Disentangling centrality bias and final-state effects in the production of high-$p_T$ $π^0$ using direct $γ$ in $d$$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV
Creators: name: Abdulameer, N. J.
name: Acharya, U.
name: Aidala, C.
name: Akiba, Y.
name: Alfred, M.
name: Aoki, K.
name: Apadula, N.
name: Ayuso, C.
name: Babintsev, V.
name: Barish, K. N.
name: Bathe, S.
name: Bazilevsky, A.
name: Belmont, R.
name: Berdnikov, A.
name: Berdnikov, Y.
name: Bichon, L.
name: Blankenship, B.
name: Blau, D. S.
name: Boer, M.
name: Bok, J. S.
name: Borisov, V.
name: Brooks, M. L.
name: Bryslawskyj, J.
name: Bumazhnov, V.
name: Butler, C.
name: Campbell, S.
name: Roman, V. Canoa
name: Chiu, M.
name: Connors, M.
name: Corliss, R.
name: Morales, Y. Corrales
name: Csanád, M.
name: Csörgő, T.
name: Liu, L. D.
name: Danley, T. W.
name: Daugherity, M. S.
name: David, G.
name: Dean, C. T.
name: DeBlasio, K.
name: Dehmelt, K.
name: Denisov, A.
name: Deshpande, A.
name: Desmond, E. J.
name: Doomra, V.
name: Do, J. H.
name: Drees, A.
name: Drees, K. A.
name: Dumancic, M.
name: Durham, J. M.
name: Durum, A.
name: Elder, T.
name: Enokizono, A.
name: Esha, R.
name: Fadem, B.
name: Fan, W.
name: Feege, N.
name: Finger,, M.
name: Finger, M.
name: Firak, D.
name: Fitzgerald, D.
name: Fokin, S. L.
name: Frantz, J. E.
name: Franz, A.
name: Frawley, A. D.
name: Fukuda, Y.
name: Gal, C.
name: Garg, P.
name: Ge, H.
name: Giles, M.
name: Goto, Y.
name: Grau, N.
name: Greene, S. V.
name: Gunji, T.
name: Hachiya, T.
name: Haggerty, J. S.
name: Hahn, K. I.
name: Han, S. Y.
name: Harvey, M.
name: Hasegawa, S.
name: Haseler, T. O. S.
name: Hemmick, T. K.
name: He, X.
name: Hill, K.
name: Hodges, A.
name: Homma, K.
name: Hong, B.
name: Hoshino, T.
name: Hotvedt, N.
name: Huang, J.
name: Imrek, J.
name: Inaba, M.
name: Isenhower, D.
name: Ito, Y.
name: Ivanishchev, D.
name: Jacak, B. V.
name: Ji, Z.
name: Johnson, B. M.
name: Jorjadze, V.
name: Jouan, D.
name: Jumper, D. S.
name: Kang, J. H.
name: Kapukchyan, D.
name: Karthas, S.
name: Kazantsev, A. V.
name: Khachatryan, V.
name: Khanzadeev, A.
name: Khatiwada, A.
name: Kim, C.
name: Kim, D. J.
name: Kim, E. -J.
name: Kim, M.
name: Kim, M. H.
name: Kim, T.
name: Kincses, D.
name: Kingan, A.
name: Kistenev, E.
name: Koblesky, T.
name: Kotov, D.
name: Kovacs, L.
name: Kudo, S.
name: Kurgyis, B.
name: Kurita, K.
name: Lajoie, J. G.
name: Lallow, E. O.
name: Larionova, D.
name: Lebedev, A.
name: Lee, S. H.
name: Leitch, M. J.
name: Leung, Y. H.
name: Lewis, N. A.
name: Lim, S. H.
name: Liu, M. X.
name: Li, X.
name: Loggins, V. -R.
name: Loomis, D. A.
name: Lynch, D.
name: Lökös, S.
name: Majoros, T.
name: Makek, M.
name: Malaev, M.
name: Manko, V. I.
name: Mannel, E.
name: Masuda, H.
name: McCumber, M.
name: McGlinchey, D.
name: Mignerey, A. C.
name: Mihalik, D. E.
name: Milov, A.
name: Mishra, D. K.
name: Mitchell, J. T.
name: Mitrankova, M.
name: Mitrankov, Iu.
name: Mitsuka, G.
name: Mondal, M. M.
name: Moon, T.
name: Morrison, D. P.
name: Morrow, S. I.
name: Muhammad, A.
name: Mulilo, B.
name: Murakami, T.
name: Murata, J.
name: Nagai, K.
name: Nagashima, K.
name: Nagashima, T.
name: Nagle, J. L.
name: Nagy, M. I.
name: Nakagawa, I.
name: Nakagomi, H.
name: Nakano, K.
name: Nattrass, C.
name: Nelson, S.
name: Nouicer, R.
name: Novitzky, N.
name: Novotny, R.
name: Novák, T.
name: Nukazuka, G.
name: Nyanin, A. S.
name: O'Brien, E.
name: Ogilvie, C. A.
name: Oh, J.
name: Koop, J. D. Orjuela
name: Orosz, M.
name: Osborn, J. D.
name: Oskarsson, A.
name: Ozawa, K.
name: Pantuev, V.
name: Papavassiliou, V.
name: Park, J. S.
name: Park, S.
name: Patel, M.
name: Pate, S. F.
name: Peng, W.
name: Perepelitsa, D. V.
name: Perera, G. D. N.
name: PerezLara, C. E.
name: Petti, R.
name: Phipps, M.
name: Pinkenburg, C.
name: Potekhin, M.
name: Pun, A.
name: Purschke, M. L.
name: Radzevich, P. V.
name: Ramasubramanian, N.
name: Read, K. F.
name: Riabov, V.
name: Riabov, Y.
name: Richford, D.
name: Rinn, T.
name: Rosati, M.
name: Rowan, Z.
name: Runchey, J.
name: Sakaguchi, T.
name: Sako, H.
name: Samsonov, V.
name: Sarsour, M.
name: Sato, K.
name: Sato, S.
name: Schaefer, B.
name: Schmoll, B. K.
name: Seidl, R.
name: Sen, A.
name: Seto, R.
name: Sexton, A.
name: Sharma, D.
name: Shein, I.
name: Shibata, M.
name: Shibata, T. -A.
name: Shigaki, K.
name: Shimomura, M.
name: Shi, Z.
name: Silva, C. L.
name: Silvermyr, D.
name: Slunečka, M.
name: Smith, K. L.
name: Sorensen, S. P.
name: Sourikova, I. V.
name: Stankus, P. W.
name: Stoll, S. P.
name: Sugitate, T.
name: Sukhanov, A.
name: Sun, Z.
name: Syed, S.
name: Takahama, R.
name: Takeda, A.
name: Tanida, K.
name: Tannenbaum, M. J.
name: Tarafdar, S.
name: Taranenko, A.
name: Tarnai, G.
name: Tieulent, R.
name: Timilsina, A.
name: Todoroki, T.
name: Tomášek, M.
name: Towell, C. L.
name: Towell, R. S.
name: Tserruya, I.
name: Ueda, Y.
name: Ujvari, B.
name: van Hecke, H. W.
name: Vazquez-Carson, S.
name: Velkovska, J.
name: Virius, M.
name: Vrba, V.
name: Wang, X. R.
name: Wang, Z.
name: Watanabe, Y.
name: Wong, C. P.
name: Xu, C.
name: Xu, Q.
name: Yamaguchi, Y. L.
name: Yanovich, A.
name: Yin, P.
name: Yoon, I.
name: Yoo, J. H.
name: Yushmanov, I. E.
name: Yu, H.
name: Zajc, W. A.
name: Zou, L.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: PHENIX presents a simultaneous measurement of the production of direct $γ$ and $π^0$ in $d$$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV over a $p_T$ range of 7.5 to 18 GeV/$c$ for different event samples selected by event activity, i.e. charged-particle multiplicity detected at forward rapidity. Direct-photon yields are used to empirically estimate the contribution of hard-scattering processes in the different event samples. Using this estimate, the average nuclear-modification factor $R_{d\rm Au,EXP}^{γ^{\rm dir}}$ is $0.925{\pm}0.023({\rm stat}){\pm}0.15^{\rm (scale)}$, consistent with unity for minimum-bias (MB) $d$$+$Au events. For event classes with moderate event activity, $R_{d\rm Au,EXP}^{γ^{\rm dir}}$ is consistent with the MB value within 5\% uncertainty. These results confirm that the previously observed enhancement of high-$p_T$ $π^0$ 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, $R_{d\rm Au,EXP}^{γ^{\rm dir}}$ is suppressed by 20\% relative to the MB value with a significance of $4.5σ$, which may be due to final-state effects.
description: 279 authors from 69 institutions, 8 pages, 3 figures, v2 is version accepted for publication in Physical Review Letters. HEPdata tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html