R_b Constraints on Littlest Higgs Model with T-parity

TL;DR

This paper investigates how precision measurements of the R_b branching ratio constrain the masses of T-odd fermions within the Littlest Higgs model with T-parity, highlighting the model's testability through collider data.

Contribution

It provides new constraints on T-odd fermion masses using R_b data within the LHT framework, enhancing understanding of the model's parameter space.

Findings

R_b data strongly constrains T-odd fermion masses

T-odd particles significantly affect R_b

Precision electroweak measurements test LHT predictions

Abstract

In the framework of the littlest Higgs model with T-parity (LHT), we study the contributions of the T-even and T-odd particles to the branching ratio R_b. We find that the precision data of R_b can give strong constraints on the masses of T-odd fermions.