Higher twist corrections to doubly-charmed baryonic $B$ decays

TL;DR

This paper studies doubly-charmed baryonic B decays using perturbative QCD, including higher twist effects, to better match experimental data and predict angular asymmetries for future tests.

Contribution

It incorporates higher twist contributions to LCDAs and analyzes SU(3) symmetry breaking effects in doubly-charmed baryonic B decays within the PQCD framework.

Findings

Higher twist effects improve decay rate predictions.

SU(3) symmetry breaking is crucial for understanding measurements.

First evaluation of angular asymmetries in these decays.

Abstract

Baryonic two-body $B$ mesons decays have been measured experimentally for some time, which provides an excellent ground for studying the QCD of baryonic $B$ decays. In this work, we investigate the two-body doubly-charmed baryonic $B$ decays in the perturbative QCD (PQCD) approach including higher twist contributions to the light-cone distribution amplitudes (LCDAs). The charmed baryon LCDAs are included up to the twist four and the effect of the subleading component of the $B$ meson LCDAs is studied for details. With the inclusion of these higher-power contributions, the PQCD results on rates can explain the current experimental data well. Moreover, we note that the SU(3) symmetry breaking is important in the concerned processes and play an essential role in understanding the measurements of $\mathcal{B}(\overline{B}^0\to \Lambda_c^+\overline \Lambda_c^-)$ and $ \mathcal{B}({B}^-\to\Xi_c^0\overline \Lambda_c^-)$. We also evaluate the angular asymmetries for the first time, which have neither been measured experimentally nor calculated theoretically. All these predictions can be tested in future.