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Languages : en
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Measurements of the two body decays of the J/[psi] into vector and pseudoscalar meson pairs are presented. Using the measured branching ratios, a phenomenological model of J//psi/ decays indicates that the [eta] and [eta]' are composed only of light and strange quarks, without a gluonium contribution in the [eta]' wavefunction. A measurement of J//psi/ .-->. .gamma pi./sup +/.pi./sup -/.pi./sup +/.pi./sup -/ is presented. The f1 (1285) is observed and its spin and parity are investigated. The /eta//sub c/ is observed to decay to /rho/°/rho/°, and first indications of /eta//sub c/ decays to f2f2 are presented. The spin and parity of the /eta//sub c/ are investigated. 5 figs., 3 figs., 1 tab.
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Languages : en
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Measurements of the two body decays of the J/[psi] into vector and pseudoscalar meson pairs are presented. Using the measured branching ratios, a phenomenological model of J//psi/ decays indicates that the [eta] and [eta]' are composed only of light and strange quarks, without a gluonium contribution in the [eta]' wavefunction. A measurement of J//psi/ .-->. .gamma pi./sup +/.pi./sup -/.pi./sup +/.pi./sup -/ is presented. The f1 (1285) is observed and its spin and parity are investigated. The /eta//sub c/ is observed to decay to /rho/°/rho/°, and first indications of /eta//sub c/ decays to f2f2 are presented. The spin and parity of the /eta//sub c/ are investigated. 5 figs., 3 figs., 1 tab.
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Languages : en
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The MARK III detector at the SPEAR ee/sup /minus// storage ring at SLAC accumulated a data sample of 5.8 × 106 J/[psi] produced in 1982, '83 and '85. Recent results in radiative decays, including different decay modes of the /eta//sub c/ and the search for scalars, are presented. The systematic study of the hadronic decays of the J//psi/ into a vector-tensor meson pair is discussed, and a detailed analysis of the decay mode J//psi/ .-->. .omega.f2(1270) is described. 12 refs., 12 figs., 1 tab.
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Category : Power resources
Languages : en
Pages : 840
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Category : Physics
Languages : en
Pages : 862
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Category : Power resources
Languages : en
Pages : 600
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Category : Power resources
Languages : en
Pages : 652
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Languages : en
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New results on the zeta(2.2) are reported. Mark III has analyzed new J/psi data and reconfirmed the zeta(2.2) in radiative J/psi decays to K/sub S/°K/sub S/° and KK−. The significances of the signals are 3.6 and 4.5 standard deviations, the masses, 2.232 +- 007 +- 007 and 2.230 +- 006 +- 014 GeV/c2, and the widths, 0.018/sub -.015//sup +.023/ +- 010 and 0.026/sub -.016//sup +.020/ +- 017 GeV/c2, for the K/sub S/°K/sub S/° and KK− modes, respectively. The branching ratios are BR(J/psi .-->. .gamma.zeta, zeta .-->. K/sub S/°K/sub S/°) = (3.2/sub -1.3//sub +1.6/ +- 0.7) x 10−5 and BR(J/psi .-->. .gamma.zeta, zeta .-->. K+K−) = (4.2/sub -1.4//sup +1.7/ +- 0.8) x 10−5. 14 refs., 9 figs.
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Category : Nuclear energy
Languages : en
Pages : 866
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First results from the MARK III detector at SPEAR are presented based on 2.7 million J/psi decays. The eta/sub c/ is observed in three modes, J/psi ..-->.. ..gamma..eta/sub c/, (eta/sub c/ ..-->.. rho anti rho, eta..pi ... pi..−, and phi phi). Using the phi phi mode, the eta/sub c/ spin-parity is determined to be 0−. The known radiative J/psi decays J/psi ..-->.. ..gamma..f(f ..-->.. ..pi ... pi..−), ..gamma..eta'(eta' ..-->.. ..gamma..rho°, eta..pi..+..pi..−), ..gamma..f'(f' ..-->.. kappa+kappa−), ..gamma..theta(theta ..-->.. kappa anti kappa), and ..gamma..iota(iota ..-->.. ..pi..kappa anti kappa) are observed and their branching ratios found to be in agreement with previous measurements. In the J/psi ..-->.. ..gamma..kappa+kappa− mode a new state is observed at 2.22 GeV and in the J/psi ..-->.. ..gamma gamma..rho° and ..gamma..eta..pi../sup +/..pi..− modes evidence for new structures near 1.4 GeV is presented. 29 references.
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Category : Particles (Nuclear physics)
Languages : en
Pages : 600
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