Stringent constraints on the scalar K pi form factor from analyticity, unitarity and low-energy theorems

Details Stringent constraints on the scalar K pi form factor from analyticity, unitarity and low-energy theorems Stringent constraints on the scalar K pi form factor from analyticity, unitarity and low-energy theorems

2009-12-15

arxiv.org/abs/0912.2831v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages latex, uses EPJ style files, 3 figures, replaced with version accepted by EPJA

Scientific paper

We investigate the scalar K pi form factor at low energies by the method of unitarity bounds adapted so as to include information on the phase and modulus along the elastic region of the unitarity cut. Using at input the values of the form factor at t=0 and the Callan-Treiman point, we obtain stringent constraints on the slope and curvature parameters of the Taylor expansion at the origin. Also, we predict a quite narrow range for the higher order ChPT corrections at the second Callan-Treiman point.

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