Production and Decay of Intermediate Vector Mesons

The decay of the intermediate vector meson of the weak interactions W is discussed with emphasis on the modes W→2π, W→K+π. It is noted that if the W mass is in the neighborhood of the observed π-π resonance at ~30m_π², then the mode W→2π will dominate all others. The production of W's by π's and K's is also discussed in terms of a "peripheral collision" model.