Abstract
In many models stability of dark matter particles D (with mass M D ) is ensured by a new conserved quantum number which we call the D-parity. We consider models which also contain charged D-odd particle D ± (with mass M ±). We study the process e + e − → D + D − followed by decay of D ± to D and gauge bosons W (either on-shell or off-shell). Measuring the end points of the energy distribution of W’s would determine M D and M ±. However, the hadron mode of W decay would lead to low precision in this measurement. while the information from the lepton mode looks incomplete. I show that it is sufficient to measure the energy distribution of a single lepton (for definiteness μ) in the process e + e − → μ + 2jets + large missing E T . The well identified singularities in this distribution allow for determination of M D and M ± with a high precision. After that, measuring the corresponding cross section will allow one to determine the spin of D particles.
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Ginzburg, I.F. Measuring of mass and spin of dark matter particles at ILC. Phys. Part. Nuclei Lett. 9, 678–685 (2012). https://doi.org/10.1134/S1547477112070059
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DOI: https://doi.org/10.1134/S1547477112070059