34 research outputs found

    Study of the Process e+eKL0KS0e^+e^- \to K^0_L K^0_S in the C.M.Energy Range 1.05-1.38 GeV with CMD-2

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    The process e+eKL0KS0e^+e^- \to K^0_L K^0_S has been studied with the CMD-2 detector using about 950 events detected in the center-of-mass energy range from 1.05 to 1.38 GeV. The cross section exceeds the expectation based on the contributions of the rho(770), omega(782) and phi(1020) mesons only.Comment: 12 pages, 3 figures, uses elsart.cls, submitted to Physics Letters

    Cross section of the reaction e+eπ+ππ+πe^+ e^- \to \pi^+\pi^-\pi^+\pi^- below 1 GeV at CMD-2

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    Using 3.07 pb1{pb}^{-1} of data collected in the energy range 0.60-0.97 GeV by CMD-2, about 150 events of the process \epm \to \pch have been selected. The energy dependence of the cross section agrees with the assumption of the a1(1260)πa_1(1260) \pi intermediate state which is dominant above 1 GeV. For the first time \fourpi events are observed at the ρ\rho meson energy. Under the assumption that all these events come from the ρ\rho meson decay, the value of the cross section at the ρ\rho meson peak corresponds to the following decay width: \Gamma(\rho^0 \to \fourpi) = (2.8 \pm 1.4 \pm 0.5) {keV} or to the branching ratio B(\rho^0 \to \fourpi) = (1.8 \pm 0.9 \pm 0.3) \cdot 10 ^{-5}.Comment: 15 pages, 5 figure

    Study of the Process e+ e- --> omega pi0 --> pi0 pi0 gamma in c.m. Energy Range 920--1380 MeV at CMD-2

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    The cross section of the process e+ e- --> omega pi0 --> pi0 pi0 gamma has been measured in the c.m. energy range 920-1380 MeV with the CMD-2 detector. Its energy dependence is well described by the interference of the rho(770) and rho'(1450) mesons decaying to omega pi0. Upper limits for the cross sections of the direct processes e+ e- --> pi0 pi0 gamma, eta pi0 gamma have been set.Comment: Accepted for publication in PL

    New precise determination of the \tau lepton mass at KEDR detector

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    The status of the experiment on the precise τ\tau lepton mass measurement running at the VEPP-4M collider with the KEDR detector is reported. The mass value is evaluated from the τ+τ\tau^+\tau^- cross section behaviour around the production threshold. The preliminary result based on 6.7 pb1^{-1} of data is mτ=1776.800.23+0.25±0.15m_{\tau}=1776.80^{+0.25}_{-0.23} \pm 0.15 MeV. Using 0.8 pb1^{-1} of data collected at the ψ\psi' peak the preliminary result is also obtained: ΓeeBττ(ψ)=7.2±2.1\Gamma_{ee}B_{\tau\tau}(\psi') = 7.2 \pm 2.1 eV.Comment: 6 pages, 8 figures; The 9th International Workshop on Tau-Lepton Physics, Tau0

    Measurement of \Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-) and \Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-)

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    The products of the electron width of the J/\psi meson and the branching fraction of its decays to the lepton pairs were measured using data from the KEDR experiment at the VEPP-4M electron-positron collider. The results are \Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-)=(0.3323\pm0.0064\pm0.0048) keV, \Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-)=(0.3318\pm0.0052\pm0.0063) keV. Their combinations \Gamma_{ee}\times(\Gamma_{ee}+\Gamma_{\mu\mu})/\Gamma=(0.6641\pm0.0082\pm0.0100) keV, \Gamma_{ee}/\Gamma_{\mu\mu}=1.002\pm0.021\pm0.013 can be used to improve theaccuracy of the leptonic and full widths and test leptonic universality. Assuming e\mu universality and using the world average value of the lepton branching fraction, we also determine the leptonic \Gamma_{ll}=5.59\pm0.12 keV and total \Gamma=94.1\pm2.7 keV widths of the J/\psi meson.Comment: 7 pages, 6 figure

    On kinematical constraints in boson-boson systems

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    We consider the scattering of two-bosons with negative parity and spin 0 or 1. Starting from helicity partial-wave scattering amplitudes we derive transformations that eliminate all kinematical constraints. Such amplitudes are expected to satisfy partial-wave dispersion relations and therefore provide a suitable basis for data analysis and the construction of effective field theories. Our derivation relies on a decomposition of the various scattering amplitudes into suitable sets of invariant functions. A novel algebra was developed that permits the efficient computation of such functions in terms of computer algebra codes.Comment: 14 pages, 8 table

    Measurement of e+e- -> phi -> K+K- cross section with the CMD-2 detector at VEPP-2M Collider

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    The process e+ e- -> phi -> K+ K- has been studied with the CMD-2 detector using about 542 000 events detected in the center-of-mass energy range from 1.01 to 1.034 GeV. The systematic error of the cross section is estimated to be 2.2%. The phi(1020) meson parameters in the phi -> K+K- decay channel have been measured: sigma_0(phi-> K+K-) = 2016 +- 8 +- 44 nb, m(phi) = 1019.441 +- 0.008 +- 0.080 MeV/c2, Gamma(phi) = 4.24 +- 0.02 +- 0.03 MeV, B(e+e-)B(K+K-) = (14.27 +- 0.05 +- 0.31)*10(-5).Comment: 12 pages, 6 figures, 2 tables, uses elsart.cls (second version - some figures are corrected

    First observation of the ϕπ+πγ\phi\to\pi^+\pi^-\gamma decay

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    Radiative decays of the ϕ\phi meson have been studied using a data sample of about 20 million ϕ\phi decays collected by the CMD-2 detector at VEPP-2M collider in Novosibirsk. From selected e+eπ+πγe^+e^-\to\pi^{+}\pi^{-}\gamma events the ϕπ+πγ\phi\to\pi^{+}\pi^{-}\gamma decay has been observed for the first time. \par Under the assumption that the intermediate f0(980)γf_{0}(980)\gamma state dominates in the ϕπ+πγ\phi \to \pi^+\pi^-\gamma decay, the corresponding branching ratio is Br(ϕf0(980)γ)=(1.93±0.46±0.50)×104Br(\phi\to f_{0}(980)\gamma)=(1.93\pm 0.46\pm 0.50)\times10^{-4}. \par Selected e+eμ+μγe^+e^-\to\mu^+\mu^-\gamma events were used to obtain Br(ϕμ+μγ)=(1.43±0.45±0.14)×105Br(\phi\to\mu^+\mu^-\gamma) =(1.43\pm 0.45\pm 0.14)\times10^{-5} for Eγ>20E_{\gamma}>20 MeV. \par Using the same data sample, upper limits at 90% CL have been obtained for the C-violating decay of the ϕ\phi: Br(ϕργ)<1.2×105Br(\phi\to\rho\gamma) < 1.2\times10^{-5}; and for the P- and CP-violating decay of the η\eta: \par Br(ηπ+π)<3.3×104Br(\eta\to\pi^+\pi^-) < 3.3\times10^{-4}.Comment: 16 pages, 10 figures, Submitted to Phys. Lett.
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