Theoretical issues in PDF determination and associated uncertainties NNPDF Collaboration

Richard D. Ball; Valerio Bertone; Luigi Del Debbio; Stefano Forte; Alberto Guffanti; Juan Rojo; Maria Ubiali

doi:10.1016/j.physletb.2013.05.019

Theoretical issues in PDF determination and associated uncertainties NNPDF Collaboration

Richard D. Ball, Valerio Bertone, Luigi Del Debbio, Stefano Forte^*, Alberto Guffanti, Juan Rojo, Maria Ubiali

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

We study several sources of theoretical uncertainty in the determination of parton distributions (PDFs) which may affect current PDF sets used for precision physics at the Large Hadron Collider, and explain discrepancies between them. We consider in particular the use of fixed-flavor versus variable-flavor number renormalization schemes, higher twist corrections, and nuclear corrections. We perform our study in the framework of the NNPDF2.3 global PDF determination, by quantifying in each case the impact of different theoretical assumptions on the output PDFs. We also study in each case the implications for benchmark cross sections at the LHC. We find that the impact in a global fit of a fixed-flavor number scheme is substantial, the impact of higher twists is negligible, and the impact of nuclear corrections is moderate and circumscribed. (C) 2013 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	330-339
Number of pages	10
Journal	Physics Letters B
Volume	723
Issue number	4-5
DOIs	https://doi.org/10.1016/j.physletb.2013.05.019
Publication status	Published - 25 Jun 2013

Keywords / Materials (for Non-textual outputs)

DEEP-INELASTIC SCATTERING
HERA

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10.1016/j.physletb.2013.05.019

Particle Theory at the Tait Institute
Ball, R., Berera, A., Boyle, P., Del Debbio, L., Figueroa-O'Farrill, J., Gardi, E., Horsley, R., Kennedy, A., Kenway, R., Pendleton, B. & Simon Soler, J.
STFC
1/10/11 → 30/09/15
Project: Research

Cite this

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title = "Theoretical issues in PDF determination and associated uncertainties NNPDF Collaboration",

abstract = "We study several sources of theoretical uncertainty in the determination of parton distributions (PDFs) which may affect current PDF sets used for precision physics at the Large Hadron Collider, and explain discrepancies between them. We consider in particular the use of fixed-flavor versus variable-flavor number renormalization schemes, higher twist corrections, and nuclear corrections. We perform our study in the framework of the NNPDF2.3 global PDF determination, by quantifying in each case the impact of different theoretical assumptions on the output PDFs. We also study in each case the implications for benchmark cross sections at the LHC. We find that the impact in a global fit of a fixed-flavor number scheme is substantial, the impact of higher twists is negligible, and the impact of nuclear corrections is moderate and circumscribed. (C) 2013 Elsevier B.V. All rights reserved.",

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author = "Ball, {Richard D.} and Valerio Bertone and {Del Debbio}, Luigi and Stefano Forte and Alberto Guffanti and Juan Rojo and Maria Ubiali",

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doi = "10.1016/j.physletb.2013.05.019",

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TY - JOUR

T1 - Theoretical issues in PDF determination and associated uncertainties NNPDF Collaboration

AU - Ball, Richard D.

AU - Bertone, Valerio

AU - Del Debbio, Luigi

AU - Forte, Stefano

AU - Guffanti, Alberto

AU - Rojo, Juan

AU - Ubiali, Maria

PY - 2013/6/25

Y1 - 2013/6/25

N2 - We study several sources of theoretical uncertainty in the determination of parton distributions (PDFs) which may affect current PDF sets used for precision physics at the Large Hadron Collider, and explain discrepancies between them. We consider in particular the use of fixed-flavor versus variable-flavor number renormalization schemes, higher twist corrections, and nuclear corrections. We perform our study in the framework of the NNPDF2.3 global PDF determination, by quantifying in each case the impact of different theoretical assumptions on the output PDFs. We also study in each case the implications for benchmark cross sections at the LHC. We find that the impact in a global fit of a fixed-flavor number scheme is substantial, the impact of higher twists is negligible, and the impact of nuclear corrections is moderate and circumscribed. (C) 2013 Elsevier B.V. All rights reserved.

AB - We study several sources of theoretical uncertainty in the determination of parton distributions (PDFs) which may affect current PDF sets used for precision physics at the Large Hadron Collider, and explain discrepancies between them. We consider in particular the use of fixed-flavor versus variable-flavor number renormalization schemes, higher twist corrections, and nuclear corrections. We perform our study in the framework of the NNPDF2.3 global PDF determination, by quantifying in each case the impact of different theoretical assumptions on the output PDFs. We also study in each case the implications for benchmark cross sections at the LHC. We find that the impact in a global fit of a fixed-flavor number scheme is substantial, the impact of higher twists is negligible, and the impact of nuclear corrections is moderate and circumscribed. (C) 2013 Elsevier B.V. All rights reserved.

KW - DEEP-INELASTIC SCATTERING

KW - HERA

U2 - 10.1016/j.physletb.2013.05.019

DO - 10.1016/j.physletb.2013.05.019

M3 - Article

SN - 0370-2693

VL - 723

SP - 330

EP - 339

JO - Physics Letters B

JF - Physics Letters B

IS - 4-5

ER -

Theoretical issues in PDF determination and associated uncertainties NNPDF Collaboration

Abstract

Keywords / Materials (for Non-textual outputs)

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Particle Theory at the Tait Institute

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