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ID 45821
本文ファイル
著者
PHENIX Collaboration
Enokizono, A.
Hachiya, T.
Harada, H.
Haruna, K.
Homma, Kensuke 大学院理学研究科 広大研究者総覧
Horaguchi, T.
Iwanaga, Y.
Kijima, K. M.
Nakamiya, Y.
Nakamura, T.
Nihashi, M.
Ouchida, M.
Sakata, H.
Shigaki, Kenta 大学院理学研究科 広大研究者総覧
Sugitate, Toru 大学院理学研究科 広大研究者総覧
Torii, H.
Tsuchimoto, Y.
Watanabe, D.
Yamaura, K.
NDC
物理学
抄録(英)
The PHENIX experiment at the Relativistic Heavy Ion Collider has performed systematic measurements of φ meson production in the K+K− decay channel at midrapidity in p + p, d + Au, Cu + Cu, and Au + Au collisions at √sNN = 200 GeV. Results are presented on the φ invariant yield and the nuclear modification factor RAA for Au + Au and Cu + Cu, and RdA for d + Au collisions, studied as a function of transverse momentum (1 < pT < 7 GeV/c) and centrality. In central and midcentral Au + Au collisions, the RAA of φ exhibits a suppression relative to expectations from binary scaled p + p results. The amount of suppression is smaller than that of the π0 and the η in the intermediate pT range (2–5 GeV/c), whereas, at higher pT , the φ, π0, and η show similar suppression. The baryon (proton and antiproton) excess observed in central Au + Au collisions at intermediate pT is not observed for the φ meson despite the similar masses of the proton and the φ. This suggests that the excess is linked to the number of valence quarks in the hadron rather than its mass. The difference gradually disappears with decreasing centrality, and, for peripheral collisions, the RAA values for both particle species are consistent with binary scaling. Cu + Cu collisions show the same yield and suppression as Au + Au collisions for the same number of Npart. The RdA of φ shows no evidence for cold nuclear effects within uncertainties.
掲載誌名
Physical Review C
83巻
2号
開始ページ
024909-1
終了ページ
024909-10
出版年月日
2011-02-18
出版者
American Physical Society
ISSN
0556-2813
2469-9985
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
Copyright (c) 2011 American Physical Society
部局名
理学研究科