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      Timelike form factors at high energy

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          Abstract

          The difference between the timelike and spacelike meson form factors is analysed in the framework of perturbative QCD with Sudakov effects included. It is found that integrable singularities appear but that the asymptotic behavior is the same in the timelike and spacelike regions. The approach to asymptotia is quite slow and a rather constant enhancement of the timelike value is expected at measurable large \(Q^{2}\). This is in agreement with the trend shown by experimental data.

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          Journal
          15 March 1994
          10.1103/PhysRevD.51.15
          hep-ph/9403293
          Custom metadata
          Phys.Rev.D51:15-24,1995
          17 pages, report DAPNIA/SPhN 94 09
          hep-ph

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