Assertion: positron's lepton number | /r/HasProperty | conserved
Facets:
value: always
type: DEGREE
value: likewise
type: DEGREE
Source sentences:
text: Likewise, when a W− boson decays into an electron and an antineutrino, lepton number is conserved because the W− boson is a non-lepton, the electron is a lepton, and the antineutrino is an antilepton.
text: So β– (electron) decay produces antineutrinos (lepton number is conserved: 1 + (-1) = 0), and β+ (positron) decay produces neutrinos.
text: Because lepton number has to be conserved.
text: A lepton number is assigned to every lepton (+1) and antilepton (-1), on the basis that the total lepton number for each branch of the lepton family is always conserved.
text: And coming out of the vertex we have a photon with a lepton number of zero, so lepton number is conserved.
text: At the down up W minus vertex, we can easily see that lepton number is conserved since there are no leptons associated with this vertex.
text: One minus one is exactly zero, so lepton number is indeed conserved.