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

ATLAS Collaboration

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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√=8s=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))×10−2RB=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.
Original languageEnglish
Article number117
Number of pages43
JournalJournal of High Energy Physics
Volume2017
Issue number1
DOIs
Publication statusPublished - Jan 2017

Bibliographical note

42 pages in total, author list starting page 26, 10 figures, 8 tables. Submitted to JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2015-03/

Keywords

  • hep-ex
  • B physics
  • Hadron-Hadron scattering (experiments)

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