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102. Spin analysis of theχbstates

Author

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

Subjects
Physics, Nuclear physics, Cascade reaction, Spins, Angular correlation, Electron–positron annihilation, General Physics and Astronomy, Spin (physics), Crystal Ball
Abstract

Angular correlations in the cascade reaction e+e−→Υ(2S)→γχb, χb→γΥ, Υ→μ+μ− or Υ→e+e−, have been used for the first time to investigate the spins of the χb states. The results support the χb spins predicted by the potential models of heavy quarkonia.

Published
1987
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103. Study of the δ(970)-meson

Author

B. Conforto, D. H. Tompkins, G. Conforto, D. Underwood, M. A. Kramer, M. S. Witherell, R. M. Mobley, R. Prepost, and A.W. Key

Subjects
Physics, Particle physics, Meson, General Physics and Astronomy
Published
1978
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104. Formation of the pseudoscalarsπ0,η, and η’ in the reactionγγ→γγ

Author

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

Subjects
Nuclear physics, Physics, Meson, Pi, Resonance, DESY, Storage ring, Crystal Ball, Gamma gamma
Abstract

The Crystal Ball detector has been used at the DORIS II storage ring at DESY to study the reaction e+e−→e+e−γ*γ*→e+e−γγ, where X is a narrow resonance with mass between 100 and 3000 MeV. Formation of π0, η, and η’ mesons is observed, and the following meson partial widths are obtained: Γπ0Γ0→γγ=7.7±0.5±0.5 eV, Γη−γγ=0.514±0.017±0.035 keV, and Γη’→γγ=4.7±0.5±0.5 keV. No other narrow resonances are observed, and upper limits are given for the product ΓX→γγBX→γγ. .AE

Published
1988
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105. 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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106. Observation of ThreePStates in the Radiative Decay ofϒ(2S)

Author

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

Subjects
Physics, Nuclear physics, Particle decay, Annihilation, Meson, Branching fraction, Electron–positron annihilation, Hadron, Analytical chemistry, General Physics and Astronomy, Spectral line, Crystal Ball
Abstract

The inclusive photon spectrum in hadronic decays of the UPSILON(2S) is measured with the Crystal Ball detector at DORIS II. Four well separated photon lines, which are consistent with the decay hypothesis UPSILON(2S)..--> gamma..+ /sup 3/P/sub 2,1,0/ and /sup 3/P/sub 2,1/..--> gamma..+UPSILON(1S), are observed. The energies of the lines from the primary transitions are E/sub gamma1/ = 110.4 +- 0.8 +- 2.2 MeV, E/sub gamma2/ = 130.6 +- 0.8 +- 2.4 MeV and E/sub gamma3/ = 163.8 +- 1.6 +- 2.7 MeV; the branching fractions are (5.8 +- 0.7 +- 1.0)%, (6.5 +- 0.7 +- 1.2)%, and (3.6 +- 0.8 +- 0.9)%, respectively. The secondary transitions center at approx. =430 MeV with a combined branching fraction of (3.6 +- 0.7 +- 0.5)%.

Published
1985
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107. Formation ofdelta(980) andA2(1320) in photon-photon collisions

Author

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

Subjects
Physics, Nuclear physics, Photon, Pion, Meson, Hadron, Elementary particle, DESY, Atomic physics, Crystal Ball, Storage ring
Abstract

The reaction γγ→π0η has been investigated with the Crystal Ball detector at the DESY storage ring DORIS II. Formation of δ(980) and A2(1320) has been observed with γγ partial widths Γγγ(A2)=1.14±0.20±0.2 6 keV and Γγγ(δ)B(δ→πη)=0.19±0.07 −0.07+0.10 keV.

Published
1986
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108. Mass and Lifetime Limits on Supersymmetric Particles from a Proton Beam-Dump Experiment

Author

C. Castoldi, I. D. Leedom, G. Conforto, T. J. Roberts, E. S. Smith, J. S. Hoftun, R. Loveless, E. Wang, M. J. Longo, T. A. Romanowski, H. R. Gustafson, J. Volk, B. P. Roe, M. E. Duffy, C. T. Coffin, M. B. Crisler, R. C. Ball, S. Childress, Lawrence W. Jones, G. K. Fanourakis, D. L. Schumann, D.D. Reeder, and T. Y. Ling

Subjects
Physics, Particle physics, Proton, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, General Physics and Astronomy, Elementary particle, Supersymmetry, Gluon, law.invention, Nuclear physics, Massless particle, law, High Energy Physics::Experiment, Beam dump, Event (particle physics), Lepton
Abstract

Muonless events from the prompt-neutrino experiment at Fermilab have been analyzed to set limits on the masses and decays of supersymmetric particles by means of three measurements; (1) the ..nu../sub e//..nu../sub ..mu../ ratio, (2) the rate of events consisting of electromagnetic showers only, and (3) the event rate at large transverse momentum. These limits are based upon the absence of events above our visible energy cutoff of 20 GeV which could be attributed to supersymmetry. Several hypotheses concerning supersymmetric particle decays are considered.

Published
1984
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109. Measurement of the decay Υ(2S)→ππΥ(1S)

Author

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

Subjects
Physics, Nuclear physics, Particle decay, Pion, Meson, Branching fraction, Electron–positron annihilation, Hadron, Analytical chemistry, Crystal Ball, Bhabha scattering
Abstract

We have investigated the hadronic transitions UPSILON(2S) ..-->.. ..pi../sup 0/..pi../sup 0/UPSILON(1S) ..-->.. ..gamma gamma gamma gamma..l +l/sup -/ (l = ..mu.. or e) and UPSILON(2S) ..-->.. ..pi../sup +/..pi../sup -/UPSILON(1S) ..-->.. ..pi../sup +/..pi.. /sup -/e/sup +/e/sup -/ using the Crystal Ball detector at the DESY e/sup +/e/sup -/ storage ring DORIS II. Using the present world-average value of B/sub l/l(UPSILON(1S)) = 2.9 +- 0.3)% we derive branching ratios B(UPSILON(2S) ..-->.. ..pi../sup 0/..pi../sup 0/UPSILON(1S)) = (8.0 +- 1.5)% and B(UPSILON(2S) ..-->.. ..pi../sup +/..pi../sup -/UPSILON(1S)) = (16.9 +- 4.0)%. We also present results on the invariant-mass spectra and the angular distributions of the dipion system.

Published
1985
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111. Neutrino production by 400-GeV/cprotons in a beam-dump experiment

Author

Lawrence W. Jones, E. Wang, C. Castoldi, I. D. Leedom, M. E. Duffy, S. Childress, R. Loveless, D.D. Reeder, T. J. Roberts, H. R. Gustafson, C. T. Coffin, M. J. Longo, T. A. Romanowski, M. B. Crisler, B. P. Roe, G. Conforto, R. C. Ball, E. S. Smith, J. S. Hoftun, T. Y. Ling, G. K. Fanourakis, and J. Volk

Subjects
Semileptonic decay, Physics, Particle physics, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Hadron, Context (language use), Elementary particle, Nuclear physics, Particle decay, High Energy Physics::Experiment, Production (computer science), Energy (signal processing), Lepton
Abstract

The ${\ensuremath{\nu}}_{e}$ and ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ fluxes from decay of short-lived parents (presumed to be predominantly charmed particles) have been measured in a beam-dump experiment at Fermilab. Novel and important features of the experimental arrangement and procedures are presented and discussed in detail. Details of the analysis of the prompt flux and the backgrounds are presented together with a discussion of the systematic error. The energy and angular distributions of the prompt neutrino flux are presented, and the cross section for charm production is measured to be 57.2\ifmmode\pm\else\textpm\fi{}2.9\ifmmode\pm\else\textpm\fi{}8.5 \ensuremath{\mu}b/nucleon. The dependence of the cross section on atomic weight is measured to be ${\ensuremath{\sigma}}_{c}$\ensuremath{\propto}${A}^{0.75}$. The possibility that charm is produced by a mixture of central and diffractive processes is examined and discussed in the context of these results. The prompt fluxes of ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ and \ensuremath{\nu}${\ifmmode\bar\else\textasciimacron\fi{}}_{\ensuremath{\mu}}$ are roughly equal, as are the prompt fluxes of ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ and ${\ensuremath{\nu}}_{e}$. Quasielastic neutrino interactions were identified and used to provide an independent measurement of the flux which corroborates the energy calibration of the detector. A search for additional sources of prompt neutrinos beyond charm is reported. Negative results were obtained for supersymmetric particles, heavy neutral leptons, and b quarks, subject to the assumption of specific characteristics of the particles and the production mechanisms.

Published
1988
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112. The Michel parameter for the decay τ→eν

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Lorentz transformation, Elementary particle, DESY, Spectral line, Nuclear physics, symbols.namesake, Particle decay, Pair production, symbols, High Energy Physics::Experiment, Crystal Ball, Lepton
Abstract

The Crystal Ball detector at the Doris II storage ring at DESY has been used to study the electron energy spectrum of the decay τ→evv. In the standard model the Lorentz structure of the decay matrix element is of the well known V-A type, resulting in a Michel parameter of p =0.75. Our spectrum is found to be consistent with this value. A fit yields the value of 0.64±0.07.

Published
1989
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113. The large-volume detector (LVD) - a multipurpose underground detector at Gran Sasso

Author

Gabriella Sartorelli, R. Casaccia, Carlotta Castagnoli, E. Perotto, P. Salvadori, R. Scrimaglio, E. von Goeler, C. Dobrigkeit-Chincellato, J.A. Chincellato, C. Jing, Beat Jeckelmann, M. Defelice, V. P. Talochkin, O. Saavedra, A.S. Markov, Y. Dai, P. Vallania, D. Shambroom, W.R. Sheldon, L. Votano, A. Spallone, G. Navarra, M. Widgoff, G. D'Ali, G. Conforto, F.F. Khaichukov, F. Rohrbach, F. Palmonari, O. G. Ryazhskaya, D. Alyea, I. A. Pless, P. Galeotti, Giuseppe Iacobucci, G. Landi, T. Hara, Rosario Nania, G. Cini, V. F. Yakushev, T. Massam, Fabrizio Fabbri, G. Cara Romeo, C.Z. Zhao, F. Vetrano, Stefano Bianco, J. H. Moromisato, P. Rotelli, Isao Yamamoto, Lawrence Pinsky, V. Vasileyev, Giancarlo Susinno, G. Anzivino, F. Grianti, M. Deutsch, F. Artemi, Giuseppe Barbagli, M. Dardo, A. Zallo, Antonino Zichichi, Akeo Misaki, P. Giusti, P. V. Kortchaguin, V. S. Berezinsky, P. Diodati, Anderson Fauth, P. Picchi, G. Maccarrone, A. Turtelli, Kaushik De, Antonella Castellina, C. Del Papa, Y. Sun, M. Willutzky, B. Mayes, V. A. Kudryavtsev, M. Aryal, P. Shen, P.G. Pelfer, P. Haridas, A. Pitas, V. G. Ryassny, T. Kitamura, L. Caputi, Roy Weinstein, G. H. Mo, L. Din, C.S. Mao, Nobusuke Takahashi, Behcet Alpat, Q. Q. Zhu, A. Castelvetri, G. T. Zatsepin, M. Basile, G. Badino, C. Morello, E. Saletan, C. Aglietta, G. Jing, S. Vernetto, Y. Dong, G. Bari, G.C. Trinchero, S. Qian, G.E. Kocharov, J. Pyrlik, E. S. Hafen, V. B. Kortchaguin, S. De Pasquale, M. Italiani, Elena Korolkova, Y.R. Wu, Y. Yuan, V. L. Dadykin, Y. Minorikawa, L. Periale, Piera Luisa Ghia, Andrea Contin, Tomonori Wada, Z. Shi, V. O'Shea, Luisa Cifarelli, A.M. Shapiro, G. Ji, G. Bruni, Kwong Lau, Z. Lu, F. Lipps, S. Wang, W. Fulgione, D. Sanders, H.H. Huang, M. Enorini, G. Di Sciascio, I. Laakso, F. Cindolo, L. Bergamasco, and N. Inoue

Subjects
Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Cosmic ray, Nuclear physics, Neutrino detector, Observatory, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino astronomy, Neutrino, Large Volume Detector, Instrumentation
Abstract

The large-volume detector (LVD) which will be installed in Hall A of the Gran Sasso Laboratory can be defined as an underground observatory devoted to neutrino astronomy and to the measurement of the penetrating components of cosmic rays. The detector consists of two major parts: the tracking system and the scintillator system. It is specifically designed to permit a multipurpose experiment allowing the detection of neutrino interaction inside the detector and the detection of omnidirectional mu-mesons and the measurement of their trajectories and direction of flight.

Published
1989
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114. Search for exotic tau decays

Author

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

Subjects
Physics, Nuclear physics, tau lepton, decays, Crystal Ball, Nuclear and High Energy Physics, Particle physics, Detector, DESY, Storage ring
Abstract

The Crystal Ball detector at the Doris II storage ring at DESY was used to search for the exotic decay processes τ →e γ , τ →e π 0 , and τ →e η . No signal was observed. We obtained the following 90% CL upper limits on the branching fractions: B ( τ →e γ ) −4 , B ( τ →e π 0 ) −4 , B ( τ →e η ) −4 .

Published
1988
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115. Measurements of the Polarization in Proton-Proton Elastic Scattering from 2.50 to 5.15GeVc

Author

D. J. Sherden, J. Scheid, R. J. Esterling, J. Parry, G. Conforto, N. E. Booth, and A. Yokosawa

Subjects
Physics, Nuclear physics, Elastic scattering, Pion, Proton, law, Momentum transfer, Atomic physics, Nuclear Experiment, Polarization (waves), Small-angle neutron scattering, Synchrotron, law.invention
Abstract

In an experiment at the Argonne Zero-Gradient Synchrotron we have measured values of the polarization parameter $P(t)$ in the elastic scattering of negative pions, positive pions, positive kaons, and protons on protons at several incident laboratory momenta from 2.50 to 5.15 $\frac{\mathrm{GeV}}{c}$, and for values of the momentum transfer variable $\ensuremath{-}t$ from 0.2 to 2.0 ${(\frac{\mathrm{GeV}}{c})}^{2}$. The final results from $p\ensuremath{-}p$ elastic scattering presented here extend our knowledge of the polarization to much larger values of $\ensuremath{-}t$ than the results of previous measurements. Outstanding features revealed by these polarization data include (1) the development of a dip at about $\ensuremath{-}t=0.7 {(\frac{\mathrm{GeV}}{c})}^{2}$, with (2) a substantial secondary peak at larger values of $\ensuremath{-}t$ and (3) the gradual diminution of the maximum polarization with increasing energy. It is possible to fit the $t$ dependence of the experimental results with a simple model. The energy dependence of the polarized cross sections is also discussed.

Published
1973
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116. Direct measurement of Μ− mesonic molecule formation rates in liquid hydrogen

Author

S. Focardi, G. Conforto, E. Zavattini, and C. Rubbia

Subjects
Physics, Nuclear and High Energy Physics, Muon, Hydrogen, chemistry.chemical_element, Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, Neon, medicine.anatomical_structure, chemistry, Deuterium, medicine, Molecule, Mesonic molecule, Atomic physics, Nucleus, Liquid hydrogen
Abstract

We describe a measurement of the Μ−pp and Μ−pd mesonic molecule formation rate in liquid hydrogen. We also give the capture probability of Μ− from the neon nucleus. Our results are compared with those obtained by others authors.

Published
1964
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119. Measurements of the Polarization Parameter inπ±pElastic Scattering Between 2.50 and 5.15 GeV/c

Author

J. Parry, R. J. Esterling, D. J. Sherden, G. Conforto, A. Yokosawa, J. Scheid, and N. E. Booth

Subjects
Physics, Elastic scattering, Particle physics, Pion, Scattering, Polarization (waves)
Abstract

The polarization parameter in ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}p$ elastic scattering has been measured at several momenta in the range 2.50-5.15 GeV/c pion laboratory momentum and covering the range in $t$ approximately from -0.2 to -2.0${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$. The data show positive polarization for ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}p$ scattering, having a dip near $t=\ensuremath{-}0.6$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$ and becoming relatively large at greater values of $\ensuremath{-}t$. The results for ${\ensuremath{\pi}}^{+}$ and ${\ensuremath{\pi}}^{\ensuremath{-}}$ scattering are approximately equal in magnitude but of opposite sign. The data have been analyzed to separate the components, which are symmetric and antisymmetric with respect to pion charge, and to show both the $t$ and $s$ dependence of each part.

Published
1973
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120. A measurement of the β-parameter in the charged nonleptonic decay of the Λ0 hyperon

Author

E. Heer, G. von Dardel, C. Revillard, A. Gautschi, W.E. Cleland, G. Conforto, H.J. Gerber, M. Reinharz, and G.H. Eaton

Subjects
Recoil proton, Nuclear physics, Physics, Nuclear and High Energy Physics, media_common.quotation_subject, Hyperon, Polarimeter, Atomic physics, Spark chamber, Polarization (waves), Asymmetry, Liquid hydrogen, media_common
Abstract

We obtain for the β-parameter in the decay Λ0 → π−p the value β = −0.094 ± 0.060. This value agrees with the theoretical prediction based on T-invariance and the |ΔI| = 1 2 rule, taking into account the effects of final state interactions. The Δ0 were produced by 1.03 and 1.06 GeV/cπ− in a liquid hydrogen target, and the polarization of the recoil proton was measured in a carbon-plate spark chamber polarimeter. The triggering conditions were successfully designed to select events of the configuration best adapted to the determination of the β-parameter.

Published
1972
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121. A determination of the β parameter as a test of T-invariance in the charged decay mode of the Λ hyperon

Author

J.Fr. Renevey, J.K. Bienlein, M. Reinharz, A. Gautschi, W.E. Cleland, H.J. Gerber, M. Veltman, G. Conforto, E. Heer, G.H. Eaton, and G. von Dardel

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Pion, Invariance principle, Hyperon, Atomic physics, Polarization (waves)
Abstract

The β parameter of Λ → p + π − have been measured. We obtain β = − 0.13 ± 0.07, in agreement with time reversal invariance. The Λ polarization in π − + p → Λ + K° at 1.03 GeV/ c and 1.06 GeV/ c is also given.

Published
1967
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122. Measurements of the Polarization inπ±pElastic Scattering at 5.15 GeV/c

Author

A. Yokosawa, R. J. Esterling, J. Scheid, N. E. Booth, J. Parry, G. Conforto, and D. Sherden

Subjects
Elastic scattering, Physics, Particle physics, Pion, Amplitude, General Physics and Astronomy, Atomic physics, Polarization (waves)
Abstract

We report results obtained at the zero-gradient synchrotron for the polarization in ${\ensuremath{\pi}}^{+}p$ and ${\ensuremath{\pi}}^{\ensuremath{-}}p$ elastic scattering at 5.15 GeV/c, from $\ensuremath{-}t=0.2\mathrm{to}2.0$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$. The results may be qualitatively understood on the basis of a simple Regge-pole model. In addition to the flip amplitude due to $\ensuremath{\rho}$ exchange, a significant $I=0$ flip amplitude is required.

Published
1968
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123. RatioC A /C V and time reversal invariance in neutron beta decay

Author

G. Conforto

Subjects
Physics, Nuclear and High Energy Physics, Lorentz transformation, media_common.quotation_subject, Hadron, Value (computer science), Beta decay, Asymmetry, Nuclear physics, symbols.namesake, Theory of relativity, symbols, Neutron, media_common
Abstract

The existing data on the asymmetry coefficients of the various correlations in the beta decay of free neutrons are applied to determine theA/V ratio and the relative phaseA, V. It is shown that by using the above data the error of the generally acceptedA, V value can be decreased by 25%.

Published
1967
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124. Sunti delle comunicazioni presentate al XLVII Congresso della società

Author

E. Abate, G. Bellini, E. Fiorini, S. Ratti, N. Abbattista, A. Minafra, S. Mongelli, A. Romano, P. Waloschek, M. Ageno, C. Felici, A. Agodi, R. Giordano, J. Alitti, V. Alles-Borelli, J. P. Baton, A. Berthelot, U. Bidan, A. Daudin, B. Deler, O. Goussu, M. A. Jabiol, F. Lévy, C. Lewin, M. Neveu-René, A. Rogozinski, F. Shively, J. Laberrigue-Frolow, O. Ouannès, M. Sené, L. Vigneron, E. Benedetti, J. Litvak, G. Puppi, M. Whitehead, J. E. Allen, C. Bartoli, B. Brunelli, J. A. Nation, B. Rumi, R. Toschi, A. Boschi, F. Magistrelli, J. B. Allen, C. Coville, M. U. Martone, S. E. Segre, U. Amaldi, V. T. Cocconi, T. Fazzini, G. Fidecaro, C. Gesquière, M. Legros, H. Steiner, G. Andreassi, P. Budini, G. Calucci, G. Furlan, G. Peressutti, P. Cazzola, I. Archetti, D. Steve Bocciarelli, P. E. Argan, G. Bendiscioli, G. Ciocchetti, I. Ferrero, A. Gigli, A. Piazzoli, E. Picasso, G. Piragino, G. Ascarelli, S. Rodriguez, A. Ascenzi, E. Bonucci, C. François, A. Ascoli, Z. A. Fuhrman, U. Ascoli-Bartoli, A. De Angelis, S. Martellucci, M. Asdente, J. Friedel, B. Aubert, V. Brisson, J. Hennessy, P. Mittner, J. Six, C. Baglin, M. Bloch, A. Bressy, A. Lagarrigue, A. Orkin-Lecourtois, P. Rançon, A. Rousset, X. Sauteron, P. L. Auer, S. Aurisicchio, C. Frontali, F. Graziosi, G. Toschi, F. Bachelet, P. Balata, N. Lucci, F. Baldassarre, A. Caforio, A. Ferilli, D. Ferraro, M. Merlin, S. Semeraro, C. M. Fisher, W. M. Gibson, A. Mason, W. Venus, D. Evans, A. Hossain, W. O. Lock, M. F. Votruba, A. Wataghin, M. M. Kasim, M. A. Shaukat, A. Fedrighini, A. J. Herz, A. E. Sichirollo, L. Tallone, G. Vegni, A. Balzarotti, G. Chiarotti, A. Frova, F. Baracchi, R. Perilli-Fedeli, M. Pierucci, G. Saltini, G. Barbiellini, G. Bologna, G. Diambrini, G. P. Murtas, A. Barone, G. Baroni, R. Bizzarri, P. Guidoni, A. Manfredini, A. Stajano, G. Brautti, M. Ceschia, L. Chersovani, M. Sessa, M. Bassetti, A. Pompei, P. Bassi, G. Bertolini, F. Cappellani, B. Ferretti, G. B. Restelli, A. Rota, G. Venturini, A. Battaglia, M. Iannuzzi, E. Polacco, G. Degli Antoni, P. Negri, W. B. Fretter, T. F. Hoang, H. Bingham, D. Drijard, B. De Raad, R. Salmeron, R. Voss, M. Cresti, S. Limentani, R. Santangelo, G. Boreani, I. Perrero, C. M. Garelli, A. Lagar-Rigue, E. G. Beltrametti, M. Beltrami, M. Colombo, R. Fieschi, K. Berkelman, G. Cortellessa, A. Reale, A. Bernè, G. Boato, M. De Paz, M. Bertolotti, V. Grasso, T. Papa, D. Sette, C. Bertoluzza, A. Bisi, A. Fasana, E. Gatti, L. Zappa, G. Casanova, A. C. Levi, G. Bonazzola, O. A. Borello, S. Costa, S. Ferroni, G. Bonera, F. Borsa, P. De Stefano, A. Rigamionti, A. Rigamonti, P. G. Bordoni, P. E. Giua, L. Palmieri, M. Verani-Borgucci, M. Nuovo, L. Verdini, F. Ferrero, R. Malvano, A. Molinari, G. Borgonovi, G. Caglioti, F. P. Ricci, A. Santoro, V. Scatturin, M. V. Bortolani, L. Lendinara, L. Monari, A. Braccesi, M. Ceccarelli, T. Weber, G. Buttino, A. Cecchetti, A. Drigo, E. R. Caianiello, M. Marinaro, B. Preziosi, P. Caldirola, O. De Baebieri, G. Calvi, R. Parisi, A. Rubbino, P. Camagni, A. Manara, A. Caimpolattaro, G. Campos Venuti, G. Matthiae, E. Canobbio, R. Cappelletti, L. Dalla Croce, G. Careri, S. Cunsolo, P. Mazzoldi, N. Carrara, P. F. Checcacci, L. Ronchi, R. Carrara, A. Grigoletto, A. Loria, L. Peruzzo, D. Venchiarutti, A. Carrelli, E. Grossetti, L. Pauciulo, A. Carreli, E. Tartaglione, G. Brescia, F. Porreca, F. Cattaneo, E. Germagnoli, A. Cavaliere, S. Cavallaro, R. Potenza, R. Ricamo, G. Cavalleri, G. Redaelli, R. Giovanellt, S. Ceresara, T. Federigih, C. Cernigoi, I. Gabrielli, G. Iernetti, C. Villi, C. B. Chadwick, W. T. Davies, M. Derrick, J. H. Mulvey, D. Radojicic, C. A. Wilkinson, G. Nardelli, A. Chiozzotto, F. Valente, N. H. Lipman, A. W. Merrison, L. Colli, G. Bassani, P. G. Sona, F. Cristofori, M. O. Franceschetti, I. Iori, G. Krzuk, M. Mangialajo, F. Marcelja, F. Merzari, G. Conforto, M. Conversi, L. Di Lella, G. Penso, M. Toller, C. Rubbia, L. di Lella, G. Contursi, A. Pozzi, P. Salvadori, E. Crosignani, P. Franzosini, G. Siragusa, L. Zanotti, M. Cutolo, P. Cuzzocrea, R. A. Ricci, G. B. Vingiani, G. Da Prato, G. B. Debiasi, G. Rostagni, H. De Carvalho, A. Celano, G. Cortini, E. Del Giudice, G. Potenza, R. Rinzivillo, G. Ghigo, H. G. de Carvalho, M. Muchnik, M. Severi, J. Combe, K. Goebel, A. Manfeedini, G. Vanderhaeghe, R. Bösch, J. Lang, R. Müller, W. Wölfli, H. G. de Carvaiho, F. Salvetti, E. Sassi, G. Boella, C. Cantù, F. Della Valle, L. Frontali, P. Orlando, G. Tecce, S. Delli Santi, G. Mannino, G. Setti, F. Demanins, G. Pisent, G. Poiani, F. De Martini, A. Desalvo, P. Gondi, F. A. Levi, F. Zignani, B. De Tollis, A. Verganelakis, M. Di Corato, E. S. Geisema, A. Minguzzi-Ranzi, J. Belltère, H. H. Bingham, M. Garelli, M. Vigone, P. Waldner, B. de Raad, V. Emma, C. Milone, S. Iannelli, F. Mezzanares, E. Erra, E. Saetta Menichella, U. Facchini, F. Erdas, G. von Gehlen, G. Fabri, F. Fabiani, M. Fidecaro, G. Finocchiaro, G. Giacomelli, D. Harting, G. Torelli, G. Gatti, W. C. Middelkoop, T. Yamagata, G. Spinolo, L. Freindl, H. Niewodniczański, J. Nurzyński, M. Slapa, A. Strzalkowski, M. T. Mangiantini, E. Galzenati, M. Pusterla, F. Gasparini, V. Svelto, C. Tamburello, D. Gellt, D. Gelli, T. Federighi, A. Grilli, D. Noblli, G. W. Greenlees, K. A. Grotowski, A. B. Robbins, M. Grimaldi, F. M. Votruba, P. Principi, T. Rossini, J. G. Linhart, H. Knoepfel, C. Gourlan, R. S. Liotta, A. Luccio, G. Pavanati, F. Resmini, C. Rosatelli, C. Succi, G. Tagliaferri, F. Resmimi, Ch. Maisonnier, M. Haegi, M. Omini, M. G. Marcazzan, F. Tonolini, G. Martelli, K. Chapman, W. Galbraith, H. B. van der Raay, D. H. Reading, R. Rubinstein, G. Marx, G. Missiroli, U. Valdrè, G. Missoni, J. W. Motz, D. Monti, G. Quareni, A. Quareni Vignudelli, K. Gottntein, W. Püschel, J. Tietge, R. Morchio, A. Borsellino, S. Notarrigo, M. Paić, B. Antolković, P. Tomaš, M. Turk, A. Paoletti, G. Pappalardo, D. Vinciguerra, V. Pelosi, G. Tomasini, G. Dascola, A. Gainotti, C. Lamborizio, R. Pratesi, A. M. Scheggi, G. Toraldo di Francia, T. F. Quercia, E. Turrisi, M. Jean, R. Van Lieshout, S. Monaro, G. Chilosi, B. Van Nooyen, A. Sargentini, F. Sgarlata, F. Wanderlingh, J. P. Somon, F. Waldner, G. Zin, and F. Vinci

Subjects
Nuclear and High Energy Physics, Materials science, Astronomy and Astrophysics, Humanities, Atomic and Molecular Physics, and Optics
Published
1962
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125. Review of Particle Properties

Author

G. Conforto, Arthur H. Rosenfeld, P. Soding, Matts Roos, LeRoy R. Price, Angela Barbaro-Galtieri, Charles G Wohl, and Naomi Barash-Schmidt

Subjects
Nuclear physics, Physics, Particle properties, General Physics and Astronomy
Published
1969
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126. π±−p Elastic scattering on polarized protons at large momentum transfers

Author

G. Conforto

Subjects
Elastic scattering, Physics, Nuclear physics, Nuclear and High Energy Physics, Pion, Hadron, Elementary particle, Atomic physics, Polarization (waves), Phenomenology (particle physics)
Abstract

Recent results of the measurements of π±−p elastic scattering on polarized protons at large momentum transfers are reported and compared with Regge pole phenomenology.

Published
1969
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127. Search for neutrinoless coherent nuclear capture of μ -mesons

Author

G. Conforto, M. Toller, L. Di Lella, C. Rubbia, M. Conversi, and G. Penso

Subjects
Physics, Nuclear and High Energy Physics, Large Hadron Collider, Muon, Meson, Physics::Instrumentation and Detectors, Branching fraction, Astronomy and Astrophysics, Electron, Atomic and Molecular Physics, and Optics, Nuclear physics, Physics::Accelerator Physics, High Energy Physics::Experiment, Spark chamber, Neutrino, Oscilloscope
Abstract

A high sensitivity experiment to search for the neutrinoless conversion of a muon into an electron {ie261-01}, where {ie261-02} is a Cu nucleus) has been carried out at the CERN Synchro-cyclotron. The space correlation between the muon and the electron was « seen » in a spark chamber operated as a target in the muon beam. The time correlation was observed on an oscilloscope trace which also contained the pulse from a large NaI(Tl) crystal, used to measure the energy of the electron (103.8 MeV in the case of the above mentioned process occurring coherently in the Cu plates of the chamber). Nearly 2.4 billion μ−-mesons were stopped during the main run. From the scanning of the film of the chamber (two 90° stereo-views) and of the corresponding oscilloscope pictures obtained in this run, four events have been found fulfilling all requirements of time correlation, space correlation and correct energyrelease in the Nal counter. It is shown, however, that ∼5±2 is the expected number of events of spurious nature. Hence, if the neutrinoless coherent nuclear capture of a meson exists at all, its branching ratio to the ordinary capture is concluded to be less than 2.2 .10−7 with 90% confidence level. This negative result fits into the recent discovery of two kinds of neutrinos.

Published
1962
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129. An automatic device for the analysis of spark chamber pictures

Author

B. Smith, I.M. Blair, E. Zavattini, G. Conforto, and C. Rubbia

Subjects
Physics, Scanner, Optics, Simple (abstract algebra), business.industry, Instrumentation, ComputerApplications_COMPUTERSINOTHERSYSTEMS, General Medicine, Line (text file), Spark chamber, business, GeneralLiterature_MISCELLANEOUS
Abstract

We describe an automatic film scanner, intended for relatively simple spark chamber photos. It can operate either on line with a computer or separately. Results of some measurements made are given.

Published
1964
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130. IsCPviolation time dependent?

Author

G. Conforto and N. Cabibbo

Subjects
Physics, Particle decay, Particle physics, Pair production, Pion, Meson, Bar (music), Hadron, CP violation, Elementary particle
Abstract

The possibility that the discrepancy between the pre-1971 and post-1971 measurements of the CP-violating parameter Vertical Bareta/sub +/-Vertical Bar is a real effect is considered. The implications in the framework of various theoretical models are discussed.

Published
1982
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131. Direct Measurement ofμ−-Mesonic Molecule Formation Rates in Liquid Hydrogen

Author

E. Zavattini, G. Conforto, S. Focardi, and C. Rubbia

Subjects
Physics, Muon, Hydrogen, Astrophysics::High Energy Astrophysical Phenomena, Analytical chemistry, Gamma ray, General Physics and Astronomy, chemistry.chemical_element, Neon, Deuterium, chemistry, Excited state, Molecule, Mesonic molecule, Atomic physics, Nuclear Experiment
Abstract

Experimental evidence is presented for 2p--1s transition mesonic x rays of 214-kev from (1) ( mu ,p) + Ne yields ( mu ,Ne) + p and (2) ( mu ,d) + Ne mu ( mu ,Ne) + d reactions obtained by dissolving neon in deuterium-free hydrogen and deuteriumhydrogen mixtures, respectively. The results indicate that reaction (1), leading to excited states, is compatible with l00% of the cases, The time distribution of these gamma rays Makes possible a direct measurement of the speed of (p mu p) and (p mu d) molecule formation. Rates of mesonic- molecule formation and 2p--1s transition mesonic x-ray yields are tabulated and time distributions of mu - transfer fractions are shown. (H.D.R.)

Published
1962
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133. Missing mass analysis of the A−2 at 6.0 GeV/c

Author

M. S. Witherell, R. M. Mobley, A.W. Key, M. A. Kramer, D. Underwood, G. Conforto, R. Prepost, and D. H. Tompkins

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Dipole, Mass spectrum, Atomic physics, Spark chamber, Mass analysis
Abstract

The missing mass spectrum in the region of the A − 2 has been measured in the reaction π − p→X − p at 6.0 GeV/ c in the interval 0.27 t | c ) 2 , with an optical spark chamber system which simultaneously observed the decay X − → ηπ − . A signal of 230 events above background per five MeV interval is observed at the A 2 peak, with a signal-to-background ratio of greater than 1:1. A single D-wave Breit-Wigner distribution with a quadratic background gives a good fit to the data, yielding the parameters M 0 =(1.324±0.003) GeV/ c 2 and Γ 0 =(0.104±0.009) GeV/ c 2 . The spectrum is incompatible with a dipole shape.

Published
1973
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134. Prompt neutrino production in a proton beam-dump experiment

Author

F. Ranjard, T. Ruan, A. Savoy-Navarro, C. Geweniger, D. Schlatter, R. Turlay, H. J. Willutzki, H. D. Wahl, J. Knobloch, H. Lierl, V. Hepp, W. von Rüden, F. Eisele, B. Pszola, B. Peyaud, H. Taureg, F. Dydak, S. Loucatos, Joseph Rothberg, Halina Abramowicz, Jp Schuller, Claude Guyot, P. Bloch, J. De Groot, Konrad Kleinknecht, P. Palazzi, T. Flottmann, John Rander, G. Conforto, Jean-Pierre Merlo, H. P. Klasen, J. May, J. He, W. Wu, J. Steinberger, K. Tittel, A. Para, J. Królikowski, Jorg Wotschack, and B. Renk

Subjects
Semileptonic decay, Physics, Particle physics, Physics and Astronomy (miscellaneous), Proton, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Hadron, Electron, law.invention, Baryon, Charmed baryons, Nuclear physics, law, High Energy Physics::Experiment, Beam dump, Neutrino, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

In the interactions of 400 GeV/c protons with copper nuclei, a flux of prompt neutrinos is observed. The reactions produced by these neutrinos in our apparatus appear consistent with those of electron- and muon-neutrinos. The prompt neutrino fluxes are interpreted as being due to associated production and subsequent semileptonic decay of charmed hadrons. The prompt flux ratio $$\bar v_\mu /v_\mu = 0.46_{ - 0.16}^{ + 0.21} $$ suggests a sizeable production of charmed baryons near the forward direction. The ratio of prompte −+e + toµ −+µ + event rates is 0.64 −0.15 +0.22 , where unity is expected frome-μ universality.

Published
1982

135. The Relevance of the Fermilab Neutrino Beam Dump Experiment, E613, to Neutrino Oscillations

Author

H. R. Gustafson, M. E. Duffy, S. Childress, G. K. Fanourakis, D.D. Reeder, J. S. Hoftun, C. T. Coffin, R. Loveless, E. Wang, E. S. Smith, D. L. Schumann, B. P. Roe, J. Volk, L. W. Jones, A. Raspini, T. J. Roberts, M. J. Longo, T. A. Romanowski, G. Conforto, M. B. Crisler, R. C. Ball, and T. Y. Ling

Subjects
Physics, Particle physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, Solar neutrino problem, law.invention, Nuclear physics, Neutrino detector, law, Physics::Accelerator Physics, Measurements of neutrino speed, High Energy Physics::Experiment, Fermilab, Beam dump, Neutrino, Neutrino oscillation
Abstract

A beam dump experiment has been set up at Fermilab to study prompt neutrino production by 400 GeV protons. It is unusual among experiments seeking evidence for neutrino oscillations in that the neutrino path length is short, only 60 m, while the neutrino energies are high, 10 to 200 GeV. The experiment, expected to take data this spring, will be sensitive to oscillations ν e → ν x for values of ∆m2 between 200 and 10,000 (eV)2 and sin2 2α > 0.2.

Published
1981
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136. Prompt Neutrino Results from Fermi Lab

Author

J. Volk, G. K. Fanourakis, G. Conforto, M. B. Crisler, D. D. Reeder, T. J. Roberts, L. W. Jones, Richard Loveless, R. C. Ball, Michael J. Longo, E. Wang, D. L. Schunann, C. Castoldi, Byron P. Roe, T. A. Romanowski, J. S. Hoftun, E. S. Smith, H. R. Gustafson, C. T. Coffin, Ta-Yung Ling, S. Childress, and M. E. Duffy

Subjects
Physics, Particle physics, Meson, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Hadron, Elementary particle, Nuclear physics, Massless particle, Particle decay, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Nucleon, Lepton
Abstract

Results from a Fermi lab experiment to study prompt neutrino production are presented. Assuming the prompt neutrinos come from the decay of charmed mesons we find a total DD production cross section of approx. 20 μb/nucleon, in good agreement with previous CERN results. We find a ν/ν ratio and a νe/νμ of approx. 1.0. The energy and pT spectra of the prompt neutrinos are consistent with those expected from DD production. Limits on the production of supersymmetric particles have also been obtained.

Published
1983
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137. Prompt Neutrino Production by 400 GeV Proton Interactions

Author

R. C. Ball, C. Castoldi, S. Childress, C. T. Coffin, G. Conforto, M. B. Crisler, M. E. Duffy, G. K. Fanourakis, H. R. Gustafson, J. S. Hoftun, L. W. Jones, T. Y. Ling, M. J. Longo, R. J. Loveless, D. D. Reeder, T. J. Roberts, B. P. Roe, T. A. Romanowski, D. L. Schumann, E. S. Smith, J. T. Volk, E. Wang, Hugh C. Wolfe, R. S. Panvini, M. S. Alam, and S. E. Csorna

Subjects
Nuclear physics, Nuclear reaction, Physics, Particle physics, Muon, Proton, Meson, Hadron, Fermilab, Neutrino, Lepton
Abstract

A sample of 830 neutrino induced lμ events and 752 muonless events recorded in a prompt neutrino experiment at Fermilab was analyzed to yield the following results: i) 0.65 ± 0.30 for the ratio of prompt νμ to νμ flux, ii) 1.0 ± 0.3 for the ratio of prompt νe to νμ flux for Ev > 30 GeV and iii) inclusive DD production cross section σDD¯ = 16 ± 3 (Stat.) ± 3 (Sys) μb per nucleon assuming σDD to be proportional to (1−XF)3 e−2P⊥ and A1 dependence.

Published
1982
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138. Results from a Fermilab neutrino beam dump experiment

Author

M. B. Crisler, C. T. Coffin, D. L. Schumann, Ta-Yung Ling, J. Volk, Byron P. Roe, Richard Loveless, E. S. Smith, C. Castoldi, L. W. Jones, E. Wang, Michael J. Longo, R. C. Ball, S. Childress, D. D. Reeder, T. J. Roberts, T. A. Romanowski, G. K. Fanourakis, M. E. Duffy, J. S. Hoftun, H. R. Gustafson, and G. Conforto

Subjects
Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, High Energy Physics::Phenomenology, Solar neutrino problem, law.invention, Massless particle, Nuclear physics, law, High Energy Physics::Experiment, Fermilab, Beam dump, Neutrino, Lepton
Abstract

The flux of prompt neutrinos from a beam dump has been measured in an experiment at the Fermi National Accelerator Laboratory (E613). Assuming that the charm production has a linear dependence on atomic number and varies as (1−‖×‖)5 e−2mT, a model dependent cross section of 27±5μb/nucleon can be derived. For neutrino energies greater than 20 GeV, the flux of electron neutrinos with respect to muon neutrinos is 0.78±0.19. For neutrinos with energy greater than 30 GeV and p⊥ greater than 0.2, the flux of νu compared to νμ is 0.96±0.22.

Published
1983
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139. A dependence of charm production

Author

Michael J. Longo, S. Childress, D. D. Reeder, J. S. Hoftun, C. T. Coffin, Ta-Yung Ling, Byron P. Roe, E. Wang, G. Conforto, T. J. Roberts, H. R. Gustafson, C. Castoldi, E. S. Smith, M. E. Duffy, Lawrence W. Jones, T. A. Romanowski, Richard Loveless, G. K. Fanourakis, J. Volk, M. B. Crisler, and R. C. Ball

Subjects
Physics, Particle physics, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, General Physics and Astronomy, Nuclear physics, Physics::Accelerator Physics, High Energy Physics::Experiment, Production (computer science), Charm (quantum number), Fermilab, Neutrino, Nuclear Experiment, Energy (signal processing)
Abstract

The prompt neutrino (${\ensuremath{\nu}}_{e}+{\overline{\ensuremath{\nu}}}_{e}$) flux produced by the interaction of 400-GeV protons with targets of beryllium, copper, and tungsten has been measured in a beam-dump experiment at Fermilab. With the assumption that these neutrinos arise from charm decay, the cross section for charm production by protons on nuclei varies as ${A}^{\ensuremath{\alpha}}$, where $\ensuremath{\alpha}=0.75\ifmmode\pm\else\textpm\fi{}0.05$. No significant variation of $\ensuremath{\alpha}$ with neutrino energy is observed.

Published
1985

141. Search For Radiative Y(1s) Decays Into Light Mesons

Author

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

Subjects
Physics, Annihilation, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Hadron, Upsilon(1S), radiative decays, Crystal Ball, Elementary particle, Quarkonium, Nuclear physics, Particle decay, Pion, High Energy Physics::Experiment, Engineering (miscellaneous)
Abstract

We have searched for radiative decays of the ϒ(1S) resonance, ϒ(1S)→γX, whereX is one of the mesons η, η′f2 (1270),f2 (1720), or a narrow resonance with mass less than 3 GeV/c2 which decays into either π0π0 or ηη. The mesons are identified in their all-neutral decay modes. Since we do not find any such decays, we calculate upper limits on the corresponding branching ratios. These limits are compared to theoretical predictions and to the corresponding branching ratios measured in radiativeJ/Ψ decays.

Published
1988

142. Characteristics of charm production by 400-GeV protons

Author

G. Conforto, E. Wang, C. T. Coffin, J. S. Hoftun, C. Castoldi, T. Y. Ling, M. B. Crisler, G. K. Fanourakis, J. Volk, S. Childress, M. E. Duffy, M. J. Longo, T. A. Romanowski, D.D. Reeder, T. J. Roberts, Lawrence W. Jones, E. S. Smith, H. R. Gustafson, R. C. Ball, R. Loveless, and B. P. Roe

Subjects
Nuclear reaction, Nuclear physics, Semileptonic decay, Physics, Particle physics, Particle decay, Meson, Branching fraction, Hadron, General Physics and Astronomy, High Energy Physics::Experiment, Nucleon, Lepton
Abstract

In a beam-dump experiment at Fermilab the cross section for charm-particle production has been deduced from a measurement of the prompt neutrino flux. The reaction cross section, if we assume only DD-bar and the dependence on atomic weight A/sup 0.75/, is 57.2 +- 2.9 +- 8.5 ..mu..b/nucleon and the dependence on Feynman x and transverse momentum is E/sub D/ d/sup 3/sigma/sub pD//sup 3/proportional(1-x)/sup 3.2/e/sup -1/ .5p/sub perpendicular/ (p/sub perpendicular/ in GeV/c). The data are consistent with as much as 40% diffractive production of ..lambda../sub c/D-bar.

Published
1986

143. Results from Beam Dump Experiments at Cern

Author

G. Conforto

Subjects
Physics, Large Hadron Collider, Proton, Hadron, law.invention, Nuclear physics, Acceleration, law, Computer Science::Programming Languages, Physics::Accelerator Physics, Muon neutrino, Beam dump, Nuclear Experiment, Electron neutrino, Beam (structure)
Abstract

Beam dump experiments are performed by letting the extracted proton beam from an acceleration interact in a dense target, the “dump”, large enough to entirely absorb hadronic cascades produced by primary interactions.

Published
1981
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144. Evidence for prompt neutrinos and interpretation of beam dump experiments

Author

G. Conforto

Subjects
Physics, Massless particle, Nuclear physics, Particle decay, Particle physics, Muon, law, Particle accelerator, Fermion, Beam dump, Neutrino, Particle identification, law.invention
Abstract

The results of the various beam dump experiments performed so far are reviewed. Their implications for the charmed particle lifetime are also presented and discussed.

Published
1979
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145. Observation and study of the nu$_{mu}$e- --> nu$_{mu}$e- reaction in Gargamelle at high energy

Author

D. Blum, J. Sleeman, C. Matteuzzi, F. Romano, Salvatore Nuzzo, N. Armenise, L. Zanotti, Donatella Cavalli, M. Rollier, M. Haguenauer, P. Lundborg, J. Bourotte, P. Alibran, Ph. Heusse, E. Bellotti, B. Pattison, M.T. Fogli-Muciaccia, B. Degrange, S. Natali, O. Erriquez, F. Jacquet, A. Pullia, U. Nguyen-Khac, A.M. Lutz, G. Bonneaud, P. Musset, E. Fiorini, G. Conforto, C. Pascaud, J. Gillespie, J.P. Vialle, G. Carnesecchi, M. Willutzky, S. Bonetti, and A. Blondel

Subjects
Physics, Nuclear physics, Elastic scattering, Coupling constant, Nuclear and High Energy Physics, Gargamelle, Bubble chamber, Elementary particle, Neutrino, Nuclear Experiment, Pseudovector, Particle Physics - Experiment, Lepton
Abstract

A search for the reaction nu /sub mu /+e/sup -/ to nu /sub mu /+e/sup -/ was made in the bubble chamber Gargamelle exposed to the wide- and neutrino beam of the CERN-SPS. Ten isolated e/sup -/ were found above 2 GeV energy. All of them were emitted at an angle smaller than 1.5 degrees with respect to the beam. The background is 0.2+or-0.2 events. Results on cross section are given in terms of vector and axial vector coupling constants. A comparison is made with the standard SU(2)(X)U (1) model: no agreement is found with the currently accepted value of the mixing angle. Possible sources other than the above reaction are discussed. (10 refs).

Published
1978

146. [Synthesis and anti-ulcer activity of 3-arylprop-2-enthionoethyl esters]

Author

F, Guerrera, M C, Sarvà, M A, Siracusa, G, Ronsisvalle, G, Conforto, S, Dibennardo, G, Failla, and M, Matera

Subjects
Male, Chemistry, Acrylates, Chemical Phenomena, Animals, Thiones, Rats, Inbred Strains, Stomach Ulcer, Anti-Ulcer Agents, Rats
Abstract

A series of 3-arylprop-2-enthionoester derivatives was synthesized. These compounds were evaluated for their antiulcer activity. Derivatives [(H), (V), (VIII)] showed a noteworthy activity.

Published
1988

147. Search for the neutral Higgs boson from $Z^{0}$ decay

Author

Yu. Galaktionov, Dimitri Bourilkov, J. Alcaraz, T. Kramer, Marco Meschini, J. J. Blaising, R. Rosmalen, B. N. Jin, M. MacDermott, G. Sauvage, R. L. Summer, H. Haan, Mariagrazia Alviggi, M. A. Niaz, L. Baksay, A. Arefiev, L. Zehnder, I. Vetlitsky, Cheng Chen, B. Stöhr, T. Foreman, Aa Vorobyov, S. Banerjee, Harvey B Newman, V.G. Shevchenko, P. Extermann, K. Hilgers, B. Borgia, A. van Laak, I. Leedom, C. Zaccardelli, J. Martin, Boleslaw Wyslouch, C.Y. Chien, H. Hofer, K. L. Tung, Y.J. Pei, B. Bertucci, D. Zhang, J. Ulbricht, X.R. Shi, I. Clare, J. Busenitz, L. Urbàn, D.N. Mao, C. Souyri, P. Göttlicher, Lamberto Luminari, M. Gailloud, J. M. Salicio, U. Micke, J.C. Sens, R. Raghavan, M. Möller, Nicanor Colino, J. Fehlmann, W. Lange, R. Weill, D. Linnhofer, Federico Carminati, Tariq Aziz, Y.P. Tong, Laurent Vuilleumier, E. Isiksal, H. F. Chen, Z.P. Zhang, Pierre Lecomte, G. Sartorelli, M. J. Glaubman, S. Rosier-Lees, A. Heavey, P. Le Coultre, Qiang Li, R. Dolin, K. N. Qureshi, P. McBride, Petr Levchenko, S. Röhner, R.C. Ball, Adrian Biland, J. Berdugo, G. H. Wang, Charles Timmermans, K. Hangarter, A. Malinin, Raffaello D'Alessandro, X.L. Wang, C. Grinnell, A. L. Anderson, S. Beingessner, P.G. Seiler, Ying Wu, J. F. Zhou, Crisostomo Sciacca, Yu. Kamyshkov, Marco Pieri, Mw Gruenewald, K.D. Shmakov, S. J. Fan, C.R. Wang, C. Rippich, J. Wenninger, V. Pojidaev, S. Patricelli, R. Starosta, D. Antreasyan, C. Zabounidis, U. Herten, D. Kaplan, Leonardo Merola, D. Luckey, Gy L. Bencze, Reinhard W. Schulte, F. Diez-Hedo, W. Walk, Valery Schegelsky, Antonino Zichichi, J. Mnich, F. Wittgenstein, J.M. Lubbers, H. Rykaczewski, P. Arce, L. Ludovici, Peter Denes, C. G. Yang, G. Mirabelli, G. Chiefari, S. Shevchenko, E. Drago, Nikita Smirnov, S. Schulte, A. Engler, Konrad Deiters, Q. Ye, L. Niessen, Egidio Longo, C. Spartiotis, B. Monteleoni, T. Riemann, T. Azemoon, Z.F. Gong, R.J. Wu, M. Fukushima, B.Z. Yang, D. Goujon, K. Lübelsmeyer, Piero Spillantini, E. G. Thomas, Paolo Bagnaia, Alberto Aloisio, P. Duinker, Jd Burger, M. Capell, W. Kittel, H. Vogt, A. Grimes, F. Marzano, W. Krenz, C. Li, K. S. Kumar, R. Malik, Speranza Falciano, D. Perret-Gallix, H. S. Fesefeldt, W. Ruckstuhl, Th. Meinholz, J.P. Burq, Vincenzo Innocente, R. Morand, Z. L. Xue, R. Bizzarri, S. Hancke, Marcos Cerrada, Sau Lan Wu, Ian Brock, F. DeNotaristefani, Y. Karyotakis, T. Driever, D. P. Stickland, G. J. Bobbink, M. M. Ilyas, J. Bao, H.J. Schreiber, Howard A. Stone, T.S. Dai, X. W. Tang, I. Sheer, J.M. Qian, R. Fabbretti, P. A. Piroué, Philip Kaaret, Axel König, L. Leistam, Y. Mi, U. Becker, F. Tonisch, Q. Fan, Y. Mir, C. H. Ye, Yanwen Liu, J. M. Le Goff, G. Schwering, M. Schneegans, D. Pandoulas, T. McMahon, T. Spickermann, S. Kwan, Bernard Ille, Sc Yeh, G. Fernandez, H. El Mamouni, L. Montanet, F. J. Eppling, M. Harris, J. Fay, Zhuoxiang Ren, A. Sopczak, M. Wadhwa, X. Leytens, R. Magahiz, J. M. You, D. S. Yan, S. X. Wu, P. Berges, Mingshui Chen, J. A. Rubio, M. Maire, J. D. Swain, N. Produit, L. Antonov, M. Bourquin, K. Strauch, Hafeez R. Hoorani, B. L. Betev, M. Fabre, S. M. Ting, W.D. Nowak, T.J. Wenaus, Manjit Kaur, D. DiBitonto, Ph. Rosselet, Thomas Ferguson, An.A. Vorobyov, T. Matsuda, W. Lohmann, J. Krizmanic, G. A. Yang, M. Steuer, M. Dhina, D. Boutigny, A. A. Syed, H. Anderhub, Georgi Sultanov, G. Morand, G. Forconi, J. Weber, A. Marchionni, C. Dionisi, R. W. Kraemer, V.R. Krastev, O. Adriani, A. Böhm, H. Nowak, E. Gonzalez, Suresh C Tonwar, B.C. Stringfellow, D. J. Schotanus, G. Coignet, R. A. Khan, F. Crijns, V. P. Andreev, G.B. Mills, Pablo Garcia-Abia, S. Lanzano, Bernardo Adeva, Alain Hervé, Kajari Mazumdar, S. Khokhar, Samuel C.C. Ting, J.M. Thenard, A.M. Cartacci, H. Akbari, H.R. Dimitrov, P.H. Fisher, C. Civinni, M. Sachwitz, G. Finocchiaro, A. Bay, L. Li, G. M. Chen, Steven Goldfarb, D. Duchesneau, Xd Cai, Marcel Merk, R.B. Sutton, F. Cesaroni, J. Y. Liao, G. Rahal-Callot, J. Perrier, D. Ren, J.F. Li, H. Suter, D.H. Zhang, Y.F. Wang, G. Landi, M. Maolinbay, J. Schütte, Richard Mount, X.G. Li, M. Aguilar-Benitez, I. Duran, Valentin V. Khoze, K. Schultze, E. Tarkovsky, F. Bruyant, V. Morgunov, Herwig Schopper, M. White, D. Lanske, Luciano Romero, Qian Wang, E. Dénes, U. Vikas, R. Sehgal, A. Contin, Alexander Savin, B. P. Roe, R. de Asmundis, P. Vikas, M. Vollmar, E. Nagy, M. Vivargent, Christine Buisson, M. Guanziroli, C. F. He, Z. M. Wang, D. Wright, Giorgio Gratta, A. Pevsner, E. Shumilov, J. Zoll, J. H. Field, M. Schöntag, J. Behrens, P. J. Li, K. Sudhakar, P. Lebrun, Fridolin Dittus, Barry Blumenfeld, S.Y. Zhang, W. Böhlen, V. Shoutko, Wesley James Metzger, J.H. Wang, P. K. Malhotra, U. Uwer, H. A. Rizvi, A. Kunin, H. van der Graaf, A. Chen, L.S. Hsu, J. Salicio, M. Tonutti, R. Leiste, Igor Vorobiev, Ren-Yuan Zhu, Luciano Barone, Jozsef Toth, J. Lettry, Claudio Luci, M. Hebert, Panos A Razis, P. Blömeke, Elisabetta Gallo, F.C. Erné, Q.Y. Yang, A. Gordeev, M. Micke, G.G.G. Massaro, G. Paternoster, D.W. Schmitz, F. Carbonara, A. Gurtu, S. Reucroft, Z.Q. Yang, Robert Clare, A. Leike, H. Fenker, L. Martinez, W.G. Ma, F. L. Linde, Thomas Hebbeker, Paul Lecoq, V. Commichau, M. Napolitano, H. S. Chen, M. Bocciolini, A. Hasan, X. Lue, U. K. Chaturvedi, Y. S. Lu, Jérôme Rose, R. Wilhelm, G. Trowitzsch, Lawrence W. Jones, B. Spiess, P. Marchesini, V. Lalieu, Ming Zeng, M. Röhner, V. Koutsenko, Z.M. Wang, Y.F. Mao, S. Nowak, E. Jagel, W. Wallraff, Guofan Hu, R. T. Van de Walle, Laszlo Gutay, J. G. Branson, Z. W. Yin, S. N. Ganguli, A. Degré, M.L. Chen, M. Gettner, C. Maña, Marcella Diemoz, G. Von Dardel, D. Kirkby, Z.Y. Lin, A. Bujak, Oliver Kornadt, M. Pohl, T. Böhringer, E. Valente, D. McNally, G. Viertel, Hans J. Vogel, S. Morganti, J. Schwenke, X. Y. Cui, M. Chemarin, G. Herten, Y. H. Chang, George Alverson, W. Friebel, G. Faber, Vineet Kumar, Corinne Goy, F. Ferroni, Y. Zeng, A. Kuhn, J. A. Bakken, V. Plyaskin, P. Schmitz, Alexei Klimentov, C. Camps, K. Freudenreich, T. Angelov, K. Lanius, G. Hu, Carlos Willmott, Z.Z. Xu, H. T. Li, R. Liu, S. S. Gau, P.V.K.S. Baba, Qi An, S. Lökös, K.S. Yang, Th. Rombach, Simonetta Gentile, Kenneth Francis Read, G. Conforto, Decamp, D, Deschizeaux, B, Lees, Jp, Minard, Mn, Crespo, Jm, Delfino, M, Fernandez, E, Martinez, M, Miquel, R, Mir, Lm, Orteu, S, Pacheco, A, Perlas, Ja, Tubau, E, Catanesi, Mg, Depalma, M, Farilla, A, Iaselli, G, Maggi, G, Mastrogiacomo, A, Natali, S, Nuzzo, S, Ranieri, A, Raso, G, Romano, F, Ruggieri, F, Selvaggi, G, Silvestris, L, Tempesta, P, Zito, G, Chen, Y, Hu, H, Huang, D, Lin, J, Ruan, T, Wang, T, Wu, W, Xie, Y, Xu, D, Xu, R, Zhang, J, Zhao, W, Albrecht, H, Bird, F, Blucher, E, Charity, T, Drevermann, H, Garrido, L, Grab, C, Hagelberg, R, Haywood, S, Jost, B, Kasemann, M, Kellner, G, Knobloch, J, Lacourt, A, Lehraus, I, Lohse, T, Luke, D, Marchioro, A, Mato, P, May, J, Mertens, V, Minten, A, Miotto, A, Palazzi, P, Pepealtarelli, M, Ranjard, F, Richstein, J, Roth, A, Rothberg, J, Rotscheidt, H, Vonruden, W, Stdenis, R, Schlatter, D, Takashima, M, Talby, M, Taureg, H, Tejessy, W, Wachsmuth, H, Wheeler, S, Wiedenmann, W, Witzeling, W, Wotschack, J, Ajaltouni, Z, Bardadinotwinowska, M, Falvard, A, Gay, P, Henrard, P, Jousset, J, Michel, B, Montret, Jc, Pallin, D, Perret, P, Prat, J, Proriol, J, Prulhiere, F, Bertelsen, H, Hansen, F, Hansen, Jd, Hansen, Jr, Hansen, Ph, Lindahl, A, Madsen, B, Mollerud, R, Nilsson, B, Petersen, G, Simopoulou, E, Vayaki, A, Badier, J, Bernard, D, Blondel, A, Bonneaud, G, Bourotte, J, Braems, F, Brient, Jc, Ciocci, Ma, Fouque, G, Guirlet, R, Mine, P, Rouge, A, Rumpf, M, Videau, H, Videau, I, Zwierski, D, Candlin, Dj, Conti, A, Parrini, G, Corden, M, Georgiopoulos, C, Goldman, Jh, Ikeda, M, Lannutti, J, Levinthal, D, Mermikides, M, Sawyer, L, Antonelli, A, Baldini, R, Bencivenni, G, Bologna, G, Bossi, F, Campana, P, Capon, G, Chiarella, V, Deninno, G, Dettorrepiazzoli, B, Felici, G, Laurelli, P, Mannocchi, G, Murtas, F, Murtas, Gp, Nicoletti, G, Picchi, P, Zografou, P, Altoon, B, Boyle, O, Flavell, Aj, Halley, Aw, Tenhave, I, Hearns, Jl, Hughes, I, Lynch, Jg, Martin, Dj, Oneill, R, Raine, C, Scarr, Jm, Smith, K, Thompson, A, Brandl, B, Braun, O, Geiges, R, Geweniger, C, Hanke, P, Hepp, V, Kluge, Ee, Maumary, Y, Panter, M, Putzer, A, Rensch, B, Stahl, A, Tittel, K, Wunsch, M, Belk, At, Beuselinck, R, Binnie, Dm, Cameron, W, Cattaneo, M, Dornan, Pj, Greene, Am, Dugeay, S, Forty, Rw, Hassard, Jf, Patton, S, Sedgbeer, Jk, Taylor, G, Tomalin, Ir, Wright, Ag, Kneringer, E, Kuhn, D, Rudolph, G, Bowdery, Ck, Brodbeck, Tj, Finch, Aj, Foster, F, Hughes, G, Keemer, Nr, Nuttall, M, Rowlingson, B, Sloan, T, Snow, Sw, Barczewski, T, Bauerdick, Lat, Kleinknecht, K, Renk, B, Roehn, S, Sander, Hg, Schmelling, M, Steeg, F, Albanese, Jp, Aubert, Jj, Benchouk, C, Bonissent, A, Etienne, F, Nacasch, R, Payre, P, Pietrzyk, B, Qian, Z, Blum, W, Cattaneo, P, Comin, M, Cowan, G, Dehning, B, Dietl, H, Fernandezbosman, M, Hauff, D, Jahn, A, Lange, E, Lutjens, G, Lutz, G, Manner, W, Moser, Hg, Pan, Y, Richter, R, Schwarz, A, Settles, R, Stiegler, U, Stierlin, U, Stimpfl, G, Thomas, J, Waltermann, G, Debouard, G, Boucrot, J, Callot, O, Chen, X, Cordier, A, Davier, M, Ganis, G, Grivaz, Jf, Heusse, P, Janot, P, Journe, V, Kim, Dw, Lefrancois, J, Lloydowen, D, Lutz, Am, Marotte, P, Veillet, Jj, Amendolia, Sr, Bagliesi, G, Batignani, G, Bosisio, L, Bottigli, U, Bradaschia, C, Ferrante, I, Fidecaro, F, Foa, L, Focardi, E, Forti, F, Giassi, A, Giorgi, Ma, Ligabue, Franco, Lusiani, Alberto, Mannelli, Eb, Marrocchesi, P, Messineo, A, Palla, F, Sanguinetti, G, Scapellato, S, Steinberger, J, Tenchini, R, Tonelli, G, Triggiani, G, Carter, Jm, Green, Bj, Green, Mg, Mckemey, Ak, March, Pv, Medcalf, T, Saich, Mr, Strong, Ja, Thomas, Rm, Wildish, T, Botterill, Dr, Clifft, Rw, Edgecock, Tr, Edwards, M, Fisher, Sm, Harvey, J, Hill, Dl, Jones, Tj, Morrissey, M, Norton, Pr, Salmon, Dp, Thompson, Jc, Blochdevaux, B, Colas, P, Klopfenstein, C, Lancon, E, Locci, E, Loucatos, S, Mirabito, L, Monnier, E, Perez, P, Perrier, F, Rander, J, Renardy, Jf, Roussarie, A, Schuller, Jp, Ashman, Jg, Booth, Cn, Combley, F, Dinsdale, M, Martin, J, Parker, D, Thompson, Lf, Brandt, S, Burkhardt, H, Grupen, C, Meinhard, H, Neugebauer, E, Schafer, U, Seywerd, H, Stupperich, K, Gobbo, B, Liello, F, Milotti, E, Ragusa, F, Rolandi, Luigi, Bellantoni, L, Boudreau, Jf, Cinabro, D, Conway, J, Cowen, Df, Feng, Z, Harton, Jl, Hilgart, J, Jared, Rc, Johnson, Rp, Leclaire, Bw, Pan, Yb, Parker, T, Pater, Jr, Ritz, S, Saadi, Y, Sharma, V, Wear, Ja, Weber, Fv, Wu, Sl, Xue, St, and Zobernig, G.

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, Hadron, Higgs boson, Context (language use), Particle Physics - Experiment, Standard Model
Abstract

A search for the neutral Higgs boson, using the processes Z 0 → H 0 e + e − , Z 0 → H 0 μ + μ − , Z 0 → H 0 τ + τ − , Z 0 → H 0 v v and Z 0 → H 0 q q , is performed on data collected by the ALEPH detector corresponding to about 11 550 events of Z0 → hadrons. Combining all these processes, the mass range excluded is 32 MeV−15 GeV at 95% CL and 40 MeV−12 GeV at 99% CL. The result from this experiment is unambiguous in the context of the standard model.

Published
1989

148. [Thioamide derivatives with gastro-protective activity]

Author

E, Bousquet, F, Guerrera, M A, Siracusa, M, Matera, R, Bernardini, and G, Conforto

Subjects
Male, Thioamides, Gastrointestinal Agents, Animals, Rats, Inbred Strains, Amides, Rats
Abstract

A series of 3-aryl-prop-2-enthioamide derivatives has been synthesized. These compounds were evaluated for gastro-protective activity in the rat. It has been shown that the N,N-dimethylamino derivative was the most active compound in this series [Table I comp. (II)].

Published
1983

149. Study of neutrino-induced dimuon events in gargamelle at CERN-SPS

Author

B. Pattison, S. Natali, G. Carnesecchi, M. Willutzky, S. Ragazzi, D. Blum, C. Pascaud, N. Armenise, A. Pullia, P. Alibran, J. Bourotte, J. Gillespie, P. Lundborg, Donatella Cavalli, H. Sletten, E. Bellotti, J.P. Vialle, Ph. Heusse, F. Romano, S. Bonetti, M. Haguenauer, A.M. Lutz, B. Degrange, H. Burmeister, L. Zanotti, Gilbert Poulard, O. Erriquez, F. Jacquet, J. Sleeman, C. Matteuzzi, M. Rollier, G. Conforto, C. Longuemare, G. Bonneaud, P. Musset, A. Blondel, U. Nguyen-Khac, M.T. Fogli-Muciaccia, Salvatore Nuzzo, Heyd, Yvette, Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, Missing energy, Meson, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Hadron, Elementary particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, Particle decay, Gargamelle, Neutrino, Particle Physics - Experiment
Abstract

This letter reports a study of 117 opposite-sign and 41 like-sign dimuons, in a wide-band neutrino exposure of Gargamelle at CERN SPS. No signal is found in the μ − μ − channel. The μ − μ + channel is found to be dominated by D-meson production and decay. There is evidence in these events for missing energy which may be interpreted as an unseen neutrino. The V 0 multiplicities, K 0 /event=0.53 −0.20 +0.25 and Λ /event=0.03 −0.04 +0.06 show only evidence for charmed meson production. Information on the D-meson fragmentation function is presented. In a specific model, a rate σ (μ − μ + ) σ(μ − ) =(0.72±0.14×10 −2 is found, independent of the energy. An investigation of these events for visible D-decays sets a limit on the life-time τ D −12 s at 90% C.L.

Published
1979

150. Observation of radiative capture of negative muons in iron

Author

G. Conforto, L. Di Lella, and M. Conversi

Subjects
Coupling constant, Physics, Muon, Branching fraction, Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Gamma ray, General Physics and Astronomy, Polarization (waves), Asymmetry, Nuclear physics, Atomic physics, Neutrino, Circular polarization, Particle Physics - Experiment, media_common
Abstract

The reaction mu /sup -/ + N yields N/sup 1/ + nu + gamma was detected; rates of occurrence under given conditions were measured. Feasibility of experiments on the coupling constants, the circular polarization, and the gamma asymmetry of gamma emission from radiative capture of polarized muons by spinless nuclei was estimated. Evidence for occurrence of the process in Fe with a branching ratio off about 10/sup -4/ was found. (L.N.N.)

Published
1962

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