2018/01/15 by Jorge Segovia, Cédric Mezrag, Lei Chang +1 · 1 citation
Physics and Astronomy · #nucl-th #hep-ex #hep-lat #hep-ph
paper · pdf · doi:10.1007/s00601-018-1341-7
Contribution to the proceedings of the Workshop: Critical Stability of Quantum Few-Body Systems (Crit17). Oct. 16-20, 2017. Dresden, Germany
arxiv created 2018/01/15 · arxiv updated 2018/04/04
We explain how the emergent phenomenon of dynamical chiral symmetry breaking ensures that Poincaré covariant analyses of the three valence-quark scattering problem in continuum quantum field theory yield a picture of the nucleon as a Borromean bound-state, in which binding arises primarily through the sum of two separate contributions. One involves aspects of the non-Abelian character of Quantum Chromodynamics that are expressed in the strong running coupling and generate tight, dynamical color-antitriplet quark-quark correlations in the scalar-isoscalar and pseudovector-isotriplet channels. This attraction is magnified by quark exchange associated with diquark breakup and reformation, which is required in order to ensure that each valence-quark participates in all diquark correlations to the complete extent allowed by its quantum numbers. Combining these effects, we arrive at a properly antisymmetrised Faddeev wave function for the nucleon and calculate, e.g. the flavor-separated versions of the Dirac and Pauli form factors and the proton's leading-twist parton distribution amplitude. We conclude that available data and planned experiments are capable of validating the proposed picture.