2018 Impact factor 2.481
Hadrons and Nuclei
Eur. Phys. J. A 16, 209-219 (2003)
DOI: 10.1140/epja/i2002-10084-x

Mixing and decays of $\mth{\rho}$- and $\mth{\omega}$-mesons

Ya.I. Azimov

Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg, 188300, Russia

azimov@pa1400.spb.edu

(Received: 16 September 2002 / Published online: 4 February 2003)

Abstract
Isospin-violating mixing of $\rho$- and $\omega$-mesons is reconsidered in terms of propagators. Its influence on various pairs of $(\rho^0,\,\omega)$-decays to the same final states is demonstrated. Some of them, $(\rho^0,\,\omega)\to\pi^+\pi^-$ and $(\rho^0,\,\omega)\to\pi^0\gamma$, have been earlier discussed in the literature, others (e.g., $(\rho^0,\,\omega)\to
\eta\gamma$ and $(\rho^0,\,\omega)\to e^+e^-$) are new in this context. Changes in partial widths for all the decay pairs are shown to be correlated. The set of present experimental data, though yet inconclusive, provides some limits for the direct $(\rho\omega)$-coupling and indirectly supports enhancement of $\rho^0\to\pi^0\gamma$ in comparison with $\rho^{\pm}\to\pi^{\pm}\gamma$, though not so large as in some previous estimates.

PACS
11.30.Ly - Other internal and higher symmetries.
13.25.Jx - Decays of other mesons.
14.40.Cs - Other mesons with S=C=0, mass < 2.5 GeV.

© Società Italiana di Fisica, Springer-Verlag 2003