Dijet resonance from leptophobic Z′ and light baryonic cold dark matter

In light of the recent CDF report on the excess in the Wjj channel, we analyze (non)supersymmetric U(1)B×U(1)L model, interpreting the dijet peak as a leptophobic U(1)B gauge boson. If this excess is confirmed, it has an interesting implication for the baryonic cold dark matter (CDM) in the model: there should be light CDM with a few GeV mass, and direct detection cross section at the level of a few×10−2 pb.