Disentangling Centrality Bias and Final-State Effects in the Production of High- pT Neutral Pions Using Direct Photon in d+Au Collisions at sNN =200 GeV

  • Abdulameer, N.J.; 
  • Acharya, U.; 
  • Aidala, C.; 
  • Akiba, Y.; 
  • Alfred, M.; 
  • ... Hong, B.; 
  • 외 272명
Citations

WEB OF SCIENCE

13
Citations

SCOPUS

15

초록

PHENIX presents a simultaneous measurement of the production of direct γ and π0 in d+Au collisions at sNN=200 GeV over a pT range of 7.5 to 18 GeV/c for different event samples selected by event activity, i.e., charged-particle multiplicity detected at forward rapidity. Direct-photon yields are used to empirically estimate the contribution of hard-scattering processes in the different event samples. Using this estimate, the average nuclear-modification factor, RdAu,EXPπ0, is 0.925±0.023(stat)±0.15(scale), consistent with unity for minimum-bias (MB) d+Au collisions. For event classes with low and moderate event activity, RdAu,EXPπ0 is consistent with the MB value within 5% uncertainty. This result confirms that the previously observed enhancement of high-pT π0 production found in small-system collisions with low event activity is a result of a bias in interpreting event activity within the Glauber framework. In contrast, for the top 5% of events with the highest event activity, RdAu,EXPπ0 is suppressed by 20% relative to the MB value with a significance of 4.5σ, which may be due to final-state effects. This suppression corresponds to a pT shift of δpT=0.213±0.055 Gev/c at 9 Gev/c. © 2025 American Physical Society.

키워드

Atomic Beams; Colliding Beam Accelerators; Germanium Compounds; Hadrons; Linear Accelerators; Negative Ions; Positive Ions; Proportional Counters; Charged Particle Multiplicities; Direct Photons; Final-state Effects; Forward Rapidity; Measurements Of; Neutral Pions; Nuclear Modification Factors; Photon Yield; Scattering Process; Simultaneous Measurement; Photons; Article; Human; Photon; Pion; PB-PB COLLISIONS; CHARGED-PARTICLE PRODUCTION; LARGE TRANSVERSE-MOMENTUM; DEPENDENCE; RAPIDITY; SPECTRA
제목
Disentangling Centrality Bias and Final-State Effects in the Production of High- pT Neutral Pions Using Direct Photon in d+Au Collisions at sNN =200 GeV
저자
Abdulameer, N.J.; Acharya, U.; Aidala, C.; Akiba, Y.; Alfred, M.; Aoki, K.; Apadula, N.; Ayuso, C.; Babintsev, V.; Barish, K.N.; Bathe, S.; Bazilevsky, A.; Belmont, R.; Berdnikov, A.; Berdnikov, Y.; Bichon, L.; Blankenship, B.; Blau, D.S.; Boer, M.; Bok, J.S.; Borisov, V.; Brooks, M.L.; Bryslawskyj, J.; Bumazhnov, V.; Butler, C.; Campbell, S.; Canoa Roman, V.; Chiu, M.; Connors, M.; Corliss, R.; Corrales Morales, Y.; Csanád, M.; Csörgo, T.; Liu, L.D.; Danley, T.W.; Daugherity, M.S.; David, G.; Dean, C.T.; Deblasio, K.; Dehmelt, K.; Denisov, A.; Deshpande, A.; Desmond, E.J.; Doomra, V.; Do, J.H.; Drees, A.; Drees, K.A.; Dumancic, M.; Durham, J.M.; Durum, A.; Elder, T.; Enokizono, A.; Esha, R.; Fadem, B.; Fan, W.; Feege, N.; Finger, M.; Finger, M.; Firak, D.; Fitzgerald, D.; Fokin, S.L.; Frantz, J.E.; Franz, A.; Frawley, A.D.; Fukuda, Y.; Gal, C.; Garg, P.; Ge, H.; Giles, M.; Goto, Y.; Grau, N.; Greene, S.V.; Gunji, T.; Hachiya, T.; Haggerty, J.S.; Hahn, K.I.; Han, S.Y.; Harvey, M.; Hasegawa, S.; Haseler, T.O.S.; Hemmick, T.K.; He, X.; Hill, K.; Hodges, A.; Homma, K.; Hong, B.; Hoshino, T.; Hotvedt, N.; Huang, J.; Imrek, J.; Inaba, M.; Isenhower, D.; Ito, Y.; Ivanishchev, D.; Jacak, B.V.; Ji, Z.; Johnson, B.M.; Jorjadze, V.; Jouan, D.; Jumper, D.S.; Kang, J.H.; Kapukchyan, D.; Karthas, S.; Kazantsev, A.V.; Khachatryan, V.; Khanzadeev, A.; Khatiwada, A.; Kim, C.; Kim, D.J.; Kim, E.-J.; Kim, M.; Kim, M.H.; Kim, T.; Kincses, D.; Kingan, A.; Kistenev, E.; Koblesky, T.; Kotov, D.; Kovacs, L.; Kudo, S.; Kurgyis, B.; Kurita, K.; Lajoie, J.G.; Lallow, E.O.; Larionova, D.; Lebedev, A.; Lee, S.H.; Leitch, M.J.; Leung, Y.H.; Lewis, N.A.; Lim, S.H.; Liu, M.X.; Li, X.; Loggins, V.-R.; Loomis, D.A.; Lynch, D.; Lökös, S.; Majoros, T.; Makek, M.; Malaev, M.; Manko, V.I.; Mannel, E.; Masuda, H.; McCumber, M.; McGlinchey, D.; Mignerey, A.C.; Mihalik, D.E.; Milov, A.; Mishra, D.K.; Mitchell, J.T.; Mitrankova, M.; Mitrankov, Iu.; Mitsuka, G.; Mondal, M.M.; Moon, T.; Morrison, D.P.; Morrow, S.I.; Muhammad, A.; Mulilo, B.; Murakami, T.; Murata, J.; Nagai, K.; Nagashima, K.; Nagashima, T.; Nagle, J.L.; Nagy, M.I.; Nakagawa, I.; Nakagomi, H.; Nakano, K.; Nattrass, C.; Nelson, S.; Nouicer, R.; Novitzky, N.; Novotny, R.; Novák, T.; Nukazuka, G.; Nyanin, A.S.; O'Brien, E.; Ogilvie, C.A.; Oh, J.; Orjuela Koop, J.D.; Orosz, M.; Osborn, J.D.; Oskarsson, A.; Ozawa, K.; Pantuev, V.; Papavassiliou, V.; Park, J.S.; Park, S.; Patel, M.; Pate, S.F.; Peng, W.; Perepelitsa, D.V.; Perera, G.D.N.; Perezlara, C.E.; Petti, R.; Phipps, M.; Pinkenburg, C.; Potekhin, M.; Pun, A.; Purschke, M.L.; Radzevich, P.V.; Ramasubramanian, N.; Read, K.F.; Riabov, V.; Riabov, Y.; Richford, D.; Rinn, T.; Rosati, M.; Rowan, Z.; Runchey, J.; Sakaguchi, T.; Sako, H.; Samsonov, V.; Sarsour, M.; Sato, K.; Sato, S.; Schaefer, B.; Schmoll, B.K.; Seidl, R.; Sen, A.; Seto, R.; Sexton, A.; Sharma, D.; Shein, I.; Shibata, M.; Shibata, T.-A.; Shigaki, K.; Shimomura, M.; Shi, Z.; Silva, C.L.; Silvermyr, D.; Slunečka, M.; Smith, K.L.; Sorensen, S.P.; Sourikova, I.V.; Stankus, P.W.; Stoll, S.P.; Sugitate, T.; Sukhanov, A.; Sun, Z.; Syed, S.; Takahama, R.; Takeda, A.; Tanida, K.; Tannenbaum, M.J.; Tarafdar, S.; Taranenko, A.; Tarnai, G.; Tieulent, R.; Timilsina, A.; Todoroki, T.; Tomášek, M.; Towell, C.L.; Towell, R.S.; Tserruya, I.; Ueda, Y.; Ujvari, B.; Van Hecke, H.W.; Vazquez-Carson, S.; Velkovska, J.; Virius, M.; Vrba, V.; Wang, X.R.; Wang, Z.; Watanabe, Y.; Wong, C.P.; Xu, C.; Xu, Q.; Yamaguchi, Y.L.; Yanovich, A.; Yin, P.; Yoon, I.; Yoo, J.H.; Yushmanov, I.E.; Yu, H.; Zajc, W.A.; Zou, L.
DOI
10.1103/PhysRevLett.134.022302
발행일
2025-01-17
유형
Article
저널명
Physical Review Letters
권
134
호
2