Publications (22)
Asymmetric Dark Matter Models in SO(10)
Natsumi Nagata, Keith A. Olive, Jiaming Zheng
We systematically study the possibilities for asymmetric dark matter in the context of non-supersymmetric SO(10) models of grand unification. Dark matter stability in SO(10) is gua…
Axion Emission from Proton Cooper Pairs in Neutron Stars
Koichi Hamaguchi, Natsumi Nagata, Jiaming Zheng
We investigate axion emission from singlet proton Cooper pairs in neutron stars, a process that dominates axion emission in young neutron stars in the KSVZ model. By re-deriving it…
Probing Light Inelastic Dark Matter from Direct Detection
Hong-Jian He, Yu-Chen Wang, Jiaming Zheng
For dark matter (DM) direct detections, the kinematic effects such as those of the inelastic scattering can play important role in light DM searches. The light DM detection is gene…
Electroweak Loop Contributions to the Direct Detection of Wino Dark Matter
John Ellis, Natsumi Nagata, Keith A. Olive +1
Electroweak loop corrections to the matrix elements for the spin-independent scattering of cold dark matter particles on nuclei are generally small, typically below the uncertainty…
Capture of Electroweak Multiplet Dark Matter in Neutron Stars
Motoko Fujiwara, Koichi Hamaguchi, Natsumi Nagata +1
If dark matter has a sizable scattering cross section with nucleons, it can efficiently be captured by a neutron star. Its energy is then transferred to the neutron star as heat th…
Deeply Learned Preselection of Higgs Dijet Decays at Future Lepton Colliders
So Chigusa, Shu Li, Yuichiro Nakai +3
Future electron-positron colliders will play a leading role in the precision measurement of Higgs boson couplings which is one of the central interests in particle physics. Aiming…
The ATLAS Diboson Resonance in Non-Supersymmetric SO(10)
Jason L. Evans, Natsumi Nagata, Keith A. Olive +1
SO(10) grand unification accommodates intermediate gauge symmetries with which gauge coupling unification can be realized without supersymmetry. In this paper, we discuss the possi…
UV Completion of Neutral Triple Gauge Couplings
John Ellis, Hong-Jian He, Rui-Qing Xiao +2
Neutral triple gauge couplings (nTGCs) are manifestation of new physics beyond the Standard Model (SM), as they are absent in the SM and are first generated by dimension-8 operator…
Post-Inflationary Dark Matter Bremsstrahlung
Yann Mambrini, Keith A. Olive, Jiaming Zheng
Dark matter may only interact with the visible sector efficiently at energy scales above the inflaton mass, such as the Planck scale or the grand unification scale. In such a scena…
Resolving Hubble Tension by Self-Interacting Neutrinos with Dirac Seesaw
Hong-Jian He, Yin-Zhe Ma, Jiaming Zheng
Self-interacting neutrinos that begin to free-stream at close to matter-radiation equality can reduce the physical size of photon sound horizon at last scattering surface. This mec…
Collapsing domain walls with -violating coupling to thermalized fermions and their impact on gravitational wave detections
Qing-Quan Zeng, Xi He, Zhao-Huan Yu +1
We study the dynamics of domain walls formed through the spontaneous breaking of an approximate symmetry in a scalar field, focusing on their collapse under the infl…
Supernova-scope for the Direct Search of Supernova Axions
Shao-Feng Ge, Koichi Hamaguchi, Koichi Ichimura +5
If a supernova explosion occurs within a few hundred parsecs from the Earth, a huge number of axions, in addition to neutrinos, may arrive at the Earth. In this paper, we discuss i…
GeV Scale Inelastic Dark Matter with Dark Photon Mediator via Direct Detection and Cosmological/Laboratory Constraints
Hong-Jian He, Yu-Chen Wang, Jiaming Zheng
We propose a new candidate of GeV scale inelastic dark matter (DM). Our construction has an anomaly-free gauge group with dark photon mediator, and can realize either s…
Limit on the Axion Decay Constant from the Cooling Neutron Star in Cassiopeia A
Koichi Hamaguchi, Natsumi Nagata, Keisuke Yanagi +1
The observed rapid cooling of the neutron star (NS) located at the center of the supernova remnant Cassiopeia A (Cas A) can be explained in the minimal NS cooling scenario. This co…
Implications of Gravitational Waves for Supersymmetric Grand Unification
So Chigusa, Yuichiro Nakai, Jiaming Zheng
Supersymmetric grand unification based on is one of the most attractive paradigms in physics beyond the Standard Model. Inspired by the recent NANOGrav signal, we discuss…
Collider Interplay for Supersymmetry, Higgs and Dark Matter
O. Buchmueller, M. Citron, J. Ellis +5
We discuss the potential impacts on the CMSSM of future LHC runs and possible electron-positron and higher-energy proton-proton colliders, considering searches for supersymmetry vi…
Vacuum Stability and Radiative Electroweak Symmetry Breaking in an SO(10) Dark Matter Model
Yann Mambrini, Natsumi Nagata, Keith A. Olive +1
Vacuum stability in the Standard Model is problematic as the Higgs quartic self-coupling runs negative at a renormalization scale of about GeV. We consider a non-supersym…
Weakly-Interacting Massive Particles in Non-supersymmetric SO(10) Grand Unified Models
Natsumi Nagata, Keith A. Olive, Jiaming Zheng
Non-supersymmetric SO(10) grand unified theories provide a framework in which the stability of dark matter is explained while gauge coupling unification is realized. In this work,…
Dark Matter and Gauge Coupling Unification in Non-supersymmetric SO(10) Grand Unified Models
Yann Mambrini, Natsumi Nagata, Keith A. Olive +2
Unlike minimal SU(5), SO(10) provides a straightforward path towards gauge coupling unification by modifying the renormalization group evolution of the gauge couplings above some i…
Stop Coannihilation in the CMSSM and SubGUT Models
John Ellis, Jason L. Evans, Feng Luo +2
Stop coannihilation may bring the relic density of heavy supersymmetric dark matter particles into the range allowed by cosmology. The efficiency of this process is enhanced by sto…
EFT Approach of Inelastic Dark Matter for Xenon Electron Recoil Detection
Hong-Jian He, Yu-Chen Wang, Jiaming Zheng
Measuring dark matter (DM) signals via electron recoil provides an important means for direct detection of light DM particles. The recent XENON1T anomaly with electron recoil energ…
The Extent of the Stop Coannihilation Strip
John Ellis, Keith A. Olive, Jiaming Zheng
Many supersymmetric models such as the CMSSM feature a strip in parameter space where the lightest neutralino Ïis identified as the lightest supersymmetric particle (LSP), the lig…