| Literature DB >> 21599360 |
I Larin1, D McNulty, E Clinton, P Ambrozewicz, D Lawrence, I Nakagawa, Y Prok, A Teymurazyan, A Ahmidouch, A Asratyan, K Baker, L Benton, A M Bernstein, V Burkert, P Cole, P Collins, D Dale, S Danagoulian, G Davidenko, R Demirchyan, A Deur, A Dolgolenko, G Dzyubenko, R Ent, A Evdokimov, J Feng, M Gabrielyan, L Gan, A Gasparian, S Gevorkyan, A Glamazdin, V Goryachev, V Gyurjyan, K Hardy, J He, M Ito, L Jiang, D Kashy, M Khandaker, P Kingsberry, A Kolarkar, M Konchatnyi, A Korchin, W Korsch, S Kowalski, M Kubantsev, V Kubarovsky, X Li, P Martel, V Matveev, B Mecking, B Milbrath, R Minehart, R Miskimen, V Mochalov, S Mtingwa, S Overby, E Pasyuk, M Payen, R Pedroni, B Ritchie, T E Rodrigues, C Salgado, A Shahinyan, A Sitnikov, D Sober, S Stepanyan, W Stephens, J Underwood, A Vasiliev, V Vishnyakov, M Wood, S 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.Year: 2011 PMID： 21599360 DOI： 10.1103/PhysRevLett.106.162303
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161