Particle Zoo

The Standard Model

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Other Mesons

Symbols: J/ψ, B, Y, ρ, η, ...
Group: boson, hadron, meson
Rest mass: several u
Charge: -1, 0, +1
Mean lifetime: < 10-8 sec
Spin: 0 or 1
Other mesons occur in nearly every quark/antiquark combination, whereas such with a top quark cannot be found. The larger the used quarks are, the more unstable are the mesons by trend. Even combinations of the same quark/antiquark are possible, like the J/ψ made of charm and anticharm. This has a mass of 3.3 u and a lifetime of 10-20 seconds, charge and spin are 0. B mesons with bottom quarks have masses of over 5 u and lifetimes of 10-12 seconds and less.



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