Assertion: lepton's neutrino | /r/HasProperty | massless
Facets:
value: according to the standard model
type: OTHER
Source sentences:
text: according to the standard model, neutrinos should be massless.
text: The neutrinos are explicitly assumed to be massless.
text: Although neutrinos were long believed to be massless, it is now known that there are three discrete neutrino masses with different tiny values, but they do not correspond uniquely to the three flavors.
text: Although neutrinos were long believed to be massless, it is now known that there are three discrete neutrino masses; each neutrino flavor state is a linear combination of the three discrete mass eigenstates.