Search for stop pairs in the eμET channel (in French)
- Blaise Pascal Univ, Aubiere (France)
The Standard Model gives a satisfying description of subatomic processes at low energy (< 1 TeV). Beyond this energy scale, other models must be considered. Supersymmetry is one of them. It gives in an elegant way, solutions to several Standard Model short comings. This document reports the search for a supersymmetric signal characterized by the production of two stops decaying into two b-jets, one electron, one muon and missing energy. This study has been performed at the D0 experiment, located on the ring of Tevatron collider at FermiLab, (Chicago, USA), whose energy in the center of mass reaches √s = 1.96 TeV. The data used for this analysis have been collected during Run IIa of D0 detector; from april 2003 to march 2006 (~ 1fb-1). The objects handled for this analysis require a good understanding of both calorimeters, muon detectors and trackers. As Tevatron is an hadronic collider and the number of Standard Model processes with the same signature as the signal is low, the background is thus dominated by QCD processes. After the selection cuts, no excess of data has been observed with respect to the Standard Model expectation. D0 experiment sensibility has been improved and the 95% CL exclusion area in [m$$\bar{v}$$, m$$\bar{t}$$1], extended up to stop masses of 170 GeV/c2 and sneutrino masses of 105 GeV/c2. Besides, a part of my work for the collaboration consisted in elaborating a tool to discriminate calorimetric objects at level 3 trigger system; and also in calibrating the two simulated level 1 readouts.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 935241
- Report Number(s):
- FERMILAB-THESIS-2007-66; TRN: US0804160
- Country of Publication:
- United States
- Language:
- French
Similar Records
Measurement of the top quark pair production cross-section in dimuon final states in proton-antiproton collisions at 1.96 TeV
Measurement of the top quark mass in the dilepton final state using the matrix element method