PoS - Proceedings of Science
Volume 282 - 38th International Conference on High Energy Physics (ICHEP2016) - Quark and Lepton Flavor Physics
Charmless semileptonic B decays at Belle
C. Beleno* On behalf of the BELLE II collaboration
*corresponding author
Full text: pdf
Pre-published on: February 06, 2017
Published on: April 19, 2017
Abstract
We report two analyses involving semileptonic $B$ meson decays to charmless final states: ${B^{+}\to \eta^{(\prime)}\ell^{+}\nu_{\ell} }$ and ${ B^{0}\to \pi^{-}\tau^{+}\nu_{\tau} }$. These results are based on a 711 fb$^{-1}$ data sample, corresponding to $772 \times 10^{6}$ $B\bar{B}$ pairs, collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^{+}e^{-}$ collider. One of the two $B$ mesons is fully reconstructed into hadronic decay modes, whereas the remainder of the event is used to study the signal channel. Branching ratios are extracted using a binned maximum likelihood fit method, resulting in $ {\cal B}(B^{+}\to \eta\ell^{+}\nu_{\ell}) = (0.42\pm0.11_{\rm stat}\pm 0.03_{\rm syst} )\times 10^{-4} $. However, given the low significance for the other channels, an upper limit at 90\% confidence level is provided: ${ {\cal B}(B^{+}\to \eta^{\prime}\ell^{+}\nu_{\ell}) < 0.76 \times 10^{-4} }$ and ${ {\cal B}(B^{0}\to \pi^{-}\tau^{+}\nu_{\tau}) < 2.5 \times 10^{-4} }$.
DOI: https://doi.org/10.22323/1.282.0557
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.