PROBING NEW GAUGE BOSON Z′ FROM THE LEFT–RIGHT TWIN HIGGS MODEL AT HIGH-ENERGY e+e- COLLIDERS

Abstract

The left–right twin Higgs (LRTH) model predicts the existence of the new neutral gauge boson Z′. In this paper, we calculate the contributions of this new particle to the processes e+e-→l+l-, [Formula: see text] and [Formula: see text] and study the possibility of detecting this new particle via these processes in the future high-energy linear e+e- collider (LC) experiments with [Formula: see text] and £ int = 340 fb-1, both for unpolarized and polarized beams. We find that the new gauge boson Z′ is most sensitive to the process [Formula: see text] with suitably polarized beams. As long as MZ′ ≤ 1.9 TeV , the absolute value of the relative correction parameter is larger than 5%. We calculate the forward–backward asymmetries for the process [Formula: see text], the results show that the possible signals of Z′ might be detected via measuring the deviations of A FB from its SM prediction for [Formula: see text]. Bounds on Z′ masses are also estimated within 95% confidence level. From our analysis, we conclude that the new gauge boson is most sensitive to the process [Formula: see text] and its virtual effects are most easy to be observed via this process in the future LC experiments.