Proceedings of XXIX International Symposium on Lattice Field Theory — PoS(Lattice 2011) 2012
DOI: 10.22323/1.139.0164
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Quark and glue momenta and angular momentum in the nucleon

Abstract: We report a complete calculation of the quark and glue momenta and angular momenta in the proton. These include the quark contributions from both the connected and disconnected insertions. The calculation is carried out on a 16 3 × 24 quenched lattice at β = 6.0 and for Wilson fermions with κ = 0.154, 0.155, and 0.1555 which correspond to pion masses at 650, 538, and 478 MeV. The quark loops are calculated with Z 4 noise and signal-to-noise is improved further with unbiased subtractions. The glue operator is c… Show more

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Cited by 6 publications
(4 citation statements)
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“…While the computations concerning the quark distribution functions are approaching a satisfactory situation, the case of the gluon contributions is much less advanced. In fact, presently only a few quenched results for the gluon momentum fraction (GMF) exist 1 [10,11,12,13]. This is a rather unfortunate situation since the analysis of phenomenological parton distribution functions data [14] suggests that at a scale of 6.25 GeV 2 for instance, all the quarks only contribute a fraction of about 60 percent to the total nucleon momentum.…”
Section: Introductionmentioning
confidence: 99%
“…While the computations concerning the quark distribution functions are approaching a satisfactory situation, the case of the gluon contributions is much less advanced. In fact, presently only a few quenched results for the gluon momentum fraction (GMF) exist 1 [10,11,12,13]. This is a rather unfortunate situation since the analysis of phenomenological parton distribution functions data [14] suggests that at a scale of 6.25 GeV 2 for instance, all the quarks only contribute a fraction of about 60 percent to the total nucleon momentum.…”
Section: Introductionmentioning
confidence: 99%
“…Measurements of the sea quark orbital angular momentum (L q ) remain largely unexplored, as current SIDIS data have poor sensitivity to the sea quarks. However, Lattice QCD calculations which predict the observed L q ≈ 0, also predict up to 50% of the nucleon's spin to come from L q [7,8]. In addition to this theoretical prediction, indirect hints of a large non-zero L q have been observed.…”
Section: Introductionmentioning
confidence: 93%
“…The first complete calculation of the quark and glue momenta and angular momenta in the proton in the gauge invariant formulation (Eq. 2) was achieved in the quenched approximation with Wilson fermion [71,81]. The dynamical fermion calculation with N f = 2 was done with twisted mass fermion [41].…”
Section: Quark and Glue Momentum And Angular Momentum Fractions In Th...mentioning
confidence: 99%