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Events on Wednesday, December 13th, 2023

Academic Calendar
Last Fall Semester class day
Abstract: *Note: actual end time may vary.* URL:
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Thesis Defense
Naturalness Demands an Answer: The Imperative of Natural SUSY at the HL-LHC
Time: 11:00 am - 1:00 pm
Place: 5310 CH
Speaker: Kairui Zhang, Physics PhD Graduate Student
Abstract: We explore the ramifications of natural supersymmetry (natSUSY) frameworks for upcoming experiments at the high-luminosity Large Hadron Collider (HL-LHC). Specifically, we scrutinize the production and subsequent decay modes of heavy SUSY Higgs bosons, both neutral and charged, as well as stop pairs and electroweakino pairs, within the context of natural SUSY. The study highlights the importance of decay hierarchy and the potential existence of a light higgsino for accurate interpretation of LHC data. A detailed examination reveals that the dominant decay modes of heavy winos to Standard Model bosons—W, Z, or h—alongside light higgsinos with weak-scale masses, emerge as a unique signature of the natural SUSY paradigm. The investigation delineates both the discovery and exclusion limits for these heavy SUSY particles, thereby offering critical insights into the viability and constraints of natural SUSY models in the forthcoming LHC runs.
Host: Vernon Barger
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Department Meeting
Closed Department Meeting
Time: 12:15 pm - 1:15 pm
Place: B343 Sterling
Speaker: ERIKSSON, UW - Madison
Closed meeting to discuss personnel matters—pursuant to Section 19.85(1)(c) of the Wisconsin Open Meetings Law
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Preliminary Exam
A Search for Vector-Like Leptons (VLLs)
Time: 2:30 pm - 4:30 pm
Place: 4272 Chamberlin
Speaker: Elise Chavez, Physics PhD Graduate Student
Abstract: The Standard Model is the current theoretical description of fundamental particles and their interactions. While it is able to describe the majority of phenomena that we observe, there are many that it cannot accommodate for. Such phenomena are dark matter, dark energy, and lepton non-universality. New theories have been proposed that extend the Standard Model in order to answer these long standing questions. One such extension is the 4321 model that predicts several new particles, one of which is the vector-like lepton (VLL). A search for pair produced vector-like leptons (VLLs) is proposed using the Run II data that was produced by proton-proton collisions at sqrt(s) = 13 TeV and collected by the Compact Muon Solenoid (CMS) at the Large Hadron Collider (LHC). In this search, the modes where the decays of the VLLs result in two Standard Model leptons are examined. This search employs a set of optimized kinematic selection criteria to enhance the signal, with respect to the Standard Model background, and a data based approach to determine the dominant ttbar background process. The goal of this search is to determine whether we see an excess of events in our data and set limits on the cross section of the VLL pair production.
Host: Tulika Bose
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Preliminary Exam
Investigation of oxide defects and heterostructure modifications for use in quantum computing
Time: 3:30 pm - 5:30 pm
Place: B343 Sterling
Speaker: Emily Joseph, Physics PhD Graduate Student
Abstract: Si/SiGe quantum dots are attractive candidates for quantum computation yet there are significant challenges to overcome in an effort to improve the scalability of the system. These devices are susceptible to charge noise, some of which may arise from two-level systems (TLS) in the oxide. In this work we use resonator measurement and STEM images to investigate ALD oxide quality to improve semiconducting qubits. Another challenge inherent to Si/SiGe quantum dots is the energy splitting of the conduction band valley states. The valley splitting in Si devices is largely variable and unpredictable and it would be advantageous to be able to predictably rely on a designed-in valley splitting. A modification to the heterostructure has been produced with oscillating concentration of Ge through the quantum well, called the Wiggle Well. Theory predicts that this structure will show strong spin-orbit coupling and with shear strain can have a deterministically large valley splitting. Here we describe methods for mechanically introducing shear strain into the quantum well and a proposed experiment measuring the spin-orbit coupling of the Wiggle Well and making a Loss-DiVincenzo qubit without a micromagnet.
Host: Mark Eriksson
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