Study of the rare decays of B s 0 and B 0 mesons into muon pairs using data collected during 2015 and 2016 with the ATLAS detector
- Collaboration, ATLAS
- Barton, A.E.
- Bertram, I.A.
- Borissov, G.
- Bouhova-Thacker, E.V.
- Fox, H.
- Henderson, R.C.W.
- Jones, R.W.L.
- Kartvelishvili, V.
- Long, R.E.
- Love, P.A.
- Muenstermann, D.
- Parker, A.J.
- Smizanska, M.
- Tee, A.S.
- Walder, J.
- Wharton, A.M.
- Whitmore, B.W.
DOIAbstract
A study of the decays B s 0 → μ + μ − and B 0 → 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 B s 0 -B 0 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−)=(3.2−1.0+1.1)×10−9 and an upper limit ℬ (B→ 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−)=(2.8−0.7+0.8)×10−9 and ℬ (B→ μ + μ − ) <2.1 × 10 − 10 at 95% confidence level. The combined result is consistent with the Standard Model prediction within 2.4 ...
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