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rpp2010-rev-wz-quartic-couplings

rpp2010-rev-wz-quartic-couplings - 1 ANOMALOUS W/Z QUARTIC...

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– 1– ANOMALOUS W/Z QUARTIC COUPLINGS Revised March 2006 by C. Caso (University of Genova) and A. Gurtu (Tata Institute). The Standard Model predictions for WWWW , WWZZ , WWZγ , WWγγ , and ZZγγ couplings are small at LEP, but expected to become important at a TeV Linear Collider. Outside the Standard Model framework such possible couplings, a 0 , a c , a n , are expressed in terms of the following dimension-6 operators [1,2]; L 0 6 = e 2 16Λ 2 a 0 F μν F μν W α · W α L c 6 = e 2 16Λ 2 a c F μα F μβ W β · W α L n 6 = i e 2 16Λ 2 a n ijk W ( i ) μα W ( j ) ν W ( k ) α F μν L 0 6 = e 2 16Λ 2 a 0 F μν F μν W α · W α L n 6 = i e 2 16Λ 2 a n ijk W ( i ) μα W ( j ) ν W ( k ) α F μν where F, W are photon and W fields, L 0 6 and L c 6 conserve C , P separately ( L 0 6 conserves only C ) and generate anomalous W + W - γγ and ZZγγ couplings, L n 6 violates CP ( L n 6 violates both C and P ) and generates an anomalous W + W - cou- pling, and Λ is an energy scale for new physics. For the ZZγγ coupling the CP
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