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Title: Measurements of the $$\Upsilon$$(1S), $$\Upsilon$$(2S), and $$\Upsilon$$(3S) differential cross sections in pp collisions at $$\sqrt{s} =$$ 7 TeV

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. Thus, data corresponding to an integrated luminosity of 4.9 fb-1 in 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 theγ Υ(1S) cross section show a rise as pT increases at low pT, then become flatter at higher pT.
  1. Yerevan Physics Inst. (YerPhI), Yerevan (Armenia). et al.
Publication Date:
Report Number(s):
FERMILAB-PUB-15-024-CMS; CERN-PH-EP-2015-007; CMS-BPH-12-006
Journal ID: ISSN 0370-2693; arXiv eprint number arXiv:1501.07750; TRN: US1601065
Grant/Contract Number:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 749; Journal ID: ISSN 0370-2693
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
CMS Collaboration
Country of Publication:
United States
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CMS; upsilon; B-physics; cross section
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1221244