Study of the rare decays of B0 and B-0 mesons into muon pairs using data collected during 2015 and 2016 with the ATLAS detector



Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abhayasinghe, DK, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2909 more authors) (2019) Study of the rare decays of B0 and B-0 mesons into muon pairs using data collected during 2015 and 2016 with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 04 (4). 098-.

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Abstract

A study of the decays $B^0_s \to \mu^+\mu^-$ and $B^0 \to \mu^+\mu^-$ 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 $\mu^+\mu^-$ 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 ${\cal B}(B^0_s \to \mu^+\mu^-) = \left( 3.2^{+1.1}_{-1.0} \right) \times 10^{-9}$ and an upper limit ${\cal B}(B^0 \to \mu^+\mu^-) < 4.3 \times 10^{-10}$ at 95% confidence level. The result is combined with the Run 1 ATLAS result, yielding ${\cal B}(B^0_s \to \mu^+\mu^-) = \left( 2.8^{+0.8}_{-0.7} \right) \times 10^{-9}$ and ${\cal B}(B^0 \to \mu^+\mu^-) < 2.1 \times 10^{-10}$ at 95% confidence level. The combined result is consistent with the Standard Model prediction within 2.4 standard deviations in the ${\cal B}(B^0 \to \mu^+\mu^-)$-${\cal B}(B^0_s \to \mu^+\mu^-)$ plane.

Item Type: Article
Additional Information: 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
Uncontrolled Keywords: Hadron-Hadron scattering (experiments)
Depositing User: Symplectic Admin
Date Deposited: 03 May 2019 09:57
Last Modified: 19 Jan 2023 00:52
DOI: 10.1007/JHEP04(2019)098
Open Access URL: https://link.springer.com/article/10.1007/JHEP04(2...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3039480