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Your search keyword '"G. Conforto"' showing total 4 results
Start Over Author "G. Conforto" Journal zeitschrift fur physik c particles and fields
4 results on '"G. Conforto"'

1. Analysis of the 33-133-133-1final state in photon-photon collisions

Author

S. Lowe, M. Reidenbach, D. Besset, D. Antreasyan, A. M. Cartacci, G. Glaser, A. C. König, R. Cowan, Grzegorz Nowak, C. W. Peck, F. H. Heinsius, B. Lurz, H. W. Bartels, P. McBride, B. Renger, G. Conforto, U. Volland, G.L. Godfrey, P. Ratoff, H. Marsiske, K. Wachs, R. T. Van de Walle, G. Landi, K. Wacker, P. Schmitt, J. Irion, W. Lockman, H. Meyer, W. Koch, D. Gelphman, J. Schütte, H. J. Trost, S. Krüger, K. Graaf, T. Kiel, C. Rippich, S. Leffler, P. G. Pelfer, Elliott D. Bloom, V. Stock, H. Wegener, Andrea Bizzeti, F. Messing, D. Sievers, B. Pollock, D. A. Williams, J. Gaiser, M. Cavalli-Sforza, M. Kobel, Hans J. Vogel, H. Janssen, A. M. Litke, R. Cabenda, A. Engler, B. Monteleoni, Z. Jakubowski, R. Hofstadter, H. Kilian, A. Schwarz, R. W. Kraemer, S. Keh, B. Niczyporul, B. Muryn, A. Voigt, T. Koiber, K. Fairfield, W. Maschmann, S. Cooper, I. Kirkbride, D. Marlow, R. Clare, Tomasz Skwarnicki, F. C. Porter, F. H. Heimlich, D. Prindle, K. Brockmüller, A. Fridman, B. van Uitert, J. Tompkins, U. Strohbusch, J. Schotanus, A. Compagnucci, Ch Bieler, K. Strauch, I. C. Brock, R. Lekebusch, G. Folger, W. J. Metzger, S. Lee, K. Königsmann, D. G. Coyne, K. Karch, R. Nernst, W. Walk, P. Zschorsch, T. Lesiak, J. K. Bienlein, and M. Scheer

Subjects
Nuclear physics, Physics, Photon, Physics and Astronomy (miscellaneous), Meson, Mass distribution, Dalitz plot, Resonance, DESY, Invariant mass, Atomic physics, Engineering (miscellaneous), Crystal Ball
Abstract

The reactione + e - →e + e - ηπ0π0→e + e - 6γ has been analysed using the full data sample taken with the Crystal Ball detector at the DORIS II storage ring at DESY. The ηπ0π0 invariant mass spectrum is dominated by the η', for which we determine the radiative width Γγγ(η') to be (4.5±0.3±0.5)keV. Near 1.9 GeV/c2 we observe a second enhancement in the ηπ0π0 mass distribution. Assuming that these events are created by the production and subsequent decay of a wide resonanceX(1900), we have investigated the decay modes, the invariant mass distributions of the ηπ0 and π0π0 subsystems and the angular distributions of the final state mesons. We find that the data is best described byJ PC=2∓. For thisJ P assignment the resonance parameters are Γγγ(X) BR(X→ηππ)=(0.95±0.27±0.20) keV Γtot (X)=(221±92±44)MeV, andM(X)=(1881±32±40) MeV/c2.

Published
1992
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2. Observation of the exclusive decayB→evD * and search forB→evπ 0

Author

J. Tompkins, K. Königsmann, M. Scheer, H. Meyer, K. Wacker, P. Schmitt, Elliott D. Bloom, B. Lurz, Z. Jakubowski, W. Koch, B. Niczyporuk, D. Sievers, H. Janssen, M. Reidenbach, W. Walk, S. Lowe, A. M. Cartacci, G. Glaser, A. C. König, F. H. Heinsius, S. Keh, K. Fairfield, W. Maschmann, S. Cooper, J. Schotanus, S. Leffler, P. G. Pelfer, H. W. Bartels, J. Schütte, A. Compagnucci, H. Wegener, R. Clare, K. Strauch, T. Lesiak, B. Monteleoni, J. K. Bienlein, D. Gelphman, S. Krüger, K. Karch, T. Kiel, B. Muryn, R. Lekebusch, G. Folger, W. J. Metzger, D. A. Williams, H. Kilian, Tomasz Skwarnicki, F. C. Porter, Ch Bieler, V. Stock, Andrea Bizzeti, G. Landi, A. M. Litke, J. Irion, K. Graaf, M. Kobel, A. Schwarz, D. Antreasyan, P. McBride, A. Voigt, C. W. Peck, G. Conforto, D. G. Coyne, U. Strohbusch, H. Marsiske, I. Kirkbride, R. Hofstadter, F. H. Heimlich, Grzegorz Nowak, U. Volland, K. Brockmüller, K. Wachs, A. Fridman, B. van Uitert, G.L. Godfrey, R. T. Van de Walle, and M. Cavalli-Sforza

Subjects
Physics, Nuclear physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Engineering (miscellaneous), Storage ring, Crystal Ball
Abstract

The Crystal Ball detector at thee+e− storage ring DORIS II has been used to analyze exclusive semileptonic decays ofB mesons produced at γ(4S) energies. The decayB→evD* has been observed with a branching ratio of (7.0±1.8±1.4)% using theπ°D decay mode of theD*. In addition we have searched for the exclusive semileptonic decayB±→e±vπ0. We find an upper limit onB±→e±vπ0 of 0.22% at the 90% CL.

Published
1990
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3. Experimental upper limits for the hadronic transitions Υ(2S)→ηΥ(1S) and Υ(2S)→π0Υ(1S)

Author

W. Walk, M. Scheer, David R. Williams, B. Monteleoni, B. Niczyporuk, P. Zschorsch, Grzegorz Nowak, T. Kloiber, U. Volland, R. Nernst, D. Coyne, R. Lee, M. Cavalli-Sforza, D. Marlow, Z. Jakubowski, T. Matsui, W. J. Metzger, S. Lowe, T. Skwarnicki, J. Schotanus, K. Strauch, S. Cooper, J. Tompkins, R. Lekebusch, G. Folger, J. K. Bienlein, R. Cabenda, S. Leffler, P. G. Pelfer, K. Königsmann, H. Wegener, H. J. Trost, K. Wacker, P. Schmitt, P. Ratoff, R. W. Kraemer, D. Gelphman, A. M. Litke, U. Strohbusch, J. Gaiser, Elliott D. Bloom, I. C. Brock, J. Irion, W. Lockman, F. Messing, W. Koch, F. C. Porter, A. Engler, H. Kilian, D. Antreasyan, C. W. Peck, G. Conforto, C. Edwards, R. T. Van de Walle, D. Prindle, C. Rippich, Hans J. Vogel, R. Cowan, F. H. Heimlich, B. Lurz, Robert Hofstadter, D. Sievers, B. Pollock, D. Besset, A. M. Cartacci, A. C. König, B. Renger, I. Kirkbride, A. Fridman, G. Godfrey, A. Schwarz, S. Keh, W. Maschmann, and R. Clare

Subjects
Nuclear physics, Physics, Particle decay, Particle physics, Pair production, Pion, Muon, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Dalitz plot, Engineering (miscellaneous), Crystal Ball
Abstract

Using the Crystal Ball detector at thee +e− storage ring DORIS-II, we have searched for the hadronic transitions Υ(2S)→ηΥ(1S) and Υ(2S)→π0Υ(1S) in exclusive decays where the Υ(1S) decays into ane +e− or aµ + µ - pair and the η and π0 are detected by their decay modes η→γγ, η→γγ and π0→γγ. From the number of observed events we derive, after consideration of possible background sources, upper limits on the branching ratiosB(Υ(2S)→ηΥ(1S))

Published
1987
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4. Determination ofГ ee of the Υ(1S) and Υ(2S) resonances, and measurement ofR atW=9.39 GeV

Author

D. Antreasyan, G. Landi, F. Messing, T. Kloiber, M. Reidenbach, P. Ratoff, W. Walk, H. Janssen, G. Drews, S. Krüger, H. Meyer, T. Kiel, J. Irion, C. W. Peck, R. Lee, C. Pols, K. Wacker, H. J. Trost, P. Schmitt, David R. Williams, C. Rippich, Elliott D. Bloom, J. Tompkins, B. Muryn, A. Voigt, R. Nernst, H. Marsiske, D. Coyne, D. Marlow, B. Lurz, I. Kirkbride, F. Selonke, Ch Bieler, K. Karch, W. J. Metzger, C. Pegel, B. Niczyporuk, K. Brockmüller, W. Lockmann, D. Sievers, I. C. Brock, G. Conforto, A. Fridman, B. van Uitert, D. Prindle, A. Engler, Robert Hofstadter, K. Graaf, G. Folger, H. Kilian, J. Schütte, F. C. Porter, K. Königsmann, S. Keh, J. Gaiser, M. Scheer, R. T. Van de Walle, K. Fairfield, G. Godfrey, W. Maschmann, R. Clare, J. Schotanus, R. Cabenda, P. Zschorsch, A. Compagnucci, F. H. Heimlich, J. K. Bienlein, P. McBride, K. Strauch, Z. Jakubowski, R. Cowan, R. W. Kraemer, V. Stock, Andrea Bizzeti, U. Strohbusch, Hans J. Vogel, D. Gelphman, M. Kobel, A. Schwarz, S. Lowe, H. W. Bartels, M. Cavalli-Sforza, Grzegorz Nowak, U. Volland, K. Wachs, D. Besset, A. M. Cartacci, G. Glaser, R. Lekebusch, A. C. König, F. H. Heinsius, W. Koch, B. Renger, Tomasz Skwarnicki, S. Leffler, P. G. Pelfer, H. Wegener, B. Monteleoni, B. Pollock, and A. M. Litke

Subjects
Nuclear physics, Physics, Particle decay, Muon, Pair production, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Hadron, Quarkonium, Engineering (miscellaneous), Crystal Ball
Abstract

Using the Crystal Ball detector operating at the DORIS II storage ring we have measured the leptonic partial widthsГ ee of the Υ(1S) and Υ(2S) resonances. We find $$\Gamma _{ee} (\Upsilon (1S)) = 1.34 \pm 0.03 \pm 0.06keV$$ and $$\Gamma _{ee} (\Upsilon (2S)) = 0.56 \pm 0.04 \pm 0.02keV.$$ The effect onГ ee of applying different prescriptions for radiative corrections is discussed. We also measureR, the ratio of non-resonant hadronic cross section to the Born cross section of μ pair production, at c.m. energyW=9.39 GeV to beR=3.48±0.04±0.16.

Published
1988
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