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We present the results of the first two-loop calculation of a form factor infull $SU(3) \times SU(3)$ Chiral Perturbation Theory. We choose a specificlinear combination of $\pi^+, K^+, K^0$ and $K\pi$ form factors (the oneappearing in Sirlin's theorem) which does not get contributions from order$p^6$ operators with unknown constants. For the charge radii, the correction tothe previous one-loop result turns out to be significant, but still there is noagreement with the present data due to large experimental uncertainties in thekaon charge radii.Comment: 6 pages, Latex, 2 LaTeX figure

physical review letters

Higher-Order Corrections to Sirlin's Theorem in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="bold-script">O</mml:mi><mml:mo>(</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">p</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mo>)</mml:mo></mml:math>Chiral Perturbation Theory

Higher-Order Corrections to Sirlin's Theorem inO(p6)Chiral Perturbation Theory