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**Autoria(s):** 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.
Contribuinte(s)	UNIVERSIDADE DE SÃO PAULO
Data(s)	18/04/2012 18/04/2012 2011
Resumo	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 average of this fundamental quantity, and it is consistent with current theoretical predictions. National Science Foundation (NSF) [PHY-0079840] U.S. Department of Energy (DOE)[DE-AC05-84ER40150]
Identificador	PHYSICAL REVIEW LETTERS, v.106, n.16, 2011 0031-9007 http://producao.usp.br/handle/BDPI/16375 10.1103/PhysRevLett.106.162303 http://dx.doi.org/10.1103/PhysRevLett.106.162303
Idioma(s)	eng
Publicador	AMER PHYSICAL SOC
Relação	Physical Review Letters
Direitos	restrictedAccess Copyright AMER PHYSICAL SOC
Palavras-Chave	#NEUTRAL PION #LIFETIME #NUCLEI #Physics, Multidisciplinary
Tipo	article original article publishedVersion

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