Search for the Lepton-Flavor-Violating Decays B[0 over s] → e[superscript ±]μ[superscript ∓] and B[superscript 0] → e[superscript ±]μ[superscript ∓]
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Aaij-2013-Search for the Lepton.pdf
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Author(s)
Williams, Michael
Date Issued
September 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. “Search for the Lepton-Flavor-Violating Decays B[0 over s] → e[superscript ±]μ[superscript ∓] and B[superscript 0] → e[superscript ±]μ[superscript ∓].” Physical Review Letters 111, no. 14 (September 2013). © 2013 CERN, for the LHCb Collaboration
Version
Final published version
Abstract
A search for the lepton-flavor-violating decays B[0 over s] → e[superscript ±]μ[superscript ∓] and B[superscript 0] → e[superscript ±]μ[superscript ∓] is performed with a data sample, corresponding to an integrated luminosity of 1.0 fb[superscript −1] of pp collisions at √s = 7 TeV, collected by the LHCb experiment. The observed number of B[0 over s] → e[superscript ±]μ[superscript ∓] and B[superscript 0] → e[superscript ±]μ[superscript ∓] candidates is consistent with background expectations. Upper limits on the branching fractions of both decays are determined to be B(B[0 over s]→ e[superscript ±]μ[superscript ∓]) <1.1(1.4) × 10[superscript −8] and B(B[superscript 0] → e[superscript ±]μ[superscript ∓]) <2.8(3.7) × 10[superscript −9] at 90% (95%) confidence level (C.L.). These limits are a factor of 20 lower than those set by previous experiments. Lower bounds on the Pati-Salam leptoquark masses are also calculated, M[subscript LQ](B[0 over s] → e[superscript ±]μ[superscript ∓]) > 101 TeV/c[superscript 2] and M[subscript LQ](B[superscript 0] → e[superscript ±]μ[superscript ∓]) > 126 TeV/c[superscript 2] at 95% C.L., and are a factor of 2 higher than the previous bounds.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.111.141801
