Chargino mass determination at a muon collider

Abstract

We analyze the prospects at a muon collider for measuring chargino masses in the ${\mu }^{+}{\mu }^{-}\to {\tilde{\chi }}^{+}{\tilde{\chi }}^{-}$ process in the threshold region. We find that for the lighter chargino of a mass $100-200$ GeV, a measurement better than $50-300$ MeV should be possible with 50 fb${}^{-1}$ integrated luminosity. The accuracy obtained here is better than with other techniques or at other facilities. The muon sneutrino mass, which enters through the ${\tilde{\nu }}_{\mu }$ exchange diagram, can also be simultaneously measured to a few GeV if it is not too heavy.

13 pages, 3 figures

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• Radiative Corrections to Chargino Production in Electron-Positron Collisions with Polarised Beams
• Development of a Frictional Cooling Demonstration experiment