Abstract
The main distribution for a bump search is the dilepton-invariant-mass distribution with appropriate cut on an absolute value of pseudorapidity difference Δη ≡ |η1 − η2| between the two leptons. The back-ground from the Standard Model Drell-Yan process contributes mainly to the central pseudorapidity region Δη ≈ 0. By contrast, the excited bosons lead to a peak at Δη ≈ 1.76. We show that this property allows one to enhance the significance of their bump search by means of the 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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