Precise Determination of |V{us}| from Lattice Calculations of Pseudoscalar Decay Constants

Abstract

Combining the ratio of experimental kaon and pion decay widths, Gamma(K to mu antineutrino{mu} (gamma)) / Gamma(pi to mu \antineutrino (gamma)), with a recent lattice gauge theory calculation of f{K}/f{pi} provides a precise value for the CKM quark mixing matrix element |V{us}|=0.2236(30) or if 3 generation unitarity is assumed |V{us}|=0.2238(30). Comparison with other determinations of that fundamental parameter, implications, and an outlook for future improvements are given.

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• Order p^6 chiral couplings from the scalar K Pi form factor
• A Determination of the CKM Parameter |Vus|
• Actions for dynamical fermion simulations: are we ready to go?

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