Abstract
The radial distribution of D^0 mesons in jets probes the diffusion of charm quark relative to the jet axis and provides a new perspective to study the interaction mechanisms between heavy quarks and the medium in the nucleus-nucleus collisions. The in-medium parton propagations are described by a Monte Carlo transport model which uses the next-to-leading order (NLO) plus parton shower (PS) event generator SHERPA as input and includes elastic (collisional) and inelastic (radiative) interaction for heavy quarks as well as light partons. At low D^0 meson p_T, the radial distribution significantly shifts to larger radius indicating a strong diffusion effect which is consistent with the recent experimental data. We demonstrate that the angular deviation of charm quarks declines with p_T and is very sensitive to the collisional more than radiative interaction at p_T<5 GeV. As predictions, we present the D^0 meson radial distribution in jets in p + p and 0{-}10% Au + Au collisions at sqrt{s_{NN}}=200 GeV at the RHIC, and also estimate the nuclear modification factor of charm jet in central Au + Au collisions at 200 GeV at the RHIC and central Pb + Pb collisions at 5.02 TeV at the LHC.
Highlights
(MQ T ), the heavy flavor production is set by the initial hard scattering before the quark-gluon plasma (QGP) formed in A + A collisions while the subsequent thermal generation in the hot and dense medium could be negligible [23,24]
With a Monte Carlo (MC) transport simulation combining elastic and inelastic interaction of the energetic heavy quarks with the hot and dense medium, employing a next-to-leading order (NLO) plus parton shower (PS) generated initial events as input, we study the in-medium modification of the radial distribution of D0 meson in jets both at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC)
The ratios increase with r and the magnitude are well consistent with the CMS measurement both for low pT and high pT D0 mesons
Summary
The experimental measurements including the nuclear modification factor RAA [25,26,27] and the azimuthal anisotropy v2 [28,29,30,31] for charmed hadrons in both Au-Au at the RHIC and Pb + Pb collisions at the LHC show a strong interaction between the charm quarks and the QGP formed in A + A collisions. With a Monte Carlo (MC) transport simulation combining elastic (collisional) and inelastic (radiative) interaction of the energetic heavy (light) quarks with the hot and dense medium, employing a next-to-leading order (NLO) plus parton shower (PS) generated initial events as input, we study the in-medium modification of the radial distribution of D0 meson in jets both at the RHIC and the LHC. 3. In Sect., we will present our calculations of the radial distribution of D0 meson in jets in p + p and Pb + Pb collisions and compare them with the recent preliminary experimental data. As for the low pT D0 meson, charm quarks can be produced by the gluon splitting (GSP) processes during the initial or final state parton shower and unlikely lead the high pT jets with pTjet > 60 GeV.
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