Light quark decays of doubly heavy baryons in light front approach

TL;DR

This paper calculates decay properties of doubly heavy baryons using a light front quark model, providing predictions for decay rates and asymmetries that could be tested in experiments like LHCb.

Contribution

It introduces a detailed calculation of decay form factors and phenomenological observables for doubly heavy baryons in the light front approach, which is novel.

Findings

Semileptonic decay branching fractions are around 10^{-7} to 10^{-8}.

Nonleptonic decay branching fractions are around 10^{-5}.

Results are potentially detectable in experiments such as LHCb.

Abstract

We explore the semileptonic and nonleptonic decays of doubly heavy baryons $(\Omega_{cc}^ {(*) +}, \Omega_{bb}^ {(*)0}, \Omega_{bc}^ {(*) -}, \Omega_{bc}^ {\prime 0}) $ induced by the $s\to u$ transition. Hadronic form factors are parametrized by transition matrix elements and are calculated in the light front quark model. With the form factors, we make use of helicity amplitudes and analyze semileptonic and nonleptonic decay modes of doubly heavy baryons. Benchmark results for partial decay widths, branching fractions, forward-backward asymmetries and other phenomenological observables are derived. We find that typical branching fractions for semileptonic decays into $\ell\bar\nu$ are at the order $10^ {-7}-10^ {-8} $ and the ones for nonleptonic decays are at the order $10^ {-5} $, which are likely detectable such as in LHCb experiment. With the potential data accumulated in future, our results may help to shape our understanding of the decay mechanism in the presence of two heavy quarks.