Author: "H. Gennow" - Searchworks@Jio Institute Digital Library Search Results

1. Argus: A universal detector at DORIS II

Author: V. Lubimov, T. S. Yoon, H. Schröder, J. Spengler, N. Kwak, W. Schmidt-Parzefall, H. Albrecht, R. Wurth, Leif J. Jönsson, C. W. Darden, P. C. H. Kim, W. Reinsch, B. Spaan, K. W. Edwards, A. Drescher, J. C. Yun, A. Semenov, I. Tichomirov, R. Ammar, M. Danilov, V. Shevchenko, Holger Schulz, Yu. Semenov, B.P. Padley, Douglas Gingrich, Anton Babaev, R. Heller, A. Krolzig, K. R. Schubert, Roland Waldi, K. W. McLean, V. Nagovitsin, H. Hasemann, William R. Frisken, R. Childers, E. Michel, P. Böckmann, J. A. McKenna, Y. Oku, D. B. Macfarlane, J. D. Prentice, D. Wegener, A. W. Nilsson, S. Weseler, U. Matthiesen, G. Tsipolitis, R. Davis, J. D. Swain, Robert K. Kutschke, D. Kamp, R. S. Orr, A. Golutvin, B. Gräwe, G. Harder, J. Stiewe, H. Kapitza, H. Gennow, M. Goddard, R. Gläser, V. Soloshenko, P. M. Patel, D. J. Gilkinson, Viktor Matveev, Yu. Zaitsev, H. C. J. Seywerd, U. Binder, G. Drews, V. Tchistilin, C. Fukunaga, F. Selonke, S. Kanekal, Werner Hofmann, E. Steinmann, A. Markees, A. Arefiev, K. Strahl, D. Coppage, V. Ryltsov, and H. Scheck
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Argus, Muon, Annihilation, Physics::Instrumentation and Detectors, Detector, Photon energy, Charged particle, Nuclear physics, Ionization, High Energy Physics::Experiment, Instrumentation, computer, computer.programming_language
Abstract: The detector ARGUS has been designed as a universal tool to investigate final states from e + e − annihilation processes in the energy range of the ϒ resonances. ARGUS started operation in October 1982 and has since successfully taken data at the ϒ(1S), ϒ(2S) and ϒ(4S) energies, and in the nearby continuum. The detector combines excellent charged particle identification and good photon energy resolution over more than 90% of the full solid angle. A particle originating from the interaction vertex and leaving the beam tube traverses the following components: the vertex drift chamber, the main drift chamber which determines its momentum and specific ionization, the time-of-flight system through which its velocity is determined, and the electromagnetic calorimeter. Muons pass through the magnet coils and the flux return yoke and finally hit the muon chamber system which surrounds the detector. The momentum resolution of ARGUS is σ (p T ) P T = (0.01 2 + (0.009p T [ GeV /c]) 2 ) 1 2 , the photon energy resolution in the barrel shower counters is σ (E) E = ( 0.072 2 +0.065 2 E[ GeV ] ) 1 2 . Combining the information from all p devices, more than 80% of all charged hadrons can be recognized unambiguously. The electron-hadron and muon-hadron rejection rates are 1:200 and 1:50 respectively.
Published: 1989
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2. Rescattering Effects in 19 GeV/c PD Interactions and Search for a ΔΔ Component in the Deuteron

Author: E. Sundell, V. Bakken, M Pimiä, B. Sellden, P Lundborg, J Mäkelä, and H Gennow
Subjects: Physics, Range (particle radiation), Particle physics, Proton, 010308 nuclear & particles physics, Component (thermodynamics), Nuclear Theory, Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Momentum, Nuclear physics, Deuterium, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Low Mass, Wave function, Mathematical Physics
Abstract: Data on pd interactions at 19 GeV/c are used to study spectator proton distributions. A large excess of protons in the momentum range > 200 MeV/c is seen, compared to what the spectator model predicts on the basis of the deuteron wave function. We find that this excess approximately can be described by initial and final state rescattering processes. The mass distributions of the spectator-pion systems show a low mass enhancement. This enhancement is interpreted as partly due to kinematics but also due to the rescattering effects. From the prediction of our model an upper limit for the ΔΔ component in the deuteron is 0.1 ± 0.2%.
Published: 1979
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3. Observation of B0-B0 mixing

Author: D. Wegener, M. Pleško, S. Kanekal, Y. Oku, M. Danilov, V. Lubimov, B. Fominykh, M. Schäfer, A. Yagil, P. M. Patel, Roland Waldi, Yu. Zaitsev, J. C. Gabriel, J. Spengler, N. Kwak, W. Schmidt-Parzefall, R. S. Orr, D. J. Gilkinson, J. Stiewe, T. Ruf, K. Strahl, P. Böckmann, H. Gennow, A.A. Andam, C. W. Darden, William R. Frisken, A. Golutvin, H. Schröder, R. Davis, A. Semenov, J. D. Swain, D. Coppage, Holger Schulz, R. Gläser, I. Tichomirov, A. Nippe, D. B. Macfarlane, V. Soloshenko, G. Tsipolitis, S. Weseler, J. A. Parsons, K. W. Edwards, H. C. J. Seywerd, H. Kapitza, Hermann Kolanoski, V. Shevchenko, C. Ehmann, H. Scheck, Leif J. Jönsson, U. Matthiesen, U. Binder, R. Ammar, B. Spaan, V. Nagovitsin, V. Matveev, Douglas Gingrich, K. W. McLean, Anton Babaev, J. A. McKenna, H. Albrecht, K. R. Schubert, J. P. Donker, R. Wurth, G. Kernel, B. Boštjančič, I. V. Gorelov, V. Tchistilin, R. Childers, Robert K. Kutschke, A. Drescher, J. C. Yun, P. C. H. Kim, V. Ryltsov, G. Harder, P. Padley, J. D. Prentice, A. W. Nilsson, T. S. Yoon, and D. Kamp
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Argus, Electron–positron annihilation, Detector, Signal, computer, Standard deviation, Mixing (physics), Storage ring, computer.programming_language, Lepton
Abstract: Using the ARGUS detector at the DORIS II storage ring we have searched in three different ways for B0- B 0 mixing in ϒ (4S) decays. One explicitly mixed event, a decay ϒ (4S)→B0B0, has been completely reconstructed. Furthermore, we observe a 4.0 standard deviation signal of 24.8 events with like-sign lepton pairs and a 3.0 standard deviation signal of 4.1 events containing one reconstructed B0( B 0) and an additional fast l+(l)−. This leads to the conclusion that B0- B 0 mixing is substantial. For the mixing parameter we obtain r=0.21±0.08.
Published: 1987
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4. First observation of γγ → ωω

Author: J. Spengler, N. Kwak, W. Schmidt-Parzefall, C. W. Darden, K. W. Edwards, Y. Oku, D. Wegener, A.A. Andam, R. Gläser, A. Drescher, J. C. Yun, J. P. Donker, G. Harder, R. Davis, V. Shevchenko, P. Padley, T. S. Yoon, P. M. Patel, J. A. Parsons, H. Kapitza, J. D. Swain, P. C. H. Kim, T. Ruf, K. R. Schubert, Yu. Zaitsev, K. W. McLean, J. A. McKenna, H. Scheck, A. Semenov, B. Spaan, R. Childers, A. Yagil, Leif J. Jönsson, Roland Waldi, Robert K. Kutschke, D. Kamp, J. C. Gabriel, V. Soloshenko, H. Albrecht, J. D. Prentice, A. W. Nilsson, Anton Babaev, R. Wurth, M. Pleško, A. Golutvin, K. Strahl, I. Tichomirov, P. Böckmann, H. Gennow, D. Coppage, M. Schäfer, V. Nagovitsin, R. S. Orr, H. Schröder, B. Boštjančič, C. Ehmann, R. Ammar, V. Ryltsov, Douglas Gingrich, Viktor Matveev, G. Kernel, William R. Frisken, A. Nippe, D. B. Macfarlane, V. Tchistilin, S. Weseler, S. Kanekal, Mikhail Danilov, B. Fominykh, I. V. Gorelov, J. Stiewe, Holger Schulz, U. Matthiesen, H. C. J. Seywerd, U. Binder, D. J. Gilkinson, G. Tsipolitis, Hermann Kolanoski, and V. Lubimov
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Cross section (physics), Argus, Meson, DESY, computer, Storage ring, computer.programming_language
Abstract: The reaction γγ → 2π+ 2π− 2π0 has been studied using the ARGUS detector at the e+e− storage ring DORIS II at DESY. Production of ω mesons is observed and, in particular, the reaction γγ → ωω is seen for the first time. The cross section for γγ → ωω has an enhancement at ∼ 1.9 GeV/c2 of about 10 nb. The cross sections for γγ → 2π+ 2π− 2π0 and γγ → ωπ+ π− π0 are also given.
Published: 1987
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5. Electroweak asymmetry in deep inelastic muon-nucleon scattering

Author: J.F. Renardy, U. Meyer-Berkhout, S. Wojcicki, I.A. Savin, R. Kopp, Y. Sacquin, Tom Dobrowolski, G.I. Smirnov, M. Virchaux, A. Kondor, A. Milsztajn, P. Rich-Hennion, D. Schinzel, A. Staude, James Pilcher, Yu.T. Kiryushin, A. Argento, J. Žáček, R. Tirler, L. Piemontese, A.G. Volodko, V. S. Kisselev, V.G. Krivokhizhin, D. Jamnik, J. Cvach, W. D. Nowak, Igor Golutvin, Rene Brun, Victor Kukhtin, J. Feltesse, J. O'Connor, M. Cribier, D. Bollini, H. Gennow, P.T. Todorov, Matthew Henry Klein, Gyorgy Vesztergombi, G. Heiman, Tiziano Camporesi, M. Goossens, D. Yu. Burdin, P. Verrecchia, M. Bozzo, Alberto Benvenuti, K. M. Teichert, Francesco Navarria, L. Monari, Č. Zupančič, G. Smadja, Rudiger Voss, and N.G. Fadeev
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Neutral current, Physics::Instrumentation and Detectors, media_common.quotation_subject, Momentum transfer, Electroweak interaction, High Energy Physics::Phenomenology, Weinberg angle, Inelastic scattering, Deep inelastic scattering, Asymmetry, lcsh:QC1-999, Nuclear physics, High Energy Physics::Experiment, Particle Physics - Experiment, lcsh:Physics, media_common
Abstract: At the CERN SPS we have measured a deep inelastic μ± cross section asymmetry at momentum transfers Q2 ranging from 15 to 180GeV2. The result is in quantitative agreement with the WS/GIM standard electroweak model and allows to determine the muon neutral current couplings.
Published: 1983

6. Evidence for the decay τ−→ντωπ−

Author: K. R. Schubert, Leif J. Jönsson, J. D. Swain, D. Wegener, V. Lubimov, K. W. Edwards, I. Tichomirov, S. Kanekal, P. Böckmann, H. Gennow, M. Danilov, H. Kapitza, G. Tsipolitis, William R. Frisken, N. Kwak, W. Schmidt-Parzefall, M. Pleško, Roland Waldi, H. Scheck, Holger Schulz, R. S. Orr, J. C. Gabriel, I. Lembke-Koppitz, C. W. Darden, R. Childers, R. Davis, Y. Oku, J. D. Prentice, A. W. Nilsson, V. Nagovitsin, D. Kamp, D. B. Macfarlane, S. Weseler, K. Strahl, V. Soloshenko, U. Matthiesen, A. Semenov, H. Albrecht, D. Coppage, Robert K. Kutschke, G. Harder, J. P. Donker, V. Shevchenko, R. Wurth, B. Spaan, D. J. Gilkinson, P. Padley, V. Matveev, K. W. McLean, A. Golutvin, V. Ryltsov, J. A. McKenna, J. A. Parsons, R. Gläser, B. Boštjančič, R. Ammar, Douglas Gingrich, J. Spengler, G. Kernel, Anton Babaev, V. Tchistilin, I. V. Gorelov, U. Binder, H. Schröder, J. Stiewe, H. C. J. Seywerd, A. Yagil, P. M. Patel, Yu. Zaitsev, A. Drescher, J. C. Yun, P. C. H. Kim, and T. S. Yoon
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Pion, Branching fraction, Electron–positron annihilation, Mass spectrum, Spectral function, computer, computer.programming_language
Abstract: Using the ARGUS detector at DORIS II, we have analyzed tau decays into π − π − π + π 0 ν τ . The branching ratio was determined to be (4.2±0.5±0.9)%. From a study of the three pion sub-system, we find evidence for the decay τ − → ωπ − ν τ with a branching ratio of (1.5±0.3±0.3)%. The ωπ − system is found to be predominantly in a J P =1 − state. There is no evidence for second-class axial-vector currents. The spectral function for the ωπ − final state is in agreement with a prediction based on CVC and σ e + e −→ ωπ 0 .
Published: 1987
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7. Observation of B-meson decay into

Author: U. Binder, Holger Schulz, H. Scheck, D. Wegener, M. Pleško, I. Lembke-Koppitz, Robert K. Kutschke, D. Coppage, C. Fukunaga, A. Golutvin, H. Schröder, T. S. Yoon, J. Stiewe, K. W. McLean, H. Albrecht, U. Matthiesen, J. A. McKenna, R. Wurth, Anton Babaev, Leif J. Jönsson, A. Philipp, V. Lubimov, P. C. H. Kim, K. R. Schubert, H. C. J. Seywerd, J. Spengler, N. Kwak, W. Schmidt-Parzefall, C. W. Darden, R. Davis, D. J. Gilkinson, M. Goddard, V. Nagovitsin, K. W. Edwards, A. Drescher, J. C. Yun, R. Childers, V. Shevchenko, V. Ryltsov, P. M. Patel, Yu. Zaitsev, Roland Waldi, William R. Frisken, D. B. Macfarlane, S. Weseler, B. J. Stacey, Viktor Matveev, G. Kernel, R. Ammar, Douglas Gingrich, V. Soloshenko, R. S. Orr, A. Semenov, H. Kapitza, B. Gräwe, G. Harder, V. Sopov, P. Padley, J. D. Prentice, A. W. Nilsson, Y. Oku, S. Kanekal, Mikhail Danilov, I. Tichomirov, N. N. Brown, and H. Gennow
Subjects: Nuclear physics, Physics, Momentum, Nuclear and High Energy Physics, Argus, Recoil, Branching fraction, Electron–positron annihilation, B meson, Atomic physics, computer, Storage ring, computer.programming_language
Abstract: Using the ARGUS detector at the e+e− storage ring DORIS II, we have observed the colour suppressed decay B → J ψ X , with a branching ratio of (1.37+0.6−0.5)% for the mixture of charged and neutral B's produced on the ϒ(4S). From the momentum distribution of the J ψ we conclude that Br ( B → J ψ X ) CL ) , for recoil masses, mx, less than 1 GeV/c2.
Published: 1985
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8. First observation of γγ → ωϱ0

Author: C. Ehmann, K. W. Edwards, S. Weseler, B. Spaan, J. D. Prentice, P. Böckmann, A. W. Nilsson, A. Semenov, R. S. Orr, V. Chistilin, D. Wegener, Robert K. Kutschke, N. Kwak, H. Scheck, W. Schmidt-Parzefall, D. Coppage, Georgios Tsipolitis, A. Golutvin, H. Albrecht, C. W. Darden, M. Danilov, Doug Gingrich, R. Wurth, H. Schröder, D. B. MacFarlane, R. Childers, A. Yagil, A.A. Andam, V. Ryltsov, J. C. Gabriel, V. Matveev, V. Lyubimov, V. Shevchenko, R. Ammar, William R. Frisken, T. Ruf, M. Pleško, P. M. Patel, R. Waldi, A. Nippe, J. D. Swain, K. W. McLean, J. Stiewe, K. Strahl, J. A. McKenna, G. Harder, J. A. Parsons, M. Schäfer, J. Spengler, H. Kapitza, A. Drescher, J. C. Yun, H. Seywerd, Yu. Zaitsev, B. Boštjančič, J. P. Donker, R. Gläser, P. C. H. Kim, B. Fominykh, G. Kernel, I. Tikhomirov, B.Paul Padley, R. Davis, D. J. Gilkinson, V. Soloshenko, D. Kamp, Anton Babaev, T. S. Yoon, I. V. Gorelov, V. Nagovitsyn, Hermann Kolanoski, Y. Oku, H. Gennow, Holger Schulz, S. Kanekal, U. Matthiesen, K. R. Schubert, Leif J. Jönsson, and U. Binder
Subjects: Nuclear physics, Scattering cross-section, Physics, Nuclear and High Energy Physics, Argus, Mass spectrum, computer, Omega, Gamma gamma, computer.programming_language
Published: 1987
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9. Observation of octet and decuplet hyperons in e+e− annihilation at 10 GeV centre-of-mass energy

Author: M. Danilov, H.D. Schulz, V. Matveev, J. D. Swain, H. Albrecht, V. Shevchenko, Roland Waldi, J. C. Gabriel, R. Davis, Y. Oku, B. Spaan, T. S. Yoon, Leif J. Jönsson, K. Strahl, K. W. McLean, R. Childers, D. Coppage, J. A. McKenna, D. J. Gilkinson, J. A. Parsons, D. Wegener, A. Drescher, J. C. Yun, J. Spengler, P. C. H. Kim, M. Pleško, N. Kwak, W. Schmidt-Parzefall, V. Nagovitsin, G. Kernel, Anton Babaev, C. W. Darden, K. R. Schubert, V. Tchistilin, P. Böckmann, H. Gennow, K. W. Edwards, H. Scheck, S. Kanekal, H. Schröder, William R. Frisken, U. Matthiesen, I. Lembke-Koppitz, D. B. Macfarlane, S. Weseler, U. Binder, A. Yagil, P. M. Patel, A. Semenov, Robert K. Kutschke, R. Wurth, Yu. Zaitsev, V. Soloshenko, C. Fukunaga, I. Tichomirov, R. Gläser, B. Boštjančič, R. Ammar, V. Lubimov, Douglas Gingrich, V. Ryltsov, A. Golutvin, I. V. Gorelov, J. Stiewe, D. Kamp, H. C. J. Seywerd, H. Kapitza, J. P. Donker, R. S. Orr, G. Tsipolitis, J. D. Prentice, A. W. Nilsson, G. Harder, and P. Padley
Subjects: Baryon, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Argus, Annihilation, Octet, Electron–positron annihilation, Hyperon, computer, computer.programming_language
Abstract: Results on hyperon production are reported for data accumulated at 10 GeV centre-of-mass energy with the ARGUS detector. Signals for both the octet states Λ, Σ 0 and Ξ − and the decuplet states Σ ± (1385), Ξ 0 (1530) and Ω − are observed 1 (references to a specific state are to be interpreted as also implying the charge conjugate state), some for the first time in e + e − annihilation. Baryon rates from γ dir (1S) decays are enhanced by a factor of about 3 over the continuum.
Published: 1987
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10. Search for exotic decay modes of the ϒ(1S)

Author: K. Strahl, B. Spaan, K. W. Edwards, H. Scheck, I. Lembke-Koppitz, D. Coppage, K. R. Schubert, K. W. McLean, V. Nagovitsin, R. Davis, H. Albrecht, H. Kapitza, J. A. McKenna, Y. Oku, D. Wegener, R. Wurth, D. J. Gilkinson, R. Childers, I. Tichomirov, A. Philipp, V. Lubimov, M. Pleško, M. Goddard, V. Ryltsov, R. Gläser, J. Spengler, N. Kwak, W. Schmidt-Parzefall, Holger Schulz, S. Kanekal, C. W. Darden, V. Shevchenko, Mikhail Danilov, R. S. Orr, J. P. Donker, A. Yagil, U. Matthiesen, D. Kamp, Viktor Matveev, G. Kernel, Anton Babaev, A. Semenov, P. M. Patel, Yu. Zaitsev, V. Soloshenko, V. Tchistilin, U. Binder, Roland Waldi, J. C. Gabriel, C. Fukunaga, I. V. Gorelov, G. Harder, J. Stiewe, R. Ammar, H. C. J. Seywerd, P. Böckmann, H. Gennow, Douglas Gingrich, P. Padley, J. D. Prentice, A. W. Nilsson, Leif J. Jönsson, H. Schröder, Robert K. Kutschke, A. Golutvin, William R. Frisken, D. B. Macfarlane, S. Weseler, A. Drescher, J. C. Yun, T. S. Yoon, and P. C. H. Kim
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Argus, Meson, Branching fraction, Electron–positron annihilation, DESY, Atomic physics, Neutral particle, computer, Storage ring, computer.programming_language
Abstract: A search for two exotic decay modes of the ϒ (1 S ) meson has been made using the ARGUS detector at the e + e − storage ring DORIS II at DESY. The first was ϒ (1 S ) decays into weakly interacting particles, for which an upper limit of 2.3% at the 90% CL on the branching ratio is found. The second mode was ϒ (1 S )→ γ a, where a is a neutral particle with mass less than 1.5GeV/ c 2 , that either decays inside the detector or is sufficiently long-lived to escape detection. For short-lived particles a decaying into an e + e − pair, upper limits on the BR( ϒ (1 S )→ γ a) of 3.1 × 10 − at the 90% CL are found. The upper limit without restriction on the lifetime of a is found to be 1.3 × 10 −3 . Limits for other decay modes are also given.
Published: 1986
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11. Determination of the branching ratio for the decay B0→D∗−π+

Author: K. W. Edwards, S. Kanekal, V. Ryltsov, D. Kamp, I. Tichomirov, H.D. Schulz, A. Semenov, William R. Frisken, R. Ammar, Douglas Gingrich, J. Stiewe, D. Wegener, D. B. Macfarlane, K. Strahl, H. Schröder, S. Weseler, R. Davis, B. Spaan, W. Schmidt-Parzefall, J. Spengler, Anton Babaev, N. Kwak, D. Coppage, U. Matthiesen, H. Albrecht, H. C. J. Seywerd, J. D. Prentice, V. Soloshenko, D. J. Gilkinson, A. Yagil, R. S. Orr, V. Matveev, Leif J. Jönsson, U. Binder, A. W. Nilsson, A. Golutvin, H. Scheck, K. R. Schubert, C. W. Darden, P. M. Patel, I. Lembke-Koppitz, C. Fukunaga, M. Pleško, A. Phillip, V. Shevchenko, P. C. H. Kim, Robert K. Kutschke, M. Goddard, G. Harder, R. Gläser, Y. Oku, Yu. Zaitsev, R. Childers, G. Kernel, I. V. Gorelov, P. Padley, R. Wurth, K. W. McLean, J. A. McKenna, P. Böckmann, H. Gennow, V. Tchistilin, M. Danilov, Roland Waldi, J. C. Gabriel, V. Nagovitsin, A. Drescher, J. C. Yun, T. S. Yoon, V. Lubimov, J. P. Donker, and H. Kapitza
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Branching fraction, Electron–positron annihilation, computer, computer.programming_language
Published: 1986
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12. Neutron fragmentation in the reaction pn→pX at 19 GeV/c

Author: B. Sellden, Jorma Tuominiemi, M. Pimiä, P. Lundborg, E. Sundell, H. Gennow, J. Mäkelä, and V. Bakken
Subjects: Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, dBc, Rest frame, 01 natural sciences, Nuclear physics, Pion, Fragmentation (mass spectrometry), 0103 physical sciences, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, Exchange model
Abstract: Data on the reaction pn→pX are extracted from a pd experiment in the CERN 2m DBC at 19 GeV/c. The cross-section for neutron fragmentation events with |t
Published: 1979
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13. Radiative decays of the ϒ(2S) into the three χb states

Author: V. Nagovitsin, Roland Waldi, V. Ryltsov, D. Wegener, S. Kanekal, Mikhail Danilov, P. C. H. Kim, M. Goddard, D. Coppage, K. W. McLean, M. Pleško, V. Shevchenko, J. A. McKenna, K. R. Schubert, H. Schröder, U. Binder, T. S. Yoon, A. Philipp, V. Lubimov, I. Tichomirov, Holger Schulz, C. Fukunaga, N. Kwak, W. Schmidt-Parzefall, William R. Frisken, N. N. Brown, H. Scheck, J. Stiewe, C. W. Darden, Leif J. Jönsson, I. Lembke-Koppitz, J. Spengler, R. Davis, D. B. Macfarlane, U. Matthiesen, H. C. J. Seywerd, S. Weseler, H. Albrecht, A. Drescher, J. C. Yun, D. J. Gilkinson, Anton Babaev, B. J. Stacey, R. Wurth, K. W. Edwards, V. Sopov, Viktor Matveev, G. Kernel, Robert K. Kutschke, P. M. Patel, A. Golutvin, Yu. Zaitsev, R. Childers, A. Semenov, V. Soloshenko, B. Gräwe, G. Harder, H. Kapitza, R. S. Orr, P. Padley, H. Gennow, R. Ammar, Douglas Gingrich, J. D. Prentice, A. W. Nilsson, and Y. Oku
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Photon, Spectrometer, Electron–positron annihilation, Radiative transfer, Atomic physics, computer, Storage ring, computer.programming_language
Abstract: The ARGUS detector at the e + e − storage ring DORIS II has been used as a pair spectrometer to study the photon transitions in the reaction ϒ (2S)→ γχ b (1 3 P 2,1,0 ). Three photon lines were observed with energies (110.6±0.3±0.9) MeV, (131.7±0.3±1.1) MeV and (162.1±0.5±1.4) MeV, respectively. The corresponding branching ratios were found to be (9.8±2.1±2.4)%, (9.1±1.8±2.2)% and (6.4±1.4±1.6)%. Upper limits for full widths at the 90% confidence limit are 1.0 MeV for the χb (1 3 P 2 ) and 2.6 MeV for the other two states.
Published: 1985
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14. An upper limit for two-jet production in directϒ(1S) decays

Author: Robert K. Kutschke, D. Wegener, J. Stiewe, V. Shevchenko, R. S. Orr, A. Philipp, A. Golutvin, B. J. Stacey, K. R. Schubert, Viktor Matveev, G. Kernel, Y. Oku, V. Lubimov, V. Sopov, V. Soloshenko, Holger Schulz, Wr Frisken, A. Semenov, U. Binder, H. Gennow, J. Spengler, S. Kanekal, U. Matthiesen, W. Schmidt-Parzefall, D. Coppage, H. Scheck, C. Fukunaga, P. C. H. Kim, I. Lembke-Koppitz, Doug Gingrich, R. Davis, D. J. Gilkinson, V. Nagovitsin, Roland Waldi, J. C. Gabriel, J. P. Donker, C. W. Darden, H. Albrecht, P. M. Patel, Yu. Zaitsev, Leif J. Jönsson, S. Weseler, V. Ryltsov, R. Wurth, R. Ammar, T. S. Yoon, K. W. McLean, J. A. McKenna, A. Drescher, J. C. Yun, I. Tichomirov, Mikhail Danilov, D. B. MacFarlane, R. Childers, H. Kapitza, K. W. Edwards, G. Harder, P. Padley, H. Seywerd, J. D. Prentice, A. W. Nilsson, Anton Babaev, M. Goddard, M. Pleško, B. Spaan, N. Kwak, and H. Schröder
Subjects: Physics, Particle physics, Argus, Jet (fluid), Physics and Astronomy (miscellaneous), Electron–positron annihilation, Continuum (design consultancy), Resonance, Elementary particle, DESY, Nuclear physics, Engineering (miscellaneous), computer, Storage ring, computer.programming_language
Abstract: Using the ARGUS detector at thee + e − storage ring DORIS II at DESY, we have studied the distribution of various topological quantities on the Υ(1S) resonance and in the nearby continuum. With the help of the second Fox-Wolfram moment we determine the two-jet contribution to direct Υ(1S) decays to be less than 5.3% with 95% confidence.
Published: 1986
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15. A high luminosity spectrometer for deep inelastic muon scattering experiments

Author: Y. Sacquin, U. Meyer-Berkhout, K. M. Teichert, C. Rubbia, B. Pichard, A.V. Vishnevsky, V. S. Kisselev, L.V. Svetov, I.M. Ivanchenko, Y.L. Zlobin, Yu.T. Kiryushin, Alberto Benvenuti, Victor Kukhtin, A. Milsztajn, A. Staude, J. Feltesse, J. Žáček, R. Tirler, M. Virchaux, V.G. Krivokhizhin, B. Rothan, A.V. Zarubin, L. Piemontese, Francesco Navarria, D. Schinzel, A.G. Volodko, I.A. Savin, J.C. Michau, J.F. Renardy, M. Bozzo, Rene Brun, F. Nanni, R. Kopp, P. Verrecchia, V.S. Khabarov, D. Bollini, W.D. Nowak, L. Monari, Č. Zupančič, H. Gennow, Rudiger Voss, G. Vesztergombi, G. Smadja, D. Jamnik, G. Heiman, M. Goossens, P.L. Frabetti, F. Navach, J. Cvach, G. Laurenti, Igor Golutvin, and D.A. Smolin
Subjects: Physics, Nuclear physics, Particle physics, Data acquisition, Luminosity (scattering theory), Muon, Spectrometer, Scattering, General Engineering, High Energy Physics::Experiment, Torus, Detectors and Experimental Techniques
Abstract: A 50 m long magnetized iron torus enclosing a 40 m long target provides the luminosity and acceptance necessary for the study of deep inelastic muon scattering at high Q 2 . The construction and performance of this spectrometer and the associated trigger are described. Details of the data acquisition system and data analysis are also given.
Published: 1983
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16. Observation of F decays into

Author: V. Ryltsov, H. Albrecht, H.D. Schulz, A. Semenov, V. Shevchenko, K. W. McLean, J. A. McKenna, U. Matthiesen, M. Danilov, A. Philipp, D. Kamp, J. Spengler, N. Kwak, Roland Waldi, J. C. Gabriel, B. Spaan, R. Ammar, V. Lubimov, C. W. Darden, R. Davis, A. Yagil, Anton Babaev, A. Drescher, J. C. Yun, J. P. Donker, P. M. Patel, K. Strahl, W. Schmidt-Parzefall, Leif J. Jönsson, Douglas Gingrich, P. C. H. Kim, M. Pleško, D. Coppage, Yu. Zaitsev, H. Scheck, H. Schröder, K. W. Edwards, I. Lembke-Koppitz, Y. Oku, D. Wegener, H. Kapitza, M. Goddard, R. S. Orr, V. Nagovitsin, R. Wurth, R. Gläser, V. Matveev, S. Kanekal, B. J. Stacey, A. Golutvin, K. R. Schubert, G. Kernel, T. S. Yoon, V. Soloshenko, V. Tchistilin, I. Tichomirov, R. Childers, D. J. Gilkinson, I. V. Gorelov, U. Binder, C. Fukunaga, J. Stiewe, H. C. J. Seywerd, J. D. Prentice, A. W. Nilsson, G. Harder, P. Padley, P. Böckmann, H. Gennow, William R. Frisken, D. B. Macfarlane, S. Weseler, and Robert K. Kutschke
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Electron–positron annihilation, Diagram, Detector, DORIS (geodesy), Channel (broadcasting), computer, computer.programming_language
Abstract: Using the ARGUS detector at DORIS II, the decay of F+→K∗0K+, and the ratio BR(F+→K∗0K+)/BR(F+→ φπ+) is found to be 1.44±0.37. This is a substantial rate for a decay channel which cannot proceed via a colour-favoured diagram.
Published: 1986
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17. Search for narrow states coupling to τ pairs in radiative ϒ decays

Author: K. W. McLean, J. A. McKenna, U. Binder, H. Gennow, D. J. Gilkinson, I. Tichomirov, C. Fukunaga, J. Spengler, A. Philipp, V. Lubimov, R. Davis, V. Soloshenko, W. Schmidt-Parzefall, D. Coppage, A. Drescher, J. C. Yun, H. Scheck, B. Gräwe, B. J. Stacey, A. Semenov, Viktor Matveev, G. Kernel, Leif J. Jönsson, G. Harder, N. N. Brown, C. W. Darden, Douglas Gingrich, P. Padley, H. Albrecht, P. M. Patel, V. Sopov, R. Wurth, M. Pleško, H. Schröder, J. D. Prentice, A. W. Nilsson, Roland Waldi, Yu. Zaitsev, J. Stiewe, Y. Oku, K. R. Schubert, N. Kwak, Mikhail Danilov, V. Shevchenko, K. W. Edwards, R. S. Orr, William R. Frisken, H. C. J. Seywerd, R. Heller, D. B. Macfarlane, N. Nagovitsin, S. Weseler, Robert K. Kutschke, D. Wegener, M. Goddard, P. Böckmann, Holger Schulz, S. Kanekal, U. Matthiesen, R. Childers, H. Hasemann, P. C. H. Kim, V. Ryltsov, T. S. Yoon, and R. Ammar
Subjects: Physics, Coupling, Nuclear and High Energy Physics, Photon, Meson, Branching fraction, Electron–positron annihilation, Radiative transfer, Monochromatic color, Atomic physics, Line (formation)
Abstract: We have investigated the ϒ→γττ using tagged ϒ mesons from the decay ϒ'→π + π − ϒ. The photon spectrum exhibits no monochromatic line corresponding to a narrow object decaying into a τ pair and is fully compatible with the expected background contributions. The branching ratio Br(ϒ→τ + τ − is determined to be (3.07±0.46±0.22)%.
Published: 1985
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18. Coherent Production of Two and Three Pions inpdReactions at 19 GeV/c

Author: V. Bakken, M. Pimiä, Jorma Tuominiemi, R. Møllerud, B. Sellden, P Lundborg, E. Sundell, J. Mäkelä, and H Gennow
Subjects: Physics, 010308 nuclear & particles physics, Condensed Matter Physics, 01 natural sciences, Helicity, Atomic and Molecular Physics, and Optics, Pion, 0103 physical sciences, Mass spectrum, Production (computer science), Atomic physics, 010306 general physics, Spin (physics), Mathematical Physics
Abstract: The coherent reactions pd → pdπ+π-, pd → pdπ+π-π0 and pd → ndπ+π+π- are studied at 19 GeV/c. In the two first reactions strong production of Δ2+(1236) is observed. Some ρ and ω production is seen in the second reaction. Production of d*0 and d*+ is observed in the first and second reactions respectively. Clear enhancements are seen at 1500 and 1700 MeV in the pπ+π- mass spectrum of the pd → pdπ+π- channel. From an analysis of the moments of the decay angular distributions of the pπ+π- system we find that the most important contributions to the 1450 and 1700 MeV structures come from spin 3/2 and spin 5/2 states respectively. We find evidence against s-channel helicity conservation and some evidence against t-channel helicity conservation.
Published: 1979
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19. The hadronic transitions from Υ(2S) to Υ(1S)

Author: Y. Oku, D. Wegener, P. Padley, A. Yagil, V. Lubimov, J. C. Yun, J. P. Donker, R. Childers, V. Shevchenko, H. Scheck, Leif J. Jönsson, H. Albrecht, R. Wurth, H. Schröder, P. Böckmann, H. Gennow, I. Tichomirov, J. Spengler, W. Schmidt-Parzefall, D. Coppage, A. Drescher, R. Davis, J. A. McKenna, R. S. Orr, H. Kapitza, C. W. Darden, D. J. Gilkinson, K. W. Edwards, D. Kamp, Mikhail Danilov, T. S. Yoon, D. B. MacFarlane, Viktor Matveev, G. Kernel, M. Pleško, Holger Schulz, A. W. Nilsson, V. Tchistilin, Anton Babaev, J.D. Prentice, R. Kutschke, I. V. Gorelov, V. Nagovitsin, R. Heller, Yu. Zaitsev, S. Kanekal, U. Matthiesen, V. Ryltsov, A. Golutvin, A. Semenov, Roland Waldi, J. C. Gabriel, U. Binder, R. Ammar, P. M. Patel, N. Kwak, K. W. McLean, Wr Frisken, G. Harder, P. C. H. Kim, K. R. Schubert, J. Stiewe, B. Spaan, R. Gläser, K. Fritz, Douglas Gingrich, S. Weseler, V. Soloshenko, H. C. J. Seywerd, and B. Boštjančič
Subjects: Nuclear physics, Physics, Particle physics, Argus, Pion, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Current algebra, Multipole expansion, Engineering (miscellaneous), computer, computer.programming_language
Abstract: Using the ARGUS detector at DORIS, we have investigated the hadronic transitions of the Υ(2S) to the Υ(1S). The decays to Υ(1S)π+π−, Υ(1S)π0π0 and Υ(1S)η where the Υ(1S) subsequently decays intoe+e− and Υ(1S)η have been investigated. The transition via two charged pions has also been studied inclusively. We obtain branching ratios of the Υ(2S) into Υ(1S)π+π− of (18.1±0.5±1.0)%, into Υ(1S)π0π0 of (9.5±1.9±1.9)% and into Υ(1S)η of less than 0.5% with 90% confidence. From the exclusive events we find the leptonic branching ratios of the Υ(1S) to beBee=(2.42±0.14±0.14)% andBμμ=(2.30±0.25±0.13)%. Kinematical parameters of the two pion transitions have been investigated in detail and found to be consistent with current algebra and colour-field multipole expansion.
Published: 1987
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20. Crossed Channel Isospin Amplitude Analysis of the Reaction pN→Nπ Δ(1236) above 6 GeV/c Incident Momentum

Author: V. Bakken, E. Sundell, H. Gennow, J. Mäkelä, M. Pimiä, B. Sellden, T. Jacobsen, P. Lundborg, and J.E. Olsson
Subjects: Physics, Isovector, 010308 nuclear & particles physics, Isoscalar, Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Momentum, Nuclear physics, Amplitude, Pion, Isospin, 0103 physical sciences, 010306 general physics, Mathematical Physics
Abstract: Data on the reactions pn → NπΔ(1236) and pp → NπΔ(1236) at 19 GeV/c have been used to study the reactions pN → N(πΔ) and pN → (Nπ)Δ in terms of crossed channel isospin amplitudes. The cross section of the reaction pN → N(πΔ) is about twice that of pN → (Nπ)Δ. Each reaction can be described by three amplitudes MIIx, where Ix and I are the isospins of the exchange and of the Δπ or Nπ system, respectively. We find that for the reaction where the pion clusters to the Δ, i.e., pN → N(πΔ), the isoscalar exchange is the leading mechanism, but the M3/21 amplitude also gives a large contribution. For the other reaction, i.e., pN → (Nπ)Δ, the isovector exchange amplitude leading to a I = 3/2 Nπ state, is dominating. The Ix = 2 exchange amplitude is unimportant. These results have been compared with the results of similar analyses of other three-body reactions and some common features and differences have been pointed out. Available data at other energies have been used to investigate the energy dependence of the isospin amplitudes for the reaction pN → ΔπN in a double exchange representation. It is found that the amplitude involving isoscalar exchange is dominating above 20 GeV/c and has a weak energy dependence while the amplitude with double isovector exchange has an energy dependence pnlab with n ≈ - 1.5.
Published: 1978
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21. The decay $$D^0 \to \bar K^0 \phi $$

Author: P. Böckmann, H. Gennow, N. Kwak, Y. Oku, D. Wegener, P. C. H. Kim, M. Pleŝko, J. Jönsson, R. Ammar, J. Stefan, Mikhail Danilov, Georgios Tsipolitis, J. P. Donker, Holger Schulz, R. S. Orr, K. W. McLean, J. A. McKenna, R. Davis, D. B. MacFarlane, I. V. Gorelov, K. Strahl, B. Spaan, V. Lubimov, S. Kanekal, U. Matthiesen, U. Binder, Doug Gingrich, R. Childers, A. Golutvin, R. Gläser, Roland Waldi, J. Spengler, W. Schmidt-Parzefall, D. Coppage, T. S. Yoon, J. C. Gabriel, Wr Frisken, C. W. Darden, C. Fukunaga, P. M. Patel, J. Stiewe, V. Ryltsov, H. Seywerd, S. Weseler, Viktor Matveev, G. Kernel, A. Yagil, V. Tchistilin, J. A. Parsons, Anton Babaev, H. Kapitza, A. Drescher, J. C. Yun, H. Schröder, Yu. Zaitsev, D. Kamp, K. W. Edwards, B. Boŝtjanĉiĉ, A. Semenov, K. R. Schubert, V. Soloshenko, D. J. Gilkinson, I. Tichmirov, H. Scheck, I. Lembke-Koppitz, H. Albrecht, J. D. Swain, R. Wurth, V. Nagovitsin, V. Shevchenko, G. Harder, P. Padley, R. Kutchke, J. D. Prentice, and A. W. Nilsson
Subjects: Physics, Argus, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Branching fraction, High Energy Physics::Phenomenology, Elementary particle, High Energy Physics::Experiment, Atomic physics, Quantum field theory, Engineering (miscellaneous), computer, computer.programming_language, Bar (unit)
Abstract: The decay $$D^0 \to \bar K^0 \phi $$ has been investigated using data accumulated by the ARGUS experiment, which operates at around 10 GeV centre-of-mass energies The decay $$D^0 \to \bar K^0 \phi $$ is a signature for flavor annihilation byW-exchange in weak decays. It is shown that this decay occurs at (15.5±3.3)% of the rate for the well established decay $$D^0 \to \bar K^0 \phi $$ π + π −. This translates into a branching ratio for $$D^0 \to \bar K^0 \phi $$ of (1.18±0.25±0.17)%
Published: 1987
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22. Charged-particle multiplicity distributions and rescattering effects in pd interactions at 19 GeV/c

Author: B. Sellden, E. Sundell, H. Gennow, J. Mäkelä, V. Bakken, M. Pimiä, Jorma Tuominiemi, and P. Lundborg
Subjects: Nuclear physics, Physics, Large Hadron Collider, 010308 nuclear & particles physics, 0103 physical sciences, Bubble chamber, Multiplicity (chemistry), Atomic physics, 010306 general physics, 01 natural sciences, Scaling, Charged particle, Multiplicity distribution
Abstract: Inelastic topological pd cross-sections at 19 GeV/c have been determined from an exposure of the CERN 2 m bubble chamber. The total cross-section for three or more prongs was measured to be (42.4±0.3) mb. The pn charge multiplicity distribution was determined from the data by taking into account rescattering, which was found to constitute (18.5±1.5)% of the above cross-section. The average pn charge multiplicity 〈nc〉 and the average over the dispersion, 〈nc〉/D were found to be 3.53±0.12 and 1.88±0.06, respectively. This latter value indicates by comparison with results at high energies that the pn multiplicity distribution fulfills KNO scaling earlier than the corresponding pp distribution. It is found that available pn data in the energy range (12÷300) GeV fit the modified KNO scaling function of Buraset al. if a value of α of 0.39 is used.
Published: 1979
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23. Muon pairs and upper limit for upsilon production by 280 GeV muons

Author: I.A. Savin, A. Milsztajn, L. Monari, H. Gennow, G. Smadja, Č. Zupančič, D. Jamnik, J.F. Renardy, U. Meyer-Berkhout, Yu.T. Kiryushin, Victor Kukhtin, M.G. Shafranova, J. Strachota, N.D. Gagunashvili, R. Kopp, Francesco Navarria, M. Goossens, A.A. Komar, Dante Bollini, J. Feltesse, M. Bozzo, Alberto Benvenuti, S.P. Baranov, Rene Brun, A. Staude, R. Tirler, P. Verrecchia, V.F. Grushin, L. Piemontese, E.V. Telyukov, R. Voss, D. Schinzel, A.G. Volodko, P. L. Frabetti, J. Maillard, K. M. Teichert, D.Yu. Bardin, Igor Golutvin, G. Heiman, J.M. Malasoma, A.A. Shikanjan, M. Virchaux, V.G. Krivokhizhin, F. Navach, and Y. Sacquin
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Hadron, Continuum (design consultancy), Nuclear physics, Pair production, High mass, High Energy Physics::Experiment, Production (computer science), Limit (mathematics), Nuclear Experiment, Nucleon, Particle Physics - Experiment
Abstract: The high mass μ + μ − pairs produced by 280 GeV μ + on a carbon target are studied in a search for the Y production. The high mass continuum in the region 2–18 GeV is interpreted in terms of QED pair production and of μ pairs originating from the decay of hidden and open charm particles as well as of hadrons ( π , K) from deep inelastic interactions. The upper limit for the upsilon production by muons is found to be, at the 90% confidence level, σ γ ·(γ→μ + μ − ) −39 cm 2 /nucleon.
Published: 1982
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24. On the nature of the cross channel isospin amplitudes for the reaction pN→NNπ in the energy range (6÷1480) GeVin the energy range (6÷1480) GeV

Author: B. Sellden, E. Sundell, M. Pimiä, G. Skjevling, H. Gennow, J. Mäkelä, J. D. Hansen, P. Lundborg, and V. Bakken
Subjects: Physics, Particle physics, Range (particle radiation), Isovector, 010308 nuclear & particles physics, Isoscalar, Momentum transfer, Interference (wave propagation), 01 natural sciences, Nuclear physics, Pomeron, Amplitude, Isospin, 0103 physical sciences, 010306 general physics
Abstract: The reactionN1N2→N3(N4π) is analysed in terms of three isospin amplitudesMIIx whereIxandI are the isospins of the exchanged particle and theN4π combination, respectively. The amplitudes are studied as functions of the momentum transfer to and the mass of theN4π system. The energy dependence is investigated for different mass intervals. The result is that further support is gained for the hypothesis that the isoscalar amplitudeM12/0 is dominated by pomeron exchange compared to previous analyses. To describe the mass dependence of the isovector amplitudeM11/2 and also its interference with the isoscalar amplitude, it seems necessary to interpret this amplitude as a mixture of ρ and π exchanges in the crossed channel. The energy dependence of all amplitudes as functions of theN4π mass becomes slightly weaker for higher masses.
Published: 1978
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25. Branching ratio and mass spectrum of the decay ϒ′ → ϒπ+π−

Author: R. S. Orr, A. Philipp, V. Nagovitsin, V. Lubimov, K. R. Schubert, S. Weseler, D. Wegener, V. Sopov, Yu. Zaitsev, J. Spengler, W. Schmidt-Parzefall, D. Coppage, Viktor Matveev, A. Markees, H. Schröder, R. Davis, C. W. Darden, K. W. Edwards, R. Ammar, J. Stiewe, P. C. H. Kim, A. Arefiev, V. Tchistilin, V. Tchernyshev, Wr Frisken, H. Albrecht, Roland Waldi, R. Childers, Y. Oku, R. Wurth, V. Shevchenco, R. Heller, H. Gennow, H. Hasemann, P. Böckmann, P. M. Patel, M. Goddard, I. Tichomirov, J. D. Prentice, C. Fukunaga, G. Drews, B. Gräwe, H. Seywerd, A. Drescher, F. Selonke, Mikhail Danilov, T. S. Yoon, V. Soloshenko, Werner Hofmann, Holger Schulz, Yu. Semenov, U. Matthiesen, N. Kwak, and Leif J. Jönsson
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Branching fraction, Electron–positron annihilation, Mass spectrum, Analytical chemistry, Matrix element, Invariant mass, computer, computer.programming_language
Abstract: The reaction e + e − → ϒ ′ → ϒπ + π − , with ϒ → anything, has been measured using the ARGUS detector at DORIS . We obtain a mass difference M ( ϒ ′) − M ( ϒ ) = (562 ± 3) MeV and a decay branching ratio BR( ϒ ′→ ϒπ + π − )=(17.9±0.9±2.1)%. The invariant mass spectrum of the π + π − system differs from phase space, but is well described by a matrix element of the form ( M ππ 2 − λM π 2 ) with λ =2.6±0.5. We also report preliminary results on the exclusive decay ϒ′ → ϒπ + π − , with ϒ → e + e − , and obtain BR( ϒ → e + e − ) = (2.8 ± 0.4 ± 04±0.3)%.
Published: 1984
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26. Evidence for F∗ meson production in e+e− annihilation at 10 GeV center-of-mass energy

Author: Robert K. Kutschke, A. Philipp, P. C. H. Kim, J. Spengler, Wr Frisken, G. Drews, P. Böckmann, D. Wegener, V. Nagovitsin, B. J. Stacey, C. W. Darden, Leif J. Jönsson, K. R. Schubert, D. Coppage, H. Seywerd, M. Danilov, S. Weseler, Roland Waldi, F. Selonke, A. Drescher, J. C. Yun, Y. Oku, J. D. Prentice, R. Wurth, P. M. Patel, V. Lubimov, H. Gennow, A. W. Nilsson, H. D. Schulz, V. Sopov, T. S. Yoon, W. Schmidt-Parzefall, R. Heller, Yu. Semenov, K. W. McLean, I. Tichomirov, J. A. McKenna, R. Ammar, D. B. MacFarlane, H. Scheck, K. W. Edwards, S. Kanekal, U. Matthiesen, Raymond Davis, R. Childers, H. Schröder, H. Hasemann, Yu. Zaitsev, M. Goddard, H. Albrecht, V. Matveev, V. Soloshenko, N. Kwak, V. Shevchenco, B. Gräwe, G. Harder, P. Padley, R. S. Orr, J. Stiewe, C. Fukunaga, and V. Ryltsov
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Argus, Photon, Meson production, Annihilation, Meson, High Energy Physics::Lattice, Electron–positron annihilation, High Energy Physics::Phenomenology, Nuclear Theory, Resonance, Nuclear physics, High Energy Physics::Experiment, Center of mass, Nuclear Experiment, computer, computer.programming_language
Abstract: Using the ARGUS detector at DORIS we have obtained evidence for a resonance which decays into an F meson and a photon. The observed mass is 2109 ± 9 ± 7 MeV, which is 144 ± 9 ± 7 MeV greater than the F meson mass. Its properties are consistent with those of the F ∗ meson with J P = 1 − .
Published: 1984
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27. Reconstruction of B mesons

Author: R. S. Orr, K. W. Edwards, J. Spengler, B. Spaan, Leif J. Jönsson, D. Wegener, K. Strahl, J. A. Parsons, Georgios Tsipolitis, A. Golutvin, Robert K. Kutschke, G. Harder, P. Padley, V. Shevchenko, M. Pleško, H. Kapitza, D. Coppage, J. D. Prentice, A. W. Nilsson, I. Tichomirov, V. Matveev, Wr Frisken, K. W. McLean, G. Kernel, Holger Schulz, Anton Babaev, V. Tchistilin, J. A. McKenna, R. Davis, U. Matthiesen, J. P. Donker, D. Kamp, V. Lubimov, D. B. MacFarlane, A. Semenov, S. Kanekal, Y. Oku, N. Kwak, W. Schmidt-Parzefall, I. V. Gorelov, J. D. Swain, V. Soloshenko, C. W. Darden, K. R. Schubert, U. Binder, V. Nagovitsin, M. Danilov, Doug Gingrich, R. Childers, S. Weseler, Roland Waldi, J. C. Gabriel, D. J. Gilkinson, R. Gläser, H. Schröder, P. M. Patel, P. Böckmann, H. Gennow, J. Stiewe, B. Boštjančič, R. Ammar, A. Drescher, J. C. Yun, A. Yagil, P. C. H. Kim, H. Seywerd, T. S. Yoon, V. Ryltsov, Yu. Zaitzev, H. Scheck, I. Lembke-Koppitz, H. Albrecht, and R. Wurth
Subjects: Physics, Nuclear and High Energy Physics, Crystallography, Argus, Electron–positron annihilation, B meson, DESY, Atomic physics, computer, computer.programming_language
Abstract: B mesons have been reconstructed in five decay channels of the type B →D ∗ ±nπ(n=1,2,3) using data accumulated by the ARGUS experiment at the e + e − storage ring DORIS II at DESY. In total, we find 40 neutral B mesons above a background of 15±6 events with a mass of (5278.2±1.0±3.0) MeV/ c 2 and 32 charged B mesons above a background of 17±6 events with a mass of (5275.8±1.3±3.0) MeV/ c 2 . The decays B 0 D ∗+ π − π 0 , B 0 D ∗+ π − π − π + , and B − → D ∗+ π − π − π 0 have been observed for the first time. We find substantially smaller branching ratios for the decay modes B 0 → D ∗+ π − and B − → D ∗+ π − π − than previously published by the CLEO collaboration.
Published: 1987
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28. A determination of the muon pair branching ratio of the γ' meson

Author: K. W. Edwards, D. Wegener, H. Schröder, N. Kwak, P. Böckmann, V. Shevchenko, K. W. McLean, J. A. McKenna, A. Philipp, V. Soloshenko, D. B. MacFarlane, J. Spengler, B. Gräwe, C. W. Darden, G. Harder, D. Coppage, S. Weseler, P. Padley, W. Schmidt-Parzefall, Robert K. Kutschke, H.D. Schulz, J. D. Prentice, A. W. Nilsson, Wr Frisken, R. Childers, D. M. Gingrich, J. Stiewe, T. S. Yoon, Raymond Davis, H. Scheck, V. Lubimov, R. Wurth, Y. Oku, H. Gennow, U. Binder, M. Goddard, H. Hasemann, A. Drescher, J. C. Yun, A. Semenov, N. N. Brown, P. C. H. Kim, H. Albrecht, Yu. Zaitsev, K. R. Schubert, C. Fukunaga, R. Heller, V. Matveev, R. S. Orr, V. Nagovitsin, H. Seywerd, V. Sopov, I. Tichomirov, Leif J. Jönsson, B. J. Stacey, M. Danilov, Roland Waldi, P. M. Patel, R. Ammar, V. Ryltsov, D. J. Gilkinson, Yu. Semenov, S. Kanekal, and U. Matthiesen
Subjects: Physics, Argus, Particle physics, Muon, Luminosity (scattering theory), Physics and Astronomy (miscellaneous), Meson, Branching fraction, Electron–positron annihilation, Nuclear physics, Engineering (miscellaneous), computer, Storage ring, computer.programming_language
Abstract: Using the ARGUS detector at thee+e− storage ring DORIS-II, we have observed the decays of γ(9,460) andΥ'(10,023) into muon pairs. The ratio of the two observed rates determines Bμμ(γ') largely independent of acceptance uncertainties and absolute luminosity calibration, ifBμμ(γ) is known. From data with an integrated luminosity of 6.11/pb on the γ and 9.93/pb on the γ, using the present world averageBμμ(γ)=(2.9±0.2)%, we obtainBμμ(γ)=(1.57±0.59±0.68)%.
Published: 1985
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29. Upper limit for the emission of monoenergetic photons in γ(1S)- and γ(2S)-meson decays

Author: B. Gräwe, R. S. Orr, G. Harder, H. Scheck, P. Padley, I. Lembke-Koppitz, H. Schröder, J. D. Prentice, A. W. Nilsson, H. Albrecht, V. Sopov, R. Wurth, H. Kapitza, T. S. Yoon, R. Ammar, N. Kwak, B. J. Stacey, Viktor Matveev, G. Kernel, Leif J. Jönsson, Robert K. Kutschke, A. Semenov, U. Binder, A. Golutvin, N. N. Brown, I. Tichomirov, Wr Frisken, Y. Zaitsev, Y. Oku, V. Soloshenko, C. Fukunaga, Mikhail Danilov, H. Gennow, A. Drescher, J. C. Yun, Doug Gingrich, R. Davis, J. Stiewe, D. B. MacFarlane, M. Pleško, Roland Waldi, D. J. Gilkinson, P. C. H. Kim, Holger Schulz, R. Childers, P. M. Patel, V. Ryltsov, K. W. Edwards, A. Philipp, V. Lubimov, S. Weseler, S. Kanekal, U. Matthiesen, K. R. Schubert, J. Spengler, W. Schmidt-Parzefall, D. Coppage, H. Seywerd, Anton Babaev, C. W. Darden, M. Goddard, V. Shevchenko, K. W. McLean, J. A. McKenna, D. Wegener, and V. Nagovitsin
Subjects: Physics, Argus, Photon, Physics and Astronomy (miscellaneous), Meson, Physics::Instrumentation and Detectors, Electron–positron annihilation, Detector, Beam tube, Nuclear physics, Energy interval, High Energy Physics::Experiment, Limit (mathematics), Atomic physics, Nuclear Experiment, Engineering (miscellaneous), computer, computer.programming_language
Abstract: We report the results of a search for monoenergetic photons in the decay of both theY(1S)- and theY(2S)-meson. Photons converted in the beam tube or the drift chamber inner wall, and photons detected with the barrel shower counters of the ARGUS detector, respectively, have been used in the analysis. No narrow peak is observed in the energy interval 0.5 GeV≦Ey≦4.0 GeV.
Published: 1985
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30. An upper limit on the mass of the tau neutrino

Author: S. Kanekal, Anton Babaev, A. Philipp, T. S. Yoon, M. Goddard, V. Soloshenko, N. Kwak, H. Schröder, W. Schmidt-Parzefall, D. Coppage, J. Spengler, C. W. Darden, D. Wegener, H. Scheck, H. Albrecht, B. J. Stacey, Leif J. Jönsson, A. Drescher, J. C. Yun, V. Lyubimov, G. Kernel, H.D. Schulz, V. Shevchenko, R. Childers, A. Semenov, P. C. H. Kim, R. Ammar, R. Wurth, Robert K. Kutschke, Douglas Gingrich, M. Danilov, K. R. Schubert, Roland Waldi, K. W. McLean, U. Matthiesen, I. Tikhomirov, D. J. Gilkinson, William R. Frisken, J. A. McKenna, R. S. Orr, D. B. Macfarlane, P. M. Patel, S. Weseler, V. Nagovitsyn, M. Pleško, K. W. Edwards, A. Golutvin, Yu. Zaitsev, R. Davis, J. D. Prentice, A. W. Nilsson, Y. Oku, B. Gräwe, G. Harder, V. Ryltsov, H. Gennow, B.Paul Padley, U. Binder, C. Fukunaga, J. Stiewe, H. C. J. Seywerd, V. Matveev, V. Sopov, and N. N. Brown
Subjects: Physics, Nuclear and High Energy Physics, Argus, Particle physics, Electron–positron annihilation, Detector, Nuclear physics, Tau neutrino, Energy spectrum, High Energy Physics::Experiment, Limit (mathematics), computer, Storage ring, computer.programming_language, Lepton
Abstract: Using the ARGUS detector at the e+e− storage ring DORIS II, we have measured the vτ energy spectrum in the decay π+π−π±vτ of τ leptons produced near s =10 GeV . From this energy spectrum, we derive an upper limit of m(v τ ) MeV c 2 at the 95% confidence level.
Published: 1985
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31. Observation of antideuteron production in electron-positron annihilation at 10 GeV center of mass energy

Author: Roland Waldi, J. Spengler, B. J. Stacey, Viktor Matveev, G. Kernel, J. Stiewe, R. Davis, H. Gennow, D. Coppage, Holger Schulz, H. Hasemann, M. Goddard, Yu. Semenov, I. Tichomirov, K. W. McLean, Leif J. Jönsson, H. C. J. Seywerd, D. J. Gilkinson, N. N. Brown, U. Matthiesen, J. A. McKenna, S. Kanekal, Mikhail Danilov, V. Nagovitsin, A. Philipp, V. Lubimov, P. Böckmann, N. Kwak, W. Schmidt-Parzefall, D. Wegener, R. S. Orr, V. Soloshenko, M. Pleško, B. Gräwe, C. W. Darden, G. Harder, U. Binder, V. Sopov, R. Ammar, P. Padley, Douglas Gingrich, A. Semenov, William R. Frisken, D. B. Macfarlane, C. Fukunaga, J. D. Prentice, S. Weseler, A. W. Nilsson, Robert K. Kutschke, Y. Oku, R. Childers, R. Heller, H. Schröder, P. M. Patel, Yu. Zaitsev, H. Scheck, H. Albrecht, R. Wurth, V. Shevchenko, V. Ryltsov, K. R. Schubert, K. W. Edwards, A. Drescher, J. C. Yun, T. S. Yoon, and P. C. H. Kim
Subjects: Physics, Nuclear and High Energy Physics, Argus, Range (particle radiation), Particle physics, Electron–positron annihilation, Detector, Hadron, Nuclear physics, Momentum, High Energy Physics::Experiment, Center of mass, Nuclear Experiment, computer, Event (particle physics), computer.programming_language
Abstract: The production of antideuterons has been observed in electron-positron annihilations at center-of-mass energies around 10 GeV. Antideuterons have been identified unambiguously by their energy loss in the drift chamber, their time-of-flight and the pattern of their energy deposition in the shower counters of the ARGUS detector. The production rate in the momentum range (0.6−1.8) GeV/ c is (1.6 −0.7 +1.0 ) × 10 −5 per hadronic event.
Published: 1985
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32. Isospin analysis of single ϱ and f0 production in pN collisions in the energy range 7–24 GeV

Author: Y. Eisenberg, T. Jacobsen, J.E. Olsson, B. Sellden, E.E. Ronat, U. Karshon, V. Bakken, A. Shapira, D. Hochman, G. Yekutieli, E. Sundell, H. Gennow, J. Mäkelä, P. Lundborg, M. Pimiä, and R. Møllerud
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Amplitude, Isospin, Diagram, Production (computer science), Energy (signal processing)
Abstract: New data on the reactions pp → ppϱ0, pn → pnϱ0, pn → ppϱ−, pp → ppf0, and pn → pnf0 at 7, 11.6 and 19 GeV/c are used to study the reactions pN → NNϱ and pN → NNf0 in terms of isospin amplitudes. In the ϱ case there are three such amplitudes MI1I2 where I1 and I2 are the isospins of the exchanges in a double peripheral diagram. The result is that the amplitude with I1 = 1 and I2 = 0 is dominating. The properties of this amplitude are such that it is likely to be dominated by the pair of exchanges ϱ + η. In the f0 case there are only two amplitudes. It is found that the I1 = I2 = 0 amplitude is larger than the I1 = I2 = 1 amplitude and that it has an energy dependence such that it could be dominated by the pair of exchanges η + η.
Published: 1977
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33. Search for lepton-number and lepton-flavour violation in tau decays

Author: J. D. Prentice, A. W. Nilsson, K. W. Edwards, G. Tsipolitis, Leif J. Jönsson, B. Boštjančič, M. Danilov, K. Strahl, I. V. Gorelov, J. D. Swain, H. Albrecht, D. Coppage, U. Binder, Roland Waldi, N. Kwak, W. Schmidt-Parzefall, V. Soloshenko, S. Kanekal, J. C. Gabriel, G. Harder, V. Lubimov, R. Davis, C. W. Darden, P. Böckmann, H. Gennow, D. Kamp, D. Wegener, V. Matveev, P. Padley, D. J. Gilkinson, R. Ammar, H. Kapitza, V. Shevchenko, J. Stiewe, J. A. Parsons, Douglas Gingrich, J. P. Donker, A. Yagil, K. W. McLean, Y. Oku, K. R. Schubert, R. S. Orr, J. A. McKenna, P. M. Patel, H. Scheck, H. C. J. Seywerd, I. Lembke-Koppitz, H.D. Schulz, J. Spengler, A. Semenov, Yu. Zaitsev, R. Wurth, U. Matthiesen, R. Childers, G. Kernel, V. Tchistilin, William R. Frisken, D. B. Macfarlane, S. Weseler, Robert K. Kutschke, M. Pleško, A. Golutvin, B. Spaan, Anton Babaev, R. Gläser, I. Tichomirov, V. Ryltsov, T. S. Yoon, P. C. H. Kim, V. Nagovitsin, A. Drescher, J. C. Yun, and H. Schröder
Subjects: Physics, Nuclear and High Energy Physics, Argus, Particle physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Flavour, Lepton number, Charged particle, Nuclear physics, High Energy Physics::Experiment, computer, Storage ring, Order of magnitude, computer.programming_language, Lepton
Abstract: We have searched for neutrinoless tau decays into three charged particles as evidence for lepton-flavour or lepton-number violation. The data were collected using the ARGUS detector at the DORIS II storage ring. Tau pairs were produced by e + e − annhilation at centre-of-mass energies near 10 GeV. No evidence for lepton-number or lepton-flavour violation was observed, but the upper limits obtained are an order of magnitude lower than those previously published.
Published: 1987
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34. Direct evidence for W exchange in charmed meson decay

Author: H. Gennow, M. Goddard, B. Gräwe, G. Harder, P. Padley, H.D. Schulz, J. D. Prentice, A. W. Nilsson, Y. Oku, Leif J. Jönsson, A. Semenov, V. Sopov, Robert K. Kutschke, J. Spengler, D. Wegener, A. Philipp, U. Binder, V. Lubimov, B. J. Stacey, N. Kwak, Anton Babaev, V. Soloshenko, G. Kernel, C. W. Darden, M. Pleško, U. Matthiesen, M. Danilov, H. Schröder, V. Shevchenko, Roland Waldi, I. Tichomirov, C. Fukunaga, N. N. Brown, K. W. McLean, J. A. McKenna, K. R. Schubert, V. Matveev, S. Kanekal, William R. Frisken, W. Schmidt-Parzefall, H. Scheck, D. Coppage, R. Ammar, D. B. Macfarlane, D. J. Gilkinson, V. Ryltsov, S. Weseler, K. W. Edwards, Douglas Gingrich, A. Golutvin, R. Childers, R. S. Orr, R. Wurth, J. Stiewe, P. M. Patel, Yu. Zaitsev, R. Davis, H. C. J. Seywerd, H. Albrecht, T. S. Yoon, A. Drescher, J. C. Yun, P. C. H. Kim, and V. Nagovitsin
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Meson, Branching fraction, Direct evidence, computer, computer.programming_language
Abstract: Using the ARGUS detector at DORIS II, we have observed a signal of 36.7±8.0 events in the decay channel D0→Ks0φ. In the same data sample, we have observed the well established decay D0→Ks0π+π−, and find the ratio, Br(D) 0 → K s 0 φ) Br(D) 0 → K s 0 π + π − ) , to be 0.186±0.052. The substantial value of (0.99±0.32±0.17)% then derived for the branching ratio for D 0 → K 0 φ gives direct evidence that W exchange contributes D0 decay.
Published: 1985
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35. Observation of inclusive DS production in B meson decay

Author: J. Stiewe, N. Kwak, W. Schmidt-Parzefall, C. W. Darden, H. C. J. Seywerd, K. W. Edwards, Robert K. Kutschke, Y. Oku, K. Strahl, D. Coppage, R. Childers, A. Drescher, J. C. Yun, V. Shevchenko, M. Pleško, D. J. Gilkinson, K. R. Schubert, I. V. Gorelov, J. A. Parsons, T. S. Yoon, P. Böckmann, H. Gennow, K. W. McLean, A. Semenov, U. Binder, S. Kanekal, J. A. McKenna, R. Davis, H. Kapitza, William R. Frisken, P. C. H. Kim, J. D. Swain, D. B. Macfarlane, S. Weseler, A. Golutvin, Holger Schulz, I. Tichomirov, D. Kamp, R. Gläser, R. S. Orr, J. P. Donker, H. Scheck, M. Danilov, I. Lembke-Koppitz, U. Matthiesen, Roland Waldi, J. C. Gabriel, H. Albrecht, R. Wurth, H. Schröder, B. Spaan, J. Spengler, J. D. Prentice, A. W. Nilsson, G. Kernel, V. Tchistilin, G. Harder, P. Padley, D. Wegener, Anton Babaev, V. Ryltsov, V. Nagovitsin, V. Matveev, Leif J. Jönsson, R. Ammar, Douglas Gingrich, V. Soloshenko, G. Tsipolitis, B. Boštjančič, A. Yagil, P. M. Patel, Yu. Zaitsev, and V. Lubimov
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Particle physics, Electron–positron annihilation, B meson, computer, Storage ring, computer.programming_language
Abstract: Using the ARGUS detector at the e + e − storage ring DORIS II, we have observed inclusive D S production, using the channel D S − → φπ − , in decays of B mesons produced on the ϒ (4S). The product of branching ratios BR(B→D S X)·BR(D S − → φπ − ) is (4.2±0.9±0.6) × 10 −3 . The D S momentum spectrum suggests a substantial two-body component to the final states of B→D S X decays.
Published: 1987
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36. Contribution from ρ exchange to the reaction $$\bar p{\mathcal{N}} - \bar {\mathcal{N}}({\mathcal{N}}\pi )_{I = \tfrac{1}{2}} $$

Author: H. Gennow
Subjects: Physics, Amplitude, Isovector, Quantum mechanics, Isospin, Order (ring theory), Production (computer science), State (functional analysis), Atomic physics, Nuclear Experiment, Interpretation (model theory), Bar (unit)
Abstract: The results of a cross channel isospin amplitude analysis of the reaction$\bar p{\mathcal{N}} - {\mathcal{N}}{\mathcal{N}}\pi $ at 5.7 GeV/c, concerning the isovector exchange amplitudeM12/1, with the${\mathcal{N}}\pi $ system in anI=1/2 state, have been used to analysis the nature of this amplitude. It is found that, in order to describe the mass dependence of theM12/1 it is necessary to include contributions from both ρ and π exchanges in the crossed channel. Such two-component model can also describe theM12/1 amplitude obtained from single-pion production in both$\pi {\mathcal{N}}$ and$p{\mathcal{N}}$ collisions as shown earlier. It thus seems to exist a common interpretation of this amplitude for all these different reactions.
Published: 1978
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37. Some features of one, two and three pion production in pd collisions at 19 GeV/c

Author: T. Jacobsen, R. Møllerud, G. Skjevling, J.E. Olsson, V. Bakken, E. Sundell, B. Sellden, H. Gennow, P. Lundborg, J. Mäkelä, and M. Pimiä
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Pion, Production (computer science), Nuclear Experiment
Abstract: We present cross sections for coherent and non-coherent production of one, two and three pions in pd reactions at 19 GeV/ c . The mass distributions of the two pion non-coherent channels are studied. Strong single Δ(1236) and also some double Δ production is observed. Clear evidence for ϱ production is seen.
Published: 1977
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38. Measurement of tau decays into three charged pions

Author: Y. Oku, D. Wegener, H. Scheck, M. Pleško, Robert K. Kutschke, I. Lembke-Koppitz, A. Golutvin, V. Lubimov, Wr Frisken, R. Wurth, U. Mattiesen, K. R. Schubert, K. Jönsson, J. D. Prentice, B. Spaan, S. Weseler, A. W. Nilsson, D. B. MacFarlane, H. Kapitza, U. Binder, V. Soloshenko, V. Shevchenko, A. Bahaev, R. Childers, I. Gorelov, J. P. Donker, N. Kwak, D. Coppage, K. W. Edwards, K. Strahl, H. Albrecht, V. Matveev, S. Kanekal, W. Schmidt-Parzefall, R. S. Orr, K. W. McLean, C. Fukunaga, J. A. McKenna, J. Stiewe, H.D. Schulz, G. Harder, A. Semenov, A. Philipp, P. Padley, P. Böckmann, H. Gennow, J. Spengler, D. J. Gilkinson, C. W. Darden, D. Kamp, I. Tichomirov, M. Goddard, R. Gläser, T. S. Yoon, A. Drescher, J. C. Yun, Raymond Davis, P. C. H. Kim, H. Schröder, V. Nagovitsin, R. Ammar, M. Danilov, Roland Waldi, J. C. Gabriel, P. M. Patel, G. Kernel, V. Tchistilin, V. Ryltsov, H. Seywerd, A. Yagil, Yu. Zaitsev, and D. M. Gingrich
Subjects: Physics, Argus, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, Elementary particle, Nuclear physics, Pion, Mass spectrum, Engineering (miscellaneous), computer, Storage ring, computer.programming_language
Abstract: We report a study of the decay τ−→τ−τ+τ−vτ using the ARGUS detector at the DORIS II storage ring. Tau pairs were produced bye+e− annihilation at centre-of-mass energies near 10 GeV. We have observed about 1,700 events, corresponding to a branching ratio for τ−→τ−τ+τ−vτ of (5.6±0.7)%. The dominant mode for this decay is observed to beρ0π− in aJp=1+ spin state. Theρ0π− mass spectrum shows a broad enhancement near 1.10 GeV/c2, which has the properties expected for theA1.
Published: 1986
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39. Neutron dissociation into pπ- at 19 GeV/cat 19 GeV/c

Author: H. Gennow, J. Mäkelä, B. Sellden, P. Lundborg, V. Bakken, T. Jacobsen, M. Pimiä, and E. Sundell
Subjects: Nuclear physics, Baryon, Physics, Diffraction, Pion, Mass distribution, 010308 nuclear & particles physics, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, 01 natural sciences, Dissociation (chemistry)
Abstract: The reaction pn→ppπ at 19 GeV/c is studied. It is dominated by the process where the neutron dissociates into the pπ- system and exhibits the characteristic features of diffraction dissociation. The pπ- mass distribution shows a strong peak at 1.3 GeV but is otherwise rather structureless. By comparison with other experiments we find that this peak is neither seen at higher nor at lower energies. The reason why it is not seen in experiments at higher energies seems to be that they suffer from strong experimental limitations. The 1.3 GeV peak is connected with small momentum transfers and an analysis of the moments of the decay angular distributions shows that this peak is a low-spin phenomenon. For larger momentum transfers the lowest moments show an onset already at threshold. By comparison with a pion exchange Deck model we find a substantial baryon exchange contribution for small momentum transfers. This contribution seems to become more pronounced at higher energies.
Published: 1979
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40. Search for fractionally charged particles produced in e+e− annihilation

Author: V. Lubimov, M. Goddard, N. N. Brown, V. Matveev, H.D. Schulz, H. Scheck, K. R. Schubert, V. Sopov, Leif J. Jönsson, A. Semenov, William R. Frisken, V. Shevchenko, W. Schmidt-Parzefall, D. B. Macfarlane, H. Gennow, S. Weseler, D. Coppage, I. Tichomirov, T. S. Yoon, R. Davis, S. Kanekal, Robert K. Kutschke, K. W. McLean, M. Pleško, D. Wegener, R. Wurth, P. C. H. Kim, M. Danilov, H. Hasemann, K. W. Edwards, Roland Waldi, J. A. McKenna, R. S. Opr, R. Heller, H. Albrecht, V. Nagovitsin, H. Schröder, V. Ryltsov, A. Philipp, J. Spengler, R. Ammar, A. Drescher, J. C. Yun, D. J. Gilkinson, P. Böckmann, Douglas Gingrich, B. J. Stacey, B. Gräwe, G. Harder, G. Kernel, N. Kwak, P. Padley, C. W. Darden, P. M. Patel, V. Soloshenko, J. D. Prentice, A. W. Nilsson, Yu. Zaitsev, Yu. Semenov, U. Matthiesen, R. Childers, J. Stiewe, Y. Oku, H. C. J. Seywerd, U. Binder, and C. Fukunaga
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Cross section (physics), Argus, Particle physics, Annihilation, Electron–positron annihilation, Charge (physics), computer, Storage ring, Charged particle, computer.programming_language
Abstract: A search has been made for particles with charge Q = 1 3 , Q = 2 3 and Q = 4 3 produced in e + e − annihilation using the ARGUS detector at the e + e − storage ring DORIS, operating at a centre of mass energy around 10 GeV. No candidate events were found in 84.5 pb −1 of collected data. Upper limits are established for the cross section for the production of fractionally charged particles with masses up to 4 GeV c 2 , improving on previously obtained limits.
Published: 1985
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41. Antiproton-neutron interactions at 100 GeV/c

Author: Michael S. Webster, G. Ekspong, H. Gennow, P. R. Noble, S. Reucroft, W.H. Evans, J. R. Fry, S. Nilsson, P. Lundborg, E. K. Johansson, J. Norrby, H. Fenker, C. E. Roos, Y. Yamdagni, A. Moreton, and J. Marraffino
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Charged particle, Nuclear physics, Deuterium, Antiproton, Bubble chamber, High Energy Physics::Experiment, Neutron, Multiplicity (chemistry), Nuclear Experiment, Multiplicity distribution
Abstract: From an exposure of the 30-inch deuterium filled bubble chamber to a 100 GeV/ c antiproton-enriched beam at FNAL, we have calculated the topological cross sections for antiproton-neutron interactions with three or more charged particles in the final state. A comparison of our data with pn data at the same momentum allows us to estimate the annihilation contribution to each multiplicity, and hence calculate the average value, and width, of the annihilation multiplicity distribution. Our results are consistent with those from p p data at 100 GeV/ c , but depart from the trend of lower-energy p p data.
Published: 1979
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42. A measurement of the nucleon structure function from muon-carbon deep inelastic scattering at high Q2

Author: Yu.T. Kiryushin, K. M. Teichert, P. L. Frabetti, Rudiger Voss, J. Maillard, R. Tirler, J. Cvach, U. Mieyer-Berkhout, Victor Kukhtin, F. Navach, Rene Brun, G. Smadja, P. Verrecchia, A. Milsztajn, James Pilcher, J. Žáček, Igor Golutvin, G. Heiman, N.G. Fadeev, V.G. Krivokhizhin, G.I. Smirnov, Dante Bollini, J. Feltesse, M. Virchaux, G. Vestergombi, Matthew Henry Klein, D. Schinzel, H. Gennow, I.A. Savin, A.G. Volodko, D. Jamnik, M. Bozzo, J.F. Renardy, M. Goossens, Francesco Navarria, J.M. Malasoma, V. S. Kisselev, R. Kopp, L. Monari, A. Staude, Č. Zupančič, L. Piemontese, W. D. Nowak, Alberto Benvenuti, Tom Dobrowolski, D.Yu. Bardin, and Y. Sacquin
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Large Hadron Collider, Physics::Instrumentation and Detectors, Structure function, chemistry.chemical_element, Inelastic scattering, Deep inelastic scattering, Nuclear physics, chemistry, High Energy Physics::Experiment, Nuclear Experiment, Nucleon, Carbon, Particle Physics - Experiment, Beam (structure)
Abstract: Deep inelastic scattering cross sections have been measured with the CERN SPS muon beam at incident energies of 120 and 200 GeV. Approximately 10000 events at each energy used to obtain the structure function F/sub 2/(x, Q/sup 2/) in the kinematic region 0.3
Published: 1981
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43. Production and decay of the F meson in e+e− annihilation at 10 GeV centre-of-mass energy

Author: J. Stiewe, D. Wegener, M. Goddard, H. Schröder, A. Philipp, A. Markees, Robert K. Kutschke, J. Spengler, Y. Oku, N. N. Brown, I. Tikhomirov, D. J. Gilkinson, H. Gennow, W. Schmidt-Parzefall, D. Coppage, R. S. Orr, V. Soloshenko, B. J. Stacey, A. Drescher, J. C. Yun, B.Paul Padley, C. W. Darden, Viktor Matveev, V. Ryltsov, V. Sopov, H. Scheck, N. Nagovitsyn, Leif J. Jönsson, V. Lyubimov, R. Ammar, D. B. MacFarlane, Doug Gingrich, R. Davis, T. S. Yoon, H. Albrecht, R. Heller, William R. Frisken, R. Childers, R. Wurth, U. Binder, Holger Schulz, Yu. Semenov, F. Selonke, Mikhail Danilov, K. W. McLean, K. W. Edwards, J. A. McKenna, P. M. Patel, S. Kanekal, U. Matthiesen, P. C. H. Kim, V. Shevchenko, C. Fukunaga, A. Semenov, H. Seywerd, Werner Hofmann, Yu. Zaitsev, R. Waldi, G. Drews, J. D. Prentice, A. W. Nilsson, B. Gräwe, G. Harder, N. Kwak, K. R. Schubert, S. Weseler, H. Hasemann, and P. Böckmann
Subjects: Quark, Physics, Nuclear and High Energy Physics, Argus, Annihilation, Meson, Branching fraction, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, Nuclear physics, Momentum, High Energy Physics::Experiment, Center of mass, Nuclear Experiment, computer, computer.programming_language
Abstract: Using the ARGUS detector at DORIS, we have observed the production of F ± mesons in e + e − annihilation at a centre of mass energy of 10 GeV through their subsequent decays into φπ ± and φπ + π − π ± . The values obtained for [ R (e + e − →FX). Branching Ratio] are (1.47 ± 0.32 ± 0.20)% and (1.63 ± 0.42 ± 0.41)% respectively. The observed mass is (1973.6 ± 2.6 ± 3.0) MeV c 2 . The F momentum spectrum is as expected for the fragmentation of c quarks into charmed mesons, but is somewhat softer than for fragmentation into D ∗ mesons. The relevant angular distributions are consistent with a spin-zero assignment of the F meson.
Published: 1985
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44. Production and decay of the charged D∗ meson in e+e− annihilation at 10 GeV centre-of-mass energy

Author: A. Philipp, P. C. H. Kim, N. Kwak, F. Selonke, C. W. Darden, B. Gräwe, V. Shevchenko, G. Harder, H. Gennow, H. Schröder, William R. Frisken, J. Spengler, G. Drews, U. Binder, P. Padley, W. Schmidt-Parzefall, K. W. McLean, B. J. Stacey, J. A. McKenna, D. B. Macfarlane, S. Weseler, R. S. Orr, H. Scheck, R. Ammar, V. Ryltsov, J. D. Prentice, A. W. Nilsson, D. Coppage, C. Fukunaga, H. Albrecht, I. Tichomirov, K. R. Schubert, Robert K. Kutschke, H.D. Schulz, Y. Oku, V. Sopov, R. Wurth, M. Goddard, H. Hasemann, P. M. Patel, R. Davis, R. Heller, Yu. Zaitsev, K. W. Edwards, Leif J. Jönsson, M. Danilov, Roland Waldi, V. Matveev, V. Lubimov, S. Kanekal, V. Soloshenko, J. Stiewe, H. C. J. Seywerd, N. Nagovitsin, D. Wegener, Yu. Semenov, U. Matthiesen, P. Böckmann, R. Childers, T. S. Yoon, A. Drescher, and J. C. Yun
Subjects: Physics, Nuclear and High Energy Physics, Particle decay, Pion, Pair production, Meson, Branching fraction, Electron–positron annihilation, D meson, Analytical chemistry, Mass spectrum, Atomic physics
Abstract: Using the ARGUS detector at DORIS we have observed the prediction of the charged D ∗ meson in e + e − annihilation at a center of mass energy of 10 GeV. The D ∗ fragmentation function has been measured using the decay channels D ∗+ → D 0 π + and D 0 → K − π + and K − π + π + π − . We find σ·Br for the channels D 0 → K − π + and D 0 → K − π + π + π − to be (23.6 ± 2.2 ± 4.7) pb and (51.0 ± 4.6 ± 15.5) pb respectively, and the ratio of branching ratios Br(D 0 → K − π + π + π − )/Br(D 0 → K − π + ) = 2.17 ± 0.28 ± 0.23. In addition we measure the mass difference M( D ∗+ ) − M( D 0 ) to be (145.46 ± 0.07 ± 0.03) MeV, and set an upper limit for D 0 − D 0 mixing of 0.11.
Published: 1985
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45. Measurement of the interference structure function xG3(x) in muon-nucleon scattering

Author: K. M. Teichert, Victor Kukhtin, H. Vogt, Francesco Navarria, V. S. Kisselev, J.F. Renardy, P.T. Todorov, L. Piemontese, M. Virchaux, J. Strachota, M. Goossens, Yu.T. Kiryushin, M. Bozzo, L. Monari, P. Rich-Hennion, Igor Golutvin, A. Ouraou, Tiziano Camporesi, Konrad Deiters, Č. Zupančič, A. Staude, W. D. Nowak, R. Voss, D. Jamnik, U. Meyer-Berkhout, Matthew Henry Klein, G. Sultanov, A. Argento, N.G. Fadeev, J. Cvach, V.G. Krivokhizhin, Y. Sacquin, H. Gennow, R. Kopp, G. Heiman, J. Feltesse, G.I. Smirnov, R. Tirler, A. Kondor, Alberto Benvenuti, G. Smadja, P. Verrecchia, A.G. Volodko, D.Yu. Bardin, Gyorgy Vesztergombi, I.A. Savin, M. Cribier, A. Milsztajn, J. Žáček, D. Bollini, and G. Bruni
Subjects: Quark, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Muon, Scattering, Electroweak interaction, Parton, Nucleon, Helicity, Particle Physics - Experiment, Sign (mathematics)
Abstract: The interference structure function xG 3 ( x ) has been measured for the first time scattering positive and negative muons of opposite helicity off a carbon target. The x dependence observed for Q 2 between 40 and 180 (GeV/c 2 ) is in good agreement with predictions of the quark-parton model. The measured ratio 2( a u Q u + a d Q d )/( Q u 2 + Q d 2 = 1.87 ± 0.25 (stat.) ± 0.24 (syst.) is consistent with the hypothesis of fractional quark charges and determines the sign of Q u − Q d to be positive.
Published: 1984

46. Upper limits on D0-D0 mixing and BB production from muon-nucleon scattering

Author: M. Bozzo, Tiziano Camporesi, G. Smadja, A.A. Shikanyan, G.I. Smirnov, J. Strachota, G. Heiman, L. Monari, Ahmimed Ouraou, D. Jamnik, W. D. Nowak, P. Rich-Hennion, Č. Zupančič, Dante Bollini, J. Feltesse, A.G. Volodko, N.G. Fadeev, Francesco Navarria, U. Meyer-Berkhout, Y. Sacquin, A. Milsztajn, Victor Kukhtin, S.P. Baranov, Igor Golutvin, V.G. Krivokhizhin, N.D. Gagunashvili, V.F. Grushin, E.V. Telyukov, K. M. Teichert, H. Gennow, Alberto Benvenuti, M. Goosens, R. Tirler, P. Verrecchia, M. Virchaux, M. Cribier, I.A. Savin, A.A. Komar, J.F. Renardy, R. Kopp, Gyorgy Vesztergombi, A. Argento, A. Staude, D.Yu. Bardin, L. Piemontese, G. Bruni, and Rudiger Voss
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Cross section (physics), Particle physics, Pair production, Muon, Scattering, Nucleon, Mixing (physics)
Abstract: In deep inelastic interactions of 200 GeV muons with a carbon target, we have found 17 events of the type μ ± N→ μ ± μ ∓ μ ∓ X (“wrong-sign” dimuons). We derive upper limits of 1.2% (90% CL) on D 0 - D 0 transitions (mixing) or, alternatively, of 9 pb (90% CL) cross section for B B pair production as possible sources of such events.
Published: 1985

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