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29 March 2024
 
  » arxiv » 1208.2902

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Constraints on FCNC $Htq$ couplings from the signal of $tH$ associated production with QCD NLO accuracy at the LHC
Yan Wang ; Fa Peng Huang ; Chong Sheng Li ; Bo Hua Li ; Ding Yu Shao ; Jian Wang ;
Date 14 Aug 2012
AbstractWe study a generic Higgs boson and a top quark associated production via model-independent flavor-changing neutral-current (FCNC) couplings at the LHC, including complete QCD next-to-leading order (NLO) corrections to the production and decay of the top quark and the Higgs boson. We find that QCD NLO corrections can increase the total production cross sections by about 48.9% and 57.9% for the $Htu$ and $Htc$ coupling induced processes at the LHC, respectively. After kinematic cuts are imposed on the decay products of the top quark and the Higgs boson, the QCD NLO corrections are reduced to 11% for the $Htu$ coupling induced process and almost vanish for the $Htc$ coupling induced process. Moreover, QCD NLO corrections reduce the dependence of the total cross sections on the renormalization and factorization scales. We also discuss signals of the $tH$ associated production with the decay mode $t ightarrow bl^{+}E slash_{T}, H ightarrow bar{b}$ and $tar{t}$ production with the decay mode $ar{t} ightarrow Har{q}, t ightarrow bl^{+}E slash_{T}$. Our results show that, in some parameter regions, the LHC may observe the above signals at the $5sigma$ level. Otherwise, the upper limits on the FCNC $Htq$ couplings can be set.
Source arXiv, 1208.2902
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