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# Fano resonance

In physics, a Fano resonance, in contrast with a Breit–Wigner resonance, is a resonance for which the corresponding profile in the cross-section has the so-called Fano shape, i.e. it can be fitted with a function proportional to:

${(q \Gamma_\mathrm{res}/2 + E - E_\mathrm{res})^2 \over (E - E_\mathrm{res})^2 + (\Gamma_\mathrm{res}/2)^2 }.$

$1 \over (E - E_\mathrm{res})^2 + (\Gamma_\mathrm{res}/2)^2.$