Which of the following elementary particle is a lepton?

The muon decays according to ${\mu }^{-}\to e^{-}+\overline{{\nu }_e}+{\nu }_{\mu }$. A Feynman diagram for this decay is shown below.

Use the above diagram to construct a new Feynman diagram representing the scattering of electron anti-neutrino off a muon.

Explain, in terms of quarks, the difference between a baryon and a meson.

Determine whether the following reaction conserve or violates strangeness. (use ${\mathrm{\pi }}^{\circ } \mathrm{d}\overline{\mathrm{d}}, {\mathrm{K}}^{+}=\mathrm{u}\overline{\mathrm{s}}, {\mathrm{\Lambda }}^{\circ }=\mathrm{uds},{\mathrm{K}}^{\circ }=\mathrm{d}\overline{\mathrm{s}}, {\mathrm{\Sigma }}^{-}=\mathrm{dds}$)

${\mathrm{\pi }}^{-}+{\mathrm{p}}^{+}\to {\mathrm{K}}^0+{\mathrm{\Lambda }}^0$

The muon decays according to ${\mu }^{-}\to e^{-}+\overline{{\nu }_e}+{\nu }_{\mu }$. A Feynman diagram for this decay is shown below.

Identify the three unlabelled particles in the diagram.

Determine whether the following reaction conserve or violates strangeness. (use ${\mathrm{\pi }}^{\circ } \mathrm{d}\overline{\mathrm{d}}, {\mathrm{K}}^{+}=\mathrm{u}\overline{\mathrm{s}}, {\mathrm{\Lambda }}^{\circ }=\mathrm{uds},{\mathrm{K}}^{\circ }=\mathrm{d}\overline{\mathrm{s}}, {\mathrm{\Sigma }}^{-}=\mathrm{dds}$)

$K^0\to {\mathrm{\pi }}^{-}+{\mathrm{\pi }}^{+}$

In a copy of the table shown below, write 'yes' to identify the interaction(s) that apply to hadrons and to leptons.

Determine whether the following reaction conserve or violates strangeness. (use ${\mathrm{\pi }}^{\circ } \mathrm{d}\overline{\mathrm{d}}, {\mathrm{K}}^{+}=\mathrm{u}\overline{\mathrm{s}}, {\mathrm{\Lambda }}^{\circ }=\mathrm{uds},{\mathrm{K}}^{\circ }=\mathrm{d}\overline{\mathrm{s}}, {\mathrm{\Sigma }}^{-}=\mathrm{dds}$)

$p^0+n\to K^{+}+{\Sigma }^{-}$

The interaction responsible for the decay of the muon has a very short range. State the property of the exchange particle that is responsible for the short range.

Write down the reaction equation representing the decay ${\mu }^{+}$, which is anti-particle of the ${\mu }^{-}$.

What process does this Feynman diagram represent?

Copy and complete the Feynman diagram to represent the beta minus decay of neutron, making sure that you label all particles involved.

Determine whether the following reaction conserve or violate baryon number.

${\Lambda }^{\circ }\to {\mathrm{\pi }}^{+}+{\mathrm{\pi }}^{-}$