Left-right Twin Higgs Research Articles

Muon g-2 anomaly confronted with the higgs global data in the left-right twin Higgs models

We will examine the muon g-2 anomaly with the background of the Higgs global fit data in the framework of the Left-Right Twin Higgs (LRTH) Models. The joint constrains of the precision electroweak data, the 125 GeV Higgs data, the leptonic flavor changing decay mu rightarrow egamma decays, and the mass requirement of the right-handed neutrino nu _R, the vector-like top partner T and the heavy gauge boson W_H, m_{nu _R}>m_T>m_{W_H}, are all considered in our calculation. Furthermore, since the neutral scalar phi ^0 may be lighter than the 125 GeV Higgs, the direct searches from the hrightarrow phi ^0phi ^0 channels can impose stringent upper limits on Br(hrightarrow phi ^0phi ^0), which will reduce the allowed region of m_{phi ^0} and f, the vacuum expectation value of the SM right-handed Higgs H_R. It is concluded that the muon g-2 anomaly can be explained in the region of 700 GeV le fle 1100 GeV, 13 GeV le m_{phi ^0}le 55 GeV, 100 GeV le m_{phi ^pm }le 900 GeV, m_{nu _R}ge 15 TeV, and 200 GeV le Mle 800 GeV, after imposing all the constraints mentioned above, where M here means the mass mixing coefficient M bar{q}_Lq_R, allowed by gauge invariance.

Single top partner production at lepton colliders in the left–right twin Higgs model

In the framework of the left–right twin Higgs (LRTH) model, we investigate the single top partner production at lepton colliders. We calculate the production cross-sections of the processes [Formula: see text], [Formula: see text] [Formula: see text] and [Formula: see text] [Formula: see text] at [Formula: see text] TeV, and display some typical differential distributions of the final state particles.

Higgs and Single Top Associated Production at the LHC in the Left-Right Twin Higgs Model**Supported by the National Natural Science Foundation of China under Grant No. U1404113, the Aid Project for the Mainstay Young Teachers in Henan Provincial Institutions of Higher Education of China under Grant Nos. 2016GGJS-135, 2014GGJS-283, and Colleges and Universities in Henan Province Key Scientific Research Project

In the framework of the left-right twin Higgs (LRTH) model, we study the Higgs boson and single top quark associated production at the LHC. We investigate the processes , and at the 8(14) TeV LHC and find that the production cross sections of the three processes can be enhanced at different levels. Among them, the production cross section of the process is enhanced significantly due to the contribution of the new particles predicted by the LRTH model.

The Lagrangians in Rξ gauge of the left–right twin Higgs model and the application to processes gg → h and h → γγ

The left–right twin Higgs (LRTH) model, which adds an extra set of the Higgs to the Standard Model (SM) Higgs spectrum by the left–right discrete symmetry, is one of the phenomenological realization of the new physics models to solve the little hierarchy problem. In this paper, we will, in the [Formula: see text] gauge, give the complete Lagrangians in this new physics model and then apply them to the processes [Formula: see text] and [Formula: see text].

Higgs boson production and decay at [formula omitted] colliders as a probe of the Left–Right twin Higgs model

In the framework of the Left–Right twin Higgs (LRTH) model, we consider the constrains from the latest search for high-mass dilepton resonances at the LHC and find that the heavy neutral boson ZH is excluded with mass below 2.76 TeV. Under these constrains, we study the Higgs–Gauge coupling production processes e+e−→ZH, e+e−→νeνe¯H and e+e−→e+e−H, top quark Yukawa coupling production process e+e−→tt¯H, Higgs self-couplings production processes e+e−→ZHH and e+e−→νeνe¯HH at e+e− colliders. Besides, we study the major decay modes of the Higgs boson, namely h→ff¯(f=b,c,τ), VV⁎(V=W,Z), gg, γγ. We find that the LRTH effects are sizable so that the Higgs boson processes at e+e− collider can be a sensitive probe for the LRTH model.

Constraining dark matter in the LRTH model with latest LHC, XENON100 and LUX data

In the left–right twin Higgs (LRTH) model, the neutral is a candidate for weakly interacting massive particle dark matter (DM). If its mass is lighter than half of the standard model-like Higgs boson h, the new invisible decay will become open. In this paper, we examine the status of a light DM () under current experimental constraints including the latest LHC Higgs data, the XENON100 and LUX limit on the DM scattering off the nucleon. The following observations have been obtained: (i) the current ATLAS (CMS) measurements of can exclude the invisible Higgs branching ratio larger than 34% (48%) at level; (ii) the Global fits to the latest LHC and Tevatron Higgs data provide a stronger constraint: (30%) at () level, which could be tested in the LHC experiments; (iii) for the spin-independent scattering cross section off the nucleon, the recent XENON100 (LUX) data can exclude the invisible decay rate larger than 50% (25%); and (iv) the results of direct DM searches with LUX can give strong constraint on the viable parameter space of in this LRTH model.

Production and decays of a light ϕ 0 in the LRTH model under the LHC Higgs data

In this paper we study the production and decays of a light pseudoscalar boson $\phi^0$ with $m_{\phi^0} \leq m_h/2$ appeared in the left-right twin Higgs (LRTH) model, and explore its phenomenological consequences when the latest LHC Higgs data are taken into account. We found that (a) the decay rate $Br(h\to \phi^0\phi^0)$ can be as large as $80\%$ and can suppress significantly the visible $\gamma\gamma$ signal rate, but the latest LHC Higgs data put a strong constraint on it: $Br(h \to \phi^0\phi^0) \leq 30\%$ at $3\sigma$ level; (b) the $p$-value of the LRTH model is around $0.6$, smaller than that of the SM in most of the parameter space and approaches the SM value $0.8$ for a sufficiently large $f$ parameter; (c) the neutral pseudoscalar $\phi^0$ dominantly decay into $b\bar{b}$ and the decay rate $Br(\phi^0\to b\bar{b})$ can be larger than $80\%$ for $m_{\phi^0}\leq 60$ GeV, and the second main decay mode is $\phi^0\to \tau^{+}\tau^{-}$ with a branching ratio about $14\%$; and (d) at the future $e^-e^+$ collider with $\sqrt{s}=250$ GeV, the processes $e^{+}e^{-}\to Zh\to Z(\phi^0\phi^0)\to Z(4b,2b2\tau)$ are promising for discovering such a light pseudoscalar $\phi^0$.

Associated production of the Z boson with a pair of top quarks in the left-right twin Higgs model

In the context of the left-right twin Higgs (LRTH) model, we first examine the effects on the production at the ILC and LHC. Our results show that the cross-sections can be significantly deviated from the standard model predictions and thus provide a good probe for the LRTH model. We also estimate the new production channel, or production, at the LHC. Compared with production, we find that the production can have a sizable production rate when the scale f is not too high. Considering the dominant decay mode , we find that final state has less background than production and may likely be observable at the LHC.

Left-right twin Higgs model confronted with the latest LHC Higgs data

Motivated by the latest LHC Higgs data, we calculate the new physics contributions to the Higgs decay channels of $h\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$, $Z\ensuremath{\gamma}$, $\ensuremath{\tau}\ensuremath{\tau}$, $W{W}^{*}$, and $Z{Z}^{*}$ in the left-right twin Higgs (LRTH) model, induced by the loops involving the heavy $T$ quark, the ${W}_{H}$ and ${\ensuremath{\phi}}^{\ifmmode\pm\else\textpm\fi{}}$ bosons that appeared in the LRTH model. We find that (a) for a standard-model-like Higgs boson around 125.5 GeV, the signal rates normalized to the corresponding standard model (SM) predictions are always suppressed when new physics contributions are taken into account and approach the SM predictions for a large scalar parameter $f$; and (b) the LRTH prediction for ${R}_{\ensuremath{\gamma}\ensuremath{\gamma}}$ agrees well with the CMS measurement ${R}_{\ensuremath{\gamma}\ensuremath{\gamma}}=0.77\ifmmode\pm\else\textpm\fi{}0.27$ at $1\ensuremath{\sigma}$ level but differs from the ATLAS result. The forthcoming precision measurement of the diphoton signal at the LHC can be a sensitive probe for the LRTH model.

Detection of Charged Higgs Bosons in e+e−(γγ) → tb̄φ− Production at the ILC

In the context of the left-right twin Higgs (LRTH) model, we have studied the charged Higgs bosons production processes e+e−(γγ) → tb̄φ− at the International Linear Collider (ILC). It is found that the cross sections of these two processes could reach a few fb with reasonable parameter values. With the yearly integrated luminosity of ℒ = 500fb−1 expected at the ILC, one could collect hundreds up to thousands of charged Higgs events via these two processes. Therefore, our researches in this paper can help us search for charged Higgs bosons, and furthermore, to test the LRTH model.

SINGLE PRODUCTION OF THE GAUGE BOSONS VIA eγ COLLISION AT THE HIGH ENERGY e+e- LINEAR COLLIDERS

The eγ collider is better suited to study single production of the gauge bosons. In this paper, we first consider the contributions of the three-site Higgsless (3SHL) model and the left–right twin Higgs (LRTH) model to the standard model (SM) processes eγ→eZ and eγ→νeW, and then study single production of the new neutral and charged gauge bosons predicted by these two models via eγ collision in the future high energy e+e- linear collider experiments. We find that the correction effects of 3SHL model on the processes eγ→eZ and eγ→νeW might be detected in the future, while this is not the case for the LRTH model. The process eγ→eZ' can give rise to different signatures in the 3SHL and LRTH models and thus can be used to distinguish these two kinds of new physics models at the high energy e+e- linear colliders.

Searches for new neutral gauge boson at the Tevatron and LHC in the left-right twin Higgs model

In the framework of the left-right twin Higgs (LRTH) model, we study the possibilities to detect the new Z′ boson at the Tevatron and LHC. First, using \(p\bar p\) collision data collected by the D0 and CDF II detectors, we find that the LRTH Z′ boson is excluded with masses below 940 GeV. Then we search for signatures of the Z′ boson at the LHC from the analysis of some distributions for \(p\bar p \to \mu ^ + \mu ^ - + X\), such as the number of events, the differential cross section of the dimuon invariant mass, the distributions of the transverse momentum and the forward-backward charge asymmetry. We do our calculation for two typical values of the LHC center of mass energy (7 and 14 TeV). The numerical results show that, by applying convenient cuts on some of the observables, the dimuon invariant mass and final particle pT distributions can reveal the presence of the heavy neutral gauge boson Z′ contribution in the LRTH model.

TRIPLE HIGGS BOSON PRODUCTION AT THE ILC IN THE LEFT–RIGHT TWIN HIGGS MODEL

Besides the SM-like Higgs boson h, the left–right twin Higgs (LRTH) model predicts the existence of three additional Higgs bosons: one neutral Higgs ϕ0and a pair of charged Higgs bosons ϕ±. In this paper, we focus on the study of the triple Higgs production at the ILC, i.e. e+e-→ϕ0ϕ+ϕ-and e+e-→hhϕ0. We present the production cross-sections and the distributions of the various observables, such as, the distributions of the energy and the transverse momenta of neutral and charged Higgs bosons, the differential cross-section of the invariant mass of final Higgs bosons pair, and the production angle distributions of neutral Higgs boson and charged Higgs boson. Our numerical results show that, for the processes e+e-→ϕ0ϕ+ϕ-and e+e-→hhϕ0, the production rates are at the level of 10-1fb with reasonable parameter values while the resonance production cross-section can be significantly enhanced and reach several tens fb. The signatures for signals and corresponding standard model backgrounds are also investigated for the decay mode [Formula: see text].

PRODUCTION OF $ht\bar{t}$ AND $ht\bar{T}$ IN THE LEFT–RIGHT TWIN HIGGS MODEL IN γγ COLLISIONS AT ILC

In the left–right twin Higgs (LRTH) model, we first examine the effects in [Formula: see text] production in γγ collision and find that, in the favorable parameter spaces, the absolute values of the relative correction can be significantly large. We also estimate the new production process [Formula: see text], our results show that its cross-section can reach the level of a few fb for M = 150 GeV . A simply phenomenological analysis is also given for the decay modes T→ϕ+b and T→W+b. As long as the new T-quark is not too heavy, we conclude that this new channel might be used to test the LRTH model in the future ILC experiment.

PRODUCTION OF CHARGED HIGGS BOSON ASSOCIATED WITH A W GAUGE BOSON AT THE LHC

Production of charged Higgs boson associated with a W gauge boson at the LHC is mainly induced by the tree-level [Formula: see text] annihilation and the one-loop gg fusion. In the context of the Higgs triplet model (HTM) and the left–right twin Higgs (LRTH) model, we calculate the production cross-section σ of the process pp→H±W∓ and compare our results with those given by supersymmetry (SUSY). We find that, in most of the parameter space of the HTM, the production cross-section σ is smaller than that predicted by the LRTH model or SUSY. The value of σ within the LRTH model is larger or smaller than the SUSY case, which depends on the relevant free parameters.

Associated ZH and WH Production in Left-Right Twin Higgs Model at LHC

At the CERN large hadron collider (LHC), production of the Higgs boson in association with Z or W bosons provides a dramatic experimental signal for detecting the standard model (SM) Higgs boson. In this paper, we consider the contributions of the left-right twin Higgs (LRTH) model to the processes qq̄′ → Z (W) H. Our numerical results show that, in the favorable parameter spaces, the cross sections deviate distinctly from the predictions of the SM. The possible signals of the LRTH model can be detected via these processes at the LHC experiments.

Pair production of neutral Higgs bosons from the left-right twin Higgs model via γγ collisions

The left-right twin Higgs (LRTH) model predicts the existence of the neutral Higgs bosons (h, φ0), which can be produced in pairs (φ0φ0, hh, φ0h) via γγ collisions at the next generation e+e− International Linear Collider (ILC). Our numerical results show that the production cross section of the neutral Higgs boson pair φ0φ0 can reach 8.8 fb. The subprocess γγ → φ0φ0 might be used to test the LRTH model in future ILC experiments.

Pseudoscalar boson and SM-like Higgs boson production at ILC in the left–right twin Higgs model

Besides the SM-like Higgs boson h, the left–right twin Higgs(LRTH) model predicts the existence of the neutral pseudoscalar boson ϕ0. In this Letter, we study the pair production of the pseudoscalar boson ϕ0 and SM-like Higgs bosons h at the International Linear Collider (ILC). We find that the production cross section of the process e+e−→hϕ0 are at the level of 10−1 fb with reasonable parameter values, However, the resonance production cross section can be significantly enhanced, which can reach several hundreds fb. In some favorable case (for example, small values of f and mϕ0), the SM backgrounds are nowhere an issue by applying suitable cut on the bb¯ invariant mass spectrum. The ILC provides an idea environment for discovering the pseudoscalar boson and measuring its properties.

Standard-model-like Higgs-pair production and decay in left–right twin Higgs model

In the framework of the left–right twin Higgs (LRTH) model, we study the production of a pair of SM-like Higgs bosons at the LHC (Higgs mass is typical in the range of 160–180 GeV). First, we examine the production rate and find that it can be significantly larger than the SM prediction. Then we investigate the decays of the Higgs-pair and find that in some parameter space the new decay mode hh→WWSˆSˆ (Sˆ is a candidate for WIMP dark matter) can be important, which can suppress sizably the conventional decay modes like hh→WWWW, hh→WWZZ and hh→WWbb¯. Finally, we study the promising channel gg→hh→WWWW and find that the rate can be sizably enhanced or suppressed compared with the SM prediction.

Production of Charged Higgs Bosons from Left-Right Twin Higgs Model at TeV Energy e−γ Colliders

The left-right twin Higgs (LRTH) model predicts the existence of three additional Higgs bosons: one neutral Higgs φ0 and a pair of charged Higgs bosons φ±. In this paper, we study two pair production processes of these new particles at the next generation eγ colliders, i.e., e−γ→ e−φ+φ−, and e−γ→ νRφ−φ0. We find that the production cross section of the process e−γ→ e−φ+φ− are at the level of several tens fb, the production cross section of the process e−γ→ νRφ−φ0 can reach 0.35 fb with the reasonable parameter values. As long as the charged Higgs bosons are not too heavy, we conclude that these processes might be used to test for the left-right twin Higgs model in future high-energy linear collider experiments.