In the context of the littlest Higgs （LH） model, we estimate the production cross section of the process e^-у→ e^-H in the future high-energy linear e^＋e^- collider （ILC） with the center-of-mass （CM） energy ...In the context of the littlest Higgs （LH） model, we estimate the production cross section of the process e^-у→ e^-H in the future high-energy linear e^＋e^- collider （ILC） with the center-of-mass （CM） energy √S = 500 GeV. Our numerical results show that the contributions of the LH model Co this process are very small in most of the parameter space allowed by the electroweak precision measurement data, and are very diffcult to be detected in the future ILC experiments.展开更多
We propose,in this paper,to use several multivariate analysis methode and a new kind of variables to separate between four classes of events produced at LEP2:the events with 2 jets,3 jets,4 jets and those having a mor...We propose,in this paper,to use several multivariate analysis methode and a new kind of variables to separate between four classes of events produced at LEP2:the events with 2 jets,3 jets,4 jets and those having a more abundant jet topology(n jets,n>4) Neural network have proven themselves to be more efficient classifier than the other techniques.The efficiencies and purities achieved with the optimized neural network are in average 1 to 7% higher than those obtaind with the other methods.展开更多
We calculate the corrections of extended technicolor (ETC) interactions to the asymmetry parameter ALR and the polarized parameters pLt, PtR of the process e+ e-→tt in topcolor-assisted multiscale technicolor model. ...We calculate the corrections of extended technicolor (ETC) interactions to the asymmetry parameter ALR and the polarized parameters pLt, PtR of the process e+ e-→tt in topcolor-assisted multiscale technicolor model. Our results show that the ETC effect on PtR is negligibly small which can be safely ignored, and the ETC effect on ALR may be testable at high energy e+e- linear collider (LC). For 0.03 ≤ε≤ 0.1, 500 GeV ≤ s ≤ 800 GeV, the relative correction of PtL is in the range of 15% ≤δPtL/PtL,SM ≤ 39%, which will certainly be detected at the LC experiments (for example TESLA).展开更多
基金The project supported in part by the Program for New Century Excellent Talents in Universities NCET-04-0290 and National Natural Science Foundation of China under Grant No, 10475037
文摘In the context of the littlest Higgs （LH） model, we estimate the production cross section of the process e^-у→ e^-H in the future high-energy linear e^＋e^- collider （ILC） with the center-of-mass （CM） energy √S = 500 GeV. Our numerical results show that the contributions of the LH model Co this process are very small in most of the parameter space allowed by the electroweak precision measurement data, and are very diffcult to be detected in the future ILC experiments.
文摘We propose,in this paper,to use several multivariate analysis methode and a new kind of variables to separate between four classes of events produced at LEP2:the events with 2 jets,3 jets,4 jets and those having a more abundant jet topology(n jets,n>4) Neural network have proven themselves to be more efficient classifier than the other techniques.The efficiencies and purities achieved with the optimized neural network are in average 1 to 7% higher than those obtaind with the other methods.
文摘We calculate the corrections of extended technicolor (ETC) interactions to the asymmetry parameter ALR and the polarized parameters pLt, PtR of the process e+ e-→tt in topcolor-assisted multiscale technicolor model. Our results show that the ETC effect on PtR is negligibly small which can be safely ignored, and the ETC effect on ALR may be testable at high energy e+e- linear collider (LC). For 0.03 ≤ε≤ 0.1, 500 GeV ≤ s ≤ 800 GeV, the relative correction of PtL is in the range of 15% ≤δPtL/PtL,SM ≤ 39%, which will certainly be detected at the LC experiments (for example TESLA).
