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Effective-Lagrangian approach to gamma gamma --> WW; II: Results and comparison with e+e- --> WW

O. Nachtmann·F. Nagel·M. Pospischil·A. Utermann
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Abstract

We present a study of anomalous electroweak gauge-boson couplings which can be measured in e+e- and gamma gamma collisions at a future linear collider like ILC. We consider the gauge-boson sector of a locally SU(2) x U(1) invariant effective Lagrangian with ten dimension-six operators added to the Lagrangian of the Standard Model. These operators induce anomalous three- and four-gauge-boson couplings and an anomalous gamma gamma H coupling. We calculate the reachable sensitivity for the measurement of the anomalous couplings in gamma gamma --> WW. We compare these results with the reachable precision in the reaction e+e- --> WW on the one hand and with the bounds that one can get from high-precision observables in Z decays on the other hand. We show that one needs both the e+e- and the gamma gamma modes at an ILC to constrain the largest possible number of anomalous couplings and that the Giga-Z mode offers the best sensitivity for certain anomalous couplings.

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O. Nachtmann, F. Nagel, M. Pospischil, A. Utermann. 2006-04-21. Effective-Lagrangian approach to gamma gamma --> WW; II: Results and comparison with e+e- --> WW. https://doi.org/10.1140/epjc%2Fs2006-02474-1

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