196 research outputs found

    New observations of the NGC 1275 phenomenon

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    Wetensch. publicatieFaculteit der Wiskunde en Natuurwetenschappe

    Near Threshold Pion Production via 2-H(p,pi-0)3-He

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    This research was sponsored by the National Science Foundation Grant NSF PHY-931478

    Pionium Production in the Cooler

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    This research was sponsored by the National Science Foundation Grant NSF PHY-931478

    Pionium Production in the Cooler

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    This research was sponsored by the National Science Foundation Grant NSF PHY-931478

    Determination of the Strange Quark Content of the Nucleon from a Next-to-Leading-Order QCD Analysis of Neutrino Charm Production

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    We present the first next-to-leading-order QCD analysis of neutrino charm production, using a sample of 6090 νμ\nu_\mu- and νˉμ\bar\nu_\mu-induced opposite-sign dimuon events observed in the CCFR detector at the Fermilab Tevatron. We find that the nucleon strange quark content is suppressed with respect to the non-strange sea quarks by a factor \kappa = 0.477 \: ^{+\:0.063}_{-\:0.053}, where the error includes statistical, systematic and QCD scale uncertainties. In contrast to previous leading order analyses, we find that the strange sea xx-dependence is similar to that of the non-strange sea, and that the measured charm quark mass, mc=1.70±0.19GeV/c2m_c = 1.70 \pm 0.19 \:{\rm GeV/c}^2, is larger and consistent with that determined in other processes. Further analysis finds that the difference in xx-distributions between xs(x)xs(x) and xsˉ(x)x\bar s(x) is small. A measurement of the Cabibbo-Kobayashi-Maskawa matrix element Vcd=0.2320.020+0.018|V_{cd}|=0.232 ^{+\:0.018}_{-\:0.020} is also presented. uufile containing compressed postscript files of five Figures is appended at the end of the LaTeX source.Comment: Nevis R#150

    Observation of exclusive DVCS in polarized electron beam asymmetry measurements

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    We report the first results of the beam spin asymmetry measured in the reaction e + p -> e + p + gamma at a beam energy of 4.25 GeV. A large asymmetry with a sin(phi) modulation is observed, as predicted for the interference term of Deeply Virtual Compton Scattering and the Bethe-Heitler process. The amplitude of this modulation is alpha = 0.202 +/- 0.028. In leading-order and leading-twist pQCD, the alpha is directly proportional to the imaginary part of the DVCS amplitude.Comment: 6 pages, 5 figure
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