News & AnalysisHigh-Energy Physics

A Sign of New Particles or General Restlessness?

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Science  15 Apr 2011:
Vol. 332, Issue 6027, pp. 296
DOI: 10.1126/science.332.6027.296

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Last week, news spread that scientists in the United States may have spotted a bit of matter unlike any seen before. But even as they contemplate the implications, physicists are taking the result with a grain of salt. The supposed signal could be an experimental artifact, caution the researchers who found it. And if a new particle is there, physicists may have to perform theoretical contortions to explain why they didn't spot it before.