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Measurements of ψ(2S) and X(3872) → J/ψπ+π− production in pp collisions at s√=8s=8 TeV with the ATLAS detector

Aaboud, M; Aad, G; Abbott, B; Abdallah, J; Abdinov, O; Abeloos, B; Aben, R; ... Annovi, A; + view all (2017) Measurements of ψ(2S) and X(3872) → J/ψπ+π− production in pp collisions at s√=8s=8 TeV with the ATLAS detector. Journal of High Energy Physics , 2017 (1) , Article 117. 10.1007/JHEP01(2017)117. Green open access

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Abstract

Differential cross sections are presented for the prompt and non-prompt production of the hidden-charm states X(3872) and ψ(2S), in the decay mode J/ψπ+π−, measured using 11.4 fb−1 of pp collisions at s=8 TeV by the ATLAS detector at the LHC. The ratio of cross-sections X(3872)/ψ(2S) is also given, separately for prompt and non-prompt components, as well as the non-prompt fractions of X(3872) and ψ(2S). Assuming independent single effective lifetimes for non-prompt X(3872) and ψ(2S) production gives RB=ℬ(B→X(3872)+any)ℬ(X(3872)→J/ψπ+π−)/ℬ(B→ψ(2S)+any)ℬ(ψ(2S)→J/ψπ+π−)=(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 ψ(2S) decays are also measured and compared to theoretical predictions.[Figure not available: see fulltext.]

Type: Article
Title: Measurements of ψ(2S) and X(3872) → J/ψπ+π− production in pp collisions at s√=8s=8 TeV with the ATLAS detector
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/JHEP01(2017)117
Publisher version: http://dx.doi.org/10.1007/JHEP01(2017)117
Language: English
Additional information: © The Author(s) 2017. JHEP is an open-access journal funded by SCOAP3 and licensed under CC BY 4.0
Keywords: B physics; Hadron-Hadron scattering (experiments)
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1546063
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