The intrinsic gluon component of the nucleon

Hoyer, Paul; Roy, D.

doi:10.1016/s0370-2693(97)00893-9

Cited by 13 publications

(7 citation statements)

References 16 publications

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“…To describe partons inside hadrons, the light-cone presentation is a natural language [20]. In the light-cone Fock-state language of bound states [21,22,23], the hadronic eigenstate of QCD Hamiltonian is expanded on the complete set of color-singlet quark-gluon eigenstates,…”

Section: Introductionmentioning

confidence: 99%

Sea quark contents of octet baryons

Shao

Zhang

2010

Physics Letters B

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The flavor asymmetry of the nucleon sea, i.e., the excess of $d\bar{d}$ quark-antiquark pairs over $u\bar{u}$ ones in the proton can be explained by several different models; therefore, it is a challenge to discriminate these models from each other. We examine in this Letter three models: the balance model, the meson cloud model, and the chiral quark model, and we show that these models give quite different predictions on the sea quark contents of other octet baryons. New experiments aimed at measuring the flavor contents of other octet baryons are needed for a more profound understanding of the non-perturbative properties of quantum chromodynamics (QCD).Comment: 15 pages, 2 figures, version in final publicatio

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Section: Introductionmentioning

confidence: 99%

Sea quark contents of octet baryons

Shao

Zhang

2010

Physics Letters B

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“…To perform the singlet DGLAP evolution needed in this case we take a gluon distribution of the form g(x) = N g x −1 (1 − x) 3[47,48] and use our results for the gluon momentum fraction to constraint N g .…”

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Distinguishing Quarks and Gluons in Pion and Kaon Parton Distribution Functions

2020

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The leading-twist parton distribution functions of the pion and kaon are calculated for the first time using a rainbow-ladder truncation of QCD's Dyson-Schwinger equations (DSEs) that self-consistently sums all planar diagrams. The non-perturbative gluon dressing of the quarks is thereby correctly accounted for, which in practice means solving the inhomogeneous Bethe-Salpeter equation (BSE) for the quark operator that defines the spin-independent quark distribution functions. An immediate consequence of using this dressed vertex is that gluons carry 35% of the pion's and 30% of the kaon's light-cone momentum, with the remaining momentum carried by the quarks. The scale associated with these DSE results is µ 0 = 0.78 GeV. The gluon effects generated by the inhomogeneous BSE are inherently non-perturbative and cannot be mimicked by the perturbative QCD evolution equations. A key consequence of this gluon dressing is that the valence quarks have reduced support at low-to-intermediate x, where the gluons dominate, and increased support at large x. As a result, our DSE calculation of the pion's valence quark distribution is in excellent agreement with the Conway et al. pion-induced Drell-Yan data, but nevertheless exhibits the q π (x) (1 − x) 2 behavior as x → 1 predicted by perturbative QCD.

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“…[12] is rather simple: while sea quarkantiquark pairs are produced flavor blindly by gluon splitting, ū quarks have larger probability to annihilate than d quarks due to the fact that there are more u quarks than d quarks in the proton, which hence causes the asymmetry. Taking proton as an ensemble of quark-gluon Fock states [13,14] and using the principle of detailed balance for transitions between various Fock states through creation or annihilation of partons, the probabilities ρ i,j,k of finding the quark-gluon Fock states |{uud}{i, j, k} have been obtained and given in Table 2 of Ref. [12], with i, j, k the number of ūu pairs, the number of dd pairs, the number of gluons, respectively.…”

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confidence: 99%