Multi-strange baryon production in p-Pb collisions at √sNN = 5.02 TeV
ALICE Collaboration. (2016). Multi-strange baryon production in p-Pb collisions at √sNN = 5.02 TeV. Physics Letters B, 758, 389-401. https://doi.org/10.1016/j.physletb.2016.05.027
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Physics Letters BAuthors
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2016Copyright
© 2016 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license. Funded by SCOAP3.
The multi-strange baryon yields in Pb–Pb collisions have been shown to exhibit an enhancement
relative to pp reactions. In this work, and production rates have been measured with the ALICE
experiment as a function of transverse momentum, pT, 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 < pT < 7.2 GeV/c and 0.8 GeV/c <
pT < 5 GeV/c, for and respectively, in the common rapidity interval −0.5 < yCMS < 0. Multi-strange
baryons have been identified by reconstructing their weak decays into charged particles. The pT 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
pT 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.
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Except where otherwise noted, this item's license is described as © 2016 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license. Funded by SCOAP3.
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