Intrinsic charm and photon-gluon fusion contributions to muoproduction of charm

Abstract

The charm muoproduction data has been analysed in terms of the intrinsic charm and the _γG fusion contributions, in order to estimate the intrinsic charm content of the nucleon. Unfortunately the result is sensitive to the choices of fragmentation function and the energy scale of α_s, that one makes for the fusion contribution. Nonetheless, there is one solution with a hard intrinsic charm spectrum-very similar to that suggested by the recent hadroproduction data.