Differential cross sections as a function of transverse momentum p<inf>T</inf> 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<sup>-1</sup> in pp collisions at s=7TeV 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<p<inf>T</inf><100GeV. The measurements show a transition from an exponential to a power-law behavior at p<inf>T</inf>≈20GeV 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 p<inf>T</inf> increases at low p<inf>T</inf>, then become flatter at higher p<inf>T</inf>.
Measurements of the ϒ(1S), ϒ(2S), and ϒ(3S) differential cross sections in pp collisions at s=7TeV
FERRETTI, ROBERTA;LO VETERE, MAURIZIO;TOSI, SILVANO;
2015-01-01
Abstract
Differential cross sections as a function of transverse momentum pT<100GeV. The measurements show a transition from an exponential to a power-law behavior at p
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