부산대학교 도서관

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 ratio in the transverse momentum range , associated with a charged trigger particle of , in 0–10% central Pb–Pb collisions at . The ratio is measured in the jet peak and in a region at large Δη 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 ratio in the bulk region is compatible with the ratio of an inclusive measurement, and is much larger than the ratio in the jet peak. The ratio in the jet peak is compatible with a PYTHIA reference, in which fragmentation in the vacuum is the dominant mechanism of particle production. [Copyright &y& Elsevier]