Abstract
A hard intrinsic charm component of nucleon, as suggested by Brodsky et al., is first shown to be consistent with the available μN→μμX data, assuming a reasonable threshold factor. Such a hard charm contribution is then included in a QCD analysis of the structure function data at largex(>0.3), where the gluon contribution to the evolution equation can be safely neglected. Whereas a pure QCD fit results in a Λ going down significantly with increasingQ 2, inclusion of the hard charm contribution results in a consistent description of all data with a common Λ≃300–400 MeV. Alternatively a consistent QCD fit to these data can be obtained by including a higher twist contribution, in which case the common Λ has a much smaller value ≃100 MeV.
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Godbole, R.M., Roy, D.P. Scale breaking at largex-intrinsic charm or higher twist?. Z. Phys. C - Particles and Fields 15, 39–49 (1982). https://doi.org/10.1007/BF01573424
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DOI: https://doi.org/10.1007/BF01573424