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7 results on '"R.D. Appuhn"'

1. A measurement of asymmetry in the decay Λc+ → Λπ+

Author

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

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Argus, media_common.quotation_subject, Electron–positron annihilation, DESY, Parity (mathematics), Asymmetry, computer, Storage ring, media_common, computer.programming_language
Abstract

Using the ARGUS detector at the e + e − storage ring DORIS II at DESY, we have observed parity violation in the decay Λ ± c → Λπ ± . We measure the coefficient of parity violation, α Λ c , to be −0.96±0.42. In addition, we measure σ BR ( Λ + c → Λπ + and σ BR ( Λ + c → Σ 0 π + ) to be, respectively, (2.2±0.3±0.4) pb and (2.0±0.7±0.4) pb.

Published
1992

2. The H1 detector at HERA

Author

I. Abt, T. Ahmed, S. Aid, V. Andreev, B. Andrieu, R.D. Appuhn, C. Arnault, M. Arpagaus, A. Babaev, H. Bärwolff, J. Bán, E. Banas, P. Baranov, E. Barrelet, W. Bartel, M. Barth, U. Bassler, F. Basti, D.E. Baynham, J.-M. Baze, G.A. Beck, H.P. Beck, D. Bederede, H.-J. Behrend, C. Beigbeder, A. Belousov, Ch. Berger, H. Bergstein, R. Bernard, G. Bernardi, R. Bernet, R. Bernier, U. Berthon, G. Bertrand-Coremans, M. Besançon, R. Beyer, J.-C. Biasci, P. Biddulph, V. Bidoli, E. Binder, P. Binko, J.-C. Bizot, V. Blobel, F. Blouzon, H. Blume, K. Borras, V. Boudry, C. Bourdarios, F. Brasse, W. Braunschweig, D. Breton, H. Brettel, V. Brisson, D. Bruncko, C. Brune, U. Buchner, L. Büngener, J. Bürger, F.W. Büsser, A. Buniatian, S. Burke, P. Burmeister, A. Busata, G. Buschhorn, A.J. Campbell, T. Carli, F. Charles, M. Charlet, R. Chase, D. Clarke, A.B. Clegg, M. Colombo, V. Commichau, J.F. Connolly, U. Cornett, J.A. Coughlan, A. Courau, M.-C. Cousinou, Ch. Coutures, A. Coville, G. Cozzika, D.A. Cragg, L. Criegee, H.I. Cronström, N.H. Cunliffe, J. Cvach, A. Cyz, S. Dagoret, J.B. Dainton, M. Danilov, A.W.E. Dann, D. Darvill, W.D. Dau, J. David, M. David, R.J. Day, E. Deffur, B. Delcourt, L. Del Buono, F. Descamps, M. Devel, J.P. Dewulf, A. De Roeck, P. Dingus, K. Djidi, C. Dollfus, J.D. Dowell, H.B. Dreis, A. Drescher, U. Dretzler, J. Duboc, A. Ducorps, D. Düllmann, O. Dünger, H. Duhm, B. Dulny, F. Dupont, R. Ebbinghaus, M. Eberle, J. Ebert, T.R. Ebert, G. Eckerlin, B.W.H. Edwards, V. Efremenko, S. Egli, S. Eichenberger, R. Eichler, F. Eisele, E. Eisenhandler, N.N. Ellis, R.J. Ellison, E. Elsen, A. Epifantsev, M. Erdmann, W. Erdmann, G. Ernst, E. Evrard, G. Falley, L. Favart, A. Fedotov, D. Feeken, R. Felst, J. Feltesse, Z.Y. Feng, I.F. Fensome, J. Fent, J. Ferencei, F. Ferrarotto, K. Finke, K. Flamm, W. Flauger, M. Fleischer, M. Flieser, P.S. Flower, G. Flügge, A. Fomenko, B. Fominykh, M. Forbush, J. Formánek, J.M. Foster, G. Franke, E. Fretwurst, W. Fröchtenicht, P. Fuhrmann, E. Gabathuler, K. Gabathuler, K. Gadow, K. Gamerdinger, J. Garvey, J. Gayler, E. Gažo, A. Gellrich, M. Gennis, U. Gensch, H. Genzel, R. Gerhards, K. Geske, I. Giesgen, D. Gillespie, W. Glasgow, L. Godfrey, J. Godlewski, U. Goerlach, L. Goerlich, N. Gogitidze, M. Goldberg, A.M. Goodall, I. Gorelov, P. Goritchev, L. Gosset, C. Grab, H. Grässler, R. Grässler, T. Greenshaw, C. Gregory, H. Greif, M. Grewe, G. Grindhammer, A. Gruber, C. Gruber, S. Günther, J. Haack, M. Haguenauer, D. Haidt, L. Hajduk, D. Hammer, O. Hamon, M. Hampel, D. Handschuh, K. Hangarter, E.M. Hanlon, M. Hapke, U. Harder, J. Harjes, P. Hartz, P.E. Hatton, R. Haydar, W.J. Haynes, J. Heatherington, V. Hedberg, C.R. Hedgecock, G. Heinzelmann, R.C.W. Henderson, H. Henschel, R. Herma, I. Herynek, W. Hildesheim, P. Hill, D.L. Hill, C.D. Hilton, J. Hladký, K.C. Hoeger, R.B. Hopes, R. Horisberger, A. Hrisoho, J. Huber, Ph. Huet, H. Hufnagel, N. Huot, J.-F. Huppert, M. Ibbotson, D. Imbault, H. Itterbeck, M.-A. Jabiol, A. Jacholkowska, C. Jacobsson, M. Jaffré, T. Jansen, P. Jean, J. Jeanjean, L. Jönsson, K. Johannsen, D.P. Johnson, L. Johnson, P. Jovanovic, H. Jung, P.I.P. Kalmus, D. Kant, G. Kantel, S. Karstensen, S. Kasarian, R. Kaschowitz, P. Kasselmann, U. Kathage, H.H. Kaufmann, G. Kemmerling, I.R. Kenyon, S. Kermiche, C. Keuker, C. Kiesling, M. Klein, C. Kleinwort, G. Knies, W. Ko, T. Kobler, J. Koch, T. Köhler, J. Köhne, M. Kolander, H. Kolanoski, F. Kole, J. Koll, S.D. Kolya, B. Koppitz, V. Korbel, M. Korn, P. Kostka, S.K. Kotelnikov, M.W. Krasny, H. Krehbiel, F. Krivan, D. Krücker, U. Krüger, U. Krüner-Marquis, M. Kubantsev, J.P. Kubenka, T. Külper, H.-J. Küsel, H. Küster, M. Kuhlen, T. Kurča, J. Kurzhöfer, B. Kuznik, B. Laforge, F. Lamarche, R. Lander, M.P.J. Landon, W. Lange, R. Langkau, P. Lanius, J.-F. Laporte, L. Laptin, H. Laskus, A. Lebedev, M. Lemler, U. Lenhardt, A. Leuschner, C. Leverenz, S. Levonian, D. Lewin, Ch. Ley, A. Lindner, G. Lindström, F. Linsel, J. Lipinski, B. Liss, P. Loch, A.B. Lodge, H. Lohmander, G.C. Lopez, J.-P. Lottin, V. Lubimov, K. Ludwig, D. Lüers, N. Lugetski, B. Lundberg, K. Maeshima, N. Magnussen, E. Malinovski, S. Mani, P. Marage, J. Marks, R. Marshall, J. Martens, F. Martin, G. Martin, R. Martin, H.-U. Martyn, J. Martyniak, V. Masbender, S. Masson, A. Mavroidis, S.J. Maxfield, S.J. McMahon, A. Mehta, K. Meier, J. Meissner, D. Mercer, T. Merz, C.A. Meyer, H. Meyer, J. Meyer, S. Mikocki, J.L. Mills, V. Milone, J. Möck, E. Monnier, B. Montés, F. Moreau, J. Moreels, B. Morgan, J.V. Morris, J.M. Morton, K. Müller, P. Murín, S.A. Murray, V. Nagovizin, B. Naroska, Th. Naumann, P. Nayman, A. Nepeipivo, P. Newman, D. Newman-Coburn, D. Newton, D. Neyret, H.K. Nguyen, F. Niebergall, C. Niebuhr, R. Nisius, T. Novák, H. Nováková, G. Nowak, G.W. Noyes, M. Nyberg, H. Oberlack, U. Obrock, J.E. Olsson, J. Olszowska, S. Orenstein, F. Ould-Saada, P. Pailler, S. Palanque, E. Panaro, A. Panitch, J.-Y. Parey, C. Pascaud, G.D. Patel, A. Patoux, C. Paulot, U. Pein, E. Peppel, E. Perez, P. Perrodo, A. Perus, S. Peters, J.-P. Pharabod, H.T. Phillips, J.P. Phillips, Ch. Pichler, A. Pieuchot, W. Pimpl, D. Pitzl, A. Porrovecchio, S. Prell, R. Prosi, H. Quehl, G. Rädel, F. Raupach, K. Rauschnabel, A. Reboux, P. Reimer, G. Reinmuth, S. Reinshagen, P. Ribarics, V. Riech, J. Riedlberger, H. Riege, S. Riess, M. Rietz, S.M. Robertson, P. Robmann, P. Röpnack, R. Roosen, K. Rosenbauer, A. Rostovtsev, C. Royon, A. Rudge, K. Rüter, M. Rudowicz, M. Ruffer, S. Rusakov, V. Rusinov, K. Rybicki, J. Sacton, N. Sahlmann, E. Sanchez, D.P.C. Sankey, M. Savitski, P. Schacht, S. Schiek, N. Schirm, S. Schleif, P. Schleper, W. von Schlippe, C. Schmidt, D. Schmidt, G. Schmidt, W. Schmitz, H. Schmücker, V. Schröder, J. Schütt, E. Schuhmann, M. Schulz, A. Schwind, W. Scobel, U. Seehausen, F. Sefkow, R. Sell, M. Seman, A. Semenov, P. Shatalov, V. Shekelyan, I. Sheviakov, H. Shooshtari, L.N. Shtarkov, G. Siegmon, U. Siewert, Y. Sirois, A. Sirous, I.O. Skillicorn, P. Škvařil, P. Smirnov, J.R. Smith, L. Smolik, D. Sole, Y. Soloviev, J. Špalek, H. Spitzer, R. von Staa, J. Staeck, P. Staroba, J. Šťastný, M. Steenbock, P. Štefan, P. Steffen, R. Steinberg, H. Steiner, B. Stella, K. Stephens, J. Stier, J. Stiewe, U. Stösslein, J. Strachota, U. Straumann, A. Strowbridge, W. Struczinski, J.P. Sutton, Z. Szkutnik, G. Tappern, S. Tapprogge, R.E. Taylor, V. Tchernyshov, V. Tchudakov, C. Thiebaux, K. Thiele, G. Thompson, R.J. Thompson, I. Tichomirov, C. Trenkel, W. Tribanek, K. Tröger, P. Truöl, M. Turiot, J. Turnau, J. Tutas, L. Urban, M. Urban, A. Usik, Š. Valkár, A. Valkárová, C. Vallée, G. Van Beek, M. Vanderkelen, L. Van Lancker, P. Van Mechelen, A. Vartapetian, Y. Vazdik, M. Vecko, P. Verrecchia, R. Vick, G. Villet, E. Vogel, K. Wacker, M. Wagener, I.W. Walker, A. Walther, G. Weber, D. Wegener, A. Wegner, P. Weissbach, H.P. Wellisch, L. West, D. White, S. Willard, M. Winde, G.-G. Winter, Th. Wolff, L.A. Womersley, A.E. Wright, E. Wünsch, N. Wulff, B.E. Wyborn, T.P. Yiou, J. Žáček, D. Zarbock, P. Závada, C. Zeitnitz, Z. Zhang, H. Ziaeepour, M. Zimmer, W. Zimmermann, F. Zomer, K. Zuber, Laboratoire de Physique Nucléaire et de Hautes Énergies ( LPNHE ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Paris Diderot - Paris 7 ( UPD7 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de l'Accélérateur Linéaire ( LAL ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Centre de Physique des Particules de Marseille ( CPPM ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Aix Marseille Université ( AMU ), H1, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Calorimeter (particle physics), Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, HERA, 01 natural sciences, law.invention, Nuclear physics, Upgrade, Data acquisition, law, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics, Collider, Instrumentation, Storage ring
Abstract

General aspects of the H1 detector at the electron-proton storage ring HERA as well as technical descriptions of the magnet, luminosity system, trigger, slow-control, data acquisition and off-line data handling are given. The three major components of the detector, the tracking, calorimeter and muon detectors, will be described in a forthcoming article. The present paper describes the detector that was used from 1992 to the end of 1994. After this a major upgrade of some components was undertaken. Some performance figures from luminosity runs at HERA during 1993 and 1994 are given.

Published
1997

3. Transition radiation detectors for electron identification beyond 1 GeV/c

Author

A. Schlösser, K. Heinloth, E. Lange, R.D. Appuhn, and R. Oedingen

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Wire chamber, Pion, Photon, Transition radiation, Physics::Instrumentation and Detectors, DESY, Electron, Instrumentation, Particle identification, Particle detector
Abstract

Transition radiation detectors (TRDs) have been tested for the separation of electrons from pions in the momentum range between 1 and 6 GeV/c. Foams as well as fibres and foils served as radiator materials while two types of chambers, a longitudinal drift chamber (DC) and a multiwire proportional chamber (MWPC), both of 16 mm depth and dominantly filled with xenon, were used for detecting the transition radiation photons with a setup of four chambers. Analyzing the data we compared the methods of mean, truncated mean and of maximum likelihood of the total charge measurements and several methods of cluster analysis. As a result of the total charge measurements performed at test beams at CERN and DESY we obtained about 1% pion contamination at 90% electron efficiency for the polypropylene materials in the configuration of four modules with a total length of 40 cm. An improvement by a factor of about two for the electron/pion discrimination can be obtained in the case of a detailed analysis of the clusters.

Published
1988

4. Monte Carlo simulation of a transition radiation detector

Author

R.D. Appuhn, E. Lange, R. Oedingen, and E. Paul

Subjects
Physics, Nuclear physics, Hybrid Monte Carlo, Nuclear and High Energy Physics, Transition radiation detector, Spectrometer, Monte Carlo method, Dynamic Monte Carlo method, High Energy Physics::Experiment, Monte Carlo method in statistical physics, Context (language use), Instrumentation, Particle detector
Abstract

This paper employs Monte Carlo simulations of the performance of a transition radiation detector (TRD). The program has been written for the TRD in the ZEUS spectrometer, which separates electrons from hadrons in the momentum range between 1 and 30 GeV/ c . Both, total charge method and cluster counting method were simulated taking into account various experimental parameters. In particular, it was found that the cluster counting method relies on a quantitative understanding of the background originating from the production of δ-electrons by charged particles. The results of the Monte Carlo calculations are in agreement with experimental data obtained with prototypes within a systematic uncertainty of 20%. We applied our Monte Carlo program to studies in order to find an optimum layout for the TRD within available space in the ZEUS spectrometer. In this context, the performance of TRD layouts with different geometries and materials has been evaluated comprehensively. The geometry found by optimization promises an improvement on hadron suppression by a factor of about two for both methods compared with present results from test measurements. Applying algorithms for a detailed analysis of the energy and space distributions of the clusters in the TRD, hadrons in the momentum range from 1 to 30 GeV/ c can be suppressed to a level of less than 2%. This method of cluster analysing improves the suppression of hadrons by a factor of about two compared to the total charge method.

Published
1988

5. Measurement of D∗+ polarization in the decay B̄0 → D∗+ℓ−ν

Author

H. Albrecht, P. Böckmann, R. Gläser, G. Harder, A. Krüger, A. Nippe, M. Reidenbach, M. Schäfer, W. Schmidt-Parzefall, H. Schröder, H.D. Schulz, F. Sefkow, J. Spengler, R. Wurth, R.D. Appuhn, A. Drescher, C. Hast, G. Herrera, D. Kamp, H. Kolanoski, A. Lindner, R. Mankel, H. Scheck, G. Schweda, B. Spaan, A. Walther, D. Wegener, U. Volland, H. Wegener, W. Funk, J.C. Gabriel, J. Stiewe, S. Werner, C.E.K. Charlesworth, K.W. Edwards, W.R. Frisken, H. Kapitza, R. Kutschke, D.B. Macfarlane, K.W. McLean, A.W. Nilsson, R.S. Orr, J.A. Parsons, P.M. Patel, J.D. Prentice, S.C. Seidel, J.D. Swain, G. Tsipolitis, T.-S. Yoon, R. Ammar, S. Ball, D. Coppage, R. Davis, S. Kanekal, N. Kwak, T. Ruf, S. Schael, K.R. Schubert, K. Strahl, R. Waldi, B. Boštjančič, G. Kernel, P. Križan, E. Križnič, M. Pleško, H.I. Cronström, L. Jönsson, A. Babaev, M. Danilov, B. Fominykh, A. Golutvin, I. Gorelov, V. Lubimov, A. Rostovtsev, A. Semenov, S. Semenov, V. Shevchenko, V. Soloshenko, V. Tchistilin, I. Tichomirov, Yu. Zaitsev, R. Childers, C.W. Darden, and R.C. Fernholz

Subjects
lcsh:Physics, lcsh:QC1-999
Abstract

Using the ARGUS detector at the e+e− storage ring DORIS II, we have measured the average polarization of D∗+ mesons originating from exclusive decays B̄0 → D∗+ℓ−ν. By comparing the D∗+ decay angular distribution to a functional form 1 + α cos2≡, we determine α to be α=0.7±0.9. This value of α leads to a ratio of longitudinal to transverse decay with Γl/ΓT=0.85±0.45, which allows the determination, |Vcb|=0.052±0.011. The importance of the transverse helicity component is manifested in the q2 and lepton spectra,which are also presented.

Published
1989

6. Search for b→sγ in exclusive decays of B mesons

Author

H. Albrecht, R. Gläser, G. Harder, A. Krüger, A. Nippe, T. Oest, M. Reidenbach, M. Schäfer, W. Schmidt-Parzefall, H. Schröder, H.D. Schulz, F. Sefkow, R. Wurth, R.D. Appuhn, A. Drescher, C. Hast, G. Herrera, H. Kolanoski, A. Lange, A. Lindner, R. Mankel, H. Scheck, G. Schweda, B. Spaan, A. Walther, D. Wegener, M. Paulini, K. Reim, U. Volland, H. Wegener, W. Funk, J. Stiewe, S. Werner, S. Ball, J.C. Gabriel, C. Geyer, A. Hölscher, W. Hofmann, B. Holzer, S. Khan, J. Spengler, C.E.K. Charlesworth, K.W. Edwards, W.R. Frisken, H. Kapitza, P. Krieger, R. Kutschke, D.B. MacFarlane, K.W. McLean, R.S. Orr, J.A. Parsons, P.M. Patel, J.D. Prentice, S.C. Seidel, J.D. Swain, G. Tsipolitis, T.-S. Yoon, R. Davis, T. Ruf, S. Schael, K.R. Schubert, K. Strahl, R. Waldi, S. Weseler, B. Bos̆tjanc̆ic̆, G. Kernel, P. Kriz̆an, E. Kriz̆nic̆, M. Ples̆ko, H.I. Cronström, L. Jönsson, A.W. Nilsson, A. Babaev, M. Danilov, B. Fominykh, A. Golutvin, I. Gorelov, V. Lubimov, A. Rostovtsev, A. Semonov, S. Semenov, V. Shevchenko, V. Soloshenko, V. Tchistilin, I. Tichomirov, Yu. Zaitsev, R. Childers, and C.W. Darden

Subjects
Nuclear and High Energy Physics
Published
1989

7. Measurement of the decay B0→D−ℓ+ν

Author

H. Albrecht, R. Gläser, G. Harder, A. Krüger, A. Nippe, T. Oest, M. Reidenbach, M. Schäfer, W. Schmidt-Parzefall, H. Schröder, H.D. Schulz, F. Sefkow, R. Wurth, R.D. Appuhn, A. Drescher, C. Hast, G. Herrera, H. Kolanoski, A. Lange, A. Lindner, R. Mankel, H. Scheck, G. Schweda, B. Spaan, A. Walther, D. Wegener, M. Paulini, K. Reim, U. Volland, H. Wegener, W. Funk, J. Stiewe, S. Werner, S. Ball, J.C. Gabriel, C. Geyer, A. Hölscher, W. Hofmann, B. Holzer, S. Khan, J. Spengler, C.E.K. Charlesworth, K.W. Edwards, W.R. Frisken, H. Kapitza, P. Krieger, R. Kutschke, D.B. MacFarlane, K.W. McLean, R.S. Orr, J.A. Parsons, P.M. Patel, J.D. Prentice, S.C. Seidel, J.D. Swain, G. Tsipolitis, T.-S. Yoon, R. Davis, T. Ruf, S. Schael, K.R. Schubert, K. Strahl, R. Waldi, S. Weseler, B. Boštjančič, G. Kernel, P. Križan, E. Križnič, M. Pleško, H.I. Cronström, L. Jönsson, A.W. Nilsson, A. Babaev, M. Danilov, B. Fominykh, A. Golutvin, I. Gorelov, V. Lubimov, A. Rostovtsev, A. Semenov, S. Semenov, V. Shevchenko, V. Soloshenko, V. Tchistilin, I. Tichomirov, Yu. Zaitsev, R. Childers, and C.W. Darden

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Argus, Particle physics, Meson, Branching fraction, Electron–positron annihilation, computer, Storage ring, computer.programming_language
Abstract

Using the ARGUS detector at the e + e − storage ring DORIS II, we have investigated the decay B 0 →D − l + ν, where l + is e + or μ + . The B 0 mesons were produced in 150 000 ϒ(4S) decays. Assuming electron-muon universality we obtain a branching ratio BR(B 0 →D − e + ν )=BR(B 0 →D − μ + ν )=(1.8±0.6±0.5)%.

Published
1989

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