Measurement of the photon proton total cross-section at a center-of-mass energy of 209-GeV at HERA

The photon–proton total cross section has been measured in the process e + p → e + γp → e + X with the ZEUS detector at HERA. Events were collected with photon virtuality Q 2 <0.02 GeV 2 and average γp center-of-mass energy W γp =209 GeV in a dedicated run, designed to control systematic effects, with an integrated luminosity of 49 nb −1 . The measured total cross section is σ tot γp =174±1 (stat.)±13 (syst.) μb. The energy dependence of the cross section is compatible with parameterizations of high-energy pp and p p ̄ data.

Note:

21 pages, 8 figures, accepted by Nuclear Physics B Report-no: DESY-01-216

positron p: colliding beams
photon p: interaction
hadron: multiple production
total cross section: energy dependence
radiative correction
ZEUS
experimental results
DESY HERA Stor
209 GeV-cms

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