Constraining the properties of K_{l3} form factors with analyticity and unitarity

Details Constraining the properties of K_{l3} form factors with analyticity and unitarity Constraining the properties of K_{l3} form factors with analyticity and unitarity

2011-12-19

arxiv.org/abs/1112.4270v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages latex, PoS style files, talk given at RADCOR 2011, Mamallapuram, India, 26 - 30 September, 2011; replaced with v2 whic

Scientific paper

Bounds on the shape parameters of K_{l3} form factors are investigated in a general model independent framework. Using the method of unitarity bounds for correlators evaluated in pQCD, chiral symmetry and experimental information on the phase and modulus of \pi K form factors up to an energy t_{in}=1 GeV^2, we constrain the shape parameters of the scalar and vector form factors, the value of the scalar form factor at t=M_\pi^2-M_K^2, and exclude regions where zeros can exist on the real energy line and in the complex energy plane.

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