  New strategy for resonance search in dijet events at the LHC is discussed.
The main distribution used for a bump search is the dijet invariant mass
distribution with appropriated cuts. The crucial cut, which is applied to
maximize signal significance, is on (pseudo)rapidity difference between the two
jets. This is due to the exponential growing of the QCD background contribution
with this variable. Usually it is assumed that signal from almost all exotic
models populates the central dijet rapidity region y_{1,2} ~ 0 and |y_1-y_2| ~
0. By contrast, the excited bosons do not contribute into this region, but
produce an excess of dijet events over the almost flat QCD background in chi =
exp|y_1-y_2| away from this region. Therefore, different sets of cuts should be
applied for new physics search depending on the searched resonance properties.
In order to confirm the bump and reveal the resonance nature various angular
distributions should be used in addition. In particular, for the excited bosons
the special choice of parameters could lead to a dip in the centrality ratio
distribution over the dijet invariant mass instead of a bump, expected in the
most exotic models.
