Measurement of the relative prompt production rate of χc2 and χc1 in pp collisions at √s = 7 TeV


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Chatrchyan S., Khachatryan V., Sirunyan A., Tumasyan A., Adam W., Aguilo E., ...More

European Physical Journal C, vol.72, no.12, pp.1-22, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Letter
  • Volume: 72 Issue: 12
  • Publication Date: 2012
  • Doi Number: 10.1140/epjc/s10052-012-2251-3
  • Journal Name: European Physical Journal C
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1-22
  • Yıldız Technical University Affiliated: Yes

Abstract

A measurement is presented of the relative prompt production rate of χc2 and χc1 with 4.6 fb-1 of data collected by the CMS experiment at the LHC in pp collisions at √s = 7 TeV. The two states are measured via their radiative decays χc→J/ψ+γ, with the photon converting into an e+e- pair for J/ψ rapidity {pipe}y(J/ψ){pipe}<1.0 and photon transverse momentum pT(γ)>0.5 GeV/c. The measurement is given for six intervals of pT(J/ψ) between 7 and 25 GeV/c. The results are compared to theoretical predictions. © 2012 CERN for the benefit of the CMS collaboration.