Naslov
Measurement of ψ (2S) production as a function of charged-particle pseudorapidity density in pp collisions at √s = 13 TeV and p–Pb collisions at √sNN = 8.16 TeV with ALICE at the LHC

Autori
Acharya, S. ; … ; Erhardt, Filip ; … ; Gotovac, Sven ; …. ; Jercic, Marko ; … ; Karatovic, David ; … ; Loncar, Petra ; … ; Mudnic, Eugen ; … ; Planinic, Mirko ; … ; Poljak, Nikola ; … ; Vickovic, Linda ; … ; Zurlo, N.

Kolaboracija
ALICE Collaboration

Izvornik
Journal of High Energy Physics (1029-8479) 2023 (2023), 6; 147, 29

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Jets and Jet Substructure ; Properties of Hadrons ; psi(3685): production ; charged particle: rapidity ; rapidity: density ; p p: scattering ; p nucleus: scattering ; charged particle: multiplicity: measured ; charmonium: production ; multiplicity: dependence ; dimuon: decay ; ALICE ; CERN LHC Coll ; experimental results ; 8160: 13000 GeV-cms/nucleon

Sažetak
Production of inclusive charmonia in pp collisions at center-of-mass energy of √s = 13 TeV and p–Pb collisions at center-of-mass energy per nucleon pair of √sNN = 8.16 TeV is studied as a function of charged-particle pseudorapidity density with ALICE. Ground and excited charmonium states (J/ψ, ψ(2S)) are measured from their dimuon decays in the interval of rapidity in the center-of-mass frame 2.5 < ycms < 4.0 for pp collisions, and 2.03 < ycms < 3.53 and −4.46 < ycms < −2.96 for p–Pb collisions. The charged-particle pseudorapidity density is measured around midrapidity (|η| < 1.0). In pp collisions, the measured charged-particle multiplicity extends to about six times the average value, while in p-Pb collisions at forward (backward) rapidity a multiplicity corresponding to about three (four) times the average is reached. The ψ(2S) yield increases with the charged-particle pseudorapidity density. The ratio of ψ(2S) over J/ψ yield does not show a significant multiplicity dependence in either colliding system, suggesting a similar behavior of J/ψ and ψ(2S) yields with respect to charged-particle pseudorapidity density. Results for the ψ(2S) yield and its ratio with respect to J/ψ agree with available model calculations.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA