Abstract
The main distribution for a bump search is the dilepton invariant mass distribution with appropriated cut on an absolute value of pseudorapidity difference Delta_eta = |eta_1 - eta_2| between the two leptons. The background from the Standard Model Drell-Yan process contributes mainly to the central pseudorapidity region Delta_eta = 0. By contrast, the excited bosons lead to a peak at Delta_eta = 1.76. We show that this property allows to enhance the significance of their bump search by means of new cut optimization. Nevertheless, in order to confirm an observation of the bump and reveal the resonance nature other angular distributions should be used in addition.
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