Testing the Littlest Higgs Model with T-parity at the Large Hadron Collider

TL;DR

This paper investigates the production and detection of top partner particles predicted by the Littlest Higgs Model with T-parity at the LHC, demonstrating how to measure their properties and test the model's dark matter predictions.

Contribution

It provides a detailed analysis of top partner production at the LHC, including methods to distinguish signals from backgrounds and measure model parameters, enabling tests of the LHT and dark matter scenarios.

Findings

Top partner signals can be distinguished from backgrounds.

Mass and mixing parameters can be measured with good accuracy.

The scenario where A_H is dark matter can be tested.

Abstract

In the framework of the littlest Higgs model with T-parity (LHT), we study the production processes of T-even (T_+) and T-odd (T_-) partners of the top quark at the Large Hadron Collider (LHC). We show that the signal events can be distinguished from the standard-model backgrounds, and that information about mass and mixing parameters of the top partners can be measured with relatively good accuracies. With the measurements of these parameters, we show that a non-trivial test of the LHT can be performed. We also discuss a possibility to reconstruct the thermal relic density of the lightest T-odd particle A_H using the LHC results, and show that the scenario where A_H becomes dark matter may be checked.