Speaker: Tao Han
Title:EW physics at very high energies: A multi-TeV muon collider as a case study
Room: 285
Host: John Terning
Abstract: The Standard Model electroweak (EW) sector exhibits some novel features at very high energies. At energies much larger than the EW scale, the EW gauge symmetry is essentially restored and the massless splitting phenomena dominate the EW physics. Beyond the familiar gauge theory splitting functions, we discuss the emergence of additional ``ultra-collinear'' splitting phenomena and the naive violation of the Goldstone-boson Equivalence Theorem. Because the SU(2) quantum numbers are explicit and observable in common physical processes, subtitles of the Bloch-Nordsieck theorem violation are discussed. The vector-boson fusion processes take over as the leading contributions at high energies, and the EW parton distribution functions are formulated. We implement the EW showering and illustrate its importance by calculating a number of physical processes at high energies within and beyond the SM. Finally, we take a multi-TeV muon collider as a case study for precision Higgs physics and for discovery at the new energy frontier.
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High-Energy Seminars
Time:
1:30pm - 3:00pm
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Room: 3024
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High-Energy Seminars
Time:
1:30pm - 3:00pm
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Room: 3024
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Description:
Earth Day
User:
High-Energy Seminars
Time:
1:30pm - 3:00pm
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Description:
Speaker: Christiane Scherb
Title: Co-decaying dark matter in a Hidden Valley
Room: 3024
Host: John Terning
Abstract: Dark sectors, for example Hidden Valley models, are an interesting alternative to WIMPs. Hidden Valley models extend the SM by adding a non-Abelian gauge group and light fermions charged under it. In most Hidden Valley scenarios the dark matter candidate is a dark baryon. In this talk I discuss a setup in which the lightest dark mesons, called dark pions, are the dark matter candidate. In such a setup the observed relic dark matter abundance is obtained through co-decaying freeze-out. The resulting dark matter parameter space can be probed through the rich collider phenomenology of such models. However, collider probes of Hidden Valley models depend on the dark hadronization model. I show how the Lund Jet Plane can be used to construct hadronization model independent variables for dark sector searches.
User:
High-Energy Seminars
Time:
1:30pm - 3:00pm
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Yes - 0 days 6 hour 0 minutes before start
Description:
Speaker: Inbar Savoray
Title:
Room: 3024
Host: John Terning
Abstract:
April Fool's Day