Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-03-26
Phys.Lett. B509 (2001) 43-52
Physics
High Energy Physics
High Energy Physics - Phenomenology
Original version from 9 April restored
Scientific paper
10.1016/S0370-2693(01)00554-8
We calculate the cross section of a pion diffraction dissociation in two jets with large transverse momenta originating from a hard gluon exchange between the pion constituents. To the leading logarithmic accuracy (in energy), the contribution coming from small transverse separations between the quark and the antiquark in the pion acquires the expected factorized form, the longitudinal momentum distribution of the jets being proportional to the pion distribution amplitude. The hard gluon exchange can in this case be considered as a part of the unintegrated gluon distribution. Beyond the leading logarithms (in energy) this proportionality does not hold. Moreover, the collinear factorization appears to be broken by the end-point singularities. Remarkably enough, the longitudinal momentum distribution of the jets for the non-factorizable contribution is calculable, and turns out to be the same as for the factorizable contribution with the asymptotic pion distribution amplitude.
Braun Vladimir M.
Ivanov Dmitri Yu.
Schaefer Andreas
Szymanowski Lech
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