Physical observables in the decay $\Lambda_b \to \Lambda_c (\to \Lambda+\pi)+\tau^{-}+\bar \nu_{\tau}$

TL;DR

This paper investigates tauonic semileptonic decay of the Lambda_b baryon, focusing on lepton helicity effects, polarization, and asymmetries, using a covariant confined quark model for numerical analysis.

Contribution

It provides a detailed analysis of decay observables including polarization and asymmetries, emphasizing lepton helicity flip contributions in Lambda_b decays.

Findings

Calculated total decay rate and distributions.

Analyzed polarization components of Lambda_c and tau.

Provided numerical results for asymmetries and helicity effects.

Abstract

We analyze the tauonic semileptonic baryon decays $\Lambda^0_b \to \Lambda^+_c + \tau^{-} +\bar \nu_{\tau}$ with particular emphasis on the lepton helicity flip contributions which vanish for zero lepton masses. We calculate the total rate, differential decay distributions, the longitudinal and transverse polarization components of the $\Lambda^+_c$ and the $\tau^-$, and the lepton-side forward-backward asymmetries. We use the covariant confined quark model to provide numerical results on these observables.