Speaker
Eigo Shintani
(RIKEN-BNL)
Description
We discuss chiral and momentum extrapolation of the transition form factor of $\pi^0$ to two-photon using one-loop chiral perturbation theory (ChPT). Fitting the lattice data with the ChPT formula obtained for off-shell photons, we estimate low-energy constants that describe mass and momentum dependence of the $\pi^0$ to two-photon decay, which can be used to estimate the physical $\pi^0 -> \gamma \gamma$ amplitude.
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Primary author
Eigo Shintani
(RIKEN-BNL)
Co-authors
Dr
Norikazu Yamada
(KEK)
Dr
Shoji Hashimoto
(KEK)
Dr
Sinya Aoki
(Tsukuba University)
Dr
Tetsuya Onogi
(Osaka University)
