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Forward J/ψ production in U + U collisions at sNN=193 GeV

Physical Review C 2016年第3期93卷 034903-034903页

作者： A. Adare C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto J. Alexander M. Alfred K. Aoki N. Apadula H. Asano E. T. Atomssa T. C. Awes B. Azmoun V. Babintsev M. Bai X. Bai N. S. Bandara B. Bannier K. N. Barish S. Bathe V. Baublis C. Baumann S. Baumgart A. Bazilevsky M. Beaumier S. Beckman R. Belmont A. Berdnikov Y. Berdnikov D. Black D. S. Blau J. S. Bok K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov S. Butsyk S. Campbell C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi S. Choi P. Christiansen T. Chujo V. Cianciolo Z. Citron B. A. Cole N. Cronin N. Crossette M. Csanád T. Csörgő T. W. Danley A. Datta M. S. Daugherity G. David K. DeBlasio K. Dehmelt A. Denisov A. Deshpande E. J. Desmond L. Ding A. Dion P. B. Diss J. H. Do L. D'Orazio O. Drapier A. Drees K. A. Drees J. M. Durham A. Durum T. Engelmore A. Enokizono 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 H. Guragain T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki H. F. Hamilton S. Y. Han J. Hanks S. Hasegawa T. O. S. Haseler K. Hashimoto R. Hayano X. He T. K. Hemmick T. Hester J. C. Hill R. S. Hollis K. Homma B. Hong T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara Y. Ikeda K. Imai Y. Imazu M. Inaba A. Iordanova D. Isenhower A. Isinhue D. Ivanishchev B. V. Jacak S. J. Jeon M. Jezghani J. Jia X. Jiang B. M. Johnson K. S. Joo D. Jouan D. S. Jumper J. Kamin S. Kanda B. H. Kang J. H. Kang J. S. Kang J. Kapustinsky D. Kawall A. V. Kazantsev J. A. Key V. Khachatryan P. K. Khandai A. Khanzadeev K. M. Kijima C. Kim D. J. Kim E.-J. Kim G. W. Kim M. Kim Y.-J. Kim Y. K. Kim B. Kimelman E. Kistenev R. Kitamura J. Klatsky D. Kleinjan P. Kline T. Koblesky M. Kofarago B. Komkov J. Koster D. Kotchetkov D. Kotov F. Krizek K. Kurita M. Kurosawa Y. Kwon R. Lacey 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 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 Kyoto University Kyoto 606-8502 Japan 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 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 California-Riverside Riverside California 92521 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 National Research Center “Kurchatov Institute” Moscow 123098 Russia New Mexico State University Las Cruces New Mexico 88003 USA University of New Mexico Alb

The invariant yields, dN/dy, for J/ψ production at forward rapidity (1.2<|y|<2.2) in U+U collisions at sNN=193GeV have been measured as a function of collision centrality. The invariant yields and nuclear-modification factor RAA are presented and compared with those from Au+Au collisions in the same rapidity range. Additionally, the direct ratio of the invariant yields from U+U and Au+Au collisions within the same centrality class is presented, and used to investigate the role of cc¯ coalescence. Two different parametrizations of the deformed Woods-Saxon distribution were used in Glauber calculations to determine the values of the number of nucleon-nucleon collisions in each centrality class, Ncoll, and these were found to give significantly different Ncoll values. Results using Ncoll values from both deformed Woods-Saxon distributions are presented. The measured ratios show that the J/ψ suppression, relative to binary collision scaling, is similar in U+U and Au+Au for peripheral and midcentral collisions, but that J/ψ show less suppression for the most central U+U collisions. The results are consistent with a picture in which, for central collisions, increase in the J/ψ yield due to cc¯ coalescence becomes more important than the decrease in yield due to increased energy density. For midcentral collisions, the conclusions about the balance between cc¯ coalescence and suppression depend on which deformed Woods-Saxon distribution is used to determine Ncoll.

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

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Measurements of directed, elliptic, and triangular flow in Cu + Au collisions at sNN=200 GeV

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Physical Review C 2016年第5期94卷 054910-054910页

作者： A. Adare C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto J. Alexander M. Alfred K. Aoki N. Apadula H. Asano E. T. Atomssa T. C. Awes B. Azmoun V. Babintsev M. Bai X. Bai N. S. Bandara B. Bannier K. N. Barish S. Bathe V. Baublis C. Baumann S. Baumgart A. Bazilevsky M. Beaumier S. Beckman R. Belmont A. Berdnikov Y. Berdnikov D. Black D. S. Blau J. S. Bok K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov S. Butsyk S. Campbell C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi S. Choi P. Christiansen T. Chujo V. Cianciolo Z. Citron B. A. Cole N. Cronin N. Crossette M. Csanád T. Csörgő T. W. Danley A. Datta M. S. Daugherity G. David K. DeBlasio K. Dehmelt A. Denisov A. Deshpande E. J. Desmond L. Ding A. Dion P. B. Diss J. H. Do L. D'Orazio O. Drapier A. Drees K. A. Drees J. M. Durham A. Durum T. Engelmore A. Enokizono 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 H. Guragain T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki H. F. Hamilton S. Y. Han J. Hanks S. Hasegawa T. O. S. Haseler K. Hashimoto R. Hayano X. He T. K. Hemmick T. Hester J. C. Hill R. S. Hollis K. Homma B. Hong T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara Y. Ikeda K. Imai Y. Imazu M. Inaba A. Iordanova D. Isenhower A. Isinhue D. Ivanishchev B. V. Jacak S. J. Jeon M. Jezghani J. Jia X. Jiang B. M. Johnson K. S. Joo D. Jouan D. S. Jumper J. Kamin S. Kanda B. H. Kang J. H. Kang J. S. Kang J. Kapustinsky D. Kawall A. V. Kazantsev J. A. Key V. Khachatryan P. K. Khandai A. Khanzadeev K. M. Kijima C. Kim D. J. Kim E.-J. Kim G. W. Kim M. Kim Y.-J. Kim Y. K. Kim B. Kimelman E. Kistenev R. Kitamura J. Klatsky D. Kleinjan P. Kline T. Koblesky M. Kofarago B. Komkov J. Koster D. Kotchetkov D. Kotov F. Krizek K. Kurita M. Kurosawa Y. Kwon R. Lacey 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 D.C. 20059 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 Kyoto University Kyoto 606-8502 Japan 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 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 California-Riverside Riverside California 92521 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 National Research Center “Kurchatov Institute ” Moscow 123098 Russia New Mexico State University Las Cruces New Mexico 88003 USA University of New Mexico A

Measurements of anisotropic flow Fourier coefficients (vn) for inclusive charged particles and identified hadrons π±, K±, p, and p¯ produced at midrapidity in Cu+Au collisions at sNN=200 GeV are presented. The data were collected in 2012 by the PHENIX experiment at the Relativistic Heavy-Ion Collider (RHIC). The particle azimuthal distributions with respect to different-order symmetry planes Ψn, for n=1, 2, and 3 are studied as a function of transverse momentum pT over a broad range of collision centralities. Mass ordering, as expected from hydrodynamic flow, is observed for all three harmonics. The charged-particle results are compared with hydrodynamical and transport model calculations. We also compare these Cu+Au results with those in Cu+Cu and Au+Au collisions at the same sNN and find that the v2 and v3, as a function of transverse momentum, follow a common scaling with 1/(ɛnNpart1/3).

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

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Inclusive cross section and double-helicity asymmetry for π0 production at midrapidity in p+p collisions at s=510 GeV

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Physical Review D 2016年第1期93卷 011501(R)-011501(R)页

作者： A. Adare C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto J. Alexander M. Alfred K. Aoki N. Apadula Y. Aramaki H. Asano E. T. Atomssa T. C. Awes B. Azmoun V. Babintsev M. Bai X. Bai N. S. Bandara B. Bannier K. N. Barish S. Bathe V. Baublis C. Baumann S. Baumgart A. Bazilevsky M. Beaumier S. Beckman R. Belmont A. Berdnikov Y. Berdnikov D. Black D. S. Blau J. S. Bok K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov S. Butsyk S. Campbell C.-H. Chen C. Y. Chi M. Chiu I. J. Choi J. B. Choi S. Choi P. Christiansen T. Chujo V. Cianciolo Z. Citron B. A. Cole N. Cronin N. Crossette M. Csanád T. Csörgő T. W. Danley A. Datta M. S. Daugherity G. David K. DeBlasio K. Dehmelt A. Denisov A. Deshpande E. J. Desmond L. Ding A. Dion P. B. Diss J. H. Do L. D’Orazio O. Drapier A. Drees K. A. Drees J. M. Durham A. Durum 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 H. Guragain T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki H. F. Hamilton S. Y. Han J. Hanks S. Hasegawa T. O. S. Haseler K. Hashimoto R. Hayano X. He T. K. Hemmick T. Hester J. C. Hill R. S. Hollis K. Homma B. Hong T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara Y. Ikeda K. Imai Y. Imazu M. Inaba A. Iordanova D. Isenhower A. Isinhue D. Ivanishchev B. V. Jacak S. J. Jeon M. Jezghani J. Jia X. Jiang B. M. Johnson E. Joo K. S. Joo D. Jouan D. S. Jumper J. Kamin S. Kanda B. H. Kang J. H. Kang J. S. Kang J. Kapustinsky D. Kawall A. V. Kazantsev J. A. Key V. Khachatryan P. K. Khandai A. Khanzadeev K. Kihara K. M. Kijima C. Kim D. H. Kim D. J. Kim E.-J. Kim G. W. Kim H.-J. Kim M. Kim Y.-J. Kim Y. K. Kim B. Kimelman E. Kistenev R. Kitamura J. Klatsky D. Kleinjan P. Kline T. Koblesky M. Kofarago B. Komkov J. Koster D. Kotchetkov D 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 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 Kyoto University Kyoto 606-8502 Japan 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 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 California-Riverside Riverside California 92521 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 National Research Center “Kurchatov Institute ” Moscow 123098 Russia New Mexico State University Las Cruces New Mexico 88003 USA University of New Mexico Albuqu

PHENIX measurements are presented for the cross section and double-helicity asymmetry (ALL) in inclusive π0 production at midrapidity from p+p collisions at s=510 GeV from data taken in 2012 and 2013 at the Relativistic Heavy Ion Collider. The next-to-leading-order perturbative-quantum-chromodynamics theory calculation is in excellent agreement with the presented cross section results. The calculation utilized parton-to-pion fragmentation functions from the recent DSS14 global analysis, which prefer a smaller gluon-to-pion fragmentation function. The π0ALL results follow an increasingly positive asymmetry trend with pT and s with respect to the predictions and are in excellent agreement with the latest global analysis results. This analysis incorporated earlier results on π0 and jet ALL and suggested a positive contribution of gluon polarization to the spin of the proton ΔG for the gluon momentum fraction range x>0.05. The data presented here extend to a currently unexplored region, down to x∼0.01, and thus provide additional constraints on the value of ΔG.

关键词： Hadron-hadron interactions Pions Protons Hadron colliders

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Dielectron production in Au + Au collisions at sNN=200 GeV

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Physical Review C 2016年第1期93卷 014904-014904页

作者： A. Adare C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto J. Alexander M. Alfred H. Al-Ta'ani 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 N. S. Bandara B. Bannier K. N. Barish B. Bassalleck S. Bathe V. Baublis S. Baumgart A. Bazilevsky M. Beaumier S. Beckman R. Belmont A. Berdnikov Y. Berdnikov D. S. Blau J. S. Bok K. Boyle M. L. Brooks J. Bryslawskyj 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 T. W. Danley A. Datta M. S. Daugherity G. David 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 S. Edwards Y. V. Efremenko T. Engelmore A. Enokizono 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 T. Gunji L. Guo H.-Å. Gustafsson T. Hachiya J. S. Haggerty K. I. Hahn H. Hamagaki H. F. Hamilton S. Y. Han J. Hanks 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 K. Homma B. Hong T. Horaguchi Y. Hori T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara H. Iinuma Y. Ikeda K. Imai J. Imrek M. Inaba A. Iordanova D. Isenhower M. Issah D. Ivanishchev B. V. Jacak M. Javani M. Jezghani J. Jia X. Jiang B. M. Johnson K. S. Joo D. Jouan D. S. Jumper J. Kamin S. Kanda S. Kaneti B. H. Kang J. H. Kang J. S. Kang J. Kapustinsky K. Karatsu M. Kasai D. Kawall A. V. Kazantsev T. Kempel J. A. Key V. Khachatryan A. Khanzadeev K. M. Kijima B. I. Kim C. Kim D 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 Columbia University New York New York 10027 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 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 Department of Physics University of Massachusetts Amherst Massachusetts 01003-9337 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 National Research Center “Kurchatov Institute ” Moscow 123098 Rus

We present measurements of e+e− production at midrapidity in Au+Au collisions at sNN=200 GeV. The invariant yield is studied within the PHENIX detector acceptance over a wide range of mass (mee<5 GeV/c2) and pair transverse momentum (pT<5 GeV/c) for minimum bias and for five centrality classes. The e+e− yield is compared to the expectations from known sources. In the low-mass region (mee=0.30–0.76 GeV/c2) there is an enhancement that increases with centrality and is distributed over the entire pair pT range measured. It is significantly smaller than previously reported by the PHENIX experiment and amounts to 2.3±0.4(stat)±0.4(syst)±0.2(model) or to 1.7±0.3(stat)±0.3(syst)±0.2(model) for minimum bias collisions when the open heavy-flavor contribution is calculated with pythia or mc@nlo, respectively. The inclusive mass and pT distributions, as well as the centrality dependence, are well reproduced by model calculations where the enhancement mainly originates from the melting of the ρ meson resonance as the system approaches chiral symmetry restoration. In the intermediate-mass region (mee=1.2–2.8 GeV/c2), the data hint at a significant contribution in addition to the yield from the semileptonic decays of heavy-flavor mesons.

关键词： Photon, lepton & quark production Relativistic heavy-ion collisions

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Prospects for Cherenkov telescope array observations of the young supernova remnant RX J1713.7-3946

arXiv

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arXiv 2017年

作者： Acero, F. Aloisio, R. Amans, J. Amato, E. Antonelli, L.A. Aramo, C. Armstrong, T. Arqueros, F. Asano, K. Ashley, M. Backes, M. Balazs, C. Balzer, A. Bamba, A. Barkov, M. Barrio, J.A. Benbow, W. Bernlöhr, K. Beshley, V. Bigongiari, C. Biland, A. Bilinsky, A. Bissaldi, E. Biteau, J. Blanch, O. Blasi, P. Blazek, J. Boisson, C. Bonanno, G. Bonardi, A. Bonavolontà, C. Bonnoli, G. Braiding, C. Brau-Nogué, S. Bregeon, J. Brown, A.M. Bugaev, V. Bulgarelli, A. Bulik, T. Burton, M. Burtovoi, A. Busetto, G. Böttcher, M. Cameron, R. Capalbi, M. Caproni, A. Caraveo, P. Carosi, R. Cascone, E. Cerruti, M. Chaty, S. Chen, A. Chen, X. Chernyakova, M. Chikawa, M. Chudoba, J. Cohen-Tanugi, J. Colafrancesco, S. Conforti, V. Contreras, J.L. Costa, A. Cotter, G. Covino, S. Covone, G. Cumani, P. Cusumano, G. D'Ammando, F. D'Urso, D. Daniel, M. Dazzi, F. de Angelis, A. de Cesare, G. de Franco, A. de Frondat, F. de Gouveia Dal Pino, E.M. de Lisio, C. de los Reyes Lopez, R. de Lotto, B. de Naurois, M. de Palma, F. Del Santo, M. Delgado, C. della Volpe, D. Di Girolamo, T. Di Giulio, C. Di Pierro, F. Di Venere, L. Doro, M. Dournaux, J. Dumas, D. Dwarkadas, V. Díaz, C. Ebr, J. Egberts, K. Einecke, S. Elsässer, D. Eschbach, S. Falceta-Goncalves, D. Fasola, G. Fedorova, E. Fernández-Barral, A. Ferrand, G. Fesquet, M. Fiandrini, E. Fiasson, A. Filipovíc, M.D. Fioretti, V. Font, L. Fontaine, G. Franco, F.J. Freixas Coromina, L. Fujita, Y. Fukui, Y. Funk, S. Förster, A. Gadola, A. Garcia López, R. Garczarczyk, M. Giglietto, N. Giordano, F. Giuliani, A. Glicenstein, J. Gnatyk, R. Goldoni, P. Grabarczyk, T. Graciani, R. Graham, J. Grandi, P. Granot, J. Green, A.J. Griffiths, S. Gunji, S. Hakobyan, H. Hara, S. Hassan, T. Hayashida, M. Heller, M. Helo, J.C. Hinton, J. Hnatyk, B. Huet, J. Huetten, M. Humensky, T.B. Hussein, M. Hörandel, J. Ikeno, Y. Inada, T. Inome, Y. Inoue, S. Inoue, T. Inoue, Y. Ioka, K. Iori, M. Jacquemier, J. Janecek, P. Jankowsky, D. CEA IRFU SAp CEA Saclay Bat 709 Orme des Merisiers Gif-sur-Yvette91191 France Osservatorio Astrofisico di Arcetri Largo E. Fermi 5 Firenze50125 Italy INFN Dipartimento di Scienze Fisiche e Chimiche Università degli Studi dell'Aquila Gran Sasso Science Institute Via Vetoio 1 Viale Crispi 7 L'Aquila67100 Italy LUTH GEPI Observatoire de Paris CNRS PSL Research University 5 place Jules Janssen Meudon92190 France INAF - Osservatorio Astronomico di Roma Via di Frascati 33 Monteporzio Catone00040 Italy INFN Sezione di Napoli Via Cintia ed. G Napoli80126 Italy Dept. of Physics and Centre for Advanced Instrumentation Durham University South Road DurhamDH1 3LE United Kingdom Grupo de Altas Energías Universidad Complutense de Madrid Av Complutense s/n Madrid28040 Spain Institute for Cosmic Ray Research University of Tokyo 5-1-5 Kashi-wanoha Kashiwa Chiba277-8582 Japan School of Physics University of New South Wales SydneyNSW2052 Australia University of Namibia Department of Physics 340 Mandume Ndemufayo Ave. Pioneerspark Windhoek Namibia School of Physics and Astronomy Monash University MelbourneVIC3800 Australia Astronomical Institute Anton Pannekoek University of Amsterdam Science Park Amsterdam904 1098 XH Netherlands Department of Physics Graduate School of Science University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Riken Institute of Physical and Chemical Research 2-1 Hirosawa Wako Saitama351-0198 Japan Harvard-Smithsonian Center for Astrophysics 60 Garden St CambridgeMA02180 United States Max-Planck-Institut für Kernphysik Saupfercheckweg 1 Heidelberg69117 Germany Institute for Applied Problems in Mechanics and Mathematics 3B Naukova Street Lviv79060 Ukraine INAF - Osservatorio Astrofisico di Torino Corso Fiume 4 Torino10133 Italy ETH Zurich Institute for Particle Physics Schafmattstr. 20 ZurichCH-8093 Switzerland Astronomical Observatory of Ivan Franko National University of Lviv 1 Universytetska Stre

We perform simulations for future Cherenkov Telescope Array (CTA) observations of RX J1713.7-3946, a young supernova remnant (SNR) and one of the brightest sources ever discovered in very-high-energy (VHE) gamma rays. Special attention is paid to explore possible spatial (anti-)correlations of gamma rays with emission at other wavelengths, in particular X-rays and CO/Hi emission. We present a series of simulated images of RX J1713.7-3946 for CTA based on a set of observationally motivated models for the gamma-ray emission. In these models, VHE gamma rays produced by high-energy electrons are assumed to trace the non-thermal X-ray emission observed by XMM-Newton, whereas those originating from relativistic protons delineate the local gas distributions. The local atomic and molecular gas distributions are deduced by the NANTEN team from CO and Hi observations. Our primary goal is to show how one can distinguish the emission mechanism(s) of the gamma rays (i.e., hadronic vs leptonic, or a mixture of the two) through information provided by their spatial distribution, spectra, and time variation. This work is the first attempt to quantitatively evaluate the capabilities of CTA to achieve various proposed scientific goals by observing this important cosmic particle accelerator. Copyright © 2017, The Authors. All rights reserved.

关键词： Gamma rays

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North-south anisotropy of galactic cosmic rays observed with the Global Muon Detector Network (GMDN) 34

North-south anisotropy of galactic cosmic rays observed with...

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34th International Cosmic Ray Conference, ICRC 2015

作者： Munakata, K. Kozai, M. Kato, C. Kuwabara, T. Rockenbach, M. Dal Lago, A. Schuch, N.J. Al Jassar, H.K. Sharma, M.M. Duldig, M.L. Humble, J.E. Bieber, J.W. Evenson, P. Sabbah, I. Tokumaru, M. Physics Department Shinshu University Matsumoto Nagano390-8621 Japan Graduate School of Science Chiba University Chiba City Chiba263-8522 Japan P.O. Box 5021 Santa-Maria RS97110-970 Brazil São José dos Campos SP12227-010 Brazil Physics Department Kuwait University P.O. Box 5969 Safat13060 Kuwait School of Physical Sciences University of Tasmania HobartTAS7001 Australia Bartol Research Institute and Department of Physics and Astronomy University of Delaware NewarkDE19716 United States Department of Natural Sciences College of Health Sciences Public Authority of Applied Education and Training Kuwait City72853 Kuwait Solar Terrestrial Environment Laboratory Nagoya University Nagoya Aichi464-8601 Japan

We analyze the north-south anisotropy (NSA) of galactic cosmic rays observed with the GMDN on an hourly basis and compare with the anisotropy derived from the GG-component of a large multidirectional muon detector at Nagoya, Japan. The NSA is a component of the three dimensional anisotropy vector parallel to the Earth's rotation axis. We find a significant seasonal variation of the NSA from the GG-component indicating the influence of the anisotropy component in the ecliptic plane to the NSA. We calculate the average and standard deviation of daily mean NSAs in the 'toward' (T) and 'away' (A) IMF sectors separately in each Carrington Rotation between December 1993 and November 2014. It is confirmed that the temporal variations of the NSA observed with the GMDN and GG-component are consistent with each other, as reported earlier. We find the T-A separation between average NSAs in T and A sectors shows a long-term variation with minima (maxima) around the solar activity minima (maxima). The standard deviation in each rotation also shows a similar long-term variation, keeping the ratio of T-A separation to the standard deviation roughly constant thorough out an entire period of analysis. We discuss this in relation with the 'success rate' which is introduced as a parameter indicating to what extent we can infer the IMF sector polarity from the sign of the observed NSA.

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Average features of the interplanetary shock observed with the Global Muon Detector Network 34

Average features of the interplanetary shock observed with t...

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34th International Cosmic Ray Conference, ICRC 2015

作者： Kozai, M. Munakata, K. Kato, C. Kuwabara, T. Rockenbach, M. Dal Lago, A. Schuch, N.J. Al Jassar, H.K. Sharma, M.M. Duldig, M.L. Humble, J.E. Bieber, J.W. Evenson, P. Sabbah, I. Tokumaru, M. Physics Department Shinshu University Matsumoto Nagano390-8621 Japan Graduate School of Science Chiba University Chiba City Chiba263-8522 Japan P.O. Box 5021 Santa-Maria RS97110-970 Brazil São José dos Campos SP12227-010 Brazil Physics Department Kuwait University P.O. Box 5969 Safat13060 Kuwait School of Physical Sciences University of Tasmania HobartTAS7001 Australia Bartol Research Institute and Department of Physics and Astronomy University of Delaware NewarkDE19716 United States Department of Natural Sciences College of Health Sciences Public Authority of Applied Education and Training Kuwait City72853 Kuwait Solar Terrestrial Environment Laboratory Nagoya University Nagoya Aichi464-8601 Japan

From three-dimensional spatial density gradient of galactic cosmic rays (GCRs) observed with the Global Muon Detector Network (GMDN), we derive average features of the GCR depleted region behind the IP (interplanetary) shock. We identify 207 IP-shocks that passed the earth based on the geomagnetic storm sudden commencements (SSCs) and extract 50 events that are associated with solar coronal mass ejections (CMEs) in a period between 2006 and 2014. From the first order GCR anisotropy corrected for the solar wind convection and Compton-Getting effect arising from the earth's orbital motion, we deduce the density gradient on an hourly basis for each event. We then derive the average temporal variation of the density gradient by superposing its variations at the SSC onset timing. We confirm that the density gradient components are clearly enhanced after the shock passage, indicating the existence of GCR depleted region behind the shock which causes the Forbush Decrease in the cosmic ray intensity. The enhancement of the radial gradient shows longer duration when the earth has encountered the western flank of the shock, implying an asymmetric shielding effect of the shock on the GCRs. The longitudinal gradient, on the other hand, shows that the GCR density minimum is located around the longitudinal center behind the shock, which can be ascribed to the centered ejecta driving IP-shock.

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Transistors: Layer‐by‐Layer Assembled 2D Montmorillonite Dielectrics for Solution‐Processed Electronics (Adv. Mater. 1/2016)

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Advanced Materials 2016年第1期28卷

作者： Jian Zhu Xiaolong Liu Michael L. Geier Julian J. McMorrow Deep Jariwala Megan E. Beck Wei Huang Tobin J. Marks Mark C. Hersam Department of Materials Science and Engineering Northwestern University 2220 Campus Drive Evanston IL 60208 USA Graduate Program in Applied Physics Northwestern University Evanston IL 60208 USA Department of Chemistry Northwestern University Evanston IL 60208 USA Department of Medicine Northwestern University Evanston IL 60208 USA

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Azimuthally anisotropic emission of low-momentum direct photons in Au + Au collisions at sNN=200 GeV

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Physical Review C 2016年第6期94卷 064901-064901页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto H. Al-Bataineh J. Alexander M. Alfred H. Al-Ta'ani 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 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 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 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 T. W. Danley K. Das A. Datta M. S. Daugherity G. David 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 D. Dutta S. Edwards Y. V. Efremenko F. Ellinghaus 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 Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao T. Fusayasu K. Gainey C. Gal P. Gallus P. Garg A. Garishvili I. Garishvili H. Ge F. Giordano 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 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 Y. Hori D. Hornback T. Hoshino N. Hotvedt J. Huang S. Huang T. Ichihara R. Ichimiya J. Ide H. Iinuma Y. Ikeda K. Imai J. Imrek M. Inaba A. Io 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 Department of Physics and Astronomy Howard University Washington D.C. 20059 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 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 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

The PHENIX experiment at the BNL Relativistic Heavy Ion Collider has measured second- and third-order Fourier coefficients of the azimuthal distributions of direct photons emitted at midrapidity in Au+Au collisions at sNN=200 GeV for various collision centralities. Combining two different analysis techniques, results were obtained in the transverse momentum range of 0.4

关键词： Photon, lepton & quark production Relativistic heavy-ion collisions

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Scaling properties of fractional momentum loss of high-pT hadrons in nucleus-nucleus collisions at sNN from 62.4 GeV to 2.76 TeV

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Physical Review C 2016年第2期93卷 024911-024911页

作者： A. Adare S. Afanasiev C. Aidala N. N. Ajitanand Y. Akiba R. Akimoto H. Al-Bataineh J. Alexander M. Alfred H. Al-Ta'ani A. Angerami K. Aoki N. Apadula L. Aphecetche Y. Aramaki R. Armendariz S. H. Aronson J. Asai H. Asano E. C. Aschenauer E. T. Atomssa R. Averbeck T. C. Awes B. Azmoun V. Babintsev M. Bai G. Baksay L. Baksay A. Baldisseri N. S. Bandara B. Bannier K. N. Barish P. D. Barnes B. Bassalleck A. T. Basye S. Bathe S. Batsouli V. Baublis C. Baumann S. Baumgart A. Bazilevsky M. Beaumier S. Beckman S. Belikov R. Belmont R. Bennett A. Berdnikov Y. Berdnikov A. A. Bickley D. S. Blau J. G. Boissevain J. S. Bok H. Borel K. Boyle M. L. Brooks J. Bryslawskyj H. Buesching V. Bumazhnov G. Bunce S. Butsyk C. M. Camacho S. Campbell P. Castera B. S. Chang J.-L. Charvet C.-H. Chen S. Chernichenko C. Y. Chi J. Chiba M. Chiu I. J. Choi J. B. Choi S. Choi R. K. Choudhury P. Christiansen T. Chujo P. Chung A. Churyn O. Chvala V. Cianciolo Z. Citron C. R. Cleven B. A. Cole M. P. Comets M. Connors P. Constantin M. Csanád T. Csörgő T. Dahms S. Dairaku I. Danchev T. W. Danley K. Das A. Datta M. S. Daugherity G. David M. B. Deaton K. DeBlasio K. Dehmelt H. Delagrange A. Denisov D. d'Enterria 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 A. K. Dubey J. M. Durham A. Durum D. Dutta V. Dzhordzhadze S. Edwards Y. V. Efremenko J. Egdemir F. Ellinghaus W. S. Emam 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 Z. Fraenkel J. E. Frantz A. Franz A. D. Frawley K. Fujiwara Y. Fukao T. Fusayasu S. Gadrat K. Gainey C. Gal P. Gallus P. Garg A. Garishvili I. Garishvili H. Ge F. Giordano A. Glenn H. Gong X. Gong M. Gonin J. Gosset Y. Goto R. Granier de Cassagnac N. Grau S. V. Greene M. Grosse Perdekamp T. Gunji L. Guo H.-Å. Gustafsson T. Hachiya A. Hadj Henni C. Haegemann J. S. Haggerty K. I. Hahn H. Hamagaki J. Hamblen H. F. Hamilton R. Han S. Y. Han J. Han University of Colorado Boulder Colorado 80309 USA Joint Institute for Nuclear Research 141980 Dubna Moscow Region Russia Columbia University New York New York 10027 and Nevis Laboratories Irvington New York 10533 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 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 SUBATECH (Ecole des Mines de Nantes CNRS-IN2P3 Université de Nantes) BP 20722-44307 Nantes France 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 Dapnia CEA Saclay F-91191 Gif-sur-Yvette France University of California-Riverside Riverside California 92521 USA University of New Mexic

Measurements of the fractional momentum loss (Sloss≡δpT/pT) of high-transverse-momentum-identified hadrons in heavy-ion collisions are presented. Using π0 in Au+Au and Cu+Cu collisions at sNN=62.4 and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in Pb+Pb collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of Sloss as a function of a number of variables: the number of participants, Npart, the number of quark participants, Nqp, the charged-particle density, dNch/dη, and the Bjorken energy density times the equilibration time, ɛBjτ0. We find that the pT, where Sloss has its maximum, varies both with centrality and collision energy. Above the maximum, Sloss tends to follow a power-law function with all four scaling variables. The data at sNN=200 GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of Sloss with dNch/dη and ɛBjτ0, lending insight into the physics of parton energy loss.

关键词： Hard scattering Relativistic heavy-ion collisions Hadrons Nuclear data analysis & compilation

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