Variational approach to the calculation of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msub><mml:mrow><mml:mi>g</mml:mi></mml:mrow><mml:mrow><mml:mi>A</mml:mi></mml:mrow></mml:msub></mml:math>

Owen, B. J.; Dragos, Jack; Kamleh, Waseem; Leinweber, Derek B.; Mahbub, M. Selim; Menadue, Benjamin J.; Zanotti, J. M.

doi:10.1016/j.physletb.2013.04.063

Cited by 47 publications

(57 citation statements)

References 27 publications

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“…For this reasons, g A is an optimal benchmark quantity for hadron structure computations, and it is essential for LQCD to reproduce its experimental value or if a deviation is observed to understand its origin. [12,13], RBC/UKQCD [14], χQCD [15]), N f =2+1 DWF on asqtad sea (LHPC [16]), N f =2 TMF (ETMC [17]), N f =2 Clover (QCDSF/UKQCD [18], CLS/MAINZ [19], QCDSF [20], RQCD [21]), N f =2+1 Clover (LHPC [22], CSSM [23]), N f =2+1+1 TMF (ETMC [24]), N f =2+1+1 HISQ (PNDME [25,26]), N f =2 TMF with Clover (ETMC [27]). The asterisk is the experimental value [28].…”

Section: Axial Chargementioning

confidence: 99%

Recent progress in hadron structure from Lattice QCD

Constantinou¹

2016

Proceedings of the 8th International Workshop on Chiral Dynamics — PoS(CD15)

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We review recent progress in hadron structure using lattice QCD simulations, with main focus in the evaluation of nucleon quantities such as the axial and tensor charges, and the spin content of the nucleon, using simulations at pion masses close to the physical value. We highlight developments on the evaluation of the gluon moment, a new direct approach to compute quark parton distributions functions on the lattice, as well as, the neutron electric dipole moment. A discussion of the systematic uncertainties and the computation of the disconnected contributions using dynamical simulations is also included.

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Section: Axial Chargementioning

confidence: 99%

Recent progress in hadron structure from Lattice QCD

Constantinou¹

2016

Proceedings of the 8th International Workshop on Chiral Dynamics — PoS(CD15)

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“…The best approach for isolating a state within a tower of states excited by a particular interpolating field is to introduce differently sized covariantly smeared sources and sinks [21][22][23]. Physical hadrons are extended objects, and a linear combination of Gaussian sources allows one to approximate the hadronic wave function [24].…”

Section: A Correlation Functions and The Variational Approachmentioning

confidence: 99%

Instanton contributions to the low-lying hadron mass spectrum

2015

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The role of instanton-like objects in the QCD vacuum on the mass spectrum of low-lying light hadrons is explored in lattice QCD. Using over-improved stout-link smearing, tuned to preserve instanton-like objects in the QCD vacuum, the evolution of the mass spectrum under smearing is examined. The calculation is performed using a 20 3 ×40 dynamical fat-link-irrelevant-clover (FLIC) fermion action ensemble with lattice spacing 0.126 fm. Through the consideration of a range of pion masses, the effect of the vacuum instanton content is compared at a common pion mass. While the qualitative features of ground-state hadrons are preserved on instantondominated configurations, the excitation spectrum experiences significant changes. The underlying physics revealed shows little similarity to the direct-instanton interaction predictions of the instanton liquid model.

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“…Most attempts have resulted in values ∼10% below the experimental number for the axial-vector coupling [1][2][3][4][5][6][7][8], while a few claim that their results could be consistent with experiment [9][10][11][12]. For the quark momentum fraction x u−d , overestimation by ∼20 -30% is common in most of the calculations [3,7,[13][14][15] except [8].…”

Section: Introductionmentioning

confidence: 99%

Stochastic method with low mode substitution for nucleon isovector matrix elements

et al. 2016

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We introduce a stochastic method with low-mode substitution to evaluate the connected threepoint functions. The isovector matrix elements of the nucleon for the axial-vector coupling g 3 A , scalar couplings g 3 S and the quark momentum fraction x u−d are calculated with overlap fermion on 2+1 flavor domain-wall configurations on a 24 3 ×64 lattice at mπ = 330 MeV with lattice spacing a = 0.114 fm.

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Variational approach to the calculation of gA

Cited by 47 publications

References 27 publications

Recent progress in hadron structure from Lattice QCD

Recent progress in hadron structure from Lattice QCD

Instanton contributions to the low-lying hadron mass spectrum

Stochastic method with low mode substitution for nucleon isovector matrix elements

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