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Measurement of Charm and Beauty Photoproduction at HERA using Inclusive Lifetime Tagging |
| Reference |
A Meyer, presented at ICHEP2004, Summer 2004 |
| Document |
Conference paper
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| Contact |
L Finke, A Meyer |
| Abstract |
A measurement of the charm and beauty photoproduction cross section at the ep collider HERA is presented. The data were collected in the years 1999 and 2000 and correspond to an integrated luminosity of 57.7 pb^-1. Events are selected with two or more jets with large transverse momentum, p_t^jet_1(2) > 11 (8) GeV, in the central rapidity range, -0.88 < eta^jet < 1.3. The lifetime signature of c and b-flavoured hadrons is exploited to determine the fraction of events in the sample containing charm or beauty. Differential cross sections as a function of the jet transverse momentum, the rapidity and x_gamma^obs are measured in the photoproduction region Q^2 <1 GeV^2, with inelasticity 0.15 < y <0.8. The results are compared with calculations in next-to-leading order perturbative QCD and Monte Carlo models as implemented in PYTHIA and CASCADE. |
| Comments | Results on charm were added for the DIS05 conference; the conference paper above has been updated to include these new results; results on beauty unchanged. |
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