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New Measurement of theπ0Radiative Decay Width

Physical Review Letters2011Vol. 106(16), pp. 162303–162303

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I. Larin, D. McNulty, E. Clinton, P. Ambrozewicz, David Lawrence, I. Nakagawa, Y. Prok, A. Teymurazyan, A. Ahmidouch, A.E. Asratyan, Keith Baker, L. Benton, A. M. Bernstein, V. D. Burkert, P. L. Cole, P. Collins, D. Dale, S. Danagoulian, G.V. Davidenko, R. Demirchyan, A. Deur, A. Dolgolenko, G.B. Dzyubenko, R. Ent, A. Evdokimov, J. Feng, M. Gabrielyan, L. Gan, A. Gasparian, S. R. Gevorkyan, A. Glamazdin, V. Goryachev, V. Gyurjyan, K.A. Hardy, Jun He, M. M. Ito, Lijun Jiang, D. Kashy, M. Khandaker, P. Kingsberry, A. Kolarkar, M. Konchatnyi, Alexander Korchin, W. Korsch, S. Kowalski, M. Kubantsev, V. Kubarovsky, X. Li, P. P. Martel, V. Matveev, B. A. Mecking, B. D. Milbrath, R. Minehart, R. Miskimen, В. В. Мочалов, S. Mtingwa, S. Overby, E. Pasyuk, M. Payen, R. Pedroni, B. G. Ritchie, T. E. Rodrigues, C. Salgado, A. Shahinyan, A. L. Sitnikov, D. I. Sober, S. Stepanyan, W. Stephens, Jonathan G. Underwood, A. L. Vasiliev, V.E. Vishnyakov, M. H. Wood, Shiming Zhou

Abstract

High precision measurements of the differential cross sections for π0 photoproduction at forward angles for two nuclei, 12C and 208Pb, have been performed for incident photon energies of 4.9-5.5 GeV to extract the π0→γγ decay width. The experiment was done at Jefferson Lab using the Hall B photon tagger and a high-resolution multichannel calorimeter. The π0→γγ 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(π0→γγ)=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.

Citations Over TimeTop 10% of 2011 papers

Abstract

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