Study of the process $e^+ e^- \to \omega \pi^0$ in the $\phi$-meson mass region with the KLOE detector - INSPIRE

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Study of the process $e^+ e^- \to \omega \pi^0$ in the $\phi$ -meson mass region with the KLOE detector

KLOE

Collaboration

•

F. Ambrosino
(
- Naples U. and
- INFN, Naples
)

Jul, 2008

12 pages

Published in:

Phys.Lett.B 669 (2008) 223-228

e-Print:

0807.4909 [hep-ex]

DOI:

10.1016/j.physletb.2008.09.056

PDG:

{{\mathit \omega}{(782)}}

\rightarrow

{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}

Experiments:

FRASCATI-DAFNE-KLOE

View in:

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Abstract: (Elsevier)

We have studied the e+e−→ωπ0 cross section in the s interval 1000–1030 MeV using the π+π−π0π0 and π0π0γ final states with a sample of ∼600 pb−1 collected with the KLOE detector at DAΦNE. By fitting the observed interference pattern around Mϕ for both final states, we extract the ratio of the decay widths Γ(ω→π0γ)/Γ(ω→π+π−π0)=0.0897±0.0016 and derive the branching fractions BR(ω→π+π−π0)=(90.24±0.19)% , BR(ω→π0γ)=(8.09±0.14)% . The parameters describing the e+e−→π+π−π0π0 reaction around Mϕ are also used to extract the branching fraction for the OZI and G-parity violating ϕ→ωπ0 decay: BR(ϕ→ωπ0)=(4.4±0.6)×10−5 .

e + e - collisions
Rare phi decays
VMD
OZI violation
Isospin violation
e+e− collisions
Rare ϕ decays
[formula omitted] collisions
electron positron: annihilation
omega(783): electroproduction

References(14)

Figures(4)

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)

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