Nonprompt direct-photon production in Au+Au collisions at √(s__NN)=200 GeV

U. A. Acharya,A. Adare,C. Aidala,N. N. Ajitanand,Y. Akiba,M. Alfred,N. Apadula,H. Asano,B. Azmoun,V. Babintsev,M. Bai,N. S. Bandara,B. Bannier,K. N. Barish,S. Bathe,A. Bazilevsky,M. Beaumier,S. Beckman,R. Belmont,A. Berdnikov,Y. Berdnikov,L. Bichon,B. Blankenship,D. S. Blau,J. S. Bok,V. Borisov,K. Boyle,M. L. Brooks,J. Bryslawskyj,V. Bumazhnov,S. Campbell,V. Canoa Roman,C. -H. Chen,M. Chiu,C. Y. Chi,I. J. Choi,J. B. Choi,T. Chujo,Z. Citron,M. Connors,R. Corliss,Y. Corrales Morales,M. Csanád,T. Csörgő,T. W. Danley,A. Datta,M. S. Daugherity,G. David,C. T. Dean,K. DeBlasio,K. Dehmelt,A. Denisov,A. Deshpande,E. J. Desmond,A. Dion,P. B. Diss,J. H. Do,V. Doomra,A. Drees,K. A. Drees,J. M. Durham,A. Durum,A. Enokizono,R. Esha,B. Fadem,W. Fan,N. Feege,D. E. Fields,M. Jr. Finger,M. Finger,D. Fitzgerald,S. L. Fokin,J. E. Frantz,A. Franz,A. D. Frawley,P. Gallus,C. Gal,P. Garg,H. Ge,M. Giles,F. Giordano,A. Glenn,Y. Goto,N. Grau,S. V. Greene,M. Grosse Perdekamp,T. Gunji, T. Guo,T. Hachiya,J. S. Haggerty,K. I. Hahn,H. Hamagaki,H. F. Hamilton,J. Hanks,S. Y. Han,M. Harvey,S. Hasegawa,T. O. S. Haseler,K. Hashimoto,T. K. Hemmick,X. He,J. C. Hill,A. Hodges,R. S. Hollis,K. Homma,B. Hong,T. Hoshino,N. Hotvedt,J. Huang,K. Imai,M. Inaba,A. Iordanova,D. Isenhower,D. Ivanishchev,B. V. Jacak,M. Jezghani,X. Jiang,Z. Ji,B. M. Johnson,D. Jouan,D. S. Jumper,S. Kanda,J. H. Kang,D. Kawall,A. V. Kazantsev,J. A. Key,V. Khachatryan,A. Khanzadeev,A. Khatiwada,B. Kimelman,C. Kim, D. J. Kim,E. -J. Kim,G. W. Kim,M. Kim,T. Kim,D. Kincses,A. Kingan,E. Kistenev,R. Kitamura,J. Klatsky,D. Kleinjan,P. Kline,T. Koblesky,B. Komkov,D. Kotov,L. Kovacs,K. Kurita,M. Kurosawa,Y. Kwon,J. G. Lajoie,D. Larionova,A. Lebedev,S. Lee,S. H. Lee,M. J. Leitch,N. A. Lewis,S. H. Lim,M. X. Liu,X. Li,X. Li,D. A. Loomis,D. Lynch,S. Lökös,T. Majoros,Y. I. Makdisi,M. Makek,A. Manion,V. I. Manko,E. Mannel,M. McCumber,P. L. McGaughey,D. McGlinchey,C. McKinney,A. Meles,M. Mendoza,A. C. Mignerey,A. Milov,D. K. Mishra,J. T. Mitchell,M. Mitrankova,Iu. Mitrankov,S. Miyasaka,S. Mizuno,A. K. Mohanty,M. M. Mondal,P. Montuenga,T. Moon,D. P. Morrison,T. V. Moukhanova,B. Mulilo,T. Murakami,J. Murata,A. Mwai,K. Nagashima,J. L. Nagle,M. I. Nagy,I. Nakagawa,H. Nakagomi,K. Nakano,C. Nattrass,S. Nelson,P. K. Netrakanti,T. Niida,S. Nishimura,R. Nouicer,N. Novitzky,T. Novák,G. Nukazuka,A. S. Nyanin,E. O'Brien,C. A. Ogilvie,J. D. Orjuela Koop,J. D. Osborn,A. Oskarsson,K. Ozawa,R. Pak,V. Pantuev,V. Papavassiliou,J. S. Park,S. Park,M. Patel,S. F. Pate,J. -C. Peng,W. Peng,D. V. Perepelitsa,G. D. N. Perera,D. Yu. Peressounko,C. E. PerezLara,J. Perry,R. Petti,C. Pinkenburg,R. Pinson,R. P. Pisani,M. Potekhin,A. Pun,M. L. Purschke,P. V. Radzevich,J. Rak,N. Ramasubramanian,B. J. Ramson,I. Ravinovich,K. F. Read,D. Reynolds,V. Riabov,Y. Riabov,D. Richford,T. Rinn,S. D. Rolnick,M. Rosati,Z. Rowan,J. G. Rubin,J. Runchey,B. Sahlmueller,N. Saito,T. Sakaguchi,H. Sako,V. Samsonov,M. Sarsour,S. Sato,B. Schaefer,B. K. Schmoll,K. Sedgwick,R. Seidl,A. Sen,R. Seto,P. Sett,A. Sexton,D. Sharma,I. Shein,T. -A. Shibata,K. Shigaki,M. Shimomura,P. Shukla,A. Sickles,C. L. Silva,D. Silvermyr,B. K. Singh,C. P. Singh,V. Singh,M. Slunečka,K. L. Smith,M. Snowball,R. A. Soltz,W. E. Sondheim,S. P. Sorensen,I. V. Sourikova,P. W. Stankus,M. Stepanov,S. P. Stoll,T. Sugitate,A. Sukhanov,T. Sumita,J. Sun,Z. Sun,J. Sziklai,A. Taketani,K. Tanida,M. J. Tannenbaum,S. Tarafdar,A. Taranenko,R. Tieulent,A. Timilsina,T. Todoroki,M. Tomášek,C. L. Towell,R. Towell,R. S. Towell,I. Tserruya,Y. Ueda,B. Ujvari,H. W. van Hecke,J. Velkovska,M. Virius,V. Vrba,X. R. Wang,Y. Watanabe,Y. S. Watanabe,F. Wei,A. S. White,C. P. Wong,C. L. Woody,M. Wysocki,B. Xia,L. Xue,S. Yalcin,Y. L. Yamaguchi,A. Yanovich,I. Yoon,J. H. Yoo,I. E. Yushmanov,H. Yu,W. A. Zajc,A. Zelenski,S. Zhou,L. Zou

arxiv（2022）

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摘要

The measurement of the direct-photon spectrum from Au+Au collisions at √(s__NN)=200 GeV is presented by the PHENIX collaboration using the external-photon-conversion technique for 0%–93% central collisions in a transverse-momentum (p_T) range of 0.8–10 GeV/c. An excess of direct photons, above prompt-photon production from hard-scattering processes, is observed for p_T<6 GeV/c. Nonprompt direct photons are measured by subtracting the prompt component, which is estimated as N_ coll-scaled direct photons from p+p collisions at 200 GeV, from the direct-photon spectrum. Results are obtained for 0.8更多

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