Feb 5 – 11, 2017
Hyatt Regency Chicago
America/Chicago timezone

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

Feb 7, 2017, 9:50 AM
Regency B

Regency B


Vytautas Vislavicius (Lund University (SE))


The study of identified particle production as a function of the proton-proton (pp) collision energy and multiplicity
is a key tool for understanding similarities and differences between small and large interacting systems.
We report on the production of pions, kaons, protons, K$^{0}_{\rm S}$, $\Lambda$, $\Xi$, $\Omega$, K$^{*0}$ and $\phi$ measured in pp collisions for $\sqrt{s}$ ranging from 0.9 to 13 TeV.

The multiplicity dependence of identified particle spectra and yields is presented for $\sqrt{s}$ = 7 and 13 TeV and compared to results obtained in proton-lead (p-Pb) and lead-lead (Pb-Pb) collisions, unveiling remarkable and intriguing similarities among systems and energies.
The production rates of strange hadrons are observed to increase more than those of non-strange particles, showing an enhancement pattern with multiplicity which does not depend on the collision energy.
Even if the multiplicity dependence of spectral shapes can be qualitatively described by commonly-used Monte Carlo event generators, the evolution of integrated yield ratios is poorly described by these models. Finally, these results will also be compared to expectations from hydrodynamics.

Preferred Track QCD in small systems
Collaboration ALICE

Primary author

Vytautas Vislavicius (Lund University (SE))

Presentation materials