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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:
 [1];  [2]; ORCiD logo [3];  [4]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. VU Univ., Amsterdam (The Netherlands); Nikhef Theory Group, Amsterdam (The Netherlands)
  3. Univ. of Oxford, Oxford (United Kingdom)
  4. The State Univ. of New York, Buffalo, NY (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
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; 1654351; TRN: US1801593
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Published Article
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 78; Journal Issue: 6; Journal ID: ISSN 1434-6044
Publisher:
Springer
Country of Publication:
United States
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. United States: N. p., 2018. Web. doi:10.1140/epjc/s10052-018-5944-4.
Campbell, John M., Rojo, Juan, Slade, Emma, & Williams, Ciaran. Direct photon production and PDF fits reloaded. United States. doi:10.1140/epjc/s10052-018-5944-4.
Campbell, John M., Rojo, Juan, Slade, Emma, and Williams, Ciaran. Sat . "Direct photon production and PDF fits reloaded". United States. doi:10.1140/epjc/s10052-018-5944-4.
@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 = {United States},
year = {2018},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1140/epjc/s10052-018-5944-4

Citation Metrics:
Cited by: 7 works
Citation information provided by
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    Works referencing / citing this record:

    Towards ultimate parton distributions at the high-luminosity LHC
    journal, November 2018