28 citations · 161 across the 19 of their papers we have counts for
19 papers
Planck isocurvature constraint on primordial black holes lighter than a kiloton
TaeHun Kim, Jinn-Ouk Gong, Donghui Jeong +3
We demonstrate that primordial black holes (PBHs) lighter than , which evaporated before the big bang nucleosynthesis, can induce significant isocurvature perturb…
Lifetime of the dark boson
Dong-Won Jung, Kang Young Lee, Chaehyun Yu
The mediator particle between the Standard Model sector and a hidden sector might have a long lifetime to show the observable displaced vertices in experiments. Considering a fermi…
Constraints on the dark Z model from the Higgs boson phenomenology
Dong-Won Jung, Kang Young Lee, Chaehyun Yu
We study constraints on the hidden sector model mediated by an additional SU(2) Higgs doublet from the phenomenology of Higgs bosons. The hidden sector is assumed to contain a hidd…
Phenomenology of a two-component dark matter model
Yeong Gyun Kim, Kang Young Lee, Soo-hyeon Nam
We study a two-component dark matter model consisting of a Dirac fermion and a complex scalar charged under new U(1) gauge group in the hidden sector. The dark fermion plays the do…
Positronium Decays with Dark and Fermionic Dark Matter
Dong-Won Jung, Chaehyun Yu, Kang Young Lee
We investigate the invisible decay of positronium to probe the fermionic light dark matter mediated by the dark boson. Too tiny is the invisible decay rate of positronium throu…
Implications on the mUED model from the early LHC data on $\ell+\met$ signal
Sanghyeon Chang, Kang Young Lee, Jeonghyeon Song
Recently the ATLAS and CMS collaborations reported their search for a new heavy gauge boson with one lepton plus missing transverse momentum. We find that , the secon…
Probing axino LSP from diphotons events with large missing transverse energy
Sanghyeon Chang, Kang Young Lee, Jeonghyeon Song
In a supersymmetry model with an axino as the lightest supersymmetric particle (LSP) and a Bino as the next LSP (NLSP), supersymmetry particles produced in pair at a high energy co…
Lepton flavour violation in a nonuniversal gauge interaction model
Kang Young Lee
The flavour-changing neutral currents (FCNC) are derived at tree level if the electroweak gauge group depends on the fermion family, which are absent in the standard model. We stud…
models with little Higgs
Soo-hyeon Nam, Kang Young Lee, Yong-Yeon Keum
We discuss the aspects of the fermions and gauge bosons in models with little Higgs. We introduce a set of fermions which ensures the cancellation of gauge…
Partially composite two-Higgs doublet model
Byungchul Chung, Kang Young Lee, Dong-Won Jung +1
In the extra dimensional scenarios with gauge fields in the bulk, the Kaluza-Klein (KK) gauge bosons can induce Nambu-Jona-Lasinio (NJL) type attractive four-fermion interactions,…
Enhancement of epsilon'/epsilon in the SU(2)_L times SU(2)_R times U(1) model
Ji-ho Jang, Kang Young Lee, Seong Chan Park +1
We explore the possible enhancement of direct CP violating parameter epsilon'/epsilon in the general left-right model based on the SU(2)_L times SU(2)_R times U(1) gauge group. The…
Spin configuration of top quark pair production with large extra dimensions at photon-photon colliders
Kang Young Lee, Seong Chan Park, H. S. Song +2
Top quark pair production at photon-photon colliders is studied in low scale quantum gravity scenario. From the dependence of the cross sections on the spin configuration of the to…
Large Extra Dimension Effects on the Spin Configuration of the Top Quark Pair at e^+ e^- Colliders
Kang Young Lee, H. S. Song, JeongHyeon Song +1
Large extra dimension effects on the spin configuration of the top quark pair at the process are studied. It is shown that the TeV scale quantum gravity effec…
Probing anomalous right--handed current in Z b bbar vertex
Kang Young Lee
Motivated by deviation from the Standard Model prediction for the forward--backward asymmetry of decay in the LEP data, we explore the anomalous couplings…
Polarization Effects on the process with Large Extra Dimensions
Kang Young Lee, H. S. Song, JeongHyeon Song
We study large extra dimension effects on the polarizations of the pair and electron beam at the process. It is shown that the measurements of the cross se…
Complete analysis of photino-mediated lepton flavor violaitons in generalized supersymmetric models
Yeong Gyun Kim, Pyungwon Ko, Jae Sik Lee +1
We consider lepton flavor violations (LFV) mediated by photino as a result of the nondiagonal slepton mass matrices in general supersymmetric models. Using the experimental upper b…
Bounds of the mass of Z' and the neutral mixing angles in general SU(2)_L x SU(2)_R x U(1) models
Junegone Chay, Kang Young Lee, Soo-hyeon Nam
We consider phenomenological constraints on the mass and the two mixing angles and of the neutral sector in a very general class of $SU(2)_L \times SU(2)…
Implications of the recent CERN LEP data on nonuniversal interactions with the precision electroweak tests
Kang Young Lee
We explore the nonuniversal interaction effects in terms of the precision variables epsilons with the recent LEP data reported by the Electroweak Working Group. The epsilon variabl…
New Precision Electroweak Tests in Supergravity Models
Gye T. Park, Kang Young Lee
We update the analysis of the precision electroweak tests in terms of 4 epsilon parameters, , to obtain more accurate experimental values of them by taking into accoun…