Sumit Basu
Postdoctoral Researcher
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
Author
Summary, in English
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 < y cms < 4.0 for pp collisions, and 2.03 < y cms < 3.53 and −4.46 < y cms < −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. [Figure not available: see fulltext.]. © 2023, The Author(s).
Department/s
- Particle and nuclear physics
Publishing year
2023
Language
English
Publication/Series
Journal of High Energy Physics
Volume
2023
Issue
6
Document type
Journal article
Publisher
Springer
Topic
- Subatomic Physics
Keywords
- Jets and Jet Substructure
- Properties of Hadrons
Status
Published
ISBN/ISSN/Other
- ISSN: 1029-8479