Recently we studied the B, Bs, D and Ds meson decay constants using various treatments for the heavy quark. For B mesons, we determined fB, fBs, and fBs/fB with NRQCD bottom quarks. We then combined the ratio fBs/fB and another very precise determination from HPQCD for fBs using heavy HISQ quarks, and extracted fB with 2% total errors. We also calculated fD, fDs, and fDs/fD using HISQ charm quarks. Here we review our results and briefly discuss their implications for the determination of the CKM matrix elements |Vcd| and |Vcs|.
@article{arxiv.1212.0586,
title = {Precise Determinations of the Decay Constants of B and D mesons},
author = {Heechang Na and Chris Monahan and Christine Davies and Eduardo Follana and Ron Horgan and Peter Lepage and Junko Shigemitsu},
journal= {arXiv preprint arXiv:1212.0586},
year = {2012}
}
Comments
7 pages, 4 figures, and 2 tables. Talk given at Lattice 2012, June 24-29, 2012, Cairns, Australia