CP violation flavor asymmetries in slepton pair production at leptonic colliders from broken R parity

Abstract

We examine the effect of the R parity odd renormalizable interactions on flavor non-diagonal rates and CP violation asymmetries in the production of slepton pairs at $e^- - e^+$ leptonic colliders, for center of mass energies spanning the interval from the Z-boson pole up to 1000 GeV. The lepton number violating interactions, associated with the lepton number violating coupling constants, are assumed to incorporate CP odd complex phases. The flavor changing rates are controlled by tree level amplitudes and quadratic products of different R parity violating coupling constants and the CP asymmetries by interference terms between tree and loop level amplitudes and quartic products. The consideration of loop amplitudes is restricted to the photon and Z-boson vertex corrections. We present numerical results using a family and species independent mass parameter, $\tilde m$, for all the scalar superpartners and making simple assumptions for the family dependence of the R parity odd coupling constants. The flavor non-diagonal rates, $\s_{JJ'}$, vary in the range, $(ł/0.1)^4 2 - 20$ fbarns, as one spans the interval of center of mass energies from the Z-boson pole up to 1000 GeV. For sleptons masses, $\tilde m> 150 $ GeV, these observables could be of use at NLC energies to set useful bounds on the R parity odd coupling constants. The values of the asymmetries, vary from a few to a few tens of $10^{-3}$.