MEASUREMENT OF LITTLE HIGGS PARAMETERS AT INTERNATIONAL LINEAR COLLIDER

摘要

We investigate a possibility of precision measurements for parameters of the Littlest Higgs model with T-parity at the International Linear Collider (ILC). The model predicts new gauge bosons (A_H, Z_H, and W_H), among which the heavy photon (A_H) is a candidate for dark matter. The masses of these new gauge bosons strongly depend on the vacuum expectation value that breaks a global symmetry of the model. Through Monte Carlo simulations of the processes: e~+ e~- A_HZ_H and e~+e~- →W_H~+W_H~_,we show how precisely the masses can be determined at the ILC for a representative parameter point of the model. We also discuss the determination of the Little Higgs parameters and its impact on the future measurement of the thermal abundance of the dark matter relics in our universe.