Effects of non-perturbatively improved dynamical fermions in QCD at fixed lattice spacing

Abstract

We present results for the static inter-quark potential, lightest glueballs, light hadron spectrum and topological susceptibility using a non-perturbatively improved action on a $16^3\times 32$ lattice at a set of values of the bare gauge coupling and bare dynamical quark mass chosen to keep the lattice size fixed in physical units ($\sim 1.7$ fm). By comparing these measurements with a matched quenched ensemble, we study the effects due to two degenerate flavours of dynamical quarks. With the greater control over residual lattice spacing effects which these methods afford, we find some evidence of charge screening and some minor effects on the light hadron spectrum over the range of quark masses studied ($M_{PS}/M_V\ge 0.58$). More substantial differences between quenched and unquenched simulations are observed in measurements of topological quantities.

53 pages, LaTeX/RevTeX, 16 eps figures; corrected clover action expression and various typos, no results changed

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• The nucleon mass in N_f=2 lattice QCD: finite size effects from chiral perturbation theory
• Speeding up Lattice QCD simulations with clover-improved Wilson Fermions
• Light hadron spectroscopy with two flavors of $O(a)$-improved dynamical quarks
• Non-perturbative Heavy Quark Effective Theory
• Quark helicity flip generalized parton distributions from two-flavor lattice QCD
• A Determination of the Lambda Parameter from Full Lattice QCD
• The spectrum of D_s mesons from lattice QCD
• Quenched spectroscopy with fixed-point and chirally improved fermions
• Axial coupling constant of the nucleon for two flavours of dynamical quarks in finite and infinite volume
• QCD with light Wilson quarks on fine lattices (I): first experiences and physics results
• The pion form factor from lattice QCD with two dynamical flavours
• Hybrid meson decay from the lattice
• Non-perturbative renormalization of the axial current with dynamical Wilson fermions
• A lattice study of the masses of singlet 0++ mesons
• Properties of light scalar mesons from lattice QCD
• Hadronic decay of a vector meson from the lattice
• Hadron Spectroscopy with Dynamical Chirally Improved Fermions
• Light meson radial Regge trajectories
• Excited B mesons from the lattice
• Octet Baryon Masses in Partially Quenched Chiral Perturbation Theory
• Decuplet Baryon Masses in Partially Quenched Chiral Perturbation Theory
• Non-perturbative improvement of the axial current for dynamical Wilson fermions
• Glueball mass measurements from improved staggered fermion simulations
• Negative-parity baryon spectra in quenched anisotropic lattice QCD
• A Numerical Study of Partially Twisted Boundary Conditions
• In Search of the Chiral Regime
• Investigation of the Second Moment of the Nucleon's g1 and g2 Structure Functions in Two-Flavor Lattice QCD
• The decay constant of the first excited pion from lattice QCD
• Influence of quark boundary conditions on the pion mass in finite volume
• Finite-Size Effects in Lattice QCD with Dynamical Wilson Fermions
• Improved Wilson QCD simulations with light quark masses
• Determination of Light and Strange Quark Masses from Full Lattice QCD
• Dynamics of Monopoles and Flux Tubes in Two-Flavor Dynamical QCD
• Topological susceptibility with the improved Asqtad action
• Convergence of the chiral expansion for the nucleon mass
• Light hadron spectroscopy in two-flavor QCD with small sea quark masses
• Estimating the Unquenched Strange Quark Mass from the Lattice Axial Ward Identity
• Finite Temperature QCD with Two Flavors of Non-perturbatively Improved Wilson Fermions
• Non-perturbative O(a)-improvement of Wilson quark action in three-flavor QCD with plaquette gauge action
• Chiral symmetry and pi-pi scattering in the Covariant Spectator Theory
• Generalized parton distributions and transversity from full lattice QCD
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• Bulk first-order phase transition in three-flavor lattice QCD with $O(a)$-improved Wilson fermion action at zero temperature
• An estimate of the flavour singlet contributions to the hyperfine splitting in charmonium
• Generalized parton distributions and structure functions from full lattice QCD
• Methods for Pseudoscalar Flavour-Singlet Mesons with Staggered Fermions
• Hadronic decay of a scalar B meson from the lattice
• Axial and tensor charge of the nucleon with dynamical fermions
• Decay constants of P-wave heavy-light mesons from unquenched lattice QCD
• Partially quenched chiral perturbation theory and numerical simulations
• Energies of B_s meson excited states - a lattice study
• Sea quark effects in B_K from N_f=2 clover-improved Wilson fermions
• Lattice status of gluonia/glueballs
• An unquenched lattice QCD calculation of the mass of the bottom quark
• M_pi^2 versus m_q: comparing CP-PACS and UKQCD data to Chiral Perturbation Theory
• Impact of large cutoff-effects on algorithms for improved Wilson fermions
• Second moment of the pion's distribution amplitude
• Determination of Lambda in quenched and full QCD - an update
• Nucleon structure from generalized parton distributions in lattice QCD
• One- and two-photon resonant spectroscopy of hydrogen and anti-hydrogen atoms in external electric fields
• Improved Perturbation Theory for Improved Lattice Actions
• Lattice QCD with mixed actions
• Chiral extrapolation and physical insights
• Two-loop additive mass renormalization with clover fermions and Symanzik improved gluons
• Thermodynamics and heavy quark potential in N_f=2 dynamical QCD
• Probing Nucleon Structure on the Lattice
• Searching for chiral logs in the static-light decay constant
• A nonperturbative determination of the O(a) improvement coefficient c_A and the scaling of f_pi and m^{MSbar}
• Finite temperature phase transition in lattice QCD with N_f=2 nonperturbatively improved Wilson fermions at N_t=8
• An Exact Algorithm for Any-flavor Lattice QCD with Kogut-Susskind Fermion
• Discretisation effects in the topological susceptibility in lattice QCD
• Excitations of the nucleon with dynamical fermions
• Quark mass dependence of nucleon mass and axial-vector coupling constant
• Excited States in Staggered Meson Propagators
• Determining the strange quark mass for 2-flavour QCD
• Hadron Spectrum from Dynamical Lattice QCD Simulations
• Baryons from the lattice: past, present and future
• A lattice Dirac operator for QCD with light dynamical quarks
• Cutoff-effects in the spectrum of dynamical Wilson fermions
• Spatial string tension in $N_f=2$ lattice QCD at finite temperature
• Nucleon Form Factors: Probing the Chiral Limit
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• Partially Twisted Boundary Conditions in Lattice Simulations
• Baryons on the lattice
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• The effect of sea quarks on the mass of the charm quark from Lattice QCD
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