-
Article
Probability and Impact Perspectives on Cost and Schedule Risks in International Construction Projects: An Empirical Investigation
Numerous studies about risk assessment have been conducted in academia, but there is still a gap between practice. To close this gap between practice and academia, researchers should understand and provide imp...
-
Article
Three-Phased Risk-Management Benchmark for Internationalization of Small and Medium-Sized Construction Companies
Small and medium-sized construction companies (SMCCs) typically lack the international experience of their large counterparts. International construction projects often are more uncertain than domestic project...
-
Article
Open AccessInelastic dark matter, small scale problems, and the XENON1T excess
We study a generic model in which the dark sector is composed of a Majorana dark matter χ1, its excited state χ2, both at the electroweak scale, and a light dark photon Z′ with mz′ ∼ 10−4 eV. The light Z′ enhance...
-
Article
Open AccessA connection between flavour anomaly, neutrino mass, and axion
We propose a minimal model in which the flavour anomaly in the b → sμ+μ− transition is connected to the breaking of Peccei-Quinn (PQ) symmetry. The flavour anomaly is explained from new physics contribution by in...
-
Article
Open AccessScalar dark matter behind b → sμμ anomaly
We construct a scalar dark matter model with U ...
-
Article
Open AccessDark matter for b → sμ+μ− anomaly in a gauged U(1)X model
We propose a new physics model which has a cold dark matter candidate and can explain the b → sμ+μ− anomaly at the same time. Our model includes a scalar quark
-
Article
Open AccessScalar dark matter search from the extended νTHDM
We consider a neutrino Two Higgs Doublet Model (νTHDM) in which neutrinos obtain naturally small Dirac masses from the soft symmetry breaking of a global U(1)X symmetry. We extended the model so the soft term is ...
-
Article
Open AccessDark matter physics in neutrino specific two Higgs doublet model
Although the seesaw mechanism is a natural explanation for the small neutrino masses, there are cases when the Majorana mass terms for the right-handed neutrinos are not allowed due to symmetry. In that case, ...
-
Article
Open AccessFlavor-changing Higgs decays in grand unification with minimal flavor violation
We consider the flavor-changing decays of the Higgs boson in a grand unified theory framework which is based on the SU(5) gauge group and implements the principle of minimal flavor violation. This allows us to...
-
Article
Open AccessTop-philic scalar Dark Matter with a vector-like fermionic top partner
We consider a simple extension of the Standard Model with a scalar top-philic Dark Matter (DM) S coupling, apart from the Higgs portal, exclusively to the right-handed top quark t
-
Article
Open AccessNaturally large radiative lepton flavor violating Higgs decay mediated by lepton-flavored dark matter
In the standard model (SM), lepton flavor violating (LFV) Higgs decay is absent at renormalizable level and thus it is a good probe to new physics. In this article we study a type of new physics that could lea...
-
Article
Open Access3.5 keV X-ray line signal from dark matter decay in local U(1)B−L extension of Zee-Babu model
We consider a local U(1)B−L extension of Zee-Babu model to explain the recently observed 3.5 keV X-ray line signal. The model has three Standard model (SM)-singlet Dirac fermions with different U(1)B−L charges. A...
-
Article
Open AccessFlavour dependent gauged radiative neutrino mass model
We propose a one-loop induced radiative neutrino mass model with anomaly free flavour dependent gauge symmetry: μ minus τ symmetry U(1)μ−τ. A neutrino mass matrix satisfying current experimental data can be obtai...
-
Article
Open AccessCan Zee-Babu model implemented with scalar dark matter explain both Fermi-LAT 130 GeV γ-ray excess and neutrino physics?
We extend the Zee-Babu model for the neutrino masses and mixings by first incorporating a scalar dark matter X with Z 2 symmetry and then X and a dark scalar φ with global U(1) symmetry. In the la...
-
Article
Singlet portal extensions of the standard seesaw models to a dark sector with local dark symmetry
Assuming (i ) the seesaw mechanism works for neutrino masses and mixings, (ii ) dark matter is absolutely stable due to unbroken U(1)X dark gauge symmetry, and (iii ) the singlet fields (H † ...
-
Article
Higgs portal vector dark matter: revisited
We revisit the Higgs portal vector dark matter model including a hidden sector Higgs field that generates the mass of the vector dark matter. The model becomes renormalizable and has two scalar bosons, the mix...
-
Article
Vacuum structure and stability of a singlet fermion dark matter model with a singlet scalar messenger
We consider the issue of vacuum stability and triviality bound of the singlet extension of the Standard Model (SM) with a singlet fermion dark matter (DM). In this model, the singlet scalar plays the role of a...
-
Article
Search for the Higgs portal to a singlet fermionic dark matter at the LHC
We consider a simple extension of the standard model with a singlet fermionic dark matter. Its thermal relic density can be easily accommodated by a real singlet scalar messenger that mixes with the standard m...
-
Article
Neutral gauge boson contributions to the dimuon charge asymmetry in B decays
Recently, the DØ Collaboration measured the CP-violating like-sign dimuon charge asymmetry in neutral B decays, finding a 3.2σ difference from the standard-model (SM) prediction. Anon-SM charge asymmetry a ...
