Combined Partial Wave Analysis for the description of exclusive p+p→p+K++Λp+p \to p + K^+ + \Lambda production

The production of p K+ {\Lambda} in elementary p + p collision was investigated using the Bonn Gatchina Partial Wave Analysis framework. This approach allows the determination of possible participating production wave depending on the quantum numbers of the system. For the analysis seven data samples, measured at different detectors and beam energies, were used.For the extraction of the p{\Lambda} scattering length a cross check with established methods is required. Furthermore the total cross section of the production process is needed to be determined to extra cross section for the separate waves. Both methods are described in this work.Comment: 4 pages, 2 figure

Interpretation of transverse tune spectra in a heavy-ion synchrotron at high intensities

Two different tune measurement systems have been installed in the GSI heavy-ion synchrotron SIS-18. Tune spectra are obtained with high accuracy using these fast and sensitive systems. Besides the machine tune, the spectra contain information about the intensity dependent coherent tune shift and the incoherent space charge tune shift. The space charge tune shift is derived from a fit of the observed shifted positions of the synchrotron satellites to an analytic expression for the head-tail eigenmodes with space charge. Furthermore, the chromaticity is extracted from the measured head-tail mode structure. The results of the measurements provide experimental evidence of the importance of space charge effects and head-tail modes for the interpretation of transverse beam signals at high intensity