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Gamma/Z interference in e+e- -> mu+ mu-

  • Calculate analytically the cross section for $e^+ e^- \to \mu^+ \mu^-$ as function of the CMS energy, including both exchange of a photon and a Z boson. Neglect masses of the external fermions. Compare your result with MadGraph.
  • The Forward-Backward asymmetry is $A_{FB}(\theta)=\frac{ d\sigma (\theta) - d\sigma(\pi-\theta)}{ d\sigma (\theta) + d\sigma(\pi-\theta)}$. Plot it as a function of the CMS energy.

-- Main.FabioMaltoni - 30 Aug 2007

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