Measurement of Diffractive Scattering of Photons with Large Momentum Transfer at HERA

Details Measurement of Diffractive Scattering of Photons with Large Momentum Transfer at HERA Measurement of Diffractive Scattering of Photons with Large Momentum Transfer at HERA

2008-10-17

arxiv.org/abs/0810.3096v2

Phys.Lett.B672:219-226,2009

Physics

High Energy Physics

High Energy Physics - Experiment

17 pages, accepted by PLB, revised version

Scientific paper

10.1016/j.physletb.2009.01.019

The first measurement of diffractive scattering of quasi-real photons with large momentum transfer gamma p -> gamma Y, where Y is the proton dissociative system, is made using the H1 detector at HERA. The measurement is performed for initial photon virtualities Q^2 < 0.01 GeV^2. Cross sections are measured as a function of W, the incident photon-proton entre of mass energy, and t, the square of the four-momentum transferred at the proton vertex, in the range 175 < W < 247 GeV and 4<|t|<36 GeV^2. The W dependence is well described by a model based on perturbative QCD using a leading logarithmic approximation of the BFKL evolution. The measured |t| dependence is harder than that predicted by the model and those observed in exclusive vector meson production.

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