What is the definitive treatment for Wolff-Parkinson-White (wpw) syndrome?

Ablation. Ablation of the aberrant fiber, typically using catheters through the groin (rather than open heart surgery), will typically 'cure' the condition and is successful in 90-95% of cases.
Various treatments. Wpw syndrome is a fairly common finding and if there are no symptoms and no evidence for secondary related rhythm problems, it doesn't necessarily need treatment. When dangerous rhythms are seen or seen to be at risk then ablation of the bypass tract(s) causing the problem by an electrophysiologist is generally the treatment of choice.