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The $Kpi$ form factors from Analyticity and Unitarity | Gauhar Abbas
; B.Ananthanarayan
; I.Caprini
; I.Sentitemsu Imsong
; | Date: |
24 Feb 2012 | Abstract: | Analyticity and unitarity techniques are employed to obtain bounds on the
shape parameters of the scalar and vector form factors of semileptonic $K_{l3}$
decays. For this purpose we use vector and scalar correlators evaluated in
pQCD, a low energy theorem for scalar form factor, lattice results for the
ratio of kaon and pion decay constants, chiral perturbation theory calculations
for the scalar form factor at the Callan-Treiman point and experimental
information on the phase and modulus of $Kpi $ form factors up to an energy
$ in=1 {
m GeV}^2$. We further derive regions on the real axis and in the
complex-energy plane where the form factors cannot have zeros. | Source: | arXiv, 1202.5399 | Services: | Forum | Review | PDF | Favorites |
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