Multi-strange baryon production in pPb collisions at
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The multi-strange baryon yields in Pbsingle bondhImg 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, hmlsrc">hImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316301745&_mathId=si2.gif&_user=111111111&_pii=S0370269316301745&_rdoc=1&_issn=03702693&md5=16a421cafa0e2a0e956387184f993c7f" title="Click to view the MathML source">pThContainer hidden">hCode">h altimg="si2.gif" overflow="scroll">phvariant="normal">Th>, in psingle bondhImg imgLazyJSB">Pb collisions at a centre-of-mass energy of hmlsrc">he MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316301745&_mathId=si1.gif&_user=111111111&_pii=S0370269316301745&_rdoc=1&_issn=03702693&md5=22ecafd7b47a44afcb612cc29dfc064b">height="15" width="105" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0370269316301745-si1.gif">hContainer hidden">hCode">h altimg="si1.gif" overflow="scroll">shvariant="normal">NN=5.02 TeVh>. The results cover the kinematic ranges hmlsrc">hImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316301745&_mathId=si4.gif&_user=111111111&_pii=S0370269316301745&_rdoc=1&_issn=03702693&md5=4d11b492fbd8d1bc70d8e60f5649216e" title="Click to view the MathML source">0.6 GeV/c<pT<7.2 GeV/chContainer hidden">hCode">h altimg="si4.gif" overflow="scroll">0.6 GeVhy="false">/c<phvariant="normal">T<7.2 GeVhy="false">/ch> and hmlsrc">hImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316301745&_mathId=si5.gif&_user=111111111&_pii=S0370269316301745&_rdoc=1&_issn=03702693&md5=b5324ea13fd912edfc17796789fe720f" title="Click to view the MathML source">0.8 GeV/c<pT<5 GeV/chContainer hidden">hCode">h altimg="si5.gif" overflow="scroll">0.8 GeVhy="false">/c<phvariant="normal">T<5 GeVhy="false">/ch>, for Ξ and Ω respectively, in the common rapidity interval hmlsrc">hImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316301745&_mathId=si6.gif&_user=111111111&_pii=S0370269316301745&_rdoc=1&_issn=03702693&md5=1ee0a5fb2233cf0f6317de667943088c" title="Click to view the MathML source">−0.5<yCMS<0hContainer hidden">hCode">h altimg="si6.gif" overflow="scroll">0.5<yhvariant="normal">CMS<0h>. Multi-strange baryons have been identified by reconstructing their weak decays into charged particles. The hmlsrc">hImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316301745&_mathId=si2.gif&_user=111111111&_pii=S0370269316301745&_rdoc=1&_issn=03702693&md5=16a421cafa0e2a0e956387184f993c7f" title="Click to view the MathML source">pThContainer hidden">hCode">h altimg="si2.gif" overflow="scroll">phvariant="normal">Th> spectra are analysed as a function of event charged-particle multiplicity, which in psingle bondhImg imgLazyJSB">Pb collisions ranges over one order of magnitude and lies between those observed in pp and Pbsingle bondhImg imgLazyJSB">Pb collisions. The measured hmlsrc">hImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269316301745&_mathId=si2.gif&_user=111111111&_pii=S0370269316301745&_rdoc=1&_issn=03702693&md5=16a421cafa0e2a0e956387184f993c7f" title="Click to view the MathML source">pThContainer hidden">hCode">h altimg="si2.gif" overflow="scroll">phvariant="normal">Th> 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 bondhImg imgLazyJSB">Pb collisions. The yield of hyperons relative to charged pions is studied and compared with results from pp and Pbsingle bondhImg imgLazyJSB">Pb collisions. A continuous increase in the yield ratios as a function of multiplicity is observed in psingle bondhImg imgLazyJSB">Pb data, the values of which range from those measured in minimum bias pp to the ones in Pbsingle bondhImg 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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