Measurement of (anti)alpha production in central Pb-Pb collisions at √sNN=5.02 TeV

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In this letter, measurements of (anti)alpha production in central (0-10%) Pb-Pb collisions at a center-of-mass energy per nucleon-nucleon pair of root s(NN) = 5.02 TeV are presented, including the first measurement of an antialpha transverse-momentum spectrum. Owing to its large mass, the production of (anti)alpha is expected to be sensitive to different particle production models. The production yields and transverse-momentum spectra of nuclei are of particular interest because they provide a stringent test of these models. The averaged antialpha and alpha spectrum is compared to the spectra of lighter particles, by including it into a common blast-wave fit capturing the hydrodynamic-like flow of all particles. This fit is indicating that the (anti)alpha also participates in the collective expansion of the medium created in the collision. A blast-wave fit including only protons, (anti)alpha, and other light nuclei results in a similar flow velocity as the fit that includes all particles. A similar flow velocity, but a significantly larger kinetic freeze-out temperature is obtained when only protons and light nuclei are included in the fit. The coalescence parameter B-4 is well described by calculations from a statistical hadronization model but significantly underestimated by calculations assuming nucleus formation via coalescence of nucleons. Similarly, the (anti)alpha-to-proton ratio is well described by the statistical hadronization model. On the other hand, coalescence calculations including approaches with different implementations of the (anti)alpha substructure tend to underestimate the data.

키워드

LIGHT-NUCLEI PRODUCTIONDEUTERON PRODUCTIONPP COLLISIONS(ANTI-)DEUTERON PRODUCTIONMULTIPLICITY DEPENDENCEANTINUCLEI PRODUCTIONPARTICLE-PRODUCTIONPB+PB COLLISIONSCOALESCENCEMATTER
제목
Measurement of (anti)alpha production in central Pb-Pb collisions at √sNN=5.02 TeV
저자
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DOI
10.1016/j.physletb.2024.138943
발행일
2024-11
유형
Article
저널명
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
858