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https://hdl.handle.net/11147/10399
Title: | Investigation into the event-activity dependence of gamma(nS) relative production in proton-proton collisions at root s=7 TeV | Authors: | Karapınar, Güler CMS Collaboration |
Keywords: | B physics Hadron-Hadron scattering (experiments) Particle correlations Quarkonium |
Publisher: | Springer Verlag | Abstract: | The 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. | URI: | https://doi.org/10.1007/JHEP11(2020)001 https://hdl.handle.net/11147/10399 |
ISSN: | 1029-8479 |
Appears in Collections: | Rectorate / Rektörlük Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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