B, Bs, K and pi weak matrix elements with physical light quarks

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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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
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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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
573721Phenomenology from Lattice QCD and Collider PhysicsChristine DaviesScience & Technologies Facilities Council (STFC)ST/J000442/1P&A - PHYSICS & ASTRONOMY