Parton distributions with LHC data

Richard D. Ball, Valerio Bertone, Stefano Carrazza, Christopher S. Deans, Luigi Del Debbio, Stefano Forte, Alberto Guffanti, Nathan P. Hartland, Jose I. Latorre, Juan Rojo, Maria Ubiali

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

We present the first determination of parton distributions of the nucleon at NLO and NNLO based on a global data set which includes LHC data: NNPDF2.3. Our data set includes, besides the deep inelastic, Drell-Yan, gauge boson production and jet data already used in previous global PDF determinations, all the relevant LHC data for which experimental systematic uncertainties are currently available: ATLAS and LHCb W and Z lepton rapidity distributions from the 2010 run, CMS W electron asymmetry data from the 2011 run, and ATLAS inclusive jet cross-sections from the 2010 run. We introduce an improved implementation of the FastKernel method which allows us to fit to this extended data set, and also to adopt a more effective minimization methodology. We present the NNPDF2.3 PDF sets, and compare them to the NNPDF2.1 sets to assess the impact of the LHC data. We find that all the LHC data are broadly consistent with each other and with all the older data sets included in the fit. We present predictions for various standard candle cross-sections, and compare them to those obtained previously using NNPDF2.1, and specifically discuss the impact of ATLAS electroweak data on the determination of the strangeness fraction of the proton. We also present collider PDF sets, constructed using only data from HERA, Tevatron and LHC, but find that this data set is neither precise nor complete enough for a competitive PDF determination.
Original languageEnglish
Pages (from-to)244-289
JournalNuclear Physics B
Volume867
Issue number2
DOIs
Publication statusPublished - 11 Feb 2013

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partons
strangeness
cross sections
leptons
bosons
asymmetry
methodology
optimization
protons
predictions
electrons

Bibliographical note

56 pages, 30 figures. LHCb dataset updated, all tables and plots recomputed accordingly (results essentially unchanged). Several typos corrected, several small textual improvements and clarifications

Keywords

  • hep-ph

Cite this

Ball, R. D., Bertone, V., Carrazza, S., Deans, C. S., Debbio, L. D., Forte, S., ... Ubiali, M. (2013). Parton distributions with LHC data. Nuclear Physics B, 867(2), 244-289. https://doi.org/10.1016/j.nuclphysb.2012.10.003
Ball, Richard D. ; Bertone, Valerio ; Carrazza, Stefano ; Deans, Christopher S. ; Debbio, Luigi Del ; Forte, Stefano ; Guffanti, Alberto ; Hartland, Nathan P. ; Latorre, Jose I. ; Rojo, Juan ; Ubiali, Maria. / Parton distributions with LHC data. In: Nuclear Physics B. 2013 ; Vol. 867, No. 2. pp. 244-289.
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Ball, RD, Bertone, V, Carrazza, S, Deans, CS, Debbio, LD, Forte, S, Guffanti, A, Hartland, NP, Latorre, JI, Rojo, J & Ubiali, M 2013, 'Parton distributions with LHC data' Nuclear Physics B, vol. 867, no. 2, pp. 244-289. https://doi.org/10.1016/j.nuclphysb.2012.10.003

Parton distributions with LHC data. / Ball, Richard D.; Bertone, Valerio; Carrazza, Stefano; Deans, Christopher S.; Debbio, Luigi Del; Forte, Stefano; Guffanti, Alberto; Hartland, Nathan P.; Latorre, Jose I.; Rojo, Juan; Ubiali, Maria.

In: Nuclear Physics B, Vol. 867, No. 2, 11.02.2013, p. 244-289.

Research output: Contribution to JournalArticleAcademicpeer-review

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AU - Ball, Richard D.

AU - Bertone, Valerio

AU - Carrazza, Stefano

AU - Deans, Christopher S.

AU - Debbio, Luigi Del

AU - Forte, Stefano

AU - Guffanti, Alberto

AU - Hartland, Nathan P.

AU - Latorre, Jose I.

AU - Rojo, Juan

AU - Ubiali, Maria

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N2 - We present the first determination of parton distributions of the nucleon at NLO and NNLO based on a global data set which includes LHC data: NNPDF2.3. Our data set includes, besides the deep inelastic, Drell-Yan, gauge boson production and jet data already used in previous global PDF determinations, all the relevant LHC data for which experimental systematic uncertainties are currently available: ATLAS and LHCb W and Z lepton rapidity distributions from the 2010 run, CMS W electron asymmetry data from the 2011 run, and ATLAS inclusive jet cross-sections from the 2010 run. We introduce an improved implementation of the FastKernel method which allows us to fit to this extended data set, and also to adopt a more effective minimization methodology. We present the NNPDF2.3 PDF sets, and compare them to the NNPDF2.1 sets to assess the impact of the LHC data. We find that all the LHC data are broadly consistent with each other and with all the older data sets included in the fit. We present predictions for various standard candle cross-sections, and compare them to those obtained previously using NNPDF2.1, and specifically discuss the impact of ATLAS electroweak data on the determination of the strangeness fraction of the proton. We also present collider PDF sets, constructed using only data from HERA, Tevatron and LHC, but find that this data set is neither precise nor complete enough for a competitive PDF determination.

AB - We present the first determination of parton distributions of the nucleon at NLO and NNLO based on a global data set which includes LHC data: NNPDF2.3. Our data set includes, besides the deep inelastic, Drell-Yan, gauge boson production and jet data already used in previous global PDF determinations, all the relevant LHC data for which experimental systematic uncertainties are currently available: ATLAS and LHCb W and Z lepton rapidity distributions from the 2010 run, CMS W electron asymmetry data from the 2011 run, and ATLAS inclusive jet cross-sections from the 2010 run. We introduce an improved implementation of the FastKernel method which allows us to fit to this extended data set, and also to adopt a more effective minimization methodology. We present the NNPDF2.3 PDF sets, and compare them to the NNPDF2.1 sets to assess the impact of the LHC data. We find that all the LHC data are broadly consistent with each other and with all the older data sets included in the fit. We present predictions for various standard candle cross-sections, and compare them to those obtained previously using NNPDF2.1, and specifically discuss the impact of ATLAS electroweak data on the determination of the strangeness fraction of the proton. We also present collider PDF sets, constructed using only data from HERA, Tevatron and LHC, but find that this data set is neither precise nor complete enough for a competitive PDF determination.

KW - hep-ph

U2 - 10.1016/j.nuclphysb.2012.10.003

DO - 10.1016/j.nuclphysb.2012.10.003

M3 - Article

VL - 867

SP - 244

EP - 289

JO - Nuclear Physics B

JF - Nuclear Physics B

SN - 0550-3213

IS - 2

ER -

Ball RD, Bertone V, Carrazza S, Deans CS, Debbio LD, Forte S et al. Parton distributions with LHC data. Nuclear Physics B. 2013 Feb 11;867(2):244-289. https://doi.org/10.1016/j.nuclphysb.2012.10.003