Regular Article - Theoretical Physics
Z ′ boson signal at Fermilab-Tevatron and CERN-LHC in a 331 model
Departamento de Física, Universidad Nacional, Bogotá, Colombia
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Revised: 26 January 2009
Published online: 19 March 2009
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 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 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 –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.
© Springer-Verlag, 2009