Abstract

We will present preliminary results of (i) iso-vector vector/axial-vector form factors of the nucleon and also (ii) hyperon beta decay, in quenched lattice calculation with domain wall fermions. First of all, we discuss about finite volume effect on semi-leptonic decay form factors, especially for neutron beta decay. Later we report our new attempt to investigate the SU(3) breaking effect on hyperon beta decay. We are especially interested in Xi^0 -> Sigma^+ decay channel, which is the direct analogue of neutron beta decay under an exchange between down quark and strange quark.

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