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Heavy-quark production and elliptic flow in Au + Au collisions at sNN=62.4 GeV

Physical Review C 2015年第4期91卷 044907-044907页

作者： A. Adare C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto H. Al-Ta'ani J. Alexander A. Angerami K. Aoki N. Apadula Y. Aramaki H. Asano E. C. Aschenauer E. T. Atomssa T. C. Awes B. Azmoun V. Babintsev M. Bai B. Bannier K. N. Barish B. Bassalleck S. Bathe V. Baublis S. Baumgart A. Bazilevsky R. Belmont A. Berdnikov Y. Berdnikov X. Bing D. S. Blau J. S. Bok K. Boyle M. L. Brooks H. Buesching V. Bumazhnov S. Butsyk S. Campbell P. Castera C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi S. Choi R. K. Choudhury P. Christiansen T. Chujo O. Chvala V. Cianciolo Z. Citron B. A. Cole M. Connors M. Csanád T. Csörgő S. Dairaku A. Datta M. S. Daugherity G. David A. Denisov A. Deshpande E. J. Desmond K. V. Dharmawardane O. Dietzsch L. Ding A. Dion M. Donadelli O. Drapier A. Drees K. A. Drees J. M. Durham A. Durum L. D'Orazio S. Edwards Y. V. Efremenko T. Engelmore A. Enokizono S. Esumi K. O. Eyser B. Fadem D. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin J. E. Frantz A. Franz A. D. Frawley Y. Fukao T. Fusayasu K. Gainey C. Gal A. Garishvili I. Garishvili A. Glenn X. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji L. Guo H.-Å. Gustafsson T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki J. Hanks K. Hashimoto E. Haslum R. Hayano X. He T. K. Hemmick T. Hester J. C. Hill R. S. Hollis K. Homma B. Hong T. Horaguchi Y. Hori S. Huang T. Ichihara H. Iinuma Y. Ikeda J. Imrek M. Inaba A. Iordanova D. Isenhower M. Issah D. Ivanishchev B. V. Jacak M. Javani J. Jia X. Jiang B. M. Johnson K. S. Joo D. Jouan D. S. Jumper J. Kamin S. Kaneti B. H. Kang J. H. Kang J. S. Kang J. Kapustinsky K. Karatsu M. Kasai D. Kawall A. V. Kazantsev T. Kempel A. Khanzadeev K. M. Kijima B. I. Kim C. Kim D. J. Kim E.-J. Kim H. J. Kim K.-B. Kim Y.-J. Kim Y. K. Kim E. Kinney Á. Kiss E. Kistenev J. Klatsky D. Kleinjan P. Kline Y. Komatsu B. Komkov J. Koster D. Kotchetkov D. Kotov A. Král F. Krizek G. J. Kunde K. Kurita M. Kurosawa Y. Kwon G. S. Kyle R. Lacey Y. S. Lai J. G. Lajoie A. Lebedev B. Lee D. M. Lee University of Colorado Boulder Colorado 80309 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan New Mexico State University Las Cruces New Mexico 88003 USA Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA Kyoto University Kyoto 606-8502 Japan Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA University of California–Riverside Riverside California 92521 USA University of New Mexico Albuquerque New Mexico 87131 USA Baruch College City University of New York New York New York 10010 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Vanderbilt University Nashville Tennessee 37235 USA Saint Petersburg State Polytechnic University St. Petersburg 195251 Russia Department of Physics and Astronomy Ohio University Athens Ohio 45701 USA Russian Research Center “Kurchatov Institute ” Moscow 123098 Russia Yonsei University IPAP Seoul 120-749 Korea University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Chonbuk National University Jeonju 561-756 Korea Department of Physics and Astronomy Seoul National Un

We present measurements of electrons and positrons from the semileptonic decays of heavy-flavor hadrons at midrapidity (|y|< 0.35) in Au+Au collisions at sNN=62.4 GeV. The data were collected in 2010 by the PHENIX experiment that included the new hadron-blind detector. The invariant yield of electrons from heavy-flavor decays is measured as a function of transverse momentum in the range 1

关键词： HEAVY ion collisions RESEARCH HEAVY quark effective theory ANGULAR momentum (Nuclear physics) PARTICLE range (Nuclear physics) RADIOACTIVE decay NUCLEAR research

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Nanostructure investigations of nonlinear differential conductance in NdNiO3 thin films

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Physical Review B 2014年第20期90卷 205117-205117页

作者： Will J. Hardy Heng Ji Evgeny Mikheev Susanne Stemmer Douglas Natelson Applied Physics Program Rice Quantum Institute Rice University Houston Texas 77005 USA Department of Physics and Astronomy Rice University Houston Texas 77005 USA Materials Department University of California Santa Barbara California USA Department of Electrical and Computer Engineering and Department of Materials Science and Nanoengineering Rice University Houston Texas 77005 USA

Transport measurements on thin films of NdNiO3 reveal a crossover to a regime of pronounced nonlinear conduction below the well-known metal-insulator transition temperature. The evolution of the transport properties at temperatures well below this transition appears consistent with a gradual formation of a gap in the holelike Fermi surface of this strongly correlated system. As T is decreased below the nominal transition temperature, transport becomes increasingly non-Ohmic, with a model of Landau-Zener breakdown becoming most suited for describing I(V) characteristics as the temperature approaches 2 K.

关键词： ELLIPSOMETRY THIN films NANOSTRUCTURED materials SOLID state electronics MAGNETRON sputtering

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Calibrated Langevin-dynamics simulations of intrinsically disordered proteins

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Physical Review E 2014年第4期90卷 042709-042709页

作者： W. Wendell Smith Po-Yi Ho Corey S. O'Hern Department of Physics Yale University New Haven Connecticut 06520-8120 USA Integrated Graduate Program in Physical and Engineering Biology Yale University New Haven Connecticut 06520-8114 USA Department of Mechanical Engineering and Materials Science Yale University New Haven Connecticut 06520-8286 USA Department of Applied Physics Yale University New Haven Connecticut 06520-8267 USA Program in Computational Biology and Bioinformatics Yale University New Haven Connecticut 06520 USA

We perform extensive coarse-grained (CG) Langevin dynamics simulations of intrinsically disordered proteins (IDPs), which possess fluctuating conformational statistics between that for excluded volume random walks and collapsed globules. Our CG model includes repulsive steric, attractive hydrophobic, and electrostatic interactions between residues and is calibrated to a large collection of single-molecule fluorescence resonance energy transfer data on the interresidue separations for 36 pairs of residues in five IDPs: α−, β−, and γ-synuclein, the microtubule-associated protein τ, and prothymosin α. We find that our CG model is able to recapitulate the average interresidue separations regardless of the choice of the hydrophobicity scale, which shows that our calibrated model can robustly capture the conformational dynamics of IDPs. We then employ our model to study the scaling of the radius of gyration with chemical distance in 11 known IDPs. We identify a strong correlation between the distance to the dividing line between folded proteins and IDPs in the mean charge and hydrophobicity space and the scaling exponent of the radius of gyration with chemical distance along the protein.

关键词： LANGEVIN equations SIMULATION methods & models CONFORMATIONAL analysis MICROTUBULE-associated proteins HYDROPHOBIC compounds

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ϕ meson production in the forward/backward rapidity region in Cu + Au collisions at sNN=200 GeV

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Physical Review C 2016年第2期93卷 024904-024904页

作者： A. Adare C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto J. Alexander M. Alfred H. Al-Ta'ani K. R. Andrews A. Angerami K. Aoki N. Apadula E. Appelt Y. Aramaki R. Armendariz H. Asano E. C. Aschenauer E. T. Atomssa T. C. Awes B. Azmoun V. Babintsev M. Bai X. Bai N. S. Bandara B. Bannier K. N. Barish B. Bassalleck A. T. Basye S. Bathe V. Baublis C. Baumann S. Baumgart A. Bazilevsky M. Beaumier S. Beckman R. Belmont J. Ben-Benjamin R. Bennett A. Berdnikov Y. Berdnikov D. Black D. S. Blau J. S. Bok K. Boyle M. L. Brooks D. Broxmeyer J. Bryslawskyj H. Buesching V. Bumazhnov G. Bunce S. Butsyk S. Campbell P. Castera C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi S. Choi R. K. Choudhury P. Christiansen T. Chujo O. Chvala V. Cianciolo Z. Citron B. A. Cole Z. Conesa del Valle M. Connors N. Cronin N. Crossette M. Csanád T. Csörgő S. Dairaku T. W. Danley A. Datta M. S. Daugherity G. David M. K. Dayananda K. DeBlasio K. Dehmelt A. Denisov A. Deshpande E. J. Desmond K. V. Dharmawardane O. Dietzsch L. Ding A. Dion P. B. Diss J. H. Do M. Donadelli L. D'Orazio O. Drapier A. Drees K. A. Drees J. M. Durham A. Durum Y. V. Efremenko T. Engelmore A. Enokizono H. En'yo S. Esumi K. O. Eyser B. Fadem N. Feege D. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin J. E. Frantz A. Franz A. D. Frawley Y. Fukao T. Fusayasu K. Gainey C. Gal P. Gallus P. Garg A. Garishvili I. Garishvili H. Ge F. Giordano A. Glenn X. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp Y. Gu T. Gunji L. Guo H. Guragain H.-Å. Gustafsson T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki J. Hamblen H. F. Hamilton R. Han S. Y. Han J. Hanks C. Harper S. Hasegawa T. O. S. Haseler K. Hashimoto E. Haslum R. Hayano X. He T. K. Hemmick T. Hester J. C. Hill R. S. Hollis W. Holzmann K. Homma B. Hong T. Horaguchi Y. Hori D. Hornback T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara R. Ichimiya H. Iinuma Y. Ikeda K. Imai Y. Imazu M. Inaba A. Iordanova D. Isenhower M. Ishihara A. Isinhue M. Issah D. Ivanishchev Y. Iwanaga B. V. Jacak University of Colorado Boulder Colorado 80309 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Department of Physics and Astronomy Howard University Washington DC 20059 USA New Mexico State University Las Cruces New Mexico 88003 USA Abilene Christian University Abilene Texas 79699 USA Columbia University New York New York 10027 USA and Nevis Laboratories Irvington New York 10533 USA KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan Iowa State University Ames Iowa 50011 USA Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA Vanderbilt University Nashville Tennessee 37235 USA University of California-Riverside Riverside California 92521 USA Kyoto University Kyoto 606-8502 Japan Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA Science and Technology on Nuclear Data Laboratory China Institute of Atomic Energy Beijing 102413 People's Republic of China Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA University of New Mexico Albuquerque New Mexico 87131 USA Baruch College City University of New York New York New York 10010 USA PNPI Petersburg Nuclear Physics Institut

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured ϕ meson production and its nuclear modification in asymmetric Cu+Au heavy-ion collisions at sNN=200 GeV at both forward Cu-going direction (1.2... 详细信息

关键词： Particle & resonance production Relativistic heavy-ion collisions

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Evaluation of Performance and Stability of an MR Compatible PET Detector

Evaluation of Performance and Stability of an MR Compatible ...

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IEEE Nuclear Science Symposium

作者： Ehsan Shams Jonathan D. Thiessen Daryl Bishop Piotr Kozlowski Fabrice Retiere Muhammad Salman Khan Vesna Sossi Greg Stortz Christopher J. Thompson Andrew L. Goertzen Graduate Program in Biomedical Engineering University of Manitoba Lawson Health Research Institute and the University of Western Ontario Detector Development Group TRIUMF Department of Radiology University of British Columbia Department of Electrical and Computer Engineering University of Manitoba Department of Physics & Astronomy University of British Columbia McConnell Brain Imaging Centre Montreal Neurological Institute Department of Radiology and the Department of Physics & Astronomy University of Manitoba

ISBN: (纸本)9781479960989

We have developed an MR compatible PET insert prototype to enable simultaneous PET-MR imaging of small animals inside a 7T animal MR imaging system. The 16 detectors in this system are based on the SensL SPMArray4B silicon photomultipliers (SiPMs) and dual layer offset LYSO crystal blocks with crystal size of 1.2 × 1.2 × 4 mm~3 in the top layer and 1.2 × 1.2 × 6 mm~3 in the bottom layer, with 409 total crystals per detector. Each detector was evaluated by generating flood histogram images and measuring per-crystal photopeak amplitude and energy resolution. The system was tested for MR compatibility and no visible artefacts were seen in the MR images or in the PET detector flood images. The temperature of the detector modules was monitored and found to stabilize after approximately two hours of operation between 32℃ and 34℃. Photopeak amplitude, energy resolution and count rates recorded per crystal were studied at a baseline temperature of 30℃ and at temperatures ranging from 20℃ to 40℃ in increments of 2℃. When bias voltage to the detectors was fixed at the value corresponding to an overvoltage of 2.5V at 30℃, the photopeak amplitude changed by as much as 19% and 28% at 20℃ and 40℃ respectively. Energy resolution and count rates demonstrated similar degrees of change. Maintaining a fixed overvoltage at each temperature point reduced but did not completely eliminate the change in these output characteristics. A lookup table based on empirical measurements was employed for the adjustment of bias voltage at different temperatures to maximize the stability of detector modules. Measurements obtained by using this lookup table method demonstrate better stability when compared to results obtained by using a fixed overvoltage.

关键词： Detectors Temperature measurement Positron emission tomography Crystals Temperature sensors Voltage control Temperature distribution

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Measurement of Long-Range Angular Correlation and Quadrupole Anisotropy of Pions and (Anti)Protons in Central d+Au Collisions at sNN=200 GeV

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Physical Review Letters 2015年第19期114卷 192301-192301页

作者： A. Adare C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto H. Al-Bataineh H. Al-Ta’ani J. Alexander K. R. Andrews A. Angerami K. Aoki N. Apadula E. Appelt Y. Aramaki R. Armendariz E. C. Aschenauer E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay B. Bannier K. N. Barish B. Bassalleck A. T. Basye S. Bathe V. Baublis C. Baumann A. Bazilevsky S. Belikov R. Belmont J. Ben-Benjamin R. Bennett J. H. Bhom D. S. Blau J. S. Bok K. Boyle M. L. Brooks D. Broxmeyer H. Buesching V. Bumazhnov G. Bunce S. Butsyk S. Campbell A. Caringi P. Castera C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi R. K. Choudhury P. Christiansen T. Chujo P. Chung O. Chvala V. Cianciolo Z. Citron B. A. Cole Z. Conesa del Valle M. Connors M. Csanád T. Csörgő T. Dahms S. Dairaku I. Danchev K. Das A. Datta G. David M. K. Dayananda A. Denisov A. Deshpande E. J. Desmond K. V. Dharmawardane O. Dietzsch A. Dion M. Donadelli O. Drapier A. Drees K. A. Drees J. M. Durham A. Durum D. Dutta L. D’Orazio S. Edwards Y. V. Efremenko F. Ellinghaus T. Engelmore A. Enokizono H. En’yo S. Esumi B. Fadem D. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao T. Fusayasu C. Gal I. Garishvili A. Glenn H. Gong X. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene G. Grim M. Grosse Perdekamp T. Gunji L. Guo H.-Å. Gustafsson J. S. Haggerty K. I. Hahn H. Hamagaki J. Hamblen R. Han J. Hanks C. Harper K. Hashimoto E. Haslum R. Hayano X. He M. Heffner T. K. Hemmick T. Hester J. C. Hill M. Hohlmann R. S. Hollis W. Holzmann K. Homma B. Hong T. Horaguchi Y. Hori D. Hornback S. Huang T. Ichihara R. Ichimiya H. Iinuma Y. Ikeda K. Imai M. Inaba A. Iordanova D. Isenhower M. Ishihara M. Issah D. Ivanischev Y. Iwanaga B. V. Jacak J. Jia X. Jiang J. Jin D. John B. M. Johnson T. Jones K. S. Joo D. Jouan D. S. Jumper F. Kajihara J. Kamin S. Kaneti B. H. Kang J. H. Kang J. S. Kang J. Kapustinsky K. Karatsu M. Kasai D. Kawall M. Kawashima A. V. Kazantsev T. Kempel A. Kh University of Colorado Boulder Colorado 80309 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan New Mexico State University Las Cruces New Mexico 88003 USA Abilene Christian University Abilene Texas 79699 USA Columbia University New York New York 10027 USA and Nevis Laboratories Irvington New York 10533 USA Kyoto University Kyoto 606-8502 Japan Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA Vanderbilt University Nashville Tennessee 37235 USA University of California–Riverside Riverside California 92521 USA Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA Florida Institute of Technology Melbourne Florida 32901 USA University of New Mexico Albuquerque New Mexico 87131 USA Baruch College City University of New York New York New York 10010 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Institut fur Kernphysik University of Muenster D-48149 Muenster Germany Muhlenberg College Allentown Pennsylvania 18104-5

We present azimuthal angular correlations between charged hadrons and energy deposited in calorimeter towers in central d+Au and minimum bias p+p collisions at sNN=200 GeV. The charged hadron is measured at midrapidity |η|<0.35, and the energy is measured at large rapidity (−3.7<η<−3.1, Au-going direction). An enhanced near-side angular correlation across |Δη|>2.75 is observed in d+Au collisions. Using the event plane method applied to the Au-going energy distribution, we extract the anisotropy strength v2 for inclusive charged hadrons at midrapidity up to pT=4.5 GeV/c. We also present the measurement of v2 for identified π± and (anti)protons in central d+Au collisions, and observe a mass-ordering pattern similar to that seen in heavy-ion collisions. These results are compared with viscous hydrodynamic calculations and measurements from p+Pb at sNN=5.02 TeV. The magnitude of the mass ordering in d+Au is found to be smaller than that in p+Pb collisions, which may indicate smaller radial flow in lower energy d+Au collisions.

关键词： ANGULAR correlations (Nuclear physics) QUADRUPOLES ANISOTROPY PIONS PROTONS

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Atomic and electronic structures of single-layer FeSe on SrTiO3(001): The role of oxygen deficiency

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Physical Review B 2013年第22期87卷 220503(R)-220503(R)页

作者： Junhyeok Bang Zhi Li Y. Y. Sun Amit Samanta Y. Y. Zhang Wenhao Zhang Lili Wang X. Chen Xucun Ma Q.-K. Xue S. B. Zhang Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute Troy New York 12180 USA Institute of Physics The Chinese Academy of Sciences Beijing 100190 China Program in Applied and Computational Mathematics Princeton University Princeton New Jersey 08544 USA Department of Physics Tsinghua University Beijing 100084 China

Using first-principles calculation, we propose an interface structure for single triple-layer FeSe on the SrTiO3(001) surface, a high-Tc superconductor found recently. The key component of this structure is the oxygen deficiency on the top layer of the SrTiO3 substrate, as a result of Se etching used in preparing the high-Tc samples. The O vacancies strongly bind the FeSe triple layer to the substrate giving rise to a (2×1) reconstruction, as observed by scanning tunneling microscopy. The enhanced binding correlates to the significant increase of Tc observed in experiment. The O vacancies also serve as the source of electron doping, which modifies the Fermi surface of the first FeSe layer by filling the hole pocket near the center of the surface Brillouin zone, as suggested from angle-resolved photoemission spectroscopy measurement.

关键词： ELECTRONIC structure SCANNING probe microscopy PARTICLES (Nuclear physics) WAVE mechanics ELECTRIC properties of crystals

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Systematic study of charged-pion and kaon femtoscopy in Au + Au collisions at sNN=200 GeV

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Physical Review C 2015年第3期92卷 034914-034914页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba H. Al-Bataineh J. Alexander M. Alfred K. Aoki N. Apadula Y. Aramaki H. Asano E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay N. S. Bandara B. Bannier K. N. Barish B. Bassalleck A. T. Basye S. Bathe V. Baublis C. Baumann A. Bazilevsky M. Beaumier S. Beckman S. Belikov R. Belmont R. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley D. S. Blau J. S. Bok K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi R. K. Choudhury P. Christiansen T. Chujo P. Chung O. Chvala V. Cianciolo Z. Citron B. A. Cole M. Connors P. Constantin M. Csanád T. Csörgő T. Dahms S. Dairaku I. Danchev D. Danley K. Das A. Datta M. S. Daugherity G. David K. DeBlasio K. Dehmelt A. Denisov A. Deshpande E. J. Desmond O. Dietzsch A. Dion P. B. Diss J. H. Do M. Donadelli O. Drapier A. Drees K. A. Drees J. M. Durham A. Durum D. Dutta S. Edwards Y. V. Efremenko F. Ellinghaus T. Engelmore A. Enokizono H. En'yo S. Esumi B. Fadem N. Feege D. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao T. Fusayasu C. Gal P. Gallus P. Garg I. Garishvili H. Ge F. Giordano A. Glenn H. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji H.-Å. Gustafsson T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki J. Hamblen H. F. Hamilton R. Han S. Y. Han J. Hanks E. P. Hartouni S. Hasegawa T. O. S. Haseler K. Hashimoto E. Haslum R. Hayano X. He M. Heffner T. K. Hemmick T. Hester J. C. Hill M. Hohlmann R. S. Hollis W. Holzmann K. Homma B. Hong T. Horaguchi D. Hornback T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara R. Ichimiya J. Ide Y. Ikeda K. Imai M. Inaba A. Iordanova D. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov D. Ivanishchev B. V. Jacak M. Jezghani J. Jia X. Jiang J. Jin B. M. Johnson K. S. Joo D. Jouan D. S. Jumper F. Kajihara S. Kametani N. Kamihara University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA New Mexico State University Las Cruces New Mexico 88003 USA Department of Physics and Astronomy Howard University Washington DC 20059 USA KEK High Energy Accelerator Research Organization Tsukuba Ibaraki 305-0801 Japan Kyoto University Kyoto 606-8502 Japan Iowa State University Ames Iowa 50011 USA Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA Florida Institute of Technology Melbourne Florida 32901 USA University of California-Riverside Riverside California 92521 USA University of New Mexico Albuquerque New Mexico 87131 USA Abilene Christian University Abilene Texas 79699 USA Baruch College City University of New York New York New York 10010 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad Region 188300 Russia Institut für Kernphysik University of Muenster D-48149 Muenster

We present a systematic study of charged-pion and kaon interferometry in Au+Au collisions at sNN=200 GeV. The kaon mean source radii are found to be larger than pion radii in the outward and longitudinal directions for the same transverse mass; this difference increases for more central collisions. The azimuthal-angle dependence of the radii was measured with respect to the second-order event plane and similar oscillations of the source radii were found for pions and kaons. Hydrodynamic models qualitatively describe the similar oscillations of the mean source radii for pions and kaons, but they do not fully describe the transverse-mass dependence of the oscillations.

关键词： Pions Femtoscopy Kaons -- Scattering Scattering (physics) Pump probe spectroscopy

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Charged-pion cross sections and double-helicity asymmetries in polarized p+p collisions at s=200 GeV

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Physical Review D 2015年第3期91卷 032001-032001页

作者： A. Adare C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto H. Al-Ta’ani J. Alexander K. R. Andrews A. Angerami K. Aoki N. Apadula E. Appelt Y. Aramaki R. Armendariz E. C. Aschenauer E. T. Atomssa T. C. Awes B. Azmoun V. Babintsev M. Bai B. Bannier K. N. Barish B. Bassalleck A. T. Basye S. Bathe V. Baublis C. Baumann A. Bazilevsky R. Belmont J. Ben-Benjamin R. Bennett D. S. Blau J. S. Bok K. Boyle M. L. Brooks D. Broxmeyer H. Buesching V. Bumazhnov G. Bunce S. Butsyk S. Campbell P. Castera C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi R. K. Choudhury P. Christiansen T. Chujo O. Chvala V. Cianciolo Z. Citron B. A. Cole Z. Conesa del Valle M. Connors M. Csanád T. Csörgő S. Dairaku A. Datta G. David M. K. Dayananda A. Denisov A. Deshpande E. J. Desmond K. V. Dharmawardane O. Dietzsch A. Dion M. Donadelli O. Drapier A. Drees K. A. Drees J. M. Durham A. Durum L. D’Orazio Y. V. Efremenko T. Engelmore A. Enokizono H. En’yo S. Esumi B. Fadem D. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin J. E. Frantz A. Franz A. D. Frawley Y. Fukao T. Fusayasu C. Gal I. Garishvili F. Giordano A. Glenn X. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji L. Guo H.-Å. Gustafsson J. S. Haggerty K. I. Hahn H. Hamagaki J. Hamblen R. Han J. Hanks C. Harper K. Hashimoto E. Haslum R. Hayano X. He T. K. Hemmick T. Hester J. C. Hill R. S. Hollis W. Holzmann K. Homma B. Hong T. Horaguchi Y. Hori D. Hornback S. Huang T. Ichihara R. Ichimiya H. Iinuma Y. Ikeda K. Imai M. Inaba A. Iordanova D. Isenhower M. Ishihara M. Issah D. Ivanischev Y. Iwanaga B. V. Jacak J. Jia X. Jiang D. John B. M. Johnson T. Jones K. S. Joo D. Jouan J. Kamin S. Kaneti B. H. Kang J. H. Kang J. S. Kang J. Kapustinsky K. Karatsu M. Kasai D. Kawall A. V. Kazantsev T. Kempel A. Khanzadeev K. M. Kijima B. I. Kim D. J. Kim E.-J. Kim Y.-J. Kim Y. K. Kim E. Kinney Á. Kiss E. Kistenev D. Kleinjan P. Kline L. Kochenda B. Komkov M. Konno J. Koster D. Kotov A. Král G. J. Kunde K. Kurita M. Kurosawa Y. Kwon G. S. Kyle R. Lacey Y. University of Colorado Boulder Colorado 80309 USA Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan New Mexico State University Las Cruces New Mexico 88003 USA Abilene Christian University Abilene Texas 79699 USA Columbia University New York New York 10027 USA and Nevis Laboratories Irvington New York 10533 USA Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA Vanderbilt University Nashville Tennessee 37235 USA University of California - Riverside Riverside California 92521 USA Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA University of New Mexico Albuquerque New Mexico 87131 USA Baruch College City University of New York New York New York 10010 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad Region 188300 Russia Institut fur Kernphysik University of Muenster D-48149 Muenster Germany Muhlenberg College Allentown Pennsylvania 18104-5586 USA Russian Research Center “Kurchatov Institute” Moscow 123098 Russia Yonsei University IPAP Seoul 120-749 Korea University of Illinois at Urbana-Champaign Urbana Illinois 61801 USA Chonbuk National University Jeonju 561-756 Korea Bhabha Atomic Research Centre Bombay 400 085 Indi

We present midrapidity charged-pion invariant cross sections, the ratio of the π− to π+ cross sections and the charge-separated double-spin asymmetries in polarized p+p collisions at s=200 GeV. While the cross section measurements are consistent within the errors of next-to-leading-order (NLO) perturbative quantum chromodynamics predictions (pQCD), the same calculations overestimate the ratio of the charged-pion cross sections. This discrepancy arises from the cancellation of the substantial systematic errors associated with the NLO-pQCD predictions in the ratio and highlights the constraints these data will place on flavor-dependent pion fragmentation functions. The charge-separated pion asymmetries presented here sample an x range of ∼0.03–0.16 and provide unique information on the sign of the gluon-helicity distribution.

关键词： PIONS RESEARCH POLARIZATION (Nuclear physics) GLUONS QUANTUM chromodynamics PERTURBATION (Quantum dynamics)

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Centrality dependence of low-momentum direct-photon production in Au+Au collisions at sNN=200 GeV

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Physical Review C 2015年第6期91卷 064904-064904页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto H. Al-Bataineh H. Al-Ta'ani J. Alexander A. Angerami K. Aoki N. Apadula Y. Aramaki H. Asano E. C. Aschenauer E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay B. Bannier K. N. Barish B. Bassalleck A. T. Basye S. Bathe V. Baublis C. Baumann S. Baumgart A. Bazilevsky S. Belikov R. Belmont R. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley X. Bing D. S. Blau J. S. Bok K. Boyle M. L. Brooks H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell P. Castera C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi S. Choi R. K. Choudhury P. Christiansen T. Chujo P. Chung O. Chvala V. Cianciolo Z. Citron B. A. Cole M. Connors P. Constantin M. Csanád T. Csörgő T. Dahms S. Dairaku I. Danchev K. Das A. Datta M. S. Daugherity G. David A. Denisov A. Deshpande E. J. Desmond K. V. Dharmawardane O. Dietzsch L. Ding A. Dion M. Donadelli O. Drapier A. Drees K. A. Drees J. M. Durham A. Durum D. Dutta L. D'Orazio S. Edwards Y. V. Efremenko F. Ellinghaus T. Engelmore A. Enokizono H. En'yo S. Esumi K. O. Eyser B. Fadem D. E. Fields M. Finger M. Finger, Jr. F. Fleuret S. L. Fokin Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao T. Fusayasu K. Gainey C. Gal A. Garishvili I. Garishvili A. Glenn H. Gong X. Gong M. Gonin Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji L. Guo H.-Å. Gustafsson T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki J. Hamblen R. Han J. Hanks E. P. Hartouni K. Hashimoto E. Haslum R. Hayano X. He M. Heffner T. K. Hemmick T. Hester J. C. Hill M. Hohlmann R. S. Hollis W. Holzmann K. Homma B. Hong T. Horaguchi Y. Hori D. Hornback S. Huang T. Ichihara R. Ichimiya J. Ide H. Iinuma Y. Ikeda K. Imai J. Imrek M. Inaba A. Iordanova D. Isenhower M. Ishihara T. Isobe M. Issah A. Isupov D. Ivanischev D. Ivanishchev B. V. Jacak M. Javani J. Jia X. Jiang J. Jin B. M. Johnson K. S. Joo D. Jouan D. S. Jumper F. Kajihara S. Kametani N. Kamihara J. Kamin S. Kaneti B. H University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 USA Department of Physics University of Michigan Ann Arbor Michigan 48109-1040 USA Chemistry Department Stony Brook University SUNY Stony Brook New York 11794-3400 USA RIKEN Nishina Center for Accelerator-Based Science Wako Saitama 351-0198 Japan RIKEN BNL Research Center Brookhaven National Laboratory Upton New York 11973-5000 USA Center for Nuclear Study Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan New Mexico State University Las Cruces New Mexico 88003 USA Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 USA Kyoto University Kyoto 606-8502 Japan Department of Physics and Astronomy Stony Brook University SUNY Stony Brook New York 11794-3800 USA Physics Department Brookhaven National Laboratory Upton New York 11973-5000 USA Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS-IN2P3 Route de Saclay F-91128 Palaiseau France Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA IHEP Protvino State Research Center of Russian Federation Institute for High Energy Physics Protvino 142281 Russia Collider-Accelerator Department Brookhaven National Laboratory Upton New York 11973-5000 USA Florida Institute of Technology Melbourne Florida 32901 USA University of California - Riverside Riverside California 92521 USA University of New Mexico Albuquerque New Mexico 87131 USA Abilene Christian University Abilene Texas 79699 USA Baruch College City University of New York New York New York 10010 and The Graduate Center City University of New York New York New York 10016 USA PNPI Petersburg Nuclear Physics Institute Gatchina Leningrad region 188300 Russia Institut fur Kernphysik Un

The PHENIX experiment at RHIC has measured the centrality dependence of the direct photon yield from Au+Au collisions at sNN=200 GeV down to pT=0.4 GeV/c. Photons are detected via photon conversions to e+e− pairs and an improved technique is applied that minimizes the systematic uncertainties that usually limit direct photon measurements, in particular at low pT. We find an excess of direct photons above the Ncoll-scaled yield measured in p+p collisions. This excess yield is well described by an exponential distribution with an inverse slope of about 240MeV/c in the pT range 0.6–2.0 GeV/c. While the shape of the pT distribution is independent of centrality within the experimental uncertainties, the yield increases rapidly with increasing centrality, scaling approximately with Npartα, where α=1.38±0.03(stat)±0.07(syst).

关键词： GOLD HEAVY ion collisions PHOTON emission PAIR production ANGULAR momentum (Nuclear physics) CROSS sections (Nuclear physics)

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