Multi-strange baryon production in pPb collisions at
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The multi-strange baryon yields in Pbder="0" alt="single bond" data-inlimg="/entities/sbnd" src="/sd/grey_pxl.gif" class="glyphImg imgLazyJSB">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, pTden">de">pT, in pder="0" alt="single bond" data-inlimg="/entities/sbnd" src="/sd/grey_pxl.gif" class="glyphImg imgLazyJSB">Pb collisions at a centre-of-mass energy of View the MathML sourceden">de">sNN=5.02 TeV. The results cover the kinematic ranges 0.6 GeV/c<pT<7.2 GeV/cden">de">0.6 GeV/c<pT<7.2 GeV/c and 0.8 GeV/c<pT<5 GeV/cden">de">0.8 GeV/c<pT<5 GeV/c, for Ξ and Ω respectively, in the common rapidity interval de667943088c" title="Click to view the MathML source">−0.5<yCMS<0den">de">0.5<yCMS<0. Multi-strange baryons have been identified by reconstructing their weak decays into charged particles. The pTden">de">pT spectra are analysed as a function of event charged-particle multiplicity, which in pder="0" alt="single bond" data-inlimg="/entities/sbnd" src="/sd/grey_pxl.gif" class="glyphImg imgLazyJSB">Pb collisions ranges over one order of magnitude and lies between those observed in pp and Pbder="0" alt="single bond" data-inlimg="/entities/sbnd" src="/sd/grey_pxl.gif" class="glyphImg imgLazyJSB">Pb collisions. The measured pTden">de">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 pder="0" alt="single bond" data-inlimg="/entities/sbnd" src="/sd/grey_pxl.gif" class="glyphImg imgLazyJSB">Pb collisions. The yield of hyperons relative to charged pions is studied and compared with results from pp and Pbder="0" alt="single bond" data-inlimg="/entities/sbnd" src="/sd/grey_pxl.gif" class="glyphImg imgLazyJSB">Pb collisions. A continuous increase in the yield ratios as a function of multiplicity is observed in pder="0" alt="single bond" data-inlimg="/entities/sbnd" src="/sd/grey_pxl.gif" class="glyphImg imgLazyJSB">Pb data, the values of which range from those measured in minimum bias pp to the ones in Pbder="0" alt="single bond" data-inlimg="/entities/sbnd" src="/sd/grey_pxl.gif" class="glyphImg imgLazyJSB">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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