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

Zhao, Wenbin; Ko, Che Ming; Liu, Yu-Xin; Qin, Guang-You; Song, Huichao

doi:10.1103/physrevlett.125.072301

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

Journal Article · Wed Aug 12 00:00:00 EDT 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.125.072301· OSTI ID:1647342

^[1]; ^[2]; Liu, Yu-Xin ^[3]; ^[4]; ^[3]

Peking Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China); Texas A&M University
Texas A & M Univ., College Station, TX (United States)
Peking Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Central China Normal University, Hubei (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

We investigate the role of partonic degrees of freedom in high-multiplicity p–Pb collisions at √^sNN = 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 (VISH 2 + 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-dynamics-coalescence-fragmentation model provides a nice description of measured p_T spectra and differential elliptic flow v₂ (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 v₂ at intermediate p_T. Furthermore, 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.

View Accepted Manuscript (DOE)

Research Organization:: Texas A & M Univ., College Station, TX (United States)

Sponsoring Organization:: CSC; MOST; NSFC; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0015266

OSTI ID:: 1647342

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 7 Vol. 125; ISSN 1079-7114; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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