Search for the decay $B^{-}\to {\Lambda }_c^{+}\bar{p}{\ell }^{-}{\bar{\nu }}_{\ell }$ with the BABAR detector

Abstract

This work presents the search for the semileptonic baryonic B decay $B^{-}\to {\Lambda }_c^{+}\bar{p}{\ell }^{-}{\bar{\nu }}_{\ell }$. The used data comprises the complete BABAR data set of $470\cdot 10^6$ $B\bar{B}$ events, collected at the SLAC National Accelerator Laboratory. Using a pole-model decay simulation, we obtain upper limits with $90\%$ confidence level of $B(B^{-}\to {\Lambda }_c^{+}\bar{p}{e}^{-}{\bar{\nu }}_e)\cdot \frac{B({\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+})}{5\%}<1.2\times 10^{-4}$, $B(B^{-}\to {\Lambda }_c^{+}\bar{p}{\mu }^{-}{\bar{\nu }}_{\mu })\cdot \frac{B({\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+})}{5\%}<2.5\times 10^{-4}$, $B(B^{-}\to {\Lambda }_c^{+}\bar{p}{\ell }^{-}{\bar{\nu }}_{\ell })\cdot \frac{B({\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+})}{5\%}<1.0\times 10^{-4}$. These results are in slight tension with predictions based on the measurement of $B^{-}\to \bar{p}p{\ell }^{-}{\bar{\nu }}_{\ell }$ and $B^{-}\to {\Lambda }_c^{+}\bar{p}{\pi }^{-}$.

arXiv commentPhD thesis; defense at University of Rostock (Germany): 19.12.2014