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problem44_21

University Physics with Modern Physics with MasteringPhysics™ (12th Edition)

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44.21: Conservation of lepton number. a) 1 1 0 : , 1 1 : + + - + + + - - e u e L L v v e μ μ so lepton numbers are not conserved. b) 1 1 0 : - + = + + - - e τ e L v v e τ 1 1 : + = + τ L so lepton numbers are conserved. c) . γ + + + e π Lepton numbers are not conserved since just one lepton is
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