Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-06-05
Phys.Lett. B447 (1999) 308-312
Physics
High Energy Physics
High Energy Physics - Phenomenology
Replaced by an extended version for Phys.Lett.B. Based on invited talks at the International Workshop on Diffraction Physics,
Scientific paper
10.1016/S0370-2693(99)00011-8
Partonic interpretation of high-energy reactions is known to depend on a reference frame. Particularly, in the rest frame of the target Drell-Yan process looks like freeing of the projectile lepton-antilepton fluctuation, rather than q+qbar -> l+lbar annihilation. The light-cone representation for Drell-Yan reaction is very similar to that in DIS and exposes a substantial contamination of soft interactions, which turn out to be dominant in diffractive production of lepton pairs and in nuclear shadowing. We estimate the fraction of diffractive events in the total Drell-Yan cross section, which scales in M^2, and find a substantial deviation from factorization. An analogous approach is developed for diffractive production of heavy flavors.
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