Abstract
We discuss the impact of the charm quark mass in the CTEQ NNLO global
analysis of parton distribution functions of the proton. The \$MS\$
mass \$m\_c(m\_c)\$ of the charm quark is extracted in the S-ACOT-\$\chi\$
heavy-quark factorization scheme at \$O(\alpha\_s^2)\$ accuracy and found
to be in agreement with the world-average value. Impact on \$m\_c(m\_c)\$ of
combined HERA-1 data on semiinclusive charm production at HERA collider and
contributing systematic uncertainties are reviewed.
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