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We point out that the standard chromomagnetic penguin dipole operator has a counterpart corresponding to off-shell momenta for external quarks. By employing the chiral quark model, we show that this new dipole penguin operator has the same bosonisation as the standard Q6 operator. Accordingly, this new operator enlarges by ∼5% the referent Q6 contribution, which gives the dominant contribution to...
We analyse the structure of long distance (LD) contributions to the CP-violating parameter ϵK, that generally affect both the absorptive (Γ12) and the dispersive (M12) parts of the K0–K¯0 mixing amplitude. We point out that, in a consistent framework, in addition to LD contributions to ImΓ12, estimated recently by two of us, also LD contributions to ImM12 have to be taken into account. Estimating...
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