Theory Seminar (High Energy/Cosmology)

<< Fall 2022 Spring 2023 Summer 2023 >>
Subscribe your calendar or receive email announcements of events
Status of negative coupling modifiers for extended Higgs sectors
Date: Wednesday, April 26th
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
Add this event to your calendar