XFitter 2.0.0: Heavy quark matching scales: Unifying the FFNS and VFNS

xFitter Developers' Team

doi:10.22323/1.316.0015

XFitter 2.0.0: Heavy quark matching scales: Unifying the FFNS and VFNS

xFitter Developers' Team

(Astro)-Particles Physics

Research output: Chapter in Book / Report / Conference proceeding › Conference contribution › Academic › peer-review

Abstract

xFitter [1] 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 [2] which has implemented generalized matching conditions that enable the switch from N_F to N_F +1 active flavors at an arbitrary matching scale μ_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 μ_m allows us to unify the FFNS and VFNS in a common framework [3]. This paper provides a brief overview of xFitter with emphasis of these new features.

Original language	English
Title of host publication	Proceedings of Science - PoS (DIS2018) 015
Pages	0-5
Number of pages	6
Volume	316
DOIs	https://doi.org/10.22323/1.316.0015
Publication status	Published - 26 Aug 2018
Event	26th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2018 - Kobe, Japan Duration: 16 Apr 2018 → 20 Apr 2018

Publication series

Name	Proceedings of Science
Publisher	Sissa Medialab Srl

Conference

Conference	26th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2018
Country/Territory	Japan
City	Kobe
Period	16/04/18 → 20/04/18

Bibliographical note

Issue: XXVI International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2018) - WG1: Structure Functions and Parton Densities

Funding

∗We acknowledge the hospitality of CERN, DESY, and Fermilab where a portion of this work was performed. This work was also partially supported by the U.S. Department of Energy under Grant No. DE-SC0010129. We are grateful to the DESY IT department for their support of the xFitter developers. †Speaker.

Funders	Funder number
U.S. Department of Energy	DE-SC0010129
Fermilab
Deutsches Elektronen-Synchrotron

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10.22323/1.316.0015

https://arxiv.org/abs/1808.08623

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title = "XFitter 2.0.0: Heavy quark matching scales: Unifying the FFNS and VFNS",

abstract = "xFitter [1] 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 [2] which has implemented generalized matching conditions that enable the switch from NF to NF +1 active flavors at an arbitrary matching scale μm. 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 μm allows us to unify the FFNS and VFNS in a common framework [3]. This paper provides a brief overview of xFitter with emphasis of these new features.",

author = "V. Bertone and D. Britzger and S. Camarda and A. Cooper-Sarkar and A. Geiser and F. Giuli and A. Glazov and E. Godat and A. Kusina and A. Luszczak and F. Lyonnet and F. Olness and R. Pla{\v c}akyte and V. Radescu and I. Schienbein and O. Zenaiev and {xFitter Developers' Team}",

note = "Issue: XXVI International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2018) - WG1: Structure Functions and Parton Densities; 26th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2018 ; Conference date: 16-04-2018 Through 20-04-2018",

year = "2018",

month = aug,

day = "26",

doi = "10.22323/1.316.0015",

language = "English",

volume = "316",

series = "Proceedings of Science",

publisher = "Sissa Medialab Srl",

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T2 - 26th International Workshop on Deep-Inelastic Scattering and Related Subjects, DIS 2018

AU - Bertone, V.

AU - Britzger, D.

AU - Camarda, S.

AU - Cooper-Sarkar, A.

AU - Geiser, A.

AU - Giuli, F.

AU - Glazov, A.

AU - Godat, E.

AU - Kusina, A.

AU - Luszczak, A.

AU - Lyonnet, F.

AU - Olness, F.

AU - Plačakyte, R.

AU - Radescu, V.

AU - Schienbein, I.

AU - Zenaiev, O.

AU - xFitter Developers' Team

N1 - Issue: XXVI International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2018) - WG1: Structure Functions and Parton Densities

PY - 2018/8/26

Y1 - 2018/8/26

N2 - xFitter [1] 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 [2] which has implemented generalized matching conditions that enable the switch from NF to NF +1 active flavors at an arbitrary matching scale μm. 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 μm allows us to unify the FFNS and VFNS in a common framework [3]. This paper provides a brief overview of xFitter with emphasis of these new features.

AB - xFitter [1] 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 [2] which has implemented generalized matching conditions that enable the switch from NF to NF +1 active flavors at an arbitrary matching scale μm. 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 μm allows us to unify the FFNS and VFNS in a common framework [3]. This paper provides a brief overview of xFitter with emphasis of these new features.

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XFitter 2.0.0: Heavy quark matching scales: Unifying the FFNS and VFNS

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