検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

Forward $$J/psi$$ production in U + U collisions at $$sqrt{s_{NN}}$$ = 193 GeV

$$sqrt{s_{NN}}$$=193GeVでのウラン-ウラン衝突における前方$$J/psi$$粒子の生成

Adare, A.*; 長谷川 勝一; 今井 憲一; 永宮 正治; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他397名*

Adare, A.*; Hasegawa, Shoichi; Imai, Kenichi; Nagamiya, Shoji; Sako, Hiroyuki; Sato, Susumu; Tanida, Kiyoshi; PHENIX Collaboration*; 397 of others*

The invariant yields, $$dN/dy$$, for $$J/psi$$ production at forward rapidity ($$1.2 < |y| < 2.2$$) in U+U collisions at $$sqrt{s_{NN}}$$ = 193 GeV have been measured as a function of collision centrality. The invariant yields and nuclear-modification factor $$R_{AA}$$ are presented and compared with those from Au + Au collisions in the same rapidity range. Additionally, the direct ratio of the invariant yields from U + U and Au + Au collisions within the same centrality class is presented, and used to investigate the role of $$cbar{c}$$ coalescence. Two different parametrizations of the deformed Woods-Saxon distribution were used in Glauber calculations to determine the values of the number of nucleon-nucleon collisions in each centrality class, $$N_{rm coll}$$, and these were found to give significantly different $$N_{rm coll}$$ values. Results using $$N_{rm coll}$$ values from both deformed Woods-Saxon distributions are presented. The measured ratios show that the $$J/psi$$ suppression, relative to binary collision scaling, is similar in U + U and Au + Au for peripheral and midcentral collisions, but that $$J/psi$$ show less suppression for the most central U + U collisions. The results are consistent with a picture in which, for central collisions, increase in the $$J/psi$$ yield due to $$cbar{c}$$ coalescence becomes more important than the decrease in yield due to increased energy density. For midcentral collisions, the conclusions about the balance between $$cbar{c}$$ coalescence and suppression depend on which deformed Woods-Saxon distribution is used to determine $$N_{coll}$$.

Access

:

- Accesses

InCites™

:

パーセンタイル:52.92

分野:Physics, Nuclear

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.