• Authors:
  Daniela Bortoletto, Anadi Canepa, Sourabh Dube, Michael Gold, Martin Griffiths, Beate Heinemann, Else Lytken, Giulia Manca, Vladimir Rekovic, Vadim Rusu, Sunil Somalwar, John Strologas, Julia Thom Peter Wittich,
• Blessed: April 21st, 2006
  
  
• Data: Run II, 312-750 pb^-1
• Documentation:
• Public: Note PS,

SOME DETAILS ON THE METHOD

All analyses are performed as counting experiments, and the backgrounds are evaluated using a combination of data and Monte Carlo samples.
When combining the analyeses to obtain a combined limit, all the analyses are treated as exclusive channels. This means particular care is taken into avoiding a event is counted in two different analyses. If an event is selected by two or more different analyses, we assign the event to the analysis with the highest Signal/Sqrt(Background) and remove it from the other analysis(es). The S/Sqrt(B) quantity is plotted below for all the analyses considered.
For each analysis we then obtain an inclusive acceptance (which corresponds to the number of events expected for that analysis when run in its blessed configuration) and and exclusive acceptance, which is the number of events expected for that analysis ONLY, which is the acceptance in number of events brought by that analysis specifically which would have not been selected by the other analyses. The ratio of the exclusive to inclusive acceptances is also used to scale the inclusive backgrounds.
We combine the analyses using a frequentist approach described in hep-ex/9902006. To extract the limit we use a set of Monte Carlo samples generated using Pythia 6.128 and Isajet 7.71 in two different scenarios, with and without slepton mixing turned on. We refer to the scenario WITH slepton mixing as regular mSugra, and to the scenario WITHOUT slepton mixing as general MSSM, where we set the masses of the sleptons to be all of the same value. The MSSM scenario has been explored to compare with the results shown from D0 in the past iteration of these analyses.
Below are the plots we blessed for the combination. Please refer to the single analyses web-pages for the plots relative to a particular analysis.
Some analyses are currently being updated with more luminosity.

Blessed Plots and Tables:

	Table with the summary of the analyses which are enter in the combination. EPS or GIF
	Table with the systematic uncertainties and their correlations among channels. EPS or GIF
	The excluded cross section limit plotted as a function of the chargino mass for M_0=60 GeV/c^2 from the Monte Carlo points considered in the text (black solid line) in a mSugra-like scenario with slepton mixing turned off. The expected limit (black solid line) and the theory curve (red solid line) with its uncertainty (red dotted line) are also shown. The yellow and cyan bands represent the +-1 and +-2 sigmas uncertainties on the expected limit. The observed limit on the mass of the chargino is approximately 127 GeV/c^2 and the expected one is approximately 140 GeV/c^2. The limit curve has been smoothed using a polynomial function. EPS or GIF
	Limit without slepton mixing--only the +- 1sigma bands are shown. EPS or GIF
	Limit without slepton mixing--only the observed limit is shown. EPS or GIF
	The excluded cross section limit is plotted as a function of the chargino mass for M_0=60 GeV/c^2 from the Monte Carlo points considered in the text (black solid line) with slepton mixing turned on. The expected limit (black dashed line) and the theory curve (red solid line) with its uncertainty (red dotted line) are also shown. The yellow and cyan bands represent the +-1 and +-2 sigmas uncertainties on the expected limit. The expected exclusion limit corresponds to a chargino mass of approximately 117 GeV/c^2. The limit curve has been smoothed using a polynomial function. EPS or GIF
	Limit with slepton mixing--only the +- 1sigma bands are shown. EPS or GIF

	Branching ratio of chargino-neutralino into three leptons in the NO SLEPTON MIXING scenario EPS or GIF
	Some masses as a function of M_1/2 in the NO SLEPTON MIXING scenario EPS or GIF
	Branching ratio of chargino-neutralino into three leptons in the mSugra scenario with SLEPTON MIXING. EPS or GIF
	Some masses as a function of M_1/2 in the mSugra scenario with SLEPTON MIXING. EPS or GIF
	Acceptance for each analysis as a function of the chargino mass for the Susy Monte Carlo samples generated in the MSSM scenario without slepton mixing, separately for the LS-dilepton analyses and the trilepton analyses. The curve has been fitted to avoid discontinuities due to poor statistics. EPS or GIF