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)
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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 |
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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 |
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