Elliptic Flow of Heavy Quarkonia in pA Collisions

被引：39

作者：

Zhang, Cheng ^{[1
,2
]}

Marquet, Cyrille ^{[3
]}

Qin, Guang-You ^{[1
,2
]}

Wei, Shu-Yi ^{[3
]}

Xiao, Bo-Wen ^{[1
,2
,3
]}

机构：

[1] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China

[2] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China

[3] Univ Paris Saclay, CNRS, Ecole Polytech, CPHT, F-91128 Palaiseau, France

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 17期

关键词：

PB COLLISIONS; ANGULAR-CORRELATIONS; PPB COLLISIONS; LONG-RANGE; PLUS PB; COLLECTIVITY; HARMONICS; SIDE;

D O I：

10.1103/PhysRevLett.122.172302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using the dilute-dense factorization in the color glass condensate framework, we investigate the azimuthal angular correlation between a heavy quarkonium and a charged light hadron in proton-nucleus collisions. We extract the second harmonic nu(2), commonly known as the elliptic flow, with the light hadron as the reference. This particular azimuthal angular correlation between a heavy meson and a light hadron was first measured at the LHC recently. The experimental results indicate that the elliptic flows for heavy flavor mesons (J/psi and D-0) are almost as large as those for light hadrons. Our calculation demonstrates that this result can be naturally interpreted as an initial state effect due to the interaction between the incoming partons from the proton and the dense gluons inside the target nucleus. Since the heavy quarkonium nu(2) exhibits a weak mass dependence according to our calculation, we predict that the heavy quarkonium Upsilon should have a similar elliptic flow as compared to that of the J/psi, which can be tested in future measurements.

引用

页数：6

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