Search for $B^+ \to e^+ \nu$ and $B^+ \to \mu^+ \nu$ decays using hadronic tagging

We present a search for the rare leptonic decays B+→e+νe and B+→μ+νμ, using the full ϒ(4S) data sample of 772×106 BB¯ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. One of the B mesons from the ϒ(4S)→BB¯ decay is fully reconstructed in a hadronic mode, while the recoiling side is analyzed for the signal decay. We find no evidence of a signal in any of the decay modes. Upper limits of the corresponding branching fractions are determined as B(B+→e+νe)<3.5×10-6 and B(B+→μ+νμ)<2.7×10-6 at 90% confidence level.

Note:

13 pages, 7 figures, Submitted to PRD

13.20.-v
12.15.Hh
13.25.Hw
B+: leptonic decay
BELLE
KEK-B
electron positron: annihilation
B: pair production
B-: hadronic decay
B+: branching ratio: upper limit

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