Fig. 2.

Observed and expected 95 % CL upper limits on the cross section times branching fraction as a function of the resonance pole mass for the $G^{\ast }$ (top) and EGM $W^{\prime }$ (bottom). The LO (NNLO) theoretical cross section for the $G^{\ast }$ (EGM $W^{\prime }$) production is also shown. The inner and outer bands around the expected limits represent $\pm 1\mathit{\sigma }$ and $\pm 2\mathit{\sigma }$ variations respectively. The band around the $W^{\prime }$ cross section corresponds to the NNLO theory uncertainty