English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Baryon to meson transition distribution amplitudes (TDAs) extend the conceptof generalized parton distributions. Baryon to meson TDAs appear as buildingblocks in the collinear factorized description of amplitudes for a class ofhard exclusive reactions, prominent examples of which being hard exclusivemeson electroproduction off a nucleon in the backward region andbaryon-antibaryon annihilation into a meson and a lepton pair. We study thegeneral properties of these objects following from the underlying symmetries ofQCD. In particular, the Lorentz symmetry results in the polynomiality propertyof the Mellin moments in longitudinal momentum fractions. We present a detailedaccount of the isotopic and permutation symmetry properties of nucleon to pion(\pi N) TDAs. This restricts the number of independent leading twist \pi N TDAsto eight functions, providing description of all isotopic channels. Usingchiral symmetry and the crossing relation between \pi N TDAs and \pi Ngeneralized distribution amplitudes we establish soft pion theorems for \pi NTDAs, which determine the magnitude of \pi N TDAs. Finally, we build a simpleresonance exchange model for \pi N TDAs considering N and \Delta(1232) exchangecontributions into the isospin-1/2 and isospin-3/2 \pi N TDAs.

\pi N transition distribution amplitudes: Their symmetries and constraints from chiral dynamics