Adomeit, S.; Bender, M.; Biebel, O.; Bock, C.; Chow, B. K. B.
(2017):
Measurements of psi(2S) and X(3872) > J/psi pi (+) pi () production in pp collisions at root s=8 Tev with the ATLAS detector.
In: Journal of High Energy Physics, No. 1, 117

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Abstract
Differential cross sections are presented for the prompt and nonprompt production of the hiddencharm states X(3872) and psi(2S), in the decay mode J/psi pi (+) pi (), measured using 11.4 fb(1) of pp collisions at root s = 8 Tev by the ATLAS detector at the LHC. The ratio of crosssections X(3872)/psi(2S) is also given, separately for prompt and nonprompt components, as well as the nonprompt fractions of X(3872) and psi(2S). Assuming independent single effective lifetimes for nonprompt X(3872) and psi(2S) production gives separating short and longlived contributions, assuming that the shortlived component is due to B (c) decays, gives R (B) = (3.57 +/ 0.33(stat) +/ 0.11(sys)) x 10(2), with the fraction of nonprompt X(3872) produced via B (c) decays for p (T)(X(3872)) > 10 GeV being (25 +/ 13(stat) +/ 2(sys) +/ 5(spin))%. The distributions of the dipion invariant mass in the X(3872) and psi(2S) decays are also measured and compared to theoretical predictions.