Study of the rare decays of Bs0 and B0 mesons into muon pairs using data collected during 2015 and 2016 with the ATLAS detector

ATLAS Collaboration, Paul Newman

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55 Citations (Scopus)
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Abstract

A study of the decays Bs0 → μ+μ and B0 → μ+μ has been performed using 26.3 fb−1 of 13 TeV LHC proton-proton collision data collected with the ATLAS detector in 2015 and 2016. Since the detector resolution in μ+μ invariant mass is comparable to the Bs0 -B0 mass difference, a single fit determines the signal yields for both decay modes. This results in a measurement of the branching fraction B(Bs0→μ+μ)=(3.2+1.1−1.0)×10−9 and an upper limit B(B0→μ+μ)<4.3×10−10  at 95% confidence level. The result is combined with the Run 1 ATLAS result, yielding B(Bs0→μ+μ−)=(2.8+0.8−0.7)×10−9 and B(B0→μ+μ)<2.1×10−10  at 95% confidence level. The combined result is consistent with the Standard Model prediction within 2.4 standard deviations in the B(B0→μ+μ)−B(Bs0→μ+μ) plane.
Original languageEnglish
Article number98
Number of pages47
JournalJHEP
Volume2019
Issue number4
DOIs
Publication statusPublished - 15 Apr 2019

Bibliographical note

44 pages in total, author list starting page 28, 10 figures, 3 tables, submitted to JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2018-09

Keywords

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

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