English

Comment on `Analysis of O(p^2) Corrections to <2pi|Q_{7,8}|K>'

High Energy Physics - Phenomenology 2009-11-07 v3 High Energy Physics - Lattice

Abstract

We extend in several respects our earlier work on O(p^2) corrections to matrix elements of the electroweak penguin operator O_{ewp}. First, to facilitate comparison with certain lattice studies we calculate O(p^2) corrections to <pi|O_{ewp}|K> in the SU(3) limit of equal light quark masses. Next, we demonstrate how an apparent disagreement in the literature regarding whether higher order chiral contributions increase or decrease <2pi_{I=2}|O_{ewp}|K> is simply a consequence of how the leading order chiral amplitude is defined. Finally, we address an aspect of the epsilon'/epsilon problem by estimating O(p^2) corrections to recent determinations of <2pi_{I=2}|Q_{7,8}|K> which were carried out in the chiral limit.

Keywords

Cite

@article{arxiv.hep-ph/0109265,
  title  = {Comment on `Analysis of O(p^2) Corrections to <2pi|Q_{7,8}|K>'},
  author = {Vincenzo Cirigliano and Eugene Golowich},
  journal= {arXiv preprint arXiv:hep-ph/0109265},
  year   = {2009}
}

Comments

6 pages, Reference added and typo corrected