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Register a new userThe $phi(1020)topi^0pi^0gamma$ decay
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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.
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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.
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}.
Rare radiative decay $phitoetapi^0gamma$ was studied with SND detector at {VEPP-2M} electron-positron collider and its branching ratio was measured: $B(phitoetapi^0gamma)=(0.88pm0.14pm0.09)cdot 10^{-4}$. Significant contribution of the $a_0(980)gamma$ intermediate state was observed in the decay. The result is based on total integrated luminosity corresponding to $2cdot10^7$ produced $phi$ mesons.
We present the measurement of the $phi$(1020)$rightarrow e^{+}e^{-}$ transverse momentum spectrum and yield for $0.3 < p_{T} < 2.5$ GeV at mid-rapidity ($|y| < 1$) from the STAR experiment in Au+Au collisions at $sqrt{s_{_{NN}}} = 200$ GeV and compare it to the yield and spectrum from the hadronic decays. We also compare the $phi$(1020) mass and width obtained by fitting Breit-Wigner function to simulated values. Particle identification based on the newly installed STAR Time-Of-Flight (TOF) detector in conjunction with energy-loss (dE/dx) based particle identification measurements from the Time Projection Chamber (TPC) are used for a clean electron and positron identification.
In the SND experiment at VEPP-2M e^+e^- collider the phi(1020) ---> eta+gamma ---> 3pi^0+gamma decay was studied. The branching ratio B(phi--->eta+gamma) = (1.246 +- 0.025 +- 0.057)% was measured.
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