Seong Chan Park

Testing Higgs triplet model and neutrino mass patterns

The observed neutrino oscillation data might be explained by new physics at a TeV scale, which is testable in the future experiments. Among various possibilities, the low-energy Higgs triplet model is a prime candidate of such new physics since it predicts clean signatures of lepton flavor violating processes directly related to the neutrino masses and mixing. It is discussed how various neutrino mass patterns can be discriminated by examining the lepton flavor violating decays of charged leptons as well as the collider signatures of a doubly charged Higgs boson in the model.

Superheavy dark matter and IceCube neutrino signals: Bounds on decaying dark matter

Superheavy dark matter may show its presence in high energy neutrino signals detected on earth. From the latest results of IceCube, we could set the strongest lower bound on the lifetime of dark matter beyond 100 TeV around

Higgs inflation from standard model criticality

10^{28} {\rm sec}

Production of spinning black holes at colliders

. The excess around a PeV is noticed and may be interpreted as the first signal of DM even though further confirmation and dedicated searches are invited.

Inflation by non-minimal coupling

In this chapter, we investigate the possibility that the SM Higgs boson plays the role of an inflation in light of the discovery of the Higgs boson. In 2007, Bezurkov and Shaposhnikov first pointed out this possibility. The successful Higgs inflation is realized if the non-minimal coupling between the Higgs H and scalar curvature \(\mathcal {R}\), \(\xi |H|^2 \mathcal {R}\), is introduced. \(\xi \) is the coupling constant, and very large value, \(\xi \sim 10^5\), is required for successful inflation. However, the observation of the Higgs and determination of its mass changes the situation. As we have seen in Chap. 2, the Higgs self coupling and its beta function becomes zero at very high scale, which means that the Higgs potential is very flat around string/Planck scale. This opens up the new possibilities of the Higgs inflation, which we will present here. In Sect. 3.1, we present the general argument of the Higgs inflation above the SM cutoff \(\Lambda \). In Sect. 3.2, we show that non-minimal coupling \(\xi \) can be as small as \(\mathcal {O}(10)\).

Spin configuration of top quark pair production with large extra dimensions at photon-photon colliders

When the Planck scale is as low as TeV scale, there will be chances to produce Black holes (BHs) at future colliders. Generally, BHs produced via pariticle collisions could have non-zero angular momentum. We estimate the production cross section of spinning and non-spinning BHs for future colliders. Although the production cross section for the rotating BH is much suppressed by angular momentum dependent factor, the total cross section could be

Z boson pair production at CERN LHC in a stabilized Randall-Sundrum scenario

\sim 2 -3

Muon anomalous magnetic moment and the heavy photon in a little Higgs model

times enhanced for the case of

Probing the Z ′ gauge boson with the spin configuration of top quark pair production at future e − e + linear colliders

\delta =4-6

Phenomenology of the heavy B H in a littlest Higgs model

.