Search For Vector-like T Quark Single Production At Eγ Collider

The success of particle physics standard model（SM）is that it predicts many particles successfully and these particles have been proved in the following experiments.The Large Hardon Collider（LHC）which belongs to European Organization for Nuclear Research（CERN）,has found Higgs,the last particle predicted by SM in 2012.The mass of other particles can be given by coupling with Higgs,which is considered as the source of mass and called”God particle".The appearance of Higgs has also brought the natural problem of SM,theoretical physicists are looking for a proper method to solve this problem.Some new physical model,like super symmetry model（SUSY）,can solve this problem incidentally during the process of therical physics researchers looking for.SUSY solves natural problem by using the correction from super particles loop or the contribution from scalar partner T loop.There are also some models appear which specially provide a possible way to solve natural problem such as the little higgs model.Compared with SUSY,those models have only top quark which has partner and this partner is vector-like.For the independent of results of collider simulation and the ceference value of models,a simplified model with only one vector-like top quark partner has been used.The spectrum of partcles and the Lagrangian in SM of particle physics will be introduced first,the following is the introduction of basic information about colliders and at then the simulation of detection of T at eγ collider under this simplified model and last,disposing and analyses of signal simulated will be carried out.The signal process we studied is:The characteristics of signal have been analysed first,main SM backgrounds of this signal processes have been listed and the cross section of both signal and backgrounds with the varying center of mass（?）have been given.Figures which describe various physical quantities belong to both signal and backgrounds in the center of mass（?）=2TeV and 3TeV the have been drawn according to the data.Various kinematic variables including the transverse momentum,the distance of angle,rapidity,the transverse mass and etc can be selected to distinguish signal from backgrounds by the characteristic of these figures.According the features of these chosen kinematic variables,a serious of selection conditions（called cut）have been set to improve the significance of signal.The excluded and discovery possibility under different mass of T with the varying integrated luminosities C and coupling coefficient g^*in polarized initial electron beams have been researched.The detective ability of vector-like top quark partner in this and other recent research works have been compared as the conclusion.After the comparison,when the initial state radiation and beamstrahlung effects are in charge,we find that the correlated region g^*∈[0.33,0.5]（[0.14,0.5]）and m_T ∈[1300GeV,1480GeV]（[1300GeV,1900GeV]）can be excluded at 2σ level with the integrated luminosity 600 fb^-1(3000 fb^-1)at（?）=2 TeV.When the centermass energy（?）is upgraded to 3 TeV,the excluded region is expanded to g^*∈[0.3,0.5]（[0.14,0.5]）and m_T ∈[1300GeV,1940GeV]（[1300GeV,2000GeV]）with the integrated luminosity 600 fb^-1(3000 fb^-1).Besides,we find the 5a discovery correlated region is g^*∈[0.30,0.5]（[0.27,0.5]）and m_T∈[1300GeV,1500GeV]（[1300GeV,2000GeV]）with the integrated luminosity 3000 fb^-1 at（?）=2 TeV（3 TeV）.