The expansion by regions in pi K scattering

Details The expansion by regions in pi K scattering The expansion by regions in pi K scattering

2006-03-21

arxiv.org/abs/hep-ph/0603153v2

Journal of High Energy Physics 0606 (2006) 009

Physics

High Energy Physics

High Energy Physics - Phenomenology

Pion mass formula and references added. 20 pages, 5 figures

Scientific paper

10.1088/1126-6708/2006/06/009

We discuss a number of two loop (vertex) integrals relevant for pi K scattering at threshold. As such these are functions of two well separated mass scales, M\_pi/M\_K << 1. The method of regions allows an expansion in this mass ratio prior to the integration. In the cases considered, the coefficients in this expansion can be evaluated with elementary methods. As a first example of an application we present the leading strange quark contributions to the pion mass.

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