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Kaon semileptonic decay form factors with Nf = 2 non-perturbatively O(a)-improved Wilson fermions

Presenter: Sergey Morozov — Institute for Theoretical and Experimental Physics

QCDSF collaboration

We present first results from the QCDSF collaboration for the kaon semileptonic decay form factors at zero momentum transfer using two flavours of non-perturbatively O(a)-improved Wilson quarks. A lattice determination of these form factors is of particular interest to improve the accuracy on the CKM matrix element |Vus|. Calculations are performed on lattices with lattice spacing down to 0.08 fm with different values of light and strange quark masses which allows us to extrapolate to chiral limit. Employing double ratio techniques we are able to get small statistical errors.