Measurement of photon production in the very forward direction in deep-inelastic scattering at HERA
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The production of photons at very small angles with respect to the proton beam direction is studied in deep-inelastic positron-proton scattering at HERA. The data are taken with the H1 detector in the years 2006 and 2007 and correspond to an integrated luminosity of 126 pb(-1). The analysis covers the range of negative four momentum transfer squared at the positron vertex 6 LT Q(2) LT 100 GeV2 and inelasticity 0.05 LT y LT 0.6. Cross sections are measured for the most energetic photon with pseudorapidity eta GT 7.9 as a function of its transverse momentum p(T)(lead) and longitudinal momentum fraction of the incoming proton x(L)(lead). In addition, the cross sections are studied as a function of the sum of the longitudinal momentum fraction x(L)(sum) L of all photons in the pseudorapidity range. GT 7.9. The cross sections are normalised to the inclusive deep-inelastic scattering cross section and compared to the predictions of models of deep-inelastic scattering and models of the hadron...ic interactions of high energy cosmic rays.
Извор:European Physical Journal C. Particles and Fields, 2011, 71, 10
- Helmholtz Association (HGF) [VH-NG-401], Bundesministerium fur Bildung und Forschung, FRG [05H09GUF, 05H09VHC, 05H09VHF, 05H16PEA], UK Science and Technology Facilities Council, FNRS-FWO-Vlaanderen, IISN-IIKW, IWT, Belgian Science Policy, Polish Ministry of Science and Higher Education [DPN/N168/DESY/2009], Deutsche Forschungsgemeinschaft, VEGA SR [2/7062/27], Swedish Natural Science Research Council, Ministry of Education of the Czech Republic, Swiss National Science Foundation, CONACYT, Mexico [48778-F], Russian Foundation for Basic Research (RFBR) [1329.2008.2], European Social Fund, Romanian National Authority for Scientific Research [PN 09370101], Ministry of Science of Montenegro [051/3-3352]