54 research outputs found

    The Physics of the B Factories

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    LXXXV. A power law of the viscosity of liquids

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    Heat-Released Volatile Sulfur Compounds in Milk

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    VECTOR MESON PRODUCTION BY POLARIZED PHOTONS AT 2.8, 4.7 AND 9.3 GeV

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    We present results on vector meson photoproduction via +yp-. Vp in the LBL-SLAC 82 ” hydrogen bubble chamber exposed to a linearly polarized photon beam at 2.8, 4.7 and 9.3 GeV. We find p ” production to have the characteristics of a diffractive process, i.e., a cross section decreasing slowly with energy and a differential cross section with slope of- 6.5 GeV-2. Within errors the p ” production amplitudes are entirely due to natural parity exchange. S-channel helicity is conserved to a high degree in the y--+p ’ transition. We find evidence for small helicity flip amplitudes for 7rr pairs in the,o ” region. Photoproduction of w mesons is separated into its natural (aN) and unnatural (vu) parity ex-change contributions. The E-Y and t-dependence and the spin density matrix of the unnatural parity exchange contribution are consistent with an OPE process. The natural parity exchange part has characteristics similar to p ” production
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