Directed flow of charm quarks as a witness of the initial strong magnetic field in ultra-relativistic heavy ion collisions

被引：169

作者：

Das, Santosh K. ^{[1
]}

Plumari, S. ^{[1
,2
]}

Chatterjee, S. ^{[3
,4
]}

Alam, J. ^{[3
]}

Scardina, F. ^{[1
,2
]}

Greco, V. ^{[1
,2
]}

机构：

[1] Univ Catania, Dept Phys & Astron, Via S Sofia 64, I-95125 Catania, Italy

[2] INFN LNS, Lab Nazl Sud, Via S Sofia 62, I-95123 Catania, Italy

[3] Variable Energy Cyclotron Ctr HBNI, 1-AF Bidhan Nagar, Kolkata 700064, India

[4] Natl Inst Sci Educ & Res, Sch Phys Sci, Jatni 752050, India

来源：

PHYSICS LETTERS B | 2017年 / 768卷

基金：

欧洲研究理事会;

关键词：

ELLIPTIC FLOW; TRANSPORT; FLAVOR; EVENT; AA;

D O I：

10.1016/j.physletb.2017.02.046

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Ultra-relativistic Heavy-Ion Collision (HIC) generates very strong initial magnetic field ((B) over right arrow) inducing a vorticity in the reaction plane. The high (B) over right arrow influences the evolution dynamics that is opposed by the large Faraday current due to electric field generated by the time varying (B) over right arrow. We show that the resultant effects entail a significantly large directed flow (v(1)) of charm quarks (CQs) compared to light quarks due to a combination of several favorable conditions for CQs, mainly: (i) unlike light quarks formation time scale of CQs, tau(f) similar or equal to 0.1 fm/c is comparable to the time scale when (B) over right arrow attains its maximum value and (ii) the kinetic relaxation time of CQs is similar to the QGP lifetime, this helps the CQ to retain the initial kick picked up from the electromagnetic field in the transverse direction. The effect is also odd under charge exchange allowing to distinguish it from the vorticity of the bulk matter due to the initial angular momentum conservation; conjointly thanks to its mass, M-c >> Lambda(QCD), there should be no mixing with the chiral magnetic dynamics. Hence CQs provide very crucial and independent information on the strength of the magnetic field produced in HIC. (C) 2017 The Author(s). Published by Elsevier B.V.

引用

页码：260 / 264

页数：5

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