Yue Chong-Xing

Associated production of the top-pions and single top at hadron colliders

In the context of topcolor-assisted technicolor (TC2) models, we study the production of the top-pions {pi}{sub t}{sup 0,{+-}} with single top quark via the processes pp{yields}t{pi}{sub t}{sup 0}+X and pp{yields}t{pi}{sub t}{sup {+-}}+X, and discuss the possibility of detecting these new particles at Tevatron and LHC. We find that it is very difficult to observe the signals of these particles via these processes at Tevatron, while the neutral and charged top-pions {pi}{sub t}{sup 0} and {pi}{sub t}{sup {+-}} can be detecting via considering the same sign top pair ttc event and the ttb (or ttb) event at LHC, respectively.

Heavy charged leptons from type-III seesaw and pair production of the Higgs boson H at the International Linear e+ e- Collider

Type-III seesaw scenario predicts the existence of the heavy charged leptons, which might generate observable signals in future collider experiments. We consider the contributions of these new particles to the process e+e− → HH. We find that, for the large mixing between the light and heavy leptons, these new particles can indeed generate significant contributions to this process.

Single Production of Doubly Charged Higgs Boson via eγ Collision in Higgs Triplet Model

The Higgs triplet model (HTM) predicts the existence of a pair of doubly charged Higgs bosons H±±. Single production of H±± via eγ collision at the next generation e+e− International Linear Collider (ILC) and the Large Hadron electron Collider (LHeC) is considered. The numerical results show that the production cross sections are very sensitive to the neutrino oscillation parameters. Their values for the inverted hierarchy mass spectrum are larger than those for the normal hierarchy mass spectrum at these two kinds of collider experiments. With reasonable values of the relevant free parameters, the possible signals of the doubly charged Higgs bosons predicted by the HTM might be detected in future ILC experiments.

Top Quark Chromomagnetic Dipole Moment in the Littlest Higgs Model with T-Parity

The littlest Higgs model with T-parity, which is called LHT model, predicts the existence of the new particles, such as heavy top quarks, heavy gauge bosons, and mirror fermions. We calculate the one-loop contributions of these new particles to the top quark chromomagnetic dipole moment (CMDM) ΔK. We find that the contribution of the LHT model is one order of magnitude smaller than the standard model prediction value.

Single Production of Charged Top-Pions at High Energy Linear e+e- Colliders*

The dominant decay modes of charged top-pions are or . We consider the single production of charged top-pions in association with a top quark via e+e- annihilation and calculate the production cross section of the processes at the leading order. We find that it can reach 1.2 fb with reasonable parameter values. The charged top-pions may be detected via the channel in the future high energy e+e- colliders.

Production of Charged Higgs Boson Associated with Top Partner at the Large Hadron Collider

In the context of the littlest Higgs (LH) model and the left-right twin Higgs (LRTH) model, we study the production of charged Higgs boson associated with top partner at the LHC. We find that, in the LH model, its cross section can be significantly larger for the scale parameter f = 500 GeV, while sharply decreases as f increases. In the LRTH model, this production process mainly transfers to the ttbbb final state at the Large Hadron Collider and its production rate can reach 167.2 fb.

Littlest Higgs Model and Higgs Boson Associated Production with Top Quark Pair at High Energy Linear e^＋e^- Collider

In the parameter space allowed by the electroweak precision measurement data, we consider the contributions of the new particles predicted by the littlest Higgs(LH) model to the Higgs boson associated production with top quark pair in the future high energy linear ee collider(ILC). We find that the contributions mainly come from the new gauge bosons ZH and BH . For reasonable values of the free parameters, the absolute value of the relative correction parameter δσ/σ can be significanly large, which might be observed in the future ILC experiment with √ S = 800GeV . PACS number:12.60.Cn, 14.80.Cp, 14.65.Ha ∗E-mail:cxyue@lnnu.edu.cnIn the parameter space allowed by the electroweak precision measurement data, we consider the contributions of the new particles predicted by the littlest Higgs model to the Higgs boson associated production with top quark pair in the future high energy linear e+e− collider (ILC). We find that the contributions mainly come from the new gauge bosons ZH and BH. For reasonable values of the free parameters, the absolute value of the relative correction parameter δσ/σSM can be significanly large, which might be observed in the future ILC experiment with (S)1/2 = 800 GeV.

Top-Higgs

In the context of topcolor-assisted technicolor (TC2) models, we calculate the s-channel contributions of the top-Higgs to the process . We find that, for reasonable ranges of the parameters, can give significant contributions to this process. When the top-Higgs mass approximately equals to the center-of-mass energy and the free parameter , the cross section can reach 161 fb, which may be detected in the ?? collisions based on the future e+e? colliders. Thus, the process may be used to probe the top-Higgs and further test TC2 models in ?? collisions.

h_t^0

We investigate the radiative dileptonic decays Bs → l+l−γ (l = e, μ and τ) in the framework of the topcolor-assisted technicolor (TC2) model. The contributions of the new particles predicted by this model to the branching ratios and the forward-backward asymmetry (AFB) of these decays are considered. It is found that the values of their branching ratios are greater than the standard model (SM) predictions by several times up to one order of magnitude and |AFB| can also be enhanced by several times in a wide range of the parameter space.

and the Process

In the context of the topcolor-assisted technicolor (TC2) model, we consider the production of the neutral scalar S(π0t or h0t) associated with a photon at the LHC and compare our results with those given by the minimal supersymmetric extension of the Standard Model (MSSM). We find that its production cross section is larger or smaller than that of the scalar particle predicted by the MSSM model, depending on the values of the relevant free parameters.