Search for Two-Body $B$ Meson Decays to $\hat{I}{›}^0$ and $\hat{I}{\text{c◯}}_c^{(\ast )0}$

Abstract

We report the results of the first search for Standard Model and baryon-number-violating two-body decays of the neutral $B$ mesons to $\hat{I}{›}^0$ and $\hat{I}{\text{c◯}}_c^{(\ast )0}$ using 711~$\mathrm{f}{\mathrm{b}}^{-1}$ of data collected at the $\hat{I}\yen (4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. We observe no evidence of signal from any such decays and set 95\% confidence-level upper limits on the products of $B^0$ and ${\bar{B}}^0$ branching fractions for these two-body decays with $\mathcal{B}(\hat{I}{\text{c◯}}_c^0\to \ddot{I}{€}^{+}\hat{I}{\text{c◯}}^{-})$ in the range between 9.5~$\times 10^{-8}$ and 31.2~$\times 10^{-8}$.

6 pages, 2 figures, submitted to PRD(L)