Updated preliminary lattice QCD result for f_+(0) and |V_us| from PACS10 ensembles at three lattice spacings, consistent with other determinations and about 2 sigma from CKM unitarity.
Kl3 semileptonic form factor from 2+1 flavour lattice QCD
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abstract
We present the first results for the Kl3 form factor from simulations with 2+1 flavours of dynamical domain wall quarks. Combining our result, namely f_+(0)=0.964(5), with the latest experimental results for Kl3 decays leads to |V_{us}|=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).
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Update of kaon semileptonic form factor using $N_f=2+1$ PACS10 configurations
Updated preliminary lattice QCD result for f_+(0) and |V_us| from PACS10 ensembles at three lattice spacings, consistent with other determinations and about 2 sigma from CKM unitarity.