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Start Over Author "Droutskoy, A." Topic nuclear and high energy physics
29 results on '"Droutskoy, A."'

1. 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

2. 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

3. 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

4. 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

5. Determination of the structure of τ decays in the reaction and a precision measurement of the τ-neutrino helicity

Author

I. Tichomirov, A. Lange, Ivan Belyaev, T. Oest, O. Mai, E. Križnič, Vladislav Balagura, S. Weseler, T. Kirchhoff, R. Mundt, Sebastian Nowak, D. Wegener, D. O. Litvintsev, A. Snizhko, H. Thurn, Mikhail Danilov, D. Töpfer, T. S. Yoon, B. Spaan, I. Korolko, J. D. Prentice, Axel Lindner, V. Lubimov, A. Kosche, Yuri Gershtein, J. Stiewe, M. Schramm, S. Werner, P. Pakhlov, H. Wegener, W. Schmidt-Parzefall, M. Schmidtler, D. Reßing, C. Hast, Michael Schneider, D. B. MacFarlane, R. Waldi, T. Podobnik, R. P. Hofmann, P. R.B. Saull, Werner Hofmann, A. Hüpper, Thomas Hamacher, H. Kapitza, M. Walter, P. Krieger, H. Albrecht, R. Mankel, A. Droutskoy, P. Križan, A. Golutvin, R. Wurth, Holger Schulz, C. Frankl, R. Eckmann, Yu. Zaitsev, P. Eckstein, T. Živko, H. Kuipers, R. Schwierz, H. Schröder, T. Siegmund, K. Reim, A. Nau, Sergey Semenov, Hermann Kolanoski, S. Chechelnitsky, K. Ehret, G. Kostina, R. Reiner, M. Schieber, K. Tzamariudaki, R. G. Van de Water, K. R. Schubert, J. Spengler, G. Kernel, and K. T. Knöpfle

Subjects
Physics, Pseudoscalar, Nuclear and High Energy Physics, Particle physics, Absolute value, Neutrino, Helicity, Pseudovector, Standard Model, Spin-½, Lepton
Abstract

Using the ARGUS detector at the DORIS II storage ring we have investigated the Lorentz structure of the electroweak interaction in semi-hadronic τ decays. Spin correlations in the process e + e − → τ + τ − → v τ π + π 0 v τ π − π 0 are exploited for a measurement of the normalized product of the vector ( g V ) and axial vector ( g A ) couplings of the τ lepton, γin AV = 2 Re {g A g V ∗ } (|g V | 2 ) . The correlations are sensitive to the product of the couplings in both τ decays: γ AV 2 = γ AV (τ − → ν τ W − ) AV = −h(v τ )h( v τ ) . The measured value, γ AV 2 = 1.044±0.057±0.060, determines the relative sign of the neutrino helicities. Assuming CP invariance, the absolute value | γ AV | = 1.022±0.028±0.030 was found to be incellent agreement with the Standard Model. The contribution of scalar ( g s ) or pseudoscalar ( g P ) couplings was also investigated. No evidence for a scalar-like coupling was found.

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. 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

8. 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

9. 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

10. A study of mixing using partial reconstruction

Author

R. Mundt, R. Waldi, H. Thurn, D. B. MacFarlane, C. Hast, M. Seeger, A. Droutskoy, K. Reim, A. Lange, Rainer Mankel, Manfred Paulini, M. Schmidtler, R. P. Hofmann, P. R.B. Saull, S. Werner, K. R. Schubert, S. Chechelnitsky, D. O. Litvintsev, P. Pakhlov, A. Hüpper, B. Spaan, A. Nau, Sergey Semenov, V. Lubimov, T. Siegmund, T. Kirchhoff, Hermann Kolanoski, I. Korolko, Sebastian Nowak, Holger Schulz, S. Weseler, D. Wegener, K. Ehret, T. Živko, T. S. Yoon, K. T. Knöpfle, W. Schmidt-Parzefall, I. Tichomirov, H. Ehrlichmann, A. Snizhko, G. Kostina, J. D. Prentice, Ivan Belyaev, Thomas Hamacher, P. Krieger, Mikhail Danilov, J. Stiewe, R. Reiner, A. Kosche, J. Spengler, D. Töpfer, Yuri Gershtein, D. Reßing, Werner Hofmann, Vladislav Balagura, H. Albrecht, C. E.K. Charlesworth, G. Kernel, R. Wurth, R. Eckmann, Yu. Zaitsev, K. W. Edwards, H. Wegener, M. Schieber, K. Tzamariudaki, P. M. Patel, M. Walter, H. Kapitza, E. Križnič, T. Podobnik, H. Schröder, M. Schnieder, T. Oest, P. Križan, A. Golutvin, R. G. Van de Water, S. Khan, E. R.F. Hyatt, P. Eckstein, Dave Britton, and A. Lindner

Subjects
Physics, Nuclear and High Energy Physics, Meson, Branching fraction, Electron–positron annihilation, Analytical chemistry, B meson, Atomic physics, Lepton
Abstract

Using the ARGUS detector at the e + e − storage ring DORIS II at DESY, we have studied the decay B 0 → D ∗+ l − v by exploiting a partial D ∗+ reconstruction technique. The branching ratio for this mode was thereby determined to be (4.5 ± 0.3 ± 0.4)%. Using the corresponding sample of tagged B 0 mesons, we measured the B 0 B 0 mixing parameter to be r d = 0.194 ± 0.062 ± 0.054, a result only weakly dependent upon the ratio of semileptonic widths for and production rates of B 0 and B + mesons. We have also determined the branching ratio Br ( B 0 → X l − v to be (9.3 ± 1.1 ± 1.5)%. By comparing the results for full and partial D ∗+ reconstuction we found the absolute branching ratios for D 0 → K − π + and D 0 → K − π + π + π − to be (4.5 ± 0.6 ± 0.4)% and (7.9 ± 1.5 ± 0.9)%, respectively.

Published
1994

11. 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

12. 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

13. A partial wave analysis of the decay D0 → KS0π+π−

Author

R. Mundt, J. Stiewe, D. Reßing, H. Thurn, G. Kostina, K. Reim, V. Shibaev, A. Hüpper, V. Lubimov, Rainer Mankel, R. Reiner, A. Nau, Sergey Semenov, Hermann Kolanoski, Holger Schulz, M. Schmidtler, J. Tamminga, A. Walther, D. B. MacFarlane, Fedor Ratnikov, C. Hast, T. Kirchhoff, W. Schmidt-Parzefall, K. R. Schubert, A. Lange, T. Živko, K. T. Knöpfle, A. Droutskoy, R. G. Van de Water, S. Weseler, I. V. Gorelov, I. Tichomirov, S. Khan, K. Ehret, H. Ehrlichmann, P. Pakhlov, Sebastian Nowak, R. P. Hofmann, D. Wegener, T. S. Yoon, E.R.F. Hyatt, Peter Krieger, Mikhail Danilov, K. W. Edwards, John D. Spengler, Ivan Belyaev, H. Albrecht, Werner Hofmann, R. Wurth, K. Strahl, P. R. B. Saull, Vladislav Balagura, C. E. K. Charlesworth, D. Töpfer, Michael Schneider, T. Siegmund, M. Schieber, Manfred Paulini, H. Kapitza, P. M. Patel, A. Lindner, G. Kernel, H. Wegener, Thomas Hamacher, V. Soloshenko, T. Podobnik, M. Walter, T. Oest, H. Schröder, B. Spaan, W. Funk, R. D. Appuhn, K. Tzamariudaki, P. Križan, A. Golutvin, Dave Britton, E. Križnič, P. Murat, R. Waldi, J. D. Prentice, S. Werner, and Yu. Zaitsev

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle decay, Pion, Pair production, Meson, Branching fraction, Partial wave analysis, Excited state, Analytical chemistry, Dalitz plot
Abstract

Using the ARGUS detector at the DORIS-II electron-positron storage ring at DESY, we have investigated the exclusive decay D ∗+ → D 0 π + , D 0 → K S 0 π + π − . From a partial wave analysis of the KS0π+π− system we find that (71.8± 4.2 ± 3.0)% are D 0 → K ∗− π + and (22.7 ± 3.2 ± 0.9)% are D 0 → K 0 ϱ 0 with a relative phase of (−137 ± 7 ± 3)° between the channels. The remaining fraction can be described by several channels involving excited resonances, but not by a three-body phase space decay, thus giving first evidence for D0 decays into K 0 ∗ (1430) − π + , K 0 f 0 (1975), K 0 f 2 (1270) , and K 0 f 0 (1400) .

Published
1993

14. 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

15. 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

16. 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

17. 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

18. 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

19. 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

20. 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

21. 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

22. 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

23. 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

24. 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

25. 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

26. 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

27. 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

28. 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

29. 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

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