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

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 ∓]) 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.