Searches for Exotic Physics using Top Quarks Kenneth

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Searches for Exotic Physics using Top Quarks Kenneth Johns, Venkat Kaushik, Xiaowen Lei, Matt

Searches for Exotic Physics using Top Quarks Kenneth Johns, Venkat Kaushik, Xiaowen Lei, Matt Leone*, Finn O’Grady, Jason Veatch * Elliott Cheu student

Achievements Ø Made significant contributions to four related but distinct physics searches § Search

Achievements Ø Made significant contributions to four related but distinct physics searches § Search for resonances using boosted top jets (ATLCOM-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) Ø Produced first U. Arizona Ph. D. using ATLAS data § Xiaowen Lei – now U. Arizona postdoc on D 0 Ø Venkat Kaushik named MET liason to the Top Physics Group 2

Physics Ø Our specific contributions § Boosted resonances ü Cut flow comparisons ü Mass

Physics Ø Our specific contributions § Boosted resonances ü Cut flow comparisons ü Mass spectra with jet, electron and muon systematic uncertainties ü Limit setting § Resolved resonances ü Cut flow comparisons ü Mass spectra using kinematic fitter ü Limit setting § Differential production cross section ü Unfolding optimization among different algorithms (SVD, MI, …) ü Binning algorithm for mass spectrum to minimize migration ü Mass spectra for cross section § Total production cross section ü Top likelihood variable optimization ü Cut flow comparisons 3

Physics Ø Searches for resonances with resolved and boosted top 4

Physics Ø Searches for resonances with resolved and boosted top 4

Physics Ø Total and differential production cross section 5

Physics Ø Total and differential production cross section 5

Service and Upgrade R&D Ø We continue to hold responsibility for several critical DQA

Service and Upgrade R&D Ø 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 Ø 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 Ø We are developing a ROD-like SPU card for use in a Phase 1 LAr Calorimeter upgrade – Digital triggering @ L 1 6

Service and Upgrade R&D Ø CSC and HLT Jet DQA Ø Atlas Muon and

Service and Upgrade R&D Ø CSC and HLT Jet DQA Ø Atlas Muon and LAr Readout Upgrade R&D § C-Card SPU Card 7