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Scalar and fermion on-shell amplitudes in generalized Higgs effective field theory
Ryo Nagai, Masaharu Tanabashi, Koji Tsumura +1
Beyond standard model (BSM) particles should be included in effective field theory in order to compute the scattering amplitudes involving these extra particles. We formulate an ex…
Symmetry and geometry in generalized Higgs effective field theory -- Finiteness of oblique corrections v.s. perturbative unitarity
Ryo Nagai, Masaharu Tanabashi, Koji Tsumura +1
We formulate a generalization of Higgs effective field theory (HEFT) including arbitrary number of extra neutral and charged Higgs bosons (generalized HEFT, GHEFT) to describe non-…
Relic Abundance in a Secluded Dark Matter Scenario with a Massive Mediator
Shohei Okawa, Masaharu Tanabashi, Masato Yamanaka
The relic abundance of the dark matter (DM) particle is studied in a secluded DM scenario, in which the number decreasing process dominantly occurs not through the pair ann…
Unitarity sum rules, three site moose model, and the ATLAS 2 TeV diboson anomalies
Tomohiro Abe, Ryo Nagai, Shohei Okawa +1
We investigate interpretations for the ATLAS 2 TeV diboson anomalies. The roles of the unitarity sum rules, which ensure the perturbativity of the longitudinal vector boson sc…
Does unitarity imply finiteness of electroweak oblique corrections at one-loop? - constraining extra neutral Higgs bosons -
Ryo Nagai, Masaharu Tanabashi, Koji Tsumura
Introducing arbitrary number of neutral Higgs bosons in the electroweak symmetry breaking sector, we derive a set of conditions among Higgs couplings which need to be satisfied to…
Exploring Quantum Physics at the ILC
A. Freitas, K. Hagiwara, S. Heinemeyer +4
We review the ILC capabilities to explore the electroweak (EW) sector of the SM at high precision and the prospects of unveiling signals of BSM physics, either through the presence…