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Events on Wednesday, April 26th, 2023

GREAT IDEAS Coffee Hour - Cancelled
Time: 12:15 pm - 1:15 pm
Abstract: GREAT IDEAS is cancelled for this week.

GREAT IDEAS stands for Group for Reading, Educating, And Talking about Inclusion, Diversity, Equity, & Advocacy in Science. It is a multimedia reading group dedicated to amplifying the experiences of underrepresented groups in science and academia in order to become better advocates for our peers. GREAT IDEAS is open to everyone (students/ faculty/ staff/ etc), and all are welcome and encouraged to engage with the material and contribute to the discussions. To keep a welcoming and safe environment for everyone, we ask that everyone understand and adhere to our community guidelines for the discussions. If you would like to submit an article for a future GREAT IDEAS discussion, you can do so on this form.
Host: GMaWiP and Climate and Diversity Committee (contact Jessie Thwaites or R. Sassella with questions)
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Theory Seminar (High Energy/Cosmology)
Status of negative coupling modifiers for extended Higgs sectors
Time: 1:00 pm - 2:30 pm
Place: Chamberlin 5280
Speaker: Carlos Henrique de Lima, Carleton University
Abstract: In this work, we study the status of negative coupling modifiers in extended Higgs sectors, focusing on the ratio of coupling modifiers that probes custodial symmetry violation λWZ=κW/κZ. Higgs sectors with multiplets larger than doublets are the only weakly coupled models that give tree-level modifications to λWZ, and we explore all such models allowed by the constraint from the ρ parameter and perturbative unitarity. This class of models has a custodial symmetry violating potential, while the vacuum configuration preserves the symmetry. We apply precision measurements from ATLAS and CMS and show that each data set can exclude a vast set of models with λWZ<0 at greater than 95\% confidence level. We give evidence that λWZ<0 is excluded in all weakly coupled models.
Host: George Wojcik
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