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The handbag contribution to gamma gamma to pi pi and K K
M. Diehl, P. Kroll, C. Vogt
We investigate the soft handbag contribution to two-photon annihilation into pion or kaon pairs at large energy and momentum transfer. The amplitude is expressed as a hard gamma ga…
Designer mesons for exploring factorization in b decays
M. Diehl
I explain how various aspects of factorization in exclusive b decays can be studied with mesons having a small decay constant or spin greater than one.
Probing generalized parton distributions in pi N -> l+ l- N
E. R. Berger, M. Diehl, B. Pire
We study the exclusive reactions pi- p -> l+ l- n and pi+ n -> l+ l- p$ in view of possible future experiments with high-intensity pion beams. For large invariant mass of the lepto…
Timelike Compton scattering: exclusive photoproduction of lepton pairs
E. R. Berger, M. Diehl, B. Pire
We investigate the exclusive photoproduction of a heavy timelike photon which decays into a lepton pair, gamma p -> l+ l- p. This can be seen as the analog of deeply virtual Compto…
The annihilation of virtual photons into pseudoscalar mesons
M. Diehl, P. Kroll, C. Vogt
We investigate the possibility to constrain the pion distribution amplitude from the gamma* gamma* -> pi transition. For a surprisingly large range in the two photon virtualities w…
Generalized parton distributions in the deuteron
E. R. Berger, F. Cano, M. Diehl +1
We introduce generalized quark and gluon distributions in the deuteron, which can be measured in exclusive processes like deeply virtual Compton scattering and meson electroproduct…