Probing Heavy Neutral Higgs Bosons At High Energy Hadron Colliders

After the discovery of Higgs boson at the CERN LHC, ATLAS and CMS collaborations observed its properties. By now, its spin, parity and couplings with other particles are compatible with the Standard Model(SM). How to search for new physics beyond the SM is the most important issue faced by the whole field the high energy physics.Physicists have already done a lot of research on phenomenology of beyond SM physics and there is no new evidence for certain new physics models. On the other hand,the dimension 6 anomalous couplings in the low energy e?ective theory of a higher energy scale physics have not been measured but only have experimental constraints. These two method have there own advantages and disadvantages in di?erent parameter range.Higgs Boson is one of the most important windows to new physics. Many new physics models concerns more than one Higgs particles. We adopt a model independent parametrization method on the assumption of the existence of a neutral heavy Higgs boson. And then we can search new physics through the detection of such heavy Higgs.In the case that the heavy Higgs has couplings with gauge bosons, we propose to detect it through two channels, i.e. weak boson scattering and VH?associated production.We take several parameter sets to simulate their collider phenomenology in reasonable integrated luminosity range. We show that signals of new physics in these two channels can be observed and the resonance peak of heavy Higgs can be measured experimentally.In the limit that the heavy Higgs does not has couplings with gauge bosons, we proposed to detect it through its production with top quark. We simulate the results for heavy Higgs with di?erent mass on hadron colliders and get the integrated luminosity needed by reaching di?erent signal strength. We propose a method to measure the mass of such a gauge-phobic heavy Higgs and point out that we can observe the resonance peak of heavy Higgs at the SppC when heavy Higgs mass is relatively large.Thus, we set up a criterion for new physics models: The necessary condition for surviving new physics models is that their predictions should satisfy the above experimental results. And those models which cannot meet this criterion are all excluded.