Search for vector-like T quark through th channel at eγ collider

Abstract In an extension of the Standard Model with vector-like top partner, we investigate the vector-like top quark partner T via the channel e − γ → b ν e T ¯ ( → t ¯ h ) at future linear collider. Due to the larger production rates than unpolarized beams, we calculate the production cross sections in polarized beams at s = 2 and 3 TeV. We make a fast detector simulation for signal and background events and take a set of appropriate kinematic variables to enhance the signal significance. 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 ∈ [ 1300 GeV , 1480 GeV ] ( [ 1300 GeV , 1900 GeV ] ) can be excluded at 2σ level with the integrated luminosity 600 fb − 1 ( 3000 fb − 1 ) at s = 2 TeV. When the center-mass energy s is upgraded to 3 TeV, the excluded region is expanded to g ⁎ ∈ [ 0.3 , 0.5 ] ( [ 0.14 , 0.5 ] ) and m T ∈ [ 1300 GeV , 1940 GeV ] ( [ 1300 GeV , 2000 GeV ] ) with the integrated luminosity 600 fb − 1 ( 3000 fb − 1 ). Besides, we find the 5σ discovery correlated region is g ⁎ ∈ [ 0.30 , 0.5 ] ( [ 0.27 , 0.5 ] ) and m T ∈ [ 1300 GeV , 1500 GeV ] ( [ 1300 GeV , 2000 GeV ] ) with the integrated luminosity 3000 fb − 1 at s = 2 TeV (3 TeV).