Leptons in the Proton

Understand

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).

• It has been shown recently that the photon PDF can be given in terms of the structure functions and form factors for electron-proton scattering.
• The same holds for lepton PDFs.
• In the present work we set up a calculation of the lepton PDFs at next-to-leading order, using the same data input needed in the photon case.