Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2010-07-18
Physics
High Energy Physics
High Energy Physics - Experiment
15 Pages, 14 figures. Proceedings for the LCWS 2010 workshop, Beijing, China, Mars 2010
Scientific paper
A brief overview of the linear collider design is given, with emphasis on the elements of particular importance for the performance. The modifications of the RDR design suggested in the SB2009 proposal are presented, once again with emphasis on those item that have most impact on the performance. In particular, the effects on New Physics channels are studied, by two examples: the analysis of the properties of $\stau$:s in the SUSY benchmark point SPS1a', and the model-independent Higgs recoil mass analysis. It is shown that for both these cases, the SB2009 design performs significantly worse than the RDR design: For the \stau ~analysis, the uncertainties on both the mass and cross-section determination increases by 20 \% (or 35 \% if the travelling focus concept is not deployed). For the Higgs analysis, the corresponding increase in uncertainty is found to be 70 \% both for cross-section and mass (or 100 \% without travelling focus). For both channels, the deterioration is to a large part due to the move of the positron source to the end of the linac.
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