1999/08/31 by N. Kivel, L. Mankiewicz, M. V. Polyakov · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/s0370-2693(99)01148-x
published as Phys.Lett.B467:263-270,1999 · 12 pages, 5 figures, some misprints corrected, one new reference added, some improvements due to comments which we have received recently have been incorporated
arxiv created 1999/09/28 · openalex publication_date 1999/11/01 · arxiv updated 2009/11/30 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/29
We have calculated the NLO corrections for the leading twist amplitude of the reaction γ^*γ→ππ at large virtuality of the photon and at W2≪ Q2. With a simple model for the two-pion quark and gluon distribution amplitudes we have estimated that the NLO effects may reduce the leading-order amplitude by as much as 30%. We have found that besides the usual twist-2 quark and gluon operators the NLO amplitude receives contribution from a distribution associated with twist-2 tensor gluon operator. The new gluon distribution can be investigated by studying the azimuthal asymmetry of the cross section for e+γ→ e'+ππ.