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Exclusive photoproduction of Photons at Large |t| |
| Reference |
Preliminary results expected for EPS03, Summer 2003 |
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| Contact |
Matthew Beckingham |
| Abstract |
The process gamma p -> \gamma X in which the outgoing photon has transverse momentum p_T^gamma > 2 GeV and there is a large rapidity gap between the proton dissociative system X and the outgoing photon is studied with the H1 detector at HERA. Cross sections are measured as functions of the photon transverse momentum, p_T^gamma, the gamma p centre of mass energy W and x_pom = (E+p_z)_gamma / 2E_p, where E_p is the incoming proton energy. The cross section rises steeply with increasing W, as would be expected from a hard diffractive process. All measured cross sections are consistent with a perturbative QCD model calculated using the leading logarithmic approximation of BFKL. |
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