1 - Parity Violation in Beta Decays The Parity operator is...

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P461 - decays II 1 Parity Violation in Beta Decays The Parity operator is the mirror image and is NOT conserved in Weak decays (is conserved in EM and strong) non-conservation is on the lepton side, not the nuclear wave function side spin 1/2 electrons and neutrinos are (nominally) either right-handed (spin and momentum in same direction) or left-handed (opposite) Parity changes LH to RH ) , , ( ) , , ( ) , , ( ) , , ( p f q p f q + - - - - r r P z y x z y x P RH LH L p r L P p p P r r r r r r = × = - = ) ( ) (
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P461 - decays II 2 “Handedness” of Neutrinos “handedness” is call chirality. If the mass of a neutrino = 0 then: all neutrinos are left-handed all antineutrinos are right-handed Parity is maximally violated As the mass of an electron is > 0 can have both LH and RH. But RH is suppressed for large energy (as electron speed approaches c) fraction RH vs LH can be determined by solving the Dirac equation which naturally incorporates spin
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1 - Parity Violation in Beta Decays The Parity operator is...

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