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Title: A critical appraisal and evaluation of modern PDFs

Here, we review the present status in the determination of parton distribution functions (PDFs) in the light of the precision requirements for the LHC in Run 2 as well as other future colliders. We provide brief descriptions of all currently available PDF sets and use them to compute cross sections for a number of benchmark processes including the Higgs boson production in gluon-gluon fusion at the LHC. We show that the differences in the predictions obtained with the various PDFs are due to particular theory assumptions such as the heavy-flavor schemes used in the PDF fits, the account of power corrections and others. We comment on PDF uncertainties in the kinematic region covered by the LHC and on averaging procedures for PDFs, such as realized by the PDF4LHC15 sets. As a result, we provide recommendations for the usage of sets of PDFs for theory predictions at the LHC.
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [5] ;  [9] ;  [6] ;  [10] ;  [5]
  1. Hampton Univ., Hampton, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. Univ. Hamburg, Hamburg (Germany); Institute for High Energy Physics, Moscow region (Russia)
  3. Deutsches Elektronen-Synchrotron (DESY), Zeuthen (Germany)
  4. Univ. Hamburg, Hamburg (Germany)
  5. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  6. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  7. Institute for High Energy Physics, Moscow region (Russia)
  8. Florida State Univ., Tallahassee, FL (United States)
  9. Technische Univ. Dortmund, Dortmund (Germany)
  10. Univ. of Liverpool, Liverpool (United Kingdom)
Publication Date:
OSTI Identifier:
Report Number(s):
JLAB-THY-16-2231; DOE/OR/23177-3779
Journal ID: ISSN 1434-6044; PII: 4285
Grant/Contract Number:
05H15GUCC1; AC05-06OR23177; FG02-97ER41922; SC0008791; PITN-GA- 2012-316704 (HIGGSTOOLS)
Published Article
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 76; Journal Issue: 8; Journal ID: ISSN 1434-6044
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States