New Dipole Penguin Contribution to K --> pi pi decays
High Energy Physics - Phenomenology
2008-11-26 v2
Abstract
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.
Keywords
Cite
@article{arxiv.0803.2106,
title = {New Dipole Penguin Contribution to K --> pi pi decays},
author = {Jan O. Eeg and Kresimir Kumericki and Ivica Picek},
journal= {arXiv preprint arXiv:0803.2106},
year = {2008}
}
Comments
17 pages, 1 PS figure, LaTeX, corresponds to published version