【摘 要】
：
Top partners are well motivated in many new physics models.Usually,vector like quarks,TL,R,are in-troduced to circumvent the quantum anomaly.Therefore,it is crucial to probe their interactions with standard model particles.However,flavor changing neutral
【机 构】
：
Center for Future High Energy Physics and Theoretical Physics Division,Institute of High Energy Phys
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Top partners are well motivated in many new physics models.Usually,vector like quarks,TL,R,are in-troduced to circumvent the quantum anomaly.Therefore,it is crucial to probe their interactions with standard model particles.However,flavor changing neutral couplings are always difficult to detect directly in current and future ex-periments.In this paper,we demonstrate how to constrain the flavor changing neutral Yukawa coupling Tth indir-ectly,via the di-Higgs production.We consider the simplified model,including a pair of gauge singlet TL,R.Under the perturbative unitarity and experimental constraints,we select mT=400 GeV,sL =0.2,and mT =800 GeV,sL =0.1 as benchmark points.After the analysis on the amplitude and evaluation of the numerical cross sections,we infer that the present constraints from di-Higgs production have already surpassed the unitarity bound because of the (ytTL,R)4 behavior.For the case of mT =400 GeV and SL =0.2,ReytTL,R and ImytTL,R can be bounded optimally in the range (-0.4,0.4) at the HL-LHC with 2σ CL.For the case of mT =800 GeV and sL =0.1,ReytT,LR and ImytTL,R can be bounded optimally in the range (-0.5,0.5) at the HL-LHC with 2σ CL.The anomalous triple Higgs coupling δhhh can also affect the constraints on ytTL,R.Finally,we determine that the top quark electric dipole moment can provide stronger ytTL,R bounds in the off-axis regions for some scenarios.
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