PT Journal
AU Bernard, V
   Passemar, E
TI Chiral extrapolation of the strangeness changing scalar K pi form factor
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2010
BP 001
EP 18pp
VL 04
IS 4
DI 10.1007/JHEP04(2010)001
LA English
DE Lattice QCD; Chiral Lagrangians
AB 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.
ER