Isospin symmetry breaking in ρ→πγ decay |
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| Authors: | X.-J. Wang J.-H. Jiang M.-L. Yan |
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| Affiliation: | (1) Institution of Theoretical Physics, Beijing, 100080, PRC, CN;(2) Center for Fundamental Physics, University of Science and Technology of China Hefei, Anhui 230026, PRC, CN;(3) CCAST(World Lab), P.O. Box 8730, Beijing, 100080, PRC, CN |
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| Abstract: | In terms of effective field theory and mixed-propagator approach, we show that there is a larger hidden effect of isospin breaking in ρ→πγ decay due to a ω exchange, ρ→ω→πγ. The branching ratio is predicted as B(ρ→πγ) = (11.67±2.0)×10-4, which is much larger than Particle Data Group's datum (6.8±1.7)×10-4 and one of charged mode, B(ρ±→π±γ) = (4.5±0.5)×10-4. Received: 7 January 2002 / Accepted: 2 April 2002 |
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| Keywords: | PACS. 14.40.Cs Other mesons with S = C = 0, mass < 2.5 GeV – 13.25.Jx Decays of other mesons – 12.40.Vv Vector-meson dominance – 13.40.Hq Electromagnetic decays |
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