Abstract
We present the first lattice QCD calculation of the decay constants and with physical light quark masses. We use configurations generated by the MILC Collaboration including the effect of , , , and highly improved staggered quarks in the sea at three lattice spacings and with three quark mass values going down to the physical value. We use improved nonrelativistic QCD (NRQCD) for the valence quarks. Our results are , , , and , superseding earlier results with NRQCD quarks. We discuss the implications of our results for the standard model rates for and .
- Received 14 February 2013
DOI:https://doi.org/10.1103/PhysRevLett.110.222003
© 2013 American Physical Society