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Search for the Lepton-Flavor-Violating Decays B[0 over s] → e[superscript ±]μ[superscript ∓] and B[superscript 0] → e[superscript ±]μ[superscript ∓]

By Michael Williams

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.National Science Foundation (U.S.

Publisher: American Physical Society
Year: 2013
DOI identifier: 10.1103/PhysRevLett.111.141801
OAI identifier: oai:dspace.mit.edu:1721.1/84927
Provided by: DSpace@MIT
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