How bright is the proton? A precise determination of the photon parton distribution function - INSPIRE

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How bright is the proton? A precise determination of the photon parton distribution function

Aneesh Manohar
(
- CERN and
- UC, San Diego
)
,
Paolo Nason
(
- INFN, Milan Bicocca
)
,
Gavin P. Salam
(
- CERN
)
,
Giulia Zanderighi
(
- CERN and
- Oxford U., Theor. Phys.
)

Jul 14, 2016

6 pages

Published in:

Phys.Rev.Lett. 117 (2016) 24, 242002

Published: Dec 9, 2016

e-Print:

1607.04266 [hep-ph]

DOI:

10.1103/PhysRevLett.117.242002

Report number:

CERN-TH-2016-155

View in:

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Abstract: (APS)

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 the Standard Model process with a flavor changing photon-lepton vertex. We write its cross section in two ways: one in terms of proton structure functions, the other in terms of a photon distribution. Requiring their equivalence yields the photon distribution as an integral over proton structure functions. As a result of the good precision of ep data, we constrain the photon PDF at the level of 1%–2% over a wide range of momentum fractions.

Note:

6 pages, 5 figures; v3 includes small textual changes and an updated CT14 comparison in Fig. 4, as published. LUXqed_PDF4LHC15_nnlo_100 set available from LHAPDF, further information at http://cern.ch/luxqed/

electron p: scattering
electron p: interaction
interaction: flavor changing
p: structure function
parton: distribution function
photon: distribution function
photon: yield

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