Measurements of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) differential cross sections in pp collisions at sqrt(s) = 7 TeV
(2015) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. B749, p. 14-34 (2015)
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- Abstract
- Differential cross sections as a function of transverse momentum pt are presented for the production of Y(nS) (n = 1, 2, 3) states decaying into a pair of muons. Data corresponding to an integrated luminosity of 4.9 inverse femtobarns in pp collisions at sqrt(s) = 7 TeV were collected with the CMS detector at the LHC. The analysis selects events with dimuon rapidity abs(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 Y states. Above that transition, the Y spectrum is significantly harder than that of the Y(1S) and Y(2S). The ratios of the Y(3S) and Y(2S) differential cross sections to the Y(1S) cross section show a rise as pt increases at low pt, then become flatter at higher pt.
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Citations
CMS, Basegmez, S., Bruno, G., Castello, R., Caudron, A., Ceard, L., Da Silveira, G. G., Delaere, C., Du Pree, T., Favart, D., Forthomme, L., Hollar, J., Jafari, A., Jez, P., Komm, M., Lemaitre, V., Nuttens, C., Perrini, L., Pin, A., et al. (2015). Measurements of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) differential cross sections in pp collisions at sqrt(s) = 7 TeV. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, B749, 14-34. https://doi.org/10.1016/j.physletb.2015.07.037 (Original work published 2015)