Chiral Extrapolation of the Strangeness Changing K pi Form Factor

Details Chiral Extrapolation of the Strangeness Changing K pi Form Factor Chiral Extrapolation of the Strangeness Changing K pi Form Factor

2009-12-18

arxiv.org/abs/0912.3792v2

JHEP 1004:001,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

few minor changes

Scientific paper

10.1007/JHEP04(2010)001

We perform a chiral extrapolation of lattice data on the scalar K pi form factor and the ratio of the kaon and pion decay constants within Chiral Perturbation Theory to two loops. We determine the value of the scalar form factor at zero momentum transfer, at the Callan-Treiman point and at its soft kaon analog as well as its slope. Results are in good agreement with their determination from experiment using the standard couplings of quarks to the W boson. The slope is however rather large. A study of the convergence of the chiral expansion is also performed.

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