摘要
The latest CDF anomaly, the excess of dijet events in the invariant-mass window 120-160Â GeV in associated production with a W boson, can be explained by a baryonic Z ′ model in which the Z ′ boson has negligible couplings to leptons. Although this Z ′ model is hardly subject to the Drell-Yan constraint from Tevatron, it is constrained by the dijet data from UA2 (√s=630GeV), and the precision measurements at LEP through the mixing with the SM Z boson. We show that under these constraints this model can still explain the excess in the M jj ∼120-160GeV window, as well as the claimed cross section σ(WZ ′ )∼4pb. Implications at the Tevatron would be the associated production of γZ ′ , ZZ ′ , and Z ′ Z ′ with the Z ′ →jj. We show that with tightened jet cuts and improved systematic uncertainties both γZ ′ →γjj and ZZ ′ → +- jj channels could be useful to probe this model at the Tevatron. © 2011 American Physical Society.