Search for the lepton-flavour violating decays $B^0_s \rightarrow e^{\pm}μ^{\mp}$ and $B^0 \rightarrow e^{\pm} μ^{\mp}$
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Adeva, B.
name: Adinolfi, M.
name: Adrover, C.
name: Affolder, A.
name: Ajaltouni, Z.
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name: Appleby, R. B.
name: Gutierrez, O. Aquines
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name: Akiba, K. Carvalho
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name: Yushchenko, O.
name: Zangoli, M.
name: Zavertyaev, M.
name: Zhang, F.
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Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: A search for the lepton-flavour violating decays $B^0_s \to e^{\pm} μ^{\mp}$ and $B^0 \to e^{\pm} μ^{\mp}$ is performed with a data sample, corresponding to an integrated luminosity of 1.0 fb$^{-1}$ of $pp$ collisions at $\sqrt{s} = 7$ TeV, collected by the LHCb experiment. The observed number of $B^0_s \to e^{\pm} μ^{\mp}$ and $B^0 \to e^{\pm} μ^{\mp}$ candidates is consistent with background expectations. Upper limits on the branching fractions of both decays are determined to be $BR(B^0_s \to e^{\pm} μ^{\mp}) &lt; 1.1 \,(1.4) \times 10^{-8}$ and $BR (B^0 \to e^{\pm} μ^{\mp}) &lt; 2.8 \,(3.7) \times 10^{-9}$ at 90% (95%) confidence level (C.L.). These limits are a factor of twenty lower than those set by previous experiments. Lower bounds on the Pati-Salam leptoquark masses are also calculated, $M_{\rm LQ} (B^0_s \to e^{\pm} μ^{\mp}) &gt; 107$ TeV/c$^2$ and $M_{\rm LQ} (B^0 \to e^{\pm} μ^{\mp}) &gt; 126$ TeV/c$^2$ at 95% C.L., and are a factor of two higher than the previous bounds.
description: version published on Phys. Rev. Lett. (7 pages, 2 figures)