Assertion: neutrino's lepton number | /r/HasProperty | conserved
Facets:
value: within the standard model
type: OTHER
value: always
type: DEGREE
value: within most extensions
type: LOCATION
value: in all observed processes
type: LOCATION
value: likewise
type: DEGREE
value: exactly
type: DEGREE
Source sentences:
text: Scientists consider the total lepton number to be conserved if the summed family lepton flavor numbers before a reaction remain unchanged after a reaction.
text: The lepton number is just a conserved quantity in all observed processes, with the almost certain exception of neutrino oscillations.
text: So β– (electron) decay produces antineutrinos (lepton number is conserved: 1 + (-1) = 0), and β+ (positron) decay produces neutrinos.
text: If the mixing (12) takes place, the total lepton number is conserved and the neutrinos with definite masses ( ) differ from the corresponding antineutrinos by the lepton number ( ).
text: This is the minimal 3-3-1 Pisano-Pleitez-Frampton model where total lepton number is conserved and neutrinos are massless particles.
text: A simple calculation shows that both and the lepton number are conserved by and also by the full Lagrangian, except for some of the following Yukawa interactions which induce masses for the fermions where the subscripts LNC and LNV indicate lepton number conserving and lepton number violating term, respectively.
text: In theory, it is impossible for Lepton number to be exactly conserved, because unlike electric charge, it does not come with an electric field associated to it.
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: Since weak hypercharge is always conserved this implies that baryon number minus lepton number is also always conserved, within the Standard Model and most extensions.