The flavor-changing top-charm associated productions at ILC in littlest Higgs model with T parity

TL;DR

This paper investigates flavor-changing top-charm production at the ILC within the Littlest Higgs model with T parity, showing potential for detectable signals that inform mirror quark mass constraints.

Contribution

It explores the impact of flavor-changing couplings in the LHT model on top-charm production at the ILC, highlighting the sensitivity to mirror quark masses and potential for experimental detection.

Findings

Cross sections are sensitive to mirror quark masses.

Potentially detectable cross sections at the ILC.

Constraints on mirror quark masses can be derived.

Abstract

The littlest Higgs model with T-parity (LHT) has new flavor-changing (FC) couplings with the Standard Model (SM) quarks, which do not suffer strong constraints from electroweak precision data. So these FC interactions may enhance the cross sections of some flavor-changing neutral-current (FCNC) processes. In this work, we study the FC top-charm associated productions via $e^{-}\gamma$ collision at the ILC. We find that the cross sections are sensitive to the mirror quark masses. With reasonable values of the parameters, the cross sections may reach the detectable level and provide useful information about the relevant parameters in the LHT model, especially setting an upper limit on the mirror quark masses.