On the glueball spectrum in O(a)-improved lattice QCD

Abstract

We calculate the light `glueball' mass spectrum in N_f=2 lattice QCD using a fermion action that is non-perturbatively O(a) improved. We work at lattice spacings a ~0.1 fm and with quark masses that range down to about half the strange quark mass. We find the statistical errors to be moderate and under control on relatively small ensembles. We compare our mass spectrum to that of quenched QCD at the same value of a. Whilst the tensor mass is the same (within errors), the scalar mass is significantly smaller in the dynamical lattice theory, by a factor of ~(0.84 +/- 0.03). We discuss what the observed m_q dependence of this suppression tells us about the dynamics of glueballs in QCD. We also calculate the masses of flux tubes that wind around the spatial torus, and extract the string tension from these. As we decrease the quark mass we see a small but growing vacuum expectation value for the corresponding flux tube operators. This provides clear evidence for `string breaking' and for the (expected) breaking of the associated gauge centre symmetry by sea quarks.

33pp LaTeX. Version to appear in Phys. Rev. D

References in corpus (10)

• Static potentials and glueball masses from QCD simulations with Wilson sea quarks
• SU(N) gauge theories in four dimensions: exploring the approach to N = infinity
• Scalar Quarkonium Masses and Mixing with the Lightest Scalar Glueball
• Static correlation lengths in QCD at high temperatures and finite densities
• Scalar Glueball-qqbar Mixing above 1 GeV and implications for Lattice QCD
• Mixing of scalar glueballs and flavour-singlet scalar mesons
• The spectrum of the three-dimensional adjoint Higgs model and hot SU(2) gauge theory
• Determination of ${\Lambda }_{\overline{MS}}$ from quenched and $N_f=2$ dynamical QCD
• The glueball spectrum from novel improved actions
• Glueballs and Hybrids (Gluons as Constituents)

Cited by in corpus (54)

• QCD and strongly coupled gauge theories: challenges and perspectives
• From controversy to precision on the sigma meson: a review on the status of the non-ordinary $f_0(500)$ resonance
• The Status of Glueballs
• Towards the glueball spectrum from unquenched lattice QCD
• X(1835) as the Lowest Mass Pseudoscalar Glueball and Proton Spin Problem
• Direct instantons, topological charge screening and QCD glueball sum rules
• QCD Tests of the Puzzling Scalar Mesons
• Holographic glueball structure
• A lattice study of the masses of singlet 0++ mesons
• Gluon screening mass at finite temperature from Landau gauge gluon propagator in lattice QCD
• Glueball nature of the sigma/f_0(600) from pi-pi and gamma-gamma scatterings
• Glueball mass measurements from improved staggered fermion simulations
• The sigma and f_0(980) from Ke4 + pi-pi scatterings data
• Glueball spectrum from $N_f=2$ lattice QCD study on anisotropic lattices
• B decays into light scalar particles and glueball
• ${\eta }_c$ - glueball Mixing and Resonance X(1835)
• Anomalous dimensions and scalar glueball spectroscopy in AdS/QCD
• Baryonium, tetra-quark state and glue-ball in large N_c QCD
• $X(1835)$ and the New Resonances $X(2120)$ and $X(2370)$ Observed by the BES Collaboration
• Central exclusive diffractive production of $K^{+}{K}^{-}{K}^{+}{K}^{-}$ via the intermediate $\varphi \varphi$ state in proton-proton collisions
• Some properties of the newly observed X(1835) state at BES
• Light scalar mesons in QCD
• Scalar and Tensor Glueballs as Gravitons
• The scalar glueball spectrum
• Bulk first-order phase transition in three-flavor lattice QCD with $O(a)$-improved Wilson fermion action at zero temperature
• Methods for Pseudoscalar Flavour-Singlet Mesons with Staggered Fermions
• Lattice calculations of hadron properties
• Instanton and Higher-Loop Perturbative Contributions to the QCD Sum-Rule Analysis of Pseudoscalar Gluonium
• Glueball phenomenology and the relativistic flux tube model
• SO(N) gauge theories in 2+1 dimensions: glueball spectra and confinement
• Lattice status of gluonia/glueballs
• Nonlinear Regge trajectories and glueballs
• The possible members of the $5^1{S}_0$ meson nonet
• Proximity of $f_0(1500)$ and $f_0(1710)$ to the scalar glueball
• Generalized linear sigma model with two glueballs
• Spectroscopy From The Lattice: The Scalar Glueball
• Hard hadron spectroscopy
• Quark properties from the Hadron Resonance Gas
• The finite-width Laplace sum rules for $0^{++}$ scalar glueball in instanton liquid model
• Upper Limits on a Possible Gluon Mass
• Noise reduction algorithm for Glueball correlators
• "Glueballs": results and perspectives from the lattice
• Glueballs and vector mesons at NICA
• Discretisation effects in the topological susceptibility in lattice QCD
• Spinless mesons and glueballs mixing patterns in SU(3) flavor limit
• Gluon-Glueball Duality and Glueball Searches
• $2^{++}$ glueball
• Spectrum of Large N Glueballs: Holography vs Lattice
• eta - eta' - glueball mixing
• Gauge-invariant and infrared-improved variational analysis of the Yang-Mills vacuum wave functional
• ${\rm Y}(1s)\to \gamma f_2(1270)$ Decay
• Glueball relevant study on isoscalars from $N_f=2$ lattice QCD
• Beyond the quark model of hadrons from lattice QCD
• Precision dispersive approaches versus unitarized Chiral Perturbation Theory for the lightest scalar resonances $\sigma /f_0(500)$ and $\kappa /K_0^{\ast }(700)$