D0 Meson Production in Heavy Ion Collisions in CMS experiment

Jing Wang

doi:10.1088/1742-6596/779/1/012026

Abstract

The measurement of heavy flavour production is a powerful tool to study the properties of the high-density QCD medium created in heavy-ion collisions as heavy quarks are sensitive to the transport properties of the medium and may interact with the QCD matter differently from light quarks. In particular, the comparison between the nuclear modification factors of light and heavy flavoured particles provides insights into the expected flavour dependence of in-medium parton energy loss. With the CMS detector, the D0 meson production is studied in pp and PbPb collisions at 2.76 and 5.02 TeV. In this talk, the nuclear modification factor of D0 meson are presented and compared to the charged hadron nuclear modification factor and theoretical calculations.

Highlights

Heavy quarks are considered to be produced mainly via initial hard scatterings in heavy ion collisions
That makes heavy flavor hadrons good probes of the properties of QCD matter and important tools to study the mechanism of interaction with the matter
The pp reference used for this result was built using both FONLL [6] and data extrapolation: in the range pT < 16 GeV/c range, the ALICE collaboration measurement of prompt D0 cross-section at 7 TeV [7] was rescaled to 2.76 TeV using FONLL input, following the same procedure used in Ref. [8]

Summary

Introduction

Heavy quarks are considered to be produced mainly via initial hard scatterings in heavy ion collisions. They propagate through the medium and carry information about the system at early stage. The radiative energy loss is thought to be suppressed, the manifestation of the ‘dead cone effect’ [1]. If only this effect would be dominant, the nuclear modification factor of heavy flavor hadrons should be larger (less suppression) than that of light hadrons. The pp reference used for this result was built using both FONLL [6] and data extrapolation: in the range pT < 16 GeV/c range, the ALICE collaboration measurement of prompt D0 cross-section at 7 TeV [7] was rescaled to 2.76 TeV using FONLL input, following the same procedure used in Ref. [8]

Open markers

Preliminary