6 papers · 1 filter
Two Photon Distribution Amplitudes
M. El Beiyad, B. Pire, L. Szymanowski +1
The factorization of the amplitude of the process gamma* gamma -> gamma gamma in the low energy and high photon virtuality region is demonstrated at the Born order and in the leadi…
Diphoton Generalized Distribution Amplitudes
M. El Beiyad, B. Pire, L. Szymanowski +1
We calculate the leading order diphoton generalized distribution amplitude by calculating the amplitude of the process gamma* gamma -> gamma gamma in the low energy and high photon…
In search of the QCD odderon in exclusive J/psi and Upsilon hadroproduction
Lech Szymanowski
Phenomenological studies of odderon effects are shortly reviewed. Special emphasis is devoted to a recent study of the exclusive production of J/psi or Upsilon in pp and bar p p co…
Production of a pion in association with a high-Q2 dilepton pair in antiproton-proton annihilation at GSI-FAIR
J. P. Lansberg, B. Pire, L. Szymanowski
We evaluate the cross section for anti-p p -> l+ l- pi0 in the forward direction and for large lepton pair invariant mass. In this kinematical region, the leading-twist amplitude f…
Studying QCD factorizations in exclusive gamma* gamma* -> rho^0_L rho^0_L
S. Wallon, B. Pire, M. Segond +1
The exclusive process e+ e- -> e+ e- rho^0_L rho^0_L allows to study various dynamics and factorization properties of perturbative QCD. At moderate energy, we demonstrate how colli…
Exclusive J/psi and Upsilon hadroproduction as a probe of the QCD Odderon
Lech Szymanowski
We study the exclusive production of J/psi or Upsilon in pp and bar pp collisions, where the meson emerges from the pomeron--odderon and the pomeron--photon fusion. We estimate the…