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Investigation into the event-activity dependence of ϒ(nS) relative production in proton-proton collisions at $\sqrt{s}$ = 7 TeV

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  • معلومة اضافية
    • بيانات النشر:
      Scuola Internazionale Superiore di Studi Avanzati
    • الموضوع:
      2021
    • Collection:
      KITopen (Karlsruhe Institute of Technologie)
    • نبذة مختصرة :
      The ratios of the production cross sections between the excited ϒ(2S) and ϒ(3S) mesons and the ϒ(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 $\sqrt{s}$ = 7 TeV, 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 pμμ¦T. For ϒ(nS) mesons with pμμ¦T > 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 ϒ(nS) direction. The ratios are found to be multiplicity independent for jet-like events. The mean pμμ¦T values for the ϒ(nS) states as a function of particle multiplicity are also measured and found to grow more steeply as their mass increases.
    • File Description:
      application/pdf
    • Relation:
      info:eu-repo/semantics/altIdentifier/wos/000585126400001; info:eu-repo/semantics/altIdentifier/issn/1029-8479; https://publikationen.bibliothek.kit.edu/1000129085; https://publikationen.bibliothek.kit.edu/1000129085/100759300; https://doi.org/10.5445/IR/1000129085
    • الرقم المعرف:
      10.5445/IR/1000129085
    • Rights:
      https://creativecommons.org/licenses/by/4.0/deed.de ; info:eu-repo/semantics/openAccess
    • الرقم المعرف:
      edsbas.F256C9E9