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 √s_NN = 8.16 TeV with ALICE at the LHC · arXivDesk
2204.10253Apr 21, 202225 pages, 6 captioned figures, 2 tables, authors from page 20, published version, figures at http://alice-publications.web.cern.ch/node/7849
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
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
Nearby in the stack
= 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