Z ′ boson signal at Fermilab-Tevatron and CERN-LHC in a 331 model

Abstract

We analyse the possibilities to detect a new Z ′ boson in di-electron events at Tevatron and LHC in the framework of the 331 model with right-handed neutrinos. We also study other fermions and Higgs events as final state at LHC. Using $p\bar{p}$ collision data collected by the CDF II detector at Fermilab Tevatron, we find that the 331 Z ′ boson is excluded with masses below 920 GeV. For an integrated luminosity of 100 fb−1 at LHC, and considering a central value $M_{Z^{\prime}}=1500$ GeV, we obtain the invariant-mass distribution in the process pp→Z ′→e + e −, where a huge peak, corresponding to 800 signal events/(20 GeV), is found above the SM background. The number of di-electron events vary from 50000 to 2400 in the mass range of $M_{Z^{\prime}}=800$ –2000 GeV. We also obtain branching ratios and cross sections in other fermion and Higgs channels at LHC, where a heavy top quark T exhibits the biggest ratio with m T =300 GeV.