Parton distribution functions, αs, and heavy-quark masses for LHC Run II

S. Alekhin, J. Blümlein, S. Moch, and R. Plačakytė
Phys. Rev. D 96, 014011 – Published 18 July 2017

Abstract

We determine a new set of parton distribution functions (ABMP16), the strong coupling constant αs and the quark masses mc, mb and mt in a global fit to next-to-next-to-leading order (NNLO) in QCD. The analysis uses the MS¯ scheme for αs and all quark masses and is performed in the fixed-flavor number scheme for nf=3, 4, 5. Essential new elements of the fit are the combined data from HERA for inclusive deep-inelastic scattering (DIS), data from the fixed-target experiments NOMAD and CHORUS for neutrino-induced DIS, data from Tevatron and the LHC for the Drell-Yan process and the hadro-production of single-top and top-quark pairs. The theory predictions include new improved approximations at NNLO for the production of heavy quarks in DIS and for the hadro-production of single-top quarks. The description of higher twist effects relevant beyond the leading twist collinear factorization approximation is refined. At NNLO, we obtain the value αs(nf=5)(MZ)=0.1147±0.0008.

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  • Received 31 January 2017

DOI:https://doi.org/10.1103/PhysRevD.96.014011

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

S. Alekhin1,2, J. Blümlein3, S. Moch1, and R. Plačakytė1

  • 1II. Institut für Theoretische Physik, Universität Hamburg Luruper Chaussee 149, D–22761 Hamburg, Germany
  • 2Institute for High Energy Physics, 142281 Protvino, Moscow region, Russia
  • 3Deutsches Elektronensynchrotron DESY, Platanenallee 6, D–15738 Zeuthen, Germany

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Vol. 96, Iss. 1 — 1 July 2017

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