Measurement of Bc (2S)+ and Bc∗ (2S)+ cross section ratios in proton-proton collisions at s =13 TeV


Sirunyan A., Tumasyan A., Adam W., Ambrogi F., Arnold B., Bergauer H., ...Daha Fazla

Physical Review D, cilt.102, sa.9, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 102 Sayı: 9
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1103/physrevd.102.092007
  • Dergi Adı: Physical Review D
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, INSPEC, zbMATH
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

The ratios of the Bc(2S)+ to Bc+, Bc∗(2S)+ to Bc+, and Bc∗(2S)+ to Bc(2S)+ production cross sections are measured in proton-proton collisions at s=13 TeV, using a data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 143 fb-1. The three measurements are made in the Bc+ meson phase space region defined by the transverse momentum pT>15 GeV and absolute rapidity |y|<2.4, with the excited Bc(∗)(2S)+ states reconstructed through the Bc(∗)+π+π-, followed by the Bc+→J/ψπ+ and J/ψ→μ+μ- decays. The Bc(2S)+ to Bc+, Bc∗(2S)+ to Bc+, and Bc∗(2S)+ to Bc(2S)+ cross section ratios, including the unknown Bc(∗)(2S)+→Bc(∗)+π+π- branching fractions, are (3.47±0.63(stat)±0.33(syst))%, (4.69±0.71(stat)±0.56(syst))%, and 1.35±0.32(stat)±0.09(syst), respectively. None of these ratios shows a significant dependence on the pT or |y| of the Bc+ meson. The normalized dipion invariant mass distributions from the decays Bc(∗)(2S)+→Bc(∗)+π+π- are also reported.