PoS - Proceedings of Science
Volume 316 - XXVI International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2018) - WG1: Structure Functions and Parton Densities
xFitter 2.0.0: Heavy quark matching scales: Unifying the FFNS and VFNS
 on behalf of the xFitter Developers’ Team, V. Bertone, D. Britzger, S. Camarda, A. Cooper-Sarkar, A. Geiser, F. Giuli, A. Glazov, E. Godat, A. Kusina, A. Luszczak, F. Lyonnet, F. Olness*, R. Placakyte, V. Radescu, I. Schienbein and O. Zenaiev
Full text: pdf
Pre-published on: September 20, 2018
Published on: November 23, 2018

xFitter is an open-source package that provides a framework for the
determination of the parton distribution functions (PDFs) of the
proton for many different kinds of analyses in Quantum Chromodynamics
(QCD). It incorporates experimental data from a wide range of
experiments including fixed-target, Tevatron, HERA, and LHC. xFitter
version 2.0.0 has recently been released, and offers an expanded set
of tools and options. The new xFitter 2.0.0 program links to the
APFEL code which has implemented generalized matching conditions that
enable the switch from NF to NF+1 active flavors at an arbitrary
matching scale mu_m. This enables us to generalize the transition
between a FFNS and a VFNS and essentially vary continuously between the
two schemes; in this sense the matching scale mu_m allows us to unify
the FFNS and VFNS in a common framework. This paper provides a brief
overview of xFitter with emphasis of these new features.
DOI: https://doi.org/10.22323/1.316.0015
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