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Register a new userObservation of the decay PHI(1020)--->OMEGA+PI0
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The reaction e^+e^- ---> OMEGA+PI0 ---> PI+PI- 2PI0 has been studied with SND detector at VEPP-2M e^+e^- collider in the vicinity of the PHI(1020) meson resonance. The observed interference pattern in the energy dependence of the cross section is consistent with existence of the decay PHI ---> OMEGA+PI0 with a branching ratio of B(PHI ---> OMEGA+PI0)=(4.8+1.9-1.7+-0.8)x10^{-5}. The real and imaginary parts of the decay amplitude were measured. The PHI ---> OMEGA+PI0 decay was observed for the first time.
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Signal of the rare radiative decay PHI--->ETA+PI0+GAMMA was observed in the SND experiment at VEPP-2M electron-positron collider.The result is based on the analysis of data, corresponding to a total integrated luminosity of 4 pb^{-1}, or 8x10^6 PHI mesons produced. The measured branching ratio of PHI--->ETA+PI0+GAMMA decay is equal to (0.83+-0.23)x10^{-4}.
Using a data sample corresponding to an integrated luminosity of 2.93 fb$^{-1}$ collected at a center-of-mass energy $sqrt{s}=3.773$ GeV by the BESIII detector, the decay $D^0toomegaphi$ is observed for the first time. The branching fraction is measured to be $(6.48 pm 0.96 pm 0.38)times 10^{-4}$ with a significance of $6.3 sigma$, where the first and second uncertainties are statistical and systematic, respectively. An angular analysis reveals that the $phi$ and $omega$ mesons from the $D^0 to omega phi$ decay are transversely polarized.
In the SND experiment at VEPP-2M $e^+e^-$ collider the $phi(1020)topi^0pi^0gamma$ decay was studied and its branching ratio was measured: $B(phitopi^0pi^0gamma)=(1.221pm 0.098pm0.061)cdot10^{-4}$. It was shown, that $f_0(980)gamma$ intermediate state dominates in this decay and the $f_0(980)$-meson parameters were obtained.
We describe searches for B meson decays to the charmless vector-vector final states omega omega and omega phi with 471 x 10^6 B Bbar pairs produced in e+ e- annihilation at sqrt(s) = 10.58 GeV using the BABAR detector at the PEP-II collider at the SLAC National Accelerator Laboratory. We measure the branching fraction B(B0 --> omega omega) = (1.2 +- 0.3 +0.3-0.2) x 10^-6, where the first uncertainty is statistical and the second is systematic, corresponding to a significance of 4.4 standard deviations. We also determine the upper limit B(B0 --> omega phi) < 0.7 x 10^-6 at 90% confidence level. These measurements provide the first evidence for the decay B0 --> omega omega, and an improvement of the upper limit for the decay B0 --> omega phi.
We report a measurement of the $B^0rightarrowpsi(2S)pi^0$ branching fraction based on the full $Upsilon(4S)$ data set of $772times10^{6}$ $Bbar{B}$ pairs collected by the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We obtain $B(B^0rightarrowpsi(2S)pi^0) = (1.17pm0.17text{(stat)}pm0.08text{(syst)})times10^{-5}$. The result has a significance of 7.2 standard deviations and is the first observation of the decay $B^0rightarrowpsi(2S)pi^0$.
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