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Multi-strange baryon production in p-Pb collisions at √sNN=5.02 TeV
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Multi-strange baryon production in p-Pb collisions at √sNN=5.02 TeV

J. Adam, D. Adamová, M.M. Aggarwal, G. Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, S. Ahmad, S.U. Ahn, S. Aiola, …
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 卷.758, 頁碼.389-401
07/2016
DOI: https://doi.org/10.1016/j.physletb.2016.05.027

摘要

Nuclear and High Energy Physics
The multi-strange baryon yields in Pb-Pb collisions have been shown to exhibit an enhancement relative to pp reactions. In this work, Ξ and Ω production rates have been measured with the ALICE experiment as a function of transverse momentum, p <sub>T</sub> , in p-Pb collisions at a centre-of-mass energy of s <sub>NN</sub> =5.02 TeV. The results cover the kinematic ranges 0.6 GeV/c<p <sub>T</sub> <7.2 GeV/c and 0.8 GeV/c<p <sub>T</sub> <5 GeV/c, for Ξ and Ω respectively, in the common rapidity interval −0.5<y <sub>CMS</sub> <0. Multi-strange baryons have been identified by reconstructing their weak decays into charged particles. The p <sub>T</sub> 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 <sub>T</sub> 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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