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Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at sqrt[s]=510 GeV in p[over →]+p[over →] Collisions.
Abdulameer, N J; Acharya, U; Adare, A; Aidala, C; Ajitanand, N N; Akiba, Y; Akimoto, R; Alfred, M; Apadula, N; Aramaki, Y; Asano, H; Atomssa, E T; Awes, T C; Azmoun, B; Babintsev, V; Bai, M; Bandara, N S; Bannier, B; Barish, K N; Bathe, S; Bazilevsky, A; Beaumier, M; Beckman, S; Belmont, R; Berdnikov, A; Berdnikov, Y; Bichon, L; Black, D; Blankenship, B; Bok, J S; Borisov, V; Boyle, K; Brooks, M L; Bryslawskyj, J; Buesching, H; Bumazhnov, V; Campbell, S; Canoa Roman, V; Chen, C-H; Chiu, M; Chi, C Y; Choi, I J; Choi, J B; Chujo, T; Citron, Z; Connors, M; Corliss, R; Corrales Morales, Y; Csanád, M; Csörgo, T.
Affiliation
  • Abdulameer NJ; Debrecen University, H-4010 Debrecen, Egyetem tér 1, Hungary.
  • Acharya U; Georgia State University, Atlanta, Georgia 30303, USA.
  • Adare A; University of Colorado, Boulder, Colorado 80309, USA.
  • Aidala C; Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA.
  • Ajitanand NN; Chemistry Department, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USA.
  • Akiba Y; RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan.
  • Akimoto R; RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
  • Alfred M; Center for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
  • Apadula N; Department of Physics and Astronomy, Howard University, Washington, D.C. 20059, USA.
  • Aramaki Y; Iowa State University, Ames, Iowa 50011, USA.
  • Asano H; Department of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3800, USA.
  • Atomssa ET; RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan.
  • Awes TC; Kyoto University, Kyoto 606-8502, Japan.
  • Azmoun B; RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan.
  • Babintsev V; Department of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3800, USA.
  • Bai M; Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
  • Bandara NS; Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
  • Bannier B; IHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino 142281, Russia.
  • Barish KN; Collider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
  • Bathe S; Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003-9337, USA.
  • Bazilevsky A; Department of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3800, USA.
  • Beaumier M; University of California-Riverside, Riverside, California 92521, USA.
  • Beckman S; Baruch College, City University of New York, New York, New York 10010, USA.
  • Belmont R; RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
  • Berdnikov A; Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
  • Berdnikov Y; University of California-Riverside, Riverside, California 92521, USA.
  • Bichon L; University of Colorado, Boulder, Colorado 80309, USA.
  • Black D; University of Colorado, Boulder, Colorado 80309, USA.
  • Blankenship B; Physics and Astronomy Department, University of North Carolina at Greensboro, Greensboro, North Carolina 27412, USA.
  • Bok JS; Saint Petersburg State Polytechnic University, St. Petersburg 195251 Russia.
  • Borisov V; Saint Petersburg State Polytechnic University, St. Petersburg 195251 Russia.
  • Boyle K; Vanderbilt University, Nashville, Tennessee 37235, USA.
  • Brooks ML; University of California-Riverside, Riverside, California 92521, USA.
  • Bryslawskyj J; Vanderbilt University, Nashville, Tennessee 37235, USA.
  • Buesching H; New Mexico State University, Las Cruces, New Mexico 88003, USA.
  • Bumazhnov V; Saint Petersburg State Polytechnic University, St. Petersburg 195251 Russia.
  • Campbell S; RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
  • Canoa Roman V; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Chen CH; Baruch College, City University of New York, New York, New York 10010, USA.
  • Chiu M; University of California-Riverside, Riverside, California 92521, USA.
  • Chi CY; Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
  • Choi IJ; IHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino 142281, Russia.
  • Choi JB; Columbia University, New York, New York 10027 and Nevis Laboratories, Irvington, New York 10533, USA.
  • Chujo T; Iowa State University, Ames, Iowa 50011, USA.
  • Citron Z; Department of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3800, USA.
  • Connors M; RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
  • Corliss R; Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
  • Corrales Morales Y; Columbia University, New York, New York 10027 and Nevis Laboratories, Irvington, New York 10533, USA.
  • Csanád M; University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
  • Csörgo T; Jeonbuk National University, Jeonju, 54896, Korea.
Phys Rev Lett ; 130(25): 251901, 2023 Jun 23.
Article in En | MEDLINE | ID: mdl-37418716
ABSTRACT
We present measurements of the cross section and double-helicity asymmetry A_{LL} of direct-photon production in p[over →]+p[over →] collisions at sqrt[s]=510 GeV. The measurements have been performed at midrapidity (|η|<0.25) with the PHENIX detector at the Relativistic Heavy Ion Collider. At relativistic energies, direct photons are dominantly produced from the initial quark-gluon hard scattering and do not interact via the strong force at leading order. Therefore, at sqrt[s]=510 GeV, where leading-order-effects dominate, these measurements provide clean and direct access to the gluon helicity in the polarized proton in the gluon-momentum-fraction range 0.02sensitivity to the sign of the gluon contribution.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Photons / Food Language: En Journal: Phys Rev Lett Year: 2023 Document type: Article Affiliation country: Hungary
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Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Photons / Food Language: En Journal: Phys Rev Lett Year: 2023 Document type: Article Affiliation country: Hungary