Vus from π and K decay constants in full lattice QCD with physical u, d, s, and c quarks

Dowdall, R.J., Davies, C.T.H. , Lepage, G.P. and McNeile, C. (2013) Vus from π and K decay constants in full lattice QCD with physical u, d, s, and c quarks. Physical Review D, 88(7), 074504. (doi: 10.1103/PhysRevD.88.074504)

Full text not currently available from Enlighten.

Publisher's URL: http://dx.doi.org/10.1103/PhysRevD.88.074504

Abstract

We determine the decay constants of the π and K mesons on gluon field configurations from the MILC Collaboration including <i>u</i>, <i>d</i>, <i>s</i>, and <i>c</i> quarks. We use three values of the lattice spacing and <i>u/d</i> quark masses going down to the physical value. We use the w0 parameter to fix the relative lattice spacing and fπ to fix the overall scale. This allows us to obtain a value for fK+/fπ+=1.1916(21). Comparing to the ratio of experimental leptonic decay rates gives |Vus|=0.22564(28)Br(K+)(20)EM(40)latt(5)Vud and the test of unitarity of the first row of the Cabibbo-Kobayashi-Maskawa matrix: |Vud|2+|Vus|2+|Vub|2−1=0.000 09(51).

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:McNeile, Dr Craig and Davies, Professor Christine
Authors: Dowdall, R.J., Davies, C.T.H., Lepage, G.P., and McNeile, C.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review D
Publisher:American Physical Society
ISSN:1550-7998
ISSN (Online):1550-2368

University Staff: Request a correction | Enlighten Editors: Update this record

Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
481951Investigations in Quantum Chromodynamics and Physics Beyond the Standard ModelChristine DaviesScience & Technologies Facilities Council (STFC)ST/G00059X/1P&A - PHYSICS & ASTRONOMY
462271Precision results for particle physics from lattice QCD: Computing resources and software support for the UKQCD physics programme.Christine DaviesScience & Technologies Facilities Council (STFC)ST/H00887X/1P&A - PHYSICS & ASTRONOMY
573721Phenomenology from Lattice QCD and Collider PhysicsChristine DaviesScience & Technologies Facilities Council (STFC)ST/J000442/1P&A - PHYSICS & ASTRONOMY