scholarly journals Doubly Charged Higgs Bosons and Spontaneous Symmetry Breaking at eV and TeV Scales

Symmetry ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 153
Author(s):  
Janusz Gluza ◽  
Magdalena Kordiaczyńska ◽  
Tripurari Srivastava
Keyword(s):  
Gauge Group ◽  
Vacuum Expectation ◽  
Higgs Bosons ◽  
Symmetric Model ◽  
Charged Scalar ◽  
Scalar Particles ◽  
Lepton Flavor ◽  
Triplet Model ◽  
Standard Models ◽  
Doubly Charged

In this paper, beyond standard models are considered with additional scalar triplets without modification of the gauge group (Higgs Triplet Model—HTM) and with an extended gauge group S U ( 2 ) R ⊗ S U ( 2 ) L ⊗ U ( 1 ) (Left–Right Symmetric Model—LRSM). These models differ drastically in possible triplet vacuum expectation values (VEV). Within the HTM, we needed to keep the triplet VEV at most within the range of GeV to keep the electroweak ρ parameter strictly close to 1, down to electronvolts due to the low energy constraints on lepton flavor-violating processes and neutrino oscillation parameters. For LRSM, the scale connected with the S U ( 2 ) R triplet is relevant, and to provide proper masses of non-standard gauge bosons, VEV should at least be at the TeV level. Both models predict the existence of doubly charged scalar particles. In this paper, their production in the e + e − collider is examined for making a distinction in the s- and t- channels between the two models in scenarios when masses of doubly charged scalars are the same.

Production of singly and doubly charged Higgs bosons from Higgs triplet model at future linear colliders

2015 ◽  
Vol 30 (16) ◽  
pp. 1550096 ◽  
Author(s):  
Jie-Fen Shen ◽  
Yan-Ping Bi ◽  
Yi Yu ◽  
Yan-Ju Zhang
Keyword(s):  
Production Cross ◽  
Vacuum Expectation ◽  
High Energy ◽  
New Physics ◽  
Higgs Bosons ◽  
Charged Higgs ◽  
Triplet Model ◽  
Charged Higgs Bosons ◽  
Doubly Charged ◽  
Higgs Triplet Model

The singly and doubly charged Higgs bosons (H± and H±±) are the typical particles predicted in the Higgs Triplet Model and the observation of these particles can be regarded as the direct evidence of new physics. In this paper, we focus on the study of the singly and doubly charged Higgs bosons associated production process: e+e- → H+H--W+. We present the production cross sections and the distributions of the transverse momenta and the rapidity distributions for outgoing particles. The numerical results show that the production rates can reach the level of several fb with reasonable parameter values. So, one can expect that enough signals could be produced in the future high-energy e+e- collider experiments. The relevant SM backgrounds are also discussed in the case that the vacuum expectation value of the triplet is around 1 GeV.

scholarly journals Charged lepton flavor violating processes in neutrinophilic Higgs + seesaw model

2020 ◽  
Vol 2020 (7) ◽  
Author(s):  
Naoyuki Haba ◽  
Tsuneharu Omija ◽  
Toshifumi Yamada
Keyword(s):  
Charged Lepton ◽  
Higgs Field ◽  
Vacuum Expectation ◽  
Vacuum Expectation Value ◽  
Charged Scalar ◽  
Yukawa Couplings ◽  
Scalar Particles ◽  
Lepton Flavor ◽  
Seesaw Model ◽  
The Right

Abstract We investigate charged lepton flavor violating (CLFV) processes in the “neutrinophilic Higgs + seesaw model”, in which right-handed neutrinos couple only with an extra Higgs field which develops a tiny vacuum expectation value and the right-handed neutrinos also have Majorana mass. The model realizes a seesaw mechanism around TeV scale without extremely small Dirac Yukawa couplings. A phenomenological feature of the model is CLFV processes induced by loop diagrams of the charged scalar particles and heavy neutrinos. Therefore, first we constrain the model’s parameter space from the search for $\mu\to e\gamma$. Next, we predict the branching ratios of other CLFV processes including the $\mu\to3e$, $\mu+{\rm Al}\to e+{\rm Al}$, $\mu+{\rm Ti}\to e+{\rm Ti}$, $Z\to e\mu$, $Z\to e\tau$, $Z\to \mu\tau$, $h\to e\tau$ and $h\to\mu\tau$ processes, and discuss their detectability in future experiments.

scholarly journals Muon and electron g − 2 and the origin of the fermion mass hierarchy

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Naoyuki Haba ◽  
Yasuhiro Shimizu ◽  
Toshifumi Yamada
Keyword(s):  
Charged Lepton ◽  
Higgs Sector ◽  
Vacuum Expectation ◽  
Fermion Mass ◽  
Mass Hierarchy ◽  
Lepton Flavor Violation ◽  
Scalar Particles ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Charged Leptons

Abstract We present a model that gives a natural explanation to the charged lepton mass hierarchy and study the contributions to the electron and the muon $g-2$. In the model, we introduce lepton-flavor-dependent $U(1)_F$ symmetry and three additional Higgs doublets with $U(1)_F$ charges, to realize that each generation of charged leptons couples to one of the three additional Higgs doublets. The $U(1)_F$ symmetry is softly broken by $+1$ charges, and the smallness of the soft breaking naturally gives rise to the hierarchy of the Higgs vacuum expectation values, which then accounts for the charged lepton mass hierarchy. Since electron and muon couple to different scalar particles, each scalar contributes to the electron and the muon $g-2$ differently. We survey the space of parameters of the Higgs sector and find that there are sets of parameters that explain the muon $g-2$ discrepancy. On the other hand, we cannot find parameter sets that can explain the $g-2$ discrepancy within 2 $\sigma$. Here, the $U(1)_F$ symmetry suppresses charged lepton flavor violation.

scholarly journals Reconciling(g−2)μand charged lepton flavor violating processes through a doubly charged scalar

2016 ◽  
Vol 93 (11) ◽  
Author(s):  
Joydeep Chakrabortty ◽  
Pradipta Ghosh ◽  
Subhadeep Mondal ◽  
Tripurari Srivastava
Keyword(s):  
Charged Lepton ◽  
Charged Scalar ◽  
Lepton Flavor ◽  
Doubly Charged

scholarly journals One-loop Form Factors for \(H\rightarrow \gamma^*\gamma^*\) in \(R_{\xi}\) Gauge

2021 ◽  
Vol 32 ◽  
Author(s):  
Khiem Hong Phan ◽  
Dzung Tri Tran
Keyword(s):  
Standard Model ◽  
Form Factors ◽  
Numerical Results ◽  
Good Stability ◽  
Charged Scalar ◽  
Scalar Particles ◽  
Standard Models ◽  
Loop Form

In this paper, we present general one-loop form factors for \(H\rightarrow \gamma^* \gamma^*\) in \(R_{\xi}\) gauge, considering all cases of two on-shell, one on-shell and two off-shell for final photons. The calculations are performed in standard model and in arbitrary beyond the standard models which charged scalar particles may be exchanged in one-loop diagrams. Analytic results for the form factors are shown in general forms which are expressed in terms of the Passarino-Veltman functions. We also confirm the results in previous computations which are available for the case of two on-shell photons. The \(\xi\)-independent of the result is also discussed. We find that numerical results are good stability with varying \(\xi=0,1\) and $\xi\rightarrow \infty\).

scholarly journals Lepton flavor violation and collider searches in a type I + II seesaw model

2019 ◽  
Vol 79 (11) ◽  
Author(s):  
Manoel M. Ferreira ◽  
Tessio B. de Melo ◽  
Sergey Kovalenko ◽  
Paulo R. D. Pinheiro ◽  
Farinaldo S. Queiroz
Keyword(s):  
Standard Model ◽  
New Physics ◽  
Neutrino Masses ◽  
Type I ◽  
Lepton Flavor Violation ◽  
Charged Scalar ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
The Standard Model ◽  
Doubly Charged

AbstractNeutrinos are massless in the Standard Model. The most popular mechanism to generate neutrino masses are the type I and type II seesaw, where right-handed neutrinos and a scalar triplet are augmented to the Standard Model, respectively. In this work, we discuss a model where a type I + II seesaw mechanism naturally arises via spontaneous symmetry breaking of an enlarged gauge group. Lepton flavor violation is a common feature in such setup and for this reason, we compute the model contribution to the $$\mu \rightarrow e\gamma $$μ→eγ and $$\mu \rightarrow 3e$$μ→3e decays. Moreover, we explore the connection between the neutrino mass ordering and lepton flavor violation in perspective with the LHC, HL-LHC and HE-LHC sensitivities to the doubly charged scalar stemming from the Higgs triplet. Our results explicitly show the importance of searching for signs of lepton flavor violation in collider and muon decays. The conclusion about which probe yields stronger bounds depends strongly on the mass ordering adopted, the absolute neutrino masses and which much decay one considers. In the 1–5 TeV mass region of the doubly charged scalar, lepton flavor violation experiments and colliders offer orthogonal and complementary probes. Thus if a signal is observed in one of the two new physics searches, the other will be able to assess whether it stems from a seesaw framework.

scholarly journals The Higgs boson decays with the lepton flavor violation

2018 ◽  
Vol 33 (17) ◽  
pp. 1850103 ◽  
Author(s):  
O. M. Boyarkin ◽  
G. G. Boyarkina ◽  
D. S. Vasileuskaya
Keyword(s):  
Higgs Boson ◽  
Branching Ratio ◽  
Vacuum Expectation ◽  
Theoretical Expression ◽  
Symmetric Model ◽  
Third Order ◽  
Mixing Angle ◽  
Neutrino Sector ◽  
Lepton Flavor ◽  
Decay Widths

Within the left–right symmetric model (LRM), the decays [Formula: see text] where [Formula: see text] is an analog of the Standard Model Higgs boson, are considered. The widths of this decays are found in the third-order of the perturbation theory. Since the main contribution to the decay widths is caused by the diagram with the light and heavy neutrinos in the virtual state, then investigation of this decays could shed light upon the neutrino sector structure. The obtained decay widths critically depend on the charged gauge bosons mixing angle [Formula: see text] and the heavy–light neutrinos mixing angle [Formula: see text]. The LRM predicts the values of these angles as functions of the vacuum expectation values [Formula: see text] and [Formula: see text]. Using the results of the existing experiments, on looking for the additional charged gauge boson [Formula: see text] and on measuring the electroweak [Formula: see text] parameter, gives [Formula: see text] However, even using the upper bounds on [Formula: see text] and [Formula: see text], one does not manage to get the upper experimental bound on the branching ratio [Formula: see text] being equal to [Formula: see text]. The theoretical expression proves to be on two orders of magnitude less than [Formula: see text].

Pair production of doubly charged Higgs boson at photon linear collider in the Higgs triplet model

2014 ◽  
Vol 29 (10) ◽  
pp. 1450041 ◽  
Author(s):  
Jun Cao ◽  
Jie-Fen Shen
Keyword(s):  
Higgs Boson ◽  
Pair Production ◽  
Cross Sections ◽  
Linear Collider ◽  
Higgs Bosons ◽  
Charged Higgs ◽  
Triplet Model ◽  
Charged Higgs Bosons ◽  
Doubly Charged ◽  
Higgs Triplet Model

The characteristic feature of the Higgs Triplet Model (HTM) is the existence of the doubly charged Higgs bosons H±±. In this paper, we study the pair production of doubly charged Higgs bosons in γγ collisions at the International Linear Collider (ILC). We present the production cross-sections and the distributions of the various observables, i.e. the distributions of the transverse momenta, the rapidity distributions for doubly charged Higgs bosons and the production angle distributions of the charged Higgs boson pair. Our numerical results show that, the values of the unpolarized cross-sections can reach a few hundreds of fb. We also study the possible final state for the decay mode H±±→W±W± and relevant Standard Model (SM) background. Due to high produced rate and small SM background, the possible signals of H±± might be detected via this process in the future ILC experiments.

scholarly journals Production of the Doubly Charged Higgs Boson in Association with the SM Gauge Bosons and/or Other HTM Scalars at Hadron Colliders

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1240
Author(s):  
Bartosz Dziewit ◽  
Magdalena Kordiaczyńska ◽  
Tripurari Srivastava
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Charged Higgs Boson ◽  
Higgs Bosons ◽  
Hadron Colliders ◽  
Gauge Bosons ◽  
Charged Scalar ◽  
The Standard Model ◽  
Charged Higgs ◽  
Doubly Charged

We investigate an extension of the Standard Model with one additional triplet of scalar bosons. Altogether, the model contains four Higgs bosons. We analyze the associated production of the doubly charged scalar with the Standard Model gauge bosons and the remaining Higgs bosons of the model, which are: the light (SM) and heavy neutral scalars and a singly charged scalar. We estimate, in the context of the present (HL–LHC) and future (FCC–hh) hadron colliders, the most promising processes in which a single produced doubly charged Higgs boson is involved.

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