Kaon semileptonic decays near the physical point

2012/12/13 by Peter A. Boyle, Boyle, Peter A., Jonathan M. Flynn +9
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #hep-lat

paper · pdf · doi:10.48550/arxiv.1212.3188

7 pages, 7 figures, Lattice 2012 PoS

arxiv created 2012/12/13 · arxiv updated 2012/12/14

Abstract

The CKM matrix element |V_us| can be extracted from the experimental measurement of semileptonic K→π decays. The determination depends on theory input for the corresponding vector form factor in QCD. We present a preliminary update on our efforts to compute it in N_f=2+1 lattice QCD using domain wall fermions for several lattice spacings and with a lightest pion mass of about 170 MeV. By using partially twisted boundary conditions we avoid systematic errors associated with an interpolation of the form factor in momentum-transfer, while simulated pion masses near the physical point reduce the systematic error due to the chiral extrapolation.

Related

• Momentum dependence of kaon semileptonic form factors with Nf=2+1+1 Twisted Mass fermions
• K -> pi vector form factor with N_f=2+1+1 Twisted Mass fermions
• The kaon semileptonic form factor in Nf=2+1 domain wall lattice QCD with physical light quark masses
• Kaon semileptonic decays with N_f=2+1+1 HISQ fermions and physical light-quark masses
• |V_us| from K decays in theory