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S. S. Wilks, The Large-Sample Distribution of the Likelihood Ratio for Testing Composite Hypotheses
1938
Earlier work this paper cites.
V. N. Gribov and L. N. Lipatov, Deep inelastic e p scattering in perturbation theory
1972
Earlier work this paper cites.
Y. L. Dokshitzer Sov. Phys. JETP
1977
Earlier work this paper cites.
G. Altarelli and G. Parisi, Asymptotic Freedom in Parton Language
1977
Earlier work this paper cites.
R. K. Ellis, W. J. Stirling, and B. R. Webber, QCD and collider physics
1996
Earlier work this paper cites.
J. Pumplin et al., Uncertainties of predictions from parton distribution functions. 2. The Hessian method
2001
Earlier work this paper cites.
A. D. Martin, R. G. Roberts, W. J. Stirling, and R. S. Thorne, Parton distributions incorporating QED contributions
2005
Earlier work this paper cites.
T. Carli, D. Clements, A. Cooper-Sarkar, C. Gwenlan, G. P. Salam, F. Siegert, P. Starovoitov, and M. Sutton, A posteriori inclusion of parton density functions in NLO QCD final-state calculations at hadron colliders: The APPLGRID Project
Original
2010
Earlier work this paper cites.
S. Forte, E. Laenen, P. Nason, and J. Rojo, Heavy quarks in deep-inelastic scattering
Original
2010
Earlier work this paper cites.
S. Dittmaier and M. Huber, Radiative corrections to the neutral-current Drell-Yan process in the Standard Model and its minimal supersymmetric extension
Original
2010
Earlier work this paper cites.

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Then

S. Alekhin et al., HERAFitter
Original
2015
Later among the works it cites.
ZEUS, H1
Original
2015
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L. A. Harland-Lang, A. D. Martin, P. Motylinski, and R. S. Thorne, Parton distributions in the LHC era: MMHT 2014 PDFs
Original
2015
Later among the works it cites.
A. Buckley, J. Ferrando, S. Lloyd, K. Nordstrom, B. Page, et al., LHAPDF6: parton density access in the LHC precision era
Original
2015
Later among the works it cites.
V. Bertone, S. Carrazza, D. Pagani, and M. Zaro, On the Impact of Lepton PDFs
Original
2015

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2017

The photon PDF from high-mass Drell Yan data at the LHC

Giuli, F., team, xFitter Developers', : et al.

Understand

Achieving the highest precision for theoretical predictions at the LHC requires the calculation of hard-scattering cross-sections that include perturbative QCD corrections up to (N)NNLO and electroweak (EW) corrections up to NLO.

Parton distribution functions (PDFs) need to be provided with matching accuracy, which in the case of QED effects involves introducing the photon parton distribution of the proton, $x\gamma(x,Q^2)$.
In this work a determination of the photon PDF from fits to recent ATLAS measurements of high-mass Drell-Yan dilepton production at $\sqrt{s}=8$ TeV is presented.
This analysis is based on the xFitter framework, and has required improvements both in the APFEL program, to account for NLO QED effects, and in the aMCfast interface to account for the photon-initiated contributions in the EW calculations within MadGraph5_aMC@NLO.

Built on

S. S. Wilks, The Large-Sample Distribution of the Likelihood Ratio for Testing Composite Hypotheses
1938
Earlier work this paper cites.
V. N. Gribov and L. N. Lipatov, Deep inelastic e p scattering in perturbation theory
1972
Earlier work this paper cites.
Y. L. Dokshitzer Sov. Phys. JETP
1977
Earlier work this paper cites.
G. Altarelli and G. Parisi, Asymptotic Freedom in Parton Language
1977
Earlier work this paper cites.
R. K. Ellis, W. J. Stirling, and B. R. Webber, QCD and collider physics
1996
Earlier work this paper cites.
J. Pumplin et al., Uncertainties of predictions from parton distribution functions. 2. The Hessian method
2001
Earlier work this paper cites.
A. D. Martin, R. G. Roberts, W. J. Stirling, and R. S. Thorne, Parton distributions incorporating QED contributions
2005
Earlier work this paper cites.
T. Carli, D. Clements, A. Cooper-Sarkar, C. Gwenlan, G. P. Salam, F. Siegert, P. Starovoitov, and M. Sutton, A posteriori inclusion of parton density functions in NLO QCD final-state calculations at hadron colliders: The APPLGRID Project
Original
2010
Earlier work this paper cites.
S. Forte, E. Laenen, P. Nason, and J. Rojo, Heavy quarks in deep-inelastic scattering
Original
2010
Earlier work this paper cites.
S. Dittmaier and M. Huber, Radiative corrections to the neutral-current Drell-Yan process in the Standard Model and its minimal supersymmetric extension
Original
2010
Earlier work this paper cites.