Effect of both Z and Z'-mediated flavor-changing neutral currents on the baryonic rare decay $lambda_b$ decays into $lambda l^+l^- $

TL;DR

This paper investigates how Z and Z'-mediated flavor-changing neutral currents influence the rare decay of lambda_b into lambda and lepton pairs, suggesting potential signals of new physics beyond the Standard Model.

Contribution

It provides a detailed analysis of Z and Z' FCNC effects on lambda_b decays, highlighting possible enhancements in branching ratios indicating new physics.

Findings

Branching ratio is significantly enhanced by Z and Z' FCNCs.

The Z'-boson contribution depends on its mass value.

Results suggest potential signals of physics beyond the Standard Model.

Abstract

We study the effect of both Z and Z'-mediated flavor-changing neutral currents (FCNCs) on the $ lambda_b arrow lambda l^+l^- (l = mu, tau) $ rare decay. We find the branching ratio is reasonably enhanced from its standard model value due to the effect of both Z and Z'-mediated FCNCs, and gives the possibility of new physics beyond the standard model. The contribution of Z'-boson depends upon the precise value of the mass of Z' boson.