Nonprompt direct-photon production in Au plus Au collisions at √sNN=200 GeV

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

doi:10.1103/physrevc.109.044912

Nonprompt direct-photon production in Au plus Au collisions at √sNN=200 GeV

Abdulameer N. J., Acharya U., Adare A., Aidala C., Ajitanand N. N., Akiba Y., ...Daha Fazla

PHYSICAL REVIEW C, cilt.109, sa.4, 2024 (SCI-Expanded, Scopus)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 109 Sayı: 4
Basım Tarihi: 2024
Doi Numarası: 10.1103/physrevc.109.044912
Dergi Adı: PHYSICAL REVIEW C
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Yıldız Teknik Üniversitesi Adresli: Hayır

Özet

The measurement of the direct-photon spectrum from Au+Au collisions at root 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 Ncoll-scaled direct photons from p + p collisions at 200 GeV, from the direct-photon spectrum. Results are obtained for 0.8 < p(T) < 6.0 GeV/c and suggest that the spectrum has an increasing inverse slope from approximate to 0.2 to 0.4 GeV/c with increasing p(T), which indicates a possible sensitivity of the measurement to photons from earlier stages of the evolution of the collision. In addition, like the direct-photon production, the p(T) -integrated nonprompt direct-photon yields also follow a power-law scaling behavior as a function of collision-system size. The exponent, a, for the nonprompt component is found to be consistent with 1.1 with no apparent p(T) dependence.

Nonprompt direct-photon production in Au plus Au collisions at √<i>s<sub>NN</sub></i>=200 GeV

Özet