4,597 research outputs found
The THDM with the Inverse Seesaw Mechanisms
In this paper, we combine the -Two-Higgs-Doublet-Model (THDM) with
the inverse seesaw mechanisms. In this model, the Yukawa couplings involving
the sterile neutrinos and the exotic Higgs bosons can be of order one in the
case of a large . We calculated the corrections to the Z-resonance
parameters , , , together with the branching ratios, and the muon anomalous . Compared with the
current bounds and plans for the future colliders, we find that the corrections
to the electroweak parameters can be contrained or discovered in much of the
parameter space
Invisible Higgs Decay at the LHeC
The possibility that the 125 GeV Higgs boson may decay into invisible
non-standard-model (non-SM) particles is theoretically and phenomenologically
intriguing. In this letter we investigate the sensitivity of the Large Hadron
Electron Collider (LHeC) to an invisibly decaying Higgs, in its proposed high
luminosity running mode. We focus on the neutral current Higgs production
channel which offers more kinematical handles than its charged current
counterpart. The signal contains one electron, one jet and large missing
energy. With a cut-based parton level analysis, we estimate that if the
coupling is at its standard model (SM) value, then assuming an integrated
luminosity of 1\,\mbox{ab}^{-1} the LHeC with the proposed 60 GeV electron
beam (with polarization) and 7 TeV proton beam is capable of probing
at level. Good lepton
veto performance (especially hadronic veto) in the forward region is
crucial to the suppression of the dominant background. We also explicitly
point out the important role that may be played by the LHeC in probing a wide
class of exotic Higgs decay processes and emphasize the general function of
lepton-hadron colliders in precision study of new resonances after their
discovery in hadron-hadron collisions.Comment: 6 pages, 3 figures. Description of the backgrounds, analysis and
results is simplified. Results unchanged with respect to v2. References
update
Exotic Higgs Decay at the LHeC
We study the exotic decay of the 125 GeV Higgs boson () into a pair of
light spin-0 particles () which subsequently decays and results in a
final state. This decay mode is well motivated in the Next to Minimal
Supersymmetric Standard Model (NMSSM) and extended Higgs sector models. Instead
of searching at the Large Hadron Collider (LHC) and the High Luminosity Large
Hadron Collider (HL-LHC) which are beset by large Standard Model (SM)
backgrounds, we investigate this decay channel at the much cleaner Large Hadron
Electron Collider (LHeC). With some simple selection cuts this channel becomes
nearly free of background at this machine, in stark contrast with the
situation at the (HL-)LHC. With a parton level analysis we show that for the
mass range , with luminosity the LHeC is
generally capable of constraining
( denotes the coupling strength relative to
the SM value) to a few percent level ( CLs). With luminosity
at a few per mille level can be probed. These sensitivities are much
better than the HL-LHC performance and demonstrate the important role expected
to be played by the LHeC in probing exotic Higgs decay processes, in addition
to the already proposed invisible Higgs decay channel.Comment: 10 pages, 5 figures. Version accepted by EPJC. Tables and figures
updated after correcting a mistake in signal event generation. Results
essentially unchange
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