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Baryon-to-meson and baryon-to-photon transition distribution amplitudes(TDAs) arise in the collinear factorized description of a class of hardexclusive reactions characterized by the exchange of a non-zero baryon numberin the cross channel. These TDAs extend the concepts of generalized partondistributions (GPDs) and baryon distribution amplitudes (DAs). In this review,we discuss the general properties and physical interpretation ofbaryon-to-meson and baryon-to-photon TDAs. We argue that these non-perturbativeobjects are a convenient complementary tool to explore the structure of baryonsat the partonic level. We present an overview of hard exclusive reactionsadmitting a description in terms of TDAs. We discuss the first signals fromhard exclusive backward meson electroproduction at JLab with the 6 GeV electronbeam and explore further experimental opportunities to access TDAs at JLab@12GeV, PANDA, J-PARC and EIC.

Transition distribution amplitudes and hard exclusive reactions with baryon number transfer