13 research outputs found
Probing Cosmic Neutrino Background Charge via Unconventional Interferometer
If neutrinos carry non-zero electric charge, they would interact directly
with photons. This would induce a phase shift along the photon path in the
optical experiment. We propose a novel idea to detect this phase shift induced
by cosmic neutrino background (CNB) and the photon interaction using laser
interferometry experiment. We show that our setup can probe the CNB neutrino
charge in the order of . This is quite competitive
with the existing upper bound on neutrino charge from both laboratory
experiments and astrophysical observations.Comment: 10 pages, 4 figure
Top Quark Rare Decays via Loop-Induced FCNC Interactions in Extended Mirror Fermion Model
Flavor changing neutral current (FCNC) interactions for a top quark
decays into with represents a neutral gauge or Higgs boson, and a
up- or charm-quark are highly suppressed in the Standard Model (SM) due to the
Glashow-Iliopoulos-Miami mechanism. Whilst current limits on the branching
ratios of these processes have been established at the order of from
the Large Hadron Collider experiments, SM predictions are at least nine orders
of magnitude below. In this work, we study some of these FCNC processes in the
context of an extended mirror fermion model, originally proposed to implement
the electroweak scale seesaw mechanism for non-sterile right-handed neutrinos.
We show that one can probe the process for a wide range of parameter
space with branching ratios varying from to , comparable
with various new physics models including the general two Higgs doublet model
with or without flavor violations at tree level, minimal supersymmetric
standard model with or without -parity, and extra dimension model.Comment: 30 pages, 8 figures, 2 tables and 1 appendix. Version to appear in
NP
Light Dark Matter Scattering in Gravitational Wave Detectors
We present prospects for discovering dark matter scattering in gravitational
wave detectors. The focus of this work is on light, particle dark matter with
masses below 1 GeV/c. We investigate how a potential signal compares to
typical backgrounds like thermal and quantum noise, first in a simple toy model
and then using KAGRA as a realistic example. That shows that for a discovery
much lighter and cooler mirrors would be needed. We also give some brief
comments on space-based experiments and future atomic interferometers.Comment: 26 pages, 5 figures; version published in Eur. Phys. J.
Millicharge Dark Matter Detection with Mach-Zehnder Interferometer
If the dark sector exists and communicates with Standard Model through the
mixing, it is possible that electromagnetism would have influence on
matter fields in dark sector, so-called millicharge particles (mCPs).
Furthermore, the highest mCPs could be dark matter particles. Recently it has
been shown that the mCPs would be slowed down and captured by the earth. As a
result, the number density of accumulated mCPs underground is enhanced by
several orders of magnitude as compared to that of dark matter in our solar
system. In this study, we propose to use the Mach-Zehnder (MZ) laser
interferometer to detect earth bound mCPs through the detection of phase shifts
of photons. We show that, for mass of mCPs lager than GeV, the sensitivity
of probing the mixing parameter could reach as low as if
number density is larger than .Comment: 12 pages, 4 figure
Lepton Flavor Violating Decays of Neutral Higgses in Extended Mirror Fermion Model
We perform the one-loop induced charged lepton flavor violating decays of the
neutral Higgses in an extended mirror fermion model with non-sterile
electroweak-scale right-handed neutrinos and a horizontal symmetry in the
lepton sector. We demonstrate that for the 125 GeV scalar there is tension
between the recent LHC result 1% and the
stringent limits on the rare processes and
or from low energy experiments.Comment: 23 pages, 3 figures. Added some of referenc
Exploring Dark Photon via Sub-Frequency Laser Search in Gravitational Wave Detectors
We propose a novel idea to detect dark photon in the gravitational wave (GW)
experiments. Our setups are capable to perform the whole process of dark photon
production, its decay products, and new physics signal discovery. This "mini
LHC" is inspired from the recent idea of the dark photon detection using the
laser light in light shinning through the wall (LSW) experiments such as ALPS
II. Taking the sub-frequency light emitted from the laser source as the new
physics signal, we show that the sensitivity of our proposal is two order
magnitude better than the original idea in the LSW studies.Comment: 5 figures, 1 tabl
Effects of new heavy fermions on complex scalar dark matter phenomenology in gauged two Higgs doublet model
We study the inclusion of new heavy fermions on complex scalar dark matter (DM) phenomenology within gauged two Higgs doublet model (G2HDM). We find that for DM mass above 1Â TeV, heavy quarks coannihilations into the Standard Model (SM) quarks and gluons dominate the thermally-averaged cross section relevant for the relic abundance of complex scalar DM. We demonstrate that the effects of QCD Sommerfeld correction as well as QCD bound state formation in determining the DM relic density are negligible. We show that the allowed parameter space is significantly constrained by the current PLANCK relic density data as well as XENON1T limit appropriate for DM direct search