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Proton quark distributions from a light-front Faddeev-Bethe-Salpeter approach

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Author(s):
Ydrefors, E. ; Frederico, T.
Total Authors: 2
Document type: Journal article
Source: Physics Letters B; v. 838, p. 7-pg., 2023-02-06.
Abstract

The projection onto the Light-Front of a Minkowski space Faddeev-Bethe-Salpeter equation model truncated at the valence level is applied to study the proton structure with constituent quarks. The dynamics of the model has built-in: (i) a bound diquark brought by a contact interaction, and (ii) the separation by - AQ C D of the infrared and ultraviolet interaction regions. The model parameters are fine tuned to reproduce the proton Dirac electromagnetic form factor and mass. From that, the non-polarized longitudinal and transverse momentum distributions were computed. The results for the evolved non -polarized valence parton distributions suggest that: (i) the explicit consideration of the spin degree of freedom of both quark and diquark seems not relevant to it, and (ii) the comparison with the global fit from the NNPDF4.0 calls for higher Fock components of the wave function beyond the valence one. (c) 2023 The Author(s). 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 SCOAP3. (AU)

FAPESP's process: 19/07767-1 - Nuclear reactions with weakly-bound or cluster-structured radioactive and stable nuclei
Grantee:Leandro Romero Gasques
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 16/25143-7 - Relativistic two and three-body problems in Minkowski space in (2+1) and (3+1) dimensions
Grantee:Emanuel Arthur Ydrefors
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 17/05660-0 - Theoretical studies of the structure and reactions of exotic nuclei and many-body systems
Grantee:Brett Vern Carlson
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 18/21758-2 - Relativistic few-body problems and antiproton reactions
Grantee:Emanuel Arthur Ydrefors
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor