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Creators/Authors contains: "Weiss, Christian"

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  1. ; (, Sissa Medialab)
    Abstract The target normal single-spin asymmetry in electron nucleon scattering is studied in the framework of the 1/Nc expansion of QCD, which allows for a rigorous description in the energy range that includes the Δ resonance and below the second baryon resonance region. The asymmetry is driven by the absorptive part of the two-photon exchange component of the scattering amplitude, being therefore the most unambiguous two-photon exchange effect. Such amplitude is shown to be described up to the next to leading order in the 1/Nc expansion only in terms of the charge and magnetic form factors of the nucleons, a consequence of the approximate SU(4) spin flavor symmetry valid in the large Nc limit for baryons. A discussion is provided of the 1/Nc expansion framework along with the results for the asymmetries in elastic (e−N↑→e−N), inelastic (e−N↑→e−Δ), and inclusive scattering. 
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  2. ; ; ; (, Physics Letters B)
    N → transitions offer new possibilities for exploring the isovector component of the QCD quark angular momentum (AM) operator causing the J u−d flavor asymmetry in the nucleon. We extend the concept of QCD AM to transitions between baryon states, using light-front densities of the energy-momentum tensor in transversely localized states. We calculate the N → transition AM in the 1/Nc expansion, connect it with the J u−d flavor asymmetry in the nucleon, and estimate the values using lattice QCD results. In the same setup, we connect the transition AM to the transition GPDs sampled in hard exclusive electroproduction processes with N → transitions, enabling experimental study of the transition AM. 
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