Measurements of ?(2S) and X(3872) ? J/?p+p- production in pp collisions at vs=8 TeV with the ATLAS detector

Differential cross sections are presented for the prompt and non-prompt production of the hidden-charm states X(3872) and ?(2S), in the decay mode J/?p+p-, measured using 11.4 fb-1 of pp collisions at vs=8 TeV by the ATLAS detector at the LHC. The ratio of cross-sections X(3872)/?(2S) is also given, separately for prompt and non-prompt components, as well as the non-prompt fractions of X(3872) and ?(2S). Assuming independent single effective lifetimes for non-prompt X(3872) and ?(2S) production gives RB=B(B?X(3872)+any)B(X(3872)?J/?p+p-)B(B??(2S)+any)B(?(2S)?J/?p+p-)=(3.95±0.32(stat)±0.08(sys))×10-2RB=B(B?X(3872)+any)B(X(3872)?J/?p+p-)B(B??(2S)+any)B(?(2S)?J/?p+p-)=(3.95±0.32(stat)±0.08(sys))×10-2 separating short- and long-lived contributions, assuming that the short-lived component is due to Bc decays, gives RB = (3.57 ± 0.33(stat) ± 0.11(sys)) × 10-2, with the fraction of non-prompt X(3872) produced via Bc decays for pT(X(3872)) > 10 GeV being (25 ± 13(stat) ± 2(sys) ± 5(spin))%. The distributions of the dipion invariant mass in the X(3872) and ?(2S) decays are also measured and compared to theoretical predictions.