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HEP Seminar: Transverse hadron structure in QCD and chiral dynamics

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Christian Weiss, Jefferson Laboratory
06 December 2017 from 1:30 PM to 2:30 PM
339 Davey Laboratory
Contact Name
Anna Stasto
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Exploring the spatial stucture of hadrons in QCD is a prime objective of modern strong interaction physics. A spatial representation of hadrons as extended systems is naturally obtained when viewing the hadron and its quark/gluon content at fixed light-front time (transverse densities, generalized parton distributions). At peripheral transverse distances b ~ 1/(pion mass) the spatial structure is governed by the effective dynamics resulting from the spontaneous breaking of chiral symmetry in QCD and can be computed from first principles, using methods of chiral effective field theory. Recent theoretical work has studied: (a) the peripheral transverse densities of charge and magnetization in the nucleon and their connection with nucleon electromagnetic form factors at low momentum transfer; (b) the peripheral density of angular momentum in the nucleon and the form factors of the energy-momentum tensor; (c) a quantum-mechanical picture of chiral dynamics permitting an intuitive understanding of peripheral nucleon structure; (d) the peripheral quark/gluon densities in the nucleon and their possible measurement in high-energy scattering processes at the LHC and a future Electron-Ion Collider (EIC). The seminar aims to give an overview of the basic concepts and main results, as well as future applications.