γ -hadron spectra in p + Pb collisions at s N N = 5.02 TeV

Xie, Man; Wang, Xin-Nian; Zhang, Han-Zhong

doi:10.1103/PhysRevC.103.034911

Title: $γ$ -hadron spectra in $p + Pb$ collisions at $\sqrt{s_{N N}} = 5.02$ TeV

Journal Article · Mon Mar 29 00:00:00 EDT 2021 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.103.034911· OSTI ID:1773191

;

; Zhang, Han-Zhong

Under the assumption that a quark-gluon plasma (QGP) droplet is produced and its evolution can be described by hydrodynamics in p+A collisions, γ-triggered hadron spectra are studied within a next-to-leading-order perturbative QCD parton model with the medium-modified parton fragmentation functions. The initial conditions and space-time evolution of the small QGP droplet are provided by the superSONIC hydrodynamic model simulations and parton energy loss in such a medium is described by the high-twist (HT) approach. The range of scaled jet transport coefficient $$\hat{q}_0/T^3_0$$ in this HT approach is extracted from single hadron suppression in A+A collisions with similar initial medium temperature as in p+A collisions. Numerical results for this scenario show that γ-hadron spectra at $$p^γ_T=12-40GeV/c$$ are suppressed by 5-15% in the most central 0-10% p+Pb collisions at $$\sqrt{s_{NN}}$$=5.02 TeV. The suppression becomes weaker at higher transverse momentum of the γ trigger. As a comparison, γ-hadron suppression in Pb+Pb collisions at $$\sqrt{s_{NN}}$$=2.76 and 5.02 TeV is also predicted.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: AC02-05CH11231; 11935007; 11221504; 11890714; ACI-1550228

OSTI ID:: 1773191

Alternate ID(s):: OSTI ID: 1813362

Journal Information:: Physical Review C, Journal Name: Physical Review C Vol. 103 Journal Issue: 3; ISSN 2469-9985

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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