Measurement of the X(3872) production cross section via decays to J/psi pi pi in pp collisions at sqrt(s) = 7 TeV
(2013) Journal of High Energy Physics — Vol. 4, n° 154, p. 1-38 (2013)
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- Abstract
- The production of the X(3872) is studied in pp collisions at TeX TeV, using decays to J/ψπ + π −, where the J/ψ decays to two muons. The data were recorded by the CMS experiment and correspond to an integrated luminosity of 4.8 fb−1. The measurements are performed in a kinematic range in which the X(3872) candidates have a transverse momentum 10 < p T < 50 GeV and rapidity |y| < 1.2. The ratio of the X(3872) and ψ(2S) cross sections times their branching fractions into J/ψπ + π − is measured as a function of p T. In addition, the fraction of X(3872) originating from B decays is determined. From these measurements the prompt X(3872) differential cross section times branching fraction as a function of p T is extracted. The π + π − mass spectrum of the J/ψπ + π − system in the X(3872) decays is also investigated.
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CMS Collaboration, Quertenmont, L., Basegmez, S., Bruno, G., Castello, R., Ceard, L., Delaere, C., Du Pree, T., Favart, D., Forthomme, L., Giammanco, A., Hollar, J., Lemaitre, V., Liao, J., Militaru, O., Nuttens, C., Pagano, D., Pin, A., Piotrzkowski, K., et al. (2013). Measurement of the X(3872) production cross section via decays to J/psi pi pi in pp collisions at sqrt(s) = 7 TeV. Journal of High Energy Physics, 4(154), 1-38. https://doi.org/10.1007/JHEP04(2013)154 (Original work published 2013)