Edms in SUSY GUTS

Hadronic and leptonic EDMs in SUSY GUTs are reviewed in this article.Comment: Talk given at NuFact04, Osaka, Japan, July 26 - August 1,2004 - 3 pages, 2 figure

CP violation in supersymmetric seesaw models

In supersymmetric (SUSY) extensions of the seesaw mechanism the neutrino Yukawa interaction induces the flavor and CP violating sfermion mass terms via the radiative correction. In this article we review the CP violating phenomena in the SUSY seesaw models.Comment: Talk given at SEESAW25: International Conference On The Seesaw Mechanism And The Neutrino Mass 10-11 Jun 2004, Paris, Franc

Hard gluon emission from colored scalar pairs\break in e^+ e^- annihilation

We study QCD correction to the pair production of colored scalar particles in electron-positron annihilation with an emphasis on gluon emission in the final state. We discuss the usefulness of working in a ``quasi-two-body'' frame and present the helicity amplitudes for the process. We compare the final state configuration with fermion pair production and find that the three-jet fraction for the scalars shows quantitative difference from that for fermions.Comment: 28 pages and 7 figure

Charge-breaking constraints on left-right mixing of stau's

In the minimal supersymmetric standard model, large left-right mixing of stau's is sometimes intriguing from phenomenological viewpoints. However, too large left-right mixing is not acceptable since the electroweak-breaking vacuum becomes metastable. In this paper the vacuum transition rate is evaluated by using semiclassical techniques, and constraints on parameters of the model are shown. In the calculation the bounce solution is derived in the multifield space. These constraints are also applied to the case of the low-energy minimal gauge mediation model.Comment: Since we found an error in our numerical code, all figures and a fitting formula in Eq. (11) in this manuscript are replaced from the original ones. The numerical differences between them are at most 15

The Higgs boson mixes with an SU(2) septet representation

We study a possibility of the Higgs boson, which consists of an SU(2) doublet and a septet. The vacuum expectation value of a septet with hypercharge Y=2 is known to preserve the electroweak rho parameter unity at the tree level. Therefore, the septet can give significant contribution to the electroweak symmetry breaking. Due to the mixing with the septet, the gauge coupling of the standard-model-like Higgs boson is larger than that in the standard model. We show the sizable VEV of the Higgs septet can be allowed under the constraint from the electroweak precision data. The signal strengths of the Higgs boson for the diphoton and a pair of weak gauge boson decay channels at the LHC are enhanced, while those for the fermonic decay modes are suppressed. The mass of additional neutral Higgs boson is also bounded by the current LHC data for the standard model Higgs boson. We discussed the phenomenology of the multiply charged Higgs bosons, which come from the septet.Comment: 14 pages, 13 eps file