Long distance contribution to KL → ℓ+ℓ−

Long Distance Contribution to KL → ℓ + ℓ −

We revisit the calculation of the long distance contribution to K L → µ + µ −. We discuss this process within the framework of chiral perturbation theory, and also using simple models for the K L γ * γ * ver-tex. We argue that it is unlikely that this mode can be used to extract information on short distance parameters.

Comments on long distance contribution to K + → π + νν̄

The Long Distance Contribution to D → πl + l −

We calculate the long distance contribution to D +,0 → π +,0 l + l − decays by the use of a vector meson dominance model, in which the φ-meson plays the central role. The branching ratios obtained are 10 −6 and a few times 10 −7 for the resonance and non-resonance regions respectively. The analysis includes a calculation of D + → π + φ, consistent with the experimental value.

Long distance contribution to B − → K − K − π + , - a searching ground mode for new physics

The decay B − → K − K − π + has been sugested as a test for minimal su-persymmetric standard model and for supersymmetric models with R-parity violating couplings, in view of its extreme smallness in the standard model. We calculate two long distance contributions to this decay, that associated with DD and Dπ intermediate states and that induced by virtual D, π mesons. The branching ratio due t...

Long distance contribution to K + → π + νν̄ decay and O ( p 4 ) terms in CHPT