The Gildener-Weinberg Two-Higgs Doublet Model at Two Loops

  • Starts: 3:30 pm on Thursday, February 23, 2023
  • Ends: 4:30 pm on Thursday, February 23, 2023
Nobody (no theorist, anyway) believes that H(125) is all there is to the Higgs sector of electroweak symmetry breaking. Then why is H so light and why does it have Standard Model couplings to gauge bosons and fermions? The GW-2HDM answers these questions: (1) H is the (pseudo-) Goldstone boson of spontaneously-broken scale symmetry, and (2) as a consequence, H is “aligned”, i.e., has these SM couplings to a very high degree. As a corollary, many popular searches for BSM Higgs bosons are — and will remain — fruitless. Two years ago, I talked about this here in the one-loop approximation of the model’s effective potential, Veff. To assess the accuracy of these predictions, Estia Eichten and I extended the calculation of Veff to two loops. (A calculation no one will repeat!) The new results for BSM Higgs masses and best production modes are presented in this talk.
PRB 595
Ken Lane
Boston University
David Sperka