Sneutrino cascade decays image as a probe of chargino spin properties and CP violation Original Research Article

The decays image, image, when kinematically allowed, constitute a source of 100% polarised charginos. We study the process image, with subsequent chargino decays image, image or their charge conjugate image, image. The kinematics of this process allows the reconstruction of the sneutrino and chargino rest frames, and thus a clean analysis of the angular distributions of the visible final state products in these reference systems. Furthermore, a triple product CP asymmetry can be built in image hadronic decays, involving the chargino spins and the momenta of the quark and antiquark. With a good c tagging efficiency, this CP asymmetry is quite sensitive to the phase of the bino mass term image and can test CP violation in the neutralino sector.