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arXiv · 2307.16633

Quantum local-equilibrium state with fixed multiplicity constraint and Bose-Einstein momentum correlations

M. D. Adzhymambetov·S. V. Akkelin·Yu. M. Sinyukov
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Abstract

The one- and two-boson momentum spectra are derived in the quantum local-equilibrium canonical ensemble of noninteracting bosons with a fixed particle number constraint. We define the canonical ensemble as a subensemble of events associated with the grand-canonical ensemble. Applying simple hydro-inspired parametrization with parameter values that correspond roughly to the values at the system's breakup in $p+p$ collisions at the LHC energies, we compare our findings with the treatment which is based on the grand-canonical ensembles where mean particle numbers coincide with fixed particle numbers in the canonical ensembles. We observe a significantly greater sensitivity of the two-particle momentum correlation functions to fixed multiplicity constraint compared to one-particle momentum spectra. The results of our analysis may be useful for interpretation of multiplicity-dependent measurements of $p+p$ collision events.

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M. D. Adzhymambetov, S. V. Akkelin, Yu. M. Sinyukov. 2023-07-31. Quantum local-equilibrium state with fixed multiplicity constraint and Bose-Einstein momentum correlations. https://doi.org/10.1103/physrevd.108.096030

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