Direct photon production and PDF fits reloaded

Campbell, John M.; Rojo, Juan; Slade, Emma; Williams, Ciaran

doi:10.1140/epjc/s10052-018-5944-4

Title: Direct photon production and PDF fits reloaded

Abstract

Direct photon production in hadronic collisions provides a handle on the gluon PDF by means of the QCD Compton scattering process. In this work we revisit the impact of direct photon production on a global PDF analysis, motivated by the recent availability of the next-to-next-to-leading (NNLO) calculation for this process. We demonstrate that the inclusion of NNLO QCD and leading-logarithmic electroweak corrections leads to a good quantitative agreement with the ATLAS measurements at 8 and 13 TeV, except for the most forward rapidity region in the former case. By including the ATLAS 8 TeV direct photon production data in the NNPDF3.1 NNLO global analysis, we assess its impact on the medium-x gluon. We also study the constraining power of the direct photon production measurements on PDF fits based on different datasets, in particular on the NNPDF3.1 no-LHC and collider-only fits. Here, we also present updated NNLO theoretical predictions for direct photon production at 13 TeV that include the constraints from the 8 TeV measurements.

Authors:

Campbell, John M.; Rojo, Juan;

; Williams, Ciaran

Publication Date:: Sat Jun 09 00:00:00 EDT 2018

Research Org.:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP)

OSTI Identifier:: 1441089

Alternate Identifier(s):: OSTI ID: 1422193

Report Number(s):: FERMILAB-PUB-18-018-T; Nikhef/2017-068; OUTP-17-16P; NIKHEF-2017-068; arXiv:1802.03021
Journal ID: ISSN 1434-6044; 470; PII: 5944

Grant/Contract Number:: AC02-07CH11359

Resource Type:: Published Article

Journal Name:: European Physical Journal. C, Particles and Fields

Additional Journal Information:: Journal Name: European Physical Journal. C, Particles and Fields Journal Volume: 78 Journal Issue: 6; Journal ID: ISSN 1434-6044

Publisher:: Springer Science + Business Media

Country of Publication:: Germany

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats


                    Campbell, John M., Rojo, Juan, Slade, Emma, and Williams, Ciaran. Direct photon production and PDF fits reloaded.  Germany: N. p., 2018. 
Web.  doi:10.1140/epjc/s10052-018-5944-4.

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                    Campbell, John M., Rojo, Juan, Slade, Emma, & Williams, Ciaran. Direct photon production and PDF fits reloaded.  Germany.  https://doi.org/10.1140/epjc/s10052-018-5944-4

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                    Campbell, John M., Rojo, Juan, Slade, Emma, and Williams, Ciaran. Sat .  
"Direct photon production and PDF fits reloaded".  Germany.  https://doi.org/10.1140/epjc/s10052-018-5944-4.

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@article{osti_1441089,

  title        = {Direct photon production and PDF fits reloaded},

  author       = {Campbell, John M. and Rojo, Juan and Slade, Emma and Williams, Ciaran},

  abstractNote = {Direct photon production in hadronic collisions provides a handle on the gluon PDF by means of the QCD Compton scattering process. In this work we revisit the impact of direct photon production on a global PDF analysis, motivated by the recent availability of the next-to-next-to-leading (NNLO) calculation for this process. We demonstrate that the inclusion of NNLO QCD and leading-logarithmic electroweak corrections leads to a good quantitative agreement with the ATLAS measurements at 8 and 13 TeV, except for the most forward rapidity region in the former case. By including the ATLAS 8 TeV direct photon production data in the NNPDF3.1 NNLO global analysis, we assess its impact on the medium-x gluon. We also study the constraining power of the direct photon production measurements on PDF fits based on different datasets, in particular on the NNPDF3.1 no-LHC and collider-only fits. Here, we also present updated NNLO theoretical predictions for direct photon production at 13 TeV that include the constraints from the 8 TeV measurements.},

  doi          = {10.1140/epjc/s10052-018-5944-4},

  journal      = {European Physical Journal. C, Particles and Fields},

  number       = 6,

  volume       = 78,

  place        = {Germany},

  year         = {Sat Jun 09 00:00:00 EDT 2018},

  month        = {Sat Jun 09 00:00:00 EDT 2018}

}

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Similar Records

Title: Direct photon production and PDF fits reloaded

Abstract

Citation Formats

Cross section ratios between different CM energies at the LHC: opportunities for precision measurements and BSM sensitivity journal, August 2012

Sensitivity of isolated photon production at TeV hadron colliders to the gluon distribution in the proton journal, July 2010

Isolated photons in perturbative QCD journal, June 1998

Parton distribution benchmarking with LHC data journal, April 2013

Parton densities from deep inelastic scattering to hadronic processes at super collider energies journal, March 1988

Electroweak Sudakov effects in W , Z and γ production at large transverse momentum journal, July 2013

A posteriori inclusion of parton density functions in NLO QCD final-state calculations at hadron colliders: the APPLGRID project journal, February 2010

A Higher Order Perturbative Parton Evolution Toolkit (HOPPET) journal, January 2009

Progress in the Determination of the Partonic Structure of the Proton journal, October 2013

LHAPDF6: parton density access in the LHC precision era journal, March 2015

Reweighting and unweighting of parton distributions and the LHC W lepton asymmetry data journal, February 2012

Parton distributions from a global QCD analysis of deep inelastic scattering and lepton-pair production journal, March 1991

Constraints on parton distributions and the strong coupling from LHC jet data journal, November 2015

Quantitative constraints on the gluon distribution function in the proton from collider isolated-photon data journal, July 2012

Quark and gluon fragmentation functions into photons journal, April 1998

Precision Measurement of the Prompt Photon Cross Section in p p ¯ Collisions at s = 1.8 TeV journal, November 1994

Measurement of the isolated prompt photon cross section in p ¯ p collisions at √ s =1.8 TeV journal, May 1992

Parton distributions in the LHC era: MMHT 2014 PDFs journal, May 2015

Driving missing data at next-to-leading order journal, December 2011

Parton distributions extracted from data on deep-inelastic lepton scattering, prompt photon production, and the Drell-Yan process journal, August 1990

Cross section ratios between different CM energies at the LHC: opportunities for precision measurements and BSM sensitivity
journal, August 2012

Sensitivity of isolated photon production at TeV hadron colliders to the gluon distribution in the proton
journal, July 2010

Isolated photons in perturbative QCD
journal, June 1998

Parton distribution benchmarking with LHC data
journal, April 2013

Parton densities from deep inelastic scattering to hadronic processes at super collider energies
journal, March 1988

Electroweak Sudakov effects in $W$ , $Z$ and $γ$ production at large transverse momentum
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A posteriori inclusion of parton density functions in NLO QCD final-state calculations at hadron colliders: the APPLGRID project
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journal, January 2009

Progress in the Determination of the Partonic Structure of the Proton
journal, October 2013

LHAPDF6: parton density access in the LHC precision era
journal, March 2015

Reweighting and unweighting of parton distributions and the LHC W lepton asymmetry data
journal, February 2012

Parton distributions from a global QCD analysis of deep inelastic scattering and lepton-pair production
journal, March 1991

Constraints on parton distributions and the strong coupling from LHC jet data
journal, November 2015

Quantitative constraints on the gluon distribution function in the proton from collider isolated-photon data
journal, July 2012

Quark and gluon fragmentation functions into photons
journal, April 1998

Precision Measurement of the Prompt Photon Cross Section in $p \bar{p}$ Collisions at $\sqrt{s} = 1.8$ TeV
journal, November 1994

Measurement of the isolated prompt photon cross section in p ¯ p collisions at √ s =1.8 TeV
journal, May 1992

Parton distributions in the LHC era: MMHT 2014 PDFs
journal, May 2015

Driving missing data at next-to-leading order
journal, December 2011

Parton distributions extracted from data on deep-inelastic lepton scattering, prompt photon production, and the Drell-Yan process
journal, August 1990