Leptonic decay-constant ratio fK/fπ from lattice QCD using 2+1 clover-improved fermion flavors with 2-HEX smearing
نویسندگان
چکیده
منابع مشابه
Leptonic-decay-constant ratio f(K+)/f(π+) from lattice QCD with physical light quarks.
A calculation of the ratio of leptonic decay constants f(K+)/f(π+) makes possible a precise determination of the ratio of Cabibbo-Kobayashi-Maskawa (CKM) matrix elements |V(us)|/|V(ud)| in the standard model, and places a stringent constraint on the scale of new physics that would lead to deviations from unitarity in the first row of the CKM matrix. We compute f(K+)/f(π+) numerically in unquenc...
متن کاملSpeeding up Lattice QCD simulations with clover-improved Wilson Fermions
We apply a recent proposal to speed up the Hybrid-Monte-Carlo simulation of systems with dynamical fermions to two flavour QCD with cloverimprovement. The basic idea of our proposal is to split the fermion matrix into two factors with a reduced condition number each. In the effective action, for both factors a pseudo-fermion field is introduced. For our smallest quark masses we see a speed-up o...
متن کاملB-meson decay constant from unquenched lattice QCD.
We present determinations of the -meson decay constant f(B) and f(B)(s)/f(B) using the MILC Collaboration unquenched gauge configurations, which include three flavors of light sea quarks. The mass of one of the sea quarks is kept around the strange quark mass, and we explore a range in masses for the two lighter sea quarks down to m(s)/8. The heavy quark is simulated using nonrelativistic QCD, ...
متن کاملLeptonic constant from B meson radiative decay
We propose a method to determine the leptonic decay constant fB∗ in the infinite heavy quark mass limit from the analysis of the radiative decay mode B− → lν̄lγ. The method relies on HQET symmetries and on experimental data from D∗0 → Dγ. E-mail address: [email protected] The measurement of fB and fB∗ , the leptonic decay constants of the B and B ∗ mesons, defined by the matrix elements: < ...
متن کاملHeavy-light decay constants using clover valence quarks and three flavors of dynamical improved staggered quarks
The MILC Collaboration: C. Bernard , S. Datta , C. DeTar , Steven Gottlieb , E.B. Gregory , U.M. Heller f , J. Osborn , R.L. Sugar g and D. Toussaint e Department of Physics, Washington University, St. Louis, MO 63130, USA Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany Physics Department, University of Utah, Salt Lake City, UT 84112, USA Department of Physics, Indiana Un...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review D
سال: 2017
ISSN: 2470-0010,2470-0029
DOI: 10.1103/physrevd.95.054513