Azimuthal angular correlations between heavy-flavour decay particles and charged hadrons in pp collisions in ALICE

TL;DR

This paper investigates azimuthal angular correlations between heavy-flavour decay particles and charged hadrons in proton-proton collisions at different energies to understand heavy quark production and fragmentation.

Contribution

It provides new measurements of heavy-flavour decay electron fractions, beauty production cross sections, and correlation analyses at 2.76 TeV and 7 TeV, comparing results with QCD predictions.

Findings

Fraction of electrons from beauty-hadron decays determined.

Beauty production cross section measured at 2.76 TeV.

Correlation analysis of D* mesons and hadrons performed.

Abstract

Heavy quarks produced in pp and heavy ion collisions are studied using heavy-flavour decay electrons and heavy-flavour mesons. Detailed understanding of the production processes and fragmentation of heavy quarks can be obtained by studying the azimuthal angular correlation of heavy-flavour hadrons. The azimuthal angular correlations of heavy-flavour mesons and charged hadrons can be used to disentangle charm and beauty-hadrons in pp collisions. In this contribution the fraction of electrons from beauty-hadron decays in the heavy-flavour decay electron yield is shown as well as the beauty production cross section in pp collisions at $\sqrt\textrm{s}$ = 2.76 TeV. The measurements are compared to the predictions from next-to leading order perturbative QCD calculations. We also show the results from correlation analysis of charged $\mathrm{D}^{*}$ mesons and hadrons performed using pp collision data at $\sqrt{\textrm{s}}$ = 7 TeV.