkhipkin; G. S. Averichev; J. Balewski; L. S. Barnby; S. Baumgart; D. R. Beavis; R. Bellwied; M. J. Betancourt; R. R. Betts; A. Bhasin; A. K. Bhati; H. Bichsel; J. Bielcik; J. Bielcikova; B. Biritz; L. C. Bland; B. E. Bonner; J. Bouchet; E. Braidot; A. V. Brandin; A. Bridgeman; E. Bruna; S. Bueltmann; I. Bunzarov; T. P. Burton; X. Z. Cai; H. Caines; M. CalderóndelaBarcaSánchez; O. Catu; D....

eye 176

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The QCD phase diagram lies at the heart of what the RHIC Physics Program is all about. While RHIC has been operating very successfully at or close to its maximum energy for almost a decade, it has become clear that this collider can also be operated at lower energies down to 5 GeV without extensive upgrades. An exploration of the full region of beam energies available at the RHIC facility is imperative. The STAR detector, due to its large uniform acceptance and excellent particle identification...
Source: http://arxiv.org/abs/1007.2613v1

Arxiv.org

42 42

$Directed and elliptic flow of charged particles in Cu+Cu collisions at $\sqrt{\bm {s_{NN}}} =$ 22.4 GeV$

Directed and elliptic flow of charged particles in Cu+Cu collisions at $\sqrt{\bm {s_{NN}}} =$ 22.4 GeV

Sep 23, 2013 09/13

by G. Agakishiev; M. M. Aggarwal; Z. Ahammed; A. V. Alakhverdyants; I. Alekseev; J. Alford; B. D. Anderson; C. D. Anson; D. Arkhipkin; G. S. Averichev; J. Balewski; D. R. Beavis; N. K. Behera; R. Bellwied; M. J. Betancourt; R. R. Betts; A. Bhasin; A. K. Bhati; H. Bichsel; J. Bielcik; J. Bielcikova; L. C. Bland; I. G. Bordyuzhin; W. Borowski; J. Bouchet; E. Braidot; A. V. Brandin; A. Bridgeman; S. G. Brovko; E. Bruna; S. Bueltmann; I. Bunzarov; T. P. Burton; X. Z. Cai; H. Caines; M. Calderón de la...

eye 42

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This paper reports results for directed flow $v_{1}$ and elliptic flow $v_{2}$ of charged particles in Cu+Cu collisions at $\sqrt{s_{NN}}=$ 22.4 GeV at the Relativistic Heavy Ion Collider. The measurements are for the 0-60% most central collisions, using charged particles observed in the STAR detector. Our measurements extend to 22.4 GeV Cu+Cu collisions the prior observation that $v_1$ is independent of the system size at 62.4 and 200 GeV, and also extend the scaling of $v_1$ with $\eta/y_{\rm...
Source: http://arxiv.org/abs/1109.5446v2

Arxiv.org

65 65

Longitudinal and transverse spin asymmetries for inclusive jet production at mid-rapidity in polarized p+p collisions at sqrt{s}=200 GeV

Sep 20, 2013 09/13

by The STAR Collaboration; L. Adamczyk; G. Agakishiev; M. M. Aggarwal; Z. Ahammed; A. V. Alakhverdyants; I. Alekseev; J. Alford; B. D. Anderson; C. D. Anson; D. Arkhipkin; E. Aschenauer; G. S. Averichev; J. Balewski; A. Banerjee; Z. Barnovska; D. R. Beavis; R. Bellwied; M. J. Betancourt; R. R. Betts; A. Bhasin; A. K. Bhati; H. Bichsel; J. Bielcik; J. Bielcikova; L. C. Bland; I. G. Bordyuzhin; W. Borowski; J. Bouchet; A. V. Brandin; A. Bridgeman; S. G. Brovko; E. Bruna; S. Bueltmann; I. Bunzarov;...

eye 65

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We report STAR measurements of the longitudinal double-spin asymmetry A_LL, the transverse single-spin asymmetry A_N, and the transverse double-spin asymmetries A_Sigma and A_TT for inclusive jet production at mid-rapidity in polarized p+p collisions at a center-of-mass energy of sqrt{s} = 200 GeV. The data represent integrated luminosities of 7.6 /pb with longitudinal polarization and 1.8 /pb with transverse polarization, with 50-55% beam polarization, and were recorded in 2005 and 2006. No...
Source: http://arxiv.org/abs/1205.2735v1

Arxiv.org

71 71

Studies of di-jet survival and surface emission bias in Au+Au collisions via angular correlations with respect to back-to-back leading hadrons

Sep 18, 2013 09/13

by H. Agakishiev; M. M. Aggarwal; Z. Ahammed; A. V. Alakhverdyants; I. Alekseev; J. Alford; B. D. Anderson; C. D. Anson; D. Arkhipkin; G. S. Averichev; J. Balewski; D. R. Beavis; N. K. Behera; R. Bellwied; M. J. Betancourt; R. R. Betts; A. Bhasin; A. K. Bhati; H. Bichsel; J. Bielcik; J. Bielcikova; B. Biritz; L. C. Bland; I. G. Bordyuzhin; W. Borowski; J. Bouchet; E. Braidot; A. V. Brandin; A. Bridgeman; S. G. Brovko; E. Bruna; S. Bueltmann; I. Bunzarov; T. P. Burton; X. Z. Cai; H. Caines; M....

eye 71

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We report first results from an analysis based on a new multi-hadron correlation technique, exploring jet-medium interactions and di-jet surface emission bias at RHIC. Pairs of back-to-back high transverse momentum hadrons are used for triggers to study associated hadron distributions. In contrast with two- and three-particle correlations with a single trigger with similar kinematic selections, the associated hadron distribution of both trigger sides reveals no modification in either relative...
Source: http://arxiv.org/abs/1102.2669v1

Arxiv.org

48 48

Higher Moments of Net-proton Multiplicity Distributions at RHIC

Sep 22, 2013 09/13

by M. M. Aggarwal; Z. Ahammed; A. V. Alakhverdyants; I. Alekseev; J. Alford; B. D. Anderson; D. Arkhipkin; G. S. Averichev; J. Balewski; L. S. Barnby; S. Baumgart; D. R. Beavis; R. Bellwied; M. J. Betancourt; R. R. Betts; A. Bhasin; A. K. Bhati; H. Bichsel; J. Bielcik; J. Bielcikova; B. Biritz; L. C. Bland; 3 B. E. Bonner; J. Bouchet; E. Braidot; A. V. Brandin; A. Bridgeman; E. Bruna; S. Bueltmann; I. Bunzarov; T. P. Burton; X. Z. Cai; H. Caines; M. Calderón de la Barca Sánchez; O. Catu; D....

eye 48

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We report the first measurements of the kurtosis (\kappa), skewness (S) and variance (\sigma^2) of net-proton multiplicity (N_p - N_pbar) distributions at midrapidity for Au+Au collisions at \sqrt(s_NN) = 19.6, 62.4, and 200 GeV corresponding to baryon chemical potentials (\mu_B) between 200 - 20 MeV. Our measurements of the products \kappa \sigma^2 and S \sigma, which can be related to theoretical calculations sensitive to baryon number susceptibilities and long range correlations, are...
Source: http://arxiv.org/abs/1004.4959v2

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

70 70

$Azimuthal di-hadron correlations in d+Au and Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV from STAR$

Azimuthal di-hadron correlations in d+Au and Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV from STAR

Sep 22, 2013 09/13

by STAR Collaboration; M. M. Aggarwal; Z. Ahammed; A. V. Alakhverdyants; I. Alekseev; J. Alford; B. D. Anderson; Daniel Anson; D. Arkhipkin; G. S. Averichev; J. Balewski; L. S. Barnby; S. Baumgart; D. R. Beavis; R. Bellwied; M. J. Betancourt; R. R. Betts; A. Bhasin; A. K. Bhati; H. Bichsel; J. Bielcik; J. Bielcikova; B. Biritz; L. C. Bland; B. E. Bonner; J. Bouchet; E. Braidot; A. V. Brandin; A. Bridgeman; E. Bruna; S. Bueltmann; I. Bunzarov; T. P. Burton; X. Z. Cai; H. Caines; M. Calderon; O....

eye 70

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Yields, correlation shapes, and mean transverse momenta \pt{} of charged particles associated with intermediate to high-\pt{} trigger particles ($2.5 < \pt < 10$ \GeVc) in d+Au and Au+Au collisions at $\snn=200$ GeV are presented. For associated particles at higher $\pt \gtrsim 2.5$ \GeVc, narrow correlation peaks are seen in d+Au and Au+Au, indicating that the main production mechanism is jet fragmentation. At lower associated particle $\pt < 2$ \GeVc, a large enhancement of the near-...
Source: http://arxiv.org/abs/1004.2377v2

Arxiv.org

6 6.0

Search for ultrarelativistic magnetic monopoles 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;...

eye 6

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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

Arxiv.org

67 67

Pion femtoscopy in p+p collisions at sqrt(s)=200 GeV

Sep 22, 2013 09/13

eye 67

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The STAR Collaboration at RHIC has measured two-pion correlation functions from p+p collisions at sqrt(s)=200 GeV. Spatial scales are extracted via a femtoscopic analysis of the correlations, though this analysis is complicated by the presence of strong non-femtoscopic effects. Our results are put into the context of the world dataset of femtoscopy in hadron-hadron collisions. We present the first direct comparison of femtoscopy in p+p and heavy ion collisions, under identical analysis and...
Source: http://arxiv.org/abs/1004.0925v3

Arxiv.org

86 86

Upsilon cross section in p+p collisions at sqrt(s) = 200 GeV

Sep 22, 2013 09/13

by STAR Collaboration; B. I. Abelev; M. M. Aggarwal; Z. Ahammed; A. V. Alakhverdyants; B. D. Anderson; D. Arkhipkin; G. S. Averichev; J. Balewski; L. S. Barnby; S. Baumgart; D. R. Beavis; R. Bellwied; M. J. Betancourt; R. R. Betts; A. Bhasin; A. K. Bhati; H. Bichsel; J. Bielcik; J. Bielcikova; B. Biritz; L. C. Bland; B. E. Bonner; J. Bouchet; E. Braidot; A. V. Brandin; A. Bridgeman; E. Bruna; S. Bueltmann; I. Bunzarov; T. P. Burton; X. Z. Cai; H. Caines; M. Calderón de la Barca Sánchez; O. Catu;...

eye 86

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We report on a measurement of the Upsilon(1S+2S+3S) -> e+e- cross section at midrapidity in p+p collisions at sqrt(s)=200 GeV. We find the cross section to be 114 +/- 38 (stat.) +23,-24 (syst.) pb. Perturbative QCD calculations at next-to-leading order in the Color Evaporation Model are in agreement with our measurement, while calculations in the Color Singlet Model underestimate it by 2 sigma. Our result is consistent with the trend seen in world data as a function of the center-of-mass...
Source: http://arxiv.org/abs/1001.2745v2

Arxiv.org

69 69

$K*0 production in Cu+Cu and Au+Au collisions at \sqrt{s_NN} = 62.4 GeV and 200 GeV$

K*0 production in Cu+Cu and Au+Au collisions at \sqrt{s_NN} = 62.4 GeV and 200 GeV

Sep 23, 2013 09/13

by M. M. Aggarwal; Z. Ahammed; A. V. Alakhverdyants; I. Alekseev; J. Alford; B. D. Anderson; Daniel Anson; D. Arkhipkin; G. S. Averichev; J. Balewski; L. S. Barnby; S. Baumgart; D. R. Beavis; R. Bellwied; M. J. Betancourt; R. R. Betts; A. Bhasin; A. K. Bhati; H. Bichsel; J. Bielcik; J. Bielcikova; B. Biritz; L. C. Bland; B. E. Bonner; W. Borowski; J. Bouchet; E. Braidot; A. V. Brandin; A. Bridgeman; E. Bruna; S. Bueltmann; I. Bunzarov; T. P. Burton; X. Z. Cai; H. Caines; M. Calderon; O. Catu; D....

eye 69

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We report on K*0 production at mid-rapidity in Au+Au and Cu+Cu collisions at \sqrt{s_{NN}} = 62.4 and 200 GeV collected by the Solenoid Tracker at RHIC (STAR) detector. The K*0 is reconstructed via the hadronic decays K*0 \to K+ pi- and \bar{K*0} \to K-pi+. Transverse momentum, pT, spectra are measured over a range of pT extending from 0.2 GeV/c to 5 GeV/c. The center of mass energy and system size dependence of the rapidity density, dN/dy, and the average transverse momentum, , are presented....
Source: http://arxiv.org/abs/1006.1961v1

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

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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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

eye 12

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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

8 8.0

Azimuthal asymmetry in the risetime of the surface detector signals of the Pierre Auger Observatory

Jun 29, 2018 06/18

by The Pierre Auger Collaboration; A. Aab; P. Abreu; M. Aglietta; E. J. Ahn; I. Al Samarai; I. F. M. Albuquerque; I. Allekotte; P. Allison; A. Almela; J. Alvarez Castillo; M. L. Díaz Castro; F. Diogo; C. Dobrigkeit; J. C. D'Olivo; A. Dorofeev; R. C. dos Anjos; M. T. Dova; A. Dundovic; J. Ebr; R. Engel; J. Alvarez-Muñiz; M. Erdmann; M. Erfani; C. O. Escobar; J. Espadanal; A. Etchegoyen; H. Falcke; K. Fang; G. Farrar; A. C. Fauth; N. Fazzini; M. Ambrosio; A. P. Ferguson; B. Fick; J. M. Figueira;...

eye 8

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The azimuthal asymmetry in the risetime of signals in Auger surface detector stations is a source of information on shower development. The azimuthal asymmetry is due to a combination of the longitudinal evolution of the shower and geometrical effects related to the angles of incidence of the particles into the detectors. The magnitude of the effect depends upon the zenith angle and state of development of the shower and thus provides a novel observable, $(\sec \theta)_\mathrm{max}$, sensitive...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1604.00978

Arxiv.org

18 18

Evidence for a mixed mass composition at the `ankle' in the cosmic-ray spectrum

Jun 29, 2018 06/18

by The Pierre Auger Collaboration; A. Aab; P. Abreu; M. Aglietta; E. J. Ahn; I. Al Samarai; I. F. M. Albuquerque; I. Allekotte; P. Allison; A. Almela; J. Alvarez Castillo; C. Dobrigkeit; J. C. D'Olivo; A. Dorofeev; R. C. dos Anjos; M. T. Dova; A. Dundovic; J. Ebr; R. Engel; M. Erdmann; M. Erfani; J. Alvarez-Muñiz; C. O. Escobar; J. Espadanal; A. Etchegoyen; H. Falcke; K. Fang; G. Farrar; A. C. Fauth; N. Fazzini; B. Fick; J. M. Figueira; M. Ambrosio; A. Filevich; A. Filipčič; O. Fratu; M. M....

eye 18

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We report a first measurement for ultra-high energy cosmic rays of the correlation between the depth of shower maximum and the signal in the water Cherenkov stations of air-showers registered simultaneously by the fluorescence and the surface detectors of the Pierre Auger Observatory. Such a correlation measurement is a unique feature of a hybrid air-shower observatory with sensitivity to both the electromagnetic and muonic components. It allows an accurate determination of the spread of...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1609.08567

Arxiv.org

10 10.0

Testing Hadronic Interactions at Ultrahigh Energies with Air Showers Measured by the Pierre Auger Observatory

Jun 29, 2018 06/18

by The Pierre Auger Collaboration; A. Aab; P. Abreu; M. Aglietta; E. J. Ahn; I. Al Samarai; I. F. M. Albuquerque; I. Allekotte; J. Allen; P. Allison; A. Almela; M. L. Díaz Castro; F. Diogo; C. Dobrigkeit; J. C. D'Olivo; A. Dorofeev; R. C. dos Anjos; M. T. Dova; A. Dundovic; J. Ebr; R. Engel; J. Alvarez Castillo; M. Erdmann; M. Erfani; C. O. Escobar; J. Espadanal; A. Etchegoyen; H. Falcke; K. Fang; G. Farrar; A. C. Fauth; N. Fazzini; J. Alvarez-Muñiz; A. P. Ferguson; B. Fick; J. M. Figueira; A....

eye 10

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Ultrahigh energy cosmic ray air showers probe particle physics at energies beyond the reach of accelerators. Here we introduce a new method to test hadronic interaction models without relying on the absolute energy calibration, and apply it to events with primary energy 6-16 EeV (E_CM = 110-170 TeV), whose longitudinal development and lateral distribution were simultaneously measured by the Pierre Auger Observatory. The average hadronic shower is 1.33 +- 0.16 (1.61 +- 0.21) times larger than...
Topics: Astrophysics, High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology, High Energy...
Source: http://arxiv.org/abs/1610.08509

Arxiv.org

14 14

Muon Counting using Silicon Photomultipliers in the AMIGA detector of the Pierre Auger Observatory

Jun 30, 2018 06/18

eye 14

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AMIGA (Auger Muons and Infill for the Ground Array) is an upgrade of the Pierre Auger Observatory designed to extend its energy range of detection and to directly measure the muon content of the cosmic ray primary particle showers. The array will be formed by an infill of surface water-Cherenkov detectors associated with buried scintillation counters employed for muon counting. Each counter is composed of three scintillation modules, with a 10 m$^2$ detection area per module. In this paper, a...
Topics: Instrumentation and Detectors, Physics, Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1703.06193

Arxiv.org

14 14

Prototype muon detectors for the AMIGA component of the Pierre Auger Observatory

Jun 29, 2018 06/18

by The Pierre Auger Collaboration; A. Aab; P. Abreu; M. Aglietta; E. J. Ahn; I. Al Samarai; I. F. M. Albuquerque; I. Allekotte; P. Allison; A. Almela; J. Alvarez Castillo; C. Di Giulio; A. Di Matteo; J. C. Diaz; M. L. Díaz Castro; F. Diogo; C. Dobrigkeit; W. Docters; J. C. D'Olivo; A. Dorofeev; Q. Dorosti Hasankiadeh; J. Alvarez-Muñiz; R. C. dos Anjos; M. T. Dova; J. Ebr; R. Engel; M. Erdmann; M. Erfani; C. O. Escobar; J. Espadanal; A. Etchegoyen; H. Falcke; R. Alves Batista; K. Fang; G. Farrar;...

eye 14

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Auger Muons and Infill for the Ground Array) is an upgrade of the Pierre Auger Observatory to extend its range of detection and to directly measure the muon content of the particle showers. It consists of an infill of surface water-Cherenkov detectors accompanied by buried scintillator detectors used for muon counting. The main objectives of the AMIGA engineering array, referred to as the Unitary Cell, are to identify and resolve all engineering issues as well as to understand the muon-number...
Topics: High Energy Physics - Experiment, Physics, Instrumentation and Detectors
Source: http://arxiv.org/abs/1605.01625

Arxiv.org

9 9.0

Nanosecond-level time synchronization of autonomous radio detector stations for extensive air showers

Jun 28, 2018 06/18

by The Pierre Auger Collaboration; A. Aab; P. Abreu; M. Aglietta; E. J. Ahn; I. Al Samarai; I. F. M. Albuquerque; I. Allekotte; P. Allison; A. Almela; J. Alvarez Castillo; J. C. Diaz; M. L. Díaz Castro; F. Diogo; C. Dobrigkeit; W. Docters; J. C. D'Olivo; A. Dorofeev; Q. Dorosti Hasankiadeh; R. C. dos Anjos; M. T. Dova; J. Alvarez-Muñiz; J. Ebr; R. Engel; M. Erdmann; M. Erfani; C. O. Escobar; J. Eser; J. Espadanal; A. Etchegoyen; H. Falcke; K. Fang; R. Alves Batista; G. Farrar; A. C. Fauth; N....

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To exploit the full potential of radio measurements of cosmic-ray air showers at MHz frequencies, a detector timing synchronization within 1 ns is needed. Large distributed radio detector arrays such as the Auger Engineering Radio Array (AERA) rely on timing via the Global Positioning System (GPS) for the synchronization of individual detector station clocks. Unfortunately, GPS timing is expected to have an accuracy no better than about 5 ns. In practice, in particular in AERA, the GPS clocks...
Topics: High Energy Physics - Experiment, Instrumentation and Detectors, Physics
Source: http://arxiv.org/abs/1512.02216

Arxiv.org

35 35

The Pierre Auger Observatory Upgrade - Preliminary Design Report

Jun 29, 2018 06/18

by The Pierre Auger Collaboration; A. Aab; P. Abreu; M. Aglietta; E. J. Ahn; I. Al Samarai; I. F. M. Albuquerque; I. Allekotte; P. Allison; A. Almela; J. Alvarez Castillo; H. Dembinski; N. Dhital; C. Di Giulio; A. Di Matteo; J. C. Diaz; M. L. Díaz Castro; F. Diogo; C. Dobrigkeit; W. Docters; J. C. D'Olivo; J. Alvarez-Muñiz; A. Dorofeev; Q. Dorosti Hasankiadeh; M. T. Dova; J. Ebr; R. Engel; M. Erdmann; M. Erfani; C. O. Escobar; J. Espadanal; A. Etchegoyen; R. Alves Batista; H. Falcke; K. Fang; G....

eye 35

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The Pierre Auger Observatory has begun a major Upgrade of its already impressive capabilities, with an emphasis on improved mass composition determination using the surface detectors of the Observatory. Known as AugerPrime, the upgrade will include new 4 m$^2$ plastic scintillator detectors on top of all 1660 water-Cherenkov detectors, updated and more flexible surface detector electronics, a large array of buried muon detectors, and an extended duty cycle for operations of the fluorescence...
Topics: Astrophysics, High Energy Astrophysical Phenomena, Instrumentation and Methods for Astrophysics
Source: http://arxiv.org/abs/1604.03637

Arxiv.org

43 43

The Pierre Auger Observatory: Contributions to the 34th International Cosmic Ray Conference (ICRC 2015)

Jun 28, 2018 06/18

by The Pierre Auger Collaboration; A. Aab; P. Abreu; M. Aglietta; E. J. Ahn; I. Al Samarai; I. F. M. Albuquerque; I. Allekotte; P. Allison; A. Almela; J. Alvarez Castillo; J. C. Diaz; M. L. Díaz Castro; F. Diogo; C. Dobrigkeit; W. Docters; J. C. D'Olivo; A. Dorofeev; Q. Dorosti Hasankiadeh; R. C. dos Anjos; M. T. Dova; J. Alvarez-Muñiz; J. Ebr; R. Engel; M. Erdmann; M. Erfani; C. O. Escobar; J. Espadanal; A. Etchegoyen; H. Falcke; K. Fang; G. Farrar; R. Alves Batista; A. C. Fauth; N. Fazzini; A....

eye 43

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Contributions of the Pierre Auger Collaboration to the 34th International Cosmic Ray Conference, 30 July - 6 August 2015, The Hague, The Netherlands
Topics: High Energy Astrophysical Phenomena, Instrumentation and Methods for Astrophysics, Astrophysics
Source: http://arxiv.org/abs/1509.03732

Arxiv.org

77 77

Studying the Underlying Event in Drell-Yan and High Transverse Momentum Jet Production at the Tevatron

Sep 17, 2013 09/13

by The CDF Collaboration; T. Aaltonen; J. Adelman; B. Alvarez Gonzalez; S. Amerio; D. Amidei; A. Anastassov; A. Annovi; J. Antos; G. Apollinari; A. Apresyan; T. Arisawa; A. Artikov; J. Asaadi; W. Ashmanskas; A. Attal; A. Aurisano; F. Azfar; W. Badgett; A. Barbaro-Galtieri; V. E. Barnes; B. A. Barnett; P. Barria; P. Bartos; G. Bauer; P. -H. Beauchemin; F. Bedeschi; D. Beecher; S. Behari; G. Bellettini; J. Bellinger; D. Benjamin; A. Beretvas; D. Berge; A. Bhatti; M. Binkley; D. Bisello; I. Bizjak;...

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We study the underlying event in proton-antiproton collisions by examining the behavior of charged particles (transverse momentum pT > 0.5 GeV/c, pseudorapidity |\eta| < 1) produced in association with large transverse momentum jets (~2.2 fb-1) or with Drell-Yan lepton-pairs (~2.7 fb-1) in the Z-boson mass region (70 < M(pair) < 110 GeV/c2) as measured by CDF at 1.96 TeV center-of-mass energy. We use the direction of the lepton-pair (in Drell-Yan production) or the leading jet (in...
Source: http://arxiv.org/abs/1003.3146v1

Arxiv.org

10 10.0

Pierre Auger Observatory and Telescope Array: Joint Contributions to the 34th International Cosmic Ray Conference (ICRC 2015)

Jun 28, 2018 06/18

by Telescope Array Collaboration; R. U. Abbasi; M. Abe; T. Abu-Zayyad; M. Allen; R. Azuma; E. Barcikowski; J. W. Belz; D. R. Bergman; S. A. Blake; R. Cady; K. Tanaka; M. Tanaka; S. B. Thomas; G. B. Thomson; P. Tinyakov; I. Tkachev; H. Tokuno; T. Tomida; S. Troitsky; Y. Tsunesada; M. J. Chae; K. Tsutsumi; Y. Uchihori; S. Udo; F. Urban; G. Vasiloff; T. Wong; R. Yamane; H. Yamaoka; K. Yamazaki; J. Yang; B. G. Cheon; K. Yashiro; Y. Yoneda; S. Yoshida; H. Yoshii; R. Zollinger; Z. Zundel; Pierre Auger...

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Joint contributions of the Pierre Auger Collaboration and the Telescope Array Collaboration to the 34th International Cosmic Ray Conference, 30 July - 6 August 2015, The Hague, The Netherlands.
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1511.02103

Arxiv.org

22 22

The IceCube Neutrino Observatory, the Pierre Auger Observatory and the Telescope Array: Joint Contribution to the 34th International Cosmic Ray Conference (ICRC 2015)

Jun 28, 2018 06/18

by IceCube Collaboration; M. G. Aartsen; K. Abraham; M. Ackermann; J. Adams; J. A. Aguilar; M. Ahlers; M. Ahrens; D. Altmann; T. Anderson; I. Ansseau; G. Golup; J. G. Gonzalez; D. Góra; D. Grant; J. C. Groh; A. Groß; C. Ha; C. Haack; A. Haj Ismail; A. Hallgren; M. Archinger; F. Halzen; B. Hansmann; K. Hanson; D. Hebecker; D. Heereman; K. Helbing; R. Hellauer; D. Hellwig; S. Hickford; J. Hignight; C. Arguelles; G. C. Hill; K. D. Hoffman; R. Hoffmann; K. Holzapfel; A. Homeier; K. Hoshina; F....

eye 22

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We have conducted three searches for correlations between ultra-high energy cosmic rays detected by the Telescope Array and the Pierre Auger Observatory, and high-energy neutrino candidate events from IceCube. Two cross-correlation analyses with UHECRs are done: one with 39 cascades from the IceCube `high-energy starting events' sample and the other with 16 high-energy `track events'. The angular separation between the arrival directions of neutrinos and UHECRs is scanned over. The same events...
Topics: High Energy Physics - Experiment, Astrophysics, Instrumentation and Methods for Astrophysics, High...
Source: http://arxiv.org/abs/1511.02109

Arxiv.org

13 13

Search for correlations between the arrival directions of IceCube neutrino events and ultrahigh-energy cosmic rays detected by the Pierre Auger Observatory and the Telescope Array

Jun 28, 2018 06/18

by The IceCube Collaboration; M. G. Aartsen; K. Abraham; M. Ackermann; J. Adams; J. A. Aguilar; M. Ahlers; M. Ahrens; D. Altmann; T. Anderson; I. Ansseau; Z. Griffith; A. Groß; C. Ha; C. Haack; A. Haj Ismail; A. Hallgren; F. Halzen; E. Hansen; B. Hansmann; K. Hanson; M. Archinger; D. Hebecker; D. Heereman; K. Helbing; R. Hellauer; S. Hickford; J. Hignight; G. C. Hill; K. D. Hoffman; R. Hoffmann; K. Holzapfel; C. Arguelles; A. Homeier; K. Hoshina; F. Huang; M. Huber; W. Huelsnitz; P. O. Hulth; K....

eye 13

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This paper presents the results of different searches for correlations between very high-energy neutrino candidates detected by IceCube and the highest-energy cosmic rays measured by the Pierre Auger Observatory and the Telescope Array. We first consider samples of cascade neutrino events and of high-energy neutrino-induced muon tracks, which provided evidence for a neutrino flux of astrophysical origin, and study their cross-correlation with the ultrahigh-energy cosmic ray (UHECR) samples as a...
Topics: Astrophysics, High Energy Astrophysical Phenomena
Source: http://arxiv.org/abs/1511.09408

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