Understanding Light: Why we need a terascale photon collider

Details Understanding Light: Why we need a terascale photon collider Understanding Light: Why we need a terascale photon collider

2005-09-01

arxiv.org/abs/hep-ph/0509012v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pgs, 3 ps figures, to appear in the proceedings of the 2005 International Linear Collider Physics and Detector Workshop, Sno

Scientific paper

We do not understand light. I argue that a terascale photon collider is necessary to determine the structure of the photon at 100 GeV. Uncertainties in photon parton distribution functions lead to cross section predictions that vary by a factor of 5. This limits our ability to predict how well we can perform precision measurements, e.g., extracting the width of Higgs into two photons. These uncertainties will only be resolved by measuring the gluonic structure of the photon in situ.

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