Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Heavy Ion Collisions and QCD Phases 2

HK 15.3: Talk

Monday, March 23, 2015, 17:45–18:00, T/HS1

Dynamical K/π, p/π, and K/p fluctuations in Pb-Pb collisions with ALICE — •Mesut Arslandok for the ALICE collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt

The study of event-by-event fluctuations of identified hadrons may reveal the degrees of freedom of the strongly interacting matter created in heavy-ion collisions and reflect the underlying dynamics of the system. The observable ν_dyn, which is given in terms of the moments of identified-particle multiplicity distributions, is used to quantify the magnitude of the dynamical fluctuations in event-by-event measurements of given particle ratios. The ALICE detector at the LHC is well suited for the study of ν_dyn, due to its excellent particle identification (PID) capabilities.

Particle identification that is based on the measurement of the specific ionisation energy loss dE/dx works well on a statistical basis, however, suffers from ambiguities when applied on the event-by-event level. A novel experimental technique called the "Identity Method" was recently proposed to overcome such limitations. The method follows a probabilistic approach using the inclusive dE/dx distributions measured in the ALICE TPC, and determines the moments of the multiplicity distributions by an unfolding procedure. In this contribution, dynamical K/π, p/π, and K/p fluctuation analysis that applies the Identity Method to Pb-Pb data from ALICE will be presented.