Search for the Lepton-Flavor-Violating Decays B[0 over s] → e[superscript ±]μ[superscript ∓] and B[superscript 0] → e[superscript ±]μ[superscript ∓]
Author(s)
Williams, Michael
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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.
Date issued
2013-09Department
Massachusetts Institute of Technology. Department of PhysicsJournal
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
ISSN
0031-9007
1079-7114