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The Department of Physics presents HEP Seminar:


Third generation Supersymmetry at the LHC and Kinematic Variables for new physics searches


Paul Jackson

University of Adelaide



Monday, October 19, 2015

114 Dana Research Center

12:00 p.m.


             Signal events where multiple missing neutral particles are present in a final state represent challenging topologies to search for beyond standard model physics at the LHC. The key to any search is the ability to separate background-like events from signal-like events. Identifying such signal-like events, and extracting their properties, is exacerbated by a lack of knowledge of the particle masses and some missing kinematic handles. In this talk I summarise the state-of-the-art of searches for third generation Supersymmetry with the ATLAS experiment. I present a new method to search for open final states where the decays of the two parent particles may proceed via the same, or different, channels. For final states with weakly interacting particles, a new basis of variables can be derived using the "Recursive Jigsaw" technique. I’ll discuss the application of this procedure by considering final states containing 2 b-jets, 2 charged leptons and missing transverse momentum. I’ll compare dileptonic ttbar decays to various parameter choices for direct third generation scalar top quark (stop) production, where each stop decays to bottom chargino, which

subsequently decay to a neutralino LSP via either on- or off-shell W decay. The applicability of the resulting variable basis is discussed in the context of other final states potentially within reach at Run 2 of the LHC.

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