Orateur
Dr
Gavin Salam
(CERN)
Description
The photon distribution inside the proton affects a wide variety of LHC processes. In the past couple of years it emerged that our limited understanding of this distribution was the dominant uncertainty in a number of searches and certain precision Higgs predictions, notably Higgs boson production in association with a $W$ boson.
This talk shows how the photon distribution can be related to electron-proton ($ep$) scattering. Normally one views $ep$ scattering as involving an electron that emits a photon, with that photon then probing the proton. However the same process can equally well be interpreted as an electron scattering off the photon field of the proton. Thanks to a wealth of existing high-precision $ep$ data, it turns out that the photon distribution can be constrained at the level of $1{-}2\%$ accuracy, almost two orders of magnitude better than in earlier model-independent determinations.
Authors
Prof.
Aneesh Manohar
(University of California, San Diego)
Dr
Gavin Salam
(CERN)
Giulia Zanderighi
(University of Oxford)
Paolo Nason
(infn)
