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

Baringer, Philip S.
Bean, Alice
Murray, Michael J.
Sanders, Stephen J.
CMS Collaboration
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Abstract
Differential cross sections as a function of transverse momentum pTare 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 TeVwere collected with the CMS detector at the LHC. The analysis selects events with dimuon rapidity |y| <1.2and 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 GeVfor the three ϒstates. 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 pTincreases at low pT, then become flatter at higher pT.
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Date
2015-07-22
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Publisher
Elsevier
Research Projects
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Keywords
CMS, Upsilon, B-Physics, Cross section
Citation
Khachatryan, V., Apresyan, A., Bornheim, A., Bunn, J., Chen, Y., Duarte, J., ... & Spiropulu, M. (2015). Measurements of the ϒ (1S), ϒ (2S), and ϒ (3S) differential cross sections in pp collisions at√ s= 7 TeV. Physics letters B, 749, 14-34.
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