Dowdall, R.J., Davies, C.T.H. , Horgan, R.R., Lepage, G.P., McNeile, C., Monahan, C.J. and Shigemitsu, J. (2013) B, Bs, K and pi weak matrix elements with physical light quarks. In: 31st International Symposium on Lattice Field Theory LATTICE 2013, Mainz, Germany, 29 Jul – 3 Aug 2013,
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Abstract
Calculations of pseudoscalar decay constants of B, Bs, K and pi mesons with physical light quarks are presented. We use HISQ ensembles that include u,d,s and c sea quarks at three lattice spacings. HISQ is used for the valence light quarks and a radiatively improved NRQCD action for the heavy quarks. The key results are f_{B^+}=0.184(4)$ GeV, f_{B_s}=0.224(4) GeV, f_{B_s}/f_{B^+}=1.217(8), f_{K^+}/f_{pi^+}=1.1916(21), f_{K^+}=155.37(34) MeV, giving a significant improvement over previous results that required chiral extrapolation. We also calculate the Wilson flow scale w_0, finding w_0=0.1715(9) fm.
| Item Type: | Conference Proceedings |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | McNeile, Dr Craig and Dowdall, Dr Rachel and Shigemitsu, Prof Junko and Davies, Professor Christine |
| Authors: | Dowdall, R.J., Davies, C.T.H., Horgan, R.R., Lepage, G.P., McNeile, C., Monahan, C.J., and Shigemitsu, J. |
| College/School: | College of Science and Engineering > School of Physics and Astronomy |
| Copyright Holders: | Copyright © 2013 The Authors |
| Publisher Policy: | Reproduced under a Creative Commons License |
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