Consider the cross section of the process e e f f as a function of the centre of mass energy s near a resonance of mass M R and total width Assuming that the BreitWigner formula correctly describes its line shape, calculate its integral over energy (the peak area) Assume 2 M R

Question: Consider the cross-section of the process e + e f + f as a function of the centre of mass energy s

Consider the cross-section of the process e⁺e^– → f ⁺f ^– as a function of the centre of mass energy √s near a resonance of mass M_R and total width Γ. Assuming that the Breit–Wigner formula correctly describes its line shape, calculate its integral over energy (the ‘peak area’). Assume Γ / 2 << M_R.

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