Emergent phenomena and partonic structure in hadrons

Abstract

Modern facilities are poised to tackle fundamental questions within the Standard Model, aiming to reveal the nature of confinement, its relationship to dynamical chiral symmetry breaking (DCSB) - the origin of visible mass - and the connection between these two, key emergent phenomena. There is strong evidence to suggest that they are intimately connected with the appearance of momentum-dependent masses for gluons and quarks in QCD, which are large in the infrared: $m_g\sim 500$MeV and $M_q\sim 350$MeV. DCSB, expressed in the dynamical generation of a dressed-quark mass, has an enormous variety of verifiable consequences, including an enigmatic result that the properties of the (almost) massless pion are the cleanest expression of the mechanism which is responsible for almost all the visible mass in the Universe. This contribution explains that these emergent phenomena are expressed with particular force in the partonic structure of hadrons, e.g. in valence-quark parton distribution amplitudes and functions, and, consequently, in numerous hadronic observables, so that we are now in a position to exhibit the consequences of confinement and DCSB in a wide range of hadron observables, opening the way to empirical verification of their expression in the Standard Model.

12 pages, 2 figures. Contribution to the proceedings of XIIth Quark Confinement and the Hadron Spectrum, 29 August 2016 - 3 September 2016, Thessaloniki, Greece. arXiv admin note: text overlap with arXiv:1606.03909

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Cited by in corpus (6)

• On the hadron mass decomposition
• Nuclear-bound quarkonia and heavy-flavor hadrons
• Emergence of mass in the gauge sector of QCD
• Evidence of ghost suppression in gluon mass dynamics
• Structure of the orbital excited $N^{\ast }$ from the Schwinger-Dyson equations
• Extracting a model quark propagator's spectral density