الفهرس | Only 14 pages are availabe for public view |
Abstract Supersymmetry (SUSY) is one of the most interesting candidates for physics beyond the standard model. SUSY provides solutions for many problems in the standard model. We studied the charge conjugation parity (CP) violation in the leptonic (τ ) and mesonic(B) decay processes. The semi-leptonic |S| = 1 τ - decays, in particular τ → Kπν, was studied within the framework of SUSY for two variants: With and without R-parity conservation. • With R-parity conservation : (i) We derived the effective SUSY Hamiltonian (H) of the τ− → s¯uντ transition. SUSY contributions are generated through two topological box diagrams (that account for chargino, sleptons and squarks exchange). (ii) Complete expressions of Wilson coefficients (Ci, i = 1, ..., 5) of H at electroweak scale are derived and given in terms of several mass insertions that represent the flavor transitions between different generations of quarks and leptons. (iii) Computation of Wilson coefficients are carried out in the Mass Insertion Approximation (MIA) where gluino and neutralino are flavored diagonal. (iv) In a preliminary study of the SUSY effects on the CP violation in the threebody decay (τ− → K−π0ντ ), we analyzed all important constraints on the relevant mass insertions and that may be imposed on the SUSY contributions to the two-body decay (τ− → K−ντ ) (v) The total amplitude for τ− → K−π0ντ was derived and revealed the basic result that CP asymmetry depends on the relative ratios among SUSY Wilson coefficients. (vi) Different scenarios ( based on the relative ratios of Ci) are proposed for those giving the dominant SUSY contributions. (vii) We considered the interference of the Q5 operator (which is induced by SUSY contribution ) and the Q1 operator (which is dominated by the SM contribution). This leads to an enhancement of the predicted CP asymmetry with several orders of magnitudes than the standard model (SM) prediction. |