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Unformatted text preview: – 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 W W W W , W W ZZ , W W Zγ , W W γγ , 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 , a c , a n , are expressed in terms of the following dimension-6 operators [1,2]; L 6 = − e 2 16Λ 2 a 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 e L 6 = − e 2 16Λ 2 e a F μν e F μν W α · W α e L n 6 = − i e 2 16Λ 2 e a n ijk W ( i ) μα W ( j ) ν W ( k ) α e F μν where F, W are photon and W fields, L 6 and L c 6 conserve C , P separately ( e L 6 conserves only C ) and generate anomalous W + W- γγ and ZZγγ couplings, L n 6 violates CP ( e L n 6 violates both C and P ) and generates an anomalous W...
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This note was uploaded on 06/07/2011 for the course PHYS 4132 taught by Professor Kutter during the Spring '11 term at University of Florida.
- Spring '11