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Multi-strange baryon production in pPb collisions at
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文摘
The multi-strange baryon yields in Pbsingle bondPb 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, fa0e2a0e956387184f993c7f" title="Click to view the MathML source">pT, in psingle bondPb collisions at a centre-of-mass energy of View the MathML source. 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 Ξ and Ω 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 fa0e2a0e956387184f993c7f" title="Click to view the MathML source">pT spectra are analysed as a function of event charged-particle multiplicity, which in psingle bondPb collisions ranges over one order of magnitude and lies between those observed in pp and Pbsingle bondPb collisions. The measured fa0e2a0e956387184f993c7f" title="Click to view the MathML source">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 psingle bondPb collisions. The yield of hyperons relative to charged pions is studied and compared with results from pp and Pbsingle bondPb collisions. A continuous increase in the yield ratios as a function of multiplicity is observed in psingle bondPb data, the values of which range from those measured in minimum bias pp to the ones in Pbsingle bondPb 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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