Search for low-MET supersymmetry at CMS

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Date/Time:Wednesday, 06 Feb 2013 from 4:10 pm to 5:10 pm
Location:A401, Zaffarano Hall
Contact:Chunhui Chen
Channel:High Energy Physics
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Dr. James F Hirschauer, Fermi National Accelerator Laboratory

Supersymmetry (SUSY) garners much interest because it can simultaneously solve the hierarchy problem, allow unification of the fundamental interactions, and provide a candidate for dark matter. Most searches for SUSY focus on the presence of large missing transverse energy (MET) carried away by the lightest SUSY particle (LSP). As the parameter space available for high-MET SUSY is reduced by recent results from the CERN LHC, it becomes more important to study well motivated low-MET alternatives including models characterized by hidden sectors and R-parity violation (RPV).

Though couplings are constrained by precision measurements of low energy processes, there is room for SUSY models with RPV, which allow decay of the LSP resulting in low-MET signatures. Additionally, the more recent "stealth" SUSY model yields low-MET signatures while conserving R-parity by means of a new hidden sector in which SUSY is approximately conserved.

We present searches for low-MET SUSY in pp collisions at sqrt(s) = 7 TeV corresponding to 5/fb of integrated luminosity collected with the CMS detector in 2011. We search for stealth SUSY in events with two photons and several hadronic jets, and we search for RPV decays of a light top squark in events with two tau mesons and two b-tagged jets. Based on good agreement between the data and the standard model expectation, we determine limits on squark production in the framework of stealth SUSY and top squark production in the framework of RPV SUSY.