Light dark matter in leptophobic Z′ models

Recent experimental results in direct dark matter detection may be interpreted in terms of a dark matter particle of mass around 10 GeV/c(2). We show that the required scenario can be realized with a new dark matter particle charged under an extra Abelian gauge boson Z' that couples to quarks but not leptons. This is possible provided the Z' gauge boson is very light, around 10-20 GeV/c(2) in mass, and the gauge coupling constant is small, alpha' similar to 10(-5). Such scenarios are not constrained by accelerator data.