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R5

From IFPA wiki
  1. Weak interactions produce left-handed massive particles. How does their helicity evolve with time?
  2. Estimate the ratio of the cross sections [math]p\bar p\to H^0[/math] and [math] p\bar p\to W[/math], for [math]\sqrt{s}\approx 500[/math] GeV.
  3. Positively charged pions decay mostly into [math]\mu^+\nu_\mu[/math] and not into [math] e^+ \nu_e[/math]. Why?
  4. Show that [math]\tilde\psi=i\sigma_2\psi^*[/math] transforms as a right-handed spinor if [math]\psi[/math] is left-handed.

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