Matrix Elements of Electroweak Penguin Operators in the 1/Nc Expansion

Simple item page
dc.creatorKnecht, M.
dc.creatorPeris, S.
dc.creatorde Rafael, E.
dc.date1998-12-22
dc.date1999-04-08
dc.date.accessioned2026-07-07T11:35:36Z
dc.date.available2026-07-07T11:35:36Z
dc.descriptionIt is shown that the K -> pi pi matrix elements of the four-quark operator Q_7, generated by the electroweak penguin-like diagrams of the Standard Model, can be calculated to first non-trivial order in the chiral expansion and in the 1/Nc expansion. Although the resulting B factors B_7^(1/2) and B_7^(3/2) are found to depend only logarithmically on the matching scale, mu, their actual numerical values turn out to be rather sensitive to the precise choice of mu in the GeV region. We compare our results to recent numerical evaluations from lattice-QCD and to other model estimates.
dc.description10 pages, LateX, two figures (inserted). Improved comparison with the lattice results. Results unchanged
dc.identifierhttps://arxiv.org/abs/hep-ph/9812471
dc.identifierhttp://arxiv.org/abs/hep-ph/9812471
dc.identifierPhys.Lett.B457:227-235,1999
dc.identifierdoi:10.1016/S0370-2693(99)00425-6
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/198644
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Lattice
dc.titleMatrix Elements of Electroweak Penguin Operators in the 1/Nc Expansion
dc.typetext

Files

Collections

arXiv