2012/07/31 by M. Veldhoen, Misha Veldhoen · 1 citation
Chemistry · Physics and Astronomy · #Analytical Chemistry (journal) #Chemistry #High-Energy Particle Collisions Research #Jet (fluid) #Nuclear physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Thermodynamics #nucl-ex
paper · pdf · doi:10.1016/j.nuclphysa.2012.12.103
arxiv created 2012/10/08 · openalex publication_date 2013/07/24 · openalex created_date 2016/06/24 · arxiv updated 2019/08/21 · openalex updated_date 2026/08/05
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 / π ratio in the transverse momentum range 2.0 < p T , a s s o c < 4.0 GeV/c , associated with a charged trigger particle of 5.0 < p T , t r i g < 10.0 GeV/c , in 0–10% central Pb–Pb collisions at s N N = 2.76 TeV . The ratio is measured in the jet peak and in a region at large Δ η 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 / π ratio in the bulk region is compatible with the p / π ratio of an inclusive measurement, and is much larger than the p / π ratio in the jet peak. The p / π ratio in the jet peak is compatible with a PYTHIA reference, in which fragmentation in the vacuum is the dominant mechanism of particle production.