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Searches for Exotic Physics using Top Quarks Kenneth Johns, Venkat Kaushik, Xiaowen Lei, Matt Leone*, Finn O’Grady, Jason Veatch * Elliott Cheu student
Achievements • Made significant contributions to four related but distinct physics searches • Search for resonances using boosted top jets (ATL-COM-PHYS-2011-1692) • Search for resonances using resolved top jets (ATL-COM-PHYS-2011-1392) • Measurement of the production differential cross section (ATL-COM-PHYS-2011-1356) • Measurement of the production total cross section (ATL-COM-PHYS-2011-104) • Produced first U. Arizona Ph.D. using ATLAS data • Xiaowen Lei – now U. Arizona postdoc on D0 • Venkat Kaushik named MET liason to the Top Physics Group
Physics • Our specific contributions • Boosted resonances • Cut flow comparisons • Mass spectra with jet, electron and muon systematic uncertainties • Limit setting • Resolved resonances • Cut flow comparisons • Mass spectra using kinematic fitter • Limit setting • Differential production cross section • Unfolding optimization among different algorithms (SVD, MI, …) • Binning algorithm for mass spectrum to minimize migration • Mass spectra for cross section • Total production cross section • Top likelihood variable optimization • Cut flow comparisons
Physics • Searches for resonances with resolved and boosted top
Physics • Total and differential production cross section
Service and Upgrade R&D • We continue to hold responsibility for several critical DQA (Data Quality Assessment) items • Online and offline CSC monitoring • Online and offline HLT Jet monitoring • Online and offline HLT MET monitoring • CSC data-driven calibration • We continue to play a major role in pushing Micromegas (MM) detectors for a Phase 1 muon upgrade • Test beam participation and data analysis • Successful testing of “C-Card” for MM DAQ at CERN • Development of MM front-end card using BNL peak finding ASIC • We are developing a ROD-like SPU card for use in a Phase 1 LAr Calorimeter upgrade – Digital triggering @ L1
Service and Upgrade R&D • CSC and HLT Jet DQA • Atlas Muon and LAr Readout Upgrade R&D • C-Card SPU Card