Nonstandard Quartic Self Interactions of Electroweak Vector Bosons   within a Gauge Invariant Higher-Derivative Term
  A locally SU(2)xU(1)-invariant term of dimension six with effective interactions of the electroweak gauge and Higgs fields is examined. This term also contains higher derivatives of the fields. It yields nonstandard quartic gauge-boson self-interactions but neither nonstandard cubic self-interactions nor tree-level effects on presently measurable quantities. 
Carsten Grosse-Knetter (Universitaet Bielefeld)