199 citations · 4.2k across the 135 of their papers we have counts for
11 papers · 1 filter
Chiral Dark Sector
Raymond T. Co, Keisuke Harigaya, Yasunori Nomura
We present a simple and natural dark sector model in which dark matter particles arise as composite states of hidden strong dynamics and their stability is ensured by accidental sy…
Minimal Mirror Twin Higgs
Riccardo Barbieri, Lawrence J. Hall, Keisuke Harigaya
In a Mirror Twin World with a maximally symmetric Higgs sector the little hierarchy of the Standard Model can be significantly mitigated, perhaps displacing the cutoff scale above…
Dark Sectors 2016 Workshop: Community Report
Jim Alexander, Marco Battaglieri, Bertrand Echenard +201
This report, based on the Dark Sectors workshop at SLAC in April 2016, summarizes the scientific importance of searches for dark sector dark matter and forces at masses beneath the…
Hubble induced mass after inflation in spectator field models
Tomohiro Fujita, Keisuke Harigaya
Spectator field models such as the curvaton scenario and the modulated reheating are attractive scenarios for the generation of the cosmic curvature perturbation, as the constraint…
GUTzilla Dark Matter
Keisuke Harigaya, Tongyan Lin, Hou Keong Lou
Motivated by gauge coupling unification and dark matter, we present an extension to the Standard Model where both are achieved by adding an extra new matter multiplet. Such conside…
Thermal Relic Dark Matter Beyond the Unitarity Limit
Keisuke Harigaya, Masahiro Ibe, Kunio Kaneta +2
We discuss a simple model of thermal relic dark matter whose mass can be much larger than the so-called unitarity limit on the mass of point-like particle dark matter. The model co…
750 GeV Diphotons: Implications for Supersymmetric Unification II
Lawrence J. Hall, Keisuke Harigaya, Yasunori Nomura
Perturbative supersymmetric gauge coupling unification is possible in six theories where complete SU(5) TeV-scale multiplets of vector matter account for the size of the reported $…
Hidden Pion Varieties in Composite Models for Diphoton Resonances
Keisuke Harigaya, Yasunori Nomura
The diphoton excesses at 750 GeV seen in the LHC data may be the first hint for new physics at the TeV scale. We discuss variations of the model considered earlier, in which one or…
Light Chiral Dark Sector
Keisuke Harigaya, Yasunori Nomura
An interesting possibility for dark matter is a scalar particle of mass of order 10 MeV-1 GeV, interacting with a U(1) gauge boson (dark photon) which mixes with the photon. We pre…
A Composite Model for the 750 GeV Diphoton Excess
Keisuke Harigaya, Yasunori Nomura
We study a simple model in which the recently reported 750 GeV diphoton excess arises from a composite pseudo Nambu-Goldstone boson---hidden pion---produced by gluon fusion and dec…
Cosmology with a Heavy Polonyi Field
Keisuke Harigaya, Taku Hayakawa, Masahiro Kawasaki +1
We consider a cosmologically consistent scenario with a heavy Polonyi field. The Polonyi field with a mass of decays before the Big-Bang Nucleosynthesis (…