Speaker
Vladimir Braun
(University of Regensburg)
Description
We carry out the first complete calculation of kinematic power corrections $\sim
t/Q^2$ and $\sim m^2/Q^2$ to several key observables in Deeply Virtual Compton Scattering.
The issue of convention dependence of the leading twist approximation is discussed in detail.
In addition we work out representations for the higher twist corrections in terms of double distributions,
Mellin-Barnes integrals and also within a dissipative framework.
This study removes an important source of uncertainties in the QCD predictions for
intermediate photon virtualities $Q^2\sim 1$-$5\,\text{GeV}^2$ that are accessible in the existing
and planned experiments. In particular the finite-t corrections are significant and
must be taken into account in the data analysis.
Authors
Alexander Manashov
(University of Regensburg)
Bjoern Pirnay
(University of Regensburg)
Dieter Mueller
(Bochum University)
Vladimir Braun
(University of Regensburg)
