search for supersymmetry signals at the lhc
DESCRIPTION
Search for Supersymmetry Signals at the LHC. Claudia-Elisabeth Wulz. Institute of High Energy Physics of the Austrian Academy of Sciences. Motivation. We know that the Standard Model of particle physics must be extended - PowerPoint PPT PresentationTRANSCRIPT
Institute for Anything of the University of Everything
Claudia-Elisabeth Wulz
SUSY at the LHC
Search for Supersymmetry Signals at the LHC
C.-E. Wulz (Institute of High Energy Physics) 1
Institute of High Energy Physics of the Austrian Academy of Sciences
Motivation
2
We know that the Standard Model of particle physics must be extended
Supersymmetry is such a possible extension, which can be embedded in higher-ranking theories
Detailed predictions of experimental signatures at the TeV scale exist
Searches can be performed throughout the entire lifetime of the LHC
SUSY at the LHC C.-E. Wulz (Institute of High Energy Physics)
Experiment
3 SUSY at the LHC C.-E. Wulz (Institute of High Energy Physics)
Data from the CMS experiment will be used. By now more than 1 fb-1 of integrated luminosity are
available. By the end of 2011 3 to 4 fb-1 are expected. The Vienna CMS groups have particular experience in
triggering, tracking, recontstruction of tracks and vertices as well as of muons, b’s and t’s.
Research Goals
4 SUSY at the LHC C.-E. Wulz (Institute of High Energy Physics)
Detect deviations from the Standard Model through inclusive analyses
Contribute to determine if a signal can be SUSY or not
Identify SUSY particles and determine their parameters, measure production cross-sections and branching fractions
In parallel: optimize/develop trigger strategies for all analyses
Now
Beginning ofLHC Phase 2
(≈2020)
Use generic signatures to detect deviations from the Standard Model
Methodology - generic signatures
5 SUSY at the LHC C.-E. Wulz (Institute of High Energy Physics)
Current focus: search in the jets + missing ET + single muon channel
DKPI theses: • exploit jets + missing ET + single electron channel• exploit heavy flavor content of events
Leptonic topologies• Single lepton• Same-sign di-leptons• Opposite-sign di-leptons• Tri-leptons• Di-leptons + photon
Hadronic topologies• Exclusive n-jet• Inclusive ≥3 jet• Photon + missing ET
Methodology - simplified models
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Use simplified models
Example: on-shell effective theories (OSETs)• models based on bottom-up approach
• templates describing particle spectra and decay chains• OSETs can be used to tune and interpret searches in a more model-
independent way and to serve as interface between theory and experiment
Methodology – specific searches
7 SUSY at the LHC C.-E. Wulz (Institute of High Energy Physics)
Use specific event signatures and models
Two possible, complementary approaches:• perform cut-based analysis• use multivariate techniques
Example: scalar top production in association with two b-jets in the coannihilation region within the Minimal Supersymmetric Standard Model, with branching fraction close to 100%
Synergies within the DK
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Collaboration experiment – theory• A. Hoang (University of Vienna)• Theory groups (Institute of High Energy Physics)
Development of algorithms (trigger, reconstruction, analysis)• R. Frühwirth (Institute of High Energy Physics, TU Vienna)• M. Jeitler (Institute of High Energy Physics, TU Vienna)
Experimental techniques, detector issues• M.Krammer (Institute of High Energy Physics, TU Vienna)
Added value
SUSY at the LHC SUSY at the LHC
Students will work in a stimulating environment:• investigation of fundamental physics problems• world’s most powerful particle accelerator• large scientific community but human-sized research groups• international, multidisciplinary
Focus on research activities will shift to physics analyses, after long and important development work in triggering and tracking
Reinforcement of collaboration between theorists and experimentalists
SUSY at the LHC C.-E. Wulz (Institute of High Energy Physics) 9
Thank you for your attention!
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