The meson has a measured total decay width and a branching ratio .

PHYSICS · Multi-part · Fermi University Physics · Particle Physics & Quantum Fields · Particles, interactions and experiment · Particles, interactions and experiment

Particle Physics, Ch Decay rates, cross sections and phase space

Problem

The η\eta meson has a measured total decay width Γ=1.31 keV\Gamma = 1.31\,\mathrm{keV} and a branching ratio B(η→γγ)=39.4%\mathcal{B}(\eta \to \gamma\gamma) = 39.4\%. ((a)) Find the mean lifetime of the η\eta. ((b)) Find the partial width Γγγ\Gamma_{\gamma\gamma} for the decay η→γγ\eta \to \gamma\gamma, in keV\mathrm{keV}.

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