Lepton Asymmetries in FCNC Decays of {\Lambda}b

TL;DR

This paper calculates lepton polarization asymmetries in FCNC { extLambda}b decays, demonstrating their potential as model-independent probes for Wilson coefficients, unaffected by nonperturbative QCD effects.

Contribution

It introduces a method to compute lepton polarization asymmetries that are insensitive to transition form factors, aiding in the extraction of Wilson coefficients.

Findings

Polarization asymmetries are unaffected by form factors.

These asymmetries can be used to extract Wilson coefficients.

The approach is model-independent and robust against nonperturbative QCD effects.

Abstract

Lepton polarization asymmetries for the flavor-changing neutral current (FCNC) dileptonic decays of {\Lambda}b baryons are calculated using single-component analytic (SCA) and multicomponent numerical (MCN) form factors. We show that these polarization asymmetries are insensitive to the transition form factors and, thus, the effects of QCD in the nonperturbative regime. Therefore, these observables can provide somewhat model independent ways of extracting the Wilson coefficients.