Kevin Nelson - Why stop at two? The search for HHH production at the LHC

Tuesday 21 Jan 2025, 12:30 → 13:30 America/Los_Angeles

48/2-224 - Madrone (SLAC)

The discovery of a particle resembling the SM Higgs boson opened new lines of inquiry at the LHC.  Among them are whether the Higgs boson acts as a portal to new physics as a dark matter mediator, the nature of the electroweak phase transition and baryogensis, and whether the scalar sector includes additional particles.  A diverse research program to measure the particle’s properties and possible BSM production or decay modes has since ensued.  A key parameter is the Higgs self-coupling, which in the SM modulates simultaneously the 3- and 4- Higgs vertices.  Searches for production of multiple Higgs bosons at the LHC constrains the Higgs self-coupling (and therefore the shape of the Higgs potential), and are used to search for BSM scalar particles.  Previous work includes many searches for HH production.  I will report on ATLAS’s recent search for HHH production in the 6b final state at the LHC, the first ever search for HHH.  Searches with many final state particles, including searches for multiple Higgs bosons, also provide fertile ground for the application of artificial intelligence and machine learning techniques to physics searches.  I will discuss future prospects in the context of the HHH search.

Join from PC, Mac, Linux, iOS or Android: https://stanford.zoom.us/j/98973156241?pwd=cEU5RFdlVXoyc0JTeTlDMkozKzQ5UT09

HHH_seminar.pdf

video2906717622.mp4