J. S. L. Lee

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We examine the prospect to measure the Higgs boson mass using the recently introduced kinematic variable, the MT2-Assisted On-Shell (MAOS) momentum, that provides a systematic approximation to the invisible neutrino momenta in dileptonic decays of W -boson pair. For this purpose, we introduce a modified version of the MAOS momentum, that is applicable even(More)
We investigate the observability of the lightest Higgs boson in the gluon–fusion channel at the CERN Large Hadron Collider (LHC) in the minimal supersymmetric Standard Model with explicit CP–violating mixing among three neutral Higgs bosons. The lightest Higgs boson with its mass less than 130 GeV can be detected at the LHC via its gluon–fusion production(More)
R-parity violating bilinear (soft) terms in the supersymmetric standard model would be the leading source for nonzero neutrino masses and mixing. We point out that the mixing between neutralinos (charginos) and neutrinos (charged leptons) driven by the bilinear terms take factorized forms, which may enable us to probe the neutrino mixing parameters in a(More)
We consider the proton decay in supersymmetric models with a gravitino or axino lighter than the proton. This consideration leads to a stringent limit on the R parity and B violating Yukawa coupling of the superpotential operator U c i D c jD c k as λ ′′ 112 ≤ 10(m3/2/eV) for a light gravitino, and λ 112 ≤ 10(Fa/10 10 GeV) for a light(More)
We compute one–loop corrections to the mass matrix of the neutral Higgs bosons of the Minimal Supersymmetric Standard Model with explicit CP violation. We use the effective potential method, allowing for arbitrary splitting between squark masses. We include terms O(g2h2), where g and h stand for electroweak gauge and Yukawa couplings, respectively. Leading(More)
R-parity and L violation in the MSSM would be the origin of the neutrino oscillation observed in Super-Kamiokande. A distinctive feature of this framework is that it can be tested in colliders by observing decay products of the destabilized LSP. We examine all the possible decay processes of the neutralino LSP assuming the bilinear contribution to neutrino(More)
In most supersymmetric theories, charginos χ̃±1,2 belong to the class of the lightest supersymmetric particles and the couplings of Higgs bosons to charginos are in general complex so that the CP–violating chargino contributions to the loop–induced coupling of the lightest Higgs boson to photon pairs can be sizable even in the decoupling limit of large(More)
We present a model–independent study of the effects of a neutral Higgs boson without definite CP–parity in the process γγ → tt̄ around the mass pole of the Higgs boson. Near the resonance pole, the interference between the Higgs–exchange and the continuum amplitudes can be sizable if the photon beams are polarized and helicities of the top and anti–top(More)
The neutral current effects of the future high statistics atmospheric neutrino data can be used to distinguish the mechanisms between a νμ oscillation to a tau neutrino or to a sterile neutrino. However, if neutrinos possess large diagonal and/or transition magnetic moments, the neutrino magnetic moments can contribute to the neutral current effects which(More)