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1. A measurement of the electronic widths Γ ee of the ϒ(1S), ϒ(2S), and ϒ(4S) resonances, and of the total decay width Γ of the ϒ(4S)

Author

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

Subjects
Physics, Argus, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Resonance, Elementary particle, DESY, Electron, Nuclear physics, Radiative transfer, Atomic physics, Engineering (miscellaneous), computer, Storage ring, computer.programming_language
Abstract

The partial decay width into electrons, Γ ee , of the ϒ(1S) and ϒ(2S) resonances have been measured with the detector ARGUS at thee+e− storage ring DORISII of DESY. Applying the formula of Kuraev and Fadin for the radiative corrections we find: Γ ee (ϒ(1S))= (1.32±0.04±0.03) keV and Γ ee (ϒ(2S))=(0.52±0.03±0.01) keV. The total decay width of the ϒ(4S) resonance and its partial width into electrons have been determined as well. Fitting the data with a generalized Breit-Wigner function with an energy dependent decay width Γ(s) and a mass shift functionm(s), we obtain the following resonance parameters: Γ(M2)=(10.0±2.8±2.7) MeV, Γ ee =(0.28±0.05±0.01)keV andB ee =(2.77±0.50±0.49)·10−5. We argue that the disagrecment of this result with the world average originates from our more adequate parametrization of the observed ϒ(4S) resonance cross section.

Published
1995
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2. A search for the lepton-flavour violating decays τ → eα, τ → μα

Author

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

Subjects
Physics, Particle physics, Argus, Physics and Astronomy (miscellaneous), Physics::Instrumentation and Detectors, Electron–positron annihilation, High Energy Physics::Phenomenology, Flavour, DESY, Spectral line, Nuclear physics, High Energy Physics::Experiment, Engineering (miscellaneous), computer, Storage ring, Lepton, computer.programming_language
Abstract

Lepton spectra in τ decays have been studied with the ARGUS detector at thee+e− storage ring DORIS II at DESY using the “pseudo-rest-frame” technique. We have improved upper limits for two-body τ-decays into a lepton and an unobservable particle.

Published
1995
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3. Measurement of the decay fractions ofD * mesons

Author

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

Subjects
Physics, Argus, Nuclear magnetic resonance, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Analytical chemistry, Engineering (miscellaneous), computer, computer.programming_language
Abstract

Using the ARGUS detector at the DORIS II electron-positron storage ring at DESY, we have measured BR(D*+→D0π+)=(68.8±2.4±1.3)%, BR(D*+→D+π0)=(31.2±1.1±0.8)%, BR(D*+→D+γ)

Published
1995
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4. Study ofD 0 andD + decays into final states with two or three kaons

Author

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

Subjects
Physics, Argus, Particle physics, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Model prediction, Elementary particle, Nuclear physics, Field theory (psychology), Quantum field theory, Engineering (miscellaneous), computer, Storage ring, computer.programming_language
Abstract

Using the ARGUS detector at thee+e− storage ring DORIS II, we have studied Cabibbo-suppressedD0 decay modes resulting in theK+K−π+π− final state and two-bodyD0 decay modes with a ϕ meson in the final state. TheBR(D0→KS0KS0π+π− was measured for the first time. We also present a measurement of theD+→KS0KS0K+ branching ratio. The values are compared with other experimental results and model predictions.

Published
1994
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5. Kaons in flavour taggedB decays

Author

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

Subjects
Physics, Particle physics, Argus, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Flavour, Nuclear physics, Angular distribution, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), computer, Storage ring, Lepton, computer.programming_language
Abstract

Using the ARGUS detector at thee+e− storage ring DORIS II, flavour-dependent kaon production inB meson decays has been studied. Using the leptons as flavour tags, it has been possible to separately measure the multiplicities ofK+,K− andKs0 in inclusiveB decays and in semileptonicB decays. The kaon production in semileptonicB decays was further used to estimate the ratio of charmed decays over all decays, and thus also the fraction of charmlessB decays.

Published
1994
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6. 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
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7. 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
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8. Inclusive production of η′ (958) andf o (975) mesons in the υ energy region

Author

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

Subjects
Physics, Particle physics, Argus, Annihilation, Physics and Astronomy (miscellaneous), Meson, Octet, Electron–positron annihilation, Nuclear physics, Pseudoscalar, Vector meson, Singlet state, Engineering (miscellaneous), computer, computer.programming_language
Abstract

The inclusive production cross sections of η′ (958) andf o (975) mesons are measured ine + e − annihilation in the nonresonant continuum around $$\sqrt s = 10$$ GeV and in decays of the υ resonances using the ARGUS detector. For η′ (958) mesons, a production ratio of η′ (958)/ηdir=0.35±0.24, with ηdir=η−BR(η′→ηX)·η′, is determined in direct υ(1S) decays, which can be partially explained by the pseudoscalar singlet/octet mixing. Forf o (975) production, we obtain a production ratio off o (975)/p(770)°=0.17±0.030 in direct υ(1S) decays. In its production features, thef o (975) behaves like an ordinary meson, though aK $$\bar K$$ molecule nature cannot be excluded. The substantial production yield of thef o (975) meson demonstrates the important effect of feeddown from mesons beyond the basic multiples on pseudoscalar and vector meson production.

Published
1993
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9. Inclusive production of charged pions, kaons and protons in υ(4S) decays

Author

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

Subjects
Physics, Argus, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Nuclear Theory, Hadron, Particle identification, Momentum, Nuclear physics, Pion, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), computer, Storage ring, computer.programming_language
Abstract

Using the detector ARGUS at thee + e − storage ring DORIS II, we have investigated inclusive momentum spectra of charged pions, kaons, and protons from decays of the υ(4S) meson. The kaon spectra have been measured in two independent ways, by coherently exploiting the detector's particle identification capabilities, and by detecting decays in-flight. The extracted mean multiplicities for charged hadrons are 7.17±0.05±0.14 pions, 1.56±0.03±0.05 kaons and 0.110±0.010±0.007 protons per υ(4S) decay, where pions and protons fromK and Δ decays have been subtracted.

Published
1993
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10. Search for rareB meson decays intoD s + mesons

Author

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

Subjects
Quark, Physics, Argus, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Resonance, Coupling (probability), Nuclear physics, High Energy Physics::Experiment, B meson, Engineering (miscellaneous), computer, computer.programming_language
Abstract

A search has been performed for rareB meson decays intoD − mesons arising fromb→u transitions,W exchange modes,B + annihilation processes, and decays where theD + is not produced via aW→c $$\bar s$$ quark pair coupling, using the ARGUS detector operating on the Ψ(4S) resonance at thee + e − storage ring DORIS II. Upper limits for individual decay modes are obtained. In addition, from a study ofD + l- correlations an upper limit of BR (B→D + l- X) (90% CL) is determined.

Published
1993
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11. Analysis of the decayτ - →π - π - π + v τ and determination of thea 1(1260) resonance parameters

Author

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

Subjects
Physics, Argus, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, Hadron, Dalitz plot, Resonance, Elementary particle, Intermediate state, Atomic physics, Engineering (miscellaneous), computer, computer.programming_language
Abstract

Using the ARGUS detector at the DORIS IIe +e− storage ring we have studied the three-pion hadronic final state in the decay τ- → π-π-π+ v τ. From about 7500 events we conclude that the three-pion system is dominated by theJ P=1+ resonancea 1 (1260) decaying preferentially via ρ0π-. Our data restrict a possible ρπ contribution of three-pion states without intermediate resonances to less than 6% at 95% CL. Fitting a model by Isgur et al. to the data yields $$m_{a_1 } = (1.211 \pm 0.007 \pm _{0.0}^{0.050} ) GeV/c^2 $$ and $$\Gamma _{a_1 } = (0.446 \pm 0.0021 \pm _{0.0}^{0.140} ) GeV/c^2 $$ . The second errors reflect the model dependence of the result. This is the currently most significant determination of thea 1 resonance parameters. The ratio ofS- andD-wave amplitudes for the ρ0π- intermediate state of thea 1 − decay at the nominala 1 − mass was found to beD/S=−0.11±0.02. Using thisD/S ratio we update our former measurement of the parity violating asymmetry parameter $$\gamma _{AV} = 2g_A g_V /(g_A^2 + g_V^2 )$$ to 1.25±0.23± 0.08 0.15 . The branching ratio of the decay τ- → π-π-π+ v τ is determined to be Br(τ- → π-π-π+ v τ)=(6.8±0.1±0.5)%.

Published
1993
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12. Measurement of the decayτ − →ρ − ν τ

Author

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

Subjects
Physics, Particle physics, Argus, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, Coupling (probability), Pion, Tau neutrino, Invariant mass, Engineering (miscellaneous), computer, computer.programming_language, Spin-½
Abstract

An analysis of the decay τ-→π-π0vτ has been performed using the ARGUS detector at the DORIS II storage ring. The branching ratio has been determined to be Br(τ-→π-π0vτ=(22.6±0.4±0.9)%. The shape of the π-π0 invariant mass spectrum is found to be in good agreement with the predictions obtained using the conserved vector current (CVC) hypothesis, suggesting that the π-π0 system is produced in aJP=1− state. An analysis of the measured decay angular distribution of the pions with respect to the flight direction of the π-π0 system demonstrates the vector nature of the coupling at the τvτ vertex. With the assumption of zerovτ mass thevτ spin has been shown to be\(J_{v_\tau}= \tfrac{1}{2} \).

Published
1992
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13. 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
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14. New results onD 0 decays

Author

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

Subjects
Physics, Particle physics, Argus, Physics and Astronomy (miscellaneous), Meson, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Elementary particle, Engineering (miscellaneous), Omega, computer, computer.programming_language
Abstract

Using the ARGUS detector at thee+e− storage ring DORIS II, we have studied nine decay modes of theD0 meson. In addition to a higher-precision determination of the branching ratios for these modes, several new channels, the decays\(D^0 \to \bar K^0 \eta '\),\(D^0 \to \bar K^{*0} \omega \) and\(D^0 \to \bar K\pi ^ + \omega \), have been observed for the first time.

Published
1992
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15. Search for charm production in direct decays of the ϒ(1S) resonance

Author

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

Subjects
Physics, Argus, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Resonance, DESY, Nuclear physics, Charm (quantum number), Engineering (miscellaneous), computer, Storage ring, computer.programming_language, Lepton
Abstract

The production ofD*(2010)+ andJ/ψ mesons and prompt leptons has been investigated ine+e− interactions at the Ψ(1S) resonance energy. The data were collected at the storage ring DORIS II at DESY with the ARGUS detector. We obtain upper limits of BRdir (ϒ (1S)→D*(2010)±+X) 0.2) and BRdir (ϒ(1S)→J/ψ+X)

Published
1992
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16. Measurement of inclusive baryon production inB meson decays

Author

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

Subjects
Physics, Particle physics, Argus, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Nuclear Theory, High Energy Physics::Phenomenology, DESY, Astrophysics::Cosmology and Extragalactic Astrophysics, Nuclear physics, Baryon, High Energy Physics::Experiment, B meson, Nuclear Experiment, Engineering (miscellaneous), computer, Storage ring, Bar (unit), computer.programming_language
Abstract

Using the ARGUS detector at thee + e − storage ring DORIS II at DESY, we have studiedB meson decays into baryonsp and Λ. From the simultaneous analysis ofp and Λ yields,p $$\bar p$$ and Λ $$\bar p$$ correlations, and various lepton-baryon and lepton-baryon-antibaryon correlations the inclusive branching ratio is found to be BR (B→baryons)=(6.8±0.5±0.3)%.

Published
1992
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