The topcolor-assisted technicolor model (TC2) predicts a non-universal Z' gauge boson,which couples to the third generation fermions with enhanced strength.We study the effects of this non-universal gauge boson on...The topcolor-assisted technicolor model (TC2) predicts a non-universal Z' gauge boson,which couples to the third generation fermions with enhanced strength.We study the effects of this non-universal gauge boson on the cross section and spin correlation of top quark pair production through the process 99 →t at the LHC.We find that the total cross section and the spin correlation can be reduced by-4.7% and-1.4% respectively in the allowed parameter space.展开更多
In the simplest little Higgs model (SLH),we study the spin correlations in the top quark pair production at the LHC and ILC.We find that the SLH always suppresses the t spin correlations compared to the SM values.At t...In the simplest little Higgs model (SLH),we study the spin correlations in the top quark pair production at the LHC and ILC.We find that the SLH always suppresses the t spin correlations compared to the SM values.At the LHC,the suppression can be over 10% for mZ′< 750 GeV.The SLH prediction value is outside the 1σ range of the experimental data from ATLAS,and within 1σ range of the experimental data from CMS.At the ILC,the SLH can sizably suppress the t spin correlation for mZ′approaching the center-of-mass energy √s.For example,the maximal suppression can reach-22.5%,-14.5%,and-9.5% for √s=500 GeV,800 GeV,and 1000 GeV,respectively.Therefore,the t spin correlation at the ILC can be a sensitive probe for the SLH.展开更多
文摘The topcolor-assisted technicolor model (TC2) predicts a non-universal Z' gauge boson,which couples to the third generation fermions with enhanced strength.We study the effects of this non-universal gauge boson on the cross section and spin correlation of top quark pair production through the process 99 →t at the LHC.We find that the total cross section and the spin correlation can be reduced by-4.7% and-1.4% respectively in the allowed parameter space.
基金Supported by the National Natural Science Foundation of China under Grant Nos.11005089 and 11105116
文摘In the simplest little Higgs model (SLH),we study the spin correlations in the top quark pair production at the LHC and ILC.We find that the SLH always suppresses the t spin correlations compared to the SM values.At the LHC,the suppression can be over 10% for mZ′< 750 GeV.The SLH prediction value is outside the 1σ range of the experimental data from ATLAS,and within 1σ range of the experimental data from CMS.At the ILC,the SLH can sizably suppress the t spin correlation for mZ′approaching the center-of-mass energy √s.For example,the maximal suppression can reach-22.5%,-14.5%,and-9.5% for √s=500 GeV,800 GeV,and 1000 GeV,respectively.Therefore,the t spin correlation at the ILC can be a sensitive probe for the SLH.
