Measurements of the ϒ(1S), ϒ(2S), and ϒ(3S) differential cross sections in pp collisions at √s = 7 TeV

CMS Collaboration

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Differential cross sections as a function of transverse momentum pT are presented for the production of ϒ(nS) (n=1, 2, 3) states decaying into a pair of muons. Data corresponding to an integrated luminosity of 4.9fb−1in pp collisions at √s = 7 TeV were collected with the CMS detector at the LHC. The analysis selects events with dimuon rapidity |y| < 1.2 and dimuon transverse momentum in the range 10 < pT < 100 GeV. The measurements show a transition from an exponential to a power-law behavior at pT ≈ 20 GeV for the three ϒ states. Above that transition, the ϒ(3S) spectrum is significantly harder than that of the ϒ(1S). The ratios of the ϒ(3S) and ϒ(2S) differential cross sections to the ϒ(1S) cross section show a rise as pT increases at low pT, then become flatter at higher pT.
Original languageEnglish
Pages (from-to)14-34
Number of pages21
JournalPhysics Letters B
Publication statusPublished - 2015
Externally publishedYes


  • CMS
  • Upsilon
  • B-Physics
  • Cross section

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