https://doi.org/10.1140/epjc/s10052-013-2589-1
Regular Article - Theoretical Physics
Effective field theory analysis of new physics in e + e −→W + W − at a linear collider
1
Fakultät für Physik, Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, 80333, Munich, Germany
2
DESY, Notkestraße 85, 22607, Hamburg, Germany
* e-mail: gerhard.buchalla@lmu.de
Received:
27
March
2013
Revised:
22
July
2013
Published online:
11
October
2013
We analyze new-physics contributions to e
+
e
−→W
+
W
− at the TeV energy scale, employing an effective field theory framework. A complete basis of next-to-leading-order operators in the standard-model effective Lagrangian is used, both for the nonlinear and the linear realization of the electroweak sector. The elimination of redundant operators via equations-of-motion constraints is discussed in detail. Polarized cross sections for e
+
e
−→W
+
W
− (on-shell) are computed and the corrections to the standard-model results are given in an expansion for large 
. The dominant relative corrections grow with s and can be fully expressed in terms of modified gauge-fermion couplings. These corrections are interpreted in the context of the Goldstone-boson equivalence theorem. Explicit new-physics models are considered to illustrate the generation and the potential size of the coefficients in the effective Lagrangian. Brief comments are made on the production of W
+
W
− pairs at the LHC.
© Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica, 2013
