New Measurement of the pi(0) Radiative Decay Width
- LARIN, I.
- MCNULTY, D.
- CLINTON, E.
- AMBROZEWICZ, P.
- LAWRENCE, D.
- NAKAGAWA, I.
- PROK, Y.
- TEYMURAZYAN, A.
- AHMIDOUCH, A.
- ASRATYAN, A.
- BAKER, K.
- BENTON, L.
- BERNSTEIN, A. M.
- BURKERT, V.
- COLE, P.
- COLLINS, P.
- DALE, D.
- DANAGOULIAN, S.
- DAVIDENKO, G.
- DEMIRCHYAN, R.
- DEUR, A.
- DOLGOLENKO, A.
- DZYUBENKO, G.
- ENT, R.
- EVDOKIMOV, A.
- FENG, J.
- GABRIELYAN, M.
- GAN, L.
- GASPARIAN, A.
- GEVORKYAN, S.
- GLAMAZDIN, A.
- GORYACHEV, V.
- GYURJYAN, V.
- HARDY, K.
- HE, J.
- ITO, M.
- JIANG, L.
- KASHY, D.
- KHANDAKER, M.
- KINGSBERRY, P.
- KOLARKAR, A.
- KONCHATNYI, M.
- KORCHIN, A.
- KORSCH, W.
- KOWALSKI, S.
- KUBANTSEV, M.
- KUBAROVSKY, V.
- LI, X.
- MARTEL, P.
- MATVEEV, V.
- MECKING, B.
- MILBRATH, B.
- MINEHART, R.
- MISKIMEN, R.
- MOCHALOV, V.
- MTINGWA, S.
- OVERBY, S.
- PASYUK, E.
- PAYEN, M.
- PEDRONI, R.
- RITCHIE, B.
- RODRIGUES, T. E.
- SALGADO, C.
- SHAHINYAN, A.
- SITNIKOV, A.
- SOBER, D.
- STEPANYAN, S.
- STEPHENS, W.
- UNDERWOOD, J.
- VASILIEV, A.
- VISHNYAKOV, V.
- WOOD, M.
- ZHOU, S.
DOIAbstract
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) -> 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) -> 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) -> gamma gamma) = 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 ...
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