How Bright is the Proton? A Precise Determination of the Photon Parton Distribution Function.

  title={How Bright is the Proton? A Precise Determination of the Photon Parton Distribution Function.},
  author={Aneesh V. Manohar and Paolo Nason and Gavin P. Salam and Giulia Zanderighi},
  journal={Physical review letters},
  volume={117 24},
It has become apparent in recent years that it is important, notably for a range of physics studies at the Large Hadron Collider, to have accurate knowledge on the distribution of photons in the proton. We show how the photon parton distribution function (PDF) can be determined in a model-independent manner, using electron-proton (ep) scattering data, in effect viewing the ep→e+X process as an electron scattering off the photon field of the proton. To this end, we consider an imaginary, beyond… 

Figures from this paper

The photon content of the proton

A bstractThe photon PDF of the proton is needed for precision comparisons of LHC cross sections with theoretical predictions. In a recent paper, we showed how the photon PDF could be determined in

Illuminating the photon content of the proton within a global PDF analysis

Precision phenomenology at the LHC requires accounting for both higher-order QCD and electroweak corrections as well as for photon-initiated subprocesses. Building upon the recent NNPDF3.1 fit, in

The proton in high definition: revisiting photon-initiated production in high energy collisions

We re-examine the current state of the art for the calculation of photon- initiated processes at the LHC, as formulated in terms of a photon PDF in the proton that may be determined rather precisely

Leptons in the proton

As is the case for all light coloured Standard Model particles, also photons and charged leptons appear as constituents in ultrarelativistic hadron beams, and admit a parton density function (PDF).

Implications of CMS analysis of photon-photon interactions for photon PDFs

As part of a recent analysis of exclusive two-photon production of W+W− pairs at the LHC, the CMS experiment used di-lepton data to obtain an “effective” photon-photon luminosity. We show how the CMS

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

  • F. GiuliV. D. S. A. A. K. A. F. R. V. J. R. P. O. M. Bertone Britzger Carrazza Cooper-Sarkar Glazov Loh M. Lisovyi
  • Physics
    The European physical journal. C, Particles and fields
  • 2017
A determination of the photon PDF from fits to recent ATLAS measurements of high-mass Drell–Yan dilepton production at s=8 TeV is presented, and consistent results are found.

Probing the photonic content of the proton using photon-induced dilepton production in p+Pb collisions at the LHC

We propose a new experimental method to probe the photon parton distribution function inside the proton (photon PDF) at LHC energies. The method is based on the measurement of dilepton production



The ZEUS Collaboration

Collective behaviour of final-state hadrons, and multiparton interactions are studied in high-multiplicity ep scattering at a centre-of-mass energy √ s = 318GeV with the ZEUS detector at HERA. Twoand

Search for resonances decaying to photon pairs in 3.2 fb−1 of pp collisions at s=13 TeV with the ATLAS detector.

This proceedings summarises the search for resonances decaying into two photons with a mass greater than 200 GeV. Models, which have scalars, such as the extended Higgs sector are used to optimise

Search for new physics in high mass diphoton events in proton-proton collisions at s = 13 TeV

  • Physics
  • 2015
We report on a search for new physics using high mass diphoton events. The search employs 2.6 fb−1 of pp collision data collected by the CMS experiment in 2015 at a center-of-mass energy of 13 TeV


in 24th International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS 2016) Hamburg

  • Germany, April 11-15, 2016
  • 2016


I and J


  • Phys. J. C75, 132
  • 2015


  • Phys. Commun. 70, 97
  • 1992