  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.
