Multiplicity dependence of light flavour hadrons in small systems with the ALICE experiment

Workshop for young scientists on the physics of ultrarelativistic nucleus-nucleus collisions 2016

Jacazio, Nicolò^1

Department of Physics and Astronomy - Alma Mater Studiorum, Università di Bologna, Via Irnerio, 46, Bologna

40126, Italy^1

关键词: Charged particle multiplicities;    Collective behaviour;    Collision systems;    High multiplicity;    Large Hadron Collider;    Particle identifications;    Particle production;    Transverse momenta;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/832/1/012019/pdf
DOI  :  10.1088/1742-6596/832/1/012019

来源: IOP

【 摘 要 】

The large statistics of data collected at the high energies reached at the Large Hadron Collider have provided unprecedented opportunities to probe in more detail the mechanisms of particle production in small collision systems such as proton-proton (pp) and proton-lead (p-Pb) collisions. It is particularly interesting to perform such studies in high-multiplicity events, where, in the last years, features where found that are reminiscent of phenomena interpreted as signs of collective behaviour in lead-lead (Pb-Pb) collisions. These observations justify a comprehensive study of the production of identified particles to further investigate the dynamics in small collision systems. The ALICE detector, thanks to its excellent particle identification capabilities, allows the measurement of identified particles over a wide range of transverse momentum (pT). In these proceedings we report on the pTdistributions of π, K, p, , K∗, Λ, Ξ and Ω measured as function of the charged-particle multiplicity density in pp collisions at = 7 TeV. We further report on the study of particle ratios in comparison to Monte Carlo models and in different collision systems. In particular, the production of hadrons containing strange quarks is also discussed as a function of the event multiplicity.