Discrimination of New Physics Models with the International Linear Collider

摘要

The large hadron collider (LHC) is anticipated to provide signals of newphysics at the TeV scale, which are likely to involve production of a WIMP darkmatter candidate. The international linear collider (ILC) is to sort out thesesignals and lead us to some viable model of the new physics at the TeV scale.In this article, we discuss how the ILC can discriminate new physics models,taking the following three examples: the inert Higgs model, the supersymmetricmodel, and the littlest Higgs model with T-parity. These models predict darkmatter particles with different spins, 0, 1/2, and 1, respectively, and hencecomprise representative scenarios. Specifically, we focus on the pairproduction process, e+e- -> chi+chi- -> chi0chi0W+W-, where chi0 and chi+- arethe WIMP dark matter and a new charged particle predicted in each of thesemodels. We then evaluate how accurately the properties of these new particlescan be determined at the ILC and demonstrate that the ILC is capable ofidentifying the spin of the new charged particle and discriminating thesemodels.