Measurement of diffractive scattering of photons with large momentum transfer at HERA
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The first measurement of diffractive scattering of quasi-real photons with large momentum transfer gamma p - GT 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) LT 0.01 GeV(2). Single differential cross sections are Measured as a function of W, the incident photon-proton centre of mass energy, and t, the square of the four-momentum transferred at the proton vertex, in the range 175 LT W LT 247 GeV and 4 LT |t| LT 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. (C) 2009 Published by Elsevier B.V.
Извор:Physics Letters B, 2009, 672, 3, 219-226
- European Social Fund, National Resources, Bundesministerium fur Bildung und Forschung, FRG [05 H1 1GUA/1, 05 H1 1PAA/1, 05 H1 1PAB/9, 05 H1 1PEA/6, 05 HI 1VHA/7, 05 H1 1VHB/5], UK Science and Technology Facilities Council, UK Particle Physics and Astronomy Research Council, FNRS-FWO-Vlaanderen, IISN-IIKW, IWT, Interuniversity Attraction Poles Programme, Belgian Science Policy, Polish Ministry of Science and Higher Education [PBSIDESY/70/2006], VEGA SR [2/7062/27], Swedish Natural Science Research Council, CONACYT [48778-F], Deutsche Forschungsgemeinschaft, Ministry of Education of the Czech Republic [LC527, INGO-IP05LA259], Swiss National Science Foundation