2000/09/04 by N. N. Nikolaev, W. Schäfer, Wolfgang Schäfer +1 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.63.014020
published as Phys.Rev.D63:014020,2001 · 28 pages, incl. 8 eps-figures
arxiv created 2000/09/04 · openalex publication_date 2000/12/11 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We formulate the perturbative QCD approach to coherent diffractive dijet production in pion-nucleon and pion-nucleus collisions at high energy. For hard dijets the Pomeron splitting mechanism in which both helicity amplitudes are proportional to the unintegrated gluon structure function of the proton F(x,k2) and pion distribution amplitude \ensuremathφ_\ensuremathπ(z) is shown to dominate. In nuclear diffraction multiple Pomeron splitting components are found to give antishadowing contributions at large jet momentum k. To leading twist there is an exact cancellation of effects of nuclear attenuation and antishadowing or broadening of multiple Pomeron splitting contributions. The next-to-leading higher twist correction driven by nuclear rescatterings is calculable in hard QCD and proves to be numerically very large. We argue that large higher twist effects do not preclude the determination of gross features of \ensuremathφ_\ensuremathπ(z). Our results on the atomic mass number and momentum dependence of dijet cross sections agree well with the preliminary findings from the E791 experiment.