We present the first results for the K-l3 form factor from simulations with 2+1 flavors of dynamical domain wall quarks. Combining our result, namely, f(+)(0)=0.964(5) with the latest experimental results for K-l3 decays leads to vertical bar V-us vertical bar=0.2249(14), reducing the uncertaintity in this important parameter. For the O(p(6)) term in the chiral expansion we obtain Delta f=-0.013(5).
|Number of pages||4|
|Journal||Physical Review Letters|
|Publication status||Published - 11 Apr 2008|
- CHIRAL FERMIONS