Structure of Real and Virtual Photons from ZEUS
N. Macdonald
TL;DR
This paper presents measurements of real and virtual photon structures from ZEUS, revealing discrepancies with existing photon PDFs and showing the decline of photon structure with increasing virtuality, emphasizing the need for resolved photon processes.
Contribution
It provides new experimental data on photon structure functions and tests various photon PDFs against these measurements, highlighting their limitations.
Findings
Photon PDFs tend to underestimate the data for real photons.
Photon structure decreases as virtuality increases.
Resolved photon processes are necessary up to 4.5 GeV^2 virtuality.
Abstract
Measurements sensitive to the structure of both real and virtual photons are presented and compared to theoretical models with various photon parton distribution functions (PDFs). Measurements for real photons show a tendency for the available photon PDFs to be too small to describe the data. For virtual photons, the photon PDF is seen to decrease with increasing photon virtuality. In order to describe the data, resolved photon processes are required up to a photon virtuality of at least 4.5 GeV^2.
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