TC2 Model, LHT Model Jointly Produced By The LHC TW Correction

Content:It is well-known that the Standard Model (SM) of particle physics can only be an effective field theory under some high energy scale, so many extensions to the SM of particle physics have been pro-posed. Such as LHT model, the left-right twin higgs (LRTH) model, the three-site higgsless model, etc. These new physics models predict some new particles beyond the SM, such as new charged gauge boson W’, etc. These new particles may be produced and detected by Large Hadron Collider (LHC). Thus, the search for new particles provides a theoretical evidence for the existence of new physics. Little higgs theory is one of the most popular new physics theory. The motivation of this theory is to solve hierarchy problem, however it still suffers from severe constraints from precision electroweak measurement. To avoild this problem, T parity is introduced, which constructs the LHT model. In addition to this, TC2model is also a prevailing model. It has predicted some new particles, such as Ï€t0,Ï€t±, ht bosons, etc. These new particles could make contributions to some physical processes. So if we can detect theses corrections, It is helpful for us to learn more about the TC2model and other new physics.As we know, top quark is the heavist fermion among elementary particles within the SM. Its mass is at weak scale. Moreover, top quark could almostly couples to all fermions. So top quark may serve as a window to probe new physics. The flavor changing neutral current (FCNC) are forbidden at the tree-level in the SM. Moreover, it is highly suppressed by the Glashow-Iliopoulos-Maiani(GIM) mechanism at the loop-level. While in new physics models, FC interaction may be large. Therefore, searching for single top quark flavor chaning (FC) interaction for its production and decay can serve as an effective way to hunt for new physics models.In this paper, we consider the correction effects of the FC interaction induced by top quark on the processes ppâ†'tW-+X and ppâ†'tW++X in the TC2model and the LHT model. Based on calculation, we find in most of the parameter space, the contributions of the anomalous top coupling induced by the LHT model to the tW production are larger than those for the TC2model. This is partly because the contributions of the LHT model from the anomalous top coupling tcg and tug, while only from the anomalous top coupling tug for the TC2model. Thus, the corrections effects of the anomalous top coupling tqg induced by the LHT model on the tW production cross section should be detected at the LHC. Although the value of the charge asymmetry parameter R induced by the LHT model is larger than that for the TC2model, its value is smaller than1.06in most of the LHT parameter space. So, observing the charge asymmetry of the tW production process at the LHC induced by the LHT model or the TC2model is much challenge.