Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-08-11
Eur.Phys.J.C46:93-105,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages, 1 figure, 7 tables, comments, references and a table added; to appear in EPJC
Scientific paper
10.1140/epjc/s2006-02474-1
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.
Nachtmann Otto
Nagel Felix
Pospischil Martin
Utermann Andre
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