Hadron masses from novel fat-link fermion actions

Zanotti, J. M.; Bilson-Thompson, Sundance; Bonnet, Frédéric; Coddington, P.D.; Leinweber, Derek B.; Williams, Anthony G.; Zhang, J. B.; Melnitchouk, Wally; Lee, Frank

doi:10.1103/physrevd.65.074507

Cited by 101 publications

(42 citation statements)

References 24 publications

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“…We use the FLIC fermion action [20] providing nonperturbative OðaÞ improvement [21] with improved chiral properties allowing efficient access to the light quark-mass regime [22].…”

Section: Resultsmentioning

confidence: 99%

SU(3)center vortices underpin confinement and dynamical chiral symmetry breaking

et al. 2012

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The mass function of the nonperturbative quark propagator in SU (3) gauge theory shows only a weak dependence on the vortex content of the gauge configurations. Of particular note is the survival of dynamical mass generation on vortex-free configurations having a vanishing string tension. This admits the possibility that mass generation associated with dynamical chiral symmetry breaking persists without confinement. In this paper we examine the low-lying ground state hadron spectrum of the π, ρ, N and ∆ and discover that while dynamical mass generation persists in the vortex-free theory, it is not connected to dynamical chiral symmetry breaking. In this way, centre vortices in SU (3) gauge theory are intimately linked to both confinement and dynamical chiral symmetry breaking.

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“…We use the FLIC fermion action [20] providing nonperturbative OðaÞ improvement [21] with improved chiral properties allowing efficient access to the light quark-mass regime [22].…”

Section: Resultsmentioning

confidence: 99%

SU(3)center vortices underpin confinement and dynamical chiral symmetry breaking

et al. 2012

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“…Robust methods have been developed that allow the isolation and study of the states associated with these resonances in lattice QCD [2,[10][11][12][13][14][15][16][17][18][19][20]. In this study, we apply the variational method [21,22] to extract the ground state and first three P 11 excited states of the proton associated with the Roper [3] and other higher energy P 11 states.…”

Section: Lattice Techniquesmentioning

confidence: 99%

Nucleon excited state wave functions from lattice QCD

2014

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3. The right to use all or part of the Article, including the APS-prepared version without revision or modification, on the author(s)' web home page or employer's website and to make copies of all or part of the Article, including the APS-prepared version without revision or modification, for the author(s)' and/or the employer's use for educational or research purposes." August 2016Nucleon excited state wave functions from lattice QCD We apply the eigenvectors from a variational analysis to successfully extract the three-quark colorsinglet wave functions of even-parity excited states of the nucleon. We explore the first four states in the spectrum excited by the standard nucleon interpolating field. We find that the states exhibit a structure qualitatively consistent with a constituent quark model, where the ground, first, second, and third excited states have 0, 1, 2, and 3 nodes in the radial wave function of the d quark about two u quarks at the origin. Moreover, the radial amplitude of the probability distribution is similar to that predicted by constituent quark models. We present a detailed examination of the quark-mass dependence of the probability distributions for these states, searching for a nontrivial role for the multiparticle components mixed in the finite-volume QCD eigenstates. Finally we examine the dependence of the d-quark probability distribution on the positions of the two u quarks. The results are fascinating, with the underlying S-wave orbitals governing the distributions even at rather large u-quark separations.

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“…An ingredient which has proven particularly useful in the design of fermion actions with small cutoff effects is link smearing, also known under the label of ''fat links'' [25][26][27][28][29][30]. In the quenched QCD tests reported below a single step of APE smearing [31] V ðxÞ U …”

Section: Specification Of Operator Details In 4dmentioning

confidence: 99%

Brillouin improvement for Wilson fermions

Dürr

Koutsou

2011

Phys. Rev. D

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We present a parameter-free Wilson-type lattice Dirac operator with an 81-point stencil for the covariant derivative and the Laplacian, which attempts to minimize the breaking of rotational symmetry near the boundary of the Brillouin zone. The usefulness of this ''Brillouin operator'' in practical applications is explored by studying the scaling of pseudoscalar decay constants in quenched QCD, with rather good results in the physical charm region. We also investigate the suitability of this operator as a kernel to the overlap procedure. Here, the resulting overlap operator is found to be cheaper to construct and significantly better localized than the variety with the standard Wilson kernel.

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Hadron masses from novel fat-link fermion actions

Cited by 101 publications

References 24 publications

SU(3)center vortices underpin confinement and dynamical chiral symmetry breaking

SU(3)center vortices underpin confinement and dynamical chiral symmetry breaking

Nucleon excited state wave functions from lattice QCD

Brillouin improvement for Wilson fermions

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