Improved interpolating fields for hadrons at non-zero momentum

Morte, Michele Della; Jäger, Benjamin; Rae, Thomas; Wittig, Hartmut

doi:10.1140/epja/i2012-12139-9

Cited by 21 publications

(27 citation statements)

References 16 publications

(21 reference statements)

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“…We plan to corroborate our findings by including additional ensembles with smaller pion masses and extend our studies to other quantities, such as the vector and axial vector form factors of the nucleon. For this purpose, optimised anisotropic smearing functions for nonvanishing hadron momenta [34,35] may prove to be a useful addition to the technique of summed insertions.…”

Section: Discussionmentioning

confidence: 99%

Nucleon axial charge in lattice QCD with controlled errors

et al. 2012

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We report on our calculation of the nucleon axial charge gA in QCD with two flavours of dynamical quarks. A detailed investigation of systematic errors is performed, with a particular focus on contributions from excited states to three-point correlation functions. The use of summed operator insertions allows for a much better control over such contamination. After performing a chiral extrapolation to the physical pion mass, we find gA = 1.223 ± 0.063 (stat) +0.035 −0.060 (syst), in good agreement with the experimental value.

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Section: Discussionmentioning

confidence: 99%

Nucleon axial charge in lattice QCD with controlled errors

et al. 2012

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“…There are applications where lattice calculations require large hadron momenta, such as the semi-leptonic decays of heavy meson B → π ν and heavy baryon Λ b → p ν [12], and the large momentum approach to calculating TMD [13,14,15] and PDF [16]. In view of this, there have been several studies to address this issue on the lattice [17,18,19].…”

Section: Numeral Calculation On the Latticementioning

confidence: 99%

Parton Distribution Function from Hadronic Tensor

Liu¹

2016

Proceedings of the 33rd International Symposium on Lattice Field Theory — PoS(LATTICE 2015)

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The path-integral formulation of the hadronic tensor W µν of deep inelastic scattering is reviewed. It is shown that there are 3 gauge invariant and topologically distinct contributions. The separation of the connected sea partons from those of the disconnected sea can be achieved with a combination of the global fit of the parton distribution function (PDF), the semi-inclusive DIS data on the strange PDF and the lattice calculation of the ratio of the strange to u/d momentum fraction in the disconnected insertion.We shall discuss numerical issues associated with lattice calculation of the hadronic tensor involving a four-point function, such as large hadron momenta and improved maximum entropy method to obtain the spectral density from the hadronic tensor in Euclidean time.We also draw a comparison between the large momentum approach to the parton distribution function (PDF) and the hadronic tensor approach.

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“…This way, small Q 2 can be reached by increasing the energy difference between the source and the sink while keeping the spatial momentum transfer fixed to its minimum value. This strategy would likely require a nonstandard approach to the interpolating operators, since the usual smeared operators tend to have a poor signal and poor overlap with the ground state at large momentum [41][42][43]. 3.…”

Section: Electromagnetic Form Factorsmentioning

confidence: 99%

Hadron structure from lattice QCD

Green¹

2016

AIP Conference Proceedings

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Abstract. Recent progress in lattice QCD calculations of nucleon structure will be presented. Calculations of nucleon matrix elements and form factors have long been difficult to reconcile with experiment, but with advances in both methodology and computing resources, this situation is improving. Some calculations have produced agreement with experiment for key observables such as the axial charge and electromagnetic form factors, and the improved understanding of systematic errors will help to increase confidence in predictions of unmeasured quantities. The long-omitted disconnected contributions are now seeing considerable attention and some recent calculations of them will be discussed.

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Improved interpolating fields for hadrons at non-zero momentum

Cited by 21 publications

References 16 publications

Nucleon axial charge in lattice QCD with controlled errors

Nucleon axial charge in lattice QCD with controlled errors

Parton Distribution Function from Hadronic Tensor

Hadron structure from lattice QCD

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