Measurement of J/ψ at forward and backward rapidity in p+p , p+Al , p+Au , and He3+Au collisions at sNN=200 GeV

U. Acharya, A. Adare, C. Aidala, N. Ajitanand, Y. Akiba, M. Alfred, V. Andrieux, N. Apadula, H. Asano, B. Azmoun, V. Babintsev, M. Bai, N. Bandara, B. Bannier, K. Barish, S. Bathe, A. Bazilevsky, M. Beaumier, S. Beckman, R. Belmont, A. Berdnikov, Y. Berdnikov, D. Blau, M. Boer, J. Bok, K. Boyle, M. Brooks, J. Bryslawskyj, V. Bumazhnov, S. Campbell, V. C. Roman, R. Cervantes, C. Chen, C. Chi, M. Chiu, I. Choi, J. Choi, T. Chujo, Z. Citron, M. Connors, N. Cronin, M. Csanád, T. CsorgHo, T. Danley, A. Datta, M. Daugherity, G. David, K. DeBlasio, K. Dehmelt, A. Denisov, A. Deshpande, E. Desmond, A. Dion, P. B. Diss, D. Dixit, J. Do, A. Drees, K. Drees, J. Durham, A. Durum, A. Enokizono, H. En’yo, R. Esha, S. Esumi, B. Fadem, W. Fan, N. Feege, D. Fields, M. Finger, Jr., D. Fitzgerald, S. Fokin, J. Frantz, A. Franz, A. Frawley, Y. Fukuda, C. Gal, P. Gallus, E. Gamez, P. Garg, H. Ge, F. Giordano, A. Glenn, Y. Goto, N. Grau, S. Greene, M. Perdekamp, T. Gunji, H. Guragain, T. Hachiya, J. Haggerty, K. Hahn, H. Hamag
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引用次数: 11

Abstract

Charmonium is a valuable probe in heavy-ion collisions to study the properties of the quark gluon plasma, and is also an interesting probe in small collision systems to study cold nuclear matter effects, which are also present in large collision systems. With the recent observations of collective behavior of produced particles in small system collisions, measurements of the modification of charmonium in small systems have become increasingly relevant. We present the results of $J/\psi$ measurements at forward and backward rapidity in various small collision systems, $p$$+$$p$, $p$$+$Al, $p$$+$Au and $^3$He$+$Au, at $\sqrt{s_{_{NN}}}$=200 GeV. The results are presented in the form of the observable $R_{AB}$, the nuclear modification factor, a measure of the ratio of the $J/\psi$ invariant yield compared to the scaled yield in $p$$+$$p$ collisions. We examine the rapidity, transverse momentum, and collision centrality dependence of nuclear effects on $J/\psi$ production with different projectile sizes $p$ and $^3$He, and different target sizes Al and Au. The modification is found to be strongly dependent on the target size, but to be very similar for $p$$+$Au and $^{3}$He$+$Au. However, for 0%--20% central collisions at backward rapidity, the modification for $^{3}$He$+$Au is found to be smaller than that for $p$$+$Au, with a mean fit to the ratio of $0.89\pm0.03$(stat)${\pm}0.08$(syst), possibly indicating final state effects due to the larger projectile size.
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sNN= 200gev下p+p, p+Al, p+Au和He3+Au碰撞中正向和反向速度J/ψ的测量
Charmonium是重离子碰撞中研究夸克胶子等离子体性质的有价值的探针,也是小型碰撞系统中研究冷核物质效应的有趣探针,这种效应也存在于大型碰撞系统中。随着最近对小系统碰撞中产生的粒子的集体行为的观察,测量小系统中调和的修饰变得越来越重要。在$\sqrt{s_{_{NN}}}$ =200 GeV的情况下,我们给出了$J/\psi$在各种小型碰撞系统$p$$+$$p$、$p$$+$ Al、$p$$+$ Au和$^3$ He $+$ Au中向前和向后速度的测量结果。结果以可观测值$R_{AB}$的形式呈现,即核修饰因子,即$p$$+$$p$碰撞中$J/\psi$不变产率与缩放产率之比的度量。我们研究了不同弹丸尺寸$p$和$^3$ He以及不同靶尺寸Al和Au的核效应对$J/\psi$生产的快速性、横向动量和碰撞中心性的依赖。发现这种修饰强烈依赖于目标尺寸,但对于$p$$+$ Au和$^{3}$ He $+$ Au来说非常相似。然而,对于0%--20% central collisions at backward rapidity, the modification for $^{3}$He$+$Au is found to be smaller than that for $p$$+$Au, with a mean fit to the ratio of $0.89\pm0.03$(stat)${\pm}0.08$(syst), possibly indicating final state effects due to the larger projectile size.
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