scholarly journals One-loop corrections to the Higgs boson invisible decay in the dark doublet phase of the N2HDM

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
Duarte Azevedo ◽  
Pedro Gabriel ◽  
Margarete Mühlleitner ◽  
Kodai Sakurai ◽  
Rui Santos
Keyword(s):  
Dark Matter ◽  
Decay Width ◽  
Parameter Space ◽  
Hadron Collider ◽  
Branching Ratio ◽  
Vacuum Expectation ◽  
Higgs Doublet ◽  
Leading Order ◽  
Present Measurement ◽  
Invisible Decay

Abstract The Higgs invisible decay width may soon become a powerful tool to probe extensions of the Standard Model with dark matter candidates at the Large Hadron Collider. In this work, we calculate the next-to-leading order (NLO) electroweak corrections to the 125 GeV Higgs decay width into two dark matter particles. The model is the next-to-minimal 2-Higgs-doublet model (N2HDM) in the dark doublet phase, that is, only one doublet and the singlet acquire vacuum expectation values. We show that the present measurement of the Higgs invisible branching ratio, BR(H → invisible < 0.11), does not lead to constraints on the parameter space of the model at leading order. This is due to the very precise measurements of the Higgs couplings but could change in the near future. Furthermore, if NLO corrections are required not to be unphysically large, no limits on the parameter space can be extracted from the NLO results.

scholarly journals Exotic Higgs decays into displaced jets at the LHeC

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Kingman Cheung ◽  
Oliver Fischer ◽  
Zeren Simon Wang ◽  
Jose Zurita
Keyword(s):  
Higgs Boson ◽  
Parameter Space ◽  
Hadron Collider ◽  
Percent Level ◽  
Branching Ratio ◽  
Vacuum Expectation ◽  
Vacuum Expectation Value ◽  
Decay Length ◽  
Decay Modes ◽  
Scalar Particles

Abstract Profiling the Higgs boson requires the study of its non-standard decay modes. In this work we discuss the prospects of the Large Hadron electron Collider (LHeC) to detect scalar particles with masses ,≳ 10 GeV produced from decays of the Standard Model (SM) Higgs boson. These scalar particles decay mainly to bottom pairs, and in a vast portion of the allowed parameter space they acquire a macroscopic lifetime, hence giving rise to displaced hadronic vertices. The LHeC provides a very clean environment that allows for easy identification of these final states, in contrast to hadronic colliders where the overwhelming backgrounds and high pile-up render such searches incredibly challenging. We find that the LHeC provides a unique window of opportunity to detect scalar particles with masses between 10 and 30 GeV. In the Higgs Portal scenarios we can test the mixing angle squared, sin2α, as low as 10−5–10−7, with the exact value depending on the vacuum expectation value of the new scalar.Our results are also presented in a model-independent fashion in the lifetime-branching ratio and mass-branching ratio planes. We have found that exotic branching ratios of the Higgs boson at the sub-percent level can be probed, for the scalar decay length in the range 10−4 m ≲ cτ ≲ 10−1 m. The expected coverage of the parameter space largely exceeds the published sensitivity of the indirect reach at the high-luminosity Large Hadron Collider via the invisible Higgs branching ratio.

scholarly journals Constraining the Inert Doublet Model using Vector Boson Fusion

2019 ◽  
Vol 79 (11) ◽  
Author(s):  
Daniel Dercks ◽  
Tania Robens
Keyword(s):  
Dark Matter ◽  
Parameter Space ◽  
Vector Boson ◽  
Higgs Doublet ◽  
Dark Matter Candidate ◽  
Final States ◽  
Vector Boson Fusion ◽  
Doublet Model ◽  
Inert Doublet Model ◽  
Two Higgs Doublet Model

AbstractIn this work, we use a recast of the Run II search for invisible Higgs decays within Vector Boson Fusion to constrain the parameter space of the Inert Doublet model, a two Higgs doublet model with a dark matter candidate. When including all known theoretical as well as collider constraints, we find that the above can rule out a relatively large part in the $$m_H,\,\lambda _{345}$$mH,λ345 parameter space, for dark scalar masses $$m_H\,\le \,100\,{\mathrm{GeV}}$$mH≤100GeV. Including the latest dark matter constraints, a smaller part of parameter space remains which is solely excluded from the above analysis. We also discuss the sensitivity of monojet searches and multilepton final states from Run II.

scholarly journals The dark phases of the N2HDM

2020 ◽  
Vol 2020 (8) ◽  
Author(s):  
Isabell Engeln ◽  
Pedro Ferreira ◽  
M. Margarete Mühlleitner ◽  
Rui Santos ◽  
Jonas Wittbrodt
Keyword(s):  
Dark Matter ◽  
Large Hadron Collider ◽  
Standard Model ◽  
Hadron Collider ◽  
Higgs Doublet ◽  
Tree Level ◽  
Vacuum Structure ◽  
The Standard Model ◽  
Doublet Model ◽  
Specific Phase

Abstract We discuss the dark phases of the Next-to-2-Higgs Doublet model. The model is an extension of the Standard Model with an extra doublet and an extra singlet that has four distinct CP-conserving phases, three of which provide dark matter candidates. We discuss in detail the vacuum structure of the different phases and the issue of stability at tree-level of each phase. Taking into account the most relevant experimental and theoretical constraints, we found that there are combinations of measurements at the Large Hadron Collider that could single out a specific phase. The measurement of h125 → γγ together with the discovery of a new scalar with specific rates to τ+τ− or γγ could exclude some phases and point to a specific phase.

scholarly journals CONSTRAINTS ON SCALAR DARK MATTER FROM DIRECT EXPERIMENTAL SEARCHES

2011 ◽  
Vol 01 ◽  
pp. 257-265
Author(s):  
XIAO-GANG HE ◽  
TONG LI ◽  
XUE-QIAN LI ◽  
JUSAK TANDEAN ◽  
HO-CHIN TSAI
Keyword(s):  
Dark Matter ◽  
Gamma Ray ◽  
Massive Particle ◽  
Vacuum Expectation ◽  
Higgs Doublet ◽  
Elastic Cross Section ◽  
Dark Matter Candidate ◽  
Mixing Angle ◽  
Upper Limits ◽  
Two Higgs Doublet Model

The standard model (SM) plus a real gauge-singlet scalar field dubbed darkon (SM+D) is the simplest model possessing a weakly interacting massive particle (WIMP) dark-matter candidate. The upper limits for the WIMP-nucleon elastic cross-section as a function of WIMP mass from the recent XENON10 and CDMS II experiments rule out darkon mass ranges from 10 to (50, 70, 75) GeV for Higgs-boson masses of (120, 200, 350) GeV, respectively. This may exclude the possibility of the darkon providing an explanation for the gamma-ray excess observed in the EGRET data. We show that by extending the SM+D to a two-Higgs-doublet model plus a darkon the experimental constraints on the WIMP-nucleon interactions can be circumvented due to suppression occurring at some values of the product tan α tan β, with α being the neutral-Higgs mixing angle and tan β the ratio of vacuum expectation values of the Higgs doublets. We also comment on the implication of the darkon model for Higgs searches at the LHC.

scholarly journals PRIVATE HIGGS AT THE LHC

2013 ◽  
Vol 28 (28) ◽  
pp. 1350149 ◽  
Author(s):  
YONI BENTOV ◽  
A. ZEE
Keyword(s):  
Dark Matter ◽  
Degrees Of Freedom ◽  
Vacuum Expectation ◽  
Mass Hierarchy ◽  
Neutrino Mixing ◽  
Leading Order ◽  
Expectation Values ◽  
Mixing Angles ◽  
Yukawa Couplings

We study the LHC phenomenology of a general class of "Private Higgs" (PH) models, in which fermions obtain their masses from their own Higgs doublets with [Formula: see text] Yukawa couplings, and the mass hierarchy is translated into a dynamical chain of vacuum expectation values. This is accomplished by introducing a number of light gauge-singlet scalars, the "darkons," some of which could play the role of dark matter. These models allow for substantial modifications to the decays of the lightest Higgs boson, for instance through mixing with TeV-scale PH fields and light darkons: in particular, one could accommodate [Formula: see text] flavor-uncorrelated deviations from the SM [Formula: see text] vertices with TeV-scale degrees of freedom. We also discuss a new implementation of the PH framework, in which the quark and neutrino mixing angles arise as one-loop corrections to the leading order picture.

scholarly journals Leptophilic bosons and muon g-2 at lepton colliders

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Eung Jin Chun ◽  
Tanmoy Mondal
Keyword(s):  
Dark Matter ◽  
Parameter Space ◽  
Higgs Doublet ◽  
Lepton Colliders ◽  
Doublet Model ◽  
Two Higgs Doublet Model

Abstract 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.

scholarly journals The $$R^2$$-Higgs inflation with two Higgs doublets

2022 ◽  
Vol 82 (1) ◽  
Author(s):  
Sung Mook Lee ◽  
Tanmoy Modak ◽  
Kin-ya Oda ◽  
Tomo Takahashi
Keyword(s):  
Parameter Space ◽  
Linear Collider ◽  
Hadron Collider ◽  
International Linear Collider ◽  
Higgs Sector ◽  
Scalar Fields ◽  
Mass Range ◽  
Higgs Doublet ◽  
Doublet Model ◽  
Two Higgs Doublet Model

AbstractWe study $$R^2$$ R 2 -Higgs inflation in a model with two Higgs doublets in which the Higgs sector of the Standard Model is extended by an additional Higgs doublet, thereby four scalar fields are involved in the inflationary evolutions. We first derive the set of equations required to follow the inflationary dynamics in this two Higgs doublet model, allowing a nonminimal coupling between the Higgs-squared and the Ricci scalar R, as well as the $$R^2$$ R 2 term in the covariant formalism. By numerically solving the system of equations, we find that, in parameter space where a successful $$R^2$$ R 2 -Higgs inflation are realized and consistent with low energy constraints, the inflationary dynamics can be effectively described by a single slow-roll formalism even though four fields are involved in the model. We also argue that the parameter space favored by $$R^2$$ R 2 -Higgs inflation requires nearly degenerate masses for $$m_{\mathsf {H}}$$ m H , $$m_A$$ m A and $$m_{{\mathsf {H}}^{\pm }}$$ m H ± , where $${\mathsf {H}}$$ H , A, and $${\mathsf {H}}^{\pm }$$ H ± are the extra CP even, CP odd, and charged Higgs bosons in the general two Higgs doublet model taking renormalization group evolutions of the parameters into account. Discovery of such heavy scalars at the Large Hadron Collider (LHC) are possible if they are in the sub-TeV mass range. Indirect evidences may also emerge at the LHCb and Belle-II experiments, however, to probe the quasi degenerate mass spectra one would likely require high luminosity LHC or future lepton colliders such as the International Linear Collider and the Future Circular Collider.

scholarly journals Inert sextuplet scalar dark matter at the LHC and future colliders

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Dan-Yang Liu ◽  
Chengfeng Cai ◽  
Zhao-Huan Yu ◽  
Yu-Pan Zeng ◽  
Hong-Hao Zhang
Keyword(s):  
Dark Matter ◽  
Hadron Collider ◽  
Dark Matter Particle ◽  
Higgs Doublet ◽  
Electroweak Symmetry ◽  
Dark Sector ◽  
Singly Charged ◽  
Relic Abundance ◽  
Doubly Charged ◽  
Electroweak Precision

Abstract We study a dark matter model constructed by extending the standard model with an inert SU(2)L sextuplet scalar of hypercharge 1/2. The sextuplet components are split by the quartic couplings between the sextuplet and the Higgs doublet after electroweak symmetry breaking, resulting in a dark sector with one triply charged, two doubly charged, two singly charged, and two neutral scalars. The lighter neutral scalar boson acts as a dark matter particle. We investigate the constraints on this model from the monojet + "Image missing" and soft-dilepton + jets + "Image missing" searches at the 13 TeV Large Hadron Collider, as well as from the current electroweak precision test. Furthermore, we estimate the projected sensitivities of a 100 TeV pp collider and of a future e+e− collider, and find that such future projects could probe TeV mass scales. Nonetheless, such mass scales only correspond to a subdominant component of the observed relic abundance if the dark matter particles solely originate from thermal production.

scholarly journals FOURTH GENERATION MAJORANA NEUTRINO, DARK MATTER AND HIGGS PHYSICS

2014 ◽  
Vol 29 (02) ◽  
pp. 1450010 ◽  
Author(s):  
SHOU-SHAN BAO ◽  
XUE GONG ◽  
ZONG-GUO SI ◽  
YU-FENG ZHOU
Keyword(s):  
Dark Matter ◽  
Cross Sections ◽  
Global Analysis ◽  
Hadron Collider ◽  
Effective Cross Section ◽  
Majorana Neutrino ◽  
Fourth Generation ◽  
The Masses ◽  
Near Future ◽  
Invisible Decay

We consider extensions of the standard model with fourth generation fermions (SM4) in which extra symmetries are introduced such that the transitions between the fourth generation fermions and the ones in the first three generations are forbidden. In these models, the stringent lower bounds on the masses of fourth generation quarks from direct searches can be relaxed, and the lightest fourth neutrino is allowed to be stable and light enough to trigger the Higgs boson invisible decay. In addition, the fourth Majorana neutrino can be a subdominant but highly detectable dark matter component. We perform a global analysis of the current Large Hadron Collider (LHC) data on the Higgs production and decay in this type of SM4. The results show that the mass of the lightest fourth Majorana neutrino is confined in the range ~41–59 GeV. Within the allowed parameter space, the predicted effective cross-section for spin-independent DM–nucleon scattering is ~3×10-48–6×10-46 cm 2, which is close to the current XENON100 upper limit and is within the reach of the XENON1T experiment in the near future. The predicted spin-dependent cross sections can also reach ~8×10-40 cm 2.

scholarly journals Baryonic Higgs and dark matter

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
Pavel Fileviez Pérez ◽  
Clara Murgui ◽  
Alexis D. Plascencia
Keyword(s):  
Dark Matter ◽  
Gauge Theory ◽  
Gauge Theories ◽  
Direct Detection ◽  
Hadron Collider ◽  
Branching Ratio ◽  
Baryon Number ◽  
Matter Density ◽  
Dark Matter Candidate ◽  
Anomaly Cancellation

Abstract We discuss the correlation between dark matter and Higgs decays in gauge theories where the dark matter is predicted from anomaly cancellation. In these theories, the Higgs responsible for the breaking of the gauge symmetry generates the mass for the dark matter candidate. We investigate the Higgs decays in the minimal gauge theory for Baryon number. After imposing the dark matter density and direct detection constraints, we find that the new Higgs can have a large branching ratio into two photons or into dark matter. Furthermore, we discuss the production channels and the unique signatures at the Large Hadron Collider.

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