Evidence for $B^{+}\to \omega l^{+}\nu$

Abstract

We have searched for the decay $B^{+}\to \omega l^{+}\nu$ ($l=e$ or $\mu$) in 78 fb${}^{-1}$ of ${\rm Y}(4S)$ data (85 million $B\bar{B}$ events) accumulated with the Belle detector. The final state is fully reconstructed using the $\omega$ decay into ${\pi }^{+}{\pi }^{-}{\pi }^0$, combined with detector hermeticity to estimate the neutrino momentum. A signal of $414\pm 125$ events is found in the data, corresponding to a branching fraction of $(1.3\pm 0.4\pm 0.2\pm 0.3)\times 10^{-4}$, where the first two errors are statistical and systematic, respectively. The third error reflects the estimated form-factor uncertainty.

9 pages, 1 figure

References in corpus (9)

• Semileptonic Meson Decays in the Quark Model: An Update
• Exclusive Semileptonic and Rare B-Meson Decays in QCD
• Electron Identification in Belle
• B -> X_u l nu decay distributions to order alpha_s
• Lattice-Constrained Parametrizations of Form Factors for Semileptonic and Rare Radiative B Decays
• Soft Pion Emission in Semileptonic $B$-Meson Decays
• Study of the q^2-Dependence of B --> pi ell nu and B --> rho(omega)ell nu Decay and Extraction of |V_ub|
• Measurement of the CKM Matrix Element |Vub| with B->rho e nu Decays
• Measurement of Inclusive Production of Neutral Pions from Upsilon(4S) Decays

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