PQCD Formulations with Heavy Quark Masses and Global Analysis

Details PQCD Formulations with Heavy Quark Masses and Global Analysis PQCD Formulations with Heavy Quark Masses and Global Analysis

2008-09-03

arxiv.org/abs/0809.0714v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

Contribution to the HERA - LHC Workshop Proceedings. 19 pages, 2 figures in the form of .eps files. Slightly modified, respond

Scientific paper

We critically review heavy quark mass effects in DIS and their impact on global analyses. We lay out all elements of a properly defined general mass variable flavor number scheme (GM VFNS) that are shared by all modern formulations of the problem. We then explain the freedom in choosing specific implementations and spell out, in particular, the current formulations of the CTEQ and MSTW groups. We clarify the approximations in the still widely-used zero mass variable flavor scheme (ZM VFNS), mention the inherent flaws in its conventional implementation, and consider the possibility of mending some of these flaws. We discuss practical issues concerning the use of parton distributions in various physical applications, in view of the different schemes. And we comment on the possible presence of intrinsic heavy flavors.

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