【摘 要】
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In the context of the left-right twin Higgs model,we study single production of a T-quark at the Large Hadron electron Collider based ep and γp colliders,which
【机 构】
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Department of Life Science and Technology, Xinxiang Medical University, Xinxiang 453003“,”Henan Inst
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In the context of the left-right twin Higgs model,we study single production of a T-quark at the Large Hadron electron Collider based ep and γp colliders,which proceed via the processes e+ b → (V)T and γb → W-T.For the main decay mode T → φ+ b → t(b)b,these two processes mainly transfer to the final states of 3b+ l (e or μ) + missing ET and 3b + 2l + missing ET,respectively.With the electron energy Ee =500 GeV and photon energy Ep =7 TeV,we find that the production rates can reach tensfb when the heavy T-quark mass mrT ＜ 600GeV.A simple phenomenological analysis is also given for the decay mode T → W+b.Our numerical results show that the SM background can be reduced by applying a cut on the transverse momentum of the final b-quark and the invariant mass of Wb.However,such a channel is only useful for a tiny parameter space.The twin Higgs mechanism[1,2] was proposed recently as an intresting solution to the little hierarchy problem,which can be implemented in left-right models with left-right symmetry.[2] A new heavy T-quark is one of the most crucial ingredients of the left-right twin Higgs (LRTH) model.The collider detector at Fermilib (CDF) has researched the strong pair production of the new heavy T-quark with its associated anti-quark,with 2.8fb-1 of data Run Ⅱ of Tevatron setting a lower bound on mass of heavy T-quark,mT ＞ 311 GeV at 95％ confidence level.[3]
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