1.2k citations · 8.2k across the 115 of their papers we have counts for
11 papers · 2 filters
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…
The photon-pion transition form factor for virtual photons
M. Diehl, P. Kroll, C. Vogt
We discuss the photon to meson transition form factor for virtual photons, which can be measured in e+ e- collisions. We demonstrate that this form factor is independent of the sha…
Yet another way to measure
M. Diehl, G. Hiller
We show that the CKM phase can be extracted from measurement of the time dependent rates in the decays and , wher…
New ways to explore factorization in b decays
M. Diehl, G. Hiller
We propose to study factorization breaking effects in exclusive b decays where they are strongly enhanced over the factorizing contributions. This can be done by selecting final-st…
Generalized parton distributions with helicity flip
M. Diehl
We show that for both quarks and gluons there are eight generalized parton distributions in the proton: four which conserve parton helicity and four which do not. We explain why ti…
Exclusive QCD
Markus Diehl
I give a brief introduction to the physics of generalized parton distributions and distribution amplitudes. I then report on the status of the calculation of radiative corrections…