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2010

A New Measurement of the $\pi^0$ Radiative Decay Width

Larin, I., McNulty, D., Clinton, E. et al.

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High precision measurements of the differential cross sections for $\pi^0$ photoproduction at forward angles for two nuclei, $^{12}$C and $^{208}$Pb, have been performed for incident photon energies of 4.9 - 5.5 GeV to extract the ${\pi^0 \to \gamma\gamma}$ decay width.

The experiment was done at Jefferson Lab using the Hall B photon tagger and a high-resolution multichannel calorimeter.
The ${\pi^0 \to \gamma\gamma}$ decay width was extracted by fitting the measured cross sections using recently updated theoretical models for the process.
The resulting value for the decay width is $\Gamma{(\pi^0 \to \gamma\gamma)} = 7.82 \pm 0.14 ~({\rm stat.}) \pm 0.17 ~({\rm syst.}) ~{\rm eV}$.

A New Measurement of the $\pi^0$ Radiative Decay Width · Around

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