By Adrian Cho
For decades, particle physicists have yearned for physics beyond their tried-and-true standard model. Now, they are finding signs of something unexpected at the Large Hadron Collider (LHC), the world’s biggest atom smasher at CERN, the European particle physics laboratory near Geneva, Switzerland. The hints come not from the LHC’s two large detectors, which have yielded no new particles since they bagged the last missing piece of the standard model, the Higgs boson, in 2012, but from a smaller detector, called LHCb, that precisely measures the decays of familiar particles.
The latest signal involves deviations in the decays of particles called B mesons—weak evidence on its own. But together with other hints, it could point to new particles lying on the high-energy horizon. “This has never happened before, to observe a set of coherent deviations that could be explained in a very economical way with one single new physics contribution,” says Joaquim Matias, a theorist at the Autonomous University of Barcelona in Spain. Matias says the evidence is strong enough for a discovery claim, but others urge caution.
The LHC smashes protons together at unprecedented energy to try to blast into existence massive new particles, which its two big detectors, ATLAS and CMS, would spot. LHCb focuses on familiar particles, in particular B mesons, using an exquisitely sensitive tracking detector to sniff out the tiny explosive decays.
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