2008/10/31 by F. D. Aaron, H1 Collaboration, C. Alexa +98
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1016/j.physletb.2009.01.019
published as Phys.Lett.B672:219-226,2009 · 17 pages, accepted by PLB, revised version
openalex publication_date 2009/01/17 · arxiv created 2009/01/21 · arxiv updated 2012/08/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04
The first measurement of diffractive scattering of quasi-real photons with large momentum transfer γ p → γ 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 . 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 < 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.