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  2. Lepton number - Wikipedia

    en.wikipedia.org/wiki/Lepton_number

    Lepton number is an additive quantum number, ... the tau number, for the tauon and the tau neutrino. Prominent examples of lepton flavor conservation are the muon decays.

  3. Tau (particle) - Wikipedia

    en.wikipedia.org/wiki/Tau_(particle)

    The tau (τ), also called the tau lepton, tau particle or tauon, is an elementary particle similar to the electron, with negative electric charge and a spin of ⁠ 1 / 2 ⁠.Like the electron, the muon, and the three neutrinos, the tau is a lepton, and like all elementary particles with half-integer spin, the tau has a corresponding antiparticle of opposite charge but equal mass and spin.

  4. Lepton - Wikipedia

    en.wikipedia.org/wiki/Lepton

    The members of each generation's weak isospin doublet are assigned leptonic numbers that are conserved under the Standard Model. [36] Electrons and electron neutrinos have an electronic number of L e = 1, while muons and muon neutrinos have a muonic number of L μ = 1, while tau particles and tau neutrinos have a tauonic number of L τ = 1. The ...

  5. Flavour (particle physics) - Wikipedia

    en.wikipedia.org/wiki/Flavour_(particle_physics)

    Leptons may be assigned the six flavour quantum numbers: electron number, muon number, tau number, and corresponding numbers for the neutrinos (electron neutrino, muon neutrino and tau neutrino). These are conserved in strong and electromagnetic interactions, but violated by weak interactions.

  6. List of particles - Wikipedia

    en.wikipedia.org/wiki/List_of_particles

    2.3.1 Leptonic atoms. 2.4 Molecules. 2.5 Ions. ... Tau τ −), Tau neutrino ... as well as any composite particles consisting of an odd number of these, ...

  7. Geometry index - Wikipedia

    en.wikipedia.org/wiki/Geometry_index

    In coordination chemistry and crystallography, the geometry index or structural parameter (τ) is a number ranging from 0 to 1 that indicates what the geometry of the coordination center is. The first such parameter for 5-coordinate compounds was developed in 1984. [ 1 ]

  8. Kaon - Wikipedia

    en.wikipedia.org/wiki/Kaon

    This led to the so-called 'tau–theta' problem: [13] what seemed to be the same particle (now called K +) decayed in two different modes, Theta to two pions (parity +1), Tau to three pions (parity −1). [12] The solution to this puzzle turned out to be that weak interactions do not conserve parity. [7]

  9. Neutrino oscillation - Wikipedia

    en.wikipedia.org/wiki/Neutrino_oscillation

    Neutrino oscillation is a quantum mechanical phenomenon in which a neutrino created with a specific lepton family number ("lepton flavor": electron, muon, or tau) can later be measured to have a different lepton family number.