Valence quark ratio in the proton

Cui, Zhu-Fang; Gao, Fei; Binosi, Daniele; Chang, Lei; Roberts, Craig D.; Schmidt, Sebastian M.

doi:10.48550/arxiv.2108.11493

Cited by 4 publications

(5 citation statements)

References 54 publications

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“…Consistent with the analysis in Ref. [72], the calculated result agrees well with the data, which is thus seen to strongly disfavour a proton wave function that is based solely on scalar diquark correlations, i.e., excludes pseudovector diquarks.…”

supporting

confidence: 88%

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Parton distributions of light quarks and antiquarks in the proton

Chang,

Gao,

Roberts

2022

Preprint

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An algebraic Ansatz for the proton's Poincaré-covariant wave function, which includes both scalar and pseudovector diquark correlations, is used to calculate proton valence, sea, and glue distribution functions (DFs). Regarding contemporary data, a material pseudovector diquark component in the proton is necessary for an explanation of the neutron-proton structure function ratio; and a modest Pauli blocking effect in the gluon splitting function is sufficient to explain the proton's light-quark antimatter asymmetry. In comparison with pion DFs, the valence degrees-of-freedom in both proton and pion carry the same fraction of the host hadron's light-front momentum, but at a resolving scale typical of contemporary experiments, sea-quarks in the proton carry roughly 30% more momentum than their analogues in the pion and the proton glue fraction is 7% smaller. Understanding these differences may provide insights that explain distinctions between Nambu-Goldstone bosons and seemingly less complex hadrons.

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supporting

confidence: 88%

“…The r 10 range was chosen such that the band of values matches that extracted [72] from contemporary experiment [34,MARATHON] and data analyses [73]. The band in Eq.…”

mentioning

confidence: 99%

Parton distributions of light quarks and antiquarks in the proton

Chang,

Gao,

Roberts

2022

Preprint

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“…The ζ = ζ 3 prediction is drawn in Fig.4B: in comparison with modern data[69, MARATHON], it yields χ 2 /degree-of-freedom = 1.3. Notably, both data and calculation indicate the presence of a significant axial-vector diquark component in the proton wave function[83,84].…”

mentioning

confidence: 94%

Proton and pion distribution functions in counterpoint

Lu,

Chang,

Raya

et al. 2022

Preprint

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Working with proton and pion valence distribution functions (DFs) determined consistently at the same, unique hadron scale and exploiting the possibility that there is an effective charge which defines an evolution scheme for DFs that is all-orders exact, we obtain a unified body of predictions for all proton and pion DFs -valence, glue, and four-flavour-separated sea. Whilst the hadron light-front momentum fractions carried by identifiable parton classes are the same for the proton and pion at any scale, the pointwise behaviour of the DFs is strongly hadron-dependent. All calculated distributions comply with quantum chromodynamics constraints on low-and high-x scaling behaviour and, owing to emergent hadron mass, pion DFs are the most dilated. These results aid in elucidating the sources of similarities and differences between proton and pion structure.

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“…[33,34] and now often described as the statistical SPM, it has been honed in hadron physics applications, especially those which require interpolation and reliable extrapolation, e.g., Refs. [48][49][50][51][52][53][54]. The SPM builds form-unbiased interpolations of data as the foundation for well constrained extrapolations.…”

mentioning

confidence: 99%

Pauli Radius of the Proton

Cui¹,

Binosi²,

Roberts³

et al. 2021

Chinese Phys. Lett.

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Using a procedure based on interpolation via continued fractions supplemented by statistical sampling, we analyze proton magnetic form factor data obtained via electron+proton scattering on Q 2 ∈ [0.027, 0.55] GeV2 with the goal of determining the proton magnetic radius. The approach avoids assumptions about the function form used for data interpolation and ensuing extrapolation onto Q 2 ≃ 0 for extraction of the form factor slope. In this way, we find r M = 0.817(27) fm. Regarding the difference between proton electric and magnetic radii calculated in this way, extant data are seen to be compatible with the possibility that the slopes of the proton Dirac and Pauli form factors, F 1,2(Q 2), are not truly independent observables; to wit, the difference F ′ 1 ( 0 ) − F ′ 2 ( 0 ) / κ p = [ 1 + κ p ] / [ 4 m p 2 ] , viz., the proton Foldy term.

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Valence quark ratio in the proton

Cited by 4 publications

References 54 publications

Parton distributions of light quarks and antiquarks in the proton

Parton distributions of light quarks and antiquarks in the proton

Proton and pion distribution functions in counterpoint

Pauli Radius of the Proton

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