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Charm production in two-photon collisions: Calculation of the leading nonperturbative contribution in QCD |
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| Authors: | A. Yu. Khodjamirian A. G. Oganessian |
| Affiliation: | Institute for Theoretical Physics, University of Bern, CH-3012, Bern, Switzerland Theory Division, Yerevan Physics Institute, 375036, Yerevan, Armenia |
| Abstract: | The leading nonperturbative contribution to the cross section of charm production in two-photon collisions is calculated in QCD. Operator expansion is used and the c-quark interaction with vacuum gluon condensate is taken into account. As a result, the moments of the charm contribution to the photon structure function are obtained. The moments with sufficiently high numbers turn out to be sensitive to the gluon condensate. |
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