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Measurements of psi(2S) and X(3872) -> J/psi pi (+) pi (-) production in pp collisions at root s=8 Tev with the ATLAS detector
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
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Number of Authors: 2860
2017 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, no 1, 117Article in journal (Refereed) Published
Abstract [en]

Differential cross sections are presented for the prompt and non-prompt production of the hidden-charm 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 cross-sections X(3872)/psi(2S) is also given, separately for prompt and non-prompt components, as well as the non-prompt fractions of X(3872) and psi(2S). Assuming independent single effective lifetimes for non-prompt X(3872) and psi(2S) production gives separating short- and long-lived contributions, assuming that the short-lived 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 non-prompt 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.

Place, publisher, year, edition, pages
2017. no 1, 117
Keyword [en]
B physics, Hadron-Hadron scattering (experiments)
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-319387DOI: 10.1007/JHEP01(2017)117ISI: 000394175000001OAI: oai:DiVA.org:uu-319387DiVA: diva2:1086740
Note

ATLAS Collaboration, for complete list of authors see https://doi.org/10.1007/JHEP01(2017)117

Available from: 2017-04-04 Created: 2017-04-04 Last updated: 2017-04-04Bibliographically approved

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Bergeås, Elin KuutmannBrenner, RichardEkelöf, TordEllert, MattiasFerrari, ArnaudGradin, P.O. JoakimMadsen, AlexanderÖhman, HenrikRangel-Smith, Camilla
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