Abstract
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 pT distributions 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.
Highlights
High energy heavy-ion collisions, such as Pb–Pb collisions at the Large Hadron Collider, provide a unique way to study the deconfined state of matter known as Quark-Gluon Plasma (QGP)
A similar phenomenology to the Pb–Pb case has been observed for high energy pp and p–Pb collisions when selecting events with a higher number of charged particles produced with respect to the minimum-bias values
We report on the transverse momentum spectra√of π, K, p, KS0, K ∗, Λ, Ξ and Ω measured as a function of multiplicity in pp collisions at s = 7 TeV [8]
Summary
High energy heavy-ion collisions, such as Pb–Pb collisions at the Large Hadron Collider, provide a unique way to study the deconfined state of matter known as Quark-Gluon Plasma (QGP). The onset of this strongly interacting phase is accompanied by some peculiar signatures in the final state. In particular some clear analogies have been found for the three systems when comparing longrange and near-side angular correlations [2, 3, 4, 5] These observations motivate a comprehensive study of the identified particle production in order to investigate in more detail the origin of these features. High Momentum Particle IDentification (HMPID) detector identifies particles by measuring the angle of emission of Cherenkov light
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