3,117 research outputs found
Flavor Changing Neutral Currents in the Asymmetric Left-Right Gauge Model
In the
extension of the standard model, a minimal (but asymmetric) scalar sector
consists of one doublet and one bidoublet.
Previous and recent studies have shown that this choice is useful for
understanding neutrino mass as well as dark matter. The constraints from flavor
changing neutral currents mediated by the scalar sector are discussed in the
context of the latest experimental data
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
Multilepton Higgs Decays through the Dark Portal
The U(1)_D gauge sector containing one dark Higgs boson h_D and one dark
photon \gamma_D may be explored through the decays of the 126 GeV particle
discovered at the Large Hadron Collider (LHC), assumed here as the heavier mass
eigenstate h_1 in the mixing of the standard model h with h_D. The various
decays of h_1 to \gamma_D \gamma_D, h_2 h_2, h_2 \gamma_D \gamma_D and h_2 h_2
h_2 would yield multilepton final states through the mixing of \gamma_D with
the photon and the decay h_2 \to \gamma_D \gamma_D, where h_2 is the lighter
dark Higgs. Future searches for signals of multilepton jets at the LHC may
reveal the existence of this possible dark sector governed simply by the
original Abelian Higgs model.Comment: 20 pages, 9 figures, 2 tables. New section added for signals of
multilepton jets at the LHC-1
New Perspectives on Axion Misalignment Mechanism
A zero initial velocity of the axion field is assumed in the conventional
misalignment mechanism. We propose an alternative scenario where the initial
velocity is nonzero, which may arise from an explicit breaking of the PQ
symmetry in the early Universe. We demonstrate that, depending on the specifics
about the initial velocity and the time order of the PQ symmetry breaking vs.
inflation, this new scenario can alter the conventional prediction for the
axion relic abundance in different, potentially significant ways. As a result,
new viable parameter regions for axion dark matter may open up.Comment: 7 pages, 7 figure
Enhanced Early Galaxy Formation in JWST from Axion Dark Matter?
We demonstrate that enhanced early galaxy formation can generically arise in
axion-like particle (ALP) dark matter (DM) theories with the kinetic
misalignment mechanism, potentially addressing the excess recently observed by
the James Webb Space Telescope (JWST), while being consistent with existing
constraints. We identify viable parameter regions with the ALP mass in the
range of . In addition, we show that the
ALP parameter regions of interest can lead to intriguing complementary
signatures in the small-scale structure of DM halos and existing experimental
searches for ALPs.Comment: 6 pages, 5 figure
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