Pseudorapidity distributions of charged hadrons in lead-lead collisions at √sNN= 5.36 TeV

Boos, E.E.; Demiyanov, A.; Ershov, A.A.; A, G.; Khein, L.; Kodolova, O.L.; Korotkikh, V.L.; Obraztsov, S.V.; Petrushanko, S.V.; Savrin, V.I.; Snigirev, A.M.; Vardanyan, I.; CMS, C.

Авторы: Boos E.E., Demiyanov A., Ershov A.A., A Gribushin, Khein L., Kodolova O.L., Korotkikh V.L., Obraztsov S.V., Petrushanko S.V., Savrin V.I., Snigirev A.M., Vardanyan I., CMS Collaboration
Журнал: Physics Letters B
Том: 861
Год издания: 2025
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 139279
DOI: 10.1016/j.physletb.2025.139279
Аннотация: The pseudorapidity (𝜂) distributions of charged hadrons are measured using data collected at the highest ever nucleon-nucleon center-of-mass energy of √𝑠NN = 5.36 TeV for collisions of lead-lead ions. The data were recorded by the CMS experiment at the LHC in 2022 and correspond to an integrated luminosity of 0.30 ± 0.03 μb−1. Using the CMS silicon pixel detector, the yields of primary charged hadrons produced in the range |𝜂| < 2.6 are reported. The evolution of the midrapidity particle density as a function of collision centrality is also reported. In the 5% most central collisions, the charged-hadron 𝜂 density in the range |𝜂| < 0.5 is found to be 2032 ± 91 (syst), with negligible statistical uncertainty. This result is consistent with an extrapolation from nucleus-nucleus collision data at lower center-of-mass energies. Comparisons are made to various Monte Carlo event generators and to previous measurements of lead-lead and xenon-xenon collisions at similar collision energies. These new data detail the dependence of particle production on the collision energy, initial collision geometry, and the size of the colliding nuclei.
Добавил в систему: Петрушанко Сергей Владимирович

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