Weak interactions produce the left-handed chiral part of massive particles. What proportion of left-handed and right-handed helicities does that correspond to?
Estimate the ratio of the cross sections [math]\displaystyle{ p\bar p\to H^0 }[/math] and [math]\displaystyle{ p\bar p\to W }[/math], for [math]\displaystyle{ \sqrt{s}\approx 500 }[/math] GeV.
Positively charged pions decay mostly into [math]\displaystyle{ \mu^+\nu_\mu }[/math] and not into [math]\displaystyle{ e^+ \nu_e }[/math]. Why?
Show that [math]\displaystyle{ \tilde\psi=i\sigma_2\psi^* }[/math] transforms as a right-handed spinor if [math]\displaystyle{ \psi }[/math] is left-handed.
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