Balance functions of (un)identified hadrons in Pb--Pb, p--Pb, and pp collisions at the LHC

Abstract

In ultrarelativistic heavy-ion collisions, correlations of particles with opposite quantum numbers provide insight into quark production mechanisms and time scales, collective motion, and re-scattering in the hadronic phase. The longitudinal and azimuthal widths of balance functions for charged kaons and charged pions are used to examine the two-wave quark production model proposed to explain quark-antiquark production within the QGP, which predicts a large increase in up and down quark pairs relative to strange quark pairs around the time of hadronization. Balance functions are also analyzed in small collision systems such as p--Pb and pp to study fragmentation effects and possible collective effects in high-multiplicity events. A comprehensive set of balance functions has been measured using the ALICE detector, including results for unidentified hadrons in Pb--Pb and p--Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV, for charged pions in Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV, p--Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV and pp collisions at $\sqrt{s}=7$ TeV, and for charged kaons in Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV. The first balance function yield results are also presented.

References in corpus (10)

• Performance of the ALICE Experiment at the CERN LHC
• Centrality dependence of $\pi$, K, p production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Clocking hadronization in relativistic heavy ion collisions with balance functions
• Balance Functions from Au+Au, d+Au, and p+p Collisions at $\sqrt{s_{NN}}$ = 200 GeV
• Multiplicity and transverse momentum evolution of charge-dependent correlations in pp, p-Pb, and Pb-Pb collisions at the LHC
• The balance functions in azimuthal angle is a measure of the transverse flow
• Identifying the Charge Carriers of the Quark-Gluon Plasma
• Removing Distortions from Charge Balance Functions
• Causal Electric Charge Diffusion and Balance Functions in Relativistic Heavy Ion Collisions
• Correcting Correlation Function Measurements

Cited by in corpus (4)

• Charge Balance Functions for Heavy-Ion Collisions at LHC Energies
• Toward a description of the centrality dependence of the charge balance function in the HYDJET++ model
• Using Baryonic Charge Balance Functions to Resolve Questions about the Baryo-Chemistry of the QGP
• The Interplay of Femtoscopic and Charge-Balance Correlations