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Progress and Opportunities in Backward angle (u-channel) Physics

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arxiv 2107.06748 v5 pith:LJ4PR2NZ submitted 2021-07-14 hep-ph nucl-exnucl-th

classification hep-phnucl-exnucl-th
keywords u-channelanglephysicsbackwarddiscussmeasurementsopportunitiesprogress
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Backward angle (u-channel) scattering provides complementary information for studies of hadron spectroscopy and structure, but has been less comprehensively studied than the corresponding forward angle case. As a result, the physics of u-channel scattering poses a range of new experimental and theoretical opportunities and questions. We summarize recent progress in measuring and understanding high energy reactions with baryon charge exchange in the u-channel, as discussed in the first backward angle (u-channel) Physics Workshop. In particular, we discuss backward angle measurements and their theoretical description via both hadronic models and the collinear factorization approach, and discuss planned future measurements of u-channel physics. Finally, we propose outstanding questions and challenges for u-channel physics.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Toward an advanced phenomenology of $\pi N$ transition distribution amplitudes

    hep-ph 2025-06 conditional novelty 7.0 of 10

    A flexible two-component model of pion-nucleon transition distribution amplitudes is fitted to CLAS data and used to predict cross-sections and three leading-twist spin asymmetries for backward pion electroproduction.

  2. Ultra-peripheral Collisions

    hep-ex 2026-07 conditional novelty 1.0 of 10

    Ultra-peripheral collisions of heavy ions are reviewed as the energy frontier for photon physics; the paper consolidates a decade of LHC/RHIC results and proposes no new measurement.

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