PHYSICS · Subjective · Fermi University Physics · Particle Physics & Quantum Fields · Interacting fields, Feynman diagrams and QED · Electroweak theory and the Standard Model
Particle Physics, Ch Exchange, range and coupling: diagrams as bookkeeping
Problem
The charged kaon K+, of quark content usˉ, decays as K+→μ++νμ. (a) Describe the Feynman diagram for this decay at the quark level: the incoming quark lines, the internal line, and each vertex. (b) State which vertex type is used, how many times, and identify the quark-flavour change involved. (c) Check charge conservation at each vertex.