10,627 research outputs found
QCD Factorization for the Pion Diffractive Dissociation Into Two Jets
We report a detailed study of the process of pion diffraction dissociation
into two jets with large transverse momenta. We find that the standard
collinear factorization does not hold in this reaction. The structure of
non-factorizable contributions is discussed and the results are compared with
the experimental data. Our conclusion is that the existing theoretical
uncertainties do not allow, for the time being, for a quantitative extraction
of the pion distribution amplitude. (Talk presented at the Workshop on
Exclusive Processes at High Momentum Transfer, Jefferson News, VA, May 15-18,
2002)Comment: 6 pages, latex, two figure
Exclusive diffractive electroproduction of dijets in collinear factorization
Exclusive electroproduction of hard dijets can be described within the
collinear factorization. This process has clear experimental signature and
provides one with an interesting alternative venue to test QCD description of
hard diffractive processes and extract information on generalized nucleon
parton distributions. In this work we present detailed leading-order QCD
calculations of the relevant cross sections, including longitudinal momentum
fraction distribution of the dijets and their azimuthal angle dependence.Comment: 11 pages, 14 Postscript figures, uses revtex4.st
On the Coulomb corrections to the total cross section of the interaction of the atom with ordinary atoms at high energy
The size of atom in the low lying states is considerably smaller
than the radius of atomic screening. Due to that we can neglect this screening
calculating the contribution of multi-photon exchanges. We obtain the analytic
formula for Coulomb corrections which works with a very good accuracy for the
ground state of atom.Comment: 9 pages, LATEX with 1 Postscript figur
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