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Tagging of \( \eta{^\prime}\) decay products to analyze chiral restoration

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Abstract.

In case of chiral U A(1) symmetry restoration the mass of the \( \eta{^\prime}\) boson (the ninth, would-be Goldstone boson) is decreased, thus its production cross-section is heavily enhanced. The \( \eta{^\prime}\) decays (through one of its decay channels) into five low-momentum pions. These pions will not contribute to measured Bose-Einstein correlations, thus the production enhancement changes the strength of two-pion correlation functions at low momentum. Preliminary results on Bose-Einstein correlation functions support the mass decrease of the \( \eta{^\prime}\) boson. In this paper we propose a method to select pions originating from \( \eta{^\prime}\) 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 investigated collision systems.

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Authors and Affiliations

  1. Department of Atomic Physics, Eötvös University, Pázmány Péter s. 1/A, H-1117, Budapest, Hungary

    M. Csanád & M. Kõfaragó

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  1. M. Csanád
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  2. M. Kõfaragó
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Communicated by M. Anselmino

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Csanád, M., Kõfaragó, M. Tagging of \( \eta{^\prime}\) decay products to analyze chiral restoration. Eur. Phys. J. A 47, 76 (2011). https://doi.org/10.1140/epja/i2011-11076-5

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  • DOI: https://doi.org/10.1140/epja/i2011-11076-5

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