Higher-order QCD corrections to exclusive processes: The multiple scattering mechanism |
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Authors: | P. V. Landshoff D. J. Pritchard |
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Affiliation: | 1. Department of Applied Mathematics and Theoretical Physics, University of Cambridge, CB3 9EW, UK
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Abstract: | The multiple-scattering diagram, calculated to lowest order in QCD, fits well topp elastic scattering data at larget. It is shown that higherorder QCD corrections seem to spoil this agreement: calculated as far as the insertion of two additional gluons, they give an exponential factor. This factor differs in detail from some previous conjectures. For colour-singlet bound states of quarks, the exponential factor is independent of whether or not the gluon mass is zero, unlike the case of simple quark-quark scatterin. Two régimes are considered:t ands of the same order, andt large but much less thans. Exponentiation seems to occur in both cases, but in a non-abelian theory more diagrams are important for the latter case. |
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