Author: Пользователь Windows

Specialization: 010700/17 Theoretical and mathematical physics
Program: 28 Elementary particles interaction theory and quantum field theory
Head program:  prof. M. A. Braun
Supervisor: Prof. Dr. V.V.Vechernin
Reviewer: the Head of Laboratory of Ultra-High Energy Physics G.A.Feofilov

The Multiplicity fluctuations and determination of centrality classes in nucleus-nucleus interactions at high energies.
T.A.Drozhzhova

This work is connected with two heavy-ions experiments in CERN (NA61/SHINE at SPS and ALICE at LHC) and devoted to the study of the Multiplicity fluctuations and determination of centrality classes in nucleus-nucleus interactions at high energies.  
In the first part ALICE reconstructed MC data generated by the HIJING event-generator was analyzed with the goal to test and compare different hypotheses for the centrality class definition. As a result, for all values of the impact parameter including the central and peripheral collisions the value of centrality selection bins was determined in percentage wise of widths in the minimum bias cross section where the multiplicity distributions are good Gaussians and the fluctuations of the observable values are minimized.
In the second part the Monte-Carlo geometrical model generator was created. The background fluctuation effect to the multiplicity fluctuations of charged particles produced in AA collisions at SPS energy was studied using this generator.

The list of the publications

1. T.A.Drozhzhova “Fluctuations of a number of wounded nucleons and binary NN collisions in nucleus-nucleus interactions in a fixed target experiment”. Proceedings of International Student Conference “Science and progress”, Saint-Petersburg 2010