Search for Chargino Neutralino Production in ee+e,mu, Public Page

Search for Chargino-Neutralino Associated Production in ee+e,mu channel, Public Page

This Run II analysis is an inclusive search for Chargino Neutralino associated production in their decay channel with trileptons. We concentrate only on the decays with two electrons and a third electron or muon. The analysis is essentially a counting experiment; the events are selected from the inclusive high-pt electron trigger. The SM backgrounds are evaluated from the Monte Carlo samples available in Gen 5, while the rate of fake leptons is obtained from the Jet sample data. The selection of the events requires two electrons with 20 and 8 GeV Et respectively (satisfying the electron ID cuts as in the note and as blessed in the Joint Physics meeting), satisfying the topological cuts:
- 15 < Mee < 76 and Mee > 106 GeV/c2;
- Transverse missing energy > 15 GeV;
- Delta Phi(ee) < 160;
- DeltaR(ee) > 0.4
- Number Jets (with Et > 20) < 2;
and a third lepton which can be electron or muon with Et > 4 GeV and satisfying the same cuts as the second electron and the muon ID criteria as in the note. We observe zero events, with a expected background of 0.172± 0.05 events. The systematic uncertainty has been revaluated in June 2005 and at the moment this analysis is fully blessed. An update of this analysis also in conjunction with the search in the muon channel is currently udergoing.

Authors: Giulia Manca and Martin Griffiths, Beate Heinemann
Blessed: June 30th, 2005
Data: Run II, 346 pb^-1
Public documentation: Note PS, PDF

Blessed Plots and Tables:


	Invariant mass distribution for events with two electrons before any other cut, for signal and background EPS or GIF

	Delta Phi distribution between the first two electrons for events with two electrons after the invariant mass cut has been applied, for signal and background EPS or GIF

	Missing transverse energy distribution for events with two electrons after the invariant mass and the delta Phi cuts have been applied EPS or GIF or ROOT

	Number of jets with L5 corrected energy above 20 GeV for events with two electrons after the invariant mass, the delta Phi and the missing energy cuts have been applied EPS or GIF or

	Missing transverse energy distribution for events with two electrons after all the cuts a part from the Met requirement itself have been applied. These include also the requirement for the third lepton. EPS or GIF or ROOT

	Table showing the number of expected events from the SM processes and the fakes and the expected number of signal events together with the observed events. EPS or GIF

	Table showing the sources of systematic uncertainty and their contributions. EPS or GIF

	Final table showing the total of the background and the expected and observed events. EPS or GIF

This page was last updated July 27th, 2005 by Giulia Manca.
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