NLO corrections and contribution of a tensor gluon operator to the process $γ^*γ\to ππ$

Details NLO corrections and contribution of a tensor gluon operator to the process $γ^*γ\to ππ$ NLO corrections and contribution of a tensor gluon operator to the process $γ^*γ\to ππ$

1999-08-12

arxiv.org/abs/hep-ph/9908334v3

Phys.Lett.B467:263-270,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 5 figures, some misprints corrected, one new reference added, some improvements due to comments which we have receiv

Scientific paper

10.1016/S0370-2693(99)01148-X

We have calculated the NLO corrections for the leading twist amplitude of the reaction $\gamma^*\gamma\to\pi\pi$ at large virtuality of the photon and at $W^2\ll Q^2$. 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 $e+\gamma\to e'+\pi\pi$.

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