Tevatron's mystery signal grows stronger with more data

If physicists weren't jumping up and down with excitement in April at the announcement that an unknown particle had been glimpsed at Fermilab, they are now.The news of a possible particle sighting in the debris of proton-antiproton collisions at the Illinois accelerator had been met with a mix of curiosity and scepticism. It was based on an analysis of eight years of data collected by Fermilab's CDF experiment that looked at collisions that produced a W boson, carrier of the weak nuclear force, along with two jets of quarks.

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