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Search for $$B^{-}tomu^{-}barnu_mu$$ decays at the Belle experiment

Belle実験における$$B^{-}tomu^{-}barnu_mu$$崩壊の探索

Sibidanov, A.*; 谷田 聖; Belle Collaboration*; 他187名*

Sibidanov, A.*; Tanida, Kiyoshi; Belle Collaboration*; 187 of others*

We report the result of a search for the decay $$B^{-}tomu^{-}barnu_mu$$. The signal events are selected based on the presence of a high momentum muon and the topology of the rest of the event showing properties of a generic $$B$$-meson decay, as well as the missing energy and momentum being consistent with the hypothesis of a neutrino from the signal decay. We find a 2.4 standard deviation excess above background including systematic uncertainties, which corresponds to a branching fraction of $${cal B}(B^{-}tomu^{-}barnu_mu) =(6.46 pm 2.22 pm 1.60) times10^{-7}$$ or a frequentist 90% confidence level interval on the $$B^{-}tomu^{-}barnu_mu$$ branching fraction of $$[2.9, 10.7]times 10^{-7}$$. This result is obtained from a 711 fb$$^{-1}$$ data sample that contains $$772 times 10^6$$ $$Bbar{B}$$ pairs, collected near the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+ e^-$$ collider.

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パーセンタイル:20.01

分野:Physics, Multidisciplinary

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