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arXiv · 0905.0951

Improved bounds on the radius and curvature of the K pi scalar form factor and implications to low-energy theorems

Gauhar Abbas·B. Ananthanarayan
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Abstract

We obtain stringent bounds in the < r^2 >_S^{K pi}-c plane where these are the scalar radius and the curvature parameters of the scalar pi K form factor respectively using analyticity and dispersion relation constraints, the knowledge of the form factor from the well-known Callan-Treiman point m_K^2-m_pi^2, as well as at m_pi^2-m_K^2 which we call the second Callan-Treiman point. The central values of these parameters from a recent determination are accomodated in the allowed region provided the higher loop corrections to the value of the form factor at the second Callan-Treiman point reduce the one-loop result by about 3% with F_K/F_pi=1.21. Such a variation in magnitude at the second Callan-Treiman point yields 0.12 fm^2 \lesssim < r^2>_S^{K pi} \lesssim 0.21 fm^2 and 0.56 GeV^{-4} \lesssim c \lesssim 1.47 GeV^{-4} and a strong correlation between them. A smaller value of F_K/F_pi shifts both bounds to lower values.

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Gauhar Abbas, B. Ananthanarayan. 2009-05-07. Improved bounds on the radius and curvature of the K pi scalar form factor and implications to low-energy theorems. https://doi.org/10.1140/epja%2Fi2009-10801-y

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