Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-03-13
Physics
High Energy Physics
High Energy Physics - Experiment
Presented at EPS International Europhysics Conference on High Energy Physics (HEP-EPS 2005), Lisbon, Portugal, 21-27 Jul 2005
Scientific paper
Recent results on the properties of the hadronic final state at the HERA collider are presented. Strangeness production and correlations have been studied in the laboratory system for deep inelastic scattering (DIS). Inclusive $K^0_S$, $\Lambda$ and $\bar{\Lambda}$ production has been measured and compared to Monte Carlo model calculations. No significant $\Lambda$ to $\bar{\Lambda}$ production asymmetry was observed and the measured $\Lambda (\bar{\Lambda})$ polarisations are consistent with zero. Bose-Einstein correlations between charged and neutral kaons have been studied and the obtained results are compared with the LEP measurements. A search for heavy particles was performed in the photoproduction process. The cross section for anti-deuteron production has been measured at a mean center-of-mass energy of $W_{\gamma p}$ = 200 GeV. The azimuthal angle distribution of hadrons in DIS has also been studied in the hadronic center-of-mass system. The measurements of the azimuthal asymmetry are consistent with the perturbative QCD predictions.
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