期刊
PHYSICS LETTERS B
卷 783, 期 -, 页码 263-267出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2018.06.062
关键词
Parton distribution amplitudes; Proton structure; Nonperturbative methods in quantum field theory; Dynamical chiral symmetry breaking; Light-front quantum field theory
资金
- Argonne National Laboratory, Office of the Director's Postdoctoral Fellowship Program
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant [665919]
- Spanish MINECO's Juan de la Cierva-Incorporacion programme [IJCI-2016-30028]
- Spanish Ministerio de Economia, Industria y Competitividad [FPA2014-55613-P, SEV-2016-0588]
- Chinese Government's Thousand Talents Plan for Young Professionals
- Chinese Ministry of Education, under the International Distinguished Professor programme
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-AC02-06CH11357]
Constrained by solutions of the continuum three-valence-body bound-state equations, we use perturbation theory integral representations (PTIRs) to develop algebraic Ansatze for the Faddeev wave functions of the proton and its first radial excitation, delivering therewith a quantum field theory calculation of the pointwise behaviour of their leading-twist parton distribution amplitudes (PDAs). The proton's PDA is a broad, concave function, with its maximum shifted relative to the peak in QCD's conformal limit expression for this PDA. The size and direction of this shift signal the presence of both scalar and pseudovector diquark correlations in the nucleon, with the scalar generating around 60% of the proton's normalisation. The radial-excitation is constituted similarly, and the pointwise form of its PDA, which is negative on a material domain, is the result of marked interferences between the contributions from both types of diquark; particularly, the locus of zeros that highlights its character as a radial excitation. These features originate with the emergent phenomenon of dynamical chiral-symmetry breaking in the Standard Model. (c) 2018 Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP(3).
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