Electroweak Chiral Lagrangians and $\gamma\gamma\to Z_L Z_L,\, W_L^+ W_L^$ at One Loop
Abstract
In these proceedings we discuss our recent work on $\gamma\gamma\to W^+_L W^_L$ and $\gamma\gamma\to Z_L Z_L$ within the framework of Electroweak Chiral Lagrangians with a light Higgs. These observables are good candidates to provide indications of physics beyond the Standard Model and can complement other analyses and global fits. Making use of the equivalence theorem, we have performed the computation up to the nexttoleading order in the chiral expansion, i.e., including oneloop corrections and the full set of possible counterterms allowed at that order in the lowenergy effective field theory. The oneloop amplitudes turn out to have a extremely simple structure and they are ultraviolet finite. Thus, the relevant combinations of higher order chiral couplings $c_\gamma^r$ and $(a_1^ra_2^r+a_3^r)$ do not run. We also identify an additional set of observables that depend on these same parameters, which can be use to complement the $\gamma\gamma$ analysis through a global fit.
 Publication:

arXiv eprints
 Pub Date:
 September 2014
 arXiv:
 arXiv:1409.3983
 Bibcode:
 2014arXiv1409.3983D
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 6 pages. Proceedings of the Second Annual Conference on Large Hadron Collider Physics  LCHP 2014, Columbia University, New York, U.S.A (June 27, 2014)