Abstract

We present a calculation of $K \to \pi$ vector form factor in two-flavor QCD using domain-wall quarks and DBW2 glue. Simulations are carried out on a $16^3 \times 32 \times 12$ lattice at $a \simeq 0.12$~fm with sea quark masses in the range $m_s/2 \lesssim m_{\rm sea} \lesssim m_s$. We discuss sea quark effects on the form factor and compare our final result with previous phenomenological and lattice estimates.

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