light particles existing with hadros including electrons, neutrinos and photons
'Light' particles that do not interact via the strong nuclear force. They come in six types (flavours): the electron and its heavier charged cousins, the muon and tau, together with their three neutrinos.
Leptons is the collective term used to describe those fermions which do not experience the strong nuclear force. They are all subject to the weak interactions and those with electric charges experience electromagnetic forces.
Fundamental particles that are relatively non-reactive and capable of an independent existence: electrons, muons, tau particles and neutrinos.
a family of particles that have spin a very small number and that experience no strong forces.
elementary particles that interact by the weak nuclear force (see table 32.1)
Elementary particles that do not participate in strong nuclear reactions, e.g., electrons, neutrinos, and photons.