199 citations · 4.2k across the 135 of their papers we have counts for
16 papers · 1 filter
750 GeV Diphotons: Implications for Supersymmetric Unification
Lawrence J. Hall, Keisuke Harigaya, Yasunori Nomura
A recent signal of 750 GeV diphotons at the LHC can be explained within the framework of supersymmetric unification by the introduction of vector quarks and leptons with Yukawa cou…
Composite Models for the 750 GeV Diphoton Excess
Keisuke Harigaya, Yasunori Nomura
We present composite models explaining the diphoton excess of mass around 750 GeV recently reported by the LHC experiments.
ATLAS on-Z Excess via gluino-Higgsino-singlino decay chains in the NMSSM
Keisuke Harigaya, Masahiro Ibe, Teppei Kitahara
Recently the ATLAS experiment has reported 3.0 sigma excess in an on-Z signal region in searches for supersymmetric particles. We find that the next-to-minimal supersymmetric stand…
Revisiting R-invariant Direct Gauge Mediation
Cheng-Wei Chiang, Keisuke Harigaya, Masahiro Ibe +1
We revisit a special model of gauge mediated supersymmetry breaking, the "R-invariant direct gauge mediation." We pay particular attention to whether the model is consistent with t…
Gaugino mass in heavy sfermion scenario
Keisuke Harigaya
The heavy sfermion scenario is naturally realized when supersymmetry breaking fields are charged under some symmetry or are composite fields. There, scalar partners of standard mod…
Diboson Resonance as a Portal to Hidden Strong Dynamics
Cheng-Wei Chiang, Hajime Fukuda, Keisuke Harigaya +2
We propose a new explanation for excess events observed in the search for a high-mass resonance decaying into dibosons by the ATLAS experiment. The resonance is identified as a com…
Dynamics of Peccei-Quinn Breaking Field after Inflation and Axion Isocurvature Perturbations
Keisuke Harigaya, Masahiro Ibe, Masahiro Kawasaki +1
The Peccei-Quinn mechanism suffers from the problem of the isocurvature perturbations. The isocurvature perturbations are suppressed if the Peccei-Quinn breaking scale is large dur…
Mass-Splitting between Haves and Have-Nots (Symmetry vs. Grand Unified Theory)
Keisuke Harigaya, Masahiro Ibe, Motoo Suzuki
We revisit the long-standing problem of supersymmetric grand unified theory (GUT), the doublet-triplet splitting problem. We discuss whether symmetry which controls the μ term in t…
Revisiting the Minimal Chaotic Inflation Model
Keisuke Harigaya, Masahiro Ibe, Masahiro Kawasaki +1
We point out that the prediction of the minimal chaotic inflation model is altered if a scalar field takes a large field value close to the Planck scale during inflation due to a n…
Cosmological Selection of Multi-TeV Supersymmetry
Keisuke Harigaya, Masahiro Ibe, Kai Schmitz +1
We discuss a possible answer to the fundamental question of why nature would actually prefer low-scale supersymmetry, but end up with a supersymmetry scale that is not completely n…
Peccei-Quinn Symmetry from Dynamical Supersymmetry Breaking
Keisuke Harigaya, Masahiro Ibe, Kai Schmitz +1
The proximity of the Peccei-Quinn scale to the scale of supersymmetry breaking in models of pure gravity mediation hints at a common dynamical origin of these two scales. To demons…
Muon g-2 in Focus Point SUSY
Keisuke Harigaya, Tsutomu T. Yanagida, Norimi Yokozaki
We point out that the anomaly of the muon can be easily explained in a focus point supersymmetry scenario, which realizes the semi-natural supersymmetry. Among known focus po…
A Model of Visible QCD Axion
Hajime Fukuda, Keisuke Harigaya, Masahiro Ibe +1
We pursue a class of visible axion models where the axion mass is enhanced by strong dynamics in a mirrored copy of the Standard Model in the line of the idea put forward by Rubako…
Seminatural SUSY from Nonlinear Sigma Model
Keisuke Harigaya, Tsutomu T. Yanagida, Norimi Yokozaki
We present a new focus point supersymemtry breaking scenario based on the supersymmetric non-linear sigma model. In this non-linear sigma model, squarks and sleptons are iden…
Indirect Probe of Electroweak-Interacting Particles at Future Lepton Colliders
Keisuke Harigaya, Koji Ichikawa, Anirban Kundu +2
Various types of electroweak-interacting particles, which have non-trivial charges under the gauge symmetry, appear in various extensions…
Higgs mass 125 GeV and g-2 of the muon in Gaugino Mediation Model
Keisuke Harigaya, Tsutomu T. Yanagida, Norimi Yokozaki
Gaugino mediation is very attractive since it is free from the serious flavor problem in the supersymmetric standard model. We show that the observed Higgs boson mass at around 125…