New Dipole Penguin Contribution to K --> pi pi decays

Details New Dipole Penguin Contribution to K --> pi pi decays New Dipole Penguin Contribution to K --> pi pi decays

2008-03-14

arxiv.org/abs/0803.2106v2

Phys.Lett.B669:150-155,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 1 PS figure, LaTeX, corresponds to published version

Scientific paper

10.1016/j.physletb.2008.09.039

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 Q_6 operator. Accordingly, this new operator enlarges by ~ 5 % the referent Q_6 contribution, which gives the dominant contribution to the CP-violating ratio epsilon'/epsilon and also gives an important contribution to the Delta I = 1/2 amplitude.

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