Recent research at the BABAR experiment at SLAC has shown that the decay ratio of the B meson to a D meson, neutrino, and this particle is larger than expected from the Standard Model.
Recent research at the BABAR experiment at SLAC has shown that the decay ratio of the B meson to a D meson, neutrino, and this particle is larger than expected from the Standard Model. The discovery of this particle temporarily upset the symmetry of the Glashow-Iliopoulos-Maiani mechanism, according to which the existence of this particle implied the existence of the bottom and top quarks. This particle is the most massive non-hadronic product of the decay of the Z0 boson, and it is the only particle of its type that can itself decay into hadronic products. Like leptons in the first two generations, this third-generation lepton, discovered by Martin Perl, has a negative charge, and a mass of 1.7 GeV. For 10 points, identify this particle, the last heavy lepton to be discovered after the electron and the mauon.
Recent research at the BABAR experiment at SLAC has shown that the decay ratio of the B meson to a D meson, neutrino, and this particle is larger than expected from the Standard Model.
tau lepton [or tauon]