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

N J Abdulameer ,D Roach,S P Sørensen ,S Hasegawa,S Bathe,D Richford,L Xue,D Jouan,N Grau,D Larionova,N Novitzky,N Saito,E Joo,D Kotov,T Moon,H Ge,M J Tannenbaum ,K A Drees ,G Nukazuka,R Seidl,Y Berdnikov,A Enokizono,S D Rolnick ,I Younus,M J Leitch ,M Sarsour,C A Aidala ,T K Hemmick ,X R Wang ,R Esha,F Wei,M Kurosawa,Y Aramaki,Y Riabov,V Khachatryan,K Imai,W A Zajc ,D S Jumper ,K Ozawa,T V Moukhanova ,M Alfred,K Boyle,V Riabov,J Choi ,A Glenn,A Nyanin ,E Vznuzdaev,L Zou,M Beaumier,V Bumazhnov,B Azmoun,E Mannel,J Perry,A Sen,J S Park ,S Mizuno,A D Frawley ,L Patel,Z Wang,C A Ogilvie ,A Sukhanov,M Mitrankova,S Campbell,Y Kwon,J Velkovska,N Feege,M Nihashi,M Patel,C E Perezlara ,K Deblasio,Jeongsu Bok ,A Sexton,V Vrba,P K Netrakanti ,Z Ji,Y T Gu ,S Nelson,B Mulilo,S Lökòs ,J L Nagle ,S Wolin,P Kline,P V Radzevich ,A Iordanova,E.-J Kim,C Mckinney,M Slunečka,J Bryslawskyj,C Nattrass,C Kim,B M Johnson ,A Meles,D Reynolds,J Huang,J Oh,R Pak,F Giordano,J Klatsky,Z Rowan,L Ding,H Nakagomi,Y Ueda,P Garg,D J Kim ,Y Corrales Morales,A V Kazantsev ,T Kim,C Y ,S H Lee ,V Doomra,J S Haggerty ,A C Mignerey ,J M Durham ,B Bannier,K N Barish ,J Sziklai,T Gunji,D Fitzgerald,M Daugherity ,N A Lewis ,T A Shibata ,K Shigaki,Y Akiba,B Schaefer,I Nakagawa,Iu Mitrankov,I V Sourikova ,R S Hollis ,M L Brooks ,S Beckman,W Fan,I E Yushmanov ,V K Singh ,A Khanzadeev,V Pantuev,A Deshpande,M Towell,M Inaba,R Pinson,C.-H Chen,D Kleinjan,X He,M Grosse Perdekamp,W E Sondheim ,K B Lee ,T Sumita,S Fokin ,Zhongzhi Shi ,H Hamagaki,E T Atomssa ,J E Frantz ,N N Ajitanand ,A Taketani,U Acharya,Y Ikeda,Sihyun Jeon ,S P Whitaker ,L Kovács ,M M Mondal ,T Chujo,Masayuki Shibata ,M Kim,R Petti,T Sakaguchi,C T Dean ,N S Bandara ,J Runchey,Kenneth Francis Read ,K Nakano,H.-J Kim,J G Lajoie ,J H Kang ,Daisuke Watanabe ,H Guragain,R Seto,B Hong,R Corliss,A M Sickles ,T Csörgõ ,Y I Makdisi ,A Denisov,P Montuenga,H Buesching,K Tanida,Deirdre Black ,D K Mishra ,J Rak,D Sharma,D P Morrison ,A Adare,D Silvermyr,P Sett,Y Imazu,E Kistenev,M L Purschke ,D Yu Peressounko ,C Pinkenburg,V.s Borisov ,K Kurita,R A Soltz ,Y Goto,S Miyasaka,D V Perepelitsa ,A Franz,M Orosz,D E Fields ,D H Kim ,M Csanád,J C Peng ,C P Singh ,Y K Kim ,K S Joo ,C P Wong ,D Kawall,M Wysocki,S F Pate ,A Mwai,A Berdnikov,A Dion,N Ramasubramanian,J Sun,T Koblesky,R Belmont,H Sako,R P Pisani ,J Hanks,H Asano,Sanghoon Lim ,V Babintsev,N Apadula,A Hodges,J T Mitchell ,B Kurgyis,S Greene ,C L Silva ,J D Osborn ,A Timilsina,I Tserruya,A Muhammad,X Jiang,Mei Bai ,M Kofarago,W Peng,E J Desmond ,R Takahama,S Park,L Bichon,A Datta,J A Key ,B Fadem,K Smith ,S P Stoll ,D Mcglinchey,H En’Yo,M Chiu,S Y Han ,K Homma,H Torii,A Kingan,D A Loomis ,I J Choi ,R Akimoto,B Xia,P W Stankus ,A Yanovich,V Manko ,T Hachiya,Z J Sun ,D Isenhower,J H ,B K Singh ,D Kincses,D Firak,A Takahara,D Lynch,J Rubin ,E O’Brien,Z H Citron ,T Sugitate,Y Watanabe,N Riveli,A Zelenski,J Murata,T Majoros,I Ravinovich,A Taranenko,V Canoa Roman,H W Van Hecke ,B Jacak ,Y Miake,C Gal,M Tomášek,M I Nagy ,B Blankenship,T Hoshino,A Pun,J S Kang ,M Mendoza,S Sawada,R Nouicer,B K Schmoll ,A Öskarsson ,A Drees,A Khatiwada,P Shukla,C L Woody ,A Manion,M Finger,V Papavassiliou,M Mccumber,A Durum,S Nagamiya,M Harvey,K Sedgwick,A Bazilevsky,T Niida,M Virius,M X Liu ,Susumu Sato ,Y Yamaguchi ,J C Hill ,M Stepanov,J Koster,K Kihara,A J Miller ,X Li,R S Towell ,K I Hahn ,M Potekhin,I Shein,M Giles,P L Mcgaughey ,A Milov,M Shimomura,M Jezghani,T C Awes ,M Makek,P Gallus,A Lebedev,B Ujvári ,D Ivanishchev,T Todoroki,V Samsonov,I Yoon,M Vargyas,J Seele,G David,J D Orjuela Koop ,S Tarafdar,M Connors,S Yalcin,K Dehmelt,M Leitgab,T Murakami,G D N Perera ,B Meredith,M Rosati

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 , D Roach + Show 355 more

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https://doi.org/10.1103/physrevlett.130.251901

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Journal: Physical Review Letters	Publication Date: Jun 21, 2023
Citations: 2	License type: CC BY 4.0

#Double-helicity Asymmetry #PHENIX Detector + Show 8 more

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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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