Neutral to charged kaon yield fluctuations in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76TeV

Abstract

We present the first measurement of event-by-event fluctuations in the kaon sector in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 2.76 TeV with the ALICE detector at the LHC. The robust fluctuation correlator ${\nu }_{\mathrm{dyn}}$ is used to evaluate the magnitude of fluctuations of the relative yields of neutral and charged kaons, as well as the relative yields of charged kaons, as a function of collision centrality and selected kinematic ranges. While the correlator ${\nu }_{\mathrm{dyn}}[{\mathrm{K}}^{+},{\mathrm{K}}^{-}]$ exhibits a scaling approximately in inverse proportion of the charged particle multiplicity, ${\nu }_{\mathrm{dyn}}[{\mathrm{K}}_{\mathrm{S}}^0,{\mathrm{K}}^{\pm }]$ features a significant deviation from such scaling. Within uncertainties, the value of ${\nu }_{\mathrm{dyn}}[{\mathrm{K}}_{\mathrm{S}}^0,{\mathrm{K}}^{\pm }]$ is independent of the selected transverse momentum interval, while it exhibits a pseudorapidity dependence. The results are compared with HIJING, AMPT and EPOS-LHC predictions, and are further discussed in the context of the possible production of disoriented chiral condensates in central Pb-Pb collisions.

arXiv comment20 pages, 5 captioned figures, authors from page 15, published version, figures at http://alice-publications.web.cern.ch/node/7623

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