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Exploring backward pion electroproduction in the scaling regime
J. P. Lansberg, B. Pire, L. Szymanowski
We use general relations between the Transition Distribution Amplitudes (TDAs), entering the description of the p -> pi0 transition, and the proton Distribution Amplitudes (DAs) in…
Off-shell and non-static contributions to heavy-quarkonium production
J. P. Lansberg
We have shown that if one relaxes the constraint that the quarks in a heavy quarkonium are at rest and on-shell, new contributions to the discontinuity of the production amplitude…
Two-photon width of eta_b, eta'_b and eta''_b from Heavy-Quark Spin Symmetry
J. P. Lansberg, T. N. Pham
We predict the two-photon width of the pseudoscalar bottomonia, Gamma(eta_b -> gamma gamma), Gamma(eta'_b -> gamma gamma) and Gamma(eta''_b -> gamma gamma) within a Heavy-Quark Spi…
Backward DVCS and Proton to Photon Transition Distribution Amplitudes
J. P. Lansberg, B. Pire, L. Szymanowski
We analyse deeply-virtual Compton scattering on a proton target, gamma* P -> P' gamma in the backward region and in the scaling regime. We define the transition distribution amplit…
Two-photon width of eta_c and eta'_c from Heavy-Quark Spin Symmetry
J. P. Lansberg, T. N. Pham
We evaluate the two-photon width of the pseudoscalar charmonia, Gamma(eta_c -> gamma gamma) and Gamma(eta'_c -> gamma gamma), within a Heavy-Quark Spin-Symmetry setting and show th…
Exclusive meson pair production in gamma* gamma scattering at small momentum transfer
J. P. Lansberg, B. Pire, L. Szymanowski
We study the exclusive production of pi pi and rho pi in hard gamma* gamma scattering in the forward kinematical region where the virtuality of one photon provides us with a hard s…