Scale breaking at large x-intrinsic charm or higher twist?

Godbole, R. M. ; Roy, D. P. (1982) Scale breaking at large x-intrinsic charm or higher twist? Zeitschrift für Physik. C, Particles and Fields, 15 (1). pp. 39-49. ISSN 0170-9739

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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 increasing Q 2, inclusion of the hard charm contribution results in a consistent description of all data with a common Λ300-400 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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Deposited On:12 Nov 2010 08:18
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