Inclusive resonance production in electron-proton collisions at HERA
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Abstract: (McGill U., Montreal (main))
At the HERA particle accelerator, 27.5 GeV electrons collide with 920 GeV protons. Photoproduction events, in which the quasi real photon emitted from the electron interacts with the proton with small momentum transfer, are dominant by 90% of the data sample. K0S-K0S candidate pairs, which might couple to glueballs, are selected and studied with the ZEUS detector in the photon-proton center-of-mass range 130 GeV < W_gamma_p < 270 GeV using the entire data luminosity of 0.5 fb^-1. Enhancements attributed to the production of f2(1270)/a02(1320), f'2(1525) and f0(1710) are observed in the K0S-K0S invariant mass spectrum. A coherent fit, which has taken into account the interference effects by SU(3) symmetry argument, provides precise measurement values on mass and width of the states. It gives a five standard deviation enhancement on state f0(1710) in terms of statistical significance. This is by far the best measurement in e-p collision experiments, and is consistent with results from other experiments and the world averages. Furthermore, spin analysis on the glueball candidate f0(1710) are performed as an approach to reveal the glueball content of the meson state. However, due to the complicated background condition, the angular distribution method and the partial wave analysis are undetermined and fail to give a positive result on the spin.- thesis
- resonance: production
- f2(1270): production
- interference: effect
- symmetry: SU(3)
- glueball
- f0(1710)
- f2(1525)
- DESY HERA Stor
- electron p: scattering
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