scholarly journals The decay constants fD and f D s $$ {f}_{D_s} $$ in the continuum limit of Nf = 2 + 1 domain wall lattice QCD

2017 ◽  
Vol 2017 (12) ◽  
Author(s):  
P.A. Boyle ◽  
◽  
L. Del Debbio ◽  
A. Jüttner ◽  
A. Khamseh ◽  
...  
Keyword(s):  
Domain Wall ◽  
Lattice Qcd ◽  
Continuum Limit ◽  
Decay Constants ◽  
The Continuum

scholarly journals Heavy–light decay constants in the continuum limit of quenched lattice QCD

2003 ◽  
Vol 672 (1-2) ◽  
pp. 372-386 ◽  
Author(s):  
G.M. de Divitiis ◽  
M. Guagnelli ◽  
F. Palombi ◽  
R. Petronzio ◽  
N. Tantalo
Keyword(s):  
Lattice Qcd ◽  
Continuum Limit ◽  
Decay Constants ◽  
The Continuum

scholarly journals Charm sea effects on charmonium decay constants and heavy meson masses

2021 ◽  
Vol 81 (8) ◽  
Author(s):  
Salvatore Calì ◽  
Kevin Eckert ◽  
Jochen Heitger ◽  
Francesco Knechtli ◽  
Tomasz Korzec
Keyword(s):  
Lattice Qcd ◽  
Continuum Limit ◽  
Charm Quark ◽  
Heavy Meson ◽  
Charm Quarks ◽  
Decay Constants ◽  
Derivatives Of ◽  
Charm Mass ◽  
The Continuum

AbstractWe estimate the effects on the decay constants of charmonium and on heavy meson masses due to the charm quark in the sea. Our goal is to understand whether for these quantities $${N_\mathrm{f}}=2+1$$ N f = 2 + 1 lattice QCD simulations provide results that can be compared with experiments or whether $${N_\mathrm{f}}=2+1+1$$ N f = 2 + 1 + 1 QCD including the charm quark in the sea needs to be simulated. We consider two theories, $${N_\mathrm{f}}=0$$ N f = 0 QCD and QCD with $${N_\mathrm{f}}=2$$ N f = 2 charm quarks in the sea. The charm sea effects (due to two charm quarks) are estimated comparing the results obtained in these two theories, after matching them and taking the continuum limit. The absence of light quarks allows us to simulate the $${N_\mathrm{f}}=2$$ N f = 2 theory at lattice spacings down to 0.023 fm that are crucial for reliable continuum extrapolations. We find that sea charm quark effects are below 1% for the decay constants of charmonium. Our results show that decoupling of charm works well up to energies of about 500 MeV. We also compute the derivatives of the decay constants and meson masses with respect to the charm mass. For these quantities we again do not see a significant dynamical charm quark effect, albeit with a lower precision. For mesons made of a charm quark and a heavy antiquark, whose mass is twice that of the charm quark, sea effects are only about 1‰ in the ratio of vector to pseudoscalar masses.

scholarly journals Leptonic Decays of Heavy Quarks on the Lattice

1997 ◽  
Vol 12 (25) ◽  
pp. 4477-4538 ◽  
Author(s):  
Hartmut Wittig
Keyword(s):  
Cp Violation ◽  
Continuum Limit ◽  
Systematic Errors ◽  
Decay Constants ◽  
Leptonic Decays ◽  
The Standard Model ◽  
Lattice Calculations ◽  
The Status ◽  
Lattice Approach ◽  
The Continuum

The status of lattice calculations of heavy-light decay constants and of the B parameter BB is reviewed. After describing the lattice approach to heavy quark systems, the main results are discussed, with special emphasis on the systematic errors in present lattice calculations. A detailed analysis of the continuum limit for decay constants is performed. The implications of lattice results on studies of CP violation in the Standard Model are discussed.

scholarly journals Flavor singlet meson mass in the continuum limit in two-flavor lattice QCD

2003 ◽  
Vol 67 (7) ◽  
Author(s):  
V. I. Lesk ◽  
S. Aoki ◽  
R. Burkhalter ◽  
M. Fukugita ◽  
K.-I. Ishikawa ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Continuum Limit ◽  
Meson Mass ◽  
The Continuum

scholarly journals Lattice QCD calculation of the proton decay matrix element in the continuum limit

2004 ◽  
Vol 70 (11) ◽  
Author(s):  
N. Tsutsui ◽  
S. Aoki ◽  
M. Fukugita ◽  
S. Hashimoto ◽  
K-I. Ishikawa ◽  
...  
Keyword(s):  
Matrix Element ◽  
Lattice Qcd ◽  
Continuum Limit ◽  
Proton Decay ◽  
The Continuum ◽  
Decay Matrix Element

scholarly journals The continuum limit of the quark mass step scaling function in quenched lattice QCD

2004 ◽  
Vol 2004 (05) ◽  
pp. 001-001 ◽  
Author(s):  
M Guagnelli ◽  
J Heitger ◽  
F Palombi ◽  
C Pena ◽  
A Vladikas
Keyword(s):  
Lattice Qcd ◽  
Quark Mass ◽  
Continuum Limit ◽  
Scaling Function ◽  
The Continuum

scholarly journals The scalar radius of the pion from lattice QCD in the continuum limit

2015 ◽  
Vol 51 (12) ◽  
Author(s):  
Vera Gülpers ◽  
Georg von Hippel ◽  
Hartmut Wittig
Keyword(s):  
Lattice Qcd ◽  
Continuum Limit ◽  
The Continuum

scholarly journals ABELIAN PROJECTION AND STUDIES OF GAUGE-VARIANT QUANTITIES IN THE LATTICE QCD WITHOUT GAUGE FIXING

1996 ◽  
Vol 11 (13) ◽  
pp. 1081-1093 ◽  
Author(s):  
SERGEI V. SHABANOV
Keyword(s):  
Lattice Qcd ◽  
Continuum Limit ◽  
Gluon Propagator ◽  
Lorentz Invariance ◽  
Gauge Condition ◽  
Gauge Fields ◽  
Gauge Invariant ◽  
Dynamical Reduction ◽  
Gauge Fixing ◽  
The Continuum

We suggest a new (dynamical) Abelian projection of the lattice QCD. It contains no gauge condition imposed on gauge fields so that Gribov copying is avoided. Configurations of gauge fields that turn into monopoles in the Abelian projection can be classified in a gauge-invariant way. In the continuum limit, the theory respects the Lorentz invariance. A similar dynamical reduction of the gauge symmetry is proposed for studies of gauge-variant correlators (like a gluon propagator) in the lattice QCD. Though the procedure is harder for numerical simulations, it is free of gauge-fixing artifacts, like the Gribov horizon and copies.

THE CHIRAL U(1) SYMMETRY IN LATTICE QCD WITH WILSON FERMIONS

1995 ◽  
Vol 10 (15) ◽  
pp. 2269-2290 ◽  
Author(s):  
CARLO UNGARELLI
Keyword(s):  
Lattice Qcd ◽  
Chiral Symmetry ◽  
Continuum Limit ◽  
Axial Current ◽  
Numerical Results ◽  
Ward Identities ◽  
Definition Of ◽  
The Continuum ◽  
Wilson Fermions

The properties of singlet flavor chiral symmetry of lattice QCD with Wilson fermions are analyzed. We show that a suitable U(1) axial current can be defined, satisfying, in the continuum limit, the Adler-Bell-Jackiw anomaly. Moreover, the renormalization properties of composite operators which appear in U(1) chiral Ward identities are discussed. Finally, starting from the renormalized Ward identities for the axial U(1) current, we analyze a definition of topological susceptibility suitable for nonperturbative studies and discuss preliminary numerical results.

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