Relative particle yield fluctuations in Pb-Pb collisions at √sNN = 2.76 TeV

Research output: Contribution to journalArticlepeer-review

Colleges, School and Institutes

Abstract

First results on K / π, p / π and K/p fluctuations are obtained with the ALICE detector at the CERN LHC as a function of centrality in Pb--Pb collisions at sNN=2.76TeV. The observable ν dyn , which is defined in terms of the moments of particle multiplicity distributions, is used to quantify the magnitude of dynamical fluctuations of relative particle yields and also provides insight into the correlation between particle pairs. This study is based on a novel experimental technique, called the Identity Method, which allows one to measure the moments of multiplicity distributions in case of incomplete particle identification. The results for p / π show a change of sign in ν dyn from positive to negative towards more peripheral collisions. For central collisions, the results follow the smooth trend of the data at lower energies and ν dyn exhibits a change in sign for p / π and K/p.

Details

Original languageEnglish
Article number236
JournalEur. Phys. J. C
Volume79
Issue number3
Publication statusPublished - 14 Mar 2019