2017/05/05(Fri) 11:00 -12:30 七樓研討室 7F, P7F Seminar Room
Title
Probing extra Yukawa interactions by precision measurements of the Higgs boson coupling
Speaker
菊地真吏子 博士 (國立台灣大學) Dr. Mariko Kikuchi (National Taiwan University)Abstract
The two Higgs doublet model without any ad hoc symmetries,
in general should have extra Yukawa interactions which cause
exotic interactions such as flavor changing neutral processes.
Effects of the extra Yukawa interactions can also appear in
couplings of the 125GeV Higgs boson ($h$) via fermion loop contributions.
In this talk, we calculate the $hZZ$ coupling expected to be
measured with O(0.1)% accuracy at future lepton colliders,
at the one-loop level by the on-shell renormalization scheme,
and evaluate how the $hZZ$ coupling depends on the mass of
extra Higgs bosons and the extra Yukawa coupling $\rho_{tt}$.
We find that if $\rho_{tt} \cos\gamma < 0$, where $\gamma$ is
a mixing angle of CP-even Higgs bosons, the $\rho_{tt}$ effect
induced top loop contribution cancels extra Higgs boson loop
contributions and one may have alignment without decoupling,
but exotic scalar bosons could have masses at several hundred GeV.
We also discuss whether future coupling precision measurements
can give stronger bound on $\rho_{tt}$ than the current bound from
flavor experiments.
Language
演講語言 (Language): in English