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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.

When T2K runs with antineutrino beams, such interactions produce either an antimuon or a positron, whose signals parallel those generated by the muons and electrons.

The team clocked an extremely rare process in which a BS meson — composed of a strange quark and a bottom antiquark — decays into a muon–antimuon pair.