Dresden 2013 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 22: Gittereichtheorie
T 22.2: Vortrag
Montag, 4. März 2013, 17:00–17:15, WIL-C129
Kaon semileptonic form factor from 2+1 flavor Lattice-QCD — •Alessio Burello and Enno Scholz — Universität Regensburg
We compute the scalar form factor at zero momentum transfer f0 (0) for the kaon to pion semileptonic decay (kℓ3) on the lattice. Such a quantity is of interest because it is a major source of uncertainty in the determination of the Vus entry of the electroweak mixing (CKM) matrix. Ultimately, one is interested in checking whether the determined values are compatible with the unitarity of the CKM matrix. The form factor can be determined building suitable ratios of two and three point functions. To reach zero momentum transfer the use of the recently developed technique of the partially twisted boundary conditions is applied. We are using the Nf=2+1 SLinC fermion action with pion masses in the range 210-400 MeV and lattice spacing a ≈ 0.08fm. In this talk we will describe the methodology and present some preliminary results.