NLO Productions of $$\omega $$ ω and $$K^0_{\mathrm{S}}$$ KS0 with a global extraction of the jet transport parameter in heavy-ion collisions

Abstract

Abstract In this work, we pave the way to calculate the productions of $$\omega $$ ω and $$K^0_{\mathrm{S}}$$ KS0 mesons with large $$p_T$$ pT in p+p and A+A collisions both at RHIC and LHC. The fragmentation functions (FFs) of the $$\omega $$ ω meson in vacuum at next-to-leading order (NLO) are obtained by evolving the NLO DGLAP evolution equations with rescaled $$\omega $$ ω FFs at initial scale $$Q_0^2=1.5$$ Q02=1.5 $$\hbox {GeV}^2$$ GeV2 from a broken SU(3) model, and the FFs of $$K^0_{\mathrm{S}}$$ KS0 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 $$\omega $$ ω and $$K^0_{\mathrm{S}}$$ KS0 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 $$\omega $$ ω meson and $$K^0_{\mathrm{S}}$$ KS0 meson both at RHIC and LHC are presented with different sets of jet transport coefficients $${\hat{q}}_0$$ q^0 . Then we make a global extraction of $${\hat{q}}_0$$ q^0 both at RHIC and LHC by confronting our model calculations with all available data on six identified mesons: $$\pi ^0$$ π0 , $$\eta $$ η , $$\rho ^0$$ ρ0 , $$\phi $$ ϕ , $$\omega $$ ω , and $$K^0_{\mathrm{S}}$$ KS0 . The minimum value of total $$\chi ^2/d.o.f$$ χ2/d.o.f for productions of these mesons gives the best value of $${\hat{q}}_0=0.5\mathrm ~GeV^2/fm$$ q^0=0.5GeV2/fm for Au+Au collisions with $$\sqrt{s_{\mathrm{NN}}}=200$$ sNN=200 GeV at RHIC, and $${\hat{q}}_0=1.2\mathrm ~GeV^2/fm$$ q^0=1.2GeV2/fm for Pb+Pb collisions with $$\sqrt{s_{\mathrm{NN}}}=2.76$$ sNN=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 $${\hat{q}}_0$$ q^0 , nuclear modification factors of $$\pi ^0$$ π0 , $$\eta $$ η , $$\rho ^0$$ ρ0 , $$\phi $$ ϕ , $$\omega $$ ω , and $$K^0_{\mathrm{S}}$$ KS0 in A+A collisions are presented, and predictions of yield ratios such as $$\omega /\pi ^0$$ ω/π0 and $$K^0_{\mathrm{S}}/\pi ^0$$ KS0/π0 at the high-$$p_T$$ pT regime in heavy-ion collisions both at RHIC and LHC are provided.