The Light Hadron Spectrum and Decay Constants in Quenched Lattice QCD

Abstract

We present results for light hadrons composed of both degenerate and non-degenerate quarks in quenched lattice QCD. We calculate masses and decay constants using 60 gauge configurations with an $O(a)$--improved fermion action at $\beta =6.2$. Using the $\rho$ mass to set the scale, we find hadron masses within two to three standard deviations of the experimental values (given in parentheses): $m_{K^*}=868\er{9}{8}$~MeV (892~MeV), $m_ϕ=970\err{20}{10}$~MeV (1020~MeV), $m_N=820\err{90}{60}$~MeV (938~MeV), $m_Δ=1300\errr{100}{100}$~MeV (1232~MeV) and $m_Ω=1650\err{70}{50}$~MeV (1672~MeV). Direct comparison with experiment for decay constants is obscured by uncertainty in current renormalisations. However, for ratios of decay constants we obtain $f_K/f_π=1.20\er{3}{2}$ (1.22) and $f_ϕ/f_ρ=1.13\er{2}{3}$ (1.22).

27 pages, LaTeX, epsf, 11 figs (appended as 21 postscript files, uuencoded), to appear in Phys Rev D, Edinburgh Preprint: 93/524, Southampton Preprint SHEP 92/93-16

References in corpus (6)

• Gauge-Invariant Smearing and Matrix Correlators using Wilson Fermions at beta=6.2
• Hadron Mass Predictions of the Valence Approximation to Lattice QCD
• Quenched Light Hadron Mass Spectrum and Decay Constants: the effects of $O(a)$-Improvement at $\beta =6.2$
• Quenched Hadrons using Wilson and O(a)-Improved Fermion Actions at beta=6.2
• Contamination of Excited States in Quenched QCD Hadron Propagators
• Meson Decay Constant Predictions of the Valence Approximation to Lattice QCD

Cited by in corpus (43)

• Non-perturbative O(a) improvement of lattice QCD
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• Light Hadron Masses from Lattice QCD
• Effects of non-perturbatively improved dynamical fermions in QCD at fixed lattice spacing
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• Lattice-Constrained Unitarity Bounds for ${\bar{B}}^0\to {\pi }^{+}{l}^{-}{\bar{\nu }}_l$ Decays
• Light Quenched Hadron Spectrum and Decay Constants on different Lattices
• Heavy Baryon Specroscopy from the Lattice
• Light hadron spectroscopy with O(a) improved dynamical fermions
• Form Factors for B -> pi l nu-bar_l and B -> K* gamma Decays on the Lattice
• Quark Masses from Lattice QCD at the Next-to-Leading Order
• Effective Chiral Lagrangians and Lattice QCD
• Lattice Study of the Decay B^0-bar -> rho^+ l^- nu_l-bar: Model-Independent Determination of |V_{ub}|
• Quenched QCD with O(a) improvement: I. The spectrum of light hadrons
• Quenched Heavy-Light Decay Constants
• Fitting Correlated Hadron Mass Spectrum Data
• The Isgur-Wise Function from the Lattice
• Hadron masses and matrix elements from the QCD Schr"odinger functional
• The eta and eta' mesons in QCD
• Efficient Hadronic Operators in Lattice Gauge Theory
• Is the Quenched Spectrum in agreement with Experiment?
• An ``Improved" Lattice Study of Semi-leptonic Decays of D-Mesons
• Heavy Quark Spectroscopy and Matrix Elements: A Lattice Study using the Static Approximation
• Implementation of Symanzik's Improvement Program for Simulations of Dynamical Wilson Fermions in Lattice QCD
• First Lattice Calculation of The B-meson Binding and Kinetic Energies
• Lattice Study of Semi-Leptonic $B$ Decays: I. $\bar{B}\to D\ell \bar{\nu }$ Decays
• Leptonic Decays of Heavy Quarks on the Lattice
• A High Statistics Lattice Calculation of $f_B^{static}$ at $\beta =6.2$ Using the Clover Action
• $B\to K^{\ast }\gamma$: Penguins on the Lattice
• Hadron Masses and Decay Constants with Wilson Quarks at $\beta =5.85$ and 6.0
• The effect of tree-level and mean-field improvement on the light-hadron spectrum in quenched QCD
• Quark-hadron duality and hadron properties from correlators of pseudoscalar and axial currents
• Light hadron masses with a tadpole-improved next-nearest-neighbour lattice fermion action
• Current Renormalisation Constants with an O(a)-improved Fermion Action
• Study of Lattice Correlation Functions at Small Times using the QCD Sum Rules Continuum Model
• Probing with Penguins: A lattice calculation of the branching ratio for some of the exclusive modes of $b\to s\gamma$
• Geometrical Volume Effects in the Computation of the Slope of the Isgur-Wise Function
• The QCD Spectrum
• First Lattice Study of the Form Factors A_0 and A_3 in the Decay Bbar^0 to rho^+ l^- nubar_l
• Light vector meson decay constants and the renormalization factor from a tadpole-improved action
• Hadron widths in mixed-phase matter
• Measuring hadron properties at finite temperature
• Light Quenched Hadron Spectrum and Decay Constants on different Lattices