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Abstract: We critically review heavy quark mass effects in DIS and their impact onglobal analyses. We lay out all elements of a properly defined general massvariable flavor number scheme GM VFNS that are shared by all modernformulations of the problem. We then explain the freedom in choosing specificimplementations and spell out, in particular, the current formulations of theCTEQ and MSTW groups. We clarify the approximations in the still widely-usedzero mass variable flavor scheme ZM VFNS, mention the inherent flaws in itsconventional implementation, and consider the possibility of mending some ofthese flaws. We discuss practical issues concerning the use of partondistributions in various physical applications, in view of the differentschemes. And we comment on the possible presence of intrinsic heavy flavors.



Author: R.S. Thorne, W.K. Tung

Source: https://arxiv.org/







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