ILC Workshop on Potential Experiments (ILCX2021)

New No-Lose Theorem for Higgs Coupling Measurements

28 Oct 2021, 11:20

20m

Room #2 (Zoom Meeting ID: 823 6921 2312)

Oral presentation using Zoom Session F: Higgs properties F-1: Higgs properties

Speaker

Ryo Nagai (Nagoya University)

Description

We obtain the upper bound on the new physics scale as a function
of the Higgs coupling deviation factor by considering the perturbative
unitarity of $2\to 2$ scattering amplitudes among the longitudinally
polarized electroweak gauge bosons and the Higgs bosons.
We estimate the unitarity bound in a new effective field theory
which parameterizes the sizable non-decoupling effects from
the new physics in the Higgs self-couplings. Our effective field theory is
contracted based on the experimental fact that the Higgs couplings
to electroweak bosons/fermions are consistent with those predicted
in the SM within O(10%) error.

Presentation materials

ILCX-nagai.pdf