Charm quark mass dependence in the CTEQ NNLO global QCD analysis

TL;DR

This paper examines how the charm quark mass influences the determination of proton parton distribution functions in a high-precision NNLO QCD analysis, providing a refined measurement consistent with world averages.

Contribution

It presents a novel extraction of the charm quark mass within the CTEQ NNLO framework using the S-ACOT-χ scheme, incorporating recent HERA data and systematic uncertainties.

Findings

Charm quark mass $m_c(m_c)$ agrees with world-average values.

HERA semiinclusive charm data significantly impact $m_c(m_c)$ determination.

Systematic uncertainties are thoroughly reviewed.

Abstract

We discuss the impact of the charm quark mass in the CTEQ NNLO global analysis of parton distribution functions of the proton. The $\bar{\rm MS}$ mass $m_c(m_c)$ of the charm quark is extracted in the S-ACOT-$\chi$ heavy-quark factorization scheme at ${\cal O}(\alpha_s^2)$ 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.