Abstract
In this work, we pave the way to calculate the productions of omega and K^0_{mathrm{S}} mesons with large p_T in p+p and A+A collisions both at RHIC and LHC. The fragmentation functions (FFs) of the omega meson in vacuum at next-to-leading order (NLO) are obtained by evolving the NLO DGLAP evolution equations with rescaled omega FFs at initial scale Q_0^2=1.5 hbox {GeV}^2 from a broken SU(3) model, and the FFs of K^0_{mathrm{S}} in vacuum are taken from AKK08 parametrization directly. Within the framework of the NLO pQCD improved parton model, we arrive at good descriptions of the experimental data on omega and K^0_{mathrm{S}} in p+p both at RHIC and LHC. With the higher-twist approach, to take into account jet quenching effect by medium-modified FFs, nuclear modification factors for omega meson and K^0_{mathrm{S}} meson both at RHIC and LHC are presented with different sets of jet transport coefficients {hat{q}}_0. Then we make a global extraction of {hat{q}}_0 both at RHIC and LHC by confronting our model calculations with all available data on six identified mesons: pi ^0, eta , rho ^0, phi , omega , and K^0_{mathrm{S}}. The minimum value of total chi ^2/d.o.f for productions of these mesons gives the best value of {hat{q}}_0=0.5mathrm ~GeV^2/fm for Au+Au collisions with sqrt{s_{mathrm{NN}}}=200 GeV at RHIC, and {hat{q}}_0=1.2mathrm ~GeV^2/fm for Pb+Pb collisions with sqrt{s_{mathrm{NN}}}=2.76 TeV at LHC, respectively, with the QGP spacetime evolution given by the event-by-event viscous hydrodynamics model IEBE-VISHNU. With these global extracted values of {hat{q}}_0, nuclear modification factors of pi ^0, eta , rho ^0, phi , omega , and K^0_{mathrm{S}} in A+A collisions are presented, and predictions of yield ratios such as omega /pi ^0 and K^0_{mathrm{S}}/pi ^0 at the high-p_T regime in heavy-ion collisions both at RHIC and LHC are provided.
Highlights
The jet quenching effect describes energy dissipation of an energetic parton when it traverses through the hot and dense QCD medium, which is produced shortly after high energy nuclear collisions [1]
The single hadron production suppression at the high- pT regime when compared to scaled p+p data is one of the primary perturbative probes to study the properties of this de-coupled quark and gluon QCD matter [2]. π 0 is the best measured final-state hadron, and its nuclear modification factor RAA as a function of transverse momentum pT is interpreted as the consequence of the jet quenching effect and it did help us to constrain the strength of the jet–medium interaction and the properties of the QCD medium [3,4,5,6,7,8,9]
The RAA for different final-state identified hadrons have been measured, and their production suppressions as well as patterns of their yield ratios have been observed [4,5,11,12,13,14,15,16]. It is of interest and it is a challenge to describe the cross sections of leading hadrons of different types and their yield ratios with each other in heavy-ion collisions (HIC) both at RHIC and LHC with a unified model of jet quenching, which should shed light on the flavor dependence of the parton energy loss and the intrinsic properties of the identified hadron productions in p+p and A+A reactions [17,18,19,20,21,22,23,24]
Summary
The jet quenching effect describes energy dissipation of an energetic parton when it traverses through the hot and dense QCD medium, which is produced shortly after high energy nuclear collisions [1]. RAA as functions of pT at q0 = 0.4 − 0.7 GeV2/fm confronted with the experimental data of [4, 5], With these two cautions in mind, and realizing that with our model we are ready to make a systematic study of six types of identified mesons such as π 0, η, ρ0, φ, ω, and in heavy-ion collisions, it will be of great interest to make a global extraction of the jet transport coefficient q0 both at RHIC and LHC by confronting our model calculations (with the IEBE-VISHNU hydro model) against all available data on six identified mesons: π 0, η, ρ0, φ, ω, and KS0, and make precise calculations on the nuclear modification factors of these mesons including ω, and KS0, and the yield ratios of these six mesons in HIC
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