Abstract
Precise determination of the moments of multiplicity distributions of identified particles could be challenging due to the misidentification in detectors. The so-called Identity Method allows one to solve this problem. In this contribution, performance of the Identity Method was tested on the A – A events simulated in the conditions of the MPD experiment at NICA. With this method, moments within a single kinematic window as well as coefficients of forward-backward pseudorapidity correlations are extracted.
Highlights
Collisions of relativistic nuclei can produce matter at extremely high temperatures and densities.Studies of the transition between the hadronic and partonic phases of this matter are being performed, in particular, with various combinations of moments of multiplicity distributions, for example, by studying event-by-event fluctuations of net-proton number
In Identity Method (IM), “proxies” for particle multiplicities Wj in each event are constructed as Wj =
The first ( Ni, i is a particle type), second ( Ni2 ), and cross-moments ( NiNj ) of identified particle yields were recovered with the IM
Summary
Collisions of relativistic nuclei can produce matter at extremely high temperatures and densities. Studies of the transition between the hadronic and partonic phases of this matter are being performed, in particular, with various combinations of moments of multiplicity distributions, for example, by studying event-by-event fluctuations of net-proton number This requires identification of different particle species (pions, kaons, protons, electrons). Tracks were required to have minimum 30 clusters in TPC with χ2 per cluster less than 5, and the distance of closest approach to the primary vertex along z-axis less than 2 cm This selection allows one to reduce contamination by secondary particles from weak decays and detector material, keeping the efficiency at 80-90% level. Fitted functions in all momentum slices and a ROOT tree containing dE/dx and other eventand track-level information were transferred to the IM machinery
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