Probing the Partonic Degrees of Freedom in High-Multiplicity p-Pb collisions at √sNN=5.02 TeV

被引：60

作者：

Zhao, Wenbin ^{[1
,2
,3
]}

Ko, Che Ming ^{[4
,5
]}

Liu, Yu-Xin ^{[1
,2
,3
,6
]}

Qin, Guang-You ^{[7
,8
,9
]}

Song, Huichao ^{[1
,2
,3
,6
]}

机构：

[1] Peking Univ, Dept Phys, Beijing 100871, Peoples R China

[2] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

[3] Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China

[4] Texas A&M Univ, Cyclotron Inst, College Stn, TX 77843 USA

[5] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA

[6] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China

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

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

[9] Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94270 USA

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 125卷 / 07期

关键词：

RANGE ANGULAR-CORRELATIONS; PROTON-NUCLEUS COLLISIONS; LONG-RANGE; TRANSVERSE-MOMENTUM; PPB COLLISIONS; HEAVY; DEPENDENCE; FLOW; COLLECTIVITY; PLUS;

D O I：

10.1103/PhysRevLett.125.072301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the role of partonic degrees of freedom in high-multiplicity p-Pb collisions at root s(NN) = 5.02 TeV carried out at the Large Hadron Collider (LHC) by studying the production and collective flow of identified hadrons at intermediate p(T) via the coalescence of soft partons from the viscous hydrodynamics (VISH2 + 1) and hard partons from the energy loss model, linear Boltzmann transport (LBT). We find that combining these intermediate p(T) hadrons with the low p(T) hadrons from the hydrodynamically expanding fluid and high p(T) hadrons from the fragmentation of quenched jets, the resulting hydro-dynamicscoalescence-fragmentation model provides a nice description of measured p(T) spectra and differential elliptic flow v(2)(p(T)) of pions, kaons, and protons over the p(T) range from 0 to 6 GeV. We further demonstrate the necessity of including the quark coalescence contribution to reproduce the experimentally observed approximate number of constituent quark scaling of hadron v(2) at intermediate p(T). Our results thus indicate the importance of partonic degrees of freedom and also hint at the possible formation of quark-gluon plasma in high-multiplicity p-Pb collisions at the LHC.

引用

页数：6

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