Heavy flavour suppression and flow

TL;DR

This paper calculates the energy loss and flow of heavy quarks in quark-gluon plasma, successfully matching experimental data from RHIC using a pQCD-based model.

Contribution

It introduces a comprehensive calculation of heavy quark transport coefficients including radiative and collisional processes, and solves the FP equation to explain experimental observations.

Findings

Reproduces RHIC data on nuclear suppression factor $R_{AA}$ and elliptic flow $v_2^{HF}$.

Includes effects like LPM and dead cone in radiative energy loss.

Demonstrates pQCD framework's effectiveness in modeling heavy quark dynamics.

Abstract

The drag and diffusion coefficients of charm and bottom quarks propagating through quark gluon plasma have been evaluated for conditions relevant to nuclear collisions at Large Hadron Collider and Relativistic Heavy Ion Collider. Both the radiative and collisional processes of energy loss are included in evaluating the {\it effective} drag and diffusion coefficients. The Landau-Pomeronchuk-Migdal (LPM) and the dead cone effects on the radiative energy loss of heavy quarks have been included. With the effective transport coefficients the Fokker Plank (FP) equation has been solved for the evolution of heavy quarks in QGP. The solution of the FP equation has been used to evaluate the nuclear suppression factor, $R_{\mathrm AA}$ and the elliptic flow, $v_2^{HF}$ for the non-photonic single electron spectra resulting from the semi-leptonic decays of hadrons containing charm and bottom quarks. It is observed that the experimental data from RHIC on $R_{\mathrm AA}$ and $v_2^{HF} $ can be reproduced simultaneously within the pQCD framework for the same set of inputs.