Penguin and Box Diagrams in Unitary Gauge

Details Penguin and Box Diagrams in Unitary Gauge Penguin and Box Diagrams in Unitary Gauge

2009-09-20

arxiv.org/abs/0909.3638v1

Eur.Phys.J.C64:681-687,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 2 figures, to appear in EPJC

Scientific paper

10.1140/epjc/s10052-009-1162-4

We evaluate one-loop diagrams in the unitary gauge that contribute to flavor-changing neutral current (FCNC) transitions involving two and four fermions. Specifically, we deal with penguin and box diagrams arising within the standard model (SM) and in nonrenormalizable extensions thereof with anomalous couplings of the W boson to quarks. We show explicitly in the SM the subtle cancelation among divergences from individual unitary-gauge contributions to some of the physical FCNC amplitudes and derive expressions consistent with those obtained using R_xi gauges in the literature. Some of our results can be used more generally in certain models involving fermions and gauge bosons which have interactions similar in form to those we consider.

Affiliated with

Also associated with

No associations

Rating

Penguin and Box Diagrams in Unitary Gauge does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Penguin and Box Diagrams in Unitary Gauge, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Penguin and Box Diagrams in Unitary Gauge will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-296329