Multi-muon events at the Tevatron: a hidden sector from hadronic collisions

We show an explicit attempt to interpret the multi-muon anomaly recently claimed by the CDF Collaboration in terms of a light scalar singlet phi which communicates with the standard quarks either through a heavy scalar or a heavy fermion exchange. Building on arXiv:0810.5730, that suggested a singlet phi with a chain decay into a final state made of four tau(tau) over bar pairs, we can simulate most of the muon properties of the selected sample of events. Some of these properties adhere rather well to the already published data; others should allow a decisive test of the proposed interpretation. Assuming that the test is positively passed, we show how the PAMELA excess can be fitted by the annihilation of a TeV dark matter particle that communicates with the Standard Model via the new light singlet(s).