Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-07-11
Nucl.Phys. B599 (2001) 30-54
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages Latex with 8 figures, Typos corrected, one reference added
Scientific paper
10.1016/S0550-3213(00)00769-0
This paper describes the calculation of the electromagnetic form factor of the K0 meson at order p^6 of chiral perturbation theory which is the next-to-leading order correction to the well-known p^4 result achieved by Gasser and Leutwyler. On the one hand, at order p^6 the chiral expansion contains 1- and 2-loop diagrams which are discussed in detail. Especially, a numerical procedure for calculating the irreducible 2-loop graphs of the sunset topology is presented. On the other hand, the chiral Lagrangian L^6 produces a direct coupling of the K0 current with the electromagnetic field tensor. Due to this coupling one of the unknown parameters of L^6 occurs in the contribution to the K0 charge radius.
Post P.
Schilcher Karl
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