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Hard exclusive processes in the backward region

Abstract : We review the potentialities offered by the study of backward exclusive processes in a new scaling regime, i.e. involving a large -timelike or spacelike- Q2 photon and a baryonic exchange in the t-channel. We recall the concept of Transition Distribution Amplitudes (TDAs) containing unique information on the hadron structure, then discuss how they enter the description of processes such as backward electroproduction of a pion, antiproton-proton annihilations into a dilepton + meson as well as into J/psi + meson. We then discuss first phenomenological studies for processes that are being analysed at JLAB and HERMES or that will be measured by Panda at GSI-FAIR. Finally we present outlooks for their theoretical studies based on approaches such as the pion-cloud model
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Preprints, Working Papers, ...
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http://hal.in2p3.fr/in2p3-00544738
Contributor : Jean-Philippe Lansberg <>
Submitted on : Wednesday, December 8, 2010 - 6:01:42 PM
Last modification on : Wednesday, October 14, 2020 - 3:57:03 AM

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  • HAL Id : in2p3-00544738, version 1
  • ARXIV : 1011.3410

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J.-P. Lansberg, B. Pire, L. Szymanowski. Hard exclusive processes in the backward region. 2010. ⟨in2p3-00544738⟩

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