p/pi Ratio in Di-Hadron Correlations

Abstract

Particle ratios are important observables used to constrain models of particle production in heavy-ion collisions. In this work we report on a measurement of the p/pi ratio in the transverse momentum range 2.0 < p_{T,assoc} < 4.0 GeV/c, associated with a charged trigger particle of 5.0 < p_{T,trig} < 10.0 GeV/c, in 0-10% central Pb--Pb collisions at sqrt{s_{NN}}=2.76 TeV. The ratio is measured in the jet peak and in a region at large Delta eta separation from the peak (bulk region). The presented results are based on 14M minimum-bias Pb--Pb collisions, recorded by the ALICE detector. It is observed that the p/pi ratio in the bulk region is compatible with the p/pi ratio of an inclusive measurement, and is much larger than the p/pi ratio in the jet peak. The p/pi ratio in the jet peak is compatible with a PYTHIA reference, in which fragmentation in the vacuum is the dominant mechanism of particle production.

References in corpus (6)

• First Results from Pb+Pb collisions at the LHC
• Coalescence Models For Hadron Formation From Quark Gluon Plasma
• Measurement of jet fragmentation into charged particles in pp and PbPb collisions at sqrt(s[NN]) = 2.76 TeV
• Jet hadrochemistry as a characteristics of jet quenching
• Hadron Correlations Measured with ALICE
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Cited by in corpus (9)

• Performance of the ALICE Experiment at the CERN LHC
• Review of Jet Measurements in Heavy Ion Collisions
• Mid-rapidity charged hadron transverse spherocity in pp collisions simulated with Pythia
• Revealing the source of the radial flow patterns in proton--proton collisions using hard probes
• Probing color reconnection with underlying event observables at the LHC energies
• An overview of experimental results from ultra-relativistic heavy-ion collisions at the CERN LHC: hard probes
• Particle production and flow-like effects in small systems
• Hadron Correlations Measured with ALICE
• Correlations and flavors in jets in ALICE