A
bstract
We consider the two Higgs doublet model (2HDM) along with a generation of vector-like lepton doublet and singlet to explain the observed discrepancies in the electron and muon anomalous ...magnetic moments. The type-X (lepton-specific) 2HDM can allow a light pseudo-scalar which is known to explain the muon anomalous magnetic moment at two-loop. Such a light particle induces a sizable negative contribution to the electron anomalous magnetic moment at one-loop in the presence of vector-like leptons evading all the experimental constraints.
A
bstract
A light leptophilic boson (scalar or pseudoscalar) has been postulated to explain the muon g-2 anomaly and could be a portal to dark matter. Realizing the leptophilic nature of a singlet ...boson in the framework of the two-Higgs-doublet-Model of type-X, we identify the parameter space viable for the explanation of the updated muon g-2 discrepancy. It is then shown that such a hypothetical particle will be unambiguously ruled out or discovered via the Yukawa process at a lepton collider designed as a Higgs factory.
A
bstract
We explored the prospect of looking for a fermiophobic charged Higgs (
H
±
) via the same sign trilepton signal at the LHC. A fermiophobic scenario appears in the type-I two Higgs doublet ...model where the coupling of the
H
±
with the Standard Model fermions is inversely proportional to tan
β
. Almost all the experimental searches rely on the fermionic production and decay of the charged Higgs. Consequently, the limit on
H
±
for fermiophobic scenarios is non-existent unless tan
β
is small. We show that for a fermiophobic case, the electroweak production of
H
±
is dominant for most of the parameter space. Subsequent bosonic decay of the charged and neutral Higgses give rise to the same sign trilepton signal. With a thorough phenomenological analysis, we demonstrate that the same sign trilepton signal can be an excellent complementary search to explore the high tan
β
regions.
We explore the prospect of Yukawa production of a light boson which can exist in an extended Higgs sector. A particularly interesting case is the light pseudoscalar in Type-X two Higgs doublet model ...which can explain the anomalous magnetic moment of muon at large tanβ. Considering ILC Higgs factory with s=250 GeV, we show that the available parameter space can be fully examined by the (tau) Yukawa process at 5σ. We also demonstrate the mass reconstruction of such a light particle which helps to sizably minimize the background events.
We propose a gauged U(1)B−L extended two Higgs doublet model to explain both neutrino mass and lepton anomalous magnetic moments (g−2). Neutrino mass is generated via an inverse seesaw mechanism by ...introducing singlet fermions. Especially, we update the result of muon (g−2) in light of the very recent report by E989 experiment at Fermilab, indicating aμFNAL=116592040(54)×10−11. Combining BNL result, we have the following deviation from the standard model prediction Δaμ=(2.51±5.9)×10−10 at 4.2 σ. Thanks to an appropriate assignment for U(1)B−L×Z2 symmetry and larger (20≲)tanβ that is favored by type-X model, we realize natural hierarchies among neutral fermions. The lepton anomalous magnetic moments can be induced at the one loop level by introducing an iso-spin singlet singly-charged boson. This charged scalar plays a significant role in evading chiral suppression of these phenomenologies. We show sizable lepton (g−2) can be obtained after satisfying all the flavor constraints, such as μ→eγ and flavor conserving leptonic Z boson decays.
A
bstract
The CP violating two-Higgs doublet model of type-X may enhance significantly the electric and magnetic moment of leptons through two-loop Barr-Zee diagrams. We analyze the general parameter ...space of the type-X 2HDM consistent with the muon
g −
2 and the electron EDM measurements to show how strongly the CP violating parameter is constrained in the region explaining the muon
g −
2 anomaly.
In this manuscript, we have reported pro-oxidant activity of GdOF nanostructures under dark condition which primarily depends on morphology and defect structure. As examined from FTIR, Raman, and ...photoluminescence spectroscopy, defects are found to be neutral oxygen (
V
O
) and singly charged oxygen (
V
O
+
) vacancies. In order to check stability of GdOF, we have calculated vibration band structure, while electronic band structure has been calculated to get insight about band-to-band electronic transition and other electronic phenomena, specifically in determining pro-oxidant activity. Herein, our calculation confirms spin-polarized conduction band originating from Gd 5p states and spin-polarized valance band which consists of O 2p orbitals. Our calculation underestimates experimental band gap, but corroborates previously studied magnetic property of GdOF. As previous studies highlight GdOF as MRI and fluorescent contrast agent, thus present investigation on pro-oxidant activity of GdOF widens its scope in photodynamic therapy indicating its theranostic capability.
To understand physics beyond the standard model it is important to have the precise knowledge of Higgs boson and top quark masses as well as strong coupling. A recently discovered new boson which is ...likely to be the standard model Higgs with mass 123-127 GeV has a submissive impact on the stability of the new physics beyond standard model. The beyond standard model scenarios that include many scalar fields posses scalar potential with many quartic couplings. Due to the complicated structures of such scalar potentials it is indeed difficult to adjudge the stability of the vacuum. Thus one needs to formulate a proper prescription for computing the vacuum stability criteria. In this paper we have used the idea of copositive matrices to deduce the conditions that guarantee the boundedness of the scalar potential. We have discussed the basic idea behind the copositivity and then used that to determine the vacuum stability criteria for the left-right symmetric models with doublet and triplet scalars and Type-II seesaw. As this idea is based on the strong mathematical arguments, it helps to compute simple and unique stability criteria embracing the maximum allowed parameter space.
Recently the study of anomalous gamma-ray emission in the regions surrounding the galactic center has drawn a lot of attention as it points out that the excess of ∼1–3 GeV gamma-ray in the low ...latitude is consistent with the emission expected from annihilating dark matter. The best-fit to the gamma-ray spectrum corresponds to dark matter (DM) candidate having mass in the range ∼31–40 GeV annihilating into bb¯-pair with cross-section 〈σv〉=(1.4–2.0)×10−26 cm3s−1. We have shown that the Higgs-portal dark matter models in presence of scalar resonance (in the annihilation channel) are well-suited for explaining these phenomena. In addition, the parameter space of these models also satisfies constraints from the LHC Higgs searches, relic abundance and direct detection experiments. We also comment on real singlet scalar Higgs-portal DM model which is found to be incompatible with the recent analysis.
A
bstract
We discuss scenarios with wrong-sign (WS) Yukawa couplings for the discovered Higgs boson in the Yukawa-aligned two Higgs doublet model. In the WS scenario, Yukawa couplings for down-type ...quarks and/or charged leptons have an opposite sign as compared to those of the Higgs boson in the standard model, which can be consistent with current flavor data and the Higgs signal strengths. The phenomenology of additional Higgs bosons in such a scenario can be significantly different from that with right-sign Yukawa couplings, mainly due to a larger Higgs boson mixing to be required in the wrong-sign case. We show the parameter space which is excluded or explored by direct searches for the additional Higgs bosons at the current and high-luminosity LHC under the constraints from perturbative unitarity and vacuum stability. In particular, we find that most of the parameter space is explored in the WS scenario with the Type-X (lepton specific) Yukawa interaction which is a special case of the Yukawa alignment realized by imposing a softly-broken ℤ
2
symmetry. We propose that multi-Higgs events from pair productions of the additional Higgs bosons can be the smoking gun signature to probe the WS scenario, and give the expected number of events at the high-luminosity LHC.
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