Semi-leptonic Decay of Lambda-b in the Standard Model and with New Physics

TL;DR

This paper calculates observables for the semi-leptonic decay of Lambda_b baryons within the Standard Model and with potential New Physics contributions, aiding future experimental tests at CERN's LHCb.

Contribution

It provides theoretical predictions for Lambda_b semi-leptonic decay observables considering both Standard Model and New Physics effects, enhancing the understanding of possible physics beyond the SM.

Findings

Calculated decay observables in SM and NP scenarios

Provided predictions for upcoming LHCb measurements

Analyzed impact of different Lorentz structures in NP

Abstract

Heavy quark decays provide a very advantageous investigation to test the Standard Model (SM). Recently, promising experiments with \textit{b} quark, as well as the analysis of the huge data sets produced at the B factories, have led to an increasing study and sensitive measurements of relative \textit{b} quark decays. In this thesis, I calculate various observables in the semi-leptonic decay process $\Lambda_{b}\to \Lambda_{c}\tau\bar{\nu}_{\tau}$ both in the SM and in the presence of New Physics (NP) operators with different Lorentz structures. The results are relevant for the coming measurement of this semi-leptonic decay at LHC \textit{b} experiment in CERN, and also provide theoretical predictions to refine the physics beyond the SM.