Flavor Symmetry , K 0 - K̄ 0 Mixing and New Physics Effects on CP Violation in D ± and D ± s Decays

Flavor symmetry and symmetry breaking, K0-K̄0 mixing and possible effects of new physics on CP violation in weak decay modes D → KS,L+X , (KS,L+π )K∗+X ± (for X = π, ρ, a1) and D ± s → KS,L+X ± s , (KS,L+π )K∗ +X ± s (for Xs = K,K ) are analyzed. Relations between D and D s decay branching ratios are obtained from the d ⇔ s subgroup of SU(3) and dominant symmetry-breaking mechanisms are investigated. A CP asymmetry of magnitude 3.3 × 10−3 is shown to result in the standard model from K0-K̄0 mixing in the final-state. New physics affecting the doubly Cabibbo-suppressed channels might either cancel this asymmetry or enhance it up to the percent level. A comparison between the CP asymmetries in D (s) → KSX ± (s) and D ± (s) → KLX ± (s) can pin down effects of new physics. Electronic address: [email protected] Electronic address: [email protected]