New Measurement of the π0 Radiative Decay Width

I. Larin et al. (PrimEx Collaboration)
Phys. Rev. Lett. 106, 162303 – Published 20 April 2011

Abstract

High precision measurements of the differential cross sections for π0 photoproduction at forward angles for two nuclei, C12 and Pb208, have been performed for incident photon energies of 4.9–5.5 GeV to extract the π0γγ decay width. The experiment was done at Jefferson Lab using the Hall B photon tagger and a high-resolution multichannel calorimeter. The π0γγ 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 Γ(π0γγ)=7.82±0.14(stat)±0.17(syst)eV. With the 2.8% total uncertainty, this result is a factor of 2.5 more precise than the current Particle Data Group average of this fundamental quantity, and it is consistent with current theoretical predictions.

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  • Received 12 September 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.162303

© 2011 American Physical Society

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Vol. 106, Iss. 16 — 22 April 2011

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