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Diffractive J/psi Photoproduction at Large |t| at HERA |
| Reference |
N.N., to be presented at ICHEP 2002, Summer 2002 |
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| Contact |
D.Brown,A.Meyer,P.Thompson |
| Abstract |
The diffractive production of the J/psi meson is measured at large four-momentum transfers squared (t) in photoproduction at HERA using data taken by the H1 detector during 1996-2000. The J/psi meson is identified via its decay into two unlike-sign muons. The cross section sigma(gamma p --> J/psi X) is measured as a function of |t| extending into the region of very large |t| > 10 GeV^2. The cross section is measured as a function of the photon-proton centre-of-mass energy W in three |t| intervals and as a function of |t| in two W intervals. The |t| dependence of the polarisation of the J/psi is presented. The results are compared with perturbative QCD calculations. |
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