# How many sigma did the discovery of the W boson have?

When the W boson was discovered in the 1980s, nobody spoke of sigmas. How many sigmas was it at that time?

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Standard deviations of significance (i.e. "sigmas") were part of the process and the literature long before 1980. I wasn't around then, but @anna might be able to say a few words about when the consensus that five sigma were needed to claim discovery came to be. –  dmckee Jul 2 '12 at 15:59