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Top result for TevatronAn important missing piece of the Standard Model of particle physics has been discovered by researchers at Fermilab in the US, home to the world’s most powerful operational particle collider, the Tevatron. On Wednesday the CDF and D0 experiments independently reported unambiguous evidence that top quarks, the heaviest of the six known quark flavours, can be produced individually rather than in pairs as had been observed until now (arXiv 0903.0885v1 and arXiv 0903.0850v1 both submitted to Phys. Rev. Lett.).Because singly produced top quarks decay into final states that mimic the signature expected for the Standard Model Higgs boson — the biggest missing chunk of the 35-year-old theory — the results bode well for the Higgs search currently gathering pace at the Tevatron while CERN’s more powerful Large Hadron Collider (LHC) is being repaired. “We would not be able to claim evidence for a low-mass Higgs if we did not first observe single top quark production,” says D0 co-spokesperson Darien Wood...