128 citations · 989 across the 57 of their papers we have counts for
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AMS02 positron excess from decaying fermion DM with local dark gauge symmetry
P. Ko, Yong Tang
Positron excess observed by PAMELA, Fermi and AMS02 may be due to dark matter (DM) pair annihilation or decay dominantly into muons. In this paper, we consider a scenario with ther…
Galactic center -ray excess in hidden sector DM models with dark gauge symmetries: local symmetry as an example
P. Ko, Yong Tang
Hidden sector dark matter (DM) models with local dark gauge symmetry make a natural playground for the -ray excess from the galactic center (GC). In this paper, we first discuss…
Two Higgs doublet models with local U(1)_H gauge symmetry and dark matter
P. Ko, Yuji Omura, Chaehyun Yu
We propose to implement the softly broken Z_2 symmetry in the usual two Higgs doublet model (2HDM) to spontaneously broken local U(1)_H gauge symmetry, and show that the resulting…
Renormalization group-induced phenomena of top pairs from four-quark effective operators
Sunghoon Jung, P. Ko, Yeo Woong Yoon +1
We study the renormalization group(RG) evolution of four-quark operators that contribute to the top pair production. In particular, we focus on the cases in which certain observabl…
The 3.5 keV X-ray line signature from annihilating and decaying dark matter in Weinberg model
Seungwon Baek, P. Ko, Wan-Il Park
Recently two groups independently observed unidentified X-ray line signal at the energy 3.55 keV from the galaxy clusters and Andromeda galaxy. We show that this anomalous signal c…
Invisible Higgs Decay Width vs. Dark Matter Direct Detection Cross Section in Higgs Portal Dark Matter Models
Seungwon Baek, P. Ko, Wan-Il Park
The correlation between the invisible Higgs branching ratio () vs. dark matter (DM) direct detection () in Higgs portal DM models is usually presented…