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1. Evidence for Λc(2593)+ production

Author: D. O. Litvintsev, R. Mundt, C. Frankl, B. Spaan, H. Thurn, Ruslan Chistov, P. Pakhlov, V. Eiges, R. Waldi, R. P. Hofmann, P. R.B. Saull, D. B. MacFarlane, Sebastian Nowak, D. Wegener, J. Spengler, T. Siegmund, A. Snizhko, W. Schmidt-Parzefall, T. Oest, M. Schramm, H. Kapitza, H. Kuipers, A. Nau, I. Korolko, Michael Schneider, Holger Schulz, Peter Krieger, Sergey Semenov, M. Bracko, G. Kernel, Hermann Kolanoski, H. Wegener, S. Weseler, T. Živko, H. Schröder, T. S. Yoon, R. Schwierz, T. Podobnik, G. Medin, O. Igonkina, Klaus R. Schubert, K. T. Knöpfle, Ivan Belyaev, L. Gershtein, Sergey Barsuk, J.D. Prentice, A. Lindner, M. Schieber, C. Hast, Thomas Hamacher, S. Werner, J. Graf, K. Tzamariudaki, D. Töpfer, A. Lange, M. Walter, R. G. Van de Water, O. Mai, A. Rohde, R. Eckmann, Yu. Zaitsev, K. Reim, H. Albrecht, R. Mankel, R. Wurth, T. Kirchhoff, E. Križnič, P. Križan, A. Golutvin, Yu. Gershtein, J. Stiewe, D. Reßing, I. Tichomirov, M. Schmidtler, A. Hüpper, Vladislav Balagura, Mikhail Danilov, A. Kosche, Werner Hofmann, K. Ehret, G. Kostina, and R. Reiner
Subjects: Baryon, Physics, Nuclear and High Energy Physics, Argus, Electron–positron annihilation, Excited state, DESY, Atomic physics, computer, computer.programming_language
Abstract: Using the ARGUS detector at the e+e− storage ring DORIS II at DESY, we have found evidence for the production of the excited charmed baryon state Λc(2593)+ in the channel Λc+π+π−. Its mass was determined to be (2594.6±0.9±0.4) MeV/c2, and the natural width measured to be Γ = (2.9−2.1−1.4+2.9+1.8) MeV. The production cross section times the branching ratios of σ(e+e− → Λc(2593)+X) × Br(Λc(2593)+ → Λc+π+π−) × Br(Λc+ → pK−π+) was measured to be (0.25−0.13+0.24 ±0.13) pb. The fractions of Λc(2593)+ decays proceeding through the Σc0π+ and Σc++π− channels were determined to be 0.29±0.10±0.11 and 0.37±0.12±0.13, respectively.
Published: 1997
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2. Two measurements of mixing using kaon tagging

Author: H. Wegener, R. Schwierz, R. G. Van de Water, T. Podobnik, H. Albrecht, J. Spengler, A. Hüpper, T. S. Yoon, R. Mankel, Klaus R. Schubert, R. Waldi, W. Schmidt-Parzefall, R. Wurth, R. Mundt, O. Igonkina, R. P. Hofmann, H. Kuipers, Yu. Gershtein, J. Stiewe, C. Frankl, Ivan Belyaev, A. Nau, S. Werner, C. Hast, Michael Schneider, D. Reßing, Sergey Semenov, G. Kernel, Hermann Kolanoski, M. Walter, H. Thurn, J. D. Prentice, T. Oest, R. Chistov, I. Tichomirov, A. Lange, Sebastian Nowak, J. Graf, K. Ehret, L. Gershtein, D. Wegener, D. Töpfer, P. Eckstein, O. Mai, I. Korolko, D. O. Litvintsev, M. Schramm, Vladislav Balagura, T. Kirchhoff, V. Eiges, B. Spaan, P. Krieger, M. Schieber, H. Kapitza, P. Pakhlov, G. Kostina, Thomas Hamacher, Axel Lindner, K. Reim, M. Schmidtler, R. Reiner, H. Schröder, Mikhail Danilov, R. Eckmann, Yu. Zaitsev, Holger Schulz, A. Kosche, K. T. Knöpfle, E. Križnič, T. Živko, Werner Hofmann, S. Weseler, D. B. Macfarlane, P. R. B. Saull, P. Križan, A. Golutvin, T. Siegmund, K. Tzamariudaki, and A. Snizhko
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Branching fraction, Electron–positron annihilation, DESY, Multiplicity (mathematics), computer, Mixing (physics), computer.programming_language
Abstract: Using the ARGUS detector at the e+e− storage ring DORIS II at DESY, we have made two measurements of the mixing parameter χd using kaons as flavour tags. Using D∗+ K± correlations we found χd = 0.20 ± 0.13 ± 0.12 and from the study of (D∗+l−) K± correlations we obtained χd = 0.19 ± 0.07 ± 0.09. The branching ratio for B → D∗+ X has been updated: Br(B → D∗+ X) = (19.6 ± 1.9)%. We have also determined the average multiplicity of charged kaons in B0 decays to be 0.78 ± 0.08.
Published: 1996
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3. Two-photon production of ω pairs

Author: Sebastian Nowak, D. Wegener, Mikhail Danilov, J. Spengler, T. Siegmund, M. Schramm, A. Kosche, R. Mundt, Axel Lindner, K. Ehret, C. Frankl, G. Kernel, R. Chistov, G. Kostina, Ivan Belyaev, R. Reiner, Werner Hofmann, A. Lange, I. Korolko, I. Tichomirov, H. Thurn, T. Oest, W. Schmidt-Parzefall, J. Stiewe, O. Mai, T. S. Yoon, O. Igonkina, D. Reßing, K. T. Knöpfle, J. Graf, V. Eiges, Klaus R. Schubert, H. Kuipers, D. Töpfer, Holger Schulz, P. R. B. Saull, A. Hüpper, H. Wegener, M. Schieber, T. Živko, R. P. Hofmann, T. Podobnik, H. Kapitza, K. Reim, Yu. Gershtein, P. Pakhlov, M. Schmidtler, R. Waldi, S. Weseler, R. G. Van de Water, C. Hast, Michael Schneider, A. Nau, Sergey Semenov, Hermann Kolanoski, Vladislav Balagura, L. Gershtein, Thomas Hamacher, P. Eckstein, R. Schwierz, D. O. Litvintsev, B. Spaan, H. Schröder, M. Walter, S. Werner, Sergey Barsuk, H. Albrecht, R. Mankel, R. Wurth, J. D. Prentice, P. Krieger, T. Kirchhoff, R. Eckmann, Yu. Zaitsev, K. Tzamariudaki, A. Snizhko, E. Križnič, D. B. Macfarlane, P. Križan, and A. Golutvin
Subjects: Physics, Nuclear and High Energy Physics, Cross section (physics), Argus, Two-photon excitation microscopy, Value (computer science), Production (computer science), Maximum likelihood analysis, Atomic physics, computer, Omega, computer.programming_language
Abstract: A maximum likelihood analysis of ARGUS data on two-photon production of π+π+π0π0π−π− is presented. A small fraction of events is due to the production of omega pairs. The γγ → ωω cross section has its maximum value close to threshold.
Published: 1996
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4. The ARGUS vertex trigger

Author: T. Siegmund, N. Koch, P. Eckstein, J. Bergter, R. Waldi, M. Kolander, U. Weiss, D. Ressing, K. R. Schubert, S. Weseler, Hermann Kolanoski, and M. Imhof
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Argus, Vertex (computer graphics), FOS: Physical sciences, Radius, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Level trigger, Instrumentation, computer, Random access, computer.programming_language
Abstract: A fast second level trigger has been developed for the ARGUS experiment which recognizes tracks originating from the interaction region. The processor compares the hits in the ARGUS Micro Vertex Drift Chamber to 245760 masks stored in random access memories. The masks which are fully defined in three dimensions are able to reject tracks originating in the wall of the narrow beampipe of 10.5\,mm radius., gzipped Postscript, 27 pages
Published: 1996
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5. Measurement of the semileptonic branching fractions of the D0 meson

Author: I. Korolko, A. Snizhko, R. G. Van de Water, S. Weseler, Yu. Gershtein, J. Stiewe, R. Waldi, P. R. B. Saull, D. Reßing, M. Schieber, Ivan Belyaev, T. Oest, Klaus R. Schubert, A. Lindner, R. Mundt, M. Walter, J. Graf, D. Töpfer, R. Schwierz, C. Frankl, Mikhail Danilov, Michael Schneider, H. Kapitza, Olga Igonkina, M. Schmidtler, H. Wegener, J. Spengler, T. Siegmund, T. Podobnik, D. O. Litvintsev, H. Thurn, Sebastian Nowak, A. Kosche, T. S. Yoon, B. Spaan, G. Kernel, R. Chistov, P. Pakhlov, D. Wegener, V. Eiges, W. Schmidt-Parzefall, Werner Hofmann, I. Tichomirov, Vladislav Balagura, M. Schramm, L. Gershtein, P. Eckstein, Thomas Hamacher, K. Tzamariudaki, H. Kuipers, A. Nau, Sergey Semenov, Holger Schulz, Hermann Kolanoski, K. T. Knöpfle, H. Schröder, K. Reim, T. Živko, A. Hüpper, R. P. Hofmann, R. Eckmann, Yu. Zaitsev, T. Kirchhoff, S. Werner, H. Albrecht, R. Mankel, R. Wurth, Sergey Barsuk, C. Hast, A. Lange, O. Mai, E. Križnič, P. Krieger, J. D. Prentice, D. B. Macfarlane, P. Križan, A. Golutvin, K. Ehret, G. Kostina, and R. Reiner
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Annihilation, Meson, Branching fraction, Hadron, Analytical chemistry, Branching (polymer chemistry), computer, Particle Physics - Experiment, computer.programming_language
Abstract: Using the ARGUS detector at the e + e − storage ring DORIS II, we have measured the semileptonic branching ratios of the D 0 meson to be Br ( D 0 → e + ν e X ) = (6.9 ± 0.3 ± 0.5) % and Br ( D 0 → μ + ν μ X ) = (6.0 ± 0.7 ± 1.2) %, and the semileptonic branching ratio of the charmed hadron mixture from e + e − annihilation around 10 GeV to be Br ( c → e + ν e X ) = (9.6 ± 0.4 ± 1.1) %.
Published: 1996
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6. A measurement of the electronic widths Γ ee of the ϒ(1S), ϒ(2S), and ϒ(4S) resonances, and of the total decay width Γ of the ϒ(4S)

Author: R. P. Hofmann, S. Werner, P. Pakhlov, Ivan Belyaev, P. R. B. Saull, A. Snizhko, A. Hüpper, Peter Krieger, H. Wegener, T. Kirchhoff, Michael Schneider, Sebastian Nowak, D. Wegener, R. Schwierz, T. Podobnik, J. Spengler, A. Nau, Sergey Semenov, R. G. Van de Water, I. Korolko, H. Kapitza, D. Töpfer, Holger Schulz, C. Hast, T. Siegmund, A. Lindner, A. Lange, Hermann Kolanoski, M. Walter, P. Križan, W. Schmidt-Parzefall, A. Golutvin, G. Kernel, R. Chistov, M. Schmidtler, T. Živko, O. Mai, M. Schramm, R. Mundt, H. Schröder, H. Kuipers, Thomas Hamacher, T. Oest, M. Schieber, L. Gershtein, E. Križnič, H. Albrecht, R. Mankel, R. Wurth, K. Tzamariudaki, H. Thurn, P. Eckstein, Mikhail Danilov, D. O. Litvintsev, Vladislav Balagura, A. Kosche, K. T. Knöpfle, R. Waldi, T. S. Yoon, R. Eckmann, Werner Hofmann, Klaus R. Schubert, I. Tichomirov, Yu. Zaitsev, B. Spaan, W. Funk, J. D. Prentice, K. Reim, C. Frankl, S. Weseler, Yu. Gershtein, J. Stiewe, D. Reßing, Sergey Barsuk, K. Ehret, G. Kostina, R. Reiner, and D. B. MacFarlane
Subjects: Physics, Argus, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Resonance, Elementary particle, DESY, Electron, Nuclear physics, Radiative transfer, Atomic physics, Engineering (miscellaneous), computer, Storage ring, computer.programming_language
Abstract: The partial decay width into electrons, Γ ee , of the ϒ(1S) and ϒ(2S) resonances have been measured with the detector ARGUS at thee+e− storage ring DORISII of DESY. Applying the formula of Kuraev and Fadin for the radiative corrections we find: Γ ee (ϒ(1S))= (1.32±0.04±0.03) keV and Γ ee (ϒ(2S))=(0.52±0.03±0.01) keV. The total decay width of the ϒ(4S) resonance and its partial width into electrons have been determined as well. Fitting the data with a generalized Breit-Wigner function with an energy dependent decay width Γ(s) and a mass shift functionm(s), we obtain the following resonance parameters: Γ(M2)=(10.0±2.8±2.7) MeV, Γ ee =(0.28±0.05±0.01)keV andB ee =(2.77±0.50±0.49)·10−5. We argue that the disagrecment of this result with the world average originates from our more adequate parametrization of the observed ϒ(4S) resonance cross section.
Published: 1995
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7. Measurement of the decay D* s2 + (2573) → D0K+

Author: J. Spengler, K. Ehret, T. Siegmund, S. Weseler, Lnn Tichomirov, Axel Lindner, D. Reßing, Sebastian Nowak, K. Reim, G. Kernel, Holger Schulz, D. Wegener, T. S. Yoon, H. Schröder, A. Lange, T. Kirchhoff, J. Graf, Thomas Hamacher, D. Töpfer, D. B. MacFarlane, W. Schmidt-Parzefall, O. Mai, I. Korolko, E. Križnič, M. Schramm, T. Živko, G. Kostina, M. Schmidtler, R. Waldi, R. P. Hofmann, P. R.B. Saull, Yu. Gershtein, R. Mundt, R. Reiner, K. T. Knöpfle, H. Albrecht, C. Frankl, J.D. Prentice, R. Mankel, R. Wurth, H. Kuipers, M. Schieber, H. Thurn, K. Tzamariudaki, Vladislav Balagura, Mikhail Danilov, I. Bleyaev, K. R. Schubert, H. Kapitza, P. Pakhlov, V. Eiges, Peter Krieger, A. Snizhko, R. Eckmann, P. Križan, A. Golutvin, Yu. Zaitsev, A. Kosche, R. G. Van de Walter, Werner Hofmann, A. Hüpper, L. Gershtein, C. Hast, Michael Schneider, Ruslan Chistov, Sergey Barsuk, R. Schwierz, T. Oest, H. Wegener, T. Podobnik, A. Nau, Sergey Semenov, Hermann Kolanoski, P. Eckstein, D. O. Litvintsev, B. Spaan, and M. Walter
Subjects: Nuclear physics, Physics, Cross section (physics), Argus, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Detector, Value (computer science), DESY, computer, Storage ring, computer.programming_language
Abstract: Using the ARGUS detector at the e+e− storage ring DORIS II at DESY we have measured the parameters of a charmed strange meson D* s2 + (2573) decaying into D0K+. The mass of this state was found to be (2574.5±3.3±1.6) MeV/c 2. The measured value of its width is (10.4±8.3±3.0) MeV and the product of the production cross section and branching ratio for this channel was determined to be (10.6±4.2 −1.2 +2.3 ) pb.
Published: 1995
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8. Measurement of the decay fractions ofD * mesons

Author: A. Hüpper, T. Siegmund, V. Lubimov, J. D. Prentice, C. Frankl, R. Waldi, D. O. Litvintsev, Sebastian Nowak, D. Wegener, C. Hast, A. Lange, O. Mai, B. Spaan, H. Kapitza, I. Tichomirov, M. Schramm, Ivan Belyaev, G. Kostina, Manfred Paulini, I. Korolko, R. Schwierz, D. B. MacFarlane, P. Križan, Alexander Undrus, A. Golutvin, Mikhail Danilov, D. Töpfer, Michael Schneider, A. Kosche, Yuri Gershtein, A. Droutskoy, Klaus R. Schubert, K. Tzamariudaki, Vladimir Blinov, Peter Krieger, Werner Hofmann, H. Albrecht, R. Mankel, R. Wurth, R. Reiner, A. Snizhko, M. Schieber, R. Mundt, T. S. Yoon, P. Eckstein, Thomas Hamacher, P. R. B. Saull, R. P. Hofmann, H. Thurn, R. Eckmann, Yu. Zaitsev, S. Werner, E. Križnič, S. Chechelnitsky, T. Kirchhoff, R. G. Van de Water, M. Walter, P. Pakhlov, S. Khan, J. Stiewe, K. Ehret, K. T. Knöpfle, D. Reßing, H. Schröder, J. Spengler, G. Kernel, Holger Schulz, T. Živko, V. Zhilich, W. Schmidt-Parzefall, H. Kuipers, A. Nau, Sergey Semenov, Hermann Kolanoski, H. Wegener, T. Podobnik, A. Lindner, C. Ratz, T. Oest, K. Reim, S. Weseler, H. Ehrlichmann, M. Schmidtler, and Vladislav Balagura
Subjects: Physics, Argus, Nuclear magnetic resonance, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Analytical chemistry, Engineering (miscellaneous), computer, computer.programming_language
Abstract: Using the ARGUS detector at the DORIS II electron-positron storage ring at DESY, we have measured BR(D*+→D0π+)=(68.8±2.4±1.3)%, BR(D*+→D+π0)=(31.2±1.1±0.8)%, BR(D*+→D+γ)
Published: 1995
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9. The first measurement of the Michel parameter η in τ decays

Author: Mikhail Danilov, Ivan Belyaev, G. Kostina, Klaus R. Schubert, T. S. Yoon, R. Schwierz, S. Weseler, A. Nau, Sergey Semenov, D. O. Litvintsev, R. Reiner, A. Kosche, Yuri Gershtein, B. Spaan, Hermann Kolanoski, D. Töpfer, I. Korolko, P. Pakhlov, P. Eckstein, H. Schröder, R. P. Hofmann, P. R.B. Saull, V. Lubimov, T. Siegmund, Werner Hofmann, Sebastian Nowak, D. Wegener, M. Schmidtler, R. G. Van de Water, I. Tichomirov, J. Stiewe, H. Wegener, K. T. Knöpfle, S. Chechelnitsky, R. Mundt, D. Reßing, P. Krieger, K. Ehret, A. Snizhko, C. Hast, H. Thurn, T. Podobnik, J. Spengler, Michael Schneider, E. Križnič, H. Kapitza, A. Hüpper, D. B. MacFarlane, Holger Schulz, K. Reim, J. D. Prentice, R. Waldi, Axel Lindner, T. Živko, A. Droutskoy, G. Kernel, A. Lange, C. Frankl, M. Walter, T. Oest, O. Mai, M. Schieber, R. Eckmann, Thomas Hamacher, Yu. Zaitsev, S. Werner, K. Tzamariudaki, P. Križan, A. Golutvin, W. Schmidt-Parzefall, Vladislav Balagura, H. Kuipers, T. Kirchhoff, H. Albrecht, R. Mankel, and R. Wurth
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Argus, Electron–positron annihilation, Hadron, DESY, Spectral line, Vertex (geometry), Nuclear physics, High Energy Physics::Experiment, computer, Storage ring, computer.programming_language, Lepton
Abstract: Using the ARGUS detector at the e+e - storage ring DORIS II at DESY, we have studied lepton energy spectra in ~- decays. We present a "pseudo-rest-frame" technique in which the second r in the event, decaying into a heavy hadronic system, is used as reference. This method allows for the first measurement of the Michel Parameter 7/in ~- decays. We also determine the Michel Parameter p in 7" --~ e~u decays with a precision comparable to the present world average. The measured values of the parameters p = 0.735 4- 0.036 4- 0.020 and r 1 = 0.03 4- 0.18 4- 0.12 are in good agreement with standard V-A coupling at the ~--~,-W vertex.
Published: 1995
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10. Evidence for W-exchange in charmed baryon decays

Author: S. Werner, D. O. Litvintsev, H. Schröder, Vladislav Balagura, B. Spaan, M. Walter, H. Wegener, Klaus R. Schubert, P. Krieger, T. Podobnik, I. Tichomirov, V. Lubimov, R. Waldi, M. Schieber, R. Mundt, I. Korolko, G. Kostina, H. Albrecht, R. Mankel, R. Wurth, P. R. B. Saull, Sebastian Nowak, D. Wegener, P. Križan, A. Golutvin, P. Eckstein, H. Thurn, Axel Lindner, Thomas Hamacher, S. Weseler, R. Schwierz, R. Reiner, Sally Seidel, H. Kapitza, A. Hüpper, T. Oest, Ivan Belyaev, Holger Schulz, J. D. Prentice, E. Križnič, A. Nau, Sergey Semenov, J. Stiewe, W. Schmidt-Parzefall, A. Snizhko, C. Frankl, R. P. Hofmann, S. Chechelnitsky, Hermann Kolanoski, K. Ehret, M. Schmidtler, H. Kuipers, C. E. K. Charlesworth, D. Töpfer, K. T. Knöpfle, T. Živko, T. Kirchhoff, D. B. Macfarlane, Mikhail Danilov, U. Becker, A. Droutskoy, D. Reßing, P. Pakhlov, T. Siegmund, J. Spengler, A. Kosche, A. Lange, G. Kernel, P. Eckmanm, K. Reim, O. Mai, Werner Hofmann, C. Hast, Michael Schneider, Yu. Zaitsev, Yu. Gershtein, T. S. Yoon, R. G. Van de Water, and K. Tzamariudaki
Subjects: Nuclear physics, Physics, Baryon, Nuclear and High Energy Physics, Argus, Particle physics, Branching fraction, Electron–positron annihilation, Mass spectrum, DESY, computer, computer.programming_language
Abstract: Using the detector ARGUS at the e+e− storage ring DORIS II at DESY, we have observed the decays Λc+ → Ξ−K+π+ and Λc+ → Ξ∗0K+ and obtained evidence for the decay Ξc0 → ΛKs0. All three of these decays are of interest as they provide information about W-exchange processes. The products of cross sections and branching ratios for Λc+ → Ξ−K+π+ and Λc+ → Ξ∗0K+ are (1.7±0.3±0.3) pb and (0.6±0.2±0.1) pb, respectively, which implies that (35±17) % of the Ξ−K+π+ final state is generated through a two-body decay via intermediate W-exchange. The product of production cross section and branching ratio for Ξc0 → Λ Ks0 is (2.1 ± 1.0 ± 0.6) pb.
Published: 1995
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11. Measurement of the polarization in the decay

Author: A. Snizhko, Holger Schulz, W. Schmidt-Parzefall, H. Kapitza, T. Živko, Ivan Belyaev, K. Tzamariudaki, H. Kuipers, R. Mundt, D. Töpfer, Yu. Gershtein, S. Weseler, R. G. Van de Water, Mikhail Danilov, L. Gershtein, H. Thurn, J. Stiewe, M. Schieber, Sebastian Nowak, T. Siegmund, R. Waldi, A. Droutskoy, D. Wegener, I. Korolko, E. Križnič, A. Kosche, G. Kostina, P. Pakhlov, M. Schramm, A. Lange, T. Kirchhoff, D. B. Macfarlane, Werner Hofmann, A. Hüpper, K. Reim, H. Wegener, T. Podobnik, R. Reiner, O. Mai, Vladislav Balagura, T. S. Yoon, K. T. Knöpfle, Axel Lindner, S. Barsuk, C. Hast, Michael Schneider, R. Chistov, I. Tichomirov, Klaus R. Schubert, D. Reβing, A. Nau, Sergey Semenov, H. Albrecht, R. Mankel, Hermann Kolanoski, J. Spengler, R. Wurth, T. Oest, P. R. B. Saull, P. Križan, A. Golutvin, M. Schmidtler, G. Kernel, Thomas Hamacher, K. Ehret, R. Schwierz, D. O. Litvintsev, B. Spaan, P. Eckstein, H. Schröder, M. Walter, R. P. Hofmann, P. Krieger, J. D. Prentice, C. Frankl, S. Werner, R. Eckmann, and Yu. Zaitsev
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Particle physics, Electron–positron annihilation, CP violation, Polarization (waves), computer, Storage ring, computer.programming_language
Abstract: Polarization in the exclusive decay B → J/ψK ∗ was measured using the ARGUS detector at the e+e− storage ring DORIS II. The ratio of the transverse to the total decay width was found to be ΓT/Γ = 0.03±0.16±0.15. This measurement demonstrates that the B 0 → J/ψK ∗0 decay channel can be effectively used for CP violation studies.
Published: 1994
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12. Measurement of the absolute branching fractions for D0 decays into

Author: Sebastian Nowak, D. Wegener, M. Walter, R. Schwierz, V. Lubimov, E. Gershtein, M. Schieber, M. Schmidtler, T. Oest, W. Schmidt-Parzefall, I. Korolko, G. Kernel, Klaus R. Schubert, R. Eckmann, Yu. Zaitsev, H. Schröder, H. Kuipers, H. Wegener, C. Hast, S. Werner, T. Kirchhoff, R. G. Van de Water, T. Podobnik, A. Lange, S. Barsuk, G. Kostina, A. Lindner, R. Waldi, T. Siegmund, D. O. Litvintsev, O. Mai, Michael Schneider, Vladislav Balagura, Mikhail Danilov, John D. Spengler, T. S. Yoon, B. Spaan, Thomas Hamacher, H. Albrecht, R. Reiner, R. Mankel, R. Wurth, P. Pakhlov, K. T. Knöpfle, P. R. B. Saull, H. Kapitza, P. Eckstein, K. Ehret, R. P. Hofmann, M. Schram, Ivan Belyaev, A. Kosche, D. Töpfer, A. Droutskoy, Werner Hofmann, I. Tichomirov, Holger Schulz, A. Nau, Sergey Semenov, Hermann Kolanoski, A. Hüpper, T. Živko, K. Tzamariudaki, R. Mundt, A. Snizhko, H. Thurn, J. Stiewe, D. Reβing, K. Reim, Yu. Gershtein, S. Weseler, P. Krieger, J. D. Prentice, C. Frankl, E. Križnič, D. B. Macfarlane, P. Križan, and A. Golutvin
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Argus, Crystallography, Angular distribution, Meson, Electron–positron annihilation, Branching (polymer chemistry), computer, computer.programming_language
Abstract: Using the ARGUS detector at the e+ e− storage ring DORIS II we have measured the absolute branching ratios of the D0 meson, Br(D0→K− π+)=(3.41±0.12±0.28)%, Br(D0→K− π+ π+ π−)=(6.80± 0.27±0.57)%, and Br (D 0 → K 0 π + π − )=(5.03±0.39±0.49)% .
Published: 1994
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13. Determination of the radiative decay width of the η meson

Author: I. Korolko, Klaus R. Schubert, K. Reim, Sebastian Nowak, Mikhail Danilov, A. Hüpper, D. Wegener, A. Kosche, J. Spengler, Werner Hofmann, G. Kostina, R. Mundt, A. Nau, Sergey Semenov, T. Oest, K. Tzamariudaki, H. Albrecht, Thomas Hamacher, Hermann Kolanoski, R. Mankel, R. Wurth, Yu. Gershtein, M. Schramm, S. Werner, R. Reiner, T. S. Yoon, H. Thurn, P. Kržan, A. Snizhko, P. Eckstein, H. Kapitza, H. Wegener, V. Lubimov, S. Weseler, P. Pakhlov, M. Walter, D. O. Litvintsev, D. Reβing, P. Krieger, Ivan Belyaev, T. Podobnik, G. Kernel, B. Spaan, J. Stiewe, J. D. Prentice, R. G. Van de Water, C. Frankl, D. Töpfer, Axel Lindner, Holger Schulz, R. P. Hofmann, C. Hast, Michael Schneider, T. Kirchhoff, S. Chechelnitsky, R. Schwierz, M. Schmidtler, T. Živko, R. Waldi, M. Schieber, K. Ehret, A. Droutskoy, H. Schröder, R. Eckmann, Yu. Zaitsev, K. T. Knöpfle, A. Golutvin, E. Križnič, D. B. Macfarlane, Vladislav Balagura, A. Lange, O. Mai, W. Schmidt-Parzefall, H. Kuipers, P. R. B. Saull, T. Siegmund, and I. Tichomirov
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Argus, Meson, Branching fraction, Radiative decay, Mass spectrum, Value (computer science), Atomic physics, computer, computer.programming_language
Abstract: An analysis of the reaction yy ~ r/c was l~erformed in five different decay channels of the r/c: /~sK+~r ~, K+K-Tr+~ "- , 27r+21r -, ~b~b and 2K+2K -. A value Fry(r/c) = ( 11.3 + 4.2) keV was obtained for the radiative decay width by combining the results from the first four channels. Using our result on the two-photon width we also determined the branching ratio for the decay r/c --~ 2K+2K -.
Published: 1994
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14. Study ofD 0 andD + decays into final states with two or three kaons

Author: C. Hast, P. R. B. Saull, S. Weseler, T. Siegmund, I. Korolko, V. Lubimov, P. Križan, A. Golutvin, R. Schwierz, Klaus R. Schubert, R. Waldi, G. Kostina, A. Lange, O. Mai, M. Schmidtler, E. Križnič, Sebastian Nowak, D. B. MacFarlane, R. Mundt, D. Wegener, I. Tichomirov, R. Chistov, D. O. Litvintsev, H. Wegener, A. Droutskoy, R. Reiner, J. D. Prentice, A. Lindner, A. Snizhko, B. Spaan, C. Frankl, T. Podobnik, H. Thurn, M. Schramm, R. Eckmann, Yu. Zaitsev, K. Reim, Vladislav Balagura, A. Hüpper, P. Pakhlov, Ivan Belyaev, R. P. Hofmann, T. S. Yoon, P. Eckstein, T. Oest, S. Chechelnitsky, D. Töpfer, Peter Krieger, K. Tzamariudaki, Mikhail Danilov, K. Ehret, Holger Schulz, A. Kosche, T. Živko, Werner Hofmann, R. G. Van de Water, John D. Spengler, H. Albrecht, R. Mankel, R. Wurth, T. Kirchhoff, H. Kapitza, K. T. Knöpfle, Thomas Hamacher, A. Nau, Sergey Semenov, Hermann Kolanoski, W. Schmidt-Parzefall, M. Walter, G. Kernel, H. Kuipers, M. Schieber, H. Schröder, Yu. Gershtein, S. Barsuk, Michael Schneider, J. Stiewe, D. Reßing, and S. Werner
Subjects: Physics, Argus, Particle physics, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Model prediction, Elementary particle, Nuclear physics, Field theory (psychology), Quantum field theory, Engineering (miscellaneous), computer, Storage ring, computer.programming_language
Abstract: Using the ARGUS detector at thee+e− storage ring DORIS II, we have studied Cabibbo-suppressedD0 decay modes resulting in theK+K−π+π− final state and two-bodyD0 decay modes with a ϕ meson in the final state. TheBR(D0→KS0KS0π+π− was measured for the first time. We also present a measurement of theD+→KS0KS0K+ branching ratio. The values are compared with other experimental results and model predictions.
Published: 1994
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15. Reconstruction of the decay B− → D10(2414) π−

Author: M. Walter, Holger Schulz, S. Chechelnitsky, H. Wegener, T. Podobnik, Michael Schneider, J. Stiewe, K. T. Knöpfle, K. Ehret, I. Tichomirov, Klaus R. Schubert, M. Schieber, T. Živko, T. Oest, R. Schwierz, G. Kostina, John D. Spengler, V. Lubimov, A. Lindner, H. Albrecht, R. Mankel, Sebastian Nowak, I. Korolko, Mikhail Danilov, R. Mundt, R. P. Hofmann, R. Wurth, D. Wegener, H. Schröder, G. Kernel, K. Reim, A. Kosche, P. Križan, A. Golutvin, H. Thurn, P. R. B. Saull, T. Kirchhoff, Vladislav Balagura, W. Schmidt-Parzefall, Werner Hofmann, A. Hüpper, P. Pakhlov, C. Hast, A. Droutskoy, Yu. Gershtein, T. Siegmund, T. S. Yoon, S. Weseler, K. Tzamariudaki, H. Kuipers, A. Nau, Sergey Semenov, A. Lange, R. Eckmann, Hermann Kolanoski, Yu. Zaitsev, A. Snizhko, D. Reβing, P. Eckstein, D. O. Litvintsev, R. G. Van de Water, B. Spaan, M. Schmidtler, S. Werner, Ivan Belyaev, E. Križnič, D. B. Macfarlane, D. Töpfer, R. Waldi, O. Mai, H. Kapitza, Thomas Hamacher, J. D. Prentice, C. Frankl, R. Reiner, and P. Krieger
Subjects: Physics, Nuclear and High Energy Physics, Argus, Meson, Excited state, Analytical chemistry, Atomic physics, computer, computer.programming_language
Abstract: We present the results of a partial reconstruction of the decay channel B − → D j (∗) π − performed using the ARGUS detector operating at the e+e− storage-ring DORIS II. In the context of this paper, D j (∗)0 is an L = 1 excited charm meson decaying to D ∗+ π − . The measured product of branching ratios is Br(B − → D 1 0 (2414)π − ) · Br Br(D 1 0 → D ∗+ π − ) = (0.17 ± 0.05 ± 0.04)% where the first error is statistical and statistical and the second systematic. No evidence for the decay B − → D 2 ∗0 (2459) π − ) · Br(D 2 ∗0 → D ∗+ π − ) at the 90% confidence level.
Published: 1994
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16. Kaons in flavour taggedB decays

Author: K. T. Knöpfle, V. Lubimov, A. Nau, Sergey Semenov, J. Spengler, G. Kernel, Hermann Kolanoski, H. I. Cronström, J. D. Prentice, M. Schieber, M. Walter, Dave Britton, J. Stiewe, P. M. Patel, Ivan Belyaev, A. Hüpper, D. O. Litvintsev, H. Albrecht, E. Križnič, H. Schröder, P. Pakhlov, Manfred Paulini, R. Wurth, B. Spaan, W. Funk, R. Waldi, D. Reßing, Sebastian Nowak, D. Wegener, R. P. Hofmann, T. S. Yoon, Leif J. Jönsson, S. Werner, Fedor Ratnikov, M. Bittner, K. Tzamariudaki, T. Kirchhoff, Michael Schneider, Peter Krieger, T. Oest, D. B. MacFarlane, C. Hast, D. Töpfer, K. Strahl, Vladislav Balagura, P. Eckstein, M. Seeger, A. Droutskoy, W. Schmidt-Parzefall, H. Wegener, A. Lange, P. R. B. Saull, I. Tichomirov, Thomas Hamacher, Yu. Zaitsev, V. Soloshenko, T. Podobnik, Yu. Gershtein, C. E. K. Charlesworth, A. Snizhko, Holger Schulz, A. Lindner, T. Siegmund, E.R.F. Hyatt, R. G. Van de Water, K. W. Edwards, P. Križan, A. Golutvin, S. Khan, T. Živko, Mikhail Danilov, H. Kapitza, A. Kosche, Werner Hofmann, R. Mundt, H. Thurn, S. Weseler, H. Ehrlichmann, M. Schmidtler, K. Reim, Rainer Mankel, K. R. Schubert, S. Chechelnitsky, K. Ehret, G. Kostina, and R. Reiner
Subjects: Physics, Particle physics, Argus, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Flavour, Nuclear physics, Angular distribution, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), computer, Storage ring, Lepton, computer.programming_language
Abstract: Using the ARGUS detector at thee+e− storage ring DORIS II, flavour-dependent kaon production inB meson decays has been studied. Using the leptons as flavour tags, it has been possible to separately measure the multiplicities ofK+,K− andKs0 in inclusiveB decays and in semileptonicB decays. The kaon production in semileptonicB decays was further used to estimate the ratio of charmed decays over all decays, and thus also the fraction of charmlessB decays.
Published: 1994
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17. Observation of γγ → φϱ0 and γγ → φω

Author: H. Wegener, T. Podobnik, V. Lubimov, Sebastian Nowak, I. Korolko, D. Wegener, T. Oest, D. O. Litvintsev, T. Siegmund, C. E.K. Charlesworth, M. Schieber, A. Hüpper, M. Walter, John D. Spengler, D. B. MacFarlane, K. Reim, S. Chechelnitsky, K. Tzamariudaki, Michael Schneider, P. Krieger, B. Spaan, P. Pakhlov, K. Ehret, H. Kapitza, E. Križan, H. Albrecht, R. Mankel, A. Droutskoy, R. Wurth, W. Schmidt-Parzefall, G. Kernel, A. Nau, C. Franki, C. Hast, R. Mundt, Sergey Semenov, Vladislav Balagura, M. Seeger, R. Eckmann, K. W. Edwards, R. Schwierz, A. Lange, H. Schröder, Yu. Zaitsev, S. Werner, T. Kirchhoff, Klaus R. Schubert, Hermann Kolanoski, R. P. Hofmann, P. R.B. Saull, G. Kostina, Thomas Hamacher, H. Thurn, Manfred Paulini, Dave Britton, I. Tichomirov, R. Reiner, P.M. Patel, R. Waldi, R. G. Van de Water, Holger Schulz, S. Khan, T. S. Yoon, E. R.F. Hyatt, A. Lindner, T. Živko, P. Eckstein, Ivan Belyaev, Mikhail Danilov, D. Töpfer, A. Kosche, Yuri Gershtein, A. Snizhko, Werner Hofmann, K. T. Knöpfle, J. D. Prentice, M. Schmidtler, J. Stiewe, D. Reßing, S. Weseler, H. Ehrlichmann, P. Križan, and A. Golutvin
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Argus, Hadron, DESY, computer, Storage ring, computer.programming_language
Abstract: Two-photon production of the hadronic final states K + K − π + π − and K + K − π + π 0 π − has been studied using the ARGUS detector at the e + e − storage ring DORIS II at DESY. The cross sections of the reactions γγ → oϱ 0 and γγ → oω have been measured for the first time. In addition, angular distrubutions have been determined for the reaction γγ → oϱ 0 → K + K − π + π − .
Published: 1994
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18. Observation of polarization effects in Λc+ semileptonic decay

Author: R. Waldi, I. Korolko, C. Hast, S. Weseler, M. Seeger, A. Lange, Mikhail Danilov, Sebastian Nowak, D. Wegener, O. Mai, H. Ehrlichmann, Holger Schulz, A. Kosche, Ivan Belyaev, H. Kapitza, H. Wegener, R. Eckmann, D. Töpfer, Yu. Gershtein, H. Albrecht, Yu. Zaitsev, S. Werner, Klaus R. Schubert, Thomas Hamacher, H. Kuipers, Werner Hofmann, M. Schmidtler, R. Mankel, J. Stiewe, I. Tichomirov, R. Wurth, K. Tzamariudaki, T. Živko, Michael Schneider, T. Podobnik, P. R. B. Saull, P. Krieger, P. Pakhlov, R. P. Hofmann, T. Kirchhoff, V. Lubimov, J. D. Prentice, T. Siegmund, G. Kostina, D. Reβing, K. Reim, C. Frankl, T. Oest, R. Mundt, R. Reiner, A. Hüpper, H. Thurn, A. Snizhko, A. Nau, Sergey Semenov, S. Chechelnitsky, Hermann Kolanoski, K. Ehret, Vladislav Balagura, A. Droutskoy, P. Križan, H. Schröder, A. Golutvin, M. Walter, P. Eckstein, E. Križnič, D. B. Macfarlane, R. Schwierz, D. O. Litvintsev, W. Schnidt-Parzefall, B. Spaan, T. S. Yoon, J. Spengler, G. Kernel, M. Schieber, R. G. Van de Water, A. Lindner, S. Khan, and K. T. Knöpfle
Subjects: Physics, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, Argus, media_common.quotation_subject, Electron–positron annihilation, Elementary particle, Polarization (waves), Asymmetry, Baryon, Nuclear physics, Particle decay, computer, media_common, computer.programming_language
Abstract: Polarization of the Λ daughter baryon from Λc+ → Λl+ vl decay has been measured for the first time using the ARGUS detector at the DORIS II ϵ+ϵ− storage ring. Expressed in terms of the Λc+ semileptonic asymmetry parameter the result is αΛc= −0.91±0.49 for events in the mass region 1.85
Published: 1994
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19. Observation of a new charmed baryon

Author: P. Krieger, J. D. Prentice, R. Waldi, K. W. Edwards, K. T. Knöpfle, Ivan Belyaev, A. Hüpper, I. Korolko, E. Križnič, P. R. B. Saull, K. Tzamariudaki, K. Strahl, R. Mundt, Vladislav Balagura, V. Lubimov, B. Spaan, J. Stiewe, H. Thurn, K. R. Schubert, A. Snizhko, T. Siegmund, S. Chechelnitsky, Sebastian Nowak, H. Schröder, S. Werner, D. Wegener, D. Töpfer, D. B. Macfarlane, Dmitry Litvintsev, M. Bittner, K. Reim, Thomas Hamacher, H. Wegener, G. Kernel, Dave Britton, K. Ehret, T. Podobnik, H. Kapitza, Holger Schulz, E.R.F. Hyatt, I. Tichomirov, M. Schieber, W. Schmidt-Parzefall, M. Walter, A. Nau, Rainer Mankel, Sergey Semenov, Manfred Paulini, P. M. Patel, Hermann Kolanoski, S. Weseler, C. Hast, C. E. K. Charlesworth, T. Živko, P. Križan, A. Golutvin, R. Eckmann, Yu. Zaitsev, M. Seeger, R. P. Hofmann, H. Ehrlichmann, A. Lange, G. Kostina, T. Kirchhoff, P. Pakhlov, John D. Spengler, M. Schmidtler, R. Reiner, Yu. Gershtein, A. Lindner, Mikhail Danilov, Michael Schneider, H. Albrecht, R. Wurth, A. Droutskoy, A. Kosche, D. Reβing, Werner Hofmann, T. Oest, P. Eckstein, T. S. Yoon, R. G. Van de Water, and S. Khan
Subjects: Nuclear physics, Physics, Baryon, Nuclear and High Energy Physics, Argus, Branching fraction, Electron–positron annihilation, Elementary particle, Charge (physics), DESY, computer, Storage ring, computer.programming_language
Abstract: Using the ARGUS detector at the e+e− storage ring DORIS II at DESY, we have observed a new charmed baryon state in the channel Λc+π+π−. (All references to a specific charged state also imply the charge conjugate state.) The mass of this state was measured to be (2626.6 ± 0.5 ± 1.5) MeV/c2. The product of the production cross section and branching ratio for this channel was determined to be (11.5 ± 2.5 ± 3.0) pb, and the natural width estimated to be smaller than 3.2 MeV/c2 at 90% CL.
Published: 1993
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20. A determination of two Michel parameters in purely leptonic tau decays

Author: D. Reβing, Yu. Gershtein, V. Lubimov, A. Nau, Sergey Semenov, Hermann Kolanoski, K. Reim, Rainer Mankel, K. T. Knöpfle, H. Schröder, S. Weseler, Dave Britton, T. S. Yoon, J. D. Prentice, K. Strahl, Vladislav Balagura, H. Ehrlichmann, C. Hast, H. Kapitza, M. Seeger, A. Lange, M. Schmidtler, A. Lindner, Michael Schneider, M. Schieber, P. Krieger, E.R.F. Hyatt, M. Walter, Andreas Kirchhoff, Ivan Belyaev, R. Waldi, A. Droutskoy, R. Mundt, P. Eckstein, D. O. Litvintsev, D. Töpfer, B. Spaan, W. Funk, H. Thurn, R. G. Van de Water, Holger Schulz, S. Khan, G. Kernel, P. R. B. Saull, T. Živko, Thomas Hamacher, V. Soloshenko, T. Siegmund, P. Pakhlov, R. P. Hofmann, K. R. Schubert, Manfred Paulini, S. Chechelnitsky, K. Tzamariudaki, K. Ehret, W. Schmidt-Parzefall, G. Kostina, C. E. K. Charlesworth, R. Reiner, H. Wegener, P. M. Patel, I. Tichomirov, R. Eckmann, Yu. Zaitsev, T. Podobnik, S. Werner, M. Bittner, A. Hüpper, Fedor Ratnikov, T. Oest, Mikhail Danilov, A. Kosche, Werner Hofmann, A. Snizhko, John D. Spengler, H. Albrecht, R. Wurth, Sebastian Nowak, D. Wegener, E. Križnič, D. B. Macfarlane, P. Križan, A. Golutvin, K. W. Edwards, and J. Stiewe
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Argus, Muon, Electron–positron annihilation, Elementary particle, Electron, Spectral line, Nuclear physics, Momentum, Michel parameters, computer, computer.programming_language
Abstract: Using the ARGUS detector at the e+e− storage ring DORIS II, we have determined the Michel parameters ϱ and ξ of τ → μν ν and τ → eν ν decays. From a data sample with 333 events/pb around s = 10 GeV , we select 3230 events e + e − → τ + τ − → (μ ± μ μ )( e ǂv v ) and determine ϱ from the e and μ momentum spectra and ξ from the correlations between e and μ momenta. For ϱ we obtain ϱτ→e = 0.79 ± 0.08 ± 0.06 and ϱτ→μ = 0.76 ± 0.08 in accordance with the V - A structure of the decays. The momentum correlations are only sensitive to the product ξτ→eξτ→μ. Setting ξτ→e = ξτ→μ, we obtain |ξτ| = 0.90 ± 0.15 ± 0.10 also in accordance with V - A. The updated decay fractions are B(τ → e v v ) = (17.5 ± 0.3 ± 0.5)% and B(τ → μv v ) = (17.4 ± 0.3 ± 0.5)% .
Published: 1993
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21. Inclusive production of η′ (958) andf o (975) mesons in the υ energy region

Author: V. Lubimov, Mikhail Danilov, W. Schmidt-Parzefall, Ivan Belyaev, H. Wegener, T. Podobnik, H. Albrecht, A. Kosche, J. Stiewe, R. P. Hofmann, R. Wurth, T. Oest, D. Reßing, J. Spengler, J. D. Prentice, D. Töpfer, C. Hast, C. E. K. Charlesworth, M. Seeger, T. S. Yoon, A. Lange, Werner Hofmann, D. B. MacFarlane, A. Lindner, I. Tichomirov, G. Kernel, A. Droutskoy, K. Strahl, Vladislav Balagura, T. Siegmund, H. Kapitza, R. D. Appuhn, M. Walter, G. Kostina, R. Waldi, M. Schieber, Michael Schneider, P. Eckstein, R. G. Van de Water, A. Zimmermann, Yu. Zaitsev, S. Werner, M. Bittner, S. Khan, A. Hüpper, R. Reiner, Yu. Gershtein, Manfred Paulini, P. M. Patel, I. V. Gorelov, P. Pakhlov, A. Walther, T. Kirchhoff, Fedor Ratnikov, E.R.F. Hyatt, Dave Britton, H. Schröder, K. W. Edwards, E. Križnič, Thomas Hamacher, V. Soloshenko, V. Shibaev, B. Spaan, W. Funk, A. Nau, K. T. Knöpfle, Sergey Semenov, Peter Krieger, P. R. B. Saull, K. R. Schubert, S. Chechelnitsky, Hermann Kolanoski, K. Ehret, S. Nowack, P. Križan, A. Golutvin, Holger Schulz, D. Wegener, T. Živko, R. Mundt, M. Schmidtler, H. Thurn, K. Reim, Rainer Mankel, S. Weseler, H. Ehrlichmann, and K. Tzamariudaki
Subjects: Physics, Particle physics, Argus, Annihilation, Physics and Astronomy (miscellaneous), Meson, Octet, Electron–positron annihilation, Nuclear physics, Pseudoscalar, Vector meson, Singlet state, Engineering (miscellaneous), computer, computer.programming_language
Abstract: The inclusive production cross sections of η′ (958) andf o (975) mesons are measured ine + e − annihilation in the nonresonant continuum around $$\sqrt s = 10$$ GeV and in decays of the υ resonances using the ARGUS detector. For η′ (958) mesons, a production ratio of η′ (958)/ηdir=0.35±0.24, with ηdir=η−BR(η′→ηX)·η′, is determined in direct υ(1S) decays, which can be partially explained by the pseudoscalar singlet/octet mixing. Forf o (975) production, we obtain a production ratio off o (975)/p(770)°=0.17±0.030 in direct υ(1S) decays. In its production features, thef o (975) behaves like an ordinary meson, though aK $$\bar K$$ molecule nature cannot be excluded. The substantial production yield of thef o (975) meson demonstrates the important effect of feeddown from mesons beyond the basic multiples on pseudoscalar and vector meson production.
Published: 1993
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22. Inclusive production of charged pions, kaons and protons in υ(4S) decays

Author: P. Pakhlov, Leif J. Jönsson, T. Oest, I. V. Gorelov, Holger Schulz, Sebastian Nowak, P. R. B. Saull, E. Križnič, E.R.F. Hyatt, D. Wegener, M. Schmidtler, Mikhail Danilov, K. W. Edwards, H. Schröder, H. Wegener, T. Živko, Werner Hofmann, A. Hüpper, T. Podobnik, V. Shibaev, Manfred Paulini, H. Kapitza, R. G. Van de Water, C. Hast, R. Mundt, Fedor Ratnikov, K. Strahl, Vladislav Balagura, K. T. Knöpfle, Ivan Belyaev, A. Lindner, M. Reidenbach, J. Stiewe, A. Lange, D. Reßing, V. Lubimov, S. Khan, D. Töpfer, K. Tzamariudaki, H. Thurn, Michael Schneider, P. Murat, S. Weseler, M. Walter, H. Ehrlichmann, P. Križan, A. Golutvin, W. Schmidt-Parzefall, H. I. Cronström, D. B. MacFarlane, R. P. Hofmann, A. Hölscher, R. Waldi, T. Siegmund, T. S. Yoon, A. Droutskoy, A. Nau, Sergey Semenov, K. Reim, Peter Krieger, C. E. K. Charlesworth, Hermann Kolanoski, Sally Seidel, S. Werner, Rainer Mankel, J. D. Prentice, Dave Britton, Yu. Zaitsev, B. Spaan, W. Funk, I. Tichomirov, R. D. Appuhn, Thomas Hamacher, V. Soloshenko, A. Walther, John D. Spengler, H. Albrecht, R. Wurth, T. Kirchhoff, K. R. Schubert, K. Ehret, G. Kostina, R. Reiner, M. Schieber, P. M. Patel, and G. Kernel
Subjects: Physics, Argus, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Nuclear Theory, Hadron, Particle identification, Momentum, Nuclear physics, Pion, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), computer, Storage ring, computer.programming_language
Abstract: Using the detector ARGUS at thee + e − storage ring DORIS II, we have investigated inclusive momentum spectra of charged pions, kaons, and protons from decays of the υ(4S) meson. The kaon spectra have been measured in two independent ways, by coherently exploiting the detector's particle identification capabilities, and by detecting decays in-flight. The extracted mean multiplicities for charged hadrons are 7.17±0.05±0.14 pions, 1.56±0.03±0.05 kaons and 0.110±0.010±0.007 protons per υ(4S) decay, where pions and protons fromK and Δ decays have been subtracted.
Published: 1993
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23. Observation of semileptonic decay

Author: P. Murat, Sally Seidel, R. Waldi, S. Weseler, John D. Spengler, A. Lindner, M. Walter, Holger Schulz, H. Albrecht, J. Stiewe, R. Wurth, H. Ehrlichmann, H. I. Cronström, T. Živko, M. Schieber, B. Spaan, W. Funk, A. Nau, Sergey Semenov, T. Kirchhoff, Hermann Kolanoski, R. Mundt, K. T. Knöpfle, Thomas Hamacher, V. Soloshenko, S. Werner, K. Reim, Mikhail Danilov, P. Krieger, H. Thurn, P. Križan, A. Golutvin, P. R. B. Saull, J. D. Prentice, V. Shibaev, A. Hölscher, R. D. Appuhn, Rainer Mankel, R. P. Hofmann, W. Schmidt-Parzefall, M. Schmidtler, C. Hast, E. Križnič, Manfred Paulini, C. E. K. Charlesworth, H. Schröder, D. Reβing, P. Pakhlov, K. W. Edwards, A. Lange, K. R. Schubert, Werner Hofmann, A. Hüpper, D. B. Macfarlane, Dave Britton, T. Siegmund, I. V. Gorelov, Fedor Ratnikov, M. Reidenbach, A. Walther, K. Ehret, P. M. Patel, G. Kernel, I. Tichomirov, G. Kostina, Yu. Zaitsev, R. Reiner, Michael Schneider, K. Strahl, Vladislav Balagura, V. Lubimov, Ivan Belyaev, D. Töpfer, H. Kapitza, Leif J. Jönsson, A. Droutskoy, T. Oest, E.R.F. Hyatt, H. Wegener, T. Podobnik, Sebastian Nowak, D. Wegener, R. G. Van de Water, S. Khan, K. Tzamariudaki, and T. S. Yoon
Subjects: Semileptonic decay, Physics, Nuclear and High Energy Physics, Argus, Physics::Instrumentation and Detectors, Branching fraction, High Energy Physics::Phenomenology, DESY, Nuclear physics, Baryon, High Energy Physics::Experiment, computer, Storage ring, computer.programming_language
Abstract: Observation of the semileptonic decay of the charmed baryon in the decay channel has been made using the ARGUS detector at the e + e − storage ring DORIS II at DESY. The cross section times branching ratio was found to be .
Published: 1993
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24. Search for rareB meson decays intoD s + mesons

Author: Manfred Paulini, Dave Britton, S. Weseler, B. Spaan, W. Funk, R. D. Appuhn, P. Eckstein, H. Ehrlichmann, M. Walter, K. T. Knöpfle, T. S. Yoon, Holger Schulz, A. Walther, G. Kernel, Peter Krieger, G. Kostina, T. Živko, Sebastian Nowak, K. Reim, D. Wegener, R. Waldi, R. G. Van de Water, Yu. Gershtein, Yu. Zaitsev, I. V. Gorelov, T. Siegmund, S. Werner, Rainer Mankel, R. Mundt, H. Schröder, M. Schmidtler, J. D. Prentice, S. Khan, H. Thurn, Mikhail Danilov, K. Strahl, R. Reiner, Vladislav Balagura, I. Tichomirov, T. Oest, M. Bittner, R. P. Hofmann, P. Pakhlov, K. Tzamariudaki, E. Križnič, H. Wegener, M. Schieber, T. Podobnik, D. B. MacFarlane, P. R. B. Saull, Werner Hofmann, K. R. Schubert, A. Droutskoy, S. Chechelnitsky, J. Stiewe, A. Hüpper, V. Shibaev, P. M. Patel, D. Reßing, Fedor Ratnikov, A. Nau, Sergey Semenov, Hermann Kolanoski, K. Ehret, T. Kirchhoff, P. Križan, A. Golutvin, A. Lindner, John D. Spengler, H. Albrecht, R. Wurth, Thomas Hamacher, V. Soloshenko, E.R.F. Hyatt, K. W. Edwards, C. Hast, A. Lange, Ivan Belyaev, Michael Schneider, D. Töpfer, H. Kapitza, W. Schmidt-Parzefall, C. E. K. Charlesworth, and V. Lubimov
Subjects: Quark, Physics, Argus, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Resonance, Coupling (probability), Nuclear physics, High Energy Physics::Experiment, B meson, Engineering (miscellaneous), computer, computer.programming_language
Abstract: A search has been performed for rareB meson decays intoD − mesons arising fromb→u transitions,W exchange modes,B + annihilation processes, and decays where theD + is not produced via aW→c $$\bar s$$ quark pair coupling, using the ARGUS detector operating on the Ψ(4S) resonance at thee + e − storage ring DORIS II. Upper limits for individual decay modes are obtained. In addition, from a study ofD + l- correlations an upper limit of BR (B→D + l- X) (90% CL) is determined.
Published: 1993
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25. Analysis of the decayτ - →π - π - π + v τ and determination of thea 1(1260) resonance parameters

Author: S. Werner, K. T. Knöpfle, D. B. MacFarlane, A. Droutskoy, M. Bittner, R. Mundt, A. Walther, Sebastian Nowak, Ivan Belyaev, T. S. Yoon, D. Wegener, J. Stiewe, H. Thurn, John D. Spengler, C. Hast, A. Lindner, A. Lange, D. Reßing, T. Siegmund, Yu. Zaitsev, K. R. Schubert, H. Schröder, S. Chechelnitsky, H. Albrecht, D. Töpfer, Holger Schulz, J. D. Prentice, G. Kernel, B. Spaan, W. Funk, R. Wurth, K. Ehret, H. Wegener, A. Nau, V. Shibaev, T. Živko, R. G. Van de Water, Sergey Semenov, Hermann Kolanoski, S. Khan, G. Kostina, T. Podobnik, W. Schmidt-Parzefall, R. P. Hofmann, K. Strahl, Vladislav Balagura, P. Pakhlov, Peter Krieger, K. Reim, H. Kapitza, C. E. K. Charlesworth, Manfred Paulini, E. Križnič, R. Waldi, Michael Schneider, V. Lubimov, T. Kirchhoff, Dave Britton, I. V. Gorelov, Rainer Mankel, E.R.F. Hyatt, M. Schmidtler, K. W. Edwards, R. D. Appuhn, P. R. B. Saull, P. Eckstein, M. Walter, T. Oest, Thomas Hamacher, V. Soloshenko, S. Weseler, H. Ehrlichmann, R. Reimer, K. Tzamariudaki, P. Križan, A. Golutvin, M. Schieber, P. M. Patel, Mikhail Danilov, Yuri Gershtein, Werner Hofmann, A. Hüpper, Fedor Ratnikov, and I. Tichomirov
Subjects: Physics, Argus, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, Hadron, Dalitz plot, Resonance, Elementary particle, Intermediate state, Atomic physics, Engineering (miscellaneous), computer, computer.programming_language
Abstract: Using the ARGUS detector at the DORIS IIe +e− storage ring we have studied the three-pion hadronic final state in the decay τ- → π-π-π+ v τ. From about 7500 events we conclude that the three-pion system is dominated by theJ P=1+ resonancea 1 (1260) decaying preferentially via ρ0π-. Our data restrict a possible ρπ contribution of three-pion states without intermediate resonances to less than 6% at 95% CL. Fitting a model by Isgur et al. to the data yields $$m_{a_1 } = (1.211 \pm 0.007 \pm _{0.0}^{0.050} ) GeV/c^2 $$ and $$\Gamma _{a_1 } = (0.446 \pm 0.0021 \pm _{0.0}^{0.140} ) GeV/c^2 $$ . The second errors reflect the model dependence of the result. This is the currently most significant determination of thea 1 resonance parameters. The ratio ofS- andD-wave amplitudes for the ρ0π- intermediate state of thea 1 − decay at the nominala 1 − mass was found to beD/S=−0.11±0.02. Using thisD/S ratio we update our former measurement of the parity violating asymmetry parameter $$\gamma _{AV} = 2g_A g_V /(g_A^2 + g_V^2 )$$ to 1.25±0.23± 0.08 0.15 . The branching ratio of the decay τ- → π-π-π+ v τ is determined to be Br(τ- → π-π-π+ v τ)=(6.8±0.1±0.5)%.
Published: 1993
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26. A measurement of the tau mass

Author: G. Kernel, M. Schieber, V. Shibaev, S. Semenov, Leif J. Jönsson, V. Lubimov, H. Schröder, D. Wegener, D. Reβing, R. Wurth, C. Hast, J. Stiewe, T. Oest, P. Križan, G. Kostina, K. Reim, A. Lange, T. Kirchhoff, S. Werner, Michael Schneider, A. Droutskoy, H. Albrecht, H. Wegener, E. Križnič, W. Funk, R. P. Hofmann, M. Schmidtler, T. Podobnik, H.D. Schulz, R. Reiner, J. D. Prentice, Sebastian Nowak, A. Walther, M. Danilov, K. Strahl, Vladislav Balagura, Ivan Belyaev, W. Schmidt-Parzefall, R. Mankel, K. T. Knöpfle, K. R. Schubert, C. E. K. Charlesworth, S. Weseler, I. Tichomirov, P. Murat, D. Töpfer, R. Mundt, R. Waldi, K. W. Edwards, R. D. Appuhn, H. Ehrlichmann, H. Thurn, K. Ehret, P. Krieger, R. G. Van de Water, E.R.F. Hyatt, A. Nau, P. M. Patel, A. Golutvin, H. Kapitza, Hermann Kolanoski, S. Khan, Dave Britton, P. Pakhlov, Yu. Zaitsev, J. Spengler, T. S. Yoon, M. Walter, H. I. Cronström, I. Gorelov, T. Živko, Werner Hofmann, A. Hüpper, K. Tzamariudaki, P. R. B. Saull, F. Ratnikov, A. Lindner, T. Siegmund, Manfred Paulini, B. Spaan, Thomas Hamacher, and V. Soloshenko
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Particle physics, Electron–positron annihilation, Mass spectrum, computer, Storage ring, Lepton, computer.programming_language
Abstract: Using the ARGUS detector at the DORIS II storage ring, a new measurement of the mass of the τ lepton has been obtained. An analysis of the tau pseudomass spectrum for decays of the type τ− → π−π−π+ντ finds mτ = 1776.3±2.4±1.4 MeV/c2. This result also leads to an improvement of the upper limit on the ντ mass to mντ < 31 MeV/c2 at the 95% confidence level.
Published: 1992
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27. A new determination of theB 0 $$\bar B^0 $$ oscillation strength

Author: Manfred Paulini, Holger Schulz, C. Geyer, C. Hast, Mikhail Danilov, T. Živko, R. Waldi, A. Lange, A. Krüger, R. G. Van de Water, B. Fominykh, John D. Spengler, A. Walther, R. Mundt, D. Wegener, H. Albrecht, T. Siegmund, A. Semenov, S. Khan, S. Ball, J. C. Gabriel, Werner Hofmann, H. Thurn, R. Wurth, Sally Seidel, J. Stiewe, D. Reßing, Leif J. Jönsson, Thomas Hamacher, V. Soloshenko, P. Pakhlov, T. Oest, V. Shevchenko, I. Tichomirov, S. Weseler, Peter Krieger, H. Schröder, W. Schmidt-Parzefall, Robert K. Kutschke, G. Herrera, K. Strahl, Vladislav Balagura, C. E. K. Charlesworth, B. Holzer, P. Križan, V. Lubimov, H. Ehrlichmann, E. Križniĉ, A. Golutvin, Fedor Ratnikov, A. Nau, Sergey Semenov, A. Hölscher, M. Reidenbach, C. W. Darden, Hermann Kolanoski, D. B. MacFarlane, Yu. Zaitsev, R. Childers, A. Droutskoy, H. Wegener, K. T. Knöpfle, K. Tzamariudaki, H. I. Cronström, T. Podobnik, J. D. Prentice, A. Nippe, T. S. Yoon, K. Reim, S. Werner, B. Boŝtjanĉiĉ, Rainer Mankel, A. Rostovtsev, I. V. Gorelov, B. Spaan, W. Funk, R. D. Appuhn, M. Schäfer, Georgios Tsipolitis, Dave Britton, F. Sefkow, R. S. Orr, U. Volland, G. Kernel, K. R. Schubert, M. Schieber, A. Lindner, P. M. Patel, D. Töpfer, Stefan Schael, H. Kapitza, and K. W. Edwards
Subjects: Physics, Argus, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Elementary particle, DESY, Nuclear physics, Engineering (miscellaneous), computer, Storage ring, Lepton, Bar (unit), computer.programming_language
Abstract: Using the ARGUS detector at thee+e− storage ring DORIS II at DESY, a study ofB0$\bar B^0 $ oscillations has been performed using three different techniques. Besides the standard dilepton method, charge correlations betweenD* mesons and one or two leptons have also been investigated. The mixing parameterr is determined to be (20.6±7.0)%.
Published: 1992
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28. Measurement of exclusive one-prong and inclusive three-prong branching ratios of the τ lepton

Author: B. Holzer, K. T. Knöpfle, P. Pakhlov, H. Schröder, K. Reim, Mikhail Danilov, Stefan Schael, Leif J. Jönsson, A. Semenov, H. Kapitza, Peter Krieger, Rainer Mankel, J. C. Gabriel, B. Fominykh, D. Wegener, K. Strahl, Vladislav Balagura, S. Weseler, Robert K. Kutschke, R. S. Orr, T. Oest, P. Križan, R. Mundt, H. Ehrlichmann, G. Herrera, V. Lubimov, U. Volland, Werner Hofmann, A. Golutvin, D. Töpfer, A. Hölscher, H. Thurn, K. Tzamariudaki, H. I. Cronström, C. W. Darden, A. Nau, Sergey Semenov, A. Lindner, E. Križnič, Georgios Tsipolitis, C. Geyer, C. Hast, Hermann Kolanoski, R. Waldi, Dave Britton, Holger Schulz, A. Nippe, H. Wegener, A. Lange, Manfred Paulini, I. V. Gorelov, K. W. Edwards, F. Sefkow, T. Podobnik, J. Stiewe, J. D. Prentice, Fedor Ratnikov, D. Reßing, T. Živko, W. Schmidt-Parzefall, M. Reidenbach, S. C. Seider, R. D. Appuhn, T. S. Yoon, M. Schäfer, K. B. Schubert, T. Siegmund, S. Ball, B. Spaan, W. Funk, A. Krüger, R. G. Van de Water, C. E. K. Charlesworth, S. Khan, M. Schieber, S. Werner, P. M. Patel, A. Rostovtsev, G. Kernel, Yu. Zaitsev, B. Boštjančič, Thomas Hamacher, V. Soloshenko, A. Walther, John D. Spengler, H. Albrecht, R. Wurth, V. Shevchenko, I. Tichomirov, D. B. MacFarlane, R. Childers, and A. Droutskoy
Subjects: Physics, Argus, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Branching (polymer chemistry), Engineering (miscellaneous), computer, Charged particle, computer.programming_language, Lepton
Abstract: Using the ARGUS detector at the DORIS II storage ring, we have studied τ decays with one or three charged particles in the final state, obtaining the following values for the branching ratios: BR(τ−→e − $$\bar v_e v_\tau $$ )=(17.3±0.4±0.5)% BR(τ−→μ− $$\bar v_\mu v_\tau $$ )=(17.2±0.4±0.5)%,BR(τ−→π− v π)+BR(τ−→K − v π)=(11.7±0.6±0.8)% and BR(π−→3-prong)=(13.3±0.3±0.8)%. These measurements confirm the present world averages with a precision, in each case, comparable to the error on the combination of all previous results.
Published: 1992
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29. Measurement of the decayτ − →ρ − ν τ

Author: G. Kernel, J. D. Prentice, J. Stiewe, W. Schmidt-Parzefall, M. Schieber, K. T. Knöpfle, P. M. Patel, S. Werner, Mikhail Danilov, K. Ehret, C. Hast, Michael Schneider, Thomas Hamacher, V. Soloshenko, T. Zivko, H. Schröder, K. Strahl, Vladislav Balagura, H. Wegener, P. Murat, Manfred Paulini, R. D. Appuhn, T. Podobnik, Peter Krieger, C. E. K. Charlesworth, Werner Hofmann, D. Ressing, A. Hüpper, T. Kirchhoff, A. Lange, T. S. Yoon, G. Kostina, I. V. Gorelov, Leif J. Jönsson, H. Kapitza, Fedor Ratnikov, Holger Schulz, T. Oest, T. Siegmund, Dave Britton, Richard George van de Water, R. Reiner, P. Krizan, V. Shibaev, Yu. Zaitsev, D. B. MacFarlane, Ivan Belyaev, Sameen Ahmed Khan, A. Droutskoy, H. Albrecht, I. Tikhomirov, R. Mankel, R. Wurth, V. Lyubimov, P. R. B. Saull, B. Spaan, W. Funk, M. Walter, A. Walther, D. Töpfer, H. I. Cronström, A. Golutvin, A. Lindner, E. Kriznic, R. Waldi, R. P. Hofmann, Klaus R. Schubert, E.R.F. Hyatt, K. W. Edwards, Sebastian Nowak, D. Wegener, A. Nau, Sergey Semenov, Hermann Kolanoski, P. Pakhlov, S. Weseler, H. Ehrlichmann, M. Schmidtler, R. Mundt, H. Thurn, K. Reim, K. Tzamariudaki, and J. Spengler
Subjects: Physics, Particle physics, Argus, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, Coupling (probability), Pion, Tau neutrino, Invariant mass, Engineering (miscellaneous), computer, computer.programming_language, Spin-½
Abstract: An analysis of the decay τ-→π-π0vτ has been performed using the ARGUS detector at the DORIS II storage ring. The branching ratio has been determined to be Br(τ-→π-π0vτ=(22.6±0.4±0.9)%. The shape of the π-π0 invariant mass spectrum is found to be in good agreement with the predictions obtained using the conserved vector current (CVC) hypothesis, suggesting that the π-π0 system is produced in aJP=1− state. An analysis of the measured decay angular distribution of the pions with respect to the flight direction of the π-π0 system demonstrates the vector nature of the coupling at the τvτ vertex. With the assumption of zerovτ mass thevτ spin has been shown to be$J_{v_\tau}= \tfrac{1}{2} $.
Published: 1992
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30. Evidence for the production of the charmed, doubly strange baryon Ωc in e+e− annihilation

Author: Sebastian Nowak, T. Kirchhoff, C. Hast, S. Kahn, D. Wegener, R. P. Hofmann, A. Lange, M. Walter, R. G. Van de Water, T. Siegmund, V. Lubimov, H. I. Cronström, T. S. Yoon, I. Tichomirov, H. Schröder, I. V. Gorelov, V. Shibaev, W. Schmidt-Parzefall, E. Križnič, J. Stiewe, S. Weseler, John D. Spengler, P. M. Patel, D. Reßing, P. R. B. Saull, H. Wegener, C. E. K. Charlesworth, H. Albrecht, K. W. Edwards, D. B. Macfarlane, K. Strahl, Vladislav Balagura, Manfred Paulini, T. Podobnik, R. Wurth, K. Tzamariudaki, H. Ehrlichmann, Thomas Hamacher, K. T. Knöpfle, V. Soloshenko, A. Lindner, J. D. Prentice, Yu. Zaitsev, P. Križan, A. Golutvin, U. Becker, G. Kernel, A. Hölscher, Leif J. Jönsson, A. Droutskoy, A. Walther, M. Schmidtler, M. Schieber, T. Oest, S. Werner, E.R.F. Hyatt, K. Reim, Ivan Belyaev, Rainer Mankel, Mikhail Danilov, D. Töpfer, P. Murat, A. Nau, R. Waldi, H. Kapitza, Sergey Semenov, Hermann Kolanoski, P. Krieger, Werner Hofmann, A. Hüpper, Fedor Ratnikov, M. Reidenbach, Michael Schneider, P. Pakhlov, Sally Seidel, Holger Schulz, T. Živko, R. Mundt, H. Thurn, R. D. Appuhn, G. Kostina, B. Spaan, W. Funk, Dave Britton, R. Reiner, K. R. Schubert, and K. Ehret
Subjects: Physics, Nuclear and High Energy Physics, Argus, Particle physics, Annihilation, Branching fraction, Electron–positron annihilation, DESY, lcsh:QC1-999, Baryon, Nuclear physics, Production (computer science), computer, lcsh:Physics, Storage ring, computer.programming_language
Abstract: Using the detector ARGUS at the storage ring DORIS II of DESY, we have found evidence for the production of the charmed and doubly strange baryon Ω c through its decay channel Ξ − K − π + π + . Its mass has been determined to be ((2719.0±7.0±2.5)MeV/ c 2 , and the product of production cross section and branching ratio the above channel to be (2.41±0.90±0.30) pb.
Published: 1992
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31. New results onD 0 decays

Author: A. Lindner, S. Werner, P. Pakhlov, E.R.F. Hyatt, K. W. Edwards, G. Kernel, Holger Schulz, Leif J. Jönsson, A. Nau, P. Križan, A. Golutvin, K. Strahl, Vladislav Balagura, M. Schmidtler, Sergey Semenov, T. Živko, Hermann Kolanoski, A. Hölscher, H. Kapitza, H. Schröder, Peter Krieger, T. Oest, C. Hast, R. Mundt, D. B. MacFarlane, A. Hüpper, V. Lubimov, Michael Schneider, Ivan Belyaev, G. Kostina, P. R. B. Saull, A. Lange, A. Droutskoy, H. Thurn, K. T. Knöpfle, R. P. Hofmann, W. Schmidt-Parzefall, H. Wegener, Sally Seidel, Yu. Zaitsev, S. Weseler, M. Schieber, Fedor Ratnikov, Manfred Paulini, R. G. Van de Water, T. Podobnik, D. Töpfer, R. Reiner, H. Ehrlichmann, M. Reidenbach, C. E. K. Charlesworth, E. Križnič, Dave Britton, P. M. Patel, K. R. Schubert, A. Semenov, Mikhail Danilov, K. Reim, M. Walter, S. Khan, K. Ehret, H. I. Cronström, T. Siegmund, Rainer Mankel, B. Spaan, W. Funk, I. V. Gorelov, Werner Hofmann, T. S. Yoon, J. Stiewe, R. D. Appuhn, D. Reßing, V. Shibaev, K. Tzamariudaki, John D. Spengler, A. Walther, H. Albrecht, R. Wurth, I. Tichomirov, T. Kirchhoff, Thomas Hamacher, V. Soloshenko, Sebastian Nowak, D. Wegener, P. Murat, R. Waldi, and J. D. Prentice
Subjects: Physics, Particle physics, Argus, Physics and Astronomy (miscellaneous), Meson, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Elementary particle, Engineering (miscellaneous), Omega, computer, computer.programming_language
Abstract: Using the ARGUS detector at thee+e− storage ring DORIS II, we have studied nine decay modes of theD0 meson. In addition to a higher-precision determination of the branching ratios for these modes, several new channels, the decays$D^0 \to \bar K^0 \eta '$,$D^0 \to \bar K^{*0} \omega $ and$D^0 \to \bar K\pi ^ + \omega $, have been observed for the first time.
Published: 1992
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32. Search for charm production in direct decays of the ϒ(1S) resonance

Author: Ivan Belyaev, K. T. Knöpfle, B. Spaan, W. Funk, V. Shibaev, D. Töpfer, M. Schieber, G. Kernel, A. Lindner, P. M. Patel, P. R. B. Saull, R. Mundt, P. Murat, Manfred Paulini, W. Schmidt-Parzefall, Peter Krieger, Thomas Hamacher, Dave Britton, V. Soloshenko, H. Wegener, C. E. K. Charlesworth, H. Thurn, R. Waldi, C. Hast, H. Kapitza, S. Weseler, A. Lange, P. Pakhlov, M. Walter, G. Herrera, T. Podobnik, H. Ehrlichmann, T. Siegmund, K. Tzamariudaki, R. D. Appuhn, Michael Schneider, A. Nau, M. Schmidtler, Sergey Semenov, A. Walther, H. Schröder, E.R.F. Hyatt, A. Krüger, R. G. Van de Water, Hermann Kolanoski, Holger Schulz, D. B. MacFarlane, K. W. Edwards, M. Schäfer, A. Droutskoy, Leif J. Jönsson, T. Živko, Sebastian Nowak, D. Wegener, S. Khan, K. Reim, T. Oest, Rainer Mankel, H. I. Cronström, T. S. Yoon, J. D. Prentice, I. Tichomirov, P. Križan, A. Golutvin, A. Hölscher, E. Križnič, John D. Spengler, S. Werner, H. Albrecht, R. Wurth, A. Nippe, I. V. Gorelov, Sally Seidel, J. Stiewe, D. Reßing, Yu. Zaitsev, Mikhail Danilov, Werner Hofmann, A. Hüpper, K. Strahl, Fedor Ratnikov, Vladislav Balagura, M. Reidenbach, V. Lubimov, K. R. Schubert, K. Ehret, and G. Kostina
Subjects: Physics, Argus, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Resonance, DESY, Nuclear physics, Charm (quantum number), Engineering (miscellaneous), computer, Storage ring, computer.programming_language, Lepton
Abstract: The production ofD*(2010)+ andJ/ψ mesons and prompt leptons has been investigated ine+e− interactions at the Ψ(1S) resonance energy. The data were collected at the storage ring DORIS II at DESY with the ARGUS detector. We obtain upper limits of BRdir (ϒ (1S)→D*(2010)±+X) 0.2) and BRdir (ϒ(1S)→J/ψ+X)
Published: 1992
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33. A measurement of the inclusive semileptonic decay fraction of charmed hadrons

Author: V. Lubimov, A. Walther, R. D. Appuhn, M. Danilov, H. Wegener, R. Waldi, M. Schäfer, H.D. Schulz, C. W. Darden, A. Semenov, T. Podobnik, J. C. Gabriel, P. Krieger, K. R. Schubert, S. Werner, J. D. Prentice, P. M. Patel, T. Siegmund, S. Ball, Leif J. Jönsson, J. Spengler, V. Shevchenko, I. Tichomirov, T. S. Yoon, D. Wegener, C. Geyer, C. Hast, T. Oest, R. Mankel, K. Strahl, Vladislav Balagura, K. W. Edwards, M. Schieber, A. Lange, C. E. K. Charlesworth, U. Volland, B. Holzer, D. Töpfer, R. Childers, G. Herrera, A. Golutvin, R. S. Orr, A. Droutskoy, Manfred Paulini, Yu. Zaitsev, A. Krüger, R. G. Van de Water, Dave Britton, B. Spaan, K. Tzamariudaki, R. Wurth, F. Sefkow, S. Khan, B. Boštjančič, F. Ratnikov, H. Ehrlichmann, A. Lindner, Thomas Hamacher, V. Soloshenko, A. Rostovtsev, Stefan Schael, I. Gorelov, H. I. Cronström, H. Kapitza, E. Križnič, W. Funk, A. Nippe, D. B. Macfarlane, G. Kernel, Robert K. Kutschke, P. Križan, A. Hölscher, J. Stiewe, D. Reßing, S. Semenov, H. Schröder, H. Albrecht, M. Reidenbach, B. Fominykh, Werner Hofmann, Michael Schneider, R. Mundt, H. Thurn, Sally Seidel, T. Živko, S. Weseler, K. Reim, M. Schmidtler, W. Schmidt-Parzefall, A. Nau, G. Tsipolitis, Hermann Kolanoski, and K. T. Knöpfle
Subjects: Semileptonic decay, Physics, Nuclear and High Energy Physics, Argus, Particle physics, Branching fraction, Hadron, Detector, DESY, Fraction (chemistry), Nuclear physics, computer, Storage ring, computer.programming_language
Abstract: Using the ARGUS detector at the DORIS-II storage ring at DESY, we have measured the inclusive semileptonic branching ratio of charmed hadrons produced in e+e− annihilition at =10 GeV to be BR(c→eveX)=(9.8±0.9±0.5 0.6)% and BR(c→μvμX)=(8.6±1.7±0.70.8)%.
Published: 1992
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34. Measurement of inclusive baryon production inB meson decays

Author: S. Semenov, Ivan Belyaev, K. Strahl, Vladislav Balagura, H. Schröder, D. B. MacFarlane, H.D. Schulz, V. Shibaev, V. Lubimov, D. Töpfer, T. Zivko, Michael Schneider, A. Droutskoy, P. Murat, K. Reim, Sally Seidel, Thomas Hamacher, V. Soloshenko, H. Ehrlichmann, A. Nau, R. Waldi, J. Stiewe, T. S. Yoon, D. Reßing, P. R. B. Saull, Sebastian Nowak, Hermann Kolanoski, E. Križnič, R. Mankel, K. W. Edwards, S. Werner, M. Śchmidtler, M. Danilov, D. Wegener, Manfred Paulini, M. Walter, W. Funk, C. E. K. Charlesworth, E.R.F. Hyatt, B. Spaan, C. Hast, J. D. Prentice, H. I. Cronström, F. Ratnikov, R. G. Van de Water, A. Lindner, K. T. Knöpfle, A. Lange, A. Hüpper, R. Wurth, S. Khan, P. M. Patel, T. Siegmund, M. Schieber, H. Albrecht, P. Križan, H. Kapitza, I. Tichomirov, A. Hölscher, R. P. Hofmann, Yu. Zaitsev, M. Reidenbach, P. Krieger, G. Kernel, T. Kirchhoff, K. Tsamariudaki, I. Gorelov, Werner Hofmann, K. R. Schubert, R. Mundt, K. Ehret, G. Kostina, H. Thurn, R. Reiner, P. Pakhlov, J. Spengler, Leif J. Jönsson, T. Oest, R. D. Appuhn, H. Wegener, T. Podobnik, A. Golutvin, Dave Britton, W. Schmidt-Parzefall, S. Weseler, and A. Walther
Subjects: Physics, Particle physics, Argus, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Nuclear Theory, High Energy Physics::Phenomenology, DESY, Astrophysics::Cosmology and Extragalactic Astrophysics, Nuclear physics, Baryon, High Energy Physics::Experiment, B meson, Nuclear Experiment, Engineering (miscellaneous), computer, Storage ring, Bar (unit), computer.programming_language
Abstract: Using the ARGUS detector at thee + e − storage ring DORIS II at DESY, we have studiedB meson decays into baryonsp and Λ. From the simultaneous analysis ofp and Λ yields,p $$\bar p$$ and Λ $$\bar p$$ correlations, and various lepton-baryon and lepton-baryon-antibaryon correlations the inclusive branching ratio is found to be BR (B→baryons)=(6.8±0.5±0.3)%.
Published: 1992
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35. Production ofD S + mesons inB decays and determination of $$f_{D_S } $$

Author: K. T. Knöpfle, A. Nau, Sergey Semenov, V. Shevchenko, J. Stiewe, Hermann Kolanoski, S. Weseler, I. Tichomirov, R. Mundt, Thomas Hamacher, D. Reßing, V. Soloshenko, H. Thurn, H. Ehrlichmann, G. Kernel, D. B. MacFarlane, H. Wegener, A. Walther, Robert K. Kutschke, B. Holzer, A. Semenov, P. Križan, Holger Schulz, R. Childers, A. Droutskoy, J. C. Gabriel, R. Waldi, A. Golutvin, A. Hölscher, T. Podobnik, W. Schmidt-Parzefall, G. Herrera, K. Reim, E. Križnič, G. Tspolitis, D. Wegener, T. Živko, A. Lindner, B. Boštjančič, K. Tzamariudaki, C. E. K. Charlesworth, John D. Spengler, Rainer Mankel, R. D. Appuhn, P. Pakhlov, M. Schieber, A. Nippe, C. Geyer, C. Hast, Fedor Ratnikov, A. Krüger, H. Albrecht, Peter Krieger, R. G. Van de Water, I. V. Gorelov, M. Reidenbach, A. Lange, D. Töpfer, R. Wurth, P. M. Patel, S. Khan, Leif J. Jönsson, Mikhail Danilov, M. Schäfer, Sally Seidel, T. S. Yoon, B. Fominykh, T. Oest, Werner Hofmann, K. W. Edwards, B. Spaan, W. Funk, Stefan Schael, H. Kapitza, H. I. Cronström, J. D. Prentice, Dave Britton, F. Sefkow, V. Lubimov, C. W. Darden, K. Strahl, Vladislav Balagura, H. Schröder, K. R. Schubert, R. S. Orr, U. Volland, Yu. Zaitsev, S. Werner, A. Rostovtsev, T. Siegmund, S. Ball, and Manfred Paulini
Subjects: Physics, Argus, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Elementary particle, Nuclear physics, Heavy quark effective theory, High Energy Physics::Experiment, Quantum field theory, Exponential decay, Engineering (miscellaneous), computer, computer.programming_language
Abstract: The production ofDS+ mesons inB meson decays, and inq$\bar q$ continuum events, has been studied with the ARGUS detector at thee+e− storage ring DORIS II. In addition to the measurement of inclusiveDS+ production in γ(4S)→B$\bar B$ decays, all eight two-body decay modesB→DS(*)D(*) have been measured with branching ratios between 1% and 3%. By comparing our inclusive and exclusive results to predictions of heavy quark effective theory, a value of (267±28) MeV × [2.7%/BR(Ds+→φπ+)]1/2 is obtained for the weak decay constant fDS(*), averaged overDS+ andDS*+ mesons.
Published: 1992
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36. First evidence of χc production in B meson decays

Author: K. T. Knöpfle, K. Strahl, P. Pakhlov, Vladislav Balagura, T. Siegmund, John D. Spengler, S. Ball, D.I. Britton, U. Volland, Leif J. Jönsson, H. Albrecht, D. Reβing, D. Wegener, S.C. Seidel, T. Oest, R. Wurth, J. Stiewe, V. Lubimov, B. Spaan, W. Funk, H. Wegener, R. Kutschke, A. Nau, Sergey Semenov, W. Schmidt-Parzefall, Manfred Paulini, D. B. Macfarlane, T. Podobnik, G. Tsipolitis, Hermann Kolanoski, G. Kernel, H.O. Cronström, V. Shevchenko, I. Tichomirov, A. Droutskoy, H. Schröder, Fedor Ratnikov, P. Krieger, G. Herrera, K. R. Schubert, C.E.K. Charlesworth, A. Lindner, R. D. Appuhn, M. Schieber, E. Križnič, M. Reidenbach, C. W. Darden, A. Walther, Stefan Schael, Holger Schulz, M. Schäfer, K. W. Edwards, Mikhail Danilov, S. Werner, A. Nippe, T. Živko, B. Fominykh, H. Kapitza, I. V. Gorelov, B. Boštjančič, P. Križan, A. Golutvin, D. Töpfer, P. M. Patel, R. Mundt, A. Hölscher, Werner Hofmann, J. D. Prentice, R. S. Orr, Thomas Hamacher, V. Soloshenko, F. Sefkow, A. Rostovtsev, H. Thurn, B. Holzer, Yu. Zaitsev, K. Reim, Rainer Mankel, S. Weseler, H. Ehrlichmann, R. Childers, C. Geyer, C. Hast, A. Lange, A. Semenov, J. C. Gabriel, R. Waldi, K. Tzamariudaki, T. S. Yoon, A. Krüger, R. G. Van de Water, and S. Khan
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Argus, Meson, Branching fraction, Electron–positron annihilation, DESY, B meson, computer, computer.programming_language
Abstract: Using the ARGUS detector at the e + e − storage ring DORIS II at DESY, we have obtained the first evidence for B meson decays into χ c mesons. The inclusive branching ratio for the decay B → χ c X was measured to the (1.05±0.35±0.25)% assuming no χ c2 production. In addition, four candidates for the exclusive decay B ± → χ c1 K ± have been observed, corresponding to a branching ratio of (0.19 ± 0.13 ± 0.06)%.
Published: 1992
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37. Measurement of the decay

Author: A. Lindner, Thomas Hamacher, V. Lubimov, V. Soloshenko, W. Schmidt-Parzefall, C. E. K. Charlesworth, Sebastian Nowak, P. Krieger, D. Wegener, John D. Spengler, H. Schröder, J. D. Prentice, H. Albrecht, A. Semenov, K. Strahl, Vladislav Balagura, R. Wurth, H. Wegener, M. Schmidtler, T. Siegmund, T. Podobnik, M. Schneider, M. Schieber, K. W. Edwards, Ivan Belyaev, I. Tichomirov, S. Werner, P. Murat, Mikhail Danilov, Leif J. Jönsson, R. Waldi, P. Križan, A. Golutvin, B. Fominykh, T. Oest, A. Hölscher, C. Hast, D. Töpfer, G. Kernel, A. Walther, A. Lange, H. I. Cronström, E. Križnič, A. Rostovtsev, Manfred Paulini, Werner Hofmann, P. Pakhlov, A. Hüpper, K. R. Schubert, P. M. Patel, M. Walter, A. Nippe, D. B. Macfarlane, A. Nau, Sergey Semenov, Fedor Ratnikov, S. Weseler, Hermann Kolanoski, Yu. Zaitsev, A. Droutskoy, M. Reidenbach, K. T. Knöpfle, K. Ehret, D. Reβing, R. Mundt, J. Stiewe, G. Kostina, H. Thurn, Sally Seidel, H. Ehrlichmann, Holger Schulz, I. V. Gorelov, T. Živko, Dave Britton, K. Reim, Rainer Mankel, R. D. Appuhn, M. Schäfer, B. Spaan, W. Funk, A. Krüger, R. G. Van de Water, S. Khan, T. S. Yoon, H. Kapitza, G. Herrera, and K. Tzamariudaki
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Meson, Branching fraction, Electron–positron annihilation, Analytical chemistry, B meson, DESY, computer, computer.programming_language
Abstract: Using the ARGUS detector at the e + e − storage ring DORIS II at DESY we have studied the decay B − → D ∗0 l − λ , where l − = e − or μ − , using the D 0 γ and D 0 π 0 decay modes of the D ∗0 meson. B mesons were produced in 209 000 decays of γ (4S). Assuming electron-muon universality, we obtain a value for the branching ratio of BR ( B − → D ∗0 l − λ )= (5.8 ± 1.4 ± 1.3)% .
Published: 1992
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38. A measurement of asymmetry in the decay Λc+ → Λπ+

Author: H. Albrecht, H. Ehrlichmann, T. Hamacher, A. Krüger, A. Nau, A. Nippe, M. Reidenbach, M. Schäfer, H. Schröder, H.D. Schulz, F. Sefkow, R. Wurth, R.D. Appuhn, C. Hast, G. Herrera, H. Kolanoski, A. Lange, A. Lindner, R. Mankel, M. Schieber, T. Siegmund, B. Spaan, H. Thurn, D. Töpfer, A. Walther, D. Wegener, M. Paulini, K. Reim, U. Volland, H. Wegener, R. Mundt, W. Schmidt-Parzefall, W. Funk, J. Stiewe, S. Werner, S. Ball, J.C. Gabriel, C. Geyer, A. Hölscher, W. Hofmann, B. Holzer, S. Khan, K.T. Knöpfle, J. Spengler, D.I. Britton, C.E.K. Charlesworth, K.W. Edwards, H. Kapitza, P. Krieger, R. Kutschke, D.B. MacFarlane, R.S. Orr, P.M. Patel, J.D. Prentice, S.C. Seidel, G. Tsipolitis, K. Tzamariudaki, R.G. Van de Water, T.-S. Yoon, D. Reßing, S. Schael, K.R. Schubert, K. Strahl, R. Waldi, S. Weseler, B. Boštjančič, G. Kernel, P. Križan, E. Križnič, T. Podobnik, T. Živko, H.I. Cronström, L. Jönsson, V. Balagura, M. Danilov, A. Droutskoy, B. Fominykh, A. Golutvin, I. Gorelov, F. Ratnikov, V. Lubinov, P. Pakhlov, A. Rostovtsev, A. Semenov, S. Semenov, V. Shevchenko, V. Soloshenko, I. Tichomirov, Yu. Zaitsev, R. Childers, and C.W. Darden
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, media_common.quotation_subject, Electron–positron annihilation, DESY, Parity (mathematics), Asymmetry, computer, Storage ring, media_common, computer.programming_language
Abstract: Using the ARGUS detector at the e + e − storage ring DORIS II at DESY, we have observed parity violation in the decay Λ ± c → Λπ ± . We measure the coefficient of parity violation, α Λ c , to be −0.96±0.42. In addition, we measure σ BR ( Λ + c → Λπ + and σ BR ( Λ + c → Σ 0 π + ) to be, respectively, (2.2±0.3±0.4) pb and (2.0±0.7±0.4) pb.
Published: 1992
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39. Observations of Λc+ semileptonic decay

Author: U. Volland, H. Schröder, G. Herrera, A. Droutskoy, Leif J. Jönsson, K. Tzamariudaki, T. Oest, S. Werner, R. Waldi, C. Geyer, C. Hast, T. S. Yoon, J. Stiewe, V. Shevchenko, B. Boštjančič, Mikhail Danilov, A. Lange, I. Tichomirov, Sally Seidel, R. S. Orr, B. Fominykh, A. Linder, G. Kernel, H. Wegener, D. Wegener, D. Töpfer, S. Weseler, P. Krieger, T. Siegmund, T. Podobnik, Holger Schulz, A. Semenov, K. W. Edwards, A. Nau, Sergey Semenov, J. C. Gabriel, K. R. Schubert, Werner Hofmann, G. Tsipolitis, J. D. Prentice, Stefan Schael, Hermann Kolanoski, H. I. Cronström, Dave Britton, H. Kapitza, H. Ehrlichmann, F. Sefkow, Fedor Ratnikov, T. Živko, V. Balagura, V. Soloshenkp, K. T. Knöpfle, W. Schmidt-Parzefall, A. Rostovtsev, A. Krüger, M. Reidenbach, R. G. Van de Water, R. D. Appuhn, C. E. K. Charlesworth, A. Walther, M. Schieber, M. Schäfer, K. Reim, S. Khan, B. Spaan, W. Funk, P. M. Patel, Robert K. Kutschke, Yu. Zaitsev, Rainer Mankel, John D. Spengler, P. Križan, A. Golutvin, H. Albrecht, B. Holzer, R. Wurth, A. Hölscher, R. Childers, E. Križnič, I. V. Gorelov, A. Nippe, D. B. Macfarlane, R. Mundt, H. Thurn, Manfred Paulini, V. Lubimov, C. W. Darden, S. Ball, D. Ressing, Thomas Hamacher, Anton Babaev, and K. Strahl
Subjects: Semileptonic decay, Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Muon, Branching fraction, Electron–positron annihilation, Analytical chemistry, Wave function, computer, Lepton, computer.programming_language
Abstract: Direct observations of the semileptonic decay of Λc+ in the decay channels Λc+→Λe+X and Λc+→Λμ+X have been made using the ARGUS detector at the DORIS II e+e− storage ring. The cross section times branching ratio were found to be σ(e+e−→Λc+X)·BR(Λc+→Λe+X)=4.20±1.28±0.71 pb and σ(e+e−→Λc+X)·BR(Λc+→Λμ+X)=3.91±2.02±0.90 pb.
Published: 1991
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40. Inclusive production ofD 0,D + andD *(2010)+ mesons inB decays and nonresonante + e − annihilation at 10.6 GeV

Author: S. Weseler, Robert K. Kutschke, H. Wegener, K. T. Knöpfle, P. Križan, A. Golutvin, H. Ehrlichmann, T. Siegmund, A. Hölscher, Mikhail Danilov, J. Stiewe, B. Fominykh, D. Wegener, E. Križnič, Holger Schulz, A. Semenov, Peter Krieger, Werner Hofmann, B. Holzer, I. V. Gorelov, J. C. Gabriel, T. Živko, Leif J. Jönsson, K. R. Schubert, K. W. Edwards, A. Nippe, R. Mundt, T. Oest, S. Ball, A. Nau, M. Schieber, H. Thurn, C. Geyer, C. Hast, Sergey Semenov, A. Lange, K. Strahl, Hermann Kolanoski, Stefan Schael, Sally Seidel, H. Kapitza, K. Reim, V. Lubimov, P. M. Patel, G. Herrera, C. W. Darden, K. Tzamariudaki, Manfred Paulini, W. Schmidt-Parzefall, Rainer Mankel, Fedor Ratnikov, C. E. K. Charlesworth, D. B. MacFarlane, R. D. Appuhn, G. Kernel, G. Schweda, M. Reidenbach, R. Childers, A. Droutskoy, R. S. Orr, Thomas Hamacher, M. Schäfer, U. Volland, V. Soloshenko, T. S. Yoon, Georgios Tsipolitis, Dave Britton, F. Sefkow, D. Ressing, B. Spaan, W. Funk, Anton Babaev, V. Balagura, A. Lindner, H. Schröder, A. Krüger, R. G. Van de Water, B. Boštjančič, S. Khan, R. Waldi, H. I. Cronström, J. D. Prentice, G. Harder, Yu. Zaitsev, S. Werner, A. Rostovtsev, V. Shevchenko, I. Tichomirov, John D. Spengler, H. Albrecht, R. Wurth, and A. Walther
Subjects: Physics, Particle physics, Argus, Annihilation, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, DESY, Elementary particle, Spectral line, Nuclear physics, Mass spectrum, Engineering (miscellaneous), computer, computer.programming_language
Abstract: Using the ARGUS detector at thee+e− storage ring DORIS II at DESY, we have measured the inclusive production ofD0,D+ andD*(2010)+ mesons inB decays and in nonresonante+e− annihilation around 10.6 GeV. The inclusive branching ratios forB decays toD0,D+ andD*+ mesons are found to be (52.2±8.2±3.5)%, (27.2±6.3±3.5)% and (34.8±6.0±3.5)% respectively. Thus,D0 andD+ production account for about 70% of the charm produced inB decays, neglectingb→u contributions to the total width. The production cross sections and momentum spectra for continuume+e− annihilation are also presented.
Published: 1991
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41. Observation of the decay τ → ϱππντ

Author: K. W. Edwards, U. Volland, Sally Seidel, D. Wegener, M. Schieber, Dave Britton, Holger Schulz, A. Nau, F. Sefkow, V. Lubimov, J. D. Prentice, C. Geyer, C. Hast, D. Ressing, Anton Babaev, Sergey Semenov, G. Tsipolitis, Hermann Kolanoski, A. Lange, T. Živko, R. Childers, A. Droutskoy, I. V. Gorelov, S. Weseler, R. S. Orr, A. Walter, J. Stiewe, A. Lindner, C. W. Darden, R. D. Appuhn, H. Ehrlichmann, Thomas Hamacher, V. Soloshenko, A. Semenov, W. Hoffmann, J. C. Gabriel, H. I. Cronström, H. Schröder, Mikhail Danilov, M. Schäfer, I. Tichomirov, R. Waldi, B. Fominykh, B. Holzer, B. Spaan, W. Funk, R. Mundt, Stefan Schael, K. Strahl, J. A. Parsons, H. Kapitza, G. Kernel, John D. Spengler, V. Shevchencko, K. T. Knöpfle, H. Thurn, K. Reim, H. Albrecht, P. Krieger, R. Wurth, Rainer Mankel, B. Boštjančič, K. R. Schubert, Fedor Ratnikov, M. Reidenbach, S. Ball, T. S. Yoon, W. Schmidt-Parzefall, C. E. K. Charlesworth, H. Wegener, G. Schweda, V. Balagura, Manfred Paulini, A. Krüger, T. Siegmund, R. G. Van de Water, S. Khan, G. Herrera, K. Tzamariudaki, Leif J. Jönsson, T. Oest, S. Werner, E. Križnič, A. Rostovtsev, P. M. Patel, A. Nippe, D. B. Macfarlane, Yu. Zaitsev, Robert K. Kutschke, P. Križan, A. Golutvin, and A. Hölscher
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Pion, Meson, Electron–positron annihilation, computer, computer.programming_language
Abstract: An analysis of the decay τ− → π−π−π+π0ντ has been performed with the ARGUS detector at the DORIS II storage ring. From a study of the two pion subsystems we have found first evidence for the decays τ− → ϱ0π−π0ντ, τ− → ϱ −π+π−ντ, and τ− → ϱ+π−π−ντ with relative contributions to the decay τ− → π−π−π+π0ντ of 0.30 ± 0.04, 0.26 ± 0.05, and 0.10 ± 0.03, respectively. The fraction of the subchannel τ− → ωπ−ντ has been determined to be 0.33 ± 0.05. The production of ϱ mesons is enhanced by a factor of 1.9 ± 0.3 over that of ω mesons. We conclude that in more than 81% (95% CL) of all τ− → π−π−π+π0ντ decays either a ϱ or ω meson is produced.
Published: 1991
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42. Observation of the decays Ds−→φe− and D−→K∗0e−

Author: D. Wegener, S. Weseler, R. Mundt, H. Ehrlichmann, T. Siegmund, Mikhail Danilov, H. Thurn, G. Schweda, R. Waldi, A. Rostovtsev, S. Ball, C. Geyer, C. Hast, V. Lubimov, J. D. Prentice, K. Reim, Rainer Mankel, H. Albrecht, Leif J. Jönsson, A. Lange, M. Schieber, B. Fominykh, R. Wurth, Manfred Paulini, G. Herrera, R. S. Orr, W. Schmidt-Parzefall, T. Oest, Thomas Hamacher, V. Soloshenko, C. E. K. Charlesworth, C. W. Darden, Sally Seidel, K. Tzamariudaki, Holger Schulz, B. Spaan, W. Funk, P. Krieger, A. Nau, A. Semenov, H. Schröder, J. C. Gabriel, Sergey Semenov, Werner Hofmann, Stefan Schael, J. Spengler, H. Kapitza, G. Tsipolitis, H. Wegener, Hermann Kolanoski, T. Živko, G. Kernel, K. Strahl, Vladislav Balagura, R. D. Appuhn, K. W. Edwards, V. Shevchenko, A. Nippe, Fedor Ratnikov, D. B. Macfarlane, M. Schäfer, M. Reidenbach, I. Tichomirov, Dave Britton, K. T. Knöpfle, K. R. Schubert, H. I. Cronström, Robert K. Kutschke, F. Sefkow, P. Križan, A. Golutvin, R. Childers, A. Droutskoy, B. Boštjančič, A. Walther, A. Hölscher, B. Holzer, U. Volland, I. V. Gorelov, A. Lindner, J. Stiewe, D. Ressing, Anton Babaev, P. M. Patel, Yu. Zaitsev, S. Werner, T. S. Yoon, A. Krüger, R. G. Van de Water, and S. Khan
Subjects: Physics, Nuclear and High Energy Physics, Argus, Meson, Branching fraction, Electron–positron annihilation, Continuum (design consultancy), DESY, Electron, Atomic physics, computer, computer.programming_language
Abstract: Using the ARGUS detector at the e + e − storage ring DORIS II at DESY, we have studied semileptonic charmed meson decays through ф- and K ∗0 -electron correlations in continuum production. Evidence for the decay D − s →фe − v has been observed, with a branching ratio relative to the channel D − s →фπ − determined to be 0.57±0.15±0.15. The decay D − →K ∗0 e − v was also seen, with a value of 0.55±0.08±0.10 extracted for the branching ratio relative to the channel D − →K + π − π − . The ratio of the two measurements, after application of SU(3) corrections, implies a branching ratio for D − s →фπ − of (2.4±1.0)%.
Published: 1991
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43. Search for rare B decays

Author: P. Pakhlov, S. Weseler, K. T. Knöpfle, Ivan Belyaev, Sergey Barsuk, W. Schmidt-Parzefall, Axel Lindner, R. Schwierz, A. Nau, Sergey Semenov, J. Spengler, H. Schröder, J. Graf, T. Siegmund, Hermann Kolanoski, H. Kuipers, D. Töpfer, I. Korolko, R. Mundt, C. Frankl, S. Werner, M. Schmidtler, D. B. MacFarlane, G. Kernel, R. Chistov, R. Waldi, H. Thurn, A. Lange, L. Gershtein, O. Mai, E. Križnič, Holger Schulz, R. P. Hofmann, P. R.B. Saull, J. Stiewe, M. Schieber, T. Kirchhoff, R. G. Van de Water, P. Krieger, M. Walter, D. Reßing, T. Živko, K. Tzamariudaki, C. Hast, Michael Schneider, Vladislav Balagura, T. S. Yoon, P. Eckstein, H. Wegener, D. O. Litvintsev, H. Kapitza, Thomas Hamacher, P. Križan, T. Podobnik, B. Spaan, K. Reim, K. Ehret, G. Kostina, H. Albrecht, R. Reiner, R. Mankel, R. Wurth, T. Oest, R. Eckmann, Yu. Zaitsev, A. Hüpper, A. Golutyin, A. Snizhko, J. D. Prentice, I. Tichomirov, Klaus R. Schubert, Mikhail Danilov, A. Kosche, Yuri Gershtein, Sebastian Nowak, D. Wegener, M. Schramm, and Werner Hofmann
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Argus, Electron–positron annihilation, B meson, DESY, computer, Storage ring, Particle Physics - Experiment, computer.programming_language
Abstract: Using the ARGUS detector at the e+e− storage ring DORIS II at DESY, we have searched for decays b → sgluon through full reconstruction of a whole event. Two B B decays were found with one of B meson decaying into a final state without charmed particles. We also obtained an upper limit of Br(B+ → τ+ντ) of 1.04% at 90% CL.
Published: 1995

44. The ARGUS microvertex drift chamber

Author: T. Siegmund, R. D. Appuhn, J. D. Prentice, S. Ball, D. B. Macfarlane, Sally Seidel, W. Schmidt-Parzefall, K. W. Edwards, M. O'Neill, A. Lange, I. Tichomirov, B. Kreimeier, M. Danilov, G. Tsipolitis, Hermann Kolanoski, J. Buchmüller, R. Fernholz, A. Walther, E. Michel, J. A. Parsons, H. Kapitza, and Anton Babaev
Subjects: Physics, Nuclear and High Energy Physics, Argus, Physics::Instrumentation and Detectors, business.industry, Scattering, Detector, Readout electronics, Vertex (geometry), Optics, Upgrade, business, Instrumentation, computer, Bar (unit), computer.programming_language
Abstract: The ARGUS collaboration is currently building a new microvertex drift chamber (μVDC) as an upgrade of their detector. The μVDC is optimized for B-meson physics at DORIS energies. Important design features are minimal multiple scattering for low-momentum particles and three-dimensional reconstruction of decay vertices with equal resolutions in r - φ and r - z . Vertex resolutions of 15–25 μm are expected. Prototypes of the μVDC have been tested with different gas mixtures at various pressures. Spatial resolutions as small as 20 μm were obtained using CO 2 /propane at 4 bar and DME at 1 bar. New readout electronics have been developed for the μVDC aiming at low thresholds for the TDC measurements. Employing a novel idea for noise and cross-talk suppression, which is based on a discrimination against short pulses, very low threshold settings are possible.
Published: 1989
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