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Photoproduction of Psi(2S) in Diffraction at HERA |
| Reference |
N.N., to be presented at DIS 2002, Spring 2002 |
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| Contact |
A.Meyer |
| Abstract |
Results on elastic and proton dissociative photoproduction of psi(2s) mesons are presented using data corresponding to a luminosity of 77 pb^-1 collected between 1996 and 2000 with the H1 detector at the HERA collider. The photoproduction cross sections sigma(gamma p -> psi X) are measured as a function of the four-momentum transfer squared -t at the proton vertex and as a function of the photon proton center-of-mass energy W_(gamma p) in the kinematic region 40 < W_(gamma p) < 150 GeV. The |t| dependences of diffractive psi(2S) photoproduction, parametrized as e^(-bt) are found to be b = (4.63 +-0.55 +-0.55) GeV^-2 for the elastic and b = (0.69 +-0.12 +-0.30) GeV^-2 for the proton dissociative channel. These values of b are somewhat smaller than those for J/psi production although the difference is within the systematic errors. The W_(gamma p) dependence of the elastic psi(2S) photoproduction cross section is found to be equal or slightly steeper than that for J/psi. The results are compared with perturbative QCD calculations. |
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