PRECISE MEASURING MASS AND SPIN OF DARK MATTER PARTICLES AT ILC VIA SINGULARITIES IN THE SINGLE LEPTON ENERGY SPECTRUM

摘要

We consider models in which stability of Dark Matter particles D is ensured by the conservation of the new quantum number, called D-parity here. Our models contain also charged D-odd particle D~±. We propose method for precision measuring masses and spin of D-particles via the study of energy distribution of single lepton (e or μ) in the process e~+e~- → D~+D~- → DDW~+W~- with the observable state dijet + μ (or e) + nothing. It is shown that this distribution has kinematically determined singular points (upper edge and kinks or peak). Measuring of their positions allow one to determine precisely masses of D and D~±. After this, even a rough measuring of corresponding cross section allows one to determine the spin of D particles.