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1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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

12. Investigation of the decays $$\bar B^0 \to D^{* + } \ell ^ - \bar v$$ and $$\bar B \to D^{**} \ell ^ - \bar v$$

Author: T. Siegmund, K. Strahl, Vladislav Balagura, A. Nau, Sergey Semenov, Hermann Kolanoski, P. Pakhlov, P. Križan, S. Werner, C. E. K. Charlesworth, V. Lubimov, A. Golutvin, W. Schmidt-Parzefall, M. Bittner, D. B. MacFarlane, G. Kostina, Mikhail Danilov, C. Hast, J. D. Prentice, A. Lange, P. R. B. Saull, A. Droutskoy, H. Schröder, Manfred Paulini, E.R.F. Hyatt, K. W. Edwards, Yuri Gershtein, R. P. Hofmann, Ivan Belyaev, T. S. Yoon, R. Reiner, Holger Schulz, Peter Krieger, E. Križnič, T. Oest, Werner Hofmann, I. Tichomirov, Michael Schneider, M. Schieber, R. G. Van de Water, R. Waldi, Thomas Hamacher, V. Soloshenko, T. Živko, D. Töpfer, M. Schmidtler, A. Walther, H. Wegener, S. Khan, H. Albrecht, B. Spaan, R. Mundt, W. Funk, T. Podobnik, K. R. Schubert, S. Chechelnitsky, R. Wurth, Yu. Zaitsev, H. Thurn, T. Kirchhoff, K. Tzamariudaki, A. Hüpper, K. Ehret, H. Kapitza, Fedor Ratnikov, R. D. Appuhn, P. Eckstein, S. Weseler, Dave Britton, P. M. Patel, H. Ehrlichmann, J. Spengler, M. Walter, K. Reim, G. Kernel, Rainer Mankel, Sebastian Nowak, D. Wegener, K. T. Knöpfle, J. Stiewe, A. Lindner, D. Reßing, V. Shibaev, and I. V. Gorelov
Subjects: Physics, Argus, Particle physics, Physics and Astronomy (miscellaneous), Meson, Branching fraction, High Energy Physics::Phenomenology, Elementary particle, High Energy Physics::Experiment, Engineering (miscellaneous), computer, Astrophysics::Galaxy Astrophysics, computer.programming_language, Bar (unit)
Abstract: Exclusive semileptonicB decays with aD *+ meson in the final state have been studied using the ARGUS detector at the DORIS II storage ring. The branching ratio for the decay $$\bar B^0 \to D^{* + } \ell ^ - \bar v$$ , where l- is eithere − or μ-, has been measured to be (5.2±0.5±0.6)%. A significant rate for the decay $$\bar B \to D^{**} \ell ^ - \bar v$$ has been observed. From an angular analysis of the cascade $$\bar B^0 \to D^{* + } ( \to D^0 \pi ^ + )\ell ^ - \bar v$$ the forward-backward asymmetryA FB and theD *+ polarization parameter α have been determined to beA FB=0.20±0.08±0.06 and α=1.1±0.4±0.2.
Published: 1993

13. 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

14. 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

15. 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

16. 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

17. 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

18. 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

19. 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

20. Observation of the decay

Author: H. Schröder, P. R. B. Saull, M. Schieber, J. D. Prentice, K. Strahl, Vladislav Balagura, S. Werner, A. Droutskoy, Ivan Belyaev, P. Pakhlov, Mikhail Danilov, T. S. Yoon, G. Kostina, Manfred Paulini, R. P. Hofmann, I. Tichomirov, A. Walther, A. Linder, R. Reiner, V. Shibaev, K. R. Schubert, C. Hast, M. Walter, R. G. Van de Water, K. Reim, Werner Hofmann, K. W. Edwards, T. Siegmund, Dave Britton, H. Wegener, H. I. Cronström, A. Hüpper, A. Lange, D. Töpfer, P. Krieger, S. Khan, Michael Schneider, K. Ehret, Fedor Ratnikov, T. Podobnik, Holger Schulz, P. Murat, E. Križnič, Rainer Mankel, B. Spaan, W. Funk, T. Kirchhoff, M. Schmidtler, Sebastian Nowak, K. Tzamariudaki, W. Schmidt-Parzefall, R. Waldi, D. Wegener, K. T. Knöpfle, T. Živko, H. Kapitza, C. E. K. Charlesworth, I. V. Gorelov, D. B. Macfarlane, R. D. Appuhn, V. Lubinov, R. Mundt, John D. Spengler, G. Kernel, Leif J. Jönsson, P. Križan, A. Golutvin, H. Albrecht, D. Reβing, H. Thurn, P. M. Patel, J. Stiewe, T. Oest, S. Weseler, R. Wurth, E.R.F. Hyatt, Yu. Zaitsev, H. Ehrlichmann, A. Nau, Sergey Semenov, Hermann Kolanoski, Thomas Hamacher, and V. Soloshenko
Subjects: Physics, Nuclear and High Energy Physics, Argus, Meson, Electron–positron annihilation, Analytical chemistry, Value (computer science), DESY, Excited state, Mass spectrum, Atomic physics, computer, Storage ring, computer.programming_language
Abstract: Using the ARGUS detector at the e + e - storage ring using DORIS II at DESY, we have observed a new decay channel for the excited charm-strange meson D s1 (2536) + →D∗ O K + . The production cross section for the D s 1 (2536) + decaying via this channel is measured to be σ ( D s1 (2536) + )· BR (D sl (2536) + →D∗ 0 K + )= 18±4±3 pb at E CM = 10.4 GeV. The mass of the D s 1 (2536) + is found to be 2535.2 ± 0.5±1.5 MeV/ c 2 in agreement with the value obtained from an analysis of the D s1 (2536) + →D∗ + K 0 s decay channel. The natural width is determined to be less than 3.9 MeV/ c 2 at 90%CL.
Published: 1992

21. 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

22. 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

23. 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

24. 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

25. 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

26. 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

27. 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

28. 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

29. 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

30. 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

31. 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

32. 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

33. 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

34. 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

35. Study ofpp and ΛΛ production ine + e − annihilation at 10 GeV center of mass energy

Author: K. Reim, D. Wegener, R. S. Orr, K. R. Schubert, C. Geyer, U. Volland, Rainer Mankel, C. Hast, T. S. Yoon, V. Lubimov, E. Križnič, A. Lange, Leif J. Jönsson, R. D. Appuhn, W. Schmidt-Parzefall, A. Nippe, H. Schröder, S. Ball, Yu. Zaitsev, M. Schäfer, T. Oest, Fedor Ratnikov, C. W. Darden, S. Weseler, I. V. Gorelov, J. D. Swain, A. Drescher, M. Schieber, Holger Schulz, M. Reidenbach, Robert K. Kutschke, Peter Krieger, H. Ehrlichmann, J. Stiewe, B. Spaan, W. Funk, P. Križan, A. Golutvin, B. Holzer, T. Živko, I. Tichomirov, A. Semenov, S. Werner, J. C. Gabriel, Anton Babaev, A. Krüger, D. B. MacFarlane, A. Nau, A. Hölscher, T. Ruf, Sergey Semenov, R. Waldi, B. Boštjančič, P. M. Patel, H. Wegener, K. W. McLean, J. Spengler, S. Khan, Hermann Kolanoski, K. Strahl, Georgios Tsipolitis, Dave Britton, Mikhail Danilov, A. Rostovtsev, Sally Seidel, R. Childers, A. Droutskoy, G. Kernel, F. Sefkow, B. Fominykh, V. Tchistilin, V. Soloshenko, K. W. Edwards, C. E. K. Charlesworth, Werner Hofmann, H. I. Cronström, Manfred Paulini, Stefan Schael, J. A. Parsons, H. Kapitza, G. Harder, A. Lindner, J. D. Prentice, A. W. Nilsson, R. Gläser, V. Shevchenko, H. Scheck, H. Albrecht, R. Wurth, A. Walther, G. Schweda, G. Herrera, and K. Tzamariudaki
Subjects: Nuclear physics, Physics, Argus, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Center of mass, Engineering (miscellaneous), computer, Energy (signal processing), computer.programming_language
Published: 1991

36. 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

37. A spin-parity analysis of γγ→ϱ+ϱ−

Author: K. W. Edwards, A. Semenov, J. C. Gabriel, S. Werner, V. Lubimov, M. Schieber, G. Schweda, R. Childers, John D. Spengler, C. W. Darden, U. Volland, Fedor Ratnikov, S. Weseler, M. Reidenbach, Leif J. Jönsson, C. Geyer, K. T. Knöpfle, G. Herrera, H. Albrecht, A. Rostovtsev, C. Hast, H. Ehrlichmann, Robert K. Kutschke, R. Wurth, A. Lange, P. Križan, P. M. Patel, A. Golutvin, T. Oest, Sally Seidel, R. S. Orr, K. Tzamariudaki, W. Schmidt-Parzefall, Holger Schulz, Thomas Hamacher, V. Soloshenko, K. Reim, A. Hölscher, J. D. Prentice, C. E. K. Charlesworth, I. V. Gorelov, Yu. Zaitsev, K. Strahl, P. Križnič, T. Živko, Mikhail Danilov, Rainer Mankel, A. Droutskoy, H. Wegener, B. Fominykh, R. Mundt, T. Siegmund, A. Nippe, K. R. Schubert, D. B. Macfarlane, Werner Hofmann, A. Nau, A. Walther, H. Thurn, Sergey Semenov, G. Tsipolitis, Hermann Kolanoski, G. Kernel, Stefan Schael, B. Boštjančič, H. Kapitza, V. Shevchenko, I. Tichomirov, P. Krieger, D. Ressing, R. Waldi, B. Holzer, Anton Babaev, B. Spaan, W. Funk, T. S. Yoon, R. D. Appuhn, M. Schäfer, A. Lindner, D. Wegener, Dave Britton, F. Sefkow, H. I. Cronström, H. Schröder, S. Ball, V. Balagura, Manfred Paulini, A. Krüger, R. G. Van de Water, S. Khan, and J. Stiewe
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, Amplitude, Parity (physics), DESY, computer, computer.programming_language
Abstract: A spin-parity analysis of the ϱ + ϱ − system in the reaction γγ→ϱ + ϱ − →Π + Π − Π 0 Π 0 has been performed using the ARGUS detector at the e + e − storage ring DORIS II at DESY. The cross section is found to be dominated by the amplitudes J P = 0 + and J P = 2 + ( J z = 2).
Published: 1991

38. 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

39. 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

40. Exclusive hadronic decays ofB mesons

Author: Anton Babaev, S. Ball, T. S. Yoon, A. Lindner, Holger Schulz, G. Schweda, K. R. Schubert, K. W. McLean, B. Holzer, H. I. Cronström, K. Strahl, T. Živko, V. Soloshenko, Manfred Paulini, H. Schröder, Leif J. Jönsson, J. D. Prentice, A. W. Nilsson, H. Scheck, S. Khan, T. Ruf, G. Herrera, R. D. Appuhn, V. Lubimov, S. Weseler, T. Oest, M. Schäfer, John D. Spengler, K. Tzamariudaki, W. Schmidt-Parzefall, B. Boštjančič, D. Wegener, R. S. Orr, K. W. Edwards, H. Ehrlichmann, B. Spaan, C. W. Darden, W. Funk, H. Wegener, D. B. MacFarlane, Peter Krieger, U. Volland, A. Drescher, H. Albrecht, A. Krüger, Sally Seidel, I. V. Gorelov, A. Nau, R. Childers, Sergey Semenov, M. Schieber, Stefan Schael, Yu. Zaitsev, J. Stiewe, A. Droutskoy, Georgios Tsipolitis, C. E. K. Charlesworth, Hermann Kolanoski, Dave Britton, J. A. Parsons, R. Wurth, H. Kapitza, A. Walther, F. Sefkow, P. M. Patel, E. Križnič, K. Reim, R. Waldi, V. Shevchenko, I. Tichomirov, A. Nippe, G. Kernel, V. Tchistilin, Rainer Mankel, G. Harder, C. Geyer, C. Hast, A. Lange, S. Werner, A. Semenov, J. C. Gabriel, A. Rostovtsev, Fedor Ratnikov, M. Reidenbach, Mikhail Danilov, B. Fominykh, Werner Hofmann, Robert K. Kutschke, P. Križan, A. Golutvin, and A. Hölscher
Subjects: Physics, Argus, Particle physics, Strange quark, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Hadron, Nuclear physics, Pion, CP violation, B meson, Engineering (miscellaneous), computer, computer.programming_language
Abstract: Using the ARGUS detector at thee + e − storage ring DORIS II, we have measuredB decays into exclusive final states containing aD orD * meson plus several pions, or containing aJ/ψ or ψ′ meson plus a strange particle. Some of these channels have not been seen before, while others represent updated measurements of previous results. The branching ratios are compared with the predictions of the model of Bauer, Stech and Wirbel. Using the cleanest decay channels, the mass of the charged and neutralB meson are found to bem B −=(5280.5±1.0±2.0) MeV/c2 andm B 0=(5279.6±0.7±2.0) MeV/c2 respectively, yielding a mass differencem B 0−m B − =(−0.9±1.2±0.5) MeV/c2.
Published: 1990

41. Determination of the tau-neutrino helicity

Author: V. Lubimov, E. Križnič, Leif J. Jönsson, C. Geyer, C. Hast, W. Schmidt-Parzefall, C. W. Darden, T. Oest, J. Stiewe, A. Lange, R. S. Orr, A. Nippe, D. B. Macfarlane, H. Schröder, J. D. Prentice, A. W. Nilsson, H. Scheck, John D. Spengler, S. Ball, Fedor Ratnikov, A. Drescher, H. Albrecht, A. Semenov, J. C. Gabriel, R. Wurth, K. W. McLean, M. Reidenbach, K. Strahl, A. Walther, Stefan Schael, G. Schweda, D. Wegener, A. Lindner, J. A. Parsons, V. Shevchenko, H. Kapitza, I. V. Gorelov, H. Wegener, Mikhail Danilov, I. Tichomirov, S. Werner, U. Volland, K. W. Edwards, G. Herrera, B. Fominykh, R. D. Appuhn, Manfred Paulini, Robert K. Kutschke, P. Križan, K. Tzamariudaki, A. Golutvin, G. Harder, A. Hölscher, A. Rostovtsev, Werner Hofmann, Anton Babaev, P. Krieger, M. Schäfer, V. Soloshenko, P. M. Patel, T. Ruf, H. I. Cronström, Yu. Zaitsev, C. E. K. Charlesworth, B. Boštjančič, B. Holzer, A. Krüger, B. Spaan, W. Funk, R. Waldi, Dave Britton, F. Sefkow, K. R. Schubert, G. Kernel, V. Tchistilin, Sally Seidel, Holger Schulz, M. Schieber, M. Spahn, T. Živko, A. Nau, Sergey Semenov, A. Droutskoy, G. Tsipolitis, Hermann Kolanoski, S. Weseler, H. Ehrlichmann, R. Childers, K. Reim, Rainer Mankel, T. S. Yoon, and S. Khan
Subjects: Physics, Coupling constant, Nuclear and High Energy Physics, Argus, Particle physics, Electron–positron annihilation, media_common.quotation_subject, Helicity, Asymmetry, Nuclear physics, Pion, Tau neutrino, High Energy Physics::Experiment, Neutrino, computer, computer.programming_language, media_common
Abstract: Using the ARGUS detector at the DORIS II e + e − storage ring we measured for the first time the τ neutrino helicity from a parity violating asymmetry in the τ decay into three charged pions. From the measured asymmetry we derived the normalized product of the axial and vector coupling constant 2 g A g v / ( g A 2 + g V 2 ) = 1.14±0.34 −0.17 0.34 , which is in good agreement with the standard model prediction.
Published: 1990

42. Study of inclusive semileptonic B meson decays

Author: Sally Seidel, U. Volland, Holger Schulz, G. Schweda, Mikhail Danilov, M. Spahn, T. Živko, B. Fominykh, Leif J. Jönsson, T. Oest, A. Droutskoy, V. Lubimov, H. I. Cronström, Werner Hofmann, H. Wegener, W. Schmidt-Parzefall, E. Križnič, P. M. Patel, C. W. Darden, J. D. Prentice, A. W. Nilsson, A. Semenov, K. W. Edwards, Fedor Ratnikov, B. Holzer, Yu. Zaitsev, S. Werner, Stefan Schael, J. A. Parsons, J. C. Gabriel, Dave Britton, G. Herrera, M. Reidenbach, H. Kapitza, K. Reim, Rainer Mankel, H. Schröder, K. W. McLean, K. Tzamariudaki, T. Ruf, F. Sefkow, A. Nippe, D. B. Macfarlane, J. D. Swain, K. Strahl, A. Rostovtsev, C. E. K. Charlesworth, G. Harder, C. Geyer, C. Hast, T. S. Yoon, P. Krieger, I. V. Gorelov, A. Lange, J. Stiewe, R. Childers, R. S. Orr, A. Nau, Sergey Semenov, G. Tsipolitis, Hermann Kolanoski, R. D. Appuhn, S. Weseler, K. R. Schubert, A. Walther, R. Waldi, H. Scheck, M. Schäfer, John D. Spengler, H. Ehrlichmann, A. Krüger, H. Albrecht, B. Spaan, W. Funk, R. Wurth, V. Shevchenko, I. Tichomirov, A. Drescher, S. Khan, Anton Babaev, Manfred Paulini, A. Lindner, S. Ball, R. Gläser, D. Wegener, V. Soloshenko, B. Boštjančič, Robert K. Kutschke, P. Križan, A. Golutvin, A. Hölscher, G. Kernel, V. Tchistilin, and M. Schieber
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Argus, Muon, Electron–positron annihilation, Resonance, Electron, Baryon, Nuclear physics, B meson, computer, computer.programming_language, Lepton
Abstract: Using the ARGUS detector at the e + e − storage ring DORIS-II, we have measured the inclusive semileptonic decays of B-mesons into electrons and muons. The data originate from 220.5 events/pb on the ϒ(4S) resonance. We find BR (B→e + v e X = (10.3 ± 0.6 ± 0.2)% and BR (B→ μ + v μ X) = (10.0 ± 0.6 ± 0.2)% using the model of Altarelli et al. for extrapolating over all lepton momenta, and BR (B→e + v e X) = (9.9±0.6)%, BR(B→ μ + v μ X) = (9.7±0.6)% using the model of Grinstein et al. For semileptonic decays into baryons, we obtain an upper limit of BR ( B → p e + v X ) CL ) .
Published: 1990

43. Measurement of Ξc production in e+e− annihilation at 10.5 GeV center-of-mass energy

Author: A. Lindner, A. Rostovtsev, C. Geyer, C. Hast, H. Scheck, S. Werner, D. Wegener, P. M. Patel, B. Spaan, Anton Babaev, W. Funk, A. Walther, A. Lange, T. S. Yoon, Yu. Zaitsev, R. S. Orr, H. Albrecht, R. Childers, K. W. McLean, Fedor Ratnikov, K. Strahl, R. Wurth, M. Reidenbach, Stefan Schael, A. Droutskoy, J. A. Parsons, H. Wegener, I. Tichomirov, A. Semenov, H. Kapitza, U. Volland, H. Schröder, J. C. Gabriel, K. W. Edwards, K. Reim, A. Drescher, G. Harder, R. D. Appuhn, V. Soloshenko, V. Lubimov, K. R. Schubert, P. Krieger, Mikhail Danilov, Leif J. Jönsson, M. Schäfer, W. Schmidt-Parzefall, Rainer Mankel, A. Krüger, B. Fominykh, T. Oest, T. Ruf, S. Weseler, V. Shevchenko, S. Khan, Werner Hofmann, C. W. Darden, R. Waldi, Dave Britton, H. Ehrlichmann, C. E. K. Charlesworth, J. D. Prentice, B. Holzer, A. W. Nilsson, F. Sefkow, H. I. Cronström, Manfred Paulini, J. Spengler, B. Boštjančič, G. Kernel, V. Tchistilin, M. Schieber, S. Ball, J. Stiewe, Robert K. Kutschke, P. Križan, A. Golutvin, A. Hölscher, I. V. Gorelov, E. Križnič, A. Nau, Sergey Semenov, G. Tsipolitis, Hermann Kolanoski, A. Nippe, F. Heintz, D. B. Macfarlane, Sally Seidel, Holger Schulz, T. Živko, G. Herrera, K. Tzamariudaki, and G. Schweda
Subjects: Physics, Nuclear and High Energy Physics, Argus, Annihilation, Branching fraction, Electron–positron annihilation, DESY, Baryon, Nuclear physics, Isospin, Atomic physics, computer, Storage ring, computer.programming_language
Abstract: Using the ARGUS detector at the e+e− storage ring DORIS II at DESY, we have observed production of the charmed-strange baryon Ξc+ and its neutral isospin partner, the Ξc0. The Ξc+ was reconstructed in the final state Ξ−π+π+, while the Ξc0 was seen in decay to Ξ−π+ and Ξ−π+π+π−. The average Ξc fragmentation spectrum has been determined, as well as the production cross section times branching ratio for each decay mode. The charged and neutral masses were measured to be 2465.1 ± 3.6 ± 1.9 MeV/c2 and 2472.1 ± 2.7 ± 1.6 MeV/c2 respectively, corresponding to a mass-splitting, M(Ξc+) − M(Ξc0), of −7.0±4.5±2.2 MeV/c2.
Published: 1990

44. Determination of the Michel parameter in tau decay

Author: J. Spengler, A. Golutvin, Dave Britton, F. Sefkow, S. Semenov, R. D. Appuhn, M. Schäfer, B. Holzer, M. Danilov, R. Waldi, A. Nau, K. Reim, H. Schröder, M. Schieber, V. Shevchenko, H. Wegener, I. Tichomirov, G. Tsipolitis, Robert K. Kutschke, B. Boštjančič, P. Križan, Hermann Kolanoski, A. Krüger, G. Harder, T. Ruf, I. Gorelov, R. Mankel, H. Scheck, A. Hölscher, M. Reidenbach, P. Krieger, S. Weseler, V. Soloshenko, E. Križnič, A. Walther, W. Funk, C. E. K. Charlesworth, K. W. McLean, R. Wurth, A. Nippe, D. B. Macfarlane, H. I. Cronström, J. D. Prentice, Leif J. Jönsson, A. W. Nilsson, K. Strahl, Sally Seidel, H. Albrecht, K. W. Edwards, B. Fominykh, T. Oest, K. R. Schubert, V. Lubimov, G. Schweda, U. Volland, T. Živko, C. W. Darden, Stefan Schael, J. A. Parsons, G. Kernel, H. Kapitza, G. Herrera, V. Tchistilin, S. Werner, K. Tzamariudaki, W. Schmidt-Parzefall, R. Childers, Werner Hofmann, H.D. Schulz, A. Droutskoy, J. Stiewe, A. Semenov, J. C. Gabriel, H. Ehrlichmann, D. Wegener, C. Geyer, C. Hast, A. Rostovtsev, A. Lange, R. S. Orr, P. M. Patel, Yu. Zaitsev, Anton Babaev, F. Ratnikov, A. Lindner, S. Ball, Manfred Paulini, B. Spaan, A. Drescher, T. S. Yoon, and S. Khan
Subjects: Coupling constant, Physics, Nuclear and High Energy Physics, Argus, Particle physics, Muon, Electron–positron annihilation, Electron, Nuclear physics, Goldstone boson, High Energy Physics::Experiment, computer, computer.programming_language, Boson, Lepton
Abstract: Using the ARGUS detector at the DORIS II e+e− storage ring we have studied the electron and muon energy spectra in τ − → e − ν ν and τ − →μ − ν ν decays. The measured value of the Michel parameter, ρ=0.742±0.035±0.020, is in good agreement with a standard V-A coupling at the τ-ντ-W vertex. Pure V, A and V + A couplings are completely excluded by this measurement. Upper limits have been obtained for two-body tau decays, including final states with a Goldstone boson.
Published: 1990

45. Measurement ofK + K − production in γγ collisions

Author: D. B. MacFarlane, R. Childers, A. Droutskoy, B. Spaan, W. Funk, Georgios Tsipolitis, Dave Britton, F. Sefkow, Leif J. Jönsson, M. Schieber, Mikhail Danilov, E. Križnič, R. D. Appuhn, M. Schäfer, R. S. Orr, A. Lindner, T. Oest, K. W. McLean, B. Fominykh, R. Waldi, A. Nippe, G. Schweda, K. Strahl, P. M. Patel, U. Volland, Robert K. Kutschke, Werner Hofmann, V. Lubimov, I. Tichomirov, Manfred Paulini, J. D. Prentice, A. Walther, P. Križan, A. Golutvin, A. W. Nilsson, Holger Schulz, W. Schmidt-Parzefall, A. Hölscher, H. I. Cronström, C. E. K. Charlesworth, K. Reim, C. W. Darden, V. Shevchenko, H. Schröder, J. Spengler, I. V. Gorelov, T. Živko, T. Ruf, Sally Seidel, J. Stiewe, G. Kernel, Fedor Ratnikov, Anton Babaev, H. Scheck, G. Harder, A. Rostovtsev, V. Tchistilin, D. Wegener, M. Reidenbach, G. Herrera, Rainer Mankel, K. W. Edwards, H. Albrecht, K. Tzariudaki, B. Holzer, S. Ball, R. Wurth, K. R. Schubert, B. Boštjančič, V. Soloshenko, Stefan Schael, J. A. Parsons, A. Nau, Sergey Semenov, A. Semenov, J. C. Gabriel, H. Kapitza, Hermann Kolanoski, C. Geyer, C. Hast, A. Lange, Peter Krieger, S. Weseler, H. Ehrlichmann, S. Werner, Yu. Zaitsev, H. Wegener, T. S. Yoon, A. Drescher, A. Krüger, and S. Khan
Subjects: Physics, Argus, Particle physics, Physics and Astronomy (miscellaneous), Glueball, Continuum (design consultancy), Elementary particle, Helicity, Nuclear physics, Field theory (psychology), Tensor, Quantum field theory, Engineering (miscellaneous), computer, computer.programming_language
Abstract: The production of charged kaon pairs in two-photon interactions has been studied with the ARGUS detector and the topological cross section has been measured. The γγ-widths and interference parameters have been determined for the tensor mesonsf2 (1270),a2 (1318) andf′2 (1525). The helicity structure assumed for the continuum contribution has a significant effect on the result. Upper limits have been obtained for the γγ-widths of the glueball candidate statesf2 (1720) andX (2230).
Published: 1990

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