Exclusive Photoproduction of Hard Dijets and Magnetic Susceptibility of the QCD Vacuum
V. M. BraunInstitut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, GermanyStefan GottwaldInstitut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, GermanyDmitry Yu. IvanovInstitut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, GermanyAndreas SchäferInstitut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, GermanyL. SzymanowskiCPhT, École Polytechnique, F-91128 Palaiseau, France*
2002en
ABI
Abstract
We argue that coherent production of hard dijets by linearly polarized real photons can provide direct evidence for chirality violation in hard processes, the first measurement of the magnetic susceptibility of the quark condensate and the photon distribution amplitude. It can also serve as a sensitive probe of the generalized gluon parton distribution. Numerical calculations are presented for HERA kinematics.
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Cited by 20 references