A once-promising hint of new physics from the Large Hadron Collider has melted away, quashing one of physicists’ best hopes for a major discovery
LHCb first reported a tenuous discrepancy in the production of muons and electrons in 2014. When collisions of protons produced massive particles called B mesons, these quickly decayed. The most frequent decay pattern produced another type of meson, called a kaon, plus pairs of particles and their antiparticles — either an electron and a positron or a muon and an antimuon.
The latest results included more data than the previous LHCb measurements of the B meson decays, and also a more thorough study of possible confounding factors. The apparent discrepancies in the earlier measurements involving kaons were in part the result of misidentifying some other particles as electrons, says LHCb spokesperson Chris Parkes, a physicist at the University of Manchester, UK. While LHC experiments are good at catching muons, electrons are trickier for them to detect.
Although it had been rumoured for months, the latest result comes as a surprise, says Gino Isidori, a theoretical physicist at the University of Zurich who was at the CERN talk, because a coherent picture seemed to be emerging from related anomalies. This could have pointed to the existence of previously unseen elementary particles that could be affecting the decays of B mesons.
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