Determine whether the following proposed decay for the charged pion π−\pi^-π− is possible:
π−→μ−+νˉe \pi^- \to \mu^- + \bar{\nu}_e π−→μ−+νˉeState the quark configurations of the charged kaon K+\text{K}^+K+ and its antiparticle, the charged kaon K−\text{K}^-K−.
A student suggests that because the neutral pion π0\pi^0π0 is its own antiparticle, both the charged pion π+\pi^+π+ and the charged kaon K+\text{K}^+K+ must also be their own antiparticles.
Discuss whether this suggestion is correct, referencing their quark configurations, charges, or other physical properties.
50 exam-style questions on AQA A Level Physics Particles, covering Constituents of the atom, Stable and unstable nuclei, Particles, antiparticles and photons, Particle interactions, Classification of particles, Quarks and antiquarks, and Applications of conservation laws. Each one has a worked solution and a mark scheme showing where the marks go.