Single Production of Charged Gauge Boson W_H^-from Left-Right Twin Higgs Model in Association with Top Quark at LHC

The twin Higgs mechanism has recently been proposed to solve the little hierarchy problem. In the context of the left-right twin Higgs （LRTH） model, we discuss single production of the new charged gauge boson WH^- , which is predicted by the left-right twin Higgs model, in association with top quark at the CERN Large Hadron Collider （LHC）. It is found that, for a typical nonzero value of mass mixing parameter M = 150 GeV in the LRTH model, the production cross section is in the range of 3 ×10^-2 - 6.07×10^3 fb at the LHC. As long as the WH^- is not too heavy, the possible signatures of the heavy charged gauge boson might be detected at the LHC experiments.

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 φo 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→vRφ-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→vRφ-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.

Single Production of Top Quark via e^-γ Collision in Left-Right Twin Higgs Model

In the context of the left-right twin Higgs （LRTH） model, we fist study single production of the standard model （SM） top quark via e-γ collisions. We find that the corrections of the LRTH model to the cross section of the process e-γ→vebt might be observed only for f ≤750 GeV and the heavy top quark mass scale M ≥500 GeV in future high energy linear e^＋e^- collider （LC） experiment with the center-of-mass （CM） energy √s = 500 GeV and a yearly integrated luminosity of ￡ = 100 fb^-1. We also consider single production of the heavy top quark T via e-γ collisions. Our numerical results show that the possible signals of the heavy top quark T might be observed via the decay channel T →Ф^＋b→tbb in future LC experiment with √s = 3 TeV and ￡ = 500 fb^-1.

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 qq＇ --~ 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.

Higgs and Single Top Associated Production at the LHC in the Left-Right Twin Higgs Model

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 pp → thj, pp → thˉb and pp → th W at the 8(14) Te V 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 pp → thˉb is enhanced significantly due to the contribution of the new particles predicted by the LRTH model.

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＋eInternational 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.

Pair production of right-handed neutrinos in the left-right twin Higgs model at ILC and LHC

In the framework of the left-right twin Higgs model, we study pair production of the right-handed neutrinos at the International Linear Collider (ILC) and the CERN Large Hadron Collider (LHC). Our numerical results show that the production cross section of the process e+e→N N is at the level of several tens fb at the ILC. However, the resonance production cross section can be significantly enhanced to the order of pb. The pair production cross section for the right-handed neutrinos is the level of several hundreds of fb at the LHC. In general, pair production of right-handed neutrinos gives rise to 2l+4j signal without missing energy. As long as the right-handed neutrinos are not too heavy, we conclude that its pair production might be used to test for the left-right twin Higgs model at the future ILC and LHC experiments.

Single vector-like top partner production in the left-right twin Higgs model at TeV energy eγ colliders

The left-right twin Higgs model contains a new vector-like heavy top quark, which mixes with the SM- like top quark. In this work, we studied the single vector-like top partner production via process e-γ→ve Tb at the International Linear Collider. We calculated the production cross section at tree level and displayed the relevant differential distributions. The result shows that there will be 125 events produced each year with s=2 TeV and the integrated luminosity Lint ≈500 fb-1, and the b-quark tagging and the relevant missing energy ET cut will be helpful to detect this new effect.

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 pp collision data collected by the DO 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 pp --＊ It＋g- ＋ 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.

左右双Higgs模型中新的重顶夸克在LHeC上的产生

在左右双Higgs模型(LRTH)中,研究了单个顶夸克在大型强子-电子对撞机上通过e+b→veT和γb→W-T过程的产生.对于顶夸克主要的衰变模式T→+b→tbb,这两个过程会分别产生3b+l+ET和3b+2l+ET的末态信号.当电子能量Ee=500GeV,质子能量取Ep=7TeV时,发现产生截面在顶夸克质量小于600GeV时会达到几十fb.也对T→W+b的衰变模式进行了唯像分析.

在R_ξ规范下左右双Higgs模型的费曼规则

在利用左右双Higgs(left-right twin Higgs,LRTH)模型幺正规范下的费曼规则进行唯象计算时,往往会遇到圈图函数中的发散无法使用圈图工具进行计算和圈图无法处理的问题.为了解决这一难题,在R_ξ(ξ取任意值)规范下推导出LRTH模型的费曼规则,给出任意规范下包含规范固定项、费米子项、Higgs粒子项、鬼粒子项以及规范场传播子等在内的拉格朗日密度函数.

Top rare decays t→cV in mirror twin Higgs models

The decay t→cV(V=γ,Z,g)processes in mirror twin Higgs models with colorless top partners are studied in this paper.We report that the branchi ng ratios of these decays can strongly affect the standard model expectations in some parameter spaces and may be detectable according to the current precision electroweak measurements.Thus,constraints on the model parameters may be obtained from the branching fraction of the decay processes,which may serve as a robust detection tool for this new physics model.

Left-Right Non-Linear Dynamical Higgs

All the possible CP-conserving non-linear operators up to the p^4-order in the Lagrangian expansion are analysed here for the left-right symmetric model in the non-linear electroweak chiral context coupled to a light dynamical Higgs. The low energy effects will be triggered by an emerging new physics field content in the nature, more specifically,from spin-1 resonances sourced by the straightforward extension of the SM local gauge symmetry to the larger local group SU(2)_L × SU(2)_R× U(1)_(B-L). Low energy phenomenology will be altered by integrating out the resonances from the physical spectrum, being manifested through induced corrections onto the left handed operators. Such modifications are weighted by powers of the scales ratio implied by the symmetries of the model and will determine the size of the effective operator basis to be used. The recently observed diboson excess around the invariant mass 1.8 TeV–2 TeV entails a scale suppression that suggests to encode the low energy effects via a much smaller set of effective operators.

LHC上LRTH模型中Ztt和ZTt产生过程的研究

首先计算了左右双Higgs(LRTH)模型中大型强子对撞机上Ztt的产生截面及其相对修正,结果发现在LRTH模型所允许的参数空间内,Ztt的产生截面有较大的相对修正.然后,又计算了LRTH模型中新的产生道ZTt,发现当破缺标度不是很高时该过程有较大的产生截面.通过对以上两个过程的研究,可为检验LRTH模型提供很好的理论依据.

Detection of Charged Higgs Bosons in e^+e^-(γγ)→tφ^- Production at the ILC

Abstract In the context of the left-right twin Higgs （LRTH） model, we have studied the charged Higgs bosons production processes e＋e-（γγ） →tbФ- at the International Linear Collider （ILC）. It is found that the cross sections of these two processes could reach a few Fo with reasonable parameter values. With the yearly integrated luminosity of L 500 fb-1 expected at the ILC, one could collect hundreds up to thousands of charged ttiggs 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 gauge boson Z' at TeV Energy e^-γ colliders

In the context of the SU(3) simple group model and the Left-Right twin Higgs(LRTH) model,we study the single production of the new gauge boson Z' via e-γ collision and discuss the possibility to detect this new particle in the TeV energy e+e-collider(LC).The results show that the production cross section of the new heavy gauge boson Z' is in the range of 10.08fb～84.5fb,and the cross section in the LRTH model is bigger than that in the SU(3) simple group model.The sufficient typical events could be assumed in future high energy LC experiments.

LRTH模型中WbT在直线对撞机上的联合产生

在左右双希格斯(LRTH)模型中研究了单顶夸克伴子T与Wb在直线对撞机上的联合产生。计算了过程e^-e^+→W^-bT(W^+bT)和γγ→W^-bT(W^+bT)在质心能量S^(1/2)=2.0 TeV时的产生截面,发现这两个过程的产生截面分别可以达到O'(10~3)fb和O'(10)fb。另外还展示了产生过程中末态粒子典型的运动学分布。