High-energy physics. A sign of new particles or general restlessness?

@article{Cho2011HighenergyPA,
  title={High-energy physics. A sign of new particles or general restlessness?},
  author={Adrian Cho},
  journal={Science},
  year={2011},
  volume={332 6027},
  pages={
          296
        }
}
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 didn9t spot it before. 

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