Assertion: lepton's neutrino | /r/HasProperty | light
Facets:
value: very
type: DEGREE
value: compared to the corresponding charged leptons
type: OTHER
Source sentences:
text: The currently most favoured extension is the so-called seesaw mechanism, which would explain both why the left-handed neutrinos are so light compared to the corresponding charged leptons, and why we have not yet seen any right-handed neutrinos.
text: From particle experiments, it is known that neutrinos are very light.