Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at sqrt[s]=510 GeV in p[over →]+p[over →] Collisions

N J Abdulameer¹, U Acharya², A Adare³, C Aidala⁴, N N Ajitanand⁵, Y Akiba^{6

7}, R Akimoto⁸, M Alfred⁹, N Apadula^{10

11}, Y Aramaki⁶, H Asano^{12

6}, E T Atomssa¹¹, T C Awes¹³, B Azmoun¹⁴, V Babintsev¹⁵, M Bai¹⁶, N S Bandara¹⁷, B Bannier¹¹, K N Barish¹⁸, S Bathe^{19

7}, A Bazilevsky¹⁴, M Beaumier¹⁸, S Beckman³, R Belmont^{3

20}, A Berdnikov²¹, Y Berdnikov²¹, L Bichon²², D Black¹⁸, B Blankenship²², J S Bok²³, V Borisov²¹, K Boyle⁷, M L Brooks²⁴, J Bryslawskyj^{19

18}, H Buesching¹⁴, V Bumazhnov¹⁵, S Campbell^{25

10}, V Canoa Roman¹¹, C-H Chen⁷, M Chiu¹⁴, C Y Chi²⁵, I J Choi²⁶, J B Choi²⁷, T Chujo²⁸, Z Citron²⁹, M Connors², R Corliss¹¹, Y Corrales Morales²⁴, M Csanád³⁰, T Csörgő^{31

32}, A Datta³³, M S Daugherity³⁴, G David^{14

11}, C T Dean²⁴, K DeBlasio³³, K Dehmelt¹¹, A Denisov¹⁵, A Deshpande^{7

11}, E J Desmond¹⁴, L Ding¹⁰, A Dion¹¹, V Doomra¹¹, J H Do³⁵, A Drees¹¹, K A Drees¹⁶, J M Durham²⁴, A Durum¹⁵, H En'yo⁶, A Enokizono^{6

36}, R Esha¹¹, B Fadem³⁷, W Fan¹¹, N Feege¹¹, D E Fields³³, M Finger³⁸, M Finger³⁸, D Firak^{1

11}, D Fitzgerald⁴, S L Fokin³⁹, J E Frantz⁴⁰, A Franz¹⁴, A D Frawley⁴¹, P Gallus⁴², C Gal¹¹, P Garg^{43

11}, H Ge¹¹, M Giles¹¹, F Giordano²⁶, A Glenn⁴⁴, Y Goto^{6

7}, N Grau⁴⁵, S V Greene²², M Grosse Perdekamp²⁶, T Gunji⁸, H Guragain², Y Gu⁵, T Hachiya^{46

6

7}, J S Haggerty¹⁴, K I Hahn⁴⁷, H Hamagaki⁸, J Hanks¹¹, S Y Han^{47

48}, M Harvey⁴⁹, S Hasegawa⁵⁰, T K Hemmick¹¹, X He², J C Hill¹⁰, A Hodges^{2

26}, R S Hollis¹⁸, K Homma⁵¹, B Hong⁴⁸, T Hoshino⁵¹, J Huang^{14

24}, Y Ikeda⁶, K Imai⁵⁰, Y Imazu⁶, M Inaba²⁸, A Iordanova¹⁸, D Isenhower³⁴, D Ivanishchev⁵², B V Jacak¹¹, S J Jeon⁵³, M Jezghani², X Jiang²⁴, Z Ji¹¹, B M Johnson^{14

2}, E Joo⁴⁸, K S Joo⁵³, D Jouan⁵⁴, D S Jumper²⁶, J H Kang³⁵, J S Kang⁵⁵, D Kawall¹⁷, A V Kazantsev³⁹, J A Key³³, V Khachatryan¹¹, A Khanzadeev⁵², A Khatiwada²⁴, K Kihara²⁸, C Kim⁴⁸, D H Kim⁴⁷, D J Kim⁵⁶, E-J Kim²⁷, H-J Kim³⁵, M Kim⁵⁷, T Kim⁴⁷, Y K Kim⁵⁵, D Kincses³⁰, A Kingan¹¹, E Kistenev¹⁴, J Klatsky⁴¹, D Kleinjan¹⁸, P Kline¹¹, T Koblesky³, M Kofarago^{30

32}, J Koster⁷, D Kotov^{52

21}, L Kovacs³⁰, B Kurgyis³⁰, K Kurita³⁶, M Kurosawa^{6

7}, Y Kwon³⁵, J G Lajoie¹⁰, D Larionova²¹, A Lebedev¹⁰, K B Lee²⁴, S H Lee^{10

4

11}, M J Leitch²⁴, M Leitgab²⁶, N A Lewis⁴, S H Lim^{58

35}, M X Liu²⁴, X Li²⁴, D A Loomis⁴, D Lynch¹⁴, S Lökös³⁰, T Majoros¹, Y I Makdisi¹⁶, M Makek^{29

59}, A Manion¹¹, V I Manko³⁹, E Mannel¹⁴, M McCumber²⁴, P L McGaughey²⁴, D McGlinchey^{3

24}, C McKinney²⁶, A Meles²³, M Mendoza¹⁸, B Meredith²⁵, Y Miake²⁸, A C Mignerey⁶⁰, A J Miller³⁴, A Milov²⁹, D K Mishra⁶¹, J T Mitchell¹⁴, M Mitrankova²¹, Iu Mitrankov²¹, S Miyasaka^{6

62}, S Mizuno^{6

28}, M M Mondal¹¹, P Montuenga²⁶, T Moon^{48

35}, D P Morrison¹⁴, T V Moukhanova³⁹, A Muhammad⁶³, B Mulilo^{48

6

64}, T Murakami^{12

6}, J Murata^{6

36}, A Mwai⁵, S Nagamiya^{65

6}, J L Nagle³, M I Nagy³⁰, I Nakagawa^{6

7}, H Nakagomi^{6

28}, K Nakano^{6

62}, C Nattrass⁶⁶, S Nelson⁶⁷, P K Netrakanti⁶¹, M Nihashi^{51

6}, T Niida²⁸, R Nouicer^{14

7}, N Novitzky^{56

11

28}, G Nukazuka^{6

7}, A S Nyanin³⁹, E O'Brien¹⁴, C A Ogilvie¹⁰, J Oh⁵⁸, J D Orjuela Koop³, M Orosz¹, J D Osborn^{4

13}, A Oskarsson⁶⁸, K Ozawa^{65

28}, R Pak¹⁴, V Pantuev⁶⁹, V Papavassiliou²³, J S Park⁵⁷, S Park^{63

57

11}, L Patel², M Patel¹⁰, S F Pate²³, J-C Peng²⁶, W Peng²², D V Perepelitsa^{14

3

25}, G D N Perera²³, D Yu Peressounko³⁹, C E PerezLara¹¹, J Perry¹⁰, R Petti^{14

11}, C Pinkenburg¹⁴, R Pinson³⁴, R P Pisani¹⁴, M Potekhin¹⁴, A Pun⁴⁰, M L Purschke¹⁴, P V Radzevich²¹, J Rak⁵⁶, N Ramasubramanian¹¹, I Ravinovich²⁹, K F Read^{13

66}, D Reynolds⁵, V Riabov^{70

52}, Y Riabov^{52

21}, D Richford¹⁹, N Riveli⁴⁰, D Roach²², S D Rolnick¹⁸, M Rosati¹⁰, Z Rowan¹⁹, J G Rubin⁴, J Runchey¹⁰, N Saito⁶⁵, T Sakaguchi¹⁴, H Sako⁵⁰, V Samsonov^{70

52}, M Sarsour², S Sato⁵⁰, S Sawada⁶⁵, B Schaefer²², B K Schmoll⁶⁶, K Sedgwick¹⁸, J Seele⁷, R Seidl^{6

7}, A Sen^{10

66}, R Seto¹⁸, P Sett⁶¹, A Sexton⁶⁰, D Sharma¹¹, I Shein¹⁵, M Shibata⁴⁶, T-A Shibata^{6

62}, K Shigaki⁵¹, M Shimomura^{10

46}, Z Shi²⁴, P Shukla⁶¹, A Sickles^{14

26}, C L Silva²⁴, D Silvermyr^{68

13}, B K Singh⁴³, C P Singh⁴³, V Singh⁴³, M Slunečka³⁸, K L Smith⁴¹, R A Soltz⁴⁴, W E Sondheim²⁴, S P Sorensen⁶⁶, I V Sourikova¹⁴, P W Stankus¹³, M Stepanov¹⁷, S P Stoll¹⁴, T Sugitate⁵¹, A Sukhanov¹⁴, T Sumita⁶, J Sun¹¹, Z Sun¹, J Sziklai³², R Takahama⁴⁶, A Takahara⁸, A Taketani^{6

7}, K Tanida^{50

7

57}, M J Tannenbaum¹⁴, S Tarafdar^{22

29}, A Taranenko^{70

5}, A Timilsina¹⁰, T Todoroki^{6

7

28}, M Tomášek⁴², H Torii⁸, M Towell³⁴, R Towell³⁴, R S Towell³⁴, I Tserruya²⁹, Y Ueda⁵¹, B Ujvari¹, H W van Hecke²⁴, M Vargyas^{30

32}, J Velkovska²², M Virius⁴², V Vrba^{42

71}, E Vznuzdaev⁵², X R Wang^{23

7}, Z Wang¹⁹, D Watanabe⁵¹, Y Watanabe^{6

7}, Y S Watanabe^{8

65}, F Wei²³, S Whitaker¹⁰, S Wolin²⁶, C P Wong^{2

24}, C L Woody¹⁴, M Wysocki¹³, B Xia⁴⁰, L Xue², S Yalcin¹¹, Y L Yamaguchi^{8

11}, A Yanovich¹⁵, I Yoon⁵⁷, I Younus⁷², I E Yushmanov³⁹, W A Zajc²⁵, A Zelenski¹⁶, L Zou¹⁸; PHENIX Collaboration

Affiliations

¹ Debrecen University, H-4010 Debrecen, Egyetem tér 1, Hungary.
² Georgia State University, Atlanta, Georgia 30303, USA.
³ University of Colorado, Boulder, Colorado 80309, USA.
⁴ Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA.
⁵ Chemistry Department, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USA.
⁶ RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan.
⁷ RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
⁸ Center for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
⁹ Department of Physics and Astronomy, Howard University, Washington, D.C. 20059, USA.
¹⁰ Iowa State University, Ames, Iowa 50011, USA.
¹¹ Department of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3800, USA.
¹² Kyoto University, Kyoto 606-8502, Japan.
¹³ Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
¹⁴ Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
¹⁵ IHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino 142281, Russia.
¹⁶ Collider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
¹⁷ Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003-9337, USA.
¹⁸ University of California-Riverside, Riverside, California 92521, USA.
¹⁹ Baruch College, City University of New York, New York, New York 10010, USA.
²⁰ Physics and Astronomy Department, University of North Carolina at Greensboro, Greensboro, North Carolina 27412, USA.
²¹ Saint Petersburg State Polytechnic University, St. Petersburg 195251 Russia.
²² Vanderbilt University, Nashville, Tennessee 37235, USA.
²³ New Mexico State University, Las Cruces, New Mexico 88003, USA.
²⁴ Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
²⁵ Columbia University, New York, New York 10027 and Nevis Laboratories, Irvington, New York 10533, USA.
²⁶ University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
²⁷ Jeonbuk National University, Jeonju, 54896, Korea.
²⁸ Tomonaga Center for the History of the Universe, University of Tsukuba, Tsukuba, Ibaraki 305, Japan.
²⁹ Weizmann Institute, Rehovot 76100, Israel.
³⁰ ELTE, Eötvös Loránd University, H-1117 Budapest, Pázmány P. s. 1/A, Hungary.
³¹ MATE, Laboratory of Femtoscopy, Károly Róbert Campus, H-3200 Gyöngyös, Mátraiút 36, Hungary.
³² Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Hungarian Academy of Sciences (Wigner RCP, RMKI) H-1525 Budapest 114, P.O. Box 49, Budapest, Hungary.
³³ University of New Mexico, Albuquerque, New Mexico 87131, USA.
³⁴ Abilene Christian University, Abilene, Texas 79699, USA.
³⁵ Yonsei University, IPAP, Seoul 120-749, Korea.
³⁶ Physics Department, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan.
³⁷ Muhlenberg College, Allentown, Pennsylvania 18104-5586, USA.
³⁸ Charles University, Faculty of Mathematics and Physics, 180 00 Troja, Prague, Czech Republic.
³⁹ National Research Center "Kurchatov Institute," Moscow 123098, Russia.
⁴⁰ Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA.
⁴¹ Florida State University, Tallahassee, Florida 32306, USA.
⁴² Czech Technical University, Zikova 4, 166 36 Prague 6, Czech Republic.
⁴³ Department of Physics, Banaras Hindu University, Varanasi 221005, India.
⁴⁴ Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
⁴⁵ Department of Physics, Augustana University, Sioux Falls, South Dakota 57197, USA.
⁴⁶ Nara Women's University, Kita-uoya Nishi-machi Nara 630-8506, Japan.
⁴⁷ Ewha Womans University, Seoul 120-750, Korea.
⁴⁸ Korea University, Seoul 02841, Korea.
⁴⁹ Texas Southern University, Houston, Texas 77004, USA.
⁵⁰ Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata Shirane, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan.
⁵¹ Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan.
⁵² PNPI, Petersburg Nuclear Physics Institute, Gatchina, Leningrad region 188300, Russia.
⁵³ Myongji University, Yongin, Kyonggido 449-728, Korea.
⁵⁴ IPN-Orsay, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, BP1, F-91406 Orsay, France.
⁵⁵ Hanyang University, Seoul 133-792, Korea.
⁵⁶ Helsinki Institute of Physics and University of Jyväskylä, P.O.Box 35, FI-40014 Jyväskylä, Finland.
⁵⁷ Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea.
⁵⁸ Pusan National University, Pusan 46241, Korea.
⁵⁹ Department of Physics, Faculty of Science, University of Zagreb, Bijenička c. 32 HR-10002 Zagreb, Croatia.
⁶⁰ University of Maryland, College Park, Maryland 20742, USA.
⁶¹ Bhabha Atomic Research Centre, Bombay 400 085, India.
⁶² Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro, Tokyo 152-8551, Japan.
⁶³ Mississippi State University, Mississippi State, Mississippi 39762, USA.
⁶⁴ Department of Physics, School of Natural Sciences, University of Zambia, Great East Road Campus, Box 32379 Lusaka, Zambia.
⁶⁵ KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan.
⁶⁶ University of Tennessee, Knoxville, Tennessee 37996, USA.
⁶⁷ Florida A&M University, Tallahassee, Florida 32307, USA.
⁶⁸ Department of Physics, Lund University, Box 118, SE-221 00 Lund, Sweden.
⁶⁹ Institute for Nuclear Research of the Russian Academy of Sciences, prospekt 60-letiya Oktyabrya 7a, Moscow 117312, Russia.
⁷⁰ National Research Nuclear University, MEPhI, Moscow Engineering Physics Institute, Moscow 115409, Russia.
⁷¹ Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic.
⁷² Physics Department, Lahore University of Management Sciences, Lahore 54792, Pakistan.

PMID: 37418716
DOI: 10.1103/PhysRevLett.130.251901

Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at sqrt[s]=510 GeV in p[over →]+p[over →] Collisions

N J Abdulameer et al. Phys Rev Lett. 2023.

. 2023 Jun 23;130(25):251901.

doi: 10.1103/PhysRevLett.130.251901.

Authors

Affiliations

¹ Debrecen University, H-4010 Debrecen, Egyetem tér 1, Hungary.
² Georgia State University, Atlanta, Georgia 30303, USA.
³ University of Colorado, Boulder, Colorado 80309, USA.
⁴ Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA.
⁵ Chemistry Department, Stony Brook University, SUNY, Stony Brook, New York 11794-3400, USA.
⁶ RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan.
⁷ RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
⁸ Center for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
⁹ Department of Physics and Astronomy, Howard University, Washington, D.C. 20059, USA.
¹⁰ Iowa State University, Ames, Iowa 50011, USA.
¹¹ Department of Physics and Astronomy, Stony Brook University, SUNY, Stony Brook, New York 11794-3800, USA.
¹² Kyoto University, Kyoto 606-8502, Japan.
¹³ Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
¹⁴ Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
¹⁵ IHEP Protvino, State Research Center of Russian Federation, Institute for High Energy Physics, Protvino 142281, Russia.
¹⁶ Collider-Accelerator Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.
¹⁷ Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003-9337, USA.
¹⁸ University of California-Riverside, Riverside, California 92521, USA.
¹⁹ Baruch College, City University of New York, New York, New York 10010, USA.
²⁰ Physics and Astronomy Department, University of North Carolina at Greensboro, Greensboro, North Carolina 27412, USA.
²¹ Saint Petersburg State Polytechnic University, St. Petersburg 195251 Russia.
²² Vanderbilt University, Nashville, Tennessee 37235, USA.
²³ New Mexico State University, Las Cruces, New Mexico 88003, USA.
²⁴ Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
²⁵ Columbia University, New York, New York 10027 and Nevis Laboratories, Irvington, New York 10533, USA.
²⁶ University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
²⁷ Jeonbuk National University, Jeonju, 54896, Korea.
²⁸ Tomonaga Center for the History of the Universe, University of Tsukuba, Tsukuba, Ibaraki 305, Japan.
²⁹ Weizmann Institute, Rehovot 76100, Israel.
³⁰ ELTE, Eötvös Loránd University, H-1117 Budapest, Pázmány P. s. 1/A, Hungary.
³¹ MATE, Laboratory of Femtoscopy, Károly Róbert Campus, H-3200 Gyöngyös, Mátraiút 36, Hungary.
³² Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Hungarian Academy of Sciences (Wigner RCP, RMKI) H-1525 Budapest 114, P.O. Box 49, Budapest, Hungary.
³³ University of New Mexico, Albuquerque, New Mexico 87131, USA.
³⁴ Abilene Christian University, Abilene, Texas 79699, USA.
³⁵ Yonsei University, IPAP, Seoul 120-749, Korea.
³⁶ Physics Department, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan.
³⁷ Muhlenberg College, Allentown, Pennsylvania 18104-5586, USA.
³⁸ Charles University, Faculty of Mathematics and Physics, 180 00 Troja, Prague, Czech Republic.
³⁹ National Research Center "Kurchatov Institute," Moscow 123098, Russia.
⁴⁰ Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA.
⁴¹ Florida State University, Tallahassee, Florida 32306, USA.
⁴² Czech Technical University, Zikova 4, 166 36 Prague 6, Czech Republic.
⁴³ Department of Physics, Banaras Hindu University, Varanasi 221005, India.
⁴⁴ Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
⁴⁵ Department of Physics, Augustana University, Sioux Falls, South Dakota 57197, USA.
⁴⁶ Nara Women's University, Kita-uoya Nishi-machi Nara 630-8506, Japan.
⁴⁷ Ewha Womans University, Seoul 120-750, Korea.
⁴⁸ Korea University, Seoul 02841, Korea.
⁴⁹ Texas Southern University, Houston, Texas 77004, USA.
⁵⁰ Advanced Science Research Center, Japan Atomic Energy Agency, 2-4 Shirakata Shirane, Tokai-mura, Naka-gun, Ibaraki-ken 319-1195, Japan.
⁵¹ Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan.
⁵² PNPI, Petersburg Nuclear Physics Institute, Gatchina, Leningrad region 188300, Russia.
⁵³ Myongji University, Yongin, Kyonggido 449-728, Korea.
⁵⁴ IPN-Orsay, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, BP1, F-91406 Orsay, France.
⁵⁵ Hanyang University, Seoul 133-792, Korea.
⁵⁶ Helsinki Institute of Physics and University of Jyväskylä, P.O.Box 35, FI-40014 Jyväskylä, Finland.
⁵⁷ Department of Physics and Astronomy, Seoul National University, Seoul 151-742, Korea.
⁵⁸ Pusan National University, Pusan 46241, Korea.
⁵⁹ Department of Physics, Faculty of Science, University of Zagreb, Bijenička c. 32 HR-10002 Zagreb, Croatia.
⁶⁰ University of Maryland, College Park, Maryland 20742, USA.
⁶¹ Bhabha Atomic Research Centre, Bombay 400 085, India.
⁶² Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro, Tokyo 152-8551, Japan.
⁶³ Mississippi State University, Mississippi State, Mississippi 39762, USA.
⁶⁴ Department of Physics, School of Natural Sciences, University of Zambia, Great East Road Campus, Box 32379 Lusaka, Zambia.
⁶⁵ KEK, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan.
⁶⁶ University of Tennessee, Knoxville, Tennessee 37996, USA.
⁶⁷ Florida A&M University, Tallahassee, Florida 32307, USA.
⁶⁸ Department of Physics, Lund University, Box 118, SE-221 00 Lund, Sweden.
⁶⁹ Institute for Nuclear Research of the Russian Academy of Sciences, prospekt 60-letiya Oktyabrya 7a, Moscow 117312, Russia.
⁷⁰ National Research Nuclear University, MEPhI, Moscow Engineering Physics Institute, Moscow 115409, Russia.
⁷¹ Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic.
⁷² Physics Department, Lahore University of Management Sciences, Lahore 54792, Pakistan.

PMID: 37418716
DOI: 10.1103/PhysRevLett.130.251901

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 0.02<x<0.08, with direct sensitivity to the sign of the gluon contribution.

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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

Affiliations

Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at sqrt[s]=510 GeV in p[over →]+p[over →] Collisions

Authors

Affiliations

Abstract

MeSH terms

LinkOut - more resources

Full Text Sources