Corrections to Sirlin's Theorem in $O(p^6)$ Chiral Perturbation Theory

Details Corrections to Sirlin's Theorem in $O(p^6)$ Chiral Perturbation Theory Corrections to Sirlin's Theorem in $O(p^6)$ Chiral Perturbation Theory

1997-01-30

arxiv.org/abs/hep-ph/9701422v1

Phys.Rev.Lett. 79 (1997) 4088-4091

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, Latex, 2 LaTeX figures

Scientific paper

10.1103/PhysRevLett.79.4088

We present the results of the first two-loop calculation of a form factor in full $SU(3) \times SU(3)$ Chiral Perturbation Theory. We choose a specific linear combination of $\pi^+, K^+, K^0$ and $K\pi$ form factors (the one appearing in Sirlin's theorem) which does not get contributions from order $p^6$ operators with unknown constants. For the charge radii, the correction to the previous one-loop result turns out to be significant, but still there is no agreement with the present data due to large experimental uncertainties in the kaon charge radii.

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