Differential cross sections as a function of transverse momentum pT are presented for the production of Ï(nS) (n = 1, 2, 3) states decaying into a pair of muons. Data corresponding to an integrated luminosity of 4.9fb-1 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 10T<100GeV. The measurements show a transition from an exponential to a power-law behavior at pTâ20GeV for the three Ï states. Above that transition, the Ï(3S) spectrum is significantly harder than that of the Ï(1S). The ratios of the Ï(3S) and Ï(2S) differential cross sections to the Ï(1S) cross section show a rise as pT increases at low pT, then become flatter at higher pT.
Measurements of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) differential cross sections in pp collisions at root s=7 TeV
ALBERGO, Sebastiano Francesco;CAPPELLO, GIGI;CHIORBOLI, MASSIMILIANO;COSTA, Salvatore;GIORDANO, FERDINANDO;POTENZA, Renato Carlo;TRICOMI, Alessia Rita;TUVE', Cristina Natalina;
2015-01-01
Abstract
Differential cross sections as a function of transverse momentum pT are presented for the production of Ï(nS) (n = 1, 2, 3) states decaying into a pair of muons. Data corresponding to an integrated luminosity of 4.9fb-1 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 10T<100GeV. The measurements show a transition from an exponential to a power-law behavior at pTâ20GeV for the three Ï states. Above that transition, the Ï(3S) spectrum is significantly harder than that of the Ï(1S). The ratios of the Ï(3S) and Ï(2S) differential cross sections to the Ï(1S) cross section show a rise as pT increases at low pT, then become flatter at higher pT.File | Dimensione | Formato | |
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