| Seminar Date: | Wednesday, September 26, 2012 |
| Time: | 11:00 AM - 12:30 PM |
| Location: | Madrone |
| Abstract: | A search for supersymmetry or other new physics resulting in similar final states is presented using a data sample of 4.73 inverse femtobarns collected at sqrt(s)=7 TeV with the CMS detector. Fully hadronic final states are selected based on the variable MT2, an extension of the transverse mass in events with two invisible particles. Two complementary studies are performed. The first targets the region of parameter space with medium to high squark and gluino masses, in which the signal can be separated from the standard model backgrounds by a tight requirement on MT2. The second is optimized to be sensitive to events with a light gluino and heavy squarks. In this case, the MT2 requirement is relaxed, but a higher jet multiplicity and at least one b-tagged jet are required. No significant excess of events over the standard model expectations is observed. Exclusion limits are derived for the parameter space of the constrained minimal supersymmetric extension of the standard model, as well as on a variety of simplified model spectra. |
| Speaker: | Pascal Nef - ETH Zurich
 Mr. Nef is a Ph.D. student in the CMS group of the Swiss Federal Institute of Technology (ETH) Zurich. His research focus is ultimately on the search for physics beyond the standard model of particle physics. He has studied the discovery potential of top-partners in composite Higgs models and conducted a novel search for supersymmetry in hadronic final states. In this search, the kinematic variable MT2 is used to discriminate a potential signal from the standard model backgrounds.
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