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함승우,S. K. Oh 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.4
The possibility of CP violation is studied in the Higgs sector of a supersymmetric standard model with multiple Higgs singlets. The tree-level Lagrangian in this model is assumed to conserve the CP symmetry. We ¯nd that CP violation is viable in this model at the one-loop level, in an explicit way, if the radiative corrections from the third generation of quarks and squarks are taken into account. In the presence of explicit CP violation, at the one-loop level, the upper bound on the mass of the lightest neutral Higgs boson and the productions of the neutral Higgs bosons via the Higgsstrahlung process in high-energy e+e¡ collisions are calculated. We ¯nd that the upper bound on the mass of the lightest neutral Higgs boson increases as the number of Higgs singlets increases in a regulated manner. The production cross sections of the neutral Higgs bosons also show a reasonable increasing behavior with respect to the number of Higgs singlets.
Higgs Bosons of a Minimal Supersymmetric Standard Model with an Extra U(1) at the ILC
함승우,조상규,오선근 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.5
The Higgs sector of the U(1)-extended supersymmetric model (USSM) is studied by considering the one-loop radiative corrections due to the quark and squark loops of the third generation. The mass of the lightest scalar Higgs boson depends significantly on the effective U(1)0 hypercharges of the Higgs fields. In the USSM, the upper bound on the lightest scalar Higgs boson mass is about 165 GeV at the one-loop level for a reasonable parameter space. In the USSM, the total sum for the couplings of the scalar Higgs boson to a pair of Z bosons, which is normalized to the corresponding SM Higgs coupling, deviates from unity because there is an extra U(1). Thus, the measurement of the total sum of the couplings of the scalar Higgs boson to a pair of Z bosons can be a criterion to distinguish between the USSM and other non-minimal supersymmetric standard models without an extra U(1). We calculate the minimum cross section for at least one of the three scalar Higgs bosons to be detected via the Higgs-strahlung process at the future e+e− p International Linear Collider with s = 500 and 800 GeV. The Higgs sector of the U(1)-extended supersymmetric model (USSM) is studied by considering the one-loop radiative corrections due to the quark and squark loops of the third generation. The mass of the lightest scalar Higgs boson depends significantly on the effective U(1)0 hypercharges of the Higgs fields. In the USSM, the upper bound on the lightest scalar Higgs boson mass is about 165 GeV at the one-loop level for a reasonable parameter space. In the USSM, the total sum for the couplings of the scalar Higgs boson to a pair of Z bosons, which is normalized to the corresponding SM Higgs coupling, deviates from unity because there is an extra U(1). Thus, the measurement of the total sum of the couplings of the scalar Higgs boson to a pair of Z bosons can be a criterion to distinguish between the USSM and other non-minimal supersymmetric standard models without an extra U(1). We calculate the minimum cross section for at least one of the three scalar Higgs bosons to be detected via the Higgs-strahlung process at the future e+e− p International Linear Collider with s = 500 and 800 GeV.
Electroweak Phase Transition and Higgs Self-couplings in the Two-Higgs-doublet Model
함승우,S. K. Oh 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.5
We calculate both the cubic and the quartic self-couplings of the lighter scalar Higgs boson without assuming the decoupling limit in the two-Higgs-doublet model (THDM). In some regions of parameter space of the THDM where the electroweak phase transition is strongly first order,the quartic self-coupling of the lighter scalar Higgs boson might deviate by at least 40% from the standard model prediction.