Long Distance Contribution to $K^+ \rightarrow π^+ ν\barν$

Details Long Distance Contribution to $K^+ \rightarrow π^+ ν\barν$ Long Distance Contribution to $K^+ \rightarrow π^+ ν\barν$

1994-01-03

arxiv.org/abs/hep-ph/9401204v1

Phys.Lett. B324 (1994) 461-464

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, uses phyzzx, 1 page of figures included

Scientific paper

10.1016/0370-2693(94)90223-2

We estimate the long distance contribution to the $K^+ \rightarrow \pi^+ \nu \bar\nu$ decay amplitude using chiral perturbation theory. We find that it is likely to be less than a few percent of the part of the short distance contribution proportional to the square of the charm quark mass. In the large $N_c$ limit the leading (in chiral perturbation theory) long distance contribution to $K^+ \rightarrow \pi^+ \nu \bar\nu$ from Feynman diagrams with a $W$ and $Z^0$ vanishes.

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