Hadron physics and lattice QCD

Alexandrou, C.

doi:10.1063/1.4826707

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…For t f ≥ 15a one can reasonably identify a plateau over several timeslices. The fit reproduces the data well, with reasonable values a ∼ 0.07 fm, m π ∼ 295 MeV, Lm π = 3.For ensemble IV (mπ ∼ 295 MeV), the combinationC3pt(t, t f )/(m0A0e −m 0 t f ) times the renormalization factor to give x MS u−d (2 GeV) for t f /a =7,9,11,13,15,17. A0e −m 0 t f corresponds to the ground state contribution to C2pt(t f ) obtained from a simultaneous fit to C3pt and C2pt for all t f .…”

mentioning

confidence: 53%

The moment⟨x⟩u−dof the nucleon fromNf
Bali
¹
,
Collins
²
,
Gläßle
³

et al. 2014
Phys. Rev. D
49
5
38
0
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We present an update of our analysis [1] which includes additional ensembles at different quark masses, lattice spacings and volumes, all with high statistics. We use N f ¼ 2 mass-degenerate quark flavors, employing the nonperturbatively improved clover action. The lattice matrix elements are converted to the MS scheme via renormalization factors determined nonperturbatively in the RI 0 -MOM scheme. We have systematically investigated excited state contributions, in particular, at the smallest, near physical, pion mass. While our results (with much increased precision) are consistent with Ref.[1], comparing to previous determinations we find that excited state contributions can be significant if the quark smearing is not suitably optimized, in agreement with other recent studies. The difference with respect to the value for hxi u−d extracted from experimental data is reduced but not resolved. Using lattice sizes in the range Lm π ∼ 3.4-6.7, no significant finite volume effects have been observed. Performing a controlled continuum limit that may remove the discrepancy will require simulations at lattice spacings a < 0.06 fm.

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mentioning

confidence: 53%

The moment⟨x⟩u−dof the nucleon fromNf
Bali
¹
,
Collins
²
,
Gläßle
³

et al. 2014
Phys. Rev. D
49
5
38
0
View full text Add to dashboard Cite

show abstract

“…g V and gT are frequently determined in calculations of the electromagnetic form factors [28,33,35,38,39,[41][42][43][44][45][46][47], also see Refs. [48][49][50][51][52] for recent reviews. Here we compute the complete set of isovector couplings down to a nearly physical quark mass.…”

Section: Introductionmentioning

confidence: 99%

Nucleon isovector couplings fromNf=2lattice QCD

et al. 2015

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We compute the axial, scalar, tensor and pseudoscalar isovector couplings of the nucleon as well as the induced tensor and pseudoscalar charges in lattice simulations with N f = 2 massdegenerate non-perturbatively improved Wilson-Sheikholeslami-Wohlert fermions. The simulations are carried out down to a pion mass of 150 MeV and linear spatial lattice extents of up to 4.6 fm at three different lattice spacings ranging from approximately 0.08 fm to 0.06 fm. Possible excited state contamination is carefully investigated and finite volume effects are studied. The couplings, determined at these lattice spacings, are extrapolated to the physical pion mass. In this limit we find agreement with experimental results, where these exist, with the exception of the magnetic moment. A proper continuum limit could not be performed, due to our limited range of lattice constants, but no significant lattice spacing dependence is detected. Upper limits on discretization effects are estimated and these dominate the error budget.

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“…refs. [1][2][3][4]. Examples include moments of generalized parton distribution functions, as well as form factors.…”

Section: Introductionmentioning

confidence: 99%

A stochastic method for computing hadronic matrix elements

Alexandrou

Constantinou

Dinter³

et al. 2014

Eur. Phys. J. C

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We present a stochastic method for the calculation of baryon three-point functions that is more versatile compared to the typically used sequential method. We analyze the scaling of the error of the stochastically evaluated three-point function with the lattice volume and find a favorable signal-tonoise ratio suggesting that our stochastic method can be used efficiently at large volumes to compute hadronic matrix elements.

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Hadron physics and lattice QCD

Abstract: Abstract. A review of recent lattice QCD hadron structure calculations is presented. Important hadronic properties such as the axial charge and spin content of the nucleon, as well as, the mass and axial charge of hyperons and charmed baryons are discussed.

Cited by 3 publications

References 25 publications

The moment⟨x⟩u−dof the nucleon fromNf
Bali
¹
,
Collins
²
,
Gläßle
³

et al. 2014
Phys. Rev. D
49
5
38
0
View full text Add to dashboard Cite

The moment⟨x⟩u−dof the nucleon fromNf
Bali
¹
,
Collins
²
,
Gläßle
³

et al. 2014
Phys. Rev. D
49
5
38
0
View full text Add to dashboard Cite

Nucleon isovector couplings fromNf=2lattice QCD

A stochastic method for computing hadronic matrix elements

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Hadron physics and lattice QCD

Abstract: Abstract. A review of recent lattice QCD hadron structure calculations is presented. Important hadronic properties such as the axial charge and spin content of the nucleon, as well as, the mass and axial charge of hyperons and charmed baryons are discussed.

Cited by 3 publications

References 25 publications

The moment⟨x⟩u−dof the nucleon fromNfBali1, Collins2, Gläßle3 et al. 2014Phys. Rev. D495380View full textAdd to dashboardCite

The moment⟨x⟩u−dof the nucleon fromNfBali1, Collins2, Gläßle3 et al. 2014Phys. Rev. D495380View full textAdd to dashboardCite

Nucleon isovector couplings fromNf=2lattice QCD

A stochastic method for computing hadronic matrix elements

Contact Info

Product

Resources

About

The moment⟨x⟩u−dof the nucleon fromNf
Bali
¹
,
Collins
²
,
Gläßle
³

et al. 2014
Phys. Rev. D
49
5
38
0
View full text Add to dashboard Cite

The moment⟨x⟩u−dof the nucleon fromNf
Bali
¹
,
Collins
²
,
Gläßle
³

et al. 2014
Phys. Rev. D
49
5
38
0
View full text Add to dashboard Cite