A Three Dimensional Model For Direct Laser Metal Powder by Labudovic, Kovalevic

By Labudovic, Kovalevic

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Cal e V 3S GAUGE THEORIES whereby e' is eliminated. By definition ve is the neutrino which is the partner of the electron, etc. For quarks we cannot do so because the d and s quarks are distinguishable (they have different "masses"). In conclusion in the standard model, with four quarks and four leptons, the GIM mechanism is natural; the lepton numbers Le and L~ are also automatically conserved provided the neutrinos are massless. Since 1975 the third family of leptons and quarks have entered into the arena.

UL = -uL (A uL ' ))+{ . 1L = -uL { ... }uL' etc. 1 However, In . . llngs to W± , "'m m( "3 ) ,m = 1 , 2 , 3) the A's show up, that is, there we find all kinds of Cabibbo angles. More explicitly, the charged currents from ~R(T • V)~R are of the form ,c ,c eR v R -, From ~L(T W~ . V)~L -' v L e' W L ,c , -' ~ vR y , -' c dR e X R (15-2) , we get the charged currents of the form -' u L d' W , u,c d' Y , ---;c 1li, u'L L L L X , -' uL ,c eL Y , -' dL ,c eL X In (15-2) and (15-3) we have left out the y-matrices, colour indices, etc.

M. BOhm and H. Joos, DESY Report 78/27 Tin German); this article includes an abundant list of references. H. Harari, Phys. Reports 42C: 235 (1978). J. Iliopoulos, CERN Yellow Report 77-18, pp. 36-78. C. Taylor, Gauge theories of weak interactions, Cambridge University Press (1976). The SU(5) model and its consequences may be found in, for example, 6. 7. 8. 9. 10. H. L. Glashow, Phys. Rev. Lett. 32, 438 (1974). H. Georgi, H. Quinn and S. Weinberg, Phys. Rev. Lett. 33, 451 '(1974). A. Buras, J. Ellis, M.

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