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While most SUSY searches focus on particular points in the parameter space of SUSY models, our group is developing a broad research program based on physics signatures containing multi-b jets and missing ET in the final state. This includes understanding (and measuring) Standard Model processes and probing SUSY in this final state signature.
The requirement of b-jets in events with large missing ET and multi-jets is well motivated both theoretically and experimentally:
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The b+MET signature is almost unexplored in ATLAS: b-tag and missing ET are among the most challenging and complex techniques. Expertise in multiple areas is required, which matches well SLAC strengths.
Experimental challengesThere are several experimental challenges to b+MET analyses:
- Efficient b-tag trigger to afford lower missing ET and jet pT requirements .(to increase the event selection efficiency)
- Jet energy scale and resolution, and the effect of multiple interactions. (much broader scope beyond SUSY searches: SM precision measurements)
- MET Missing ET clean up, calibration, and significance. In particular, in the presence of b-jets in the final state.
- b-tagging:
- b-tag background estimation at high tag multiplicities.
- Estimation of b production from gluon splitting.
- b/c flavor separation.
- high pT b-tagging
Our group is heavily involved in all these areas is making significant contributions to ATLAS reconstruction software and analysis.
Below there is a list of some of the b+MET physics analyses being pursued:
Top quark cross section measurement in the missing ET + b-jet channel
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