Multi-strange baryon production in p-Pb collisions at root(NN)-N-S=5.02 TeV
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M. B. and Zinovjev, G. and Zyzak, M. and ALICE Collaboration... Show more Show less
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Abstract
The multi-strange baryon yields in Pb-Pb collisions have been shown to
exhibit an enhancement relative to pp reactions. In this work, Xi and
Omega production rates have been measured with the ALICE experiment as a
function of transverse momentum, p(T), in p-Pb collisions at a
centre-of-mass energy of,/sNN = 5.02 TeV. The results cover the
kinematic ranges 0.6 GeV/c < p(T) < 7.2 GeV/c and 0.8 GeV/c < p(T) < 5
GeV/c, for E and S-2 respectively, in the common rapidity interval 0.5 <
ycms < 0. Multii -strange baryons have been identified by reconstructing
their weak decays into charged particles. The p(T) spectra are analysed
as a function of event charged -particle multiplicity, which in p-Pb
collisions ranges over one order of magnitude and lies between those
observed in pp and Pb-Pb collisions. The measured p -r distributions are
compared to the expectations from a Blast -Wave model. The parameters
which describe the production of lighter hadron species also describe
the hyperon spectra in high multiplicity p-Pb collisions. The yield of
hyperons relative to charged pions is studied and compared with results
from pp and Pb-Pb collisions. A continuous increase in the yield ratios
as a function of multiplicity is observed in p-Pb data, the values of
which range from those measured in minimum bias pp to the ones in Pb-Pb
collisions. A statistical model qualitatively describes this
multiplicity dependence using a canonical suppression mechanism, in
which the small volume causes a relative reduction of hadron production
dependent on the strangeness content of the hyperon. (C) 2016 The
Author(s). Published by Elsevier B.V. This is an open access article
under the CC BY license (http/creativecommons,org/licenses/by/4.0).
Funded by SCOAP(3).... Show more Show less