Search

Your search keyword '"Droutskoy, A."' showing total 34 results
Start Over Author "Droutskoy, A." Topic particle physics
34 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. 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

5. 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

6. 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

7. 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

8. 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

9. Inclusive production ofK *(892),ρ 0, andω(783) mesons in theϒ energy region

Author

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

Subjects
Baryon, Quark, Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Elementary particle, Vector meson, Engineering (miscellaneous), Pseudoscalar meson, Gluon
Abstract

The production ofK *+(892),K *0(892),ρ 0(770) andω(783) vector mesons inρ 0(770) events as well as in the gluonic Υ(1S) decays andρ 0(770) decays has been studied using the ARGUS detector. Combining these results with data on pseudoscalar meson, ϕ meson and baryon production collected with the same detector allow comprehensive studies of quark and gluon fragmentation. Model independent information ons quark and vector meson suppression (s/u=0.37±0.04,V/(V+P) π=0.21±0.04 andV/(V+P) K =0.34±0.03)) are derived. The data are compared with predictions from the models Jetset 7.3 and UCLA 7.31.

Published
1994

10. 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

11. 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

12. 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

13. 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

14. 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

15. 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

16. 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

17. 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

18. 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

19. Search for neutrinoless τ decays

Author

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

Subjects
Nuclear physics, Physics, Particle physics, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Elementary particle, Baryon number, Quantum field theory, Engineering (miscellaneous), Lepton
Abstract

Upper limits on branching ratios for six neutrinoless leptonic, 16 semileptonic, two radiative-leptonic, two radiative-hadronic and three purely hadronic τ decays have been determined. The results improve over previously published ones by about a factor of two. For the first time the lepton and baryon number violating decays\(\tau ^ - \to \bar p\gamma ,\tau ^ - \to \bar p\pi ^0 \) and\(\tau ^ - \to \bar p\eta \) have been investigated. The 90% confidence level (CL) limits for the corresponding branching ratios amount to 2.9×10−4, 6.6×10−4 and 1.3×10−3 respectively.

Published
1992

20. 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

21. 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

22. Measurement ofR and determination of the charged-particle multiplicity ine + e − annihilation at 13-113-113-1around 10 GeV

Author

V. Lubimov, H. Schröder, B. Holzer, W. Schmidt-Parzefall, B. Spaan, A. Nau, Sergey Semenov, W. Funk, Leif J. Jönsson, J. D. Prentice, C. W. Darden, Hermann Kolanoski, Fedor Ratnikov, M. Reidenbach, K. Reim, A. Lindner, T. Oest, K. R. Schubert, Y. Tsipolitis, J. Stiewe, R. S. Orr, D. Reßing, T. Siegmund, Dave Britton, Mikhail Danilov, B. Boštjančič, S. Ball, D. B. MacFarlane, Peter Krieger, K. Strahl, D. Töpfer, Vladislav Balagura, Rainer Mankel, B. Fominykh, F. Sefkow, C. E. K. Charlesworth, R. Mundt, A. Krüger, R. G. Van de Water, R. Waldi, Robert K. Kutschke, H. I. Cronström, C. Geyer, C. Hast, Thomas Hamacher, E. Tzamariudaki, K. T. Knöpfle, V. Soloshenko, H. Thurn, U. Volland, H. Wegener, S. Weseler, R. Childers, A. Droutskoy, G. Herrera, P. Križan, A. Golutvin, S. Khan, A. Rostovtsev, T. Podobnik, A. Lange, Werner Hofmann, Holger Schulz, R. D. Appuhn, Manfred Paulini, D. Wegener, I. Tichomirov, H. Allrecht, A. Hölscher, T. Živko, K. W. Edwards, M. Schieber, H. Ehrlichmann, M. Schäfer, I. V. Gorelov, T. S. Yoon, A. Semenov, J. C. Gabriel, Stefan Schael, Sally Seidel, H. Kapitza, M. Hapke, Yu. Zaitsev, P. M. Patel, S. Werner, E. Križnič, J. Spengler, A. Nippe, G. Kernel, A. Walther, V. Shevchenko, and R. Wurth

Subjects
Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Order (ring theory), Elementary particle, Multiplicity (mathematics), Nuclear physics, High Energy Physics::Experiment, Production (computer science), Continuum (set theory), Engineering (miscellaneous)
Abstract

We have measured theR value in non-resonante+e− annihilation using the ARGUS detector at the storage ring DORIS II. At a centre-of-mass energy\(\sqrt s = 9.36\) GeV the ratio of the hadronic cross-section to the μ-pair cross section in lowest order QED has been determined to beR=3.46±0.03±0.13. In addition, we have measured the charged-particle multiplicities in non-resonant hadron production at\(\sqrt s = 10.47\) GeV just below theB\(\bar B\) threshold and in ϒ (4S) resonance decays. For the average charged-particle multiplicities in continuum events and ϒ(4S)→B\(\bar B\) decays we obtain cont=8.35±0.02±0.20 and ϒ(4s)=10.81±0.05±0.23.

Published
1992

23. 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

24. 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

25. 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

26. 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

27. 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

28. 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

29. 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

30. 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

31. 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

32. 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

33. 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

34. HELENA: A Beauty factory in Hamburg

Author

Albrecht, H., Bohm, G., Ehrlichmann, H., Michel, E., Kluge, Hannelies, Nowak, S., Reidenbach, M., Reinsch, W., Schroder, H., Schulz, H. D., Walter, M., Wurth, R., Balewski, K., Dwersteg, B., Febel, A., Gamp, A., Hemmie, G., Herb, S., Kohaupt, R. D., Rummler, J., Hartwig, H., Jacobs, G., Jensen, J. P., Kaiser, H., Kouptsidis, J., Kramer, D., Marx, M., Meyer, G., Musfeldt, H., Narciss, H., Oentrich, B., Patzold, S., Piwinski, A., Proch, D., Sekutowicz, J., Sinram, K., Wumpelmann, H., Willeke, F., Hermann Kolanoski, Mankel, R., Spaan, B., Wegener, D., Schmidt-Parzefall, W., Hanke, P., Stiewe, J., Ball, S., Geyer, C., Hofmann, W., Holzer, B., Jaeschke, E., Khan, S., Knopfle, K. T., Spahn, M., Spengler, J., Grosse-Wiesmann, P., Strahl, K., Cindro, V., Kernel, G., Korpar, S., Krizan, P., Kriznic, E., Stanovnik, A., Staric, M., Danilov, M., Droutskoy, A., Fominykh, B., Nepeipivo, A., Rostovtsev, A., Tikhomirov, I., Zaitsev, Yu, Kotthaus, R., Lorenz, E., Wormser, G., Kapitza, H., Chauveau, J., Aleksan, R., and Horisberger, R.

Subjects
Particle Physics

Catalog

Books, media, physical & digital resources
See catalog results