Two-particle Bose-Einstein correlations and their Lévy parameters in PbPb collisions at √sNN = 5.02 TeV
Abstract
Two-particle Bose–Einstein momentum correlation functions are studied for charged-hadron pairs in lead-lead collisions at a center-of-mass energy per nucleon pair of √sNN = 5.02 TeV. The data sample, containing 4.27 × 10⁹ minimum bias events corresponding to an integrated luminosity of 0.607 nb⁻¹, was collected by the CMS experiment in 2018. The experimental results are discussed in terms of a Lévy-type source distribution. The parameters of this distribution are extracted as functions of particle pair average transverse mass and collision centrality. These parameters include the Lévy index or shape parameter α, the Lévy scale parameter R, and the correlation strength parameter λ. The source shape, characterized by α, is found to be neither Cauchy nor Gaussian, implying the need for a full Lévy analysis. Similarly to what was previously found for systems characterized by Gaussian source radii, a hydrodynamical scaling is observed for the Lévy R parameter. The λ parameter is studied in terms of the core-halo model. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000666062Publication status
publishedExternal links
Journal / series
Physical Review CVolume
Pages / Article No.
Publisher
American Physical SocietySubject
Particle correlations & fluctuations; Relativistic heavy-ion collisionsFunding
758316 - Majorana neutrino discovery strategy with CMS (EC)
More
Show all metadata