Search for baryon and lepton number violating decays $\boldsymbol{D \rightarrow p\ell}$
hep-ex
/ Authors
Belle Collaboration, S. Maity, R. Garg, S. Bahinipati, V. Bhardwaj, H. Aihara, S. Al Said, DM Asner, H. Atmacan, T. Aushev
and 152 more authors
R. Ayad, V. Babu, Sw. Banerjee, M. Bauer, J. Bennett, M. Bessner, D. Biswas, A. Bobrov, D. Bodrov, G. Bonvicini, J. Borah, M. Bračko, P. Branchini, A. Budano, M. Campajola, D. Červenkov, M. -C. Chang, P. Chang, K. Chilikin, H. E. Cho, K. Cho, S. -J. Cho, S. -K. Choi, Y. Choi
/ Abstract
We search for the baryon and lepton number violating charm decays, $D \rightarrow p\ell$, where $D$ is either a $D^0$ or a $\overline{D}^0$ and $\ell$ is a muon or an electron, using a data sample of $921\,\mathrm{fb}^{-1}$ collected by the Belle detector at the KEKB asymmetric energy $e^{+}e^{-}$ collider. In the absence of significant signals, we set upper limits on the branching fractions in the range $(5 - 8) \times 10^{-7}$ at a 90\% confidence level, depending on the decay mode.