Lepton polarization effects in "Lambda_b -> Lambda l+l-" decay in family non-universal Z' model

TL;DR

This paper investigates how a family non-universal Z' boson could influence lepton polarization and asymmetries in the rare Lambda_b decay, providing potential signals for new physics beyond the Standard Model.

Contribution

It introduces an analysis of Z' effects on lepton polarization and asymmetries in Lambda_b decay, highlighting shifts in observable quantities as indicators of new physics.

Findings

Double lepton polarizations P_TT and P_NN are sensitive to Z' contributions.

The zero position of the polarized forward-backward asymmetry A_FB^LL shifts due to Z' effects.

Determining the zero of A_FB^LL can help identify and discriminate Z' models.

Abstract

Possible manifestation of the family non-universal Z' boson effects in lepton polarization in rare, exclusive baryonic "Lambda_b -> Lambda l+l-" decay is examined. It is observed that the double lepton polarizations P_TT and P_NN are sensitive to the Z' contribution. Moreover, it is found that the zero position of the polarized forward-backward asymmetry A_FB^LL is shifted to the left compared to the standard model prediction. Therefore, determination of the zero value of A_FB^LL is quite an efficient tool for establishing new Z' boson, but also in discriminating various scenarios of the considered family non-universal Z' model.