45
45
Sep 23, 2013
09/13
by
Bryan K. Clark
texts
eye 45
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Z2 spin liquids have topological order. One manifestation of this is that a Z2 spin liquid on a torus exhibits a four-fold degeneracy. Recent numerical evidence has argued for the existence of a spin liquid ground state in the Hubbard model on a honeycomb lattice near U approximately 4. The evidence for this claim involves the presence of a gapped state that lacks any identifiable order. This argument relies on being able to distinguish small order from no order which is notoriously difficult....
Source: http://arxiv.org/abs/1305.0278v1
370
370
May 1, 2012
05/12
by
Wesley K. Clark
texts
eye 370
favorite 4
comment 0
Topics: Clark, Wesley K., Yugoslav War, 1991-1995 -- Personal narratives, American., Yugoslav War,...
Historic Pennsylvania Leaflet No. 22
Topics: oil, Pennsylvania, history, Ida Tarbell, industry, journalism
"An Unrecognized Subspecies of Bellona cristatus" is an article from The Auk, Volume 22 . View more articles from The Auk . View this article on JSTOR . View this article's JSTOR metadata . You may also retrieve all of this items metadata in JSON at the following URL: https://archive.org/metadata/jstor-4069733
Source: http://www.jstor.org/stable/10.2307/4069733
151
151
Feb 11, 2016
02/16
by
B Kensley; K Clark
texts
eye 151
favorite 0
comment 0
4
4.0
Jun 30, 2018
06/18
by
Hassan Shapourian; Bryan K. Clark
texts
eye 4
favorite 0
comment 0
We study the extended Bose-Hubbard model on the square lattice at half filling as a function of next-nearest neighbor hopping amplitude and interaction strength. To variationally map out the phase diagram of this model, we develop a two-parameter family of wave-functions based on the parton construction which can describe both topological and broken symmetry phases on equal footing. In addition, our wave-functions resolve long standing issues with more conventional short-range Jastrow...
Topics: Quantum Gases, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1412.5597
6
6.0
Jun 30, 2018
06/18
by
David Pekker; Bryan K. Clark
texts
eye 6
favorite 0
comment 0
Anderson insulators are non-interacting disordered systems which have localized single particle eigenstates. The interacting analogue of Anderson insulators are the Many-Body Localized (MBL) phases. The natural language for representing the spectrum of the Anderson insulator is that of product states over the single-particle modes. We show that product states over Matrix Product Operators of small bond dimension is the corresponding natural language for describing the MBL phases. In this...
Topics: Strongly Correlated Electrons, Disordered Systems and Neural Networks, Condensed Matter
Source: http://arxiv.org/abs/1410.2224
19
19
Mar 14, 2020
03/20
by
D R Franz; K Clark
texts
eye 19
favorite 0
comment 0
80
80
Sep 21, 2013
09/13
by
Michael H. Kolodrubetz; Bryan K. Clark
texts
eye 80
favorite 0
comment 0
Finding the ground state of a fermionic Hamiltonian using quantum Monte Carlo is a very difficult problem, due to the Fermi sign problem. While still scaling exponentially, full configuration-interaction Monte Carlo (FCI-QMC) mitigates some of the exponential variance by allowing annihilation of noise -- whenever two walkers arrive at the same configuration with opposite signs, they are removed from the simulation. While FCI-QMC has been quite successful for quantum chemistry problems, its...
Source: http://arxiv.org/abs/1204.1490v1
5
5.0
Jun 30, 2018
06/18
by
Bryan K. Clark; Hitesh J. Changlani
texts
eye 5
favorite 0
comment 0
We apply a series of projection techniques on top of tensor networks to compute energies of ground state wave functions with higher accuracy than tensor networks alone with minimal additional cost. We consider both matrix product states as well as tree tensor networks in this work. Building on top of these approaches, we apply fixed-node quantum Monte Carlo, Lanczos steps, and exact projection. We demonstrate these improvements for the triangular lattice Heisenberg model, where we capture up to...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1404.2296
3
3.0
Dec 22, 2021
12/21
by
Brad R. Blood; Mary K. Clark
texts
eye 3
favorite 0
comment 0
"Journal of the Society of Arts, Vol. 13, no. 653" is an article from The Journal of the Society of Arts, Volume 13 . View more articles from The Journal of the Society of Arts . View this article on JSTOR . View this article's JSTOR metadata . You may also retrieve all of this items metadata in JSON at the following URL: https://archive.org/metadata/jstor-41323769
Source: http://www.jstor.org/stable/10.2307/41323769
16
16
Jun 28, 2018
06/18
by
Xiongjie Yu; David Pekker; Bryan K. Clark
texts
eye 16
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comment 0
A key property of many-body localization, the localization of quantum particles in systems with both quenched disorder and interactions, is the area law entanglement of even highly excited eigenstates of many-body localized Hamiltonians. Matrix Product States (MPS) can be used to efficiently represent low entanglement (area law) wave functions in one dimension. An important application of MPS is the widely used Density Matrix Renormalization Group (DMRG) algorithm for finding ground states of...
Topics: Disordered Systems and Neural Networks, Strongly Correlated Electrons, Condensed Matter, Quantum...
Source: http://arxiv.org/abs/1509.01244
54
54
Sep 21, 2013
09/13
by
Bryan K. Clark; Michele Casula; D. M. Ceperley
texts
eye 54
favorite 0
comment 0
We study the Wigner crystal melting in a two dimensional quantum system of particles interacting via the 1/r Coulomb potential. We use quantum Monte Carlo methods to calculate its phase diagram, locate the Wigner crystal region, and analyze its instabilities towards the liquid phase. We discuss the role of quantum effects in the critical behavior of the system, and compare our numerical results with the classical theory of melting, and the microemulsion theory of frustrated Coulomb systems. We...
Source: http://arxiv.org/abs/0905.4515v1
66
66
Sep 23, 2013
09/13
by
Michael Kolodrubetz; Bryan K. Clark; David A. Huse
texts
eye 66
favorite 0
comment 0
We solve for the time-dependent finite-size scaling functions of the 1D transverse-field Ising chain during a linear-in-time ramp of the field through the quantum critical point. We then simulate Mott-insulating bosons in a tilted potential, an experimentally-studied system in the same equilibrium universality class, and demonstrate that universality holds for the dynamics as well. We find qualitatively athermal features of the scaling functions, such as negative spin correlations, and show...
Source: http://arxiv.org/abs/1112.6422v3
3
3.0
Jun 29, 2018
06/18
by
Xiongjie Yu; David J. Luitz; Bryan K. Clark
texts
eye 3
favorite 0
comment 0
We introduce the cut averaged entanglement entropy in disordered periodic spin chains and prove it to be a concave function of subsystem size for individual eigenstates. This allows us to identify the entanglement scaling as a function of subsystem size for individual states in inhomogeneous systems. Using this quantity, we probe the critical region between the many-body localized (MBL) and ergodic phases in finite systems. In the middle of the spectrum, we show evidence for bimodality of the...
Topics: Disordered Systems and Neural Networks, Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1606.01260
"Journal of the Society of Arts, Vol. 13, no. 655" is an article from The Journal of the Society of Arts, Volume 13 . View more articles from The Journal of the Society of Arts . View this article on JSTOR . View this article's JSTOR metadata . You may also retrieve all of this items metadata in JSON at the following URL: https://archive.org/metadata/jstor-41323770
Source: http://www.jstor.org/stable/10.2307/41323770
45
45
Sep 21, 2013
09/13
by
Michael Kolodrubetz; David Pekker; Bryan K. Clark; Krishnendu Sengupta
texts
eye 45
favorite 0
comment 0
We study the non-equilibrium dynamics of one-dimensional Mott insulating bosons in the presence of a tunable effective electric field E which takes the system across a quantum critical point (QCP) separating a disordered and a translation symmetry broken ordered phase. We provide an exact numerical computation of the residual energy Q, the log-fidelity F, the excess defect density D, and the order parameter correlation function for a linear-in-time variation of E with a rate v. We discuss the...
Source: http://arxiv.org/abs/1106.4031v1
49
49
Sep 18, 2013
09/13
by
D. K. Clark; L. S. Tsimring; I. S. Aranson
texts
eye 49
favorite 0
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We report an experimental study of the dynamics of an air-fluidized thin granular layer. Near-onset behavior of this shallow fluidized bed was described in the earlier paper (Tsimring et al, 1999). Above the threshold of fluidization the system exhibits a Hopf bifurcation as the layer starts to oscillate at a certain frequency due to a feedback between the layer dilation and the airflow drag force. After application of temporal band-pass filtering of this frequency we discovered the...
Source: http://arxiv.org/abs/nlin/0005010v1
59
59
Sep 19, 2013
09/13
by
B. K. Clark; D. A. Abanin; S. L. Sondhi
texts
eye 59
favorite 0
comment 0
Recent numerical work (Nature 464, 847 (2010)) indicates the existence of a spin liquid phase (SL) that intervenes between the antiferromagnetic and semimetallic phases of the half filled Hubbard model on a honeycomb lattice. To better understand the nature of this exotic phase, we study the quantum $J_1-J_2$ spin model on the honeycomb lattice, which provides an effective description of the Mott insulating region of the Hubbard model. Employing the variational Monte Carlo approach, we analyze...
Source: http://arxiv.org/abs/1010.3011v1
16
16
Oct 30, 2019
10/19
by
M K Clark; D S Lee; J B Funderburg
texts
eye 16
favorite 0
comment 0
3
3.0
Jun 29, 2018
06/18
by
Krishna Kumar; Hitesh J. Changlani; Bryan K. Clark; Eduardo Fradkin
texts
eye 3
favorite 0
comment 0
We perform an exact diagonalization study of the spin-$1/2$ XXZ Heisenberg antiferromagnet on the kagome lattice at finite magnetization $m = \frac{2}{3}$ with an emphasis on the XY point ($J_z = 0$), and in the presence of a small chiral term. Recent analytic work by Kumar, Sun and Fradkin [Phys. Rev. B 90, 174409 (2014)] on the same model, using a newly developed flux attachment transformation, predicts a plateau at this value of the magnetization described by a chiral spin liquid (CSL) with...
Topics: Condensed Matter, Strongly Correlated Electrons
Source: http://arxiv.org/abs/1606.04103
16
16
Jun 28, 2018
06/18
by
Xiao Chen; Xiongjie Yu; Gil Young Cho; Bryan K. Clark; Eduardo Fradkin
texts
eye 16
favorite 0
comment 0
We construct a family of many-body wave functions to study the many-body localization phase transition. The wave functions have a Rokhsar-Kivelson form, in which the weight for the configurations are chosen from the Gibbs weights of a classical spin glass model, known as the Random Energy Model, multiplied by a random sign structure to represent a highly excited state. These wave functions show a phase transition into an MBL phase. In addition, we see three regimes of entanglement scaling with...
Topics: Disordered Systems and Neural Networks, Statistical Mechanics, Strongly Correlated Electrons,...
Source: http://arxiv.org/abs/1509.03890
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87
Sep 23, 2013
09/13
by
M. A. Morales; J. McMinis; B. K. Clark; J. Kim; G. Scuseria
texts
eye 87
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comment 0
Quantum Monte Carlo (QMC) methods have received considerable attention over the last decades due to their great promise for providing a direct solution to the many-body Schrodinger equation in electronic systems. Thanks to their low scaling with number of particles, QMC methods present a compelling competitive alternative for the accurate study of large molecular systems and solid state calculations. In spite of such promise, the method has not permeated the quantum chemistry community broadly,...
Source: http://arxiv.org/abs/1303.6676v1
10
10.0
Jun 30, 2018
06/18
by
Hitesh J. Changlani; Dmitrii Kochkov; Krishna Kumar; Bryan K. Clark; Eduardo Fradkin
texts
eye 10
favorite 0
comment 0
One of the challenges in theoretical condensed matter physics is the physics of strongly correlated systems in regimes in which all interactions are nearly equally strong. This is particularly the case in quantum spin systems on geometrically frustrated lattices where, the inability to simultaneously satisfy competing exchange interactions, often results in the selection of magnetically ordered or exotic disordered spin liquid ground states. We report the existence of a quantum macroscopically...
Topics: Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1703.04659
61
61
Sep 18, 2013
09/13
by
Ethan W. Brown; Bryan K. Clark; Jonathan L. DuBois; David M. Ceperley
texts
eye 61
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comment 0
We perform calculations of the {3D} finite-temperature homogeneous electron gas (HEG) in the warm-dense regime ({r_{s} \equiv (3/4\pi n)^{1/3}a_{B}^{- 1} = 1.0- 40.0} and {\Theta \equiv T/T_{F} = 0.0625- 8.0}) using restricted path integral Monte Carlo (RPIMC). Precise energies, pair correlation functions, and structure factors are obtained. For all densities, we find a significant discrepancy between the ground state parameterized local density approximation (LDA) and our results around...
Source: http://arxiv.org/abs/1211.6130v2
59
59
Sep 21, 2013
09/13
by
Bryan K. Clark; Miguel A. Morales; Jeremy McMinis; Jeongnim Kim; Gustavo E. Scuseria
texts
eye 59
favorite 0
comment 0
Quantum Monte Carlo (QMC) methods such as variational Monte Carlo and fixed node diffusion Monte Carlo depend heavily on the quality of the trial wave function. Although Slater-Jastrow wave functions are the most commonly used variational ansatz in electronic structure, more sophisticated wave-functions are critical to ascertaining new physics. One such wave function is the multiSlater-Jastrow wave function which consists of a Jastrow function multiplied by the sum of Slater determinants. In...
Source: http://arxiv.org/abs/1106.2456v1
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40
Sep 21, 2013
09/13
by
Kapil Ahuja; Bryan K. Clark; Eric de Sturler; David M. Ceperley; Jeongnim Kim
texts
eye 40
favorite 0
comment 0
Quantum Monte Carlo (QMC) methods are often used to calculate properties of many body quantum systems. The main cost of many QMC methods, for example the variational Monte Carlo (VMC) method, is in constructing a sequence of Slater matrices and computing the ratios of determinants for successive Slater matrices. Recent work has improved the scaling of constructing Slater matrices for insulators so that the cost of constructing Slater matrices in these systems is now linear in the number of...
Source: http://arxiv.org/abs/1008.5113v2
34
34
Sep 18, 2013
09/13
by
Michael H. Kolodrubetz; James S. Spencer; Bryan K. Clark; W. Matthew C. Foulkes
texts
eye 34
favorite 0
comment 0
The sign problem in Full Configuration Interaction Quantum Monte Carlo (FCIQMC) without annihilation can be understood as an instability of the psi-particle population to the ground state of the matrix obtained by making all off-diagonal elements of the Hamiltonian negative. Such a matrix, and hence the sign problem, is basis dependent. In this paper we discuss the properties of a physically important basis choice: first versus second quantization. For a given choice of single-particle...
Source: http://arxiv.org/abs/1209.3044v3
"Journal of the Society for Arts, Vol. 7, no. 340" is an article from The Journal of the Society of Arts, Volume 7 . View more articles from The Journal of the Society of Arts . View this article on JSTOR . View this article's JSTOR metadata . You may also retrieve all of this items metadata in JSON at the following URL: https://archive.org/metadata/jstor-41334483
Source: http://www.jstor.org/stable/10.2307/41334483
20
20
Jun 28, 2018
06/18
by
Dave Wecker; Matthew B. Hastings; Nathan Wiebe; Bryan K. Clark; Chetan Nayak; Matthias Troyer
texts
eye 20
favorite 0
comment 0
One of the main applications of future quantum computers will be the simulation of quantum models. While the evolution of a quantum state under a Hamiltonian is straightforward (if sometimes expensive), using quantum computers to determine the ground state phase diagram of a quantum model and the properties of its phases is more involved. Using the Hubbard model as a prototypical example, we here show all the steps necessary to determine its phase diagram and ground state properties on a...
Topics: Quantum Physics, Strongly Correlated Electrons, Condensed Matter
Source: http://arxiv.org/abs/1506.05135
"Journal of the Society of Arts, Vol. 13, no. 651" is an article from The Journal of the Society of Arts, Volume 13 . View more articles from The Journal of the Society of Arts . View this article on JSTOR . View this article's JSTOR metadata . You may also retrieve all of this items metadata in JSON at the following URL: https://archive.org/metadata/jstor-41323767
Source: http://www.jstor.org/stable/10.2307/41323767
78 RPMs and Cylinder Recordings
54
54
Dec 20, 2021
12/21
by
THE THELONIOUS MONK QUARTET; MILTON JACKSON; THELONIOUS MONK; JOHN SIMMONS; SHADOW WILSON; T. MONK; K. CLARK
audio
eye 54
favorite 0
comment 1
Performer: THE THELONIOUS MONK QUARTET; MILTON JACKSON; THELONIOUS MONK; JOHN SIMMONS; SHADOW WILSON Writer: T. MONK; K. CLARK vibraphone; piano; bass; drums. Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 2.0mil truncated conical, 2.3mil truncated conical, 2.8mil truncated conical, 3.3mil truncated conical. These were recorded flat and then also equalized with Turnover: 400.0, Rolloff: -12.0. The preferred versions suggested by an audio engineer...
( 1 reviews )
Topics: 78rpm, Jazz
Source: 78
78 RPMs and Cylinder Recordings
43
43
Nov 13, 2021
11/21
by
THE THELONIOUS MONK QUINTET; MILTON JACKSON; THELONIOUS MONK; JOHN SIMMONS; SHADOW WILSON; T. MONK; K. CLARK
audio
eye 43
favorite 0
comment 1
Performer: THE THELONIOUS MONK QUINTET; MILTON JACKSON; THELONIOUS MONK; JOHN SIMMONS; SHADOW WILSON Writer: T. MONK; K. CLARK vibraphone ; piano ; bass ; drums. Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 3.5mil truncated eliptical, 2.3mil truncated conical, 2.8mil truncated conical, 3.3mil truncated conical. These were recorded flat and then also equalized with Turnover: 450.0, Rolloff: -10.5. The preferred versions suggested by an audio...
( 1 reviews )
Topics: 78rpm, Jazz
Source: 78
78 RPMs and Cylinder Recordings
31
31
Nov 13, 2021
11/21
by
DIZZY GILLESPIE SEXTET; S. Stitt; M. Jackson; D. Gillespie; R. Brown; K. Clark; A. Haig; Dizzy Gillespie
audio
eye 31
favorite 0
comment 1
Performer: DIZZY GILLESPIE SEXTET; S. Stitt; M. Jackson; D. Gillespie; R. Brown; K. Clark; A. Haig Writer: Dizzy Gillespie Instrumental; (Part 1); alto sax; vibraphone; trumpet; bass; drums; piano. Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 3.8mil truncated conical, 2.3mil truncated conical, 2.8mil truncated conical, 3.3mil truncated conical. These were recorded flat and then also equalized with Turnover: 375.0, Rolloff: -12.0. The preferred...
( 1 reviews )
Topics: 78rpm, Jazz
Source: 78
78 RPMs and Cylinder Recordings
68
68
Sep 17, 2020
09/20
by
DIZZY GILLESPIE and his Sextet; S. Stitt; M. Jackson; R. Brown; K. Clark; A. Haig; D. Gillespie; Ray Brown
audio
eye 68
favorite 0
comment 1
Performer: DIZZY GILLESPIE and his Sextet; S. Stitt; M. Jackson; R. Brown; K. Clark; A. Haig; D. Gillespie Writer: Ray Brown Instrumental; alto sax; vibraphone; bass; drums; piano; trumpet. Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 3.5mil truncated eliptical, 2.3mil truncated conical, 2.8mil truncated conical, 3.3mil truncated conical. These were recorded flat and then also equalized with Turnover: 450.0, Rolloff: -10.5. The preferred...
( 1 reviews )
Topics: 78rpm, Jazz
Source: 78
78 RPMs and Cylinder Recordings
104
104
Sep 17, 2020
09/20
by
DIZZY GILLESPIE and his Sextet; S. Stitt; M. Jackson; R. Brown; K. Clark; A. Haig; D. Gillespie; Gillespie; Fuller
audio
eye 104
favorite 0
comment 1
Performer: DIZZY GILLESPIE and his Sextet; S. Stitt; M. Jackson; R. Brown; K. Clark; A. Haig; D. Gillespie Writer: Gillespie; Fuller Instrumental; alto sax; vibraphone; bass; drums; piano; trumpet. Digitized at 78 revolutions per minute. Four stylii were used to transfer this record. They are 3.5mil truncated eliptical, 2.3mil truncated conical, 2.8mil truncated conical, 3.3mil truncated conical. These were recorded flat and then also equalized with Turnover: 450.0, Rolloff: -10.5. The...
( 1 reviews )
Topics: 78rpm, Jazz
Source: 78
608
608
Jun 21, 2005
06/05
by
K Clark
audio
eye 608
favorite 0
comment 0
Seattle and Beyond Podcast 12
Topic: Podcasts
Source: http://www.getniched.com/seattleblog/
Boston Public Library 78rpm Collection
337
337
Oct 23, 2018
10/18
by
A. Haig; R. Brown; K. Clark; Gillespie; Brown; Dizzy Gillespie and his Orchestra; Ray Brown; M. Jackson; Dizzy Gillespie; S. Stitt; D. Gillespie; Dizzy Gillespie Sextet
audio
eye 337
favorite 0
comment 1
Performer: Dizzy Gillespie Sextet; S. Stitt; M. Jackson; D. Gillespie; R. Brown; K. Clark; A. Haig; Dizzy Gillespie and his Orchestra; Ray Brown Writer: Dizzy Gillespie; Gillespie; Brown Instrumental; alto sax; vibraphone; trumpet; bass; drums; piano; Bass. Digitized at 78 revolutions per minute. Four stylii were used to transfer these records. They are 3.8mil truncated conical, 2.3mil truncated conical, 2.8mil truncated conical, 3.3mil truncated conical. These were recorded flat and then also...
( 1 reviews )
Topics: Jazz, 78rpm
Source: 78
34
34
Sep 24, 2013
09/13
by
T. G. Lee; C. Rochow; R. Martin; T. K. Clark; R. C. Forrey; N. Balakrishnan; P. C. Stancil; D. R. Schultz; A. Dalgarno; G. J. Ferland
texts
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The two most recently published potential energy surfaces (PESs) for the HeH$_2$ complex, the so-called MR (Muchnick and Russek) and BMP (Boothroyd, Martin, and Peterson) surfaces, are quantitatively evaluated and compared through the investigation of atom-diatom collision processes. The BMP surface is expected to be an improvement, approaching chemical accuracy, over all conformations of the PES compared to that of the MR surface. We found significant differences in inelastic rovibrational...
Source: http://arxiv.org/abs/astro-ph/0412201v1
"Journal of the Society of Arts, Vol. 13, no. 628" is an article from The Journal of the Society of Arts, Volume 13 . View more articles from The Journal of the Society of Arts . View this article on JSTOR . View this article's JSTOR metadata . You may also retrieve all of this items metadata in JSON at the following URL: https://archive.org/metadata/jstor-41323736
Source: http://www.jstor.org/stable/10.2307/41323736
4
4.0
Jun 30, 2018
06/18
by
R. Alves; S. Andringa; S. Bradbury; J. Carvalho; D. Chauhan; K. Clark; I. Coulter; F. Descamps; E. Falk; L. Gurriana; C. Kraus; G. Lefeuvre; A. Maio; J. Maneira; M. Mottram; S. Peeters; J. Rose; L. Seabra; J. Sinclair; P. Skensved; J. Waterfield; R. White; J. R. Wilson
texts
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A light injection system using LEDs and optical fibres was designed for the calibration and monitoring of the photomultiplier array of the SNO+ experiment at SNOLAB. Large volume, non-segmented, low-background detectors for rare event physics, such as the multi-purpose SNO+ experiment, need a calibration system that allow an accurate and regular measurement of the performance parameters of their photomultiplier arrays, while minimising the risk of radioactivity ingress. The design implemented...
Topics: Physics, High Energy Physics - Experiment, Instrumentation and Detectors
Source: http://arxiv.org/abs/1411.4830
112
112
Sep 17, 2013
09/13
by
F. Aubin; M. Auger; E. Behnke; B. Beltran; K. Clark; X. Dai; A. Davour; M. -H. Genest; G. Giroux; R. Gornea; R. Faust; C. B. Krauss; C. Leroy; L. Lessard; I. Levine; C. Levy; J. -P. Martin; T. Morlat; A. J. Noble; P. Nadeau; M. -C. Piro; S. Pospisil; T. Shepherd; J. Sodomka; N. Starinski; I. Stekl; C. Storey; U. Wichoski; V. Zacek
texts
eye 112
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The PICASSO collaboration observed for the first time a significant difference between the acoustic signals induced by neutrons and alpha particles in a detector based on superheated liquids. This new discovery offers the possibility of improved background suppression and could be especially useful for dark matter experiments. This new effect may be attributed to the formation of multiple bubbles on alpha tracks, compared to single nucleations created by neutron induced recoils.
Source: http://arxiv.org/abs/0807.1536v2
46
46
Sep 18, 2013
09/13
by
HyperCP Collaboration; D. Rajaram; R. A. Burnstein; A. Chakravorty; Y. C. Chen; W. -S. Choong; K. Clark; E. C. Dukes; C. Durandet; J. Felix; Y. Fu; G. Gidal; H. R. Gustafson; T. Holmstrom; M. Huang; C. James; C. M. Jenkins; T. D. Jones; D. M. Kaplan; M. J. Longo; L. C. Lu; W. Luebke; K. -B. Luk; K. S. Nelson; H. K. Park; J. -P. Perroud; H. A. Rubin; J. Volk; C. G. White; S. L. White; P. Zyla
texts
eye 46
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comment 0
A sensitive search for the lepton-number-violating decay $\Xi^-\to p \mu^-\mu^-$ has been performed using a sample of $\sim10^9$ $\Xi^-$ hyperons produced in 800 GeV/$c$ $p$-Cu collisions. We obtain $\mathcal{B}(\Xi^-\to p \mu^-\mu^-) < 4.0\times 10^{-8}$ at 90% confidence, improving on the best previous limit by four orders of magnitude.
Source: http://arxiv.org/abs/hep-ex/0505025v1
46
46
Sep 18, 2013
09/13
by
HyperCP Collaboration; L. C. Lu; R. A. Burnstein; A. Chakravorty; Y. C. Chen; W. -S. Choong; K. Clark; E. C. Dukes; C. Durandet; J. Felix; Y. Fu; G. Gidal; H. R. Gustafson; T. Holmstrom; M. Huang; C. James; C. M. Jenkins; T. D. Jones; D. M. Kaplan; M. J. Longo; W. Luebke; K. -B. Luk; K. S. Nelson; H. K. Park; J. -P. Perroud; D. Rajaram; H. A. Rubin; J. Volk; C. G. White; S. L. White; P. Zyla
texts
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The alpha decay parameter in the process Omega-minus -> Lambda + K-minus has been measured from a sample of 4.50 million unpolarized Omega-minus decays recorded by the HyperCP (E871) experiment at Fermilab and found to be [1.78 +/- 0.19(stat) +/- 0.16(syst)]{\times}10^{-2}. This is the first unambiguous evidence for a nonzero alpha decay parameter, and hence parity violation, in the Omega-minus -> Lambda + K-minus decay.
Source: http://arxiv.org/abs/hep-ex/0505010v1
54
54
Sep 20, 2013
09/13
by
M. J. Longo; R. A. Burnstein; A. Chakravorty; Y. C. Chen; W. S. Choong; K. Clark; E. C. Dukes; C. Durandet; J. Felix; Y. Fu; G. Gidal; H. R. Gustafson; T. Holmstrom; M. Huang; C. James; C. M. Jenkins; T. Jones; D. M. Kaplan; L. M. Lederman; N. Leros; F. Lopez; L. C. Lu; W. Luebke; K. B. Luk; K. S. Nelson; H. K. Park; J. -P. Perroud; D. Rajaram; H. A. Rubin; J. Volk; C. G. White; S. White; P. Zyla
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We have searched for Theta+(1.54) -> K0,p decays using data from the 1999 run of the HyperCP experiment at Fermilab. We see no evidence for a narrow peak in the K0,p mass distribution near 1.54 GeV/c among 106,000 K0,p candidates, and obtain an upper limit for the fraction of Theta+(1.54) to K0,p candidates of
Source: http://arxiv.org/abs/hep-ex/0410027v2
51
51
Sep 21, 2013
09/13
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HyperCP Collaboration; O. Kamaev; N. Solomey; R. A. Burnstein; A. Chakravorty; Y. C. Chen; W. -S. Choong; K. Clark; E. C. Dukes; C. Durandet; J. Felix; Y. Fu; G. Gidal; H. R. Gustafson; T. Holmstrom; M. Huang; C. James; C. M. Jenkins; T. D. Jones; D. M. Kaplan; M. J. Longo; L. C. Lu; W. Luebke; K. -B. Luk; K. S. Nelson; H. K. Park; J. -P. Perroud; D. Rajaram; H. A. Rubin; J. Volk; C. G. White; S. L. White; P. Zyla
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We report a new measurement of the decay \Omega^- \to \Xi^- \pi^+ \pi^- with 76 events and a first observation of the decay \Omega^+ \to \Xi^+ \pi^+ \pi^- with 24 events, yielding a combined branching ratio (3.74 ^{+0.67}_{-0.56}) \times 10^{-4}. This represents a factor 25 increase in statistics over the best previous measurement. No evidence is seen for CP violation, with B(\Omega^- \to \Xi^- \pi^+ \pi^-)=4.04^{+0.83}_{-0.71} \times 10^{-4} and B(\Omega^+ \to \Xi^+ \pi^+...
Source: http://arxiv.org/abs/1008.4405v1
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52
Sep 21, 2013
09/13
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S. Archambault; F. Aubin; M. Auger; M. Beleshi; E. Behnke; J. Behnke; B. Beltran; K. Clark; X. Dai; A. Davour; F. Debris. J. Farine; M. -H. Genest; G. Giroux; R. Gornea; R. Faust; H. Hinnefeld; A. Kamaha; C. B. Krauss; M. Lafrenière; M. Laurin; I. Lawson; C. Leroy; C. Lévy; L. Lessard; I. Levine; J. -P. Martin; S. Kumaratunga; R. MacDonald; R. Nadeau; A. Noble; M. -C. Piro; S. Pospisil; N. Starinski; I. Stekl; N. Vander Werf; U. Wichoski; V. Zacek
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We report new results obtained in calibrations of superheated liquid droplet detectors used in dark matter searches with different radiation sources (n,$\alpha$,$\gamma$). In particular, detectors were spiked with alpha-emitters located inside and outside the droplets. It is shown that the responses are different, depending on whether alpha particles or recoil nuclei create the signals. The energy thresholds for $\alpha$-emitters are compared with test beam measurements using mono-energetic...
Source: http://arxiv.org/abs/1011.4553v1
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54
Sep 22, 2013
09/13
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H. K. Park; R. A. Burnstein; A. Chakravorty; Y. C. Chen; W. S. Choong; K. Clark; E. C. Dukes; C. Durandet; J. Felix; Y. Fu; G. Gidal; H. R. Gustafson; T. Holmstrom; M. Huang; C. James; C. M. Jenkins; T. Jones; D. M. Kaplan; L. M. Lederman; N. Leros; M. J. Longo; F. Lopez; L. C. Lu; W. Luebke; K. B. Luk; K. S. Nelson; J. -P. Perroud; D. Rajaram; H. A. Rubin; J. Volk; C. G. White; S. L. White; P. Zyla
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We report the first evidence for the decay Sigma+ -> p mu+ mu- from data taken by the HyperCP experiment(E871) at Fermilab. Based on three observed events, the branching ratio is B(Sigma+ -> p,mu+,mu-) = [8.6 +6.6,-5.4(stat) +/-5.5(syst)] x 10**-8. The narrow range of dimuon masses may indicate that the decay proceeds via a neutral intermediate state, Sigma+ -> p P0, P0 -> mu+ mu-, with a P0 mass of 214.3 +/- 0.5 MeV/c**2 and branching ratio B(Sigma+ -> p P0; P0 -> mu+ mu-) =...
Source: http://arxiv.org/abs/hep-ex/0501014v2
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40
Sep 24, 2013
09/13
by
HyperCP Collaboration; T. Holmstrom; N. Leros; R. A. Burnstein; A. Chakravorty; A. Chan; Y. C. Chen; W. S. Choong; K. Clark; E. C. Dukes; C. Durandet; J. Felix; Y. Fu; G. Gidal; P. Gu; H. R. Gustafson; C. Ho; M. Huang; C. James; C. M. Jenkins; T. Jones; D. M. Kaplan; L. M. Lederman; M. J. Longo; F. Lopez; L. C. Lu; W. Luebke; K. B. Luk; K. S. Nelson; H. K. Park; J. P. Perroud; D. Rajaram; H. A. Rubin; P. K. Teng; J. Volk; C. G. White; S. L. White; P. Zyla
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We have compared the proton and antiproton angular distributions in 117 million Xi-minus -> Lambda + pi-minus -> proton + pi-minus + pi-minus and 41 million anti-Xi-minus -> anti-Lamba + pi-plus -> antiproton + pi-plus + pi-plus decays using a subset of the data from the HyperCP experiment (E871) at Fermilab. We find no evidence of CP violation, with the direct-CP-violating parameter $A_{\Xi\Lambda} = \frac{\alpha_{\Xi}\alpha_{\Lambda} -...
Source: http://arxiv.org/abs/hep-ex/0412038v1
