Suppression of Λ (1520) resonance production in central Pb-Pb collisions at √sNN = 2.76 TeV
Visualizar/abrir
Data
2019Autor
Tipo
Abstract
The production yield of the (1520) baryon resonance is measured at midrapidity in Pb-Pb collisions at √ sNN = 2.76 TeV with the ALICE detector at the Large Hadron Collider (LHC). The measurement is performed in the (1520) → pK− (and charge conjugate) hadronic decay channel as a function of the transverse momentum (pT) and collision centrality. The ratio of the pT-integrated production of (1520) baryons relative to baryons in central collisions is suppressed by about a factor of 2 with respect t ...
The production yield of the (1520) baryon resonance is measured at midrapidity in Pb-Pb collisions at √ sNN = 2.76 TeV with the ALICE detector at the Large Hadron Collider (LHC). The measurement is performed in the (1520) → pK− (and charge conjugate) hadronic decay channel as a function of the transverse momentum (pT) and collision centrality. The ratio of the pT-integrated production of (1520) baryons relative to baryons in central collisions is suppressed by about a factor of 2 with respect to peripheral collisions. This is the first observation of the suppression of a baryonic resonance at the LHC and the first 3σ evidence of (1520) suppression within a single collision system. The measured (1520)/ ratio in central collisions is smaller than the value predicted by the statistical hadronization model calculations. The shape of the measured pT distribution and the centrality dependence of the suppression are reproduced by the EPOS3 Monte Carlo event generator. The measurement adds further support to the formation of a dense hadronic phase in the final stages of the evolution of the fireball created in heavy-ion collisions, lasting long enough to cause a significant reduction in the observable yield of short-lived resonances. ...
Contido em
Physical review. C, Nuclear physics. Melville. Vol. 99, no. 2 (Feb. 2019), 024905, 12 p.
Origem
Estrangeiro
Coleções
-
Artigos de Periódicos (39774)Ciências Exatas e da Terra (6068)
Este item está licenciado na Creative Commons License