Measurement of the B[subscript s]⁰→μ⁺μ⁻ Branching Fraction and Effective Lifetime and Search for B⁰→μ⁺μ⁻ Decays
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PhysRevLett.118.191801.pdf
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Author(s)
LHCB Collaboration
Boettcher, Thomas Julian
Ilten, Philip J
Williams, Michael
Date Issued
May 2017
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Aaij, R., B. Adeva, M. Adinolfi, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, et al. “Measurement of the B[subscript s]⁰→μ⁺μ⁻ Branching Fraction and Effective Lifetime and Search for B⁰→μ⁺μ⁻ Decays.” Physical Review Letters 118, 19 (May 2017): 191801 © 2017 CERN for the LHCb Collaboration
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Final published version
Abstract
Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. A search for the rare decays B[subscript s]⁰→μ⁺μ⁻ and B⁰→μ⁺μ⁻ is performed at the LHCb experiment using data collected in pp collisions corresponding to a total integrated luminosity of 4.4 fb⁻¹. An excess of B[subscript s]⁰→μ⁺μ⁻ decays is observed with a significance of 7.8 standard deviations, representing the first observation of this decay in a single experiment. The branching fraction is measured to be B(B[subscript s]⁰→μ⁺μ⁻ )=(3.0±0.6-0.2+0.3)×10⁻ ⁹, where the first uncertainty is statistical and the second systematic. The first measurement of the B⁰→μ⁺μ⁻ effective lifetime, τ(B[subscript s]⁰→μ⁺μ⁻)=2.04±0.44±0.05 ps, is reported. No significant excess of B⁰→μ⁺μ⁻ decays is found, and a 95% confidence level upper limit, B(B⁰→μ⁺μ⁻)<3.4×10-10, is determined. All results are in agreement with the standard model expectations.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PHYSREVLETT.118.191801
