A search for φ radiative decays has been performed using a data sample of about 2.0 million φ decays collected by the CMD-2 detector at VEPP-2M collider in Novosibirsk. From the selected e+e−→π+π−γ events the following results were obtained: B(φ→f0(980)γ)<1×10−4 for destructive and B(φ→f0(980)γ)<7×10−4 for constructive interference with the Bremsstrahlung process respectively, B(φ→γ→π+π−γ)<3×10−5 for Eγ>20 MeV, B(φ→ργ)<7×10−4. From the selected e+e−→μ+μ−γ events B(φ→μ+μ−γ)=(2.3±1.0)×10−5 has been obtained for Eγ>20 MeV. The upper limit on the P,CP-violating decay η→π+π− has also been placed: B(η→π+π−)<9×10−4. All upper limits are at 90% C.L.
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Akhmetshin et al. (1997) studied this question.
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