Study of in-Medium Energy Loss with Heavy-Flavour Correlations in pp and Pb-Pb Collisions with ALICE at the LHC

Samrangy Sadhu

doi:10.3390/proceedings2019010043

Abstract

The azimuthal correlations between heavy-flavour hadrons or heavy-flavour decay electrons with charged particles in Pb-Pb collisions give insight on the modification of charm-jet properties in nucleus-nucleus collisions and the mechanisms through which heavy quarks in-medium energy-loss takes place. Studies in pp collisions, besides constituting the necessary baseline for nucleus-nucleus measurements, are important for testing expectations from pQCD-inspired Monte Carlo generators. In ALICE heavy-flavour hadrons are studied via their fully reconstructed hadronic decays (D mesons and Λ c baryon), via semileptonic decays of charmed baryons ( Λ c , Ξ c ) and via leptons coming from heavy-flavour hadron decays. In particular in the central barrel, η < | 0 . 8 | , the electrons from heavy-flavour hadron decays are investigated. This proceeding will include the study of azimuthal correlations of D mesons with charged particles in pp collisions and heavy-flavour decay electrons with charged particles in pp and Pb-Pb collisions at different energies available at the LHC. The Experimental results will also be compared with the expectations from POWHEG and PYTHIA event generators.

Highlights

ALICE is a dedicated experiment at the LHC to study nuclear matter at extreme conditions of high temperature and high energy density at which quarks are de-confined and gives rise to a new state of matter known as Quark-Gluon Plasma (QGP)
The contribution of D mesons coming from beauty-hadron decays is subtracted, using templates of the angular correlations of feed-down D mesons and charged particles obtained from different tunes of the PYTHIA event generator
An example plot for the azimuthal correlation distribution is shown in Figure 1 for D-mesons with pT 8–16 GeV/c and charged particle with pT > 0.3 GeV/c

Summary

Introduction

ALICE is a dedicated experiment at the LHC to study nuclear matter at extreme conditions of high temperature and high energy density at which quarks are de-confined and gives rise to a new state of matter known as Quark-Gluon Plasma (QGP). Due to their large masses, heavy quarks (charm and beauty), are produced in the early stages of the collision, via hard partonic scattering processes, and they are expected to experience the full evolution of the system propagating through the medium produced in such collisions.

Data Set and Experimental Setup

Analysis Detail

Results assoc

Summary and Outlook