Inclusive semileptonic $\Lambda_b$ decays in the Standard Model and beyond

TL;DR

This paper analyzes inclusive semileptonic Lambda_b decays within the Standard Model and beyond, considering polarization effects and potential new physics operators affecting decay observables.

Contribution

It extends the theoretical framework to include D=6 semileptonic operators in the Standard Model effective Hamiltonian for Lambda_b decays, including polarization effects.

Findings

Quantitative predictions for decay rates and distributions.

Impact of new operators on observables.

Polarization effects in Lambda_b decays.

Abstract

Inclusive semileptonic decays of beauty baryons are studied using the heavy quark expansion to ${\cal O}(1/m_b^3)$, at leading order in $\alpha_s$. The case of a polarized decaying baryon is examined, with reference to $\Lambda_b$. An extension of the Standard Model effective Hamiltonian inducing $b \to U \ell {\bar \nu}_ \ell$ transitions ($U=u,\,c$ and $\ell=e,\,\mu,\,\tau$) is considered, which comprises the full set of D=6 semileptonic operators with left-handed neutrinos. The effects of the new operators in several observables are described.