Yetkin, Elif Aslı2020-12-032020-12-032020-11-021029-8479https://hdl.handle.net/11411/2766https://doi.org/10.1007/JHEP11(2020)00139 pagesThe ratios of the production cross sections between the excited gamma(2S) and gamma(3S) mesons and the gamma(1S) ground state, detected via their decay into two muons, are studied as a function of the number of charged particles in the event. The data are from proton-proton collisions at root s = 7TeV, corresponding to an integrated luminosity of 4.8 fb(-1), collected with the CMS detector at the LHC. Evidence of a decrease in these ratios as a function of the particle multiplicity is observed, more pronounced at low transverse momentum p(T)(mu mu). For gamma(nS) mesons with p(T)(mu mu) > 7 GeV, where most of the data were collected, the correlation with multiplicity is studied as a function of the underlying event transverse sphericity and the number of particles in a cone around the gamma(nS) direction. The ratios are found to be multiplicity independent for jet-like events. The mean p(T)(mu mu) values for the gamma(nS) states as a function of particle multiplicity are also measured and found to grow more steeply as their mass increases.eninfo:eu-repo/semantics/openAccessHadron-Hadron scattering (experiments)Particle correlations and fluctuationsB physicsQuarkoniumArticle2-s2.0-8509639525910.1007/JHEP11(2020)001Q1WOS:000585126400001