A scalar boson is a boson whose spin equals zero.[1] Boson means that the particle's wavefunction is symmetric under particle exchange and therefore follows Bose–Einstein statistics. The spin-statistics theorem implies that all bosons have an integer-valued spin;[2] the scalar fixes this value to zero.
The name scalar boson arises from quantum field theory, which demands that fields of spin-zero particles transform like a scalar under Lorentz transformation (i.e. are Lorentz invariant).
A pseudoscalar boson is a scalar boson that has odd parity, whereas "regular" scalar bosons have even parity.[3]
https://en.wikipedia.org/wiki/Scalar_boson
| Fermion categories | Elementary particle generation | |||
|---|---|---|---|---|
| Type | Subtype | First | Second | Third |
| Quarks (colored) | down-type | down | strange | bottom |
| up-type | up | charm | top | |
| Leptons (color-free) | charged | electron | muon | tauon |
| neutral | electron neutrino | muon neutrino | tau neutrino | |
https://en.wikipedia.org/wiki/Lepton
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