T-Anomaly Induced LHC Signals

TL;DR

This paper investigates anomaly-induced decays in the Little Higgs model with T-parity violation, leading to distinctive LHC signals involving fully reconstructable events and varying decay modes of heavy particles.

Contribution

It provides a detailed analysis of anomaly-induced decay modes and their impact on LHC signals in the Little Higgs model with T-parity violation.

Findings

Anomaly-induced decays allow T-odd $A_H$ to decay into $ZZ$ and $W^+W^-$.

Three-body decay branching fractions increase with the symmetry-breaking scale $f$.

Heavy quark three-body decays reach up to 10% branching ratio.

Abstract

$\cal T$-parity in the Little Higgs model could be violated by anomalies that allow the lightest $\cal T$-odd $A_H$ to decay into $ZZ$ and $W^+W^-$. We analyze these anomaly induced decays and the two-particle and the three-particle decay modes of other heavy quarks and bosons in this model which yield unique Large Hadron Collider (LHC) signals with fully reconstructable events. $\cal T$-odd quarks in the Little Higgs model are nearly degenerate in mass and they decay by almost identical processes; however, members of the heavy Higgs triplet follow distinct decay modes. The branching fractions of three-body decays increase with the global symmetry-breaking energy scale $f$ and are found to be at the level of a few percent in heavy quark decays while they can reach up to 10% for heavy bosons.