224,732 research outputs found
Photon emission in Pb+Pb collisions at SpS and LHC
Yield of direct photons in Pb+Pb collisions at SpS and LHC energy is
evaluated with emphasis on estimate of possible uncertainty. Possibility of
experimental observation of direct photons at LHC is discussed. Predictions of
several models at SpS energy are compared with experimental data.Comment: 19 pages, 13 figure
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
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