Parton distributions of light quarks and antiquarks in the proton

Lei Chang; Fei Gao; Craig D. Roberts

doi:10.1016/j.physletb.2022.137078

Parton distributions of light quarks and antiquarks in the proton

Lei Chang, Fei Gao, Craig D. Roberts^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

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 light-front momentum fractions carried by all identifiable parton classes are the same; on the other hand, the higher moments are different. Understanding these features may provide insights that explain distinctions between Nambu-Goldstone bosons and seemingly less complex hadrons.

Original language	English
Article number	137078
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	829
DOIs	https://doi.org/10.1016/j.physletb.2022.137078
Publication status	Published - 10 Jun 2022
Externally published	Yes

Keywords

Continuum Schwinger function methods
Emergence of mass
Nonperturbative quantum field theory
Parton distributions
Proton structure
Strong interactions in the standard model of particle physics

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10.1016/j.physletb.2022.137078

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abstract = "An algebraic Ansatz for the proton's Poincar{\'e}-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 light-front momentum fractions carried by all identifiable parton classes are the same; on the other hand, the higher moments are different. Understanding these features may provide insights that explain distinctions between Nambu-Goldstone bosons and seemingly less complex hadrons.",

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T1 - Parton distributions of light quarks and antiquarks in the proton

AU - Chang, Lei

AU - Gao, Fei

AU - Roberts, Craig D.

PY - 2022/6/10

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N2 - 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 light-front momentum fractions carried by all identifiable parton classes are the same; on the other hand, the higher moments are different. Understanding these features may provide insights that explain distinctions between Nambu-Goldstone bosons and seemingly less complex hadrons.

AB - 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 light-front momentum fractions carried by all identifiable parton classes are the same; on the other hand, the higher moments are different. Understanding these features may provide insights that explain distinctions between Nambu-Goldstone bosons and seemingly less complex hadrons.

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KW - Emergence of mass

KW - Nonperturbative quantum field theory

KW - Parton distributions

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KW - Strong interactions in the standard model of particle physics

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Parton distributions of light quarks and antiquarks in the proton

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