from 28 November 2016 to 2 December 2016
Hotel Rincón del Arco
Mexico/General timezone
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Hotel Rincón del Arco - Salón Giralda

Multiplicity dependence of identified particle production in proton-proton and proton-lead collisions measured with ALICE


  • Dr. Stefania BUFALINO

Primary authors

Abstract content

Recent measurements performed in high-multiplicity proton-proton (pp) and proton-lead (p-Pb) collisions have revealed features that are reminiscent of lead-lead (Pb-Pb) phenomenology. The investigation of such phenomena requires a systematic study of light-flavor particle production as a function of charged particle multiplicity.

ALICE has unique PID capabilities at mid-rapidity and excellent $p_{\rm{T}}$ coverage among the LHC experiments. Particle identification is performed using several techniques namely exploiting the measurement of the specific ionization energy loss in the ITS and TPC, the time of flight measured with the TOF detector, the Cherenkov radiation measured in the HMPID.

The combination of these techniques allows for the measurement of $p_{\rm{T}}$ distributions, integrated yields $\rm{d}\it{N}/\rm{d}\it{y}$ and mean transverse momenta $\langle p_{\rm{T}} \rangle $ of identified light-flavor hadrons. In this contribution the results on $\pi$, K, p, $K^{0}{S}$, $\Lambda$, $\Xi$, $\Omega$ and resonances as function of the multiplicity in pp collisions at $\sqrt{s}$ = 7 TeV and p-Pb collisions at $\sqrt{s{\rm{NN}}}$ = 5.02 TeV are presented along with a discussion of the baryon/meson ratio, Blast Wave fits and collectivity effects. In addition, the measurements are compared with the calculations of QCD-inspired Monte Carlo models to discuss the underlying physics.

I would like to underline that the International Advisory Board, in particular Peter Skands, asked explicitly for such a contribution.