Tagging of eta' decay products to analyze chiral restoration

Details Tagging of eta' decay products to analyze chiral restoration Tagging of eta' decay products to analyze chiral restoration

2011-01-06

arxiv.org/abs/1101.1276v2

Eur.Phys.J.A47:76,2011

Physics

Nuclear Physics

Nuclear Theory

5 pages, 5 figures. This work was supported by the OTKA grant NK73143 and M. Csanad's Bolyai scholarship

Scientific paper

10.1140/epja/i2011-11076-5

In case of chiral U_A(1) symmetry restoration the mass of the eta' boson (the ninth, would-be Goldstone boson) is decreased, thus its production cross section is heavily enhanced. The eta' decays (through one of its decay channels) into five pions. These pions will not be correlated in terms of Bose-Einsten correlations, thus the production enhancement changes the strength of two-pion correlation functions at low momentum. Preliminary results strongly support the mass decrease of the eta' boson. In this paper we propose a method to select pions coming from eta' decays. We investigate the efficiency of the proposed kinematical cut in several collision systems and energies with several simulators. We prove that our method can be used in all investigeted collision systems.

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