Postdoc candidate, U. Oregon
Title: Search for a Scalar Partner to the Top Quark with 139 fb^{-1} of \sqrt{s} =13 TeV ATLAS Data
Host: Robin Erbacher
Special Location: Room 185
Abstract:
The LHC experiments’ physics programs are in mature stages of analyzing the now-complete Run 2 data sets. Despite collecting over an order of magnitude more data since the discovery of a 125 GeV scalar boson in 2012, no significant deviations from the Standard Model have been observed. In this seminar I will motivate a search for a new supersymmetric partner to the top quark, the stop boson. I will present my contributions to the ATLAS t\bar{t}+E^T_{miss} search, touching upon benefits and limitations of the analysis. Furthermore, I will share exploratory ideas on improvements to top triggering, reconstruction, and tagging.
User:
High-Energy Seminars
Time:
1:30pm - 2:30pm
Send Reminder:
Yes - 0 days 4 hour 0 minutes before start
Description:
Speaker: James Unwin
Title: Tweaking the Dark Matter Abundance with Cosmology
Host: Da Liu
Room: 432
Abstract: There is a great deal of freedom to propose changes from the standard cosmology history of the universe prior to Big Bang Nucleosynthesis. In this talk I will highlight that tweaks to standard cosmology can significantly boost or deplete the expected relic abundance of dark matter. I will highlight some classic applications of these ideas in the context of neutralino dark matter, discuss recent work applying these ideas to different dark matter scenarios, and outline some new ideas related to cosmologies with non-standard equations of state.
User:
High-Energy Seminars
Time:
1:30pm - 2:30pm
Send Reminder:
Yes - 0 days 4 hour 0 minutes before start
Description:
Speaker: Temple M He
Title: New Magnetic Symmetries in (d+2)-Dimensional QED
Host: Terning
Room: 432
Abstract: Previous analyses of asymptotic symmetries in QED have shown that the subleading soft photon theorem implies a Ward identity corresponding to a charge generating divergent large gauge transformations on the asymptotic states at null infinity. In this work, we demonstrate that the subleading soft photon theorem is equivalent to a more general Ward identity. The charge corresponding to this Ward identity can be decomposed into an electric piece and a magnetic piece. The electric piece generates the Ward identity that was previously studied, but the magnetic piece is novel, and implies the existence of an additional asymptotic "magnetic" symmetry in QED.