The Standard Model provides a highly successful description of our world. The last piece has been filled in with the Higgs-boson discovery in 2012. A future Higgs factory is proposed to undertake the precision measurements of the properties of the Higgs boson and probe new physics beyond the Standard Model. We choose the Standard Model effective field theory as a mostly model-independent way to parametrize new physics and constrain the Wilson coefficients of its higher dimensional operators. We perform both optimistic and conservative fits assuming different possible future colliders. In addition, we focus on the Higgs self-coupling measurements, mainly on the cubic and quartic Higgs couplings. We exploit the one-loop contribution of the quartic Higgs coupling to the dihiggs channel at...[ Read more ]

The Standard Model provides a highly successful description of our world. The last piece has been filled in with the Higgs-boson discovery in 2012. A future Higgs factory is proposed to undertake the precision measurements of the properties of the Higgs boson and probe new physics beyond the Standard Model. We choose the Standard Model effective field theory as a mostly model-independent way to parametrize new physics and constrain the Wilson coefficients of its higher dimensional operators. We perform both optimistic and conservative fits assuming different possible future colliders. In addition, we focus on the Higgs self-coupling measurements, mainly on the cubic and quartic Higgs couplings. We exploit the one-loop contribution of the quartic Higgs coupling to the dihiggs channel at the lepton colliders and hadron colliders and present the allowed region of the cubic Higgs coupling versus quartic Higgs coupling. Beyond Higgs physics, we also discuss axion physics in astrophysics. Axions in the vicinity of a Black Hole-Pulsar binary system may form a gravitational “molecule” structure. In such a system, the axion cloud is described by the binary hybridized orbitals, similar to the microscopic description of the electronic cloud in a chemical molecule. To demonstrate this, we develop a semi-analytical formalism using the method of the linear combination of atomic orbitals in the adiabatic limit. This enables us to use “an oscillating axion-cloud” profile and a perturbed binary rotation, in order to expose and predict novel detection signals.