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rpp2010-rev-triple-gauge-couplings

rpp2010-rev-triple-gauge-couplings - 1 EXTRACTION OF TRIPLE...

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– 1– EXTRACTION OF TRIPLE GAUGE COUPLINGS (TGC’S) Revised March 2009 by M.W. Gr¨unewald (U. College Dublin and U. Ghent) and A. Gurtu (Tata Inst.). Fourteen independent couplings, 7 each for ZWW and γWW , completely describe the V WW vertices within the most general framework of the electroweak Standard Model (SM) consistent with Lorentz invariance and U(1) gauge in- variance. Of each of the 7 TGC’s, 3 conserve C and P in- dividually, 3 violate CP , and one TGC violates C and P individually while conserving CP . Assumption of C and P con- servation and electromagnetic gauge invariance reduces the independent V WW couplings to five: one common set [1,2] is ( κ γ , κ Z , λ γ , λ Z , g Z 1 ), where κ γ = κ Z = g Z 1 = 1 and λ γ = λ Z = 0 in the Standard Model at the tree level. The parameters κ Z and λ Z are related to the other three due to constraints of gauge invariance as follows: κ Z = g Z 1 - ( κ γ - 1) tan 2 θ W and λ Z = λ γ , where θ W is the weak mixing angle. The W magnetic dipole moment, μ W , and the W
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