Strangeness production as a function of charged particle multiplicity in proton-proton collisions

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• 作者：Livio Bianchi ; for the ALICE Collaboration
• 关键词：Strangeness enhancement ; QGP in small systems ; Multiplicity dependence
• 刊名：Nuclear Physics A
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：956
• 期：Complete
• 页码：777-780
• 全文大小：370 K

文摘

Recent measurements performed in high-multiplicity proton-proton (pp) and proton-lead (p-Pb) collisions have shown features that are reminiscent of those observed in lead-lead (Pb-Pb) collisions. These observations warrant a comprehensive measurement of the production of identified particles. We report on the production of $K_S^0$, Λ, $\bar{\mathrm{\Lambda }}$, Ξ^±${\mathrm{\Xi }}^{\pm }$ and Ω^±${\mathrm{\Omega }}^{\pm }$ at mid-rapidity measured as a function of multiplicity in pp collisions at $\sqrt{s}=7\text{TeV}$ with the ALICE experiment. Spectral shapes studied both for individual particles and via particle ratios such as ($\mathrm{\Lambda }/K_S^0$) as a function of p_T exhibit an evolution with event multiplicity and the production rates of hyperons are observed to increase more strongly than those of non-strange hadrons. These phenomena are qualitatively similar to the ones observed in p-Pb and Pb-Pb collisions.