EPJ

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EPJ A - Hadrons and Nuclei
Hadrons and Nuclei


Eur. Phys. J. A 14, 219-224 (2002)
DOI: 10.1140/epja/i2002-10003-3

Isospin symmetry breaking in $\mth{\rho\rightarrow\pi\gamma}$ decay

X.-J. Wang1, J.-H. Jiang2 and M.-L. Yan2, 3

1  Institution of Theoretical Physics, Beijing, 100080, PRC
2  Center for Fundamental Physics, University of Science and Technology of China Hefei, Anhui 230026, PRC
3  CCAST(World Lab), P.O. Box 8730, Beijing, 100080, PRC

wangxj@itp.ac.cn

(Received: 7 January 2002 / Revised version: 25 March 2002 Communicated by V.V. Anisovich)

Abstract
In terms of effective field theory and mixed-propagator approach, we show that there is a larger hidden effect of isospin breaking in $\rho^0\rightarrow\pi^0\gamma$ decay due to a $\omega$ exchange, $\rho^0\rightarrow\omega\rightarrow\pi^0\gamma$. The branching ratio is predicted as $B(\rho^0\rightarrow\pi^0\gamma)=(11.67\pm 2.0)\times 10^{-4}$, which is much larger than Particle Data Group's datum $(6.8\pm 1.7)\times 10^{-4}$ and one of charged mode, $B(\rho^\pm\rightarrow\pi^\pm\gamma)=(4.5\pm 0.5)\times 10^{-4}$.

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.

© Società Italiana di Fisica, Springer-Verlag 2002

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