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1. Search for charged Higgs bosons in e+e− collisions at $\sqrt{s}=189\mbox{--}209\ \mbox{GeV}$

Author: The OPAL Collaboration, G. Abbiendi, C. Ainsley, P. F. Åkesson, G. Alexander, G. Anagnostou, K. J. Anderson, S. Asai, D. Axen, I. Bailey, E. Barberio, T. Barillari, R. J. Barlow, R. J. Batley, P. Bechtle, T. Behnke, K. W. Bell, P. J. Bell, G. Bella, A. Bellerive, G. Benelli, S. Bethke, O. Biebel, O. Boeriu, P. Bock, M. Boutemeur, S. Braibant, R. M. Brown, H. J. Burckhart, S. Campana, P. Capiluppi, R. K. Carnegie, A. A. Carter, J. R. Carter, C. Y. Chang, D. G. Charlton, C. Ciocca, A. Csilling, M. Cuffiani, S. Dado, M. Dallavalle, A. De Roeck, E. A. De Wolf, K. Desch, B. Dienes, J. Dubbert, E. Duchovni, G. Duckeck, I. P. Duerdoth, E. Etzion, F. Fabbri, P. Ferrari, F. Fiedler, I. Fleck, M. Ford, A. Frey, P. Gagnon, J. W. Gary, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, M. Giunta, J. Goldberg, E. Gross, J. Grunhaus, M. Gruwé, A. Gupta, C. Hajdu, M. Hamann, G. G. Hanson, A. Harel, M. Hauschild, C. M. Hawkes, R. Hawkings, G. Herten, R. D. Heuer, J. C. Hill, K. Hoffman, D. Horváth, P. Igo-Kemenes, K. Ishii, H. Jeremie, P. Jovanovic, T. R. Junk, J. Kanzaki, D. Karlen, K. Kawagoe, T. Kawamoto, R. K. Keeler, R. G. Kellogg, B. W. Kennedy, S. Kluth, T. Kobayashi, M. Kobel, S. Komamiya, T. Krämer, A. Krasznahorkay, P. Krieger, J. von Krogh, T. Kuhl, M. Kupper, G. D. Lafferty, H. Landsman, D. Lanske, D. Lellouch, J. Letts, L. Levinson, J. Lillich, S. L. Lloyd, F. K. Loebinger, J. Lu, A. Ludwig, J. Ludwig, W. Mader, S. Marcellini, T. E. Marchant, A. J. Martin, T. Mashimo, P. Mättig, J. McKenna, R. A. McPherson, F. Meijers, W. Menges, F. S. Merritt, H. Mes, N. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D. J. Miller, W. Mohr, T. Mori, A. Mutter, K. Nagai, I. Nakamura, H. Nanjo, H. A. Neal, S. W. O’Neale, A. Oh, A. Okpara, M. J. Oreglia, S. Orito, C. Pahl, G. Pásztor, J. R. Pater, J. E. Pilcher, J. Pinfold, D. E. Plane, O. Pooth, M. Przybycień, A. Quadt, K. Rabbertz, C. Rembser, P. Renkel, J. M. Roney, A. M. Rossi, Y. Rozen, K. Runge, K. Sachs, T. Saeki, E. K. G. Sarkisyan, A. D. Schaile, O. Schaile, P. Scharff-Hansen, J. Schieck, T. Schörner-Sadenius, M. Schröder, M. Schumacher, R. Seuster, T. G. Shears, B. C. Shen, P. Sherwood, A. Skuja, A. M. Smith, R. Sobie, S. Söldner-Rembold, F. Spano, A. Stahl, D. Strom, R. Ströhmer, S. Tarem, M. Tasevsky, R. Teuscher, M. A. Thomson, E. Torrence, D. Toya, I. Trigger, Z. Trócsányi, E. Tsur, M. F. Turner-Watson, I. Ueda, B. Ujvári, C. F. Vollmer, P. Vannerem, R. Vértesi, M. Verzocchi, H. Voss, J. Vossebeld, C. P. Ward, D. R. Ward, P. M. Watkins, A. T. Watson, N. K. Watson, P. S. Wells, T. Wengler, N. Wermes, G. W. Wilson, J. A. Wilson, G. Wolf, T. R. Wyatt, S. Yamashita, D. Zer-Zion, and L. Zivkovic
Subjects: Higgs Boson, Systematic Uncertainty, Test Mass, Charged Higgs Boson, Likelihood Selection, Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Abstract A search is made for charged Higgs bosons predicted by Two-Higgs-Doublet extensions of the Standard Model (2HDM) using electron-positron collision data collected by the OPAL experiment at $\sqrt{s}=189\mbox{--}209\ \mbox{GeV}$ , corresponding to an integrated luminosity of approximately 600 pb−1. Charged Higgs bosons are assumed to be pair-produced and to decay into $\mathrm{q} \bar{\mathrm{q}}$ , τν τ or AW±. No signal is observed. Model-independent limits on the charged Higgs-boson production cross section are derived by combining these results with previous searches at lower energies. Under the assumption $\mathrm{BR} (\mathrm{H}^{\pm} \to \tau\nu_{\tau}) + \mathrm{BR} (\mathrm{H}^{\pm} \to \mathrm{q} \bar{\mathrm{q}}) = 1$ , motivated by general 2HDM type II models, excluded areas on the $[m_{\mathrm{H}^{\pm}} , \mathrm{BR} (\mathrm {H}^{\pm} \to \tau\nu_{\tau})]$ plane are presented and charged Higgs bosons are excluded up to a mass of 76.3 GeV at 95 % confidence level, independent of the branching ratio BR(H±→τν τ). A scan of the 2HDM type I model parameter space is performed and limits on the Higgs-boson masses $m_{\mathrm{H}^{\pm}}$ and m A are presented for different choices of tanβ.
Published: 2012
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2. Angular analysis of the muon pair asymmetry at LEP 1

Author: G. Abbiendi, C. Ainsley, P.F. Åkesson, G. Alexander, J. Allison, G. Anagnostou, K.J. Anderson, S. Arcelli, S. Asai, D. Axen, G. Azuelos, I. Bailey, E. Barberio, R.J. Barlow, R.J. Batley, T. Behnke, K.W. Bell, P.J. Bell, G. Bella, A. Bellerive, S. Bethke, O. Biebel, I.J. Bloodworth, O. Boeriu, P. Bock, J. Böhme, D. Bonacorsi, M. Boutemeur, S. Braibant, L. Brigliadori, R.M. Brown, H.J. Burckhart, J. Cammin, R.K. Carnegie, B. Caron, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, P.E.L. Clarke, E. Clay, I. Cohen, J. Couchman, A. Csilling, M. Cuffiani, S. Dado, G.M. Dallavalle, S. Dallison, A. De Roeck, E.A. De Wolf, P. Dervan, K. Desch, B. Dienes, M.S. Dixit, M. Donkers, J. Dubbert, E. Duchovni, G. Duckeck, I.P. Duerdoth, E. Etzion, F. Fabbri, L. Feld, P. Ferrari, F. Fiedler, I. Fleck, M. Ford, A. Frey, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, D. Glenzinski, J. Goldberg, K. Graham, E. Gross, J. Grunhaus, M. Gruwé, P.O. Günther, A. Gupta, C. Hajdu, M. Hamann, G.G. Hanson, K. Harder, A. Harel, M. Harin-Dirac, M. Hauschild, J. Hauschildt, C.M. Hawkes, R. Hawkings, R.J. Hemingway, C. Hensel, G. Herten, R.D. Heuer, J.C. Hill, K. Hoffman, R.J. Homer, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, K. Ishii, A. Jawahery, H. Jeremie, C.R. Jones, P. Jovanovic, T.R. Junk, N. Kanaya, J. Kanzaki, G. Karapetian, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, D.H. Kim, K. Klein, A. Klier, S. Kluth, T. Kobayashi, M. Kobel, T.P. Kokott, S. Komamiya, R.V. Kowalewski, T. Krämer, T. Kress, P. Krieger, J. von Krogh, D. Krop, T. Kuhl, M. Kupper, P. Kyberd, G.D. Lafferty, H. Landsman, D. Lanske, I. Lawson, J.G. Layter, A. Leins, D. Lellouch, J. Letts, L. Levinson, J. Lillich, C. Littlewood, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Lu, J. Ludwig, A. Macchiolo, A. Macpherson, W. Mader, S. Marcellini, T.E. Marchant, A.J. Martin, J.P. Martin, G. Martinez, G. Masetti, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, T.J. McMahon, R.A. McPherson, F. Meijers, P. Mendez-Lorenzo, W. Menges, F.S. Merritt, H. Mes, A. Michelini, S. Mihara, G. Mikenberg, D.J. Miller, S. Moed, W. Mohr, T. Mori, A. Mutter, K. Nagai, I. Nakamura, H.A. Neal, R. Nisius, S.W. O'Neale, A. Oh, A. Okpara, M.J. Oreglia, S. Orito, C. Pahl, G. Pásztor, J.R. Pater, G.N. Patrick, J.E. Pilcher, J. Pinfold, D.E. Plane, B. Poli, J. Polok, O. Pooth, A. Quadt, K. Rabbertz, C. Rembser, P. Renkel, H. Rick, N. Rodning, J.M. Roney, S. Rosati, K. Roscoe, Y. Rozen, K. Runge, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, P. Scharff-Hansen, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, F. Spano, M. Sproston, A. Stahl, K. Stephens, D. Strom, R. Ströhmer, L. Stumpf, B. Surrow, S. Tarem, M. Tasevsky, R.J. Taylor, R. Teuscher, J. Thomas, M.A. Thomson, E. Torrence, D. Toya, T. Trefzger, A. Tricoli, I. Trigger, Z. Trócsányi, E. Tsur, M.F. Turner-Watson, I. Ueda, B. Ujvári, B. Vachon, C.F. Vollmer, P. Vannerem, M. Verzocchi, H. Voss, J. Vossebeld, D. Waller, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, T. Wengler, N. Wermes, D. Wetterling, G.W. Wilson, J.A. Wilson, T.R. Wyatt, S. Yamashita, V. Zacek, D. Zer-Zion, G., Abbiendi, C., Ainsley, P. F., Akesson, G., Alexander, J., Allison, G., Anagnostou, K. J., Anderson, S., Arcelli, S., Asai, D., Axen, G., Azuelo, I., Bailey, E., Barberio, R. J., Barlow, R. J., Batley, T., Behnke, K. W., Bell, P. J., Bell, G., Bella, A., Bellerive, S., Bethke, O., Biebel, I. J., Bloodworth, O., Boeriu, P., Bock, J., Bohme, D., Bonacorsi, M., Boutemeur, S., Braibant, L., Brigliador, R. M., Brown, H. J., Burckhart, J., Cammin, R. K., Carnegie, B., Caron, A. A., Carter, J. R., Carter, C. Y., Chang, D. G., Charlton, P. E., L., E., Clay, I., Cohen, J., Couchman, A., Csilling, M., Cuffiani, S., Dado, G. M., Dallavalle, S., Dallison, A., De Roeck, E. A., De, P., Dervan, K., Desch, B., Diene, M. S., Dixit, M., Donker, J., Dubbert, E., Duchovni, G., Duckeck, I. P., Duerdoth, E., Etzion, F., Fabbri, L., Feld, P., Ferrari, F., Fiedler, I., Fleck, M., Ford, A., Frey, A., Furtje, D. I., Futyan, P., Gagnon, J. W., Gary, G., Gaycken, C., Geich Gimbel, G., Giacomelli, P., Giacomelli, D., Glenzinski, J., Goldberg, K., Graham, E., Gro, J., Grunhau, M., Gruwe, P. O., Gunther, A., Gupta, C., Hajdu, M., Hamann, G. G., Hanson, K., Harder, A., Harel, M., Harin Dirac, M., Hauschild, J., Hauschildt, C. M., Hawke, R., Hawking, R. J., Hemingway, C., Hensel, G., Herten, R. D., Heuer, J. C., Hill, K., Hoffman, R. J., Homer, D., Horvath, K. R., Hossain, R., Howard, P., Huntemeyer, P., Igo Kemene, K., Ishii, A., Jawahery, H., Jeremie, C. R., Jone, P., Jovanovic, T. R., Junk, N., Kanaya, J., Kanzaki, G., Karapetian, D., Karlen, V., Kartvelishvili, K., Kawagoe, T., Kawamoto, R. K., Keeler, R. G., Kellogg, B. W., Kennedy, D. H., Kim, K., Klein, A., Klier, S., Kluth, T., Kobayashi, M., Kobel, T. P., Kokott, S., Komamiya, R. V., Kowalewski, T., Kramer, T., Kre, P., Krieger, J., van Krogh, D., Krop, T., Kuhl, M., Kupper, P., Kyberd, G. D., Lafferty, H., Landsman, D., Lanske, I., Lawson, J. G., Layter, A., Lein, D., Lellouch, J., Lett, L., Levinson, J., Lillich, C., Littlewood, S. L., Lloyd, F. K., Loebinger, G. D., Long, M. J., Losty, J., Lu, J., Ludwig, A., Macchiolo, A., Macpherson, W., Mader, S., Marcellini, T. E., Marchant, A. J., Martin, J. P., Martin, G., Martinez, G., Masetti, T., Mashimo, P., Mattig, W. J., Mcdonald, J., Mckenna, T. J., Mcmahon, R. A., Mcpherson, F., Meijer, P., Mendez Lorenzo, W., Menge, F. S., Merritt, H., Me, A., Michelini, S., Mihara, G., Mikenberg, D. J., Miller, S., Moed, W., Mohr, T., Mori, A., Mutter, K., Nagai, I., Nakamura, H. A., Neal, R., Nisiu, S. W., O'Neale, A., Oh, A., Okpara, M. J., Oreglia, S., Orito, C., Pahl, G., Pasztor, J. R., Pater, G. N., Patrick, J. E., Pilcher, J., Pinfold, D. E., Plane, B., Poli, J., Polok, O., Pooth, A., Quadt, K., Rabbertz, C., Rembser, P., Renkel, H., Rick, N., Rodning, J. M., Roney, S., Rosati, K., Roscoe, Y., Rozen, K., Runge, D. R., Rust, K., Sach, T., Saeki, O., Sahr, E. K., G., C., Sbarra, A. D., Schaile, O., Schaile, P., Scharff Hansen, M., Schroder, M., Schumacher, C., Schwick, W. G., Scott, R., Seuster, T. G., Shear, B. C., Shen, C. H., Shepherd Themistocleou, P., Sherwood, A., Skuja, A. M., Smith, G. A., Snow, R., Sobie, S., Soldner Rembold, Spagnolo, Stefania Antonia, F., Spano, M., Sproston, A., Stahl, K., Stephen, D., Strom, R., Strohmer, L., Stumpf, B., Surrow, S., Tarem, M., Tasevsky, R. J., Taylor, R., Teuscher, J., Thoma, M. A., Thomson, E., Torrence, D., Toya, T., Trefzger, A., Tricoli, I., Trigger, Z., Trocsanyi, E., Tsur, M. F., Turner Watson, I., Ueda, B., Ujvari, B., Vachon, C. F., Vollmer, P., Vannerem, M., Verzocchi, H., Vo, J., Vossebeld, D., Waller, C. P., Ward, D. R., Ward, P. M., Watkin, A. T., Watson, N. K., Watson, P. S., Well, T., Wengler, N., Werme, D., Wetterling, G. W., Wilson, J. A., Wilson, T. R., Wyatt, S., Yamashita, V., Zacek, D., Zer Zion, and OPAL Collaboration
Subjects: Physics, Particle physics, Nuclear and High Energy Physics, Muon, 010308 nuclear & particles physics, media_common.quotation_subject, Photon radiation, FOS: Physical sciences, Radiation, Interference (wave propagation), 01 natural sciences, Asymmetry, Standard Model, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Pair production, 0103 physical sciences, Invariant mass, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment, media_common
Abstract: Data on muon pair production obtained by the OPAL collaboration at centre of mass energies near the Z peak are analysed. Small angular mismatches between the directions of the two muons are used to assess the effects of initial state photon radiation and initial-final-state radiation interference on the forward-backward asymmetry of muon pairs. The dependence of the asymmetry on the invariant mass of the pair is measured in a model-independent way. Effective vector and axial-vector couplings of the Z boson are determined and compared to the Standard Model expectations., 31 pages, 8 figures, Accepted by Physics Letters B
Published: 2001
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3. Search for invisibly decaying Higgs bosons in e+e−→Z0h0 production at s=183–209 GeV

Author: A. J. Martin, M. Ford, M. Boutemeur, F. S. Merritt, D. E. Plane, P. Scharff-Hansen, J. von Krogh, W. Mader, R. J. Hawkings, A. Harel, Ikuo Ueda, D. M. Strom, J. Lu, Ehud Duchovni, A. M. Smith, J. A. McKenna, Kiyotomo Kawagoe, Daniel Lellouch, Tara Shears, A. Michelini, J. Dubbert, Robert Vertesi, R. K. Carnegie, J. A. Wilson, Takehiko Mori, M. Schumacher, Gideon Bella, Andris Skuja, Robert McPherson, T. Kobayashi, M. Przybycień, A. Ludwig, A. D. Schaile, Gabriella Pasztor, D. Axen, A. A. Carter, Richard Teuscher, Oana Elena Vickey Boeriu, M. Verzocchi, P. F. Åkesson, Giovanni Abbiendi, P. J. Bell, H. J. Burckhart, R. M. Brown, T. R. Junk, Tetsuro Mashimo, M. F. Turner-Watson, P. Vannerem, Fabrizio Fabbri, A. Frey, E. A. De Wolf, F. Spano, P. S. Wells, Lorne Levinson, Peter Sherwood, Terry Richard Wyatt, A. T. Watson, J. Lillich, Matthias Schröder, B. W. Kennedy, C. P. Ward, G. W. Wilson, I. R. Bailey, P. Jovanovic, Christoph Geich-Gimbel, J. Ludwig, M. Hauschild, M. Hamann, N. Meyer, Klaus Rabbertz, L. Zivkovic, K. Runge, P. Bock, Peter Krieger, J. M. Roney, S. Söldner-Rembold, S. W. O'Neale, W. Menges, Otmar Biebel, M. Kupper, H. Nanjo, R. J. Sobie, Stephen Lloyd, Joost Vossebeld, Oliver Pooth, Klaus Desch, T. Schörner-Sadenius, Koichi Nagai, C. F. Vollmer, Attila Krasznahorkay, E. Torrence, A. Gupta, Yoram Rozen, W. Mohr, H. Mes, I. P. Duerdoth, Shlomo Dado, Jochen Schieck, K. J. Anderson, Thorsten Wengler, T. Behnke, D. J. Miller, G. Mikenberg, Norbert Wermes, Junichi Kanzaki, James Pinfold, A. Quadt, R. Seuster, M. A. Thomson, Marco Cuffiani, Gideon Alexander, Paolo Capiluppi, T. Kawamoto, E. K. U. Gross, R. J. Batley, Dave Charlton, H. Voss, R. J. Barlow, S. Orito, H. Landsman, C. Y. Chang, Teresa Barillari, Satoru Yamashita, Gabriele Benelli, P. Gagnon, A. Csilling, R. D. Heuer, M. J. Oreglia, E. L. Barberio, S. Braibant, E. Tsur, C. M. Hawkes, Zoltan Laszlo Trocsanyi, Isabel Marian Trigger, K. W. Bell, P. Mättig, Shoji Asai, Gregor Herten, J. C. Hill, Balazs Ujvari, Tobias Kramer, J. E. Pilcher, B. C. Shen, Siegfried Bethke, I. Nakamura, J. W. Gary, Raimund Ströhmer, Marek Tasevsky, Dezso Horvath, R. G. Kellogg, Beatrix Dienes, Alexander Oh, D. Lanske, Csaba Hajdu, J. Goldberg, Stefano Marcellini, Christoph Rembser, Gunter Wolf, James Letts, D. Karlen, D. Zer-Zion, F. K. Loebinger, Erez Etzion, Ivor Fleck, Stefan Kluth, Shlomit Tarem, Joleen Pater, M. Giunta, Edward K. G. Sarkisyan, D. Toya, H. A. Neal, Sachio Komamiya, M. Gruwe, T. Saeki, A. Mutter, J. Grunhaus, Gordon H. Hanson, G. Giacomelli, A. De Roeck, M. Kobel, Frans Meijers, Alain Bellerive, P. Igo-Kemenes, K. Ishii, H. Jeremie, G. Anagnostou, O. Schaile, T. Kuhl, Pamela Ferrari, Paolo Giacomelli, Claudia Ciocca, K. Sachs, J. R. Carter, Philip Bechtle, N. K. Watson, Achim Stahl, C. Ainsley, C. Pahl, A. M. Rossi, G. D. Lafferty, R. K. Keeler, P. M. Watkins, P. Renkel, S. Campana, Guenter Duckeck, Satoshi Mihara, Frank Fiedler, and D. R. Ward
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Elementary particle, 01 natural sciences, Standard Model, Vector boson, Nuclear physics, 0103 physical sciences, Neutralino, Higgs boson, High Energy Physics::Experiment, 010306 general physics, Minimal Supersymmetric Standard Model, Boson
Abstract: A search is performed for Higgs bosons decaying into invisible final states, produced in association with a Z(0) boson in e(+)e(-) collisions at energies between 183 and 209 GeV. The search is based on data samples collected by the OPAL detector at LEP corresponding to an integrated luminosity of about 660 pb(-1). The analysis aims to select events containing the hadronic decay products of the Z(0) boson and large missing momentum, as expected from Higgs boson decay into a pair of stable weakly interacting neutral particles, such as the lightest neutralino in the Minimal Supersymmetric Standard Model. The same analysis is applied to a search for nearly invisible Higgs boson cascade decays into stable weakly interacting neutral particles. No excess over the expected background from Standard Model processes is observed. Limits on the production of invisibly decaying Higgs bosons produced in association with a Z(0) boson are derived. Assuming a branching ratio BR(h(0) -> invisible) = 1, a lower limit of 108.2 GeV is placed on the Higgs boson mass at the 95% confidence level. Limits on the production of nearly invisibly decaying Higgs bosons are also obtained. (C) 2009 Elsevier B.V. All rights reserved.
Published: 2010

4. Search for antihelium: Progress with BESS

Author: A. A. Moiseev, Thomas Hams, K. Abe, J. Nishimura, K. C. Kim, Hideyuki Fuke, Eun-Suk Seo, Sadakazu Haino, R. E. Streitmatter, Akira Yamamoto, M. Sasaki, Jonathan F. Ormes, T. Yoshida, John Mitchell, Takamasa Yamagami, S. Orito, Shinya Matsuda, Kazuhiro Tanaka, Mitsuaki Nozaki, M. H. Lee, T. Sanuki, Jun-ichi Suzuki, Y. Shikaze, Koji Yoshimura, and Yasuhiro Makida
Subjects: Physics, Atmospheric Science, Flight duration, Geophysics, Rigidity (electromagnetism), Space and Planetary Science, Antimatter, Aerospace Engineering, General Earth and Planetary Sciences, Astronomy and Astrophysics, Cosmic ray, Astrophysics
Abstract: 著者人数: 25名, 資料番号: SA1000090000
Published: 2008

5. Search for primordial antiparticles with BESS

Author: Akira Yamamoto, Thomas Hams, Kazuhiro Tanaka, R. Shinoda, M. Sasaki, Koji Yoshimura, Sadakazu Haino, R. E. Streitmatter, Y. Shikaze, J. Nishimura, N. Thakur, Jun-ichi Suzuki, Y. Matsukawa, A. A. Moiseev, Tetsuya Yoshida, Mitsuaki Nozaki, S. Orito, K. Abe, Yasuhiro Makida, Shinya Matsuda, A. Kusumoto, Jonathan F. Ormes, A. Horikoshi, Hideyuki Fuke, Takamasa Yamagami, Masaya Hasegawa, M. H. Lee, T. Sanuki, K. C. Kim, Eun-Suk Seo, Kenichi Sakai, Reiko Orito, and John Mitchell
Subjects: Physics, Atmospheric Science, Range (particle radiation), Antiparticle, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Astrophysics::Instrumentation and Methods for Astrophysics, Aerospace Engineering, Astronomy, Astronomy and Astrophysics, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, Geophysics, Space and Planetary Science, Antiproton, General Earth and Planetary Sciences, Superconducting spectrometer, Nuclear Experiment, Short duration
Abstract: 著者人数: 33名, 資料番号: SA1000088000
Published: 2008

6. Search for Dirac magnetic monopoles in e+e− collisions with the OPAL detector at LEP2

Author: M. Ford, P. Igo-Kemenes, W. Menges, Otmar Biebel, Achim Stahl, J. von Krogh, K. Ishii, H. Jeremie, Kiyotomo Kawagoe, Yoram Rozen, David J. Miller, M. Boutemeur, F. S. Merritt, S. Campana, Sachio Komamiya, R. J. Hawkings, B. C. Shen, H. Landsman, M. Gruwe, O. Schaile, Norbert Wermes, J. A. McKenna, T. Kawamoto, Oliver Pooth, D. Zer-Zion, F. K. Loebinger, Junichi Kanzaki, Ivor Fleck, Joleen Pater, Edward K. G. Sarkisyan, D. Toya, H. A. Neal, Andris Skuja, R. G. Kellogg, Csaba Hajdu, Stefano Marcellini, T. Kuhl, Siegfried Bethke, Alain Bellerive, S. W. O'Neale, Gordon H. Hanson, Gideon Bella, S. Orito, Daniel Lellouch, H. Mes, E. L. Barberio, Paolo Giacomelli, Takehiko Mori, T. Saeki, H. J. Burckhart, Christoph Geich-Gimbel, I. Nakamura, I. P. Duerdoth, Gideon Alexander, A. D. Schaile, D. Axen, J. Dubbert, Robert Vertesi, R. K. Carnegie, A. J. Martin, Paolo Capiluppi, Tetsuro Mashimo, M. F. Turner-Watson, J. W. Gary, Oana Elena Vickey Boeriu, Gabriella Pasztor, P. Vannerem, J. A. Wilson, A. Krasznahorkay, F. Spano, G. Mikenberg, Guenter Duckeck, K. J. Anderson, Peter Sherwood, Lorne Levinson, D. R. Ward, Thorsten Wengler, Raimund Ströhmer, J. Lillich, Richard Teuscher, N. Meyer, P. Mättig, Teresa Barillari, B. W. Kennedy, I. R. Bailey, Marek Tasevsky, A. Csilling, M. J. Oreglia, J. Letts, J. Ludwig, K. Runge, P. Jovanovic, R. J. Batley, M. Kupper, P. Bock, T. R. Wyatt, S. Braibant, C. P. Ward, N. K. Watson, C. Pahl, Dezso Horvath, J. Grunhaus, Gunter Wolf, Peter Krieger, D. E. Plane, Shoji Asai, W. Mader, M. Schumacher, S. Söldner-Rembold, M. Przybycień, Klaus Rabbertz, T. R. Junk, A. A. Carter, G. M. Dallavalle, D. Karlen, J. M. Roney, E. A. De Wolf, Stephen Lloyd, C. Ainsley, P. S. Wells, Tara Shears, M. Verzocchi, G. Giacomelli, A. M. Rossi, P. F. Åkesson, Giovanni Abbiendi, A. T. Watson, P. Scharff-Hansen, L. Zivkovic, Dave Charlton, P. Gagnon, A. De Roeck, M. Kobel, Gabriele Benelli, Koichi Nagai, Shlomo Dado, W. Mohr, A. Mutter, Ehud Duchovni, Robert McPherson, R. M. Brown, P. M. Watkins, Zoltan Laszlo Trocsanyi, Frans Meijers, A. Harel, Fabrizio Fabbri, A. Frey, George Lafferty, A. M. Smith, Satoshi Mihara, A. Michelini, Ikuo Ueda, D. M. Strom, E. Torrence, A. Gupta, P. Renkel, R. D. Heuer, T. Kobayashi, J. Lu, M. Cozzi, Gregor Herten, A. Ludwig, John Hill, James Pinfold, A. Quadt, R. Seuster, Claudia Ciocca, Beatrix Dienes, K. Sachs, J. R. Carter, J. Goldberg, Philip Bechtle, Frank Fiedler, M. Hamann, G. Anagnostou, Balazs Ujvari, J. E. Pilcher, Richard Keeler, Pamela Ferrari, G. W. Wilson, R. J. Sobie, M. Hauschild, C. Y. Chang, Joost Vossebeld, M. A. Thomson, E. K. U. Gross, H. Voss, Klaus Desch, Satoru Yamashita, Matthias Schröder, E. Tsur, C. M. Hawkes, Christoph Rembser, T. Behnke, Isabel Marian Trigger, K. W. Bell, Erez Etzion, T. Schörner-Sadenius, Stefan Kluth, Shlomit Tarem, Tobias Kramer, M. Giunta, P. J. Bell, M. Cuffiani, H. Nanjo, C. F. Vollmer, Jochen Schieck, R. J. Barlow, Alexander Oh, and D. Lanske
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), 010308 nuclear & particles physics, Dirac (video compression format), Electron–positron annihilation, Magnetic monopole, Tracking (particle physics), 01 natural sciences, Charged particle, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Ionization energy, 010306 general physics, Event generator
Abstract: This Letter describes a direct search for pair produced magnetic monopoles in e(+)e(-) collisions. The analysis is based on 62.7 pb(-1) of data collected with the OPAL detector at an average centre-of-mass energy of root S = 206.3 GeV. The monopole signal was assumed to be characterized by two back-to-back particles with an anomalously high ionization energy loss dE/dx in the tracking chambers. No evidence for production of monopoles was observed. Upper limits were obtained on the magnetic monopole pair-production cross-section (sigma) in the mass range 45 GeV/c(2) < m(M) < 102 GeV/c(2). The average limit is sigma < 0.05 pb and is essentially independent of the magnetic monopole mass. The cross-section limit is derived at the 95% confidence level and is valid for spin-1/2 magnetic monopoles. (C) 2008 Published by Elsevier B.V.
Published: 2008

7. Inclusive jet production in photon–photon collisions at see from 189 to 209 GeV

Author: George Lafferty, Erez Etzion, Satoshi Mihara, Thorsten Wengler, Stefan Kluth, Shlomit Tarem, Klaus Rabbertz, Frank Fiedler, Dave Charlton, M. Ford, Stephen Lloyd, A. Harel, J. Lillich, Kiyotomo Kawagoe, Ikuo Ueda, D. M. Strom, S. Campana, B. W. Kennedy, M. Giunta, P. Jovanovic, C. Y. Chang, J. Lu, Peter Krieger, D. R. Ward, J. von Krogh, M. Schumacher, P. J. Bell, Shlomo Dado, Ehud Duchovni, D. Zer-Zion, D. E. Plane, Christoph Geich-Gimbel, R. D. Heuer, Gabriele Benelli, F. K. Loebinger, A. Michelini, P. Scharff-Hansen, R. J. Hawkings, T. Schörner-Sadenius, E. A. De Wolf, Gideon Bella, Ivor Fleck, E. Tsur, Gunter Wolf, Joleen Pater, Sachio Komamiya, C. M. Hawkes, H. J. Burckhart, Edward K. G. Sarkisyan, D. Toya, T. Kobayashi, A. Ludwig, Isabel Marian Trigger, K. W. Bell, D. Karlen, H. A. Neal, L. Zivkovic, Pamela Ferrari, H. Nanjo, A. M. Smith, D. J. Miller, A. D. Schaile, Gabriella Pasztor, P. Igo-Kemenes, M. Przybycień, P. Vannerem, J. C. Hill, Tara Shears, Gregor Herten, Richard Teuscher, Tobias Kramer, B. C. Shen, T. R. Junk, A. A. Carter, K. Ishii, H. Jeremie, C. P. Ward, M. Gruwe, Andris Skuja, S. W. O'Neale, E. Torrence, A. Gupta, Siegfried Bethke, H. Mes, P. S. Wells, A. Csilling, S. Söldner-Rembold, Oliver Pooth, C. F. Vollmer, M. Boutemeur, F. S. Merritt, Jochen Schieck, J. M. Roney, Gideon Alexander, Tetsuro Mashimo, M. F. Turner-Watson, Balazs Ujvari, J. Goldberg, J. E. Pilcher, R. K. Keeler, N. K. Watson, Koichi Nagai, H. Landsman, T. R. Wyatt, I. P. Duerdoth, K. J. Anderson, A. T. Watson, M. Verzocchi, P. F. Åkesson, Giovanni Abbiendi, I. Nakamura, J. W. Gary, W. Mohr, O. Schaile, N. Meyer, R. J. Barlow, Paolo Capiluppi, Paolo Giacomelli, M. Kupper, M. Hamann, Raimund Ströhmer, G. Mikenberg, G. W. Wilson, M. Hauschild, T. Behnke, P. Mättig, Marek Tasevsky, P. M. Watkins, T. Kuhl, E. L. Barberio, J. A. McKenna, Dezso Horvath, M. A. Thomson, J. Dubbert, Robert Vertesi, R. K. Carnegie, Robert McPherson, R. M. Brown, Lorne Levinson, Christoph Rembser, E. K. U. Gross, H. Voss, Daniel Lellouch, Marco Cuffiani, Takehiko Mori, P. Renkel, R. J. Batley, R. J. Sobie, J. A. Wilson, I. R. Bailey, R. G. Kellogg, Satoru Yamashita, James Pinfold, Joost Vossebeld, A. Quadt, R. Seuster, C. Ainsley, Fabrizio Fabbri, Klaus Desch, A. Frey, Guenter Duckeck, A. M. Rossi, A. J. Martin, Csaba Hajdu, Stefano Marcellini, Alain Bellerive, A. Krasznahorkay, W. Mader, J. Letts, C. Pahl, T. Saeki, Alexander Oh, G. Anagnostou, D. Lanske, Gordon H. Hanson, Claudia Ciocca, Achim Stahl, K. Sachs, J. R. Carter, Philip Bechtle, G. Giacomelli, A. Mutter, A. De Roeck, M. Kobel, Frans Meijers, Yoram Rozen, J. Grunhaus, Junichi Kanzaki, Teresa Barillari, B. Dienes, Shoji Asai, D. Axen, Oana Elena Vickey Boeriu, F. Spano, Peter Sherwood, J. Ludwig, K. Runge, P. Bock, P. Gagnon, Zoltan Laszlo Trocsanyi, W. Menges, Otmar Biebel, Norbert Wermes, T. Kawamoto, S. Orito, M. J. Oreglia, S. Braibant, and Matthias Schröder
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Jet (fluid), Photon, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Perturbative QCD, 01 natural sciences, Nuclear physics, Pair production, 0103 physical sciences, Strong coupling, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Event generator
Abstract: Inclusive jet production (e(+)e(-) -> e(+)e(-) + jet + X) is studied in collisions of quasi-real photons radiated by the LEP beams at e(+)e(-) centre-of-mass energies root s(ee) from 189 to 209 GeV. Jets are reconstructed using the k(perpendicular to) jet algorithm. The inclusive differential cross-section is measured as a function of the jet transverse momentum, p(T)(jet), in the range 5 < p(T)(jet) < 40 GeV for pseudo-rapidities, eta(jet), in the range - 1.5 < eta(jet) < 1.5. The results are compared to predictions of perturbative QCD in next-to-leading order in the strong coupling constant. (c) 2007 Elsevier B.V. All rights reserved.
Published: 2008

8. Search for fractionally charged particles in cosmic rays with the BESS spectrometer

Author: Jun-ichi Suzuki, Sadakazu Haino, Kazuhiro Tanaka, Tetsuya Yoshida, Y. Shikaze, Shinya Matsuda, Yasuhiro Makida, M. Sasaki, A. A. Moiseev, John Mitchell, R. E. Streitmatter, Takamasa Yamagami, Jonathan F. Ormes, S. Orito, Y. Tasaki, K. Abe, Mitsuaki Nozaki, Hideyuki Fuke, Koji Yoshimura, Akira Yamamoto, J. Nishimura, and Eun-Suk Seo
Subjects: Physics, Atmospheric Science, Spectrometer, Aerospace Engineering, Flux, Astronomy and Astrophysics, Cosmic ray, Scintillator, Charged particle, Atmosphere, Nuclear physics, Geophysics, Deposition (aerosol physics), Space and Planetary Science, General Earth and Planetary Sciences, Superconducting spectrometer
Abstract: 著者人数: 22名, 資料番号: SA1000087000
Published: 2008

9. Measurements of 0.2-20GeV/n cosmic-ray proton and helium spectra from 1997 through 2002 with the BESS spectrometer

Author: R. E. Streitmatter, Yasuhiro Makida, S. Matsuda, A. A. Moiseev, T. Yoshida, J. Suzuki, Y. Shikaze, Thomas Hams, Kazuhiro Tanaka, S. Orito, H. Fuke, K. Abe, M. Sasaki, Takamasa Yamagami, John Mitchell, Sadakazu Haino, Jonathan F. Ormes, Kohei Yoshimura, J. Nishimura, T. Sanuki, Akira Yamamoto, Mitsuaki Nozaki, K. C. Kim, and Eun-Suk Seo
Subjects: Physics, Range (particle radiation), Proton, Spectrometer, Astrophysics (astro-ph), FOS: Physical sciences, chemistry.chemical_element, Astronomy and Astrophysics, Cosmic ray, Astrophysics, Kinetic energy, 7. Clean energy, 01 natural sciences, Spectral line, Nuclear physics, Atmosphere, chemistry, 13. Climate action, 0103 physical sciences, Nuclear Experiment, 010306 general physics, 010303 astronomy & astrophysics, Helium
Abstract: We measured low energy cosmic-ray proton and helium spectra in the kinetic energy range 0.215 - 21.5 GeV/n at different solar activities during a period from 1997 to 2002. The observations were carried out with the BESS spectrometer launched on a balloon at Lynn Lake, Canada. A calculation for the correction of secondary particle backgrounds from the overlying atmosphere was improved by using the measured spectra at small atmospheric depths ranging from 5 through 37 g/cm^2. The uncertainties including statistical and systematic errors of the obtained spectra at the top of atmosphere are 5-7 % for protons and 6-9 % for helium nuclei in the energy range 0.5 - 5 GeV/n., Comment: 27 pages, 7 Tables, 9 figures, Submitted to Astroparticle Physics
Published: 2007

10. Erratum to: 'Measurements of proton, helium and muon spectra at small atmospheric depths with the BESS spectrometer' [Phys. Lett. B 564 (2003) 8]

Author: Yoichi Asaoka, Yasuhiro Makida, Y. Shikaze, Jun-ichi Suzuki, A. A. Moiseev, Yoshihisa Yamamoto, N. Ikeda, John Mitchell, Kazuhiro Tanaka, T. Sonoda, S. Matsuda, Mitsuaki Nozaki, T. Matsukawa, Eun-Suk Seo, Kohei Yoshimura, K. Abe, S. Orito, J. Nishimura, T. Sanuki, M. Imori, Akira Yamamoto, H. Matsumoto, K. Yamato, T. Yoshida, Keisuke Izumi, M. Sasaki, Tadashi Maeno, Nagataka Matsui, R. E. Streitmatter, Takamasa Yamagami, K. Tanizaki, Jonathan F. Ormes, Sadakazu Haino, Hideyuki Fuke, and Kazuaki Anraku
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Muon, Proton, chemistry, Spectrometer, chemistry.chemical_element, Atomic physics, Helium, Spectral line
Published: 2007

11. The BESS Program

Author: Hideyuki Fuke, Thomas Hams, N. Thakur, K. Abe, Y. Shikaze, Koji Yoshimura, J. Nishimura, Reiko Orito, Sadakazu Haino, M. H. Lee, T. Sanuki, R. E. Streitmatter, T. Yoshida, S. Orito, K. Sakai, John Mitchell, K. Tanaka, Akira Yamamoto, Mitsuaki Nozaki, Y. Makida, A. A. Moiseev, S. Matsuda, J. Suzuki, M. Sasaki, Kwangmoo Kim, Takamasa Yamagami, Eun-Suk Seo, and Jonathan F. Ormes
Subjects: Physics, Nuclear and High Energy Physics, Proton, Spectrometer, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, chemistry.chemical_element, Cosmic ray, Atomic and Molecular Physics, and Optics, Spectral line, Geomagnetic reversal, Interstellar medium, Nuclear physics, chemistry, Antiproton, High Energy Physics::Experiment, Nuclear Experiment, Helium
Abstract: 著者人数：28名, 資料番号: SA1000179000
Published: 2007

12. QCD coherence and correlations of particles with restricted momenta in hadronic Z decays

Author: G. ABBIENDI, C. AINSLEY, P. F. AKESSON, G. ALEXANDER, G. ANAGNOSTOU, K. J. ANDERSON, S. ASAI, D. AXEN, I. BAILEY, E. BARBERIO, T. BARILLARI, R. J. BARLOW, R. J. BATLEY, P. BECHTLE, T. BEHNKE, K. W. BELL, P. J. BELL, G. BELLA, A. BELLERIVE, G. BENELLI, S. BETHKE, O. BIEBEL, O. BOERIU, P. BOCK, M. BOUTEMEUR, R. M. BROWN, H. J. BURCKHART, S. CAMPANA, R. K. CARNEGIE, A. A. CARTER, J. R. CARTER, C. Y. CHANG, D. G. CHARLTON, A. CSILLING, S. DADO, A. DE ROECK, E. A. DE WOLF, S, K. DESCH, B. DIENES, J. DUBBERT, E. DUCHOVNI, G. DUCKECK, I. P. DUERDOTH, E. ETZION, F. FABBRI, P. FERRARI, F. FIEDLER, I. FLECK, M. FORD, A. FREY, P. GAGNON, J. W. GARY, C. GEICH GIMBEL, P. GIACOMELLI, M. GIUNTA, J. GOLDBERG, E. GROSS, J. GRUNHAUS, M. GRUW, P. O. GUNTHER, A. GUPTA, C. HAJDU, M. HAMANN, G. G. HANSON, A. HAREL, M. HAUSCHILD, C. M. HAWKES, R. HAWKINGS, R. J. HEMINGWAY, G. HERTEN, R. D. HEUER, J. C. HILL, D. HORVATH, P. IGO KEMENES, K. ISHII, H. JEREMIE, P. JOVANOVIC, T. R. JUNK, J. KANZAKI, D. KARLEN, K. KAWAGOE, T. KAWAMOTO, R. K. KEELER, R. G. KELLOGG, B. W. KENNEDY, S. KLUTH, T. KOBAYASHI, M. KOBEL, S. KOMAMIYA, T. KRAMER, A. KRASZNAHORKAY, P. KRIEGER, J. VON KROGH, T. KUHL, M. KUPPER, G. D. LAFFERTY, H. LANDSMAN, D. LANSKE, D. LELLOUCH, J. LETTSO, L. LEVINSON, J. LILLICH, S. L. LLOYD, F. K. LOEBINGER, J. LU27, A. LUDWIG, J. LUDWIG, W. MADER, S. MARCELLINI, A. J. MARTIN, T. MASHIMO, P. MATTIGM, J. MCKENNA, R. A. MCPHERSON, F. MEIJERS, W. MENGES, F. S. MERRITT, H. MES, N. MEYER, A. MICHELINI, S. MIHARA, G. MIKENBERG, D. J. MILLER, W. MOHR, T. MORI, A. MUTTER, K. NAGAI, I. NAKAMURA, H. NANJO, H. A. NEAL, R. NISIUS, S. W. O’NEALE, A. OH, M. J. OREGLIA, S. ORITO, C. PAHL, G. PASZTOR, J. R. PATER, J. E. PILCHER, J. PINFOLD, D. E. PLANE, O. POOTH, M. PRZYBYCIEN, A. QUADT, K. RABBERTZ, C. REMBSER, P. RENKEL, J. M. RONEY, Y. ROZEN, K. RUNGE, K. SACHS, T. SAEKI, E. K. G. SARKISYAN, A. D. SCHAILE, O. SCHAILE, P. SCHARFF HANSEN, J. SCHIECK, T. SCHORNER SADENIUS, M. SCHRODER, M. SCHUMACHER, R. SEUSTER, T. G. SHEARS, B. C. SHEN, P. SHERWOOD, A. SKUJA, A. M. SMITH, R. SOBIE, S. SOLDNER REMBOLD, F. SPANO, A. STAHL, D. STROM, R. STROHMER, S. TAREM, M. TASEVSKY, R. TEUSCHER, M. A. THOMSON, E. TORRENCE, D. TOYA, P. TRAN, I. TRIGGER, Z. TROCSANYI, E. TSUR, M. F. TURNER WATSON, I. UEDA, B. UJVARI, C. F. VOLLMER, P. VANNEREM, R. VERTESI, M. VERZOCCHI, H. VOSS, J. VOSSEBELD, C. P. WARD, D. R. WARD, P. M. WATKINS, A. T. WATSON, N. K. WATSON, P. S. WELLS, T. WENGLER, N. WERMES, G. W. WILSON1, J. A. WILSON, G. WOLF, T. R. WYATT, S. YAMASHITA, D. ZER ZION, L. ZIVKOVIC, BRAIBANT, SYLVIE, CAPILUPPI, PAOLO, CIOCCA, CLAUDIA, CUFFIANI, MARCO, GIACOMELLI, GIORGIO MARIA, ROSSI, ANTONIO MARIA, G.ABBIENDI, C.AINSLEY, P.F.AKESSON, G.ALEXANDER, G.ANAGNOSTOU, K.J.ANDERSON, S.ASAI, D.AXEN, I.BAILEY, E.BARBERIO, T.BARILLARI, R.J.BARLOW, R.J.BATLEY, P.BECHTLE, T.BEHNKE, K.W.BELL, P.J.BELL, G.BELLA, A.BELLERIVE, G.BENELLI, S.BETHKE, O.BIEBEL, O.BOERIU, P.BOCK, M.BOUTEMEUR, S.BRAIBANT, R.M.BROWN, H.J.BURCKHART, S.CAMPANA, P.CAPILUPPI, R.K.CARNEGIE, A.A.CARTER, J.R.CARTER, C.Y.CHANG, D.G.CHARLTON, C.CIOCCA, A.CSILLING, M.CUFFIANI, S.DADO, A.DE ROECK, E.A.DE WOLF, K.DESCH, B.DIENES, J.DUBBERT, E.DUCHOVNI, G.DUCKECK, I.P.DUERDOTH, E.ETZION, F.FABBRI, P.FERRARI, F.FIEDLER, I.FLECK, M.FORD, A.FREY, P.GAGNON, J.W.GARY, C.GEICH-GIMBEL, G.GIACOMELLI, P.GIACOMELLI, M.GIUNTA, J.GOLDBERG, E.GROSS, J.GRUNHAUS, M.GRUW, P.O.GUNTHER, A.GUPTA, C.HAJDU, M.HAMANN, G.G.HANSON, A.HAREL, M.HAUSCHILD, C.M.HAWKES, R.HAWKINGS, R.J.HEMINGWAY, G.HERTEN, R.D.HEUER, J.C.HILL, D.HORVATH, P. IGO-KEMENES, K. ISHII, H. JEREMIE, P. JOVANOVIC, T.R. JUNK, J.KANZAKI, D.KARLEN, K.KAWAGOE, T.KAWAMOTO, R.K.KEELER, R.G.KELLOGG, B.W.KENNEDY, S.KLUTH, T.KOBAYASHI, M.KOBEL, S.KOMAMIYA, T.KRAMER, A.KRASZNAHORKAY, P.KRIEGER, J. VON KROGH, T.KUHL, M.KUPPER, G.D. LAFFERTY, H. LANDSMAN, D. LANSKE, D. LELLOUCH, J. LETTSO, L. LEVINSON, J. LILLICH, S.L. LLOYD, F.K. LOEBINGER, J. LU27, A. LUDWIG, J. LUDWIG, W.MADER, S.MARCELLINI, A.J.MARTIN, T.MASHIMO, P.MATTIGM, J.MCKENNA, R.A.MCPHERSON, F.MEIJERS, W.MENGES, F.S.MERRITT, H.MES, N.MEYER, A.MICHELINI, S.MIHARA, G.MIKENBERG, D.J.MILLER, W.MOHR, T.MORI, A.MUTTER, K.NAGAI, I.NAKAMURA, H.NANJO, H.A.NEAL, R.NISIUS, S.W.O’NEALE, A.OH, M.J.OREGLIA, S.ORITO, C.PAHL, G.PASZTOR, J.R.PATER, J.E.PILCHER, J.PINFOLD, D.E.PLANE, O.POOTH, M.PRZYBYCIEN, A.QUADT, K.RABBERTZ, C.REMBSER, P.RENKEL, J.M.RONEY, A.M.ROSSI, Y.ROZEN, K.RUNGE, K. SACHS, T. SAEKI, E.K.G. SARKISYAN, A.D. SCHAILE, O. SCHAILE, P. SCHARFF-HANSEN, J. SCHIECK, T. SCHORNER-SADENIUS, M. SCHRODER, M. SCHUMACHER, R. SEUSTER, T.G. SHEARS, B.C. SHEN, P. SHERWOOD, A. SKUJA, A.M. SMITH, R. SOBIE, S. SOLDNER-REMBOLD, F. SPANO, A. STAHL, D. STROM, R. STROHMER, S.TAREM, M.TASEVSKY, R.TEUSCHER, M.A.THOMSON, E.TORRENCE, D.TOYA, P.TRAN, I.TRIGGER, Z.TROCSANYI, E.TSUR, M.F.TURNER-WATSON, I.UEDA, B.UJVARI, C.F.VOLLMER, P.VANNEREM, R.VERTESI, M.VERZOCCHI, H.VOSS, J.VOSSEBELD, C.P.WARD, D.R.WARD, P.M.WATKINS, A.T.WATSON, N.K.WATSON, P.S.WELLS, T.WENGLER, N.WERMES, G.W.WILSON1, J.A.WILSON, G.WOLF, T.R.WYATT, S.YAMASHITA, D. ZER-ZION, and L. ZIVKOVIC
Subjects: Quantum chromodynamics, Physics, Particle physics, Nuclear and High Energy Physics, Annihilation, 010308 nuclear & particles physics, Electron–positron annihilation, High Energy Physics::Lattice, Hadron, High Energy Physics::Phenomenology, Perturbative QCD, FOS: Physical sciences, Bose–Einstein correlations, HERA, Deep inelastic scattering, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, ddc:530, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, Particle Physics - Experiment
Abstract: QCD coherence effects are studied based on measurements of correlations of particles with either restricted transverse momenta, pT, Comment: 17 pages, 4 figures, Submitted to Phys. Letts. B
Published: 2006
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13. Search for radions at LEP2

Author: S. Yamashita, P. Igo-Kemenes, A. D. Schaile, K. Ishii, H. Jeremie, Gabriella Pasztor, P. Vannerem, H. Voss, D. E. Plane, O. Schaile, T. Kuhl, G. Giacomelli, Pamela Ferrari, P. Scharff-Hansen, C. P. Ward, S. Söldner-Rembold, P. Tran, Yoram Rozen, Matthias Schröder, D. Axen, R. M. Brown, A. De Roeck, M. Kobel, Lorne Levinson, I. R. Bailey, Ehud Duchovni, Oana Elena Vickey Boeriu, F. Spano, Kiyotomo Kawagoe, A. Gupta, A. Csilling, Frans Meijers, Junichi Kanzaki, Graham Wilson, J. Ludwig, T. Schörner-Sadenius, K. Runge, D. J. Miller, P. Bock, T. Kobayashi, A. Ludwig, J. Goldberg, C. Y. Chang, John Hill, Achim Stahl, B. C. Shen, Alain Bellerive, Daniel Lellouch, Shlomo Dado, D. R. Ward, A. M. Smith, Takehiko Mori, M. Donkers, Arnulf Quadt, P. M. Watkins, Siegfried Bethke, M. Przybycień, S. Campana, G. Anagnostou, N. K. Watson, A. A. Carter, George Lafferty, T. Behnke, A. J. Martin, Christoph Rembser, Satoshi Mihara, J. W. Gary, Klaus Rabbertz, Teresa Barillari, H. Landsman, P. Renkel, Gunter Wolf, M. Verzocchi, Stephen Lloyd, Andris Skuja, P. F. Åkesson, Giovanni Abbiendi, C. Ainsley, A. M. Rossi, Raimund Ströhmer, D. Karlen, Marek Tasevsky, Frank Fiedler, B. Dienes, Dezso Horvath, M. J. Oreglia, A. Michelini, P. Mättig, E. L. Barberio, Shoji Asai, P. Gagnon, Gianni Masetti, R. J. Hemingway, S. Braibant, J. Dubbert, R. K. Carnegie, J. Allison, Tetsuro Mashimo, M. F. Turner-Watson, J. Lillich, B. W. Kennedy, Tara Shears, Zoltan Laszlo Trocsanyi, P. Jovanovic, Claudia Ciocca, J. A. Wilson, K. Sachs, L. Zivkovic, C. Pahl, Peter Krieger, Dave Charlton, Philip Bechtle, C. F. Vollmer, Erez Etzion, Jochen Schieck, N. Meyer, Guenter Duckeck, Stefan Kluth, Shlomit Tarem, Paolo Giacomelli, R. J. Barlow, A. Mutter, J. R. Carter, M. Kupper, Richard Teuscher, Gideon Alexander, Paolo Capiluppi, M. Giunta, E. Tsur, C. M. Hawkes, W. Menges, Otmar Biebel, Isabel Marian Trigger, K. W. Bell, J. von Krogh, T. R. Wyatt, R. J. Hawkings, Tobias Kramer, James Pinfold, Alexander Oh, I. Nakamura, D. Lanske, S. W. O'Neale, Sachio Komamiya, R. D. Heuer, P. O. Günther, Gideon Bella, H. J. Burckhart, T. Saeki, K. J. Anderson, Norbert Wermes, T. Kawamoto, S. Orito, J. Grunhaus, J. M. Roney, M. Schumacher, Koichi Nagai, W. Mohr, E. A. De Wolf, P. Amaral, M. A. Thomson, E. K. U. Gross, H. Mes, I. P. Duerdoth, Eric Torrence, G. Mikenberg, R. J. Batley, P. J. Bell, H. Nanjo, M. Gruwé, Richard Nisius, Marco Cuffiani, M. Ford, A. Harel, Robert McPherson, K. D. Hoffman, Ikuo Ueda, D. M. Strom, Fabrizio Fabbri, A. Frey, J. Lu, W. F. Mader, P. S. Wells, A. T. Watson, M. Hamann, Richard Keeler, R. J. Sobie, Joost Vossebeld, Klaus Desch, T. R. Junk, M. Boutemeur, F. S. Merritt, Gregor Herten, J. A. McKenna, Christoph Geich-Gimbel, J. E. Pilcher, Thorsten Wengler, Gabriele Benelli, M. Hauschild, R. Vértesi, Gordon H. Hanson, Rolf Seuster, P. Sherwood, Oliver Pooth, R. G. Kellogg, Csaba Hajdu, Stefano Marcellini, James Letts, D. Zer-Zion, F. K. Loebinger, Ivor Fleck, Joleen Pater, Edward K. G. Sarkisyan, D. Toya, Balazs Ujvari, H. A. Neal, G.ABBIENDI, C.AINSLEY, P.F.°AKESSON, G.ALEXANDER, J.ALLISON, P.AMARAL, G.ANAGNOSTOU, K.J.ANDERSON, S.ASAI, D.AXEN, G.AZUELOS, I.BAILEY, E.BARBERIO, T.BARILLARI, R.J.BARLOW, R.J.BATLEY, P.BECHTLE, T.BEHNKE, K.W.BELL, P.J.BELL, G.BELLA, A.BELLERIVE, G.BENELLI, S.BETHKE, O.BIEBEL, O.BOERIU, P.BOCK, M.BOUTEMEUR, S.BRAIBANT, R.M.BROWN, K.BUESSER, H.J.BURCKHART, S.CAMPANA, P.CAPILUPPI, R.K.CARNEGIE, A.A.CARTER, J.R.CARTER, C.Y.CHANG, D.G.CHARLTON, C.CIOCCA, A.CSILLING, M.CUFFIANI, S.DADO, A.DE ROECK, E.A.DE WOLF, K.DESCH, B.DIENES, M.DONKERS, J.DUBBERT, E.DUCHOVNI, G.DUCKECK, I.P.DUERDOTH, E.ETZION, F.FABBRI, L.FELD, P.FERRARI, F.FIEDLER, I.FLECK, M.FORD, A.FREY, P.GAGNON, J.W.GARY, G.GAYCKEN, C.GEICH-GIMBEL, G.GIACOMELLI, P.GIACOMELLI, M.GIUNTA, J.GOLDBERG, E.GROSS, J.GRUNHAUS, M.GRUW´E, P.O.G¨UNTHER, A.GUPTA, C.HAJDU, M.HAMANN, G.G.HANSON, A.HAREL, M.HAUSCHILD, C.M.HAWKES, R.HAWKINGS, R.J.HEMINGWAY, G.HERTEN, R.D.HEUER, J.C.HILL, K.HOFFMAN, D.HORV´ATH, P. IGO-KEMENES, K. ISHII, H. JEREMIE, P. JOVANOVIC, T.R. JUNK, N.KANAYA, J.KANZAKI, D.KARLEN, K.KAWAGOE, T.KAWAMOTO, R.K.KEELER, R.G.KELLOGG, B.W.KENNEDY, S.KLUTH, T.KOBAYASHI, M.KOBEL, S.KOMAMIYA, T.KR¨AMER, P.KRIEGER, J. VON KROGH, K.KRUGER, T.KUHL, M.KUPPER, G.D. LAFFERTY, H. LANDSMAN, D. LANSKE, J.G. LAYTER, D. LELLOUCH, J. LETTSO, L. LEVINSON, J. LILLICH, S.L. LLOYD, F.K. LOEBINGER, J. LU, A. LUDWIG, J. LUDWIG, W.MADER, S.MARCELLINI, A.J.MARTIN, G.MASETTI, T.MASHIMO, P.M¨ATTIGM, J.MCKENNA, R.A.MCPHERSON, F.MEIJERS, W.MENGES, F.S.MERRITT, H.MES, N.MEYER, A.MICHELINI, S.MIHARA, G.MIKENBERG, D.J.MILLER, S.MOED, W.MOHR, T.MORI, A.MUTTER, K.NAGAI, I.NAKAMURA, H.NANJO, H.A.NEAL, R.NISIUS, S.W.O’NEALE, A.OH, M.J.OREGLIA, S.ORITO, C.PAHL, G.P´ASZTOR, J.R.PATER, J.E.PILCHER, J.PINFOLD, D.E.PLANE, O.POOTH, M.PRZYBYCIE´N, A.QUADT, K.RABBERTZ, C.REMBSER, P.RENKEL, J.M.RONEY, A.M.ROSSI, Y.ROZEN, K.RUNGE, K. SACHS, T. SAEKI, E.K.G. SARKISYAN, A.D. SCHAILE, O. SCHAILE, P. SCHARFF-HANSEN, J. SCHIECK, T. SCH¨ORNER-SADENIUS, M. SCHR¨ODER, M. SCHUMACHER, W.G. SCOTT, R. SEUSTER, T.G. SHEARS, B.C. SHEN, P. SHERWOOD, A. SKUJA, A.M. SMITH, R. SOBIE, S. S¨OLDNER-REMBOLD, F. SPANO, A. STAHL, D. STROM, R. STR¨OHMER, S.TAREM, M.TASEVSKY, R.TEUSCHER, M.A.THOMSON, E.TORRENCE, D.TOYA, P.TRAN, I.TRIGGER, Z.TR´OCS´ANYI, E.TSUR, M.F.TURNER-WATSON, I.UEDA, B.UJV´ARI, C.F.VOLLMER, P.VANNEREM, R.V´ERTESI, M.VERZOCCHI, H.VOSS, J.VOSSEBELD, C.P.WARD, D.R.WARD, P.M.WATKINS, A.T.WATSON, N.K.WATSON, P.S.WELLS, T.WENGLER, N.WERMES, G.W.WILSON, J.A.WILSON, G.WOLF, T.R.WYATT, S.YAMASHITA, D. ZER-ZION, L. ZIVKOVIC, and OPAL Collaboration
Subjects: Particle physics, Nuclear and High Energy Physics, High Energy Physics::Lattice, FOS: Physical sciences, Elementary particle, 01 natural sciences, 7. Clean energy, Standard Model, High Energy Physics - Experiment, symbols.namesake, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, 010306 general physics, Boson, Physics, Condensed Matter::Quantum Gases, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hierarchy problem, Scalar boson, Higgs field, Higgs boson, symbols, High Energy Physics::Experiment, Higgs mechanism, Particle Physics - Experiment
Abstract: A new scalar resonance, called the radion, with couplings to fermions and bosons similar to those of the Higgs boson, is predicted in the framework of Randall-Sundrum models, proposed solutions to the hierarchy problem with one extra dimension. An important distinction between the radion and the Higgs boson is that the radion would couple directly to gluon pairs, and in particular its decay products would include a significant fraction of gluon jets. The radion had the same quantum numbers as the Standard Model (SM) Higgs boson, and therefore they can mix, with the resulting mass eigenstates having properties different from those of the SM Higgs boson. Existing searches for the Higgs boson are sensitive to the possible production and decay of radions and Higgs bosons in these models. For the first time, searches for the SM Higgs boson and flavour-independent and decay-mode independent searches for a neutral Higgs boson are used in combination to explore the parameter space of the Randall-Sundrum model. In the dataset recorded by the OPAL experiment at LEP, no evidence for radion or Higgs particle production was observed in any of those searches. The results are used to set limits on the radion and Higgs boson masses., Comment: 18 pages, 6 figures, Submitted to Phys. Lett. B
Published: 2005
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14. Measurements of Rb in e+e− collisions at s between 182 and 209 GeV

Author: A. Csilling, P. Mättig, Shoji Asai, Daniel Lellouch, Takehiko Mori, W. F. Mader, E. Torrence, A. Gupta, Dave Charlton, O. Schaile, Yoram Rozen, Junichi Kanzaki, Paolo Giacomelli, J. Goldberg, J. M. Roney, M. Schumacher, Andris Skuja, Christoph Geich-Gimbel, R. Nisius, R. Vértesi, George Lafferty, Graham Wilson, P. S. Wells, Matthias Schröder, Tetsuro Mashimo, M. F. Turner-Watson, Satoshi Mihara, P. Gagnon, Gianni Masetti, R. D. Heuer, Koichi Nagai, A. T. Watson, Shlomo Dado, E. A. De Wolf, D. E. Plane, C. F. Vollmer, Achim Stahl, Gideon Bella, S. Yamashita, P. Igo-Kemenes, Gordon H. Hanson, Klaus Rabbertz, Stephen Lloyd, Zoltan Laszlo Trocsanyi, M. Hauschild, H. J. Burckhart, W. Mohr, N. Meyer, M. Kupper, P. Tran, F. S. Merritt, A. Harel, N. K. Watson, Alain Bellerive, M. A. Thomson, K. Ishii, R. K. Carnegie, T. Schörner-Sadenius, Ikuo Ueda, D. M. Strom, J. A. Wilson, P. Amaral, Oliver Pooth, H. Jeremie, E. K. U. Gross, J. Lu, Tara Shears, D. Axen, John Allison, S. Campana, D. J. Miller, Kiyotomo Kawagoe, M. Gruwé, Oana Elena Vickey Boeriu, F. Spano, C. Ainsley, Gabriella Pasztor, J. A. McKenna, Peter Sherwood, Gideon Alexander, T. Barillari, P. Vannerem, J. Ludwig, K. Runge, P. Bock, M. Hamann, R. J. Hemingway, James Pinfold, R. G. Kellogg, C. P. Ward, G. Anagnostou, R. Seuster, A. Michelini, H. Mes, J. Lillich, M. Boutemeur, A. D. Schaile, Marco Cuffiani, Csaba Hajdu, S. Söldner-Rembold, Thorsten Wengler, B. W. Kennedy, Ehud Duchovni, R. K. Keeler, I. P. Duerdoth, P. Jovanovic, R. M. Brown, Lorne Levinson, Stefano Marcellini, R. J. Sobie, A. J. Martin, Peter Krieger, T. Kuhl, Christoph Rembser, James Letts, Arnulf Quadt, Joost Vossebeld, I. R. Bailey, F. Fiedler, O. Biebel, Klaus Desch, S. Bethke, P. M. Watkins, Alessandro Montanari, D. Zer-Zion, P. J. Bell, G. Mikenberg, Claudia Ciocca, Richard Teuscher, T. Behnke, F. K. Loebinger, Gabriele Benelli, K. Sachs, Philip Bechtle, M. Ford, H. Landsman, P. Renkel, Ivor Fleck, T. Kobayashi, Pamela Ferrari, A. Ludwig, R. J. Batley, Joleen Pater, Erez Etzion, D. R. Ward, P. Scharff-Hansen, S. Kluth, Edward K. G. Sarkisyan, D. Toya, T. R. Junk, Balazs Ujvari, H. A. Neal, E. L. Barberio, T. R. Wyatt, A. M. Smith, Robert McPherson, Gregor Herten, H. Nanjo, Shlomit Tarem, K. D. Hoffman, Fabrizio Fabbri, A. Frey, J. von Krogh, H. Voss, J. Dubbert, M. Giunta, G. Giacomelli, A. De Roeck, M. Kobel, R. J. Hawkings, Gunter Wolf, J. E. Pilcher, Frans Meijers, D. Karlen, G. Duckeck, M. Przybycień, A. A. Carter, M. Verzocchi, P. F. Åkesson, Giovanni Abbiendi, B. C. Shen, M. Donkers, J. W. Gary, Marek Tasevsky, Dezso Horvath, W. Menges, Norbert Wermes, T. Kawamoto, S. Orito, E. Tsur, C. M. Hawkes, M. J. Oreglia, S. Braibant, Isabel Marian Trigger, K. W. Bell, L. Zivkovic, J. R. Carter, J. C. Hill, Tobias Kramer, Jochen Schieck, R. J. Barlow, R. Ströhmer, Alexander Oh, I. Nakamura, D. Lanske, J. Grunhaus, Sachio Komamiya, T. Saeki, Alessandra Fanfani, Beatrix Dienes, C. Y. Chang, A. Mutter, S. W. O'Neale, C. Pahl, P. O. Günther, and K. J. Anderson
Subjects: Nuclear physics, Physics, Quark, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Electron–positron annihilation, 0103 physical sciences, Charm (quantum number), 010306 general physics, 01 natural sciences, Standard Model, Lepton
Abstract: Measurements of R b , the ratio of the b b ¯ cross-section to the q q ¯ cross-section in e + e − collisions, are presented. The data were collected by the OPAL experiment at LEP at centre-of-mass energies between 182 and 209 GeV. Lepton, lifetime and event-shape information is used to tag events containing b quarks with high efficiency. The data are compatible with the Standard Model expectation. The mean ratio of the eight measurements reported here to the Standard Model prediction is 1.055 ± 0.031 ± 0.037 , where the first error is statistical and the second systematic.
Published: 2005

15. Determination of the LEP beam energy using radiative fermion-pair events

Author: Siegfried Bethke, J. W. Gary, Dezso Horvath, W. Menges, Otmar Biebel, G. W. Wilson, M. Hamann, M. Hauschild, Richard Keeler, J. Goldberg, R. J. Sobie, Joost Vossebeld, George Lafferty, Klaus Desch, Christoph Rembser, H. Landsman, W. F. Mader, Gunter Wolf, Erez Etzion, S. W. O'Neale, Stefan Kluth, Shlomit Tarem, P. O. Günther, Norbert Wermes, T. Kawamoto, M. Giunta, D. Karlen, Satoshi Mihara, P. S. Wells, P. Sherwood, Oliver Pooth, S. Orito, A. T. Watson, Alain Bellerive, E. Tsur, C. M. Hawkes, E. L. Barberio, Isabel Marian Trigger, K. W. Bell, K. J. Anderson, H. Mes, Kiyotomo Kawagoe, John Allison, A. Harel, Ikuo Ueda, D. M. Strom, J. C. Hill, J. Lu, I. P. Duerdoth, Tobias Kramer, R. J. Hemingway, Gianni Masetti, M. J. Oreglia, C. Y. Chang, Shlomo Dado, J. Lillich, Achim Stahl, S. Braibant, N. K. Watson, Sachio Komamiya, Dave Charlton, L. Zivkovic, Frank Fiedler, Thorsten Wengler, B. W. Kennedy, P. Jovanovic, J. R. Carter, D. Toya, Tara Shears, M. Przybycień, Peter Krieger, C. Ainsley, A. M. Rossi, Raimund Ströhmer, Christoph Geich-Gimbel, Giora Mikenberg, R. G. Kellogg, R. J. Batley, Gideon Alexander, J. M. Roney, A. A. Carter, Csaba Hajdu, R. D. Heuer, P. J. Bell, Stefano Marcellini, S. Yamashita, M. Schumacher, A. D. Schaile, Gabriella Pasztor, T. Saeki, James Letts, P. Vannerem, M. Verzocchi, Gideon Bella, Gabriele Benelli, P. F. Åkesson, Giovanni Abbiendi, Beatrix Dienes, Klaus Rabbertz, P. Igo-Kemenes, Stephen Lloyd, M. Tasevsky, R. Vértesi, Yoram Rozen, E. A. De Wolf, R. M. Brown, Lorne Levinson, Claudia Ciocca, T. Behnke, K. Sachs, C. P. Ward, Philip Bechtle, H. J. Burckhart, S. Söldner-Rembold, Ehud Duchovni, Alexander Oh, P. Amaral, I. R. Bailey, J. Dubbert, R. K. Carnegie, K. Ishii, H. Jeremie, A. Michelini, Arnulf Quadt, Matthias Schröder, Koichi Nagai, D. J. Miller, T. R. Junk, T. Kobayashi, K. Hoffman, A. Ludwig, Gregor Herten, W. Mohr, J. A. Wilson, Junichi Kanzaki, M. Boutemeur, F. S. Merritt, P. Gagnon, I. Nakamura, D. Lanske, D. E. Plane, P. M. Watkins, A. Mutter, Robert McPherson, D. R. Ward, Zoltan Laszlo Trocsanyi, O. Schaile, Paolo Giacomelli, Gordon H. Hanson, J. A. McKenna, T. Schörner-Sadenius, J. E. Pilcher, P. Renkel, Daniel Lellouch, T. Kuhl, P. Tran, Fabrizio Fabbri, A. Frey, Takehiko Mori, H. Nanjo, D. Zer-Zion, A. J. Martin, D. Axen, F. K. Loebinger, M. Ford, Oana Elena Vickey Boeriu, F. Spano, Ivor Fleck, P. Capiluppi, Joleen Pater, Edward K. G. Sarkisyan, J. Ludwig, K. Runge, P. Bock, M. A. Thomson, Balazs Ujvari, H. A. Neal, C. F. Vollmer, J. von Krogh, A. Gupta, Jochen Schieck, R. J. Hawkings, E. K. U. Gross, J. Grunhaus, C. Pahl, Teresa Barillari, R. J. Barlow, A. Csilling, M. Gruwé, Eric Torrence, Richard Nisius, P. Mättig, Shoji Asai, Marco Cuffiani, H. Voss, Andris Skuja, G. Giacomelli, Pamela Ferrari, A. De Roeck, M. Kobel, Tetsuro Mashimo, M. F. Turner-Watson, Frans Meijers, N. Meyer, M. Kupper, G. Anagnostou, James Pinfold, R. Seuster, P. Scharff-Hansen, Guenter Duckeck, A. M. Smith, S. Campana, Richard Teuscher, T. R. Wyatt, B. C. Shen, M. Donkers, G.ABBIENDI, C.AINSLEY, P.F.°AKESSON, G.ALEXANDER, J.ALLISON, P.AMARAL, G.ANAGNOSTOU, K.J.ANDERSON, S.ASAI, D.AXEN, G.AZUELOS, I.BAILEY, E.BARBERIO, T.BARILLARI, R.J.BARLOW, R.J.BATLEY, P.BECHTLE, T.BEHNKE, K.W.BELL, P.J.BELL, G.BELLA, A.BELLERIVE, G.BENELLI, S.BETHKE, O.BIEBEL, O.BOERIU, P.BOCK, M.BOUTEMEUR, S.BRAIBANT, R.M.BROWN, K.BUESSER, H.J.BURCKHART, S.CAMPANA, P.CAPILUPPI, R.K.CARNEGIE, A.A.CARTER, J.R.CARTER, C.Y.CHANG, D.G.CHARLTON, C.CIOCCA, A.CSILLING, M.CUFFIANI, S.DADO, A.DE ROECK, E.A.DE WOLF, K.DESCH, B.DIENES, M.DONKERS, J.DUBBERT, E.DUCHOVNI, G.DUCKECK, I.P.DUERDOTH, E.ETZION, F.FABBRI, L.FELD, P.FERRARI, F.FIEDLER, I.FLECK, M.FORD, A.FREY, P.GAGNON, J.W.GARY, G.GAYCKEN, C.GEICH-GIMBEL, G.GIACOMELLI, P.GIACOMELLI, M.GIUNTA, J.GOLDBERG, E.GROSS, J.GRUNHAUS, M.GRUW´E, P.O.G¨UNTHER, A.GUPTA, C.HAJDU, M.HAMANN, G.G.HANSON, A.HAREL, M.HAUSCHILD, C.M.HAWKES, R.HAWKINGS, R.J.HEMINGWAY, G.HERTEN, R.D.HEUER, J.C.HILL, K.HOFFMAN, D.HORV´ATH, P. IGO-KEMENES, K. ISHII, H. JEREMIE, P. JOVANOVIC, T.R. JUNK, N.KANAYA, J.KANZAKI, D.KARLEN, K.KAWAGOE, T.KAWAMOTO, R.K.KEELER, R.G.KELLOGG, B.W.KENNEDY, S.KLUTH, T.KOBAYASHI, M.KOBEL, S.KOMAMIYA, T.KR¨AMER, P.KRIEGER, J. VON KROGH, K.KRUGER, T.KUHL, M.KUPPER, G.D. LAFFERTY, H. LANDSMAN, D. LANSKE, J.G. LAYTER, D. LELLOUCH, J. LETTSO, L. LEVINSON, J. LILLICH, S.L. LLOYD, F.K. LOEBINGER, J. LU, A. LUDWIG, J. LUDWIG, W.MADER, S.MARCELLINI, A.J.MARTIN, G.MASETTI, T.MASHIMO, P.M¨ATTIGM, J.MCKENNA, R.A.MCPHERSON, F.MEIJERS, W.MENGES, F.S.MERRITT, H.MES, N.MEYER, A.MICHELINI, S.MIHARA, G.MIKENBERG, D.J.MILLER, S.MOED, W.MOHR, T.MORI, A.MUTTER, K.NAGAI, I.NAKAMURA, H.NANJO, H.A.NEAL, R.NISIUS, S.W.O’NEALE, A.OH, M.J.OREGLIA, S.ORITO, C.PAHL, G.P´ASZTOR, J.R.PATER, J.E.PILCHER, J.PINFOLD, D.E.PLANE, O.POOTH, M.PRZYBYCIE´N, A.QUADT, K.RABBERTZ, C.REMBSER, P.RENKEL, J.M.RONEY, A.M.ROSSI, Y.ROZEN, K.RUNGE, K. SACHS, T. SAEKI, E.K.G. SARKISYAN, A.D. SCHAILE, O. SCHAILE, P. SCHARFF-HANSEN, J. SCHIECK, T. SCH¨ORNER-SADENIUS, M. SCHR¨ODER, M. SCHUMACHER, W.G. SCOTT, R. SEUSTER, T.G. SHEARS, B.C. SHEN, P. SHERWOOD, A. SKUJA, A.M. SMITH, R. SOBIE, S. S¨OLDNER-REMBOLD, F. SPANO, A. STAHL, D. STROM, R. STR¨OHMER, S.TAREM, M.TASEVSKY, R.TEUSCHER, M.A.THOMSON, E.TORRENCE, D.TOYA, P.TRAN, I.TRIGGER, Z.TR´OCS´ANYI, E.TSUR, M.F.TURNER-WATSON, I.UEDA, B.UJV´ARI, C.F.VOLLMER, P.VANNEREM, R.V´ERTESI, M.VERZOCCHI, H.VOSS, J.VOSSEBELD, C.P.WARD, D.R.WARD, P.M.WATKINS, A.T.WATSON, N.K.WATSON, P.S.WELLS, T.WENGLER, N.WERMES, G.W.WILSON, J.A.WILSON, G.WOLF, T.R.WYATT, S.YAMASHITA, D. ZER-ZION, L. ZIVKOVIC, and OPAL Collaboration
Subjects: Physics, Particle physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Hadron, FOS: Physical sciences, Fermion, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Calibration, Radiative transfer, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Beam energy
Abstract: We present a determination of the LEP beam energy using "radiative return" fermion-pair events recorded at centre-of-mass energies from 183 GeV to 209 GeV. We find no evidence of a disagreement between the OPAL data and the LEP Energy Workings Group's standard calibration. Including the energy- averaged 11 MeV uncertainty in the standard determination, the beam energy we obtain from the OPAL data is higher than that obtained from the LEP calibration by 0+-34(stat.)+-27(syst.)MeV, Comment: 24 pages, 5 figures, Submitted to Phys. Letts. B
Published: 2004
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16. Multi-photon events with large missing energy in e+e− collisions at s=192–209 GeV

Author: James Pinfold, R. Seuster, P. Scharff-Hansen, A. M. Smith, Andris Skuja, Tetsuro Mashimo, M. F. Turner-Watson, N. Meyer, M. Kupper, Daniel Lellouch, Takehiko Mori, L. Brigliadori, T. Behnke, S. W. O'Neale, P. O. Günther, J. Goldberg, M. Boutemeur, F. S. Merritt, K. J. Anderson, Thorsten Wengler, B. C. Shen, M. Donkers, Yoram Rozen, Siegfried Bethke, J. A. McKenna, Tara Shears, W. G. Scott, S. Yamashita, Junichi Kanzaki, Silvia Arcelli, J. W. Gary, P. Igo-Kemenes, K. Buesser, M. Gruwé, K. Ishii, H. Jeremie, Gideon Bella, Gianni Masetti, C. Y. Chang, R. M. Brown, Lorne Levinson, Christoph Rembser, Christoph Geich-Gimbel, Teresa Barillari, H. J. Burckhart, A. Csilling, S. Moed, Gabriele Benelli, Guenter Duckeck, D. Axen, Dezso Horvath, Erez Etzion, Richard Nisius, Graham Wilson, I. R. Bailey, O. Schaile, Oana Elena Vickey Boeriu, Raimund Ströhmer, Stefan Kluth, T. Kuhl, Shlomit Tarem, P. Mättig, Shoji Asai, Marco Cuffiani, Shlomo Dado, Richard Teuscher, A. J. Martin, F. Spano, M. J. Oreglia, M. Hauschild, M. Giunta, D. Zer-Zion, Robert McPherson, L. Zivkovic, Lutz Feld, D. Toya, P. J. Bell, G. Gaycken, W. Mader, Beatrix Dienes, F. K. Loebinger, C. Pahl, Giora Mikenberg, M. Schumacher, Matthias Schröder, Alexander Oh, J. R. Carter, W. Menges, Otmar Biebel, Paolo Giacomelli, Ivor Fleck, J. Ludwig, K. Runge, P. Bock, Georges Azuelos, T. R. Wyatt, I. Nakamura, D. Lanske, T. R. Junk, A. D. Schaile, Joleen Pater, Edward K. G. Sarkisyan, Gabriella Pasztor, K. Hoffman, E. Tsur, Gregor Herten, C. M. Hawkes, E. A. De Wolf, P. Vannerem, H. Nanjo, T. Schörner-Sadenius, Fabrizio Fabbri, A. Frey, Balazs Ujvari, H. A. Neal, Isabel Marian Trigger, K. W. Bell, A. Gupta, C. F. Vollmer, C. P. Ward, P. Gagnon, A. Harel, J. E. Pilcher, J. C. Hill, George Lafferty, Norbert Wermes, T. Kawamoto, Jochen Schieck, Ikuo Ueda, D. M. Strom, R. J. Barlow, J. Lu, Tobias Kramer, P. Amaral, Satoshi Mihara, S. Söldner-Rembold, Gunter Wolf, S. Orito, Zoltan Laszlo Trocsanyi, Kiyotomo Kawagoe, Gideon Alexander, D. Karlen, Frank Fiedler, B. Poli, R. K. Keeler, Dave Charlton, P. S. Wells, Arnulf Quadt, H. Mes, P. M. Watkins, A. T. Watson, Klaus Rabbertz, I. P. Duerdoth, S. Braibant, P. Renkel, Stephen Lloyd, P. Sherwood, Achim Stahl, Oliver Pooth, Ehud Duchovni, John Allison, D. E. Plane, N. Kanaya, A. Michelini, R. G. Kellogg, M. Hamann, R. D. Heuer, Csaba Hajdu, T. Kobayashi, A. Ludwig, Stefano Marcellini, Claudia Ciocca, James Letts, R. Vértesi, R. J. Sobie, Joost Vossebeld, Klaus Desch, P. Tran, K. Sachs, Philip Bechtle, Gordon H. Hanson, D. R. Ward, M. Ford, N. K. Watson, R. J. Batley, S. Campana, C. Ainsley, J. von Krogh, R. J. Hawkings, J. Dubbert, R. K. Carnegie, J. A. Wilson, M. A. Thomson, E. K. U. Gross, Eric Torrence, D. J. Miller, R. J. Hemingway, J. Lillich, B. W. Kennedy, P. Jovanovic, Peter Krieger, M. Przybycień, H. Landsman, A. A. Carter, E. L. Barberio, M. Verzocchi, P. F. Åkesson, Giovanni Abbiendi, J. M. Roney, M. Tasevsky, Koichi Nagai, W. Mohr, J. Grunhaus, A. Mutter, Sachio Komamiya, K. Kruger, T. Saeki, J. G. Layter, Alain Bellerive, G. Anagnostou, H. Voss, G. Giacomelli, Pamela Ferrari, A. De Roeck, M. Kobel, and Frans Meijers
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Missing energy, 010308 nuclear & particles physics, Electron–positron annihilation, 01 natural sciences, 7. Clean energy, Nuclear physics, Massless particle, Pair production, Excited state, 0103 physical sciences, Neutralino, Gravitino, 010306 general physics, Bhabha scattering
Abstract: Events with a final state consisting of two or more photons and large missing transverse energy have been observed in e + e − collisions at centre-of-mass energies in the range 192–209 GeV using the OPAL detector at LEP. Cross-section measurements are performed within the kinematic acceptance of the selection and compared with the expectations from the Standard Model process e + e − → ν ν ¯ γ γ ( γ ) . No evidence for new physics contributions to this final state is observed. Upper limits on σ ( e + e − → X X ) ⋅ BR 2 ( X → Y γ ) are derived for the case of stable and invisible Y. In the case of massive Y the combined limits obtained from all the data range from 10 to 60 fb, while for the special case of massless Y the range is 20 to 40 fb. The limits apply to pair production of excited neutrinos ( X = ν * , Y = ν ), to neutralino production ( X = χ ˜ 2 0 , Y = χ ˜ 1 0 ) and to supersymmetric models in which X = χ ˜ 1 0 and Y = G ˜ is a light gravitino.
Published: 2004

17. Flavour independent search for Higgs bosons decaying into hadronic final states in e+e− collisions at LEP

Author: Silvia Arcelli, N. Kanaya, Daniel Lellouch, Erez Etzion, Gordon H. Hanson, M. Ford, Takehiko Mori, A. Okpara, Stefan Kluth, Shlomit Tarem, T. R. Junk, Christoph Geich-Gimbel, Gregor Herten, R. M. Brown, Lorne Levinson, J. Böhme, M. Giunta, Gianni Masetti, C. Y. Chang, Alexander Oh, C. Pahl, T. Behnke, A. J. Martin, Georges Azuelos, E. Tsur, C. M. Hawkes, J. Goldberg, A. Hocker, S. Moed, G. D. Lafferty, S. Yamashita, E. K. U. Gross, I. R. Bailey, Gideon Bella, H. J. Burckhart, I. Nakamura, D. Lanske, D. R. Ward, K. Hoffman, H. Mes, P. Igo-Kemenes, A. Mutter, J. E. Pilcher, A. D. Schaile, Isabel Marian Trigger, K. W. Bell, M. A. Thomson, Robert McPherson, Gabriella Pasztor, P. Vannerem, Fabrizio Fabbri, A. Frey, Raimund Ströhmer, R. J. Hemingway, I. P. Duerdoth, M. Gruwé, K. Ishii, H. Jeremie, P. Gagnon, S. Braibant, James Pinfold, D. Zer-Zion, W. Mader, J. C. Hill, Lutz Feld, B. W. Kennedy, F. K. Loebinger, J. Lillich, A. Harel, Thorsten Wengler, R. Seuster, Tobias Kramer, Ikuo Ueda, D. M. Strom, D. E. Plane, Klaus Rabbertz, Ivor Fleck, Yoram Rozen, R. K. Keeler, Christoph Rembser, J. M. Roney, M. Boutemeur, F. S. Merritt, J. Lu, Joleen Pater, Edward K. G. Sarkisyan, C. P. Ward, Zoltan Laszlo Trocsanyi, B. Poli, Richard Teuscher, Stephen Lloyd, B. C. Shen, P. Jovanovic, Tara Shears, M. Tasevsky, Beatrix Dienes, Richard Nisius, M. Donkers, P. Tran, O. Schaile, M. Przybycień, A. Klier, R. J. Batley, Balazs Ujvari, H. A. Neal, Arnulf Quadt, Koichi Nagai, W. Mohr, Marco Cuffiani, S. Söldner-Rembold, Gabriele Benelli, Siegfried Bethke, W. G. Scott, Peter Krieger, Junichi Kanzaki, J. W. Gary, P. M. Watkins, T. Kuhl, Paolo Giacomelli, A. A. Carter, Gunter Wolf, N. K. Watson, G. Gaycken, J. A. McKenna, J. Grunhaus, L. Brigliadori, M. Hamann, K. Buesser, M. Schumacher, M. Hauschild, D. Karlen, P. Renkel, Oliver Pooth, C. F. Vollmer, E. A. De Wolf, John Allison, Teresa Barillari, M. Verzocchi, S. W. O'Neale, P. O. Günther, A. Csilling, C. Ainsley, M. J. Oreglia, Dezso Horvath, Stefano Rosati, Jochen Schieck, R. J. Sobie, R. J. Barlow, P. Scharff-Hansen, E. Torrence, A. Gupta, Dave Charlton, P. F. Åkesson, Giovanni Abbiendi, D. Axen, Oana Elena Vickey Boeriu, P. Amaral, Gideon Alexander, K. J. Anderson, F. Spano, R. G. Kellogg, Joost Vossebeld, Sachio Komamiya, Graham Wilson, Matthias Schröder, Klaus Desch, P. J. Bell, Peter Sherwood, Csaba Hajdu, L. Zivkovic, D. J. Miller, Stefano Marcellini, J. Ludwig, P. Mättig, Shoji Asai, Satoshi Mihara, Shlomo Dado, Ehud Duchovni, A. M. Smith, J. R. Carter, Katja Klein, K. Runge, P. Bock, Achim Stahl, James Letts, W. Menges, Otmar Biebel, D. Waller, K. Kruger, T. Saeki, R. D. Heuer, A. Michelini, Andris Skuja, T. Schörner-Sadenius, J. von Krogh, H. Landsman, Guenter Duckeck, Kiyotomo Kawagoe, P. S. Wells, Frank Fiedler, D. Toya, T. Kobayashi, Tetsuro Mashimo, M. F. Turner-Watson, A. Ludwig, Claudia Ciocca, K. Sachs, H. Nanjo, Terry Richard Wyatt, A. T. Watson, S. Campana, Giora Mikenberg, Philip Bechtle, M. Kupper, E. L. Barberio, R. J. Hawkings, Norbert Wermes, T. Kawamoto, D. Wetterling, S. Orito, J. Dubbert, R. K. Carnegie, J. A. Wilson, H. Voss, G. Giacomelli, A. De Roeck, M. Kobel, Frans Meijers, Alain Bellerive, G. Anagnostou, Pamela Ferrari, J. G. Layter, and R. Vértesi
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, Hadron, Scalar boson, 01 natural sciences, Standard Model, Nuclear physics, Pair production, 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Boson, Event generator
Abstract: A search for the Higgsstrahlung process e + e − → hZ is described, where the neutral Higgs boson h is assumed to decay into hadronic final states. In order to be sensitive to a broad range of models, the search is performed independent of the flavour content of the Higgs boson decay. The analysis is based on e + e − collision data collected by the OPAL detector at energies between 192 and 209 GeV. The search does not reveal any significant excess over the Standard Model background prediction. Results are combined with previous searches at energies around 91 and at 189 GeV. A limit is set on the product of the cross-section and the hadronic branching ratio of the Higgs boson, as a function of the Higgs boson mass. Assuming the hZ coupling predicted by the Standard Model, and a Higgs boson decaying only into hadronic final states, a lower bound of 104 GeV / c 2 is set on the mass at the 95% confidence level.
Published: 2004

18. Study of Bose-Einstein correlations in ${\rm e}^ + {\rm e}^-\to {\rm W}^ + {\rm W}^-$ events at LEP

Author: N. Kanaya, Christoph Geich-Gimbel, H. Mes, I. P. Duerdoth, M. J. Oreglia, M. A. Thomson, E. K. U. Gross, Shlomo Dado, S. Braibant, Alexander Oh, R. M. Brown, Lorne Levinson, L. Zivkovic, M. Przybycień, Tara Shears, T. Barillari, Guenter Duckeck, M. Hamann, J. Grunhaus, J. R. Carter, A. Csilling, I. Nakamura, D. Lanske, J. M. Roney, A. A. Carter, B. Poli, Ehud Duchovni, M. Tasevsky, Richard Teuscher, D. Toya, D. R. Ward, Koichi Nagai, I. R. Bailey, Lutz Feld, W. Mohr, M. Verzocchi, S. Yamashita, P. F. Åkesson, Giovanni Abbiendi, Thorsten Wengler, K. Hoffman, P. Igo-Kemenes, R. J. Sobie, C. Pahl, A. Michelini, R. J. Batley, Joost Vossebeld, H. Landsman, W. Menges, Otmar Biebel, Satoshi Mihara, K. Ishii, H. Jeremie, Klaus Desch, Georges Azuelos, E. Tsur, C. F. Vollmer, Gideon Bella, T. R. Wyatt, P. Mättig, Shoji Asai, D. Zer-Zion, Giora Mikenberg, M. Boutemeur, F. S. Merritt, Katja Klein, D. E. Plane, C. M. Hawkes, Pamela Ferrari, J. G. Layter, J. von Krogh, H. J. Burckhart, N. K. Watson, Matthias Schröder, James Pinfold, R. Seuster, G. Gaycken, F. K. Loebinger, Isabel Marian Trigger, K. W. Bell, Jochen Schieck, T. Kobayashi, O. Schaile, M. Schumacher, P. Gagnon, R. J. Hawkings, E. L. Barberio, J. A. McKenna, Frank Fiedler, A. Ludwig, R. J. Barlow, Kiyotomo Kawagoe, Ivor Fleck, J. C. Hill, Yoram Rozen, L. Brigliadori, Tobias Kramer, P. Tran, T. Kuhl, B. C. Shen, E. A. De Wolf, S. Campana, Joleen Pater, P. S. Wells, C. Ainsley, T. Schörner-Sadenius, M. Donkers, J. Dubbert, R. K. Carnegie, Siegfried Bethke, Norbert Wermes, Edward K. G. Sarkisyan, A. T. Watson, P. Amaral, S. W. O'Neale, Andris Skuja, W. G. Scott, Junichi Kanzaki, J. A. Wilson, T. Kawamoto, J. Goldberg, K. Buesser, J. W. Gary, A. D. Schaile, Gabriella Pasztor, Gabriele Benelli, Tetsuro Mashimo, M. F. Turner-Watson, Daniel Lellouch, A. J. Martin, P. O. Günther, Balazs Ujvari, A. Mutter, D. J. Miller, Zoltan Laszlo Trocsanyi, Takehiko Mori, P. Vannerem, H. A. Neal, A. Harel, S. Orito, N. Meyer, Dezso Horvath, Ikuo Ueda, D. M. Strom, J. Lu, M. Kupper, K. J. Anderson, Gideon Alexander, C. P. Ward, W. Mader, Robert McPherson, Dave Charlton, S. Söldner-Rembold, Alain Bellerive, Gianni Masetti, C. Y. Chang, Fabrizio Fabbri, A. Frey, P. Scharff-Hansen, E. Torrence, A. Gupta, Sachio Komamiya, S. Moed, R. D. Heuer, T. R. Junk, A. M. Smith, R. J. Hemingway, G. Anagnostou, Klaus Rabbertz, Stephen Lloyd, Oliver Pooth, Gregor Herten, K. Kruger, T. Saeki, H. Voss, John Allison, J. Lillich, B. W. Kennedy, Raimund Ströhmer, G. Giacomelli, P. Jovanovic, A. De Roeck, M. Kobel, Christoph Rembser, Peter Krieger, J. E. Pilcher, R. G. Kellogg, G. W. Wilson, Frans Meijers, M. Hauschild, Beatrix Dienes, Csaba Hajdu, Erez Etzion, Stefano Marcellini, Stefan Kluth, Shlomit Tarem, James Letts, R. Vértesi, M. Giunta, T. Behnke, Gordon H. Hanson, M. Ford, Thomas Kress, Gunter Wolf, D. Karlen, D. Axen, Oana Elena Vickey Boeriu, F. Spano, Peter Sherwood, J. Ludwig, K. Runge, P. Bock, G. D. Lafferty, R. K. Keeler, Arnulf Quadt, P. M. Watkins, P. Renkel, M. Gruwé, Richard Nisius, Marco Cuffiani, P. J. Bell, Achim Stahl, H. Nanjo, Claudia Ciocca, K. Sachs, Philip Bechtle, and Paolo Giacomelli
Subjects: Condensed Matter::Quantum Gases, Nuclear physics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Monte Carlo method, High Energy Physics::Experiment, Bose–Einstein correlations, Engineering (miscellaneous), Bar (unit), Boson
Abstract: Bose-Einstein correlations between like-sign charged-particle pairs in e(+)e(-) --> W+ W- events recorded with the OPAL detector at LEP at centre-of-mass energies between 183 GeV and 209 GeV are studied. Recently proposed methods which allow direct searches for correlations in the data via distributions of test variables are used to investigate the presence of correlations between hadrons originating from different W bosons in W+W- --> q (q) over barq (q) over bar events. Within the statistics of the data sample no evidence for inter - WW Bose-Einstein correlations is obtained. The data are also compared with predictions of a recent implementation of Bose-Einstein correlation effects in the Monte Carlo model PYTHIA.
Published: 2004

19. Determination of α S using OPAL hadronic event shapes at $\sqrt{s} = 91\mbox{--}209~\mathrm{GeV}$ and resummed NNLO calculations

Author: P. Scharff-Hansen, Siegfried Bethke, C. Y. Chang, I. Nakamura, D. Axen, Oana Elena Vickey Boeriu, A. M. Smith, Gideon Bella, J. W. Gary, H. J. Burckhart, H. Mes, A. J. Martin, I. P. Duerdoth, Peter Sherwood, Marek Tasevsky, Richard Teuscher, Dezso Horvath, J. Ludwig, K. Runge, P. Bock, D. Zer-Zion, James Pinfold, A. Quadt, R. Seuster, Gunter Wolf, Oliver Pooth, F. K. Loebinger, Ivor Fleck, R. G. Kellogg, Csaba Hajdu, Alexander Oh, Stefano Marcellini, James Letts, Joleen Pater, Edward K. G. Sarkisyan, D. Toya, Graham Wilson, Christoph Geich-Gimbel, Balazs Ujvari, H. A. Neal, Yoram Rozen, D. Karlen, W. Mader, P. J. Bell, M. J. Oreglia, S. Braibant, C. Pahl, G. Mikenberg, R. Vértesi, Shlomo Dado, T. R. Wyatt, Gordon H. Hanson, A. Krasznahorkay, D. Lanske, S. W. O'Neale, Junichi Kanzaki, Sachio Komamiya, Matthias Schröder, M. Gruwe, J. M. Roney, Francesco Spanò, Andris Skuja, K. J. Anderson, Dave Charlton, R. J. Batley, P. Igo-Kemenes, W. Menges, Otmar Biebel, R. K. Keeler, J. Lillich, Koichi Nagai, J. Goldberg, E. Tsur, C. M. Hawkes, P. Gagnon, B. W. Kennedy, Raimund Ströhmer, Tetsuro Mashimo, M. F. Turner-Watson, P. Jovanovic, W. Mohr, K. Ishii, H. Jeremie, A. D. Schaile, Gabriella Pasztor, Isabel Marian Trigger, K. W. Bell, Daniel Lellouch, P. Vannerem, Claudia Ciocca, P. M. Watkins, T. Saeki, J. C. Hill, C. F. Vollmer, M. Boutemeur, F. S. Merritt, N. Meyer, M. Kupper, Peter Krieger, T. Schörner-Sadenius, Zoltan Laszlo Trocsanyi, Takehiko Mori, K. Sachs, J. R. Carter, Tobias Kramer, C. P. Ward, H. Nanjo, Philip Bechtle, Steve Lloyd, Tara Shears, P. Renkel, R. M. Brown, Lorne Levinson, Norbert Wermes, Christoph Rembser, S. Söldner-Rembold, Gideon Alexander, M. A. Thomson, Beatrix Dienes, E. K. U. Gross, H. Voss, Jochen Schieck, S. Campana, O. Schaile, Paolo Capiluppi, T. Kawamoto, I. R. Bailey, M. Schumacher, G. Duckeck, J. A. McKenna, S. Orito, J. Dubbert, Erez Etzion, A. Mutter, Teresa Barillari, Stefan Kluth, Satoru Yamashita, A. Csilling, T. Kuhl, R. J. Barlow, R. K. Carnegie, Shlomit Tarem, E. A. De Wolf, Klaus Rabbertz, M. Giunta, D. E. Plane, N. K. Watson, P. Mättig, D. J. Miller, Shoji Asai, T. Behnke, L. Zivkovic, J. A. Wilson, J. Grunhaus, M. Dallavalle, H. Landsman, C. Ainsley, A. M. Rossi, Ehud Duchovni, Marco Cuffiani, A. Michelini, E. L. Barberio, T. Kobayashi, A. Ludwig, E. Torrence, A. Gupta, Paolo Giacomelli, D. R. Ward, Alain Bellerive, George Lafferty, M. Przybycień, G. Anagnostou, A. A. Carter, Satoshi Mihara, Achim Stahl, G. Giacomelli, M. Verzocchi, P. F. Åkesson, Giovanni Abbiendi, Frank Fiedler, A. De Roeck, M. Kobel, Frans Meijers, M. Ford, Pamela Ferrari, J. von Krogh, R. J. Hawkings, Kiyotomo Kawagoe, Robert McPherson, R. D. Heuer, Fabrizio Fabbri, A. Frey, M. Hamann, R. J. Sobie, Joost Vossebeld, Klaus Desch, A. Harel, Ikuo Ueda, D. M. Strom, J. Lu, P. S. Wells, A. T. Watson, M. Hauschild, T. R. Junk, Thorsten Wengler, Gabriele Benelli, Gregor Herten, J. E. Pilcher, B. C. Shen, G. Abbiendi, C. Ainsley, P. F. Åkesson, G. Alexander, G. Anagnostou, K. J. Anderson, S. Asai, D. Axen, I. Bailey, E. Barberio, T. Barillari, R. J. Barlow, R. J. Batley, P. Bechtle, T. Behnke, K. W. Bell, P. J. Bell, G. Bella, A. Bellerive, G. Benelli, S. Bethke, O. Biebel, O. Boeriu, P. Bock, M. Boutemeur, S. Braibant, R. M. Brown, H. J. Burckhart, S. Campana, P. Capiluppi, R. K. Carnegie, A. A. Carter, J. R. Carter, C. Y. Chang, D. G. Charlton, C. Ciocca, A. Csilling, M. Cuffiani, S. Dado, M. Dallavalle, A. Roeck, E. A. Wolf, K. Desch, B. Diene, J. Dubbert, E. Duchovni, G. Duckeck, I. P. Duerdoth, E. Etzion, F. Fabbri, P. Ferrari, F. Fiedler, I. Fleck, M. Ford, A. Frey, P. Gagnon, J. W. Gary, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, M. Giunta, J. Goldberg, E. Gro, J. Grunhau, M. Gruwé, A. Gupta, C. Hajdu, M. Hamann, G. G. Hanson, A. Harel, M. Hauschild, C. M. Hawke, R. Hawking, G. Herten, R. D. Heuer, J. C. Hill, D. Horváth, P. Igo-Kemene, K. Ishii, H. Jeremie, P. Jovanovic, T. R. Junk, J. Kanzaki, D. Karlen, K. Kawagoe, T. Kawamoto, R. K. Keeler, R. G. Kellogg, B. W. Kennedy, S. Kluth, T. Kobayashi, M. Kobel, S. Komamiya, T. Krämer, A. Krasznahorkay, P. Krieger, J. Krogh, T. Kuhl, M. Kupper, G. D. Lafferty, H. Landsman, D. Lanske, D. Lellouch, J. Lett, L. Levinson, J. Lillich, S. L. Lloyd, F. K. Loebinger, J. Lu, A. Ludwig, J. Ludwig, W. Mader, S. Marcellini, A. J. Martin, T. Mashimo, P. Mättig, J. McKenna, R. A. McPherson, F. Meijer, W. Menge, F. S. Merritt, H. Me, N. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D. J. Miller, W. Mohr, T. Mori, A. Mutter, K. Nagai, I. Nakamura, H. Nanjo, H. A. Neal, S. W. O’Neale, A. Oh, M. J. Oreglia, S. Orito, C. Pahl, G. Pásztor, J. R. Pater, J. E. Pilcher, J. Pinfold, D. E. Plane, O. Pooth, M. Przybycień, A. Quadt, K. Rabbertz, C. Rembser, P. Renkel, J. M. Roney, A. M. Rossi, Y. Rozen, K. Runge, K. Sach, T. Saeki, E. K. G. Sarkisyan, A. D. Schaile, O. Schaile, P. Scharff-Hansen, J. Schieck, T. Schörner-Sadeniu, M. Schröder, M. Schumacher, R. Seuster, T. G. Shear, B. C. Shen, P. Sherwood, A. Skuja, A. M. Smith, R. Sobie, S. Söldner-Rembold, F. Spano, A. Stahl, D. Strom, R. Ströhmer, S. Tarem, M. Tasevsky, R. Teuscher, M. A. Thomson, E. Torrence, D. Toya, I. Trigger, Z. Trócsányi, E. Tsur, M. F. Turner-Watson, I. Ueda, B. Ujvári, C. F. Vollmer, P. Vannerem, R. Vértesi, M. Verzocchi, H. Vo, J. Vossebeld, C. P. Ward, D. R. Ward, P. M. Watkin, A. T. Watson, N. K. Watson, P. S. Well, T. Wengler, N. Werme, G. W. Wilson, J. A. Wilson, G. Wolf, T. R. Wyatt, S. Yamashita, D. Zer-Zion, and L. Zivkovic
Subjects: Quantum chromodynamics, Physics, Particle physics, Annihilation, OPAL, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Electron–positron annihilation, Hadron, Nuclear Theory, LEP, 01 natural sciences, Asymptotic freedom, Nuclear physics, Renormalization, ALFA_S, 0103 physical sciences, High Energy Physics::Experiment, Gauge theory, 010306 general physics, Event (particle physics), Engineering (miscellaneous)
Abstract: Hadronic event shape distributions from e+e− annihilation measured by the OPAL experiment at centre-of-mass energies between 91 GeV and 209 GeV are used to determine the strong coupling α S. The results are based on QCD predictions complete to the next-to-next-to-leading order (NNLO), and on NNLO calculations matched to the resummed next-to-leading-log-approximation terms (NNLO + NLLA). The combined NNLO result from all variables and centre-of-mass energies is while the combined NNLO + NLLA result is The completeness of the NNLO and NNLO + NLLA results with respect to missing higher order contributions, studied by varying the renormalization scale, is improved compared to previous results based on NLO or NLO + NLLA predictions only. The observed energy dependence of α S agrees with the QCD prediction of asymptotic freedom and excludes the absence of running.
Published: 2011

20. Measurement of Cosmic-Ray Proton and Antiproton Spectra at Mountain Altitude

Author: Kazuhiro Tanaka, Yasuhiro Makida, Hideyuki Fuke, Sadakazu Haino, Tadashi Maeno, M. Fujikawa, H. Matsumoto, Yoshihisa Yamamoto, Kazuaki Anraku, Jun-ichi Suzuki, Koji Yoshimura, Nagataka Matsui, H. Matsunaga, T. Sanuki, M. Sasaki, Tetsuya Yoshida, Keisuke Izumi, K. Yamato, M. Imori, J. Nishimura, K. Abe, S. Orito, Y. Shikaze, Mitsuaki Nozaki, and Akira Yamamoto
Subjects: Physics, Nuclear and High Energy Physics, Antiparticle, Proton, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Cosmic ray, Astrophysics, Baryon, Nuclear physics, Altitude, Antiproton, Antimatter, Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Nucleon
Abstract: 著者人数: 25名, Accepted: 2003-10-08, 資料番号: SA1003537000
Published: 2003

21. Search for the single production of doubly-charged Higgs bosons and constraints on their couplings from Bhabha scattering

Author: C. F. Vollmer, Jochen Schieck, R. J. Barlow, Alexander Oh, I. Nakamura, D. Lanske, Graham Wilson, Gunter Wolf, K. Stephens, N. Kanaya, Tara Shears, Shlomo Dado, D. Karlen, H. Mes, I. P. Duerdoth, S. Braibant, K. Hoffman, A. Leins, P. Gagnon, S. Yamashita, P. Igo-Kemenes, K. Ishii, H. Jeremie, Richard Teuscher, D. Toya, Giora Mikenberg, Arnulf Quadt, O. Schaile, H. Landsman, P. M. Watkins, J. Grunhaus, P. J. Bell, L. Brigliadori, T. Kuhl, R. J. Batley, M. J. Oreglia, A. D. Schaile, Gabriella Pasztor, P. Vannerem, D. R. Ward, Yoram Rozen, Zoltan Laszlo Trocsanyi, Dong Hee Kim, G. Gaycken, L. L. Kormos, G. Anagnostou, Richard J. K. Taylor, Gideon Bella, James Pinfold, R. Seuster, L. Zivkovic, E. L. Barberio, P. Renkel, M. Schumacher, A. J. Martin, H. J. Burckhart, M. Groll, Silvia Arcelli, D. E. Plane, S. W. O'Neale, C. P. Ward, Satoshi Mihara, P. O. Günther, Erez Etzion, J. R. Carter, G. N. Patrick, Katja Klein, Junichi Kanzaki, J. Polok, Stefan Kluth, Shlomit Tarem, W. Menges, Otmar Biebel, S. Söldner-Rembold, Sachio Komamiya, K. Buesser, E. A. De Wolf, Pamela Ferrari, J. G. Layter, M. Giunta, Georges Azuelos, K. J. Anderson, Daniel Lellouch, P. Amaral, J. A. McKenna, W. Mader, E. Tsur, C. M. Hawkes, J. Goldberg, Frank Fiedler, H. Nanjo, D. Waller, Takehiko Mori, A. Okpara, D. Axen, Oana Elena Vickey Boeriu, K. Kruger, T. Saeki, Gianni Masetti, C. Y. Chang, P. Tran, Matthias Schröder, Norbert Wermes, T. Kawamoto, C. Pahl, D. J. Miller, F. Spano, Peter Sherwood, Isabel Marian Trigger, K. W. Bell, G. D. Lafferty, S. Orito, H. Voss, T. J. McMahon, J. C. Hill, J. Ludwig, Christoph Rembser, P. Scharff-Hansen, K. Runge, S. Moed, P. Bock, Tobias Kramer, W. J. McDonald, B. C. Shen, P. F. Åkesson, Klaus Rabbertz, R. J. Hemingway, M. Donkers, Siegfried Bethke, M. A. Thomson, Stephen Lloyd, J. Dubbert, Robert Vertesi, R. K. Carnegie, T. Schörner-Sadenius, J. Lillich, G. Giacomelli, W. G. Scott, Dave Charlton, M. Gruwé, Raimund Ströhmer, A. M. Smith, A. Mutter, C. Hensel, A. De Roeck, M. Kobel, P. Jovanovic, E. K. U. Gross, Peter Krieger, J. W. Gary, Ehud Duchovni, Andris Skuja, T. Behnke, Frans Meijers, Guenter Duckeck, K. Harder, Richard Nisius, Tetsuro Mashimo, M. F. Turner-Watson, A. Macpherson, A. Michelini, Shoji Asai, Marek Tasevsky, Paolo Giacomelli, Dezso Horvath, R. D. Heuer, J. A. Wilson, Marco Cuffiani, M. Kupper, Beatrix Dienes, T. Kobayashi, S. Campana, J. M. Roney, R. M. Brown, Lorne Levinson, M. Harin-Dirac, Koichi Nagai, B. W. Kennedy, I. R. Bailey, W. Mohr, G. Karapetian, Gideon Alexander, Achim Stahl, E. Torrence, A. Gupta, A. Csilling, S. Rosati, A. Harel, Ikuo Ueda, D. M. Strom, J. Lu, M. Hamann, Richard Keeler, R. J. Sobie, Joost Vossebeld, Klaus Desch, T. R. Junk, P. S. Wells, Robert McPherson, J. von Krogh, Terry Richard Wyatt, A. T. Watson, Fabrizio Fabbri, A. Frey, R. J. Hawkings, D. Wetterling, M. Przybycień, A. A. Carter, M. Verzocchi, Giovanni Abbiendi, Christoph Geich-Gimbel, A. Fürtjes, Lutz Feld, M. Boutemeur, F. S. Merritt, Kiyotomo Kawagoe, G. P. Siroli, Christoph Schwick, Thorsten Wengler, B. Caron, Gabriele Benelli, M. Hauschild, Gregor Herten, J. E. Pilcher, N. K. Watson, C. Ainsley, P. Mättig, Alain Bellerive, B. Poli, K. Sachs, Philip Bechtle, Oliver Pooth, John Allison, R. G. Kellogg, Csaba Hajdu, Stefano Marcellini, James Letts, D. Zer-Zion, F. K. Loebinger, Ivor Fleck, Joleen Pater, Edward K. G. Sarkisyan, A. Klier, Balazs Ujvari, H. A. Neal, Gordon H. Hanson, and M. Ford
Subjects: Physics, Particle physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Yukawa potential, FOS: Physical sciences, 01 natural sciences, Lepton number, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment, Lepton, Event generator, Bhabha scattering, Boson
Abstract: A search for single production of doubly-charged Higgs bosons has been performed using 600.7 pb^-1 of e+e- collision data with sqrt(s)=189--209GeV collected by the OPAL detector at LEP. No evidence for the existence of H++/-- is observed. Upper limits on the Yukawa coupling of the H++/-- to like-signed electron pairs are derived. Additionally, indirect constraints on the Yukawa coupling from Bhabha scattering, where the H++/-- would contribute via t-channel exchange, are derived for M(H++/--) < 2TeV. These are the first results for both a single production search and constraints from Bhabha scattering reported from LEP., 20 pages, 9 figures, Submitted to Phys. Lett. B
Published: 2003
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22. Search for stable and long-lived massive charged particles in e+e− collisions at =130209 GeV

Author: D. Axen, Oana Elena Vickey Boeriu, James Pinfold, W. J. McDonald, R. Seuster, C. F. Vollmer, F. Spano, Gideon Bella, H. J. Burckhart, Peter Sherwood, B. C. Shen, Jochen Schieck, P. Mättig, Shoji Asai, R. J. Barlow, J. Ludwig, K. Runge, P. Bock, A. D. Schaile, Gabriella Pasztor, G. P. Siroli, Daniel Lellouch, Christoph Schwick, M. Donkers, Takehiko Mori, A. Okpara, Siegfried Bethke, P. Vannerem, P. F. Åkesson, W. G. Scott, D. E. Plane, C. P. Ward, P. Tran, C. Hensel, S. Söldner-Rembold, J. W. Gary, H. Mes, Alexander Oh, Kiyotomo Kawagoe, J. Goldberg, L. L. Kormos, T. Behnke, Oliver Pooth, K. Hoffman, John Allison, I. Nakamura, H. Landsman, S. Yamashita, P. Igo-Kemenes, Ehud Duchovni, A. Leins, D. Lanske, I. P. Duerdoth, S. Braibant, Dave Charlton, A. J. Martin, W. Menges, Otmar Biebel, P. Gagnon, L. Brigliadori, R. K. Keeler, Guenter Duckeck, K. Ishii, H. Jeremie, Marek Tasevsky, Dezso Horvath, E. Torrence, A. Gupta, A. Csilling, Graham Wilson, M. Gruwé, N. K. Watson, Zoltan Laszlo Trocsanyi, Dong Hee Kim, Yoram Rozen, Shlomo Dado, Arnulf Quadt, W. Mader, P. M. Watkins, R. D. Heuer, Richard Nisius, D. Toya, A. Michelini, Tara Shears, R. G. Kellogg, E. L. Barberio, K. Harder, O. Schaile, T. Kuhl, T. Kobayashi, Christoph Rembser, Richard J. K. Taylor, Erez Etzion, Giora Mikenberg, R. J. Batley, Csaba Hajdu, Marco Cuffiani, Junichi Kanzaki, J. Polok, Stefano Marcellini, S. Campana, P. Renkel, R. M. Brown, Stefan Kluth, K. Buesser, G. Gaycken, C. Ainsley, Lorne Levinson, Silvia Arcelli, Shlomit Tarem, James Letts, P. J. Bell, M. A. Thomson, S. W. O'Neale, R. J. Hemingway, I. R. Bailey, Georges Azuelos, M. Schumacher, E. Tsur, E. K. U. Gross, J. Lillich, C. M. Hawkes, P. O. Günther, B. W. Kennedy, E. A. De Wolf, M. Giunta, P. Jovanovic, Isabel Marian Trigger, K. W. Bell, Norbert Wermes, Peter Krieger, T. Kawamoto, Gideon Alexander, Gordon H. Hanson, Gunter Wolf, H. Nanjo, P. Amaral, J. C. Hill, Tobias Kramer, Richard Teuscher, M. Ford, J. M. Roney, K. J. Anderson, C. Pahl, D. Karlen, Koichi Nagai, S. Orito, W. Mohr, Raimund Ströhmer, Klaus Rabbertz, B. Poli, Stephen Lloyd, T. R. Wyatt, George Lafferty, Satoshi Mihara, M. J. Oreglia, Katja Klein, K. Sachs, Philip Bechtle, L. Zivkovic, D. Zer-Zion, J. R. Carter, G. N. Patrick, F. K. Loebinger, Ivor Fleck, Frank Fiedler, K. Stephens, N. Kanaya, Joleen Pater, Edward K. G. Sarkisyan, A. Klier, Beatrix Dienes, Balazs Ujvari, H. A. Neal, M. Boutemeur, F. S. Merritt, Gianni Masetti, C. Y. Chang, D. R. Ward, J. A. McKenna, S. Moed, Christoph Geich-Gimbel, J. Grunhaus, A. Fürtjes, Lutz Feld, M. Hamann, Sachio Komamiya, R. J. Sobie, Thorsten Wengler, Joost Vossebeld, B. Caron, D. Waller, K. Kruger, T. Saeki, Klaus Desch, Gabriele Benelli, P. Scharff-Hansen, A. M. Smith, Andris Skuja, Tetsuro Mashimo, M. F. Turner-Watson, A. Macpherson, T. R. Junk, A. Mutter, M. Kupper, P. S. Wells, M. Hauschild, A. T. Watson, Matthias Schröder, T. J. McMahon, Achim Stahl, D. J. Miller, J. Dubbert, Robert Vertesi, R. K. Carnegie, S. Rosati, J. A. Wilson, Gregor Herten, Robert McPherson, G. Karapetian, A. Harel, T. Schörner-Sadenius, Alain Bellerive, Ikuo Ueda, D. M. Strom, J. Lu, Fabrizio Fabbri, A. Frey, J. E. Pilcher, M. Przybycień, A. A. Carter, M. Verzocchi, G. Anagnostou, Paolo Giacomelli, Giovanni Abbiendi, J. von Krogh, M. Harin-Dirac, R. J. Hawkings, D. Wetterling, Pamela Ferrari, J. G. Layter, H. Voss, G. Giacomelli, A. De Roeck, M. Kobel, and Frans Meijers
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Muon, 010308 nuclear & particles physics, Scalar (mathematics), Supersymmetry, 01 natural sciences, Electric charge, Charged particle, Nuclear physics, Chargino, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment, Lepton
Abstract: A search for stable and long-lived massive particles of electric charge |Q/e|=1 or fractional charges of 2/3, 4/3, and 5/3 is reported using data collected by the OPAL detector at LEP, at centre-of-mass energies from 130 to 209 GeV. These particles are assumed to be pair-produced in e+e- collisions and not to interact strongly. No evidence for the production of these particles was observed. Model-independent upper limits on the production cross-section between 0.005 and 0.028 pb have been derived for scalar and spin-1/2 particles with charge +-1. Within the framework of the Constrained Minimal Supersymmetric Standard Model (CMSSM), this implies a lower limit of 98.0 (98.5) GeV on the mass of long-lived right (left)- handed scalar muons and scalar taus. Long-lived charged heavy leptons and charginos are excluded for masses below 102.0 GeV. For particles with fractional charge +-2/3, +-4/3, and +-5/3, the upper limit on the production cross-section varies between 0.005 and 0.020 pb. All mass and cross-section limits are derived at the 95% confidence level and are valid for particles with lifetimes longer than 10-6s. A search for stable and long-lived massive particles of electric charge | Q / e |=1 or fractional charges of 2/3, 4/3, and 5/3 is reported using data collected by the OPAL detector at LEP, at centre-of-mass energies from 130 to 209 GeV. These particles are assumed to be pair-produced in e + e − collisions and not to interact strongly. No evidence for the production of these particles was observed. Model-independent upper limits on the production cross-section between 0.005 and 0.028 pb have been derived for scalar and spin-1/2 particles with charge ±1. Within the framework of the Constrained Minimal Supersymmetric Standard Model (CMSSM), this implies a lower limit of 98.0 (98.5) GeV on the mass of long-lived right- (left-)handed scalar muons and scalar taus. Long-lived charged heavy leptons and charginos are excluded for masses below 102.0 GeV. For particles with fractional charge ±2/3, ±4/3 and ±5/3, the upper limit on the production cross-section varies between 0.005 and 0.020 pb. All mass and cross-section limits are derived at the 95% confidence level and are valid for particles with lifetimes longer than 10 −6 s. A search for stable and long-lived massive particles of electric charge |Q/e|=1 or fractional charges of 2/3, 4/3, and 5/3 is reported using data collected by the OPAL detector at LEP, at centre-of-mass energies from 130 to 209 GeV. These particles are assumed to be pair-produced in e+e- collisions and not to interact strongly. No evidence for the production of these particles was observed. Model-independent upper limits on the production cross-section between 0.005 and 0.028 pb have been derived for scalar and spin-1/2 particles with charge +-1. Within the framework of the Constrained Minimal Supersymmetric Standard Model (CMSSM), this implies a lower limit of 98.0 (98.5) GeV on the mass of long-lived right (left)- handed scalar muons and scalar taus. Long-lived charged heavy leptons and charginos are excluded for masses below 102.0 GeV. For particles with fractional charge +-2/3, +-4/3, and +-5/3, the upper limit on the production cross-section varies between 0.005 and 0.020 pb. All mass and cross-section limits are derived at the 95% confidence level and are valid for particles with lifetimes longer than 10-6s.
Published: 2003

23. Search for nearly mass-degenerate charginos and neutralinos at LEP

Author: Gordon H. Hanson, M. Ford, D. Zer-Zion, F. K. Loebinger, Ivor Fleck, Joleen Pater, Edward K. G. Sarkisyan, Oliver Pooth, A. Klier, John Allison, Balazs Ujvari, H. A. Neal, Daniele Bonacorsi, Gideon Bella, R. G. Kellogg, Csaba Hajdu, Stefano Marcellini, James Letts, Sachio Komamiya, Graham Wilson, Daniel Lellouch, D. Krop, M. A. Thomson, S. Campana, Raimund Ströhmer, Christoph Geich-Gimbel, S. Yamashita, D. E. Plane, Takehiko Mori, A. Okpara, P. J. Bell, K. Hoffman, A. Leins, N. K. Watson, J. Goldberg, D. Waller, K. Kruger, T. Saeki, H. J. Burckhart, P. Igo-Kemenes, H. Mes, I. P. Duerdoth, E. K. U. Gross, Shlomo Dado, C. F. Vollmer, K. Ishii, H. Jeremie, L. L. Kormos, P. Gagnon, S. Braibant, G. M. Dallavalle, Jochen Schieck, Vakhtang Kartvelishvili, P. Tran, J. von Krogh, A. Fürtjes, A. J. Martin, R. J. Barlow, Beatrix Dienes, A. Mutter, C. Ainsley, P. Scharff-Hansen, K. Stephens, O. Sahr, Lutz Feld, Zoltan Laszlo Trocsanyi, N. Kanaya, M. J. Oreglia, Dong Hee Kim, D. Toya, R. J. Hawkings, J. Hauschildt, P. Hüntemeyer, I. K. Klein, Gianni Masetti, O. Schaile, Christoph Rembser, C. Y. Chang, Richard Teuscher, M. Boutemeur, F. S. Merritt, D. Wetterling, D. J. Miller, Giora Mikenberg, A. M. Smith, J. Grunhaus, S. Moed, R. J. Batley, Paolo Giacomelli, Richard J. K. Taylor, P. F. Åkesson, W. Mader, S.J. Dallison, L. Zivkovic, H. Voss, Erez Etzion, G. Gaycken, S. Spagnolo, J. A. McKenna, M. Harin-Dirac, M. Schumacher, J. R. Carter, Stefan Kluth, Matthias Schröder, R. J. Homer, James Pinfold, R. Seuster, Shlomit Tarem, A. D. Schaile, Gabriella Pasztor, G. N. Patrick, D. R. Ward, R. J. Hemingway, M. Gruwé, W. Menges, Otmar Biebel, P. Vannerem, L. Brigliadori, J. Lillich, C. Hensel, G. Giacomelli, Satoshi Mihara, M. Przybycień, E. A. De Wolf, B. W. Kennedy, T. Kress, M. Giunta, E. Torrence, Achim Stahl, P. Mättig, P. Jovanovic, A. De Roeck, M. Kobel, A. A. Carter, T. Behnke, Shoji Asai, Gideon Alexander, B. Poli, S. W. O'Neale, P. Amaral, A. Gupta, Georges Azuelos, Peter Krieger, R. V. Kowalewski, Richard Nisius, Alexander Oh, Frank Fiedler, I. J. Bloodworth, P. O. Günther, E. Tsur, C. M. Hawkes, T. Schörner-Sadenius, C. P. Ward, Gunter Wolf, Isabel Marian Trigger, K. W. Bell, Andris Skuja, D. Lanske, Marco Cuffiani, M. Verzocchi, J. C. Hill, Tara Shears, Tetsuro Mashimo, S. Söldner-Rembold, Giovanni Abbiendi, D. Axen, K. J. Anderson, Tobias Kramer, W. J. McDonald, B. C. Shen, M. F. Turner-Watson, Frans Meijers, A. Macpherson, Yoram Rozen, Norbert Wermes, H. Landsman, T. Kawamoto, Oana Elena Vickey Boeriu, M. Donkers, Siegfried Bethke, C. H. Shepherd-Themistocleous, W. G. Scott, T. J. McMahon, F. Spano, I. Nakamura, M. Kupper, J. W. Gary, S. Orito, Peter Sherwood, J. Dubbert, R. K. Carnegie, P. Mendez-Lorenzo, Marek Tasevsky, Dezso Horvath, Thomas E Marchant, Guenter Duckeck, E. L. Barberio, J. A. Wilson, J. Ludwig, K. Harder, K. Runge, P. Bock, Dave Charlton, J. M. Roney, Thorsten Wengler, K. Sachs, B. Caron, Pamela Ferrari, J. G. Layter, G. Karapetian, Philip Bechtle, Junichi Kanzaki, J. Polok, D. Karlen, Ehud Duchovni, Koichi Nagai, W. Mohr, R. M. Brown, Lorne Levinson, K. Buesser, Gabriele Benelli, T. R. Junk, R. D. Heuer, A. Michelini, I. R. Bailey, P. S. Wells, T. Kobayashi, M. Hauschild, Terry Richard Wyatt, A. T. Watson, Klaus Rabbertz, Stephen Lloyd, J. P. Martin, Gregor Herten, Alain Bellerive, M. Hamann, J. E. Pilcher, Richard Keeler, G. Anagnostou, R. J. Sobie, Joost Vossebeld, Klaus Desch, R. Howard, A. Tricoli, Robert McPherson, S. Rosati, Arnulf Quadt, Fabrizio Fabbri, A. Frey, E. Elfgren, A. Harel, Ikuo Ueda, D. M. Strom, P. M. Watkins, J. Lu, H. Rick, G. P. Siroli, Christoph Schwick, P. Renkel, Silvia Arcelli, A. Csilling, C. Pahl, G. D. Lafferty, B. Vachon, Kiyotomo Kawagoe, T. Trefzger, Opal, Collaboration, G., Abbiendi, and Spagnolo, Stefania Antonia
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, FOS: Physical sciences, Superpartner, 01 natural sciences, Supersymmetry breaking, High Energy Physics - Experiment, Standard Model, Nuclear physics, High Energy Physics - Experiment (hep-ex), Chargino, 0103 physical sciences, Neutralino, High Energy Physics::Experiment, 010306 general physics, Engineering (miscellaneous), Particle Physics - Experiment, Minimal Supersymmetric Standard Model, Bhabha scattering, Event generator
Abstract: A search was performed for charginos with masses close to the mass of the lightest neutralino in e+e- collisions at centre-of-mass energies of 189-209 GeV recorded by the OPAL detector at LEP. Events were selected if they had an observed high-energy photon from initial state radiation, reducing the dominant background from two-photon scattering to a negligible level. No significant excess over Standard Model expectations has been observed in the analysed data set corresponding to an integrated luminosity of 570pb-1. Upper limits were derived on the chargino pair-productin cross-section, and lower limits on the chargino mass were derived in the context of the Minimal Supersymmetric Extension of the Standard Model for the gravity and anomaly mediated Supersymmetry breaking scenarios., 26 pages, 9 figures
Published: 2003

24. Development of a liquid xenon scintillation detector for a new experiment to search for μ→eγ decays

Author: K. Terasawa, Takayuki Ishida, Wataru Ootani, Satoshi Mihara, Toshinori Mori, S. Suzuki, Tetsuro Mashimo, J. Yashima, Tomiyoshi Haruyama, Hajime Nishiguchi, K. Ozone, T. Yoshimura, A. Maki, T. Mitsuhashi, Masaki Yamashita, Ryu Sawada, S. Orito, and Tadayoshi Doke
Subjects: Physics, Nuclear and High Energy Physics, Muon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Detector, Gamma ray, chemistry.chemical_element, Scintillator, Particle detector, Nuclear physics, Xenon, chemistry, Scintillation counter, Measuring instrument, High Energy Physics::Experiment, Instrumentation
Abstract: A novel gamma-ray detector based on a liquid xenon scintillator is under development for a new experiment to search for the lepton flavor violating process μ + →e + γ at the Paul Scherrer Institute (PSI). The experiment is designed to have a sensitivity down to 10 −14 branching ratio. We constructed a prototype detector with an active volume of 69 l to demonstrate the performance of the proposed detector for high-energy gamma rays of around 50 MeV. After a test of the cryogenic system for the prototype detector, we have begun studies with the prototype using a gamma-beam up to 40 MeV from the laser Compton backscattering facility at the TERAS electron storage ring of the National Institute of Advanced Industrial Science and Technology (AIST).
Published: 2003

25. R&D work on a liquid-xenon photon detector for the μ→eγ experiment at PSI

Author: K. Terasawa, Masaki Yamashita, S. Suzuki, A. Maki, Toshinori Mori, Tadayoshi Doke, Katsuyu Kasami, Satoshi Mihara, Hajime Nishiguchi, T. Miyazawa, J. Yashima, S. Orito, Tetsuro Mashimo, Tomiyoshi Haruyama, Ryu Sawada, K. Ozone, Satoshi Tanaka, and Wataru Ootani
Subjects: Physics, Nuclear and High Energy Physics, Scintillation, Photomultiplier, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Gamma ray, chemistry.chemical_element, Particle detector, Nuclear physics, Xenon, chemistry, Scintillation counter, High Energy Physics::Experiment, Energy source, Instrumentation
Abstract: We are developing a new type of photon detector for an experiment to search for muons decaying into positrons and gamma rays. The detector utilizes liquid xenon as a scintillation material. The scintillation light emitted in liquid xenon is directly observed by photomultipliers (PMTs) located in the liquid without the use of a transmission window. In order to study the detector response, we have constructed a prototype with an active volume of about 70 l surrounded by 228 PMTs. For studying the detector response we conducted electron and gamma beam tests together with detector calibration using alpha sources and cosmic-ray events. In this article we describe preliminary results obtained in these tests.
Published: 2003

26. A measurement of the τ−→μ−ν̄μντ branching ratio

Author: G Abbiendi, C Ainsley, P.F Åkesson, G Alexander, J Allison, P Amaral, G Anagnostou, K.J Anderson, S Arcelli, S Asai, D Axen, G Azuelos, I Bailey, E Barberio, R.J Barlow, R.J Batley, P Bechtle, T Behnke, K.W Bell, P.J Bell, G Bella, A Bellerive, G Benelli, S Bethke, O Biebel, I.J Bloodworth, O Boeriu, P Bock, D Bonacorsi, M Boutemeur, S Braibant, L Brigliadori, R.M Brown, K Buesser, H.J Burckhart, S Campana, R.K Carnegie, B Caron, A.A Carter, J.R Carter, C.Y Chang, D.G Charlton, A Csilling, M Cuffiani, S Dado, S Dallison, A De Roeck, E.A De Wolf, K Desch, B Dienes, M Donkers, J Dubbert, E Duchovni, G Duckeck, I.P Duerdoth, E Elfgren, E Etzion, F Fabbri, L Feld, P Ferrari, F Fiedler, I Fleck, M Ford, A Frey, A Fürtjes, P Gagnon, J.W Gary, G Gaycken, C Geich-Gimbel, G Giacomelli, P Giacomelli, M Giunta, J Goldberg, E Gross, J Grunhaus, M Gruwé, P.O Günther, A Gupta, C Hajdu, M Hamann, G.G Hanson, K Harder, A Harel, M Harin-Dirac, M Hauschild, J Hauschildt, C.M Hawkes, R Hawkings, R.J Hemingway, C Hensel, G Herten, R.D Heuer, J.C Hill, K Hoffman, R.J Homer, D Horváth, R Howard, P Igo-Kemenes, K Ishii, H Jeremie, P Jovanovic, T.R Junk, N Kanaya, J Kanzaki, G Karapetian, D Karlen, V Kartvelishvili, K Kawagoe, T Kawamoto, R.K Keeler, R.G Kellogg, B.W Kennedy, D.H Kim, K Klein, A Klier, S Kluth, T Kobayashi, M Kobel, S Komamiya, L Kormos, T Krämer, T Kress, P Krieger, J von Krogh, D Krop, K Kruger, T Kuhl, M Kupper, G.D Lafferty, H Landsman, D Lanske, J.G Layter, A Leins, D Lellouch, L Levinson, J Lillich, S.L Lloyd, F.K Loebinger, J Lu, J Ludwig, A Macpherson, W Mader, S Marcellini, T.E Marchant, A.J Martin, J.P Martin, G Masetti, T Mashimo, W.J McDonald, J McKenna, T.J McMahon, R.A McPherson, F Meijers, P Mendez-Lorenzo, W Menges, F.S Merritt, H Mes, A Michelini, S Mihara, G Mikenberg, D.J Miller, S Moed, W Mohr, T Mori, A Mutter, K Nagai, I Nakamura, H.A Neal, R Nisius, S.W O'Neale, A Oh, A Okpara, M.J Oreglia, S Orito, C Pahl, G Pásztor, J.R Pater, G.N Patrick, J.E Pilcher, J Pinfold, D.E Plane, B Poli, J Polok, O Pooth, M Przybycień, A Quadt, K Rabbertz, C Rembser, P Renkel, H Rick, J.M Roney, S Rosati, Y Rozen, K Runge, K Sachs, T Saeki, O Sahr, E.K.G Sarkisyan, A.D Schaile, O Schaile, P Scharff-Hansen, J Schieck, T Schörner-Sadenius, M Schröder, M Schumacher, C Schwick, W.G Scott, R Seuster, T.G Shears, B.C Shen, P Sherwood, G Siroli, A Skuja, A.M Smith, R Sobie, S Söldner-Rembold, F Spano, A Stahl, K Stephens, D Strom, R Ströhmer, S Tarem, M Tasevsky, R.J Taylor, R Teuscher, M.A Thomson, E Torrence, D Toya, P Tran, T Trefzger, A Tricoli, I Trigger, Z Trócsányi, E Tsur, M.F Turner-Watson, I Ueda, B Ujvári, B Vachon, C.F Vollmer, P Vannerem, M Verzocchi, H Voss, J Vossebeld, D Waller, C.P Ward, D.R Ward, P.M Watkins, A.T Watson, N.K Watson, P.S Wells, T Wengler, N Wermes, D Wetterling, G.W Wilson, J.A Wilson, G Wolf, T.R Wyatt, S Yamashita, D Zer-Zion, L Zivkovic, J Letts, P Mättig, and OPAL Collaboration
Subjects: Physics, Coupling constant, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, 01 natural sciences, Nuclear physics, 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, 010306 general physics, Lepton, Minimal Supersymmetric Standard Model
Abstract: The tau -> mu nu nu branching ratio has been measured using data collected from 1990 to 1995 by the OPAL detector at the LEP collider. The resulting value of B(tau -> mu nu nu) = 0.1734 +- 0.0009(stat) +- 0.0006(syst) has been used in conjunction with other OPAL measurements to test lepton universality, yielding the coupling constant ratios gmu/ge=1.0005+-0.0044 and gt/ge=1.0031+-0.0048, in good agreement with the Standard Model prediction of unity. A value for the Michel parameter eta = 0.004 +- 0.037 has also been determined and used to find a limit for the mass of the charged Higgs boson mH+- > 1.25 tan beta, in the Minimal Supersymmetric Standard Model.
Published: 2003

27. Search for invisibly decaying Higgs bosons in e+ e- ---> Z0 h0 production at s**(1/2) = 183-GeV - 209-GeV

Author: G. ABBIENDI, C. AINSLEY, P. F. AKESSON, G. ALEXANDER, G. ANAGNOSTOU, K. J. ANDERSON, S. ASAI, D. AXEN, I. BAILEY, E. BARBERIO, T. BARILLARI, R. J. BARLOW, R. J. BATLEY, P. BECHTLE, T. BEHNKE, KENNETH WATSON BELL, P. J. BELL, G. BELLA, A. BELLERIVE, G. BENELLI, S. BETHKE, O. BIEBEL, O. BOERIU, P. BOCK, M. BOUTEMEUR, ROBERT M. BROWN, H. J. BURCKHART, S. CAMPANA, R. K. CARNEGIE, A. A. CARTER, J. R. CARTER, C. Y. CHANG, D. G. CHARLTON, C. CIOCCA, A. CSILLING, S. DADO, A. DE ROECK, E. A. DE WOLF, K. DESCH, B. DIENES, J. DUBBERT, E. DUCHOVNI, G. DUCKECK, I. P. DUERDOTH, E. ETZION, F. FABBRI, P. FERRARI, F. FIEDLER, I. FLECK, M. FORD, A. FREY, P. GAGNON, JOHN WILLIAM GARY, C. GEICH GIMBEL, P. GIACOMELLI, MARINA GIUNTA, J. GOLDBERG, E. GROSS, J. GRUNHAUS, M. GRUWE, A. GUPTA, C. HAJDU, M. HAMANN, G. G. HANSON, A. HAREL, M. HAUSCHILD, C. M. HAWKES, R. HAWKINGS, G. HERTEN, R. D. HEUER, J. C. HILL, D. HORVATH, P. IGO KEMENES, K. ISHII, H. JEREMIE, P. JOVANOVIC, T. R. JUNK, J. KANZAKI, D. KARLEN, K. KAWAGOE, T. KAWAMOTO, R. K. KEELER, R. G. KELLOGG, B. W. KENNEDY, S. KLUTH, T. KOBAYASHI, M. KOBEL, S. KOMAMIYA, T. KRAMER, A. KRASZNAHORKAY, J.R., P. KRIEGER, J. VON KROGH, T. KUHL, M. KUPPER, G. D. LAFFERTY, H. LANDSMAN, D. LANSKE, D. LELLOUCH, J. LETTSO, L. LEVINSON, J. LILLICH, S. L. LLOYD, F. K. LOEBINGER, J. LU, A. LUDWIG, J. LUDWIG, W. MADER, S. MARCELLINI, A. J. MARTIN, T. MASHIMO, PETER MATTIG, J. MCKENNA, R. A. MCPHERSON, F. MEIJERS, W. MENGES, F. S. MERRITT, H. MES, N. MEYER, A. MICHELINI, S. MIHARA, G. MIKENBERG, D. J. MILLER, W. MOHR, T. MORI, A. MUTTER, K. NAGAI, I. NAKAMURA, H. NANJO, H. A. NEAL, S. W. O'NEALE, A. OH, M. J. OREGLIA, S. ORITO, C. PAHL, G. PASZTOR, J. R. PATER, J. E. PILCHER, J. PINFOLD, D. E. PLANE, O. POOTH, M. PRZYBYCIEN, A. QUADT, K. RABBERTZ, C. REMBSER, P. RENKEL, J. M. RONEY, Y. ROZEN, K. RUNGE, K. SACHS, T. SAEKI, E. K. G. SARKISYAN, A. D. SCHAILE, O. SCHAILE, P. SCHARFF HANSEN, J. SCHIECK, T. SCHORNER SADENIUS, M. SCHRODER, M. SCHUMACHER, R. SEUSTER, T. G. SHEARS, B. C. SHEN, P. SHERWOOD, A. SKUJA, A. M. SMITH, R. SOBIE, S. SOLDNER REMBOLD, F. SPANO, A. STAHL, DAVID M. STROM, R. STROHMER, S. TAREM, M. TASEVSKY, R. TEUSCHER, M. A. THOMSON, E. TORRENCE, D. TOYA, I. TRIGGER, Z. TROCSANYI, E. TSUR, M. F. TURNER WATSON, I. UEDA, B. UJVARI, C. F. VOLLMER, P. VANNEREM, R. VERTESI, M. VERZOCCHI, H. VOSS, J. VOSSEBELD, C. P. WARD, D. R. WARD, P. M. WATKINS, A. T. WATSON, N. K. WATSON, P. S. WELLS, T. WENGLER, N. WERMES, G. W. WILSON, J. A. WILSON, G. WOLF, T. R. WYATT, S. YAMASHITA, D. ZER ZION, LIDIJA ZIVKOVIC, BRAIBANT, SYLVIE, CAPILUPPI, PAOLO, CUFFIANI, MARCO, GIACOMELLI, GIORGIO MARIA, ROSSI, ANTONIO MARIA, G. ABBIENDI, C. AINSLEY, P.F. AKESSON, G. ALEXANDER, G. ANAGNOSTOU, K.J. ANDERSON, S. ASAI, D. AXEN, I. BAILEY, E. BARBERIO, T. BARILLARI, R.J. BARLOW, R.J. BATLEY, P. BECHTLE, T. BEHNKE, KENNETH WATSON BELL, P.J. BELL, G. BELLA, A. BELLERIVE, G. BENELLI, S. BETHKE, O. BIEBEL, O. BOERIU, P. BOCK, M. BOUTEMEUR, S. BRAIBANT, ROBERT M. BROWN, H.J. BURCKHART, S. CAMPANA, P. CAPILUPPI, R.K. CARNEGIE, A.A. CARTER, J.R. CARTER, C.Y. CHANG, D.G. CHARLTON, C. CIOCCA, A. CSILLING, M. CUFFIANI, S. DADO, A. DE ROECK, E.A. DE WOLF, K. DESCH, B. DIENES, J. DUBBERT, E. DUCHOVNI, G. DUCKECK, I.P. DUERDOTH, E. ETZION, F. FABBRI, P. FERRARI, F. FIEDLER, I. FLECK, M. FORD, A. FREY, P. GAGNON, JOHN WILLIAM GARY, C. GEICH-GIMBEL, G. GIACOMELLI, P. GIACOMELLI, MARINA GIUNTA, J. GOLDBERG, E. GROSS, J. GRUNHAUS, M. GRUWE, A. GUPTA, C. HAJDU, M. HAMANN, G.G. HANSON, A. HAREL, M. HAUSCHILD, C.M. HAWKES, R. HAWKINGS, G. HERTEN, R.D. HEUER, J.C. HILL, D. HORVATH, P. IGO-KEMENES, K. ISHII, H. JEREMIE, P. JOVANOVIC, T.R. JUNK, J. KANZAKI, D. KARLEN, K. KAWAGOE, T. KAWAMOTO, R.K. KEELER, R.G. KELLOGG, B.W. KENNEDY, S. KLUTH, T. KOBAYASHI, M. KOBEL, S. KOMAMIYA, T. KRAMER, A. KRASZNAHORKAY, JR., P. KRIEGER, J. VON KROGH, T. KUHL, M. KUPPER, G.D. LAFFERTY, H. LANDSMAN, D. LANSKE, D. LELLOUCH, J. LETTSO, L. LEVINSON, J. LILLICH, S.L. LLOYD, F.K. LOEBINGER, J. LU, A. LUDWIG, J. LUDWIG, W. MADER, S. MARCELLINI, A.J. MARTIN, T. MASHIMO, PETER MATTIG, J. MCKENNA, R.A. MCPHERSON, F. MEIJERS, W. MENGES, F.S. MERRITT, H. MES, N. MEYER, A. MICHELINI, S. MIHARA, G. MIKENBERG, D.J. MILLER, W. MOHR, T. MORI, A. MUTTER, K. NAGAI, I. NAKAMURA, H. NANJO, H.A. NEAL, S.W. O'NEALE, A. OH, M.J. OREGLIA, S. ORITO, C. PAHL, G. PASZTOR, J.R. PATER, J.E. PILCHER, J. PINFOLD, D.E. PLANE, O. POOTH, M. PRZYBYCIEN, A. QUADT, K. RABBERTZ, C. REMBSER, P. RENKEL, J.M. RONEY, A.M. ROSSI, Y. ROZEN, K. RUNGE, K. SACHS, T. SAEKI, E.K.G. SARKISYAN, A.D. SCHAILE, O. SCHAILE, P. SCHARFF-HANSEN, J. SCHIECK, T. SCHORNER-SADENIUS, M. SCHRODER, M. SCHUMACHER, R. SEUSTER, T.G. SHEARS, B.C. SHEN, P. SHERWOOD, A. SKUJA, A.M. SMITH, R. SOBIE, S. SOLDNER-REMBOLD, F. SPANO, A. STAHL, DAVID M. STROM, R. STROHMER, S. TAREM, M. TASEVSKY, R. TEUSCHER, M.A. THOMSON, E. TORRENCE, D. TOYA, I. TRIGGER, Z. TROCSANYI, E. TSUR, M.F. TURNER-WATSON, I. UEDA, B. UJVARI, C.F. VOLLMER, P. VANNEREM, R. VERTESI, M. VERZOCCHI, H. VOSS, J. VOSSEBELD, C.P. WARD, D.R. WARD, P.M. WATKINS, A.T. WATSON, N.K. WATSON, P.S. WELLS, T. WENGLER, N. WERMES, G.W. WILSON, J.A. WILSON, G. WOLF, T.R. WYATT, S. YAMASHITA, D. ZER-ZION, and LIDIJA ZIVKOVIC
Published: 2010

28. Measurement of low-energy antiproton detection efficiency in BESS below 1

Author: Y. Shikaze, M. Fujikawa, Y. Makida, H. Fuke, T. Sanuki, Tetsuya Yoshida, K. Abe, Jun-ichi Suzuki, Mitsuaki Nozaki, K. Izumi, Hironori Matsumoto, Nagataka Matsui, Makoto Sasaki, T. Sonoda, Yoichi Asaoka, Koji Yoshimura, Akira Yamamoto, Kenichi Tanaka, Kazuaki Anraku, H. Matsunaga, M. Motoki, Tadashi Maeno, Y. Toki, Sadakazu Haino, and S. Orito
Subjects: Physics, Systematic error, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Spectrometer, High Energy Physics::Phenomenology, Monte Carlo method, FOS: Physical sciences, Flux, Instrumentation and Detectors (physics.ins-det), Nuclear physics, Superconducting solenoid, Antiproton beam, Low energy, Antiproton, Physics::Accelerator Physics, Nuclear Experiment, Instrumentation
Abstract: 著者人数: 25名, Accepted: 2002-02-14, 資料番号: SA1003532000
Published: 2002

29. Development of a liquid Xe photon detector for /spl mu//spl rarr/e/spl gamma/ decay search experiment at PSI

Author: Tetsuro Mashimo, Hajime Nishiguchi, Yoshio Kamiya, K. Ozone, Tadayoshi Doke, S. Suzuki, K. Terasawa, G. Tejima, Satoshi Mihara, S. Orito, Ryu Sawada, Masaki Yamashita, J. Yashima, Takehiko Mori, Wataru Ootani, and K. Yahagi
Subjects: Physics, Nuclear and High Energy Physics, Scintillation, Photomultiplier, Muon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Detector, Alpha-particle spectroscopy, Gamma ray, Scintillator, Nuclear physics, Positron, Nuclear Energy and Engineering, High Energy Physics::Experiment, Electrical and Electronic Engineering
Abstract: We are developing a new type of photon detector for an experiment to search for muons decaying into a positron and gamma ray. Our sensitivity on the branching ratio is expected to reach 10/sup -14/ by use of the world's most intense continuous muon beam at Paul Scherrer Institut (PSI). In this experiment, the photon detector will utilize liquid Xe as a scintillation material because of its fast response, large light yield, and high density. The scintillation light emitted in liquid Xe will be directly observed by photomultipliers (PMTs) located in the liquid without the use of a transmission window. In order to study the detector response to gamma rays, we have constructed a prototype with an active volume of 2.3 /spl times/ 10/sup 3/ cm/sup 3/ surrounded by 32 PMTS. The PMT is a new development enabling operation at temperatures as low as liquid Xe (165 K). Energy, position, and timing resolutions have been evaluated using gamma-ray sources ranging from 320 keV to 1835 keV. The performance of the prototype is presented.
Published: 2002

30. Search for leptoquarks in electron–photon scattering at up to 209 GeV at LEP

Author: G. Abbiendi, C. Ainsley, P.F. Åkesson, G. Alexander, J. Allison, G. Anagnostou, K.J. Anderson, S. Arcelli, S. Asai, D. Axen, G. Azuelos, I. Bailey, E. Barberio, R.J. Barlow, R.J. Batley, P. Bechtle, T. Behnke, K.W. Bell, P.J. Bell, G. Bella, A. Bellerive, G. Benelli, S. Bethke, O. Biebel, I.J. Bloodworth, O. Boeriu, P. Bock, J. Böhme, D. Bonacorsi, M. Boutemeur, S. Braibant, L. Brigliadori, R.M. Brown, H.J. Burckhart, J. Cammin, S. Campana, R.K. Carnegie, B. Caron, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, P.E.L. Clarke, E. Clay, I. Cohen, J. Couchman, A. Csilling, M. Cuffiani, S. Dado, G.M. Dallavalle, S. Dallison, A. De Roeck, E.A. De Wolf, P. Dervan, K. Desch, B. Dienes, M. Donkers, J. Dubbert, E. Duchovni, G. Duckeck, I.P. Duerdoth, E. Etzion, F. Fabbri, L. Feld, P. Ferrari, F. Fiedler, I. Fleck, M. Ford, A. Frey, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, M. Giunta, J. Goldberg, K. Graham, E. Gross, J. Grunhaus, M. Gruwé, P.O. Günther, A. Gupta, C. Hajdu, M. Hamann, G.G. Hanson, K. Harder, A. Harel, M. Harin-Dirac, M. Hauschild, J. Hauschildt, C.M. Hawkes, R. Hawkings, R.J. Hemingway, C. Hensel, G. Herten, R.D. Heuer, J.C. Hill, K. Hoffman, R.J. Homer, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, K. Ishii, A. Jawahery, H. Jeremie, C.R. Jones, P. Jovanovic, T.R. Junk, N. Kanaya, J. Kanzaki, G. Karapetian, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, D.H. Kim, K. Klein, A. Klier, S. Kluth, T. Kobayashi, M. Kobel, T.P. Kokott, S. Komamiya, L. Kormos, R.V. Kowalewski, T. Krämer, T. Kress, P. Krieger, J. von Krogh, D. Krop, T. Kuhl, M. Kupper, P. Kyberd, G.D. Lafferty, H. Landsman, D. Lanske, I. Lawson, J.G. Layter, A. Leins, D. Lellouch, J. Letts, L. Levinson, J. Lillich, C. Littlewood, S.L. Lloyd, F.K. Loebinger, J. Lu, J. Ludwig, A. Macchiolo, A. Macpherson, W. Mader, S. Marcellini, T.E. Marchant, A.J. Martin, J.P. Martin, G. Martinez, G. Masetti, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, T.J. McMahon, R.A. McPherson, F. Meijers, P. Mendez-Lorenzo, W. Menges, F.S. Merritt, H. Mes, A. Michelini, S. Mihara, G. Mikenberg, D.J. Miller, S. Moed, W. Mohr, T. Mori, A. Mutter, K. Nagai, I. Nakamura, H.A. Neal, R. Nisius, S.W. O'Neale, A. Oh, A. Okpara, M.J. Oreglia, S. Orito, C. Pahl, G. Pásztor, J.R. Pater, G.N. Patrick, J.E. Pilcher, J. Pinfold, D.E. Plane, B. Poli, J. Polok, O. Pooth, A. Quadt, K. Rabbertz, C. Rembser, P. Renkel, H. Rick, N. Rodning, J.M. Roney, S. Rosati, K. Roscoe, Y. Rozen, K. Runge, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, E.K.G. Sarkisyan, A.D. Schaile, O. Schaile, P. Scharff-Hansen, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, F. Spano, M. Sproston, A. Stahl, K. Stephens, D. Strom, R. Ströhmer, B. Surrow, S. Tarem, M. Tasevsky, R.J. Taylor, R. Teuscher, J. Thomas, M.A. Thomson, E. Torrence, D. Toya, T. Trefzger, A. Tricoli, I. Trigger, Z. Trócsányi, E. Tsur, M.F. Turner-Watson, I. Ueda, B. Ujvári, B. Vachon, C.F. Vollmer, P. Vannerem, M. Verzocchi, H. Voss, J. Vossebeld, D. Waller, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, T. Wengler, N. Wermes, D. Wetterling, G.W. Wilson, J.A. Wilson, T.R. Wyatt, S. Yamashita, V. Zacek, and D. Zer-Zion
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, Scalar (mathematics), Supersymmetry, Electron, 01 natural sciences, First generation, Standard Model, 0103 physical sciences, High Energy Physics::Experiment, Leptoquark, 010306 general physics, Photon scattering
Abstract: Searches for first generation scalar and vector leptoquarks, and for squarks in R-parity violating SUSY models with the direct decay of the squark into Standard Model particles, have been performed using e+e- collisions collected with the OPAL detector at LEP at e+e- centre-of-mass energies between 189 and 209 GeV. No excess of events is found over the expectation from Standard Model background processes. Limits are computed on the leptoquark couplings for different values of the branching ratio to electron-quark final states.
Published: 2002

31. Sigma-antihyperon correlations in Z0 decay and investigation of the baryon production mechanism

Author: G. W. Wilson, M. Schumacher, M. Hauschild, Teresa Barillari, W. Menges, Otmar Biebel, E. A. De Wolf, Oliver Pooth, J. Grunhaus, L. Zivkovic, B. Dienes, J. A. McKenna, P. Mättig, Shoji Asai, Norbert Wermes, T. Kawamoto, S. Orito, M. Dallavalle, H. Landsman, E. L. Barberio, R. G. Kellogg, Attila Krasznahorkay, H. Mes, I. P. Duerdoth, J. Lillich, J. M. Roney, B. W. Kennedy, P. Jovanovic, Peter Krieger, A. J. Martin, A. Harel, Thorsten Wengler, Dave Charlton, Csaba Hajdu, Stefano Marcellini, James Letts, N. K. Watson, Daniel Lellouch, Guenter Duckeck, Ikuo Ueda, D. M. Strom, D. J. Miller, J. Lu, D. Axen, Christoph Geich-Gimbel, Oana Elena Vickey Boeriu, Koichi Nagai, K. Ishii, H. Jeremie, Takehiko Mori, G. Mikenberg, W. Mader, Sachio Komamiya, M. Gruwe, F. Spano, W. Mohr, Peter Sherwood, Tara Shears, R. J. Batley, Gabriele Benelli, Robert McPherson, P. Scharff-Hansen, R. D. Heuer, C. Ainsley, M. J. Oreglia, S. Braibant, Gordon H. Hanson, E. Tsur, C. M. Hawkes, O. Schaile, C. F. Vollmer, Richard Teuscher, J. Ludwig, K. Runge, P. Bock, T. Saeki, T. Kuhl, A. M. Rossi, M. A. Thomson, Rolf Seuster, Isabel Marian Trigger, K. W. Bell, Yoram Rozen, E. K. U. Gross, H. Voss, D. Zer-Zion, A. M. Smith, Kiyotomo Kawagoe, Gregor Herten, Gideon Bella, H. J. Burckhart, J. C. Hill, Jochen Schieck, R. J. Barlow, J. Goldberg, Junichi Kanzaki, F. K. Loebinger, Fabrizio Fabbri, A. Frey, Satoru Yamashita, Matthias Schröder, Tobias Kramer, B. C. Shen, Ivor Fleck, Andris Skuja, Joleen Pater, Balazs Ujvari, J. E. Pilcher, Edward K. G. Sarkisyan, D. Toya, M. Boutemeur, F. S. Merritt, Siegfried Bethke, Tetsuro Mashimo, M. F. Turner-Watson, H. A. Neal, A. Mutter, T. Schörner-Sadenius, I. Nakamura, N. Meyer, S. Campana, J. W. Gary, M. Kupper, T. Behnke, T. R. Junk, James Pinfold, A. Quadt, P. S. Wells, Alexander Oh, Terry Richard Wyatt, A. T. Watson, Marco Cuffiani, Claudia Ciocca, P. Gagnon, M. Hamann, K. Sachs, J. R. Carter, D. Lanske, Philip Bechtle, Marek Tasevsky, Christoph Rembser, C. Pahl, R. J. Sobie, G. D. Lafferty, Joost Vossebeld, Klaus Desch, Erez Etzion, R. K. Keeler, Zoltan Laszlo Trocsanyi, P. J. Bell, Stefan Kluth, P. M. Watkins, Shlomit Tarem, P. Renkel, M. Giunta, Dezso Horvath, Gunter Wolf, D. Karlen, Gideon Alexander, Paolo Capiluppi, H. Nanjo, P. Igo-Kemenes, M. Przybycień, Ehud Duchovni, A. Michelini, A. A. Carter, T. Kobayashi, A. Ludwig, M. Verzocchi, P. F. Åkesson, Giovanni Abbiendi, Klaus Rabbertz, Stephen Lloyd, J. Dubbert, Robert Vertesi, R. K. Carnegie, J. A. Wilson, M. Ford, J. von Krogh, R. J. Hawkings, D. Wetterling, E. Torrence, A. Gupta, Alain Bellerive, A. Csilling, G. Anagnostou, Pamela Ferrari, D. E. Plane, Shlomo Dado, G. Giacomelli, A. De Roeck, M. Kobel, Frans Meijers, R. M. Brown, Lorne Levinson, A. D. Schaile, Paolo Giacomelli, Gabriella Pasztor, P. Vannerem, I. R. Bailey, C. P. Ward, S. Söldner-Rembold, Achim Stahl, C. Y. Chang, Raimund Ströhmer, S. W. O'Neale, K. J. Anderson, D. R. Ward, Satoshi Mihara, Frank Fiedler, OPAL Collaboration, G. ABBIENDI, C. AINSLEY, P. F. ÅKESSON, G. ALEXANDER, G. ANAGNOSTOU, K. J. ANDERSON, S. ASAI, D. AXEN, I. BAILEY, E. BARBERIO, T. BARILLARI, R. J. BARLOW, R. J. BATLEY, P. BECHTLE, T. BEHNKE, K. W. BELL, P. J. BELL, G. BELLA, A. BELLERIVE, G. BENELLI, S. BETHKE, O. BIEBEL, O. BOERIU, P. BOCK, M. BOUTEMEUR, S. BRAIBANT, R. M. BROWN, H. J. BURCKHAR, S. CAMPANA, P. CAPILUPPI, R. K. CARNEGIE, A. A. CARTER, J. R. CARTER, C. Y. CHANG, D. G. CHARLTON, C. CIOCCA, A. CSILLING, M. CUFFIANI, S. DADO, M. DALLAVALLE, A. DE ROECK, E. A. DE WOLF, K. DESCH, B. DIENES, J. DUBBERT, E. DUCHOVNI, G. DUCKECK, I. P. DUERDOTH, E. ETZION, F. FABBRI, P. FERRARI, F. FIEDLER, I. FLECK, M. FORD, A. FREY, P. GAGNON, J. W. GARY, C. GEICH-GIMBEL, G. GIACOMELLI, P. GIACOMELLI, M. GIUNTA, J. GOLDBERG, E. GROSS, J. GRUNHAUS, M. GRUWÉ, A. GUPT, C. HAJDU, M. HAMANN, G. G. HANSON, A. HAREL, M. HAUSCHILD, C. M. HAWKES, R. HAWKINGS, G. HERTEN, R. D. HEUER, J. C. HILL, D. HORVÁTH, P. IGO-KEMENES, K. ISHII, H. JEREMIE, P. JOVANOVIC, T. R. JUNK, J. KANZAKI, D. KARLEN, K. KAWAGOE, T. KAWAMOTO, R. K. KEELER, R. G. KELLOGG, B. W. KENNEDY, S. KLUTH, T. KOBAYASHI, M. KOBEL, S. KOMAMIYA, T. KRÄMER, A. KRASZNAHORKAY JR., P. KRIEGER, J. VON KROGH, T. KUHL, M. KUPPER, G. D. LAFFERTY, H. LANDSMAN, D. LANSKE, D. LELLOUCH, J. LETTS, L. LEVINSON, J. LILLICH, S. L. LLOYD, F. K. LOEBINGER, J. LU, A. LUDWIG, J. LUDWIG, W. MADER, S. MARCELLINI, A. J. MARTIN, T. MASHIMO, P. MÄTTIG, J. MCKENNA, R. A. MCPHERSON, F. MEIJERS, W. MENGES, F. S. MERRITT, H. MES, N. MEYER, A. MICHELINI, S. MIHARA, G. MIKENBERG, D. J. MILLER, W. MOHR, T. MORI, A. MUTTER, K. NAGAI, I. NAKAMURA, H. NANJO, H. A. NEAL, S. W. O’NEALE, A. OH, M. J. OREGLIA, S. ORITO, C. PAHL, G. PÁSZTOR, J. R. PATER, J. E. PILCHER, J. PINFOLD, D. E. PLANE, O. POOTH, M. PRZYBYCIEń, A. QUADT, K. RABBERTZ, C. REMBSER, P. RENKEL, J. M. RONEY, A. M. ROSSI, Y. ROZEN, K. RUNGE, K. SACHS, T. SAEKI, E. K. G. SARKISYAN, A. D. SCHAILE, O. SCHAILE, P. SCHARFF-HANSEN, J. SCHIECK, T. SCHÖRNER-SADENIUS, M. SCHRÖDER, M. SCHUMACHER, R. SEUSTER, T. G. SHEARS, B. C. SHEN, P. SHERWOOD, A. SKUJA, A. M. SMITH, R. SOBIE, S. SÖLDNER-REMBOLD, F. SPANO, A. STAHL, D. STROM, R. STRÖHMER, S. TAREM, M. TASEVSKY, R. TEUSCHER, M. A. THOMSON, E. TORRENCE, D. TOYA, I. TRIGGER, Z. TRÓCSÁNYI, E. TSUR, M. F. TURNER-WATSON, I. UEDA, B. UJVÁRI, C. F. VOLLMER, P. VANNEREM, R. VÉRTESI, M. VERZOCCHI, H. VOSS, J. VOSSEBELD, C. P. WARD, D. R. WARD, P. M. WATKINS, A. T. WATSON, N. K. WATSON, P. S. WELLS, T. WENGLER, N. WERMES, D. WETTERLING, G. W. WILSON, J. A. WILSON, G. WOLF, T. R. WYATT, S. YAMASHITA, D. ZER-ZION, and L. ZIVKOVIC
Subjects: Particle physics, Physics and Astronomy (miscellaneous), Nuclear Theory, FOS: Physical sciences, Fizikai tudományok, Context (language use), Lambda, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Természettudományok, 0103 physical sciences, ddc:530, Rapidity, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hyperon, 3. Good health, Hadronization, Baryon, Diquark, High Energy Physics::Experiment, Baryon number, Particle Physics - Experiment
Abstract: Data collected around sqrt{s}=91 GeV by the OPAL experiment at the LEP e+e- collider are used to study the mechanism of baryon formation. As the signature, the fraction of Sigma-hyperons whose baryon number is compensated by the production of a Sigma-, Lambda or Xi- antihyperon is determined. The method relies entirely on quantum number correlations of the baryons, and not rapidity correlations, making it more model independent than previous studies. The diquark fragmentation model without the popcorn mechanism is strongly disfavored with a significance of 3.8 standard deviations including systematic uncertainties. It is shown that previous studies of the popcorn mechanism are not conclusive if parameter uncertainties are considered., Comment: No of pages 31 - No of figures 7
Published: 2009
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32. Measurement of the branching ratio for →τ decays

Author: J. Letts, A. Leins, Shlomo Dado, K. Graham, Tara Shears, P. Gagnon, D. Toya, A. W. Lloyd, C. Pahl, Paolo Giacomelli, M. Hauschild, Giora Mikenberg, G. D. Lafferty, J. Allison, Zoltan Laszlo Trocsanyi, M. Harin-Dirac, C. H. Shepherd-Themistocleous, Kiyotomo Kawagoe, Dong Hee Kim, R. J. Homer, I. J. Bloodworth, A. K. Honma, O. Runolfsson, Gideon Bella, Claudio Grandi, J. S. White, Claudia Schmitt, W. J. McDonald, B. C. Shen, David Futyan, Yoram Rozen, H. J. Burckhart, D. J. Miller, M. Donkers, Naoko Kanaya, Siegfried Bethke, Alexander Oh, S. Yamashita, P. Igo-Kemenes, M. A. Thomson, P. F. Åkesson, D. Lanske, G. W. Wilson, Junichi Kanzaki, P. G. Estabrooks, R. K. Keeler, G. Gaycken, Gregor Herten, W. G. Scott, J. Polok, D. Karlen, T. Trefzger, S. Spagnolo, K. Ishii, H. Jeremie, S. D. Talbot, C. Hensel, Daniel Lellouch, I. Nakamura, Richard J. K. Taylor, T. Behnke, Takehiko Mori, C. R. Jones, A. Okpara, J. W. Gary, Arnulf Quadt, P. M. Watkins, C. F. Vollmer, T. R. Wyatt, R. J. Barlow, H. Landsman, J. E. Pilcher, Erez Etzion, K. R. Hossain, P. Mättig, D. Zer-Zion, O. Schaile, M. Verzocchi, A. J. Martin, Christoph Geich-Gimbel, P. Mendez-Lorenzo, Thorsten Wengler, Stefan Kluth, Shlomit Tarem, B. Caron, D. Axen, P. Renkel, A. Jawahery, Oana Elena Vickey Boeriu, D. Glenzinski, Marek Tasevsky, F. G. Oakham, A. D. Schaile, Gabriella Pasztor, Dezso Horvath, M. J. Losty, E. L. Barberio, F. Spano, Peter Sherwood, A. Macchiolo, J. Couchman, W. Mader, F. Odorici, T. Kress, B. Surrow, A. A. Carter, P. Vannerem, G. A. Snow, C. P. Ward, J. Ludwig, K. Runge, P. Bock, G. Benelli, L. Brigliadori, Shoji Asai, E. A. De Wolf, S. Rosati, Sachio Komamiya, Giovanni Abbiendi, M. J. Oreglia, A. Csilling, S. Söldner-Rembold, Dave Charlton, J. G. Layter, S. W. O'Neale, K. Hoffman, A. Harel, S.J. Dallison, T. P. Kokott, D. Waller, P. O. Günther, T. Saeki, Rolf Seuster, M. Gruwé, G. N. Patrick, P. E.L. Clarke, Ikuo Ueda, D. M. Strom, K. J. Anderson, V. Kartvelishvili, J. P. Martin, T. Kuhl, R. D. Heuer, Richard Nisius, W. Menges, Achim Stahl, J. Lu, Satoshi Mihara, Guenter Duckeck, H. Rick, C. Y. Chang, Marco Cuffiani, M. Ford, G. Anagnostou, Katja Klein, L. Stumpf, H. Voss, H. Mes, I. P. Duerdoth, S. Braibant, K. Sachs, J. R. Carter, Norbert Wermes, Sherry Towers, T. Kawamoto, G. G. Hanson, N. K. Watson, G. Giacomelli, J. Grunhaus, S. Orito, G. P. Siroli, I. Lawson, Frank Fiedler, A. De Roeck, M. Kobel, Christoph Schwick, J. Böhme, M. S. Dixit, T. R. Junk, Raimund Ströhmer, Richard Teuscher, Frans Meijers, Juergen Thomas, Matthias Schröder, P. S. Wells, T. Kämer, C. Ainsley, P. Hüntemeyer, A. T. Watson, Andris Skuja, A. M. Rossi, Georges Azuelos, B. Vachon, O. Sahr, E. Tsur, C. M. Hawkes, R. Liebisch, Isabel Marian Trigger, K. W. Bell, A. Macpherson, R. J. Hemingway, Tetsuro Mashimo, R. Kowalewski, J. C. Hill, J. Lillich, M. F. Turner-Watson, Beatrix Dienes, Paul Kyberd, F. K. Loebinger, B. W. Kennedy, R. J. Sobie, Joost Vossebeld, P. Jovanovic, E. Torrence, Austin Ball, S. Arcelli, Klaus Desch, R. Howard, Peter Krieger, Alessandro Montanari, M. Kupper, K. Stephens, Ivor Fleck, Joleen Pater, Edward K. G. Sarkisyan, A. Klier, H. A. Neal, Alain Bellerive, N. L. Rodning, Thomas E Marchant, C. Littlewood, P. Dervan, B. Poli, P. Scharff-Hansen, A. M. Smith, Daniele Bonacorsi, D. Krop, J. von Krogh, Gideon Alexander, James Pinfold, R. J. Hawkings, Oliver Pooth, D. Wetterling, Paolo Capiluppi, T. J. McMahon, J. Dubbert, R. K. Carnegie, M. Schumacher, Richard Batley, V. Zacek, J. A. Wilson, D. R. Ward, G. Karapetian, R. G. Kellogg, C. Sbarra, Csaba Hajdu, Stefano Marcellini, J. Goldberg, I. Cohen, Christoph Rembser, A. Fürtjes, Lutz Feld, M. Fanti, Ehud Duchovni, M. Boutemeur, F. S. Merritt, J. A. McKenna, A. Michelini, Robert McPherson, T. Kobayashi, Fabrizio Fabbri, A. Frey, J. Cammin, K. Harder, R. M. Brown, Lorne Levinson, G. D. Long, I. R. Bailey, Klaus Rabbertz, Stephen Lloyd, O. Biebel, D. R. Rust, D. E. Plane, G. M. Dallavalle, K. Roscoe, A. Gupta, E. Clay, J. M. Roney, Koichi Nagai, W. Mohr, P. Ferrari, German Martinez, E. K. U. Gross, and M. Sproston
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, Hadron, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Exponential decay, Nuclear Experiment, 010306 general physics
Abstract: Using about 3.9 million hadronic Z decays from e + e − collisions recorded by the OPAL detector at LEP at centre-of-mass energies s ≈M Z , the branching ratio for the decay D − s →τ − ν τ has been measured to be BR ( D − s →τ − ν τ )=(7.0±2.1( stat )±2.0( syst ))%. This result can be used to derive the decay constant of the D − s meson: f D s =(286±44( stat )±41( syst )) MeV .
Published: 2001

33. Measurement of the B0 lifetime and oscillation frequency using →ℓ decays

Author: G. Abbiendi, K. Ackerstaff, C. Ainsley, P.F. Åkesson, G. Alexander, J. Allison, K.J. Anderson, S. Arcelli, S. Asai, S.F. Ashby, D. Axen, G. Azuelos, I. Bailey, A.H. Ball, E. Barberio, R.J. Barlow, S. Baumann, T. Behnke, K.W. Bell, G. Bella, A. Bellerive, G. Benelli, S. Bentvelsen, S. Bethke, O. Biebel, I.J. Bloodworth, O. Boeriu, P. Bock, J. Böhme, D. Bonacorsi, M. Boutemeur, S. Braibant, P. Bright-Thomas, L. Brigliadori, R.M. Brown, H.J. Burckhart, J. Cammin, P. Capiluppi, R.K. Carnegie, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, P.E.L. Clarke, E. Clay, I. Cohen, O.C. Cooke, J. Couchman, C. Couyoumtzelis, R.L. Coxe, A. Csilling, M. Cuffiani, S. Dado, G.M. Dallavalle, S. Dallison, A. de Roeck, E. de Wolf, P. Dervan, K. Desch, B. Dienes, M.S. Dixit, M. Donkers, J. Dubbert, E. Duchovni, G. Duckeck, I.P. Duerdoth, P.G. Estabrooks, E. Etzion, F. Fabbri, M. Fanti, L. Feld, P. Ferrari, F. Fiedler, I. Fleck, M. Ford, A. Frey, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, D. Glenzinski, J. Goldberg, C. Grandi, K. Graham, E. Gross, J. Grunhaus, M. Gruwé, P.O. Günther, C. Hajdu, G.G. Hanson, M. Hansroul, M. Hapke, K. Harder, A. Harel, M. Harin-Dirac, A. Hauke, M. Hauschild, C.M. Hawkes, R. Hawkings, R.J. Hemingway, C. Hensel, G. Herten, R.D. Heuer, J.C. Hill, A. Hocker, K. Hoffman, R.J. Homer, A.K. Honma, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, K. Ishii, F.R. Jacob, A. Jawahery, H. Jeremie, C.R. Jones, P. Jovanovic, T.R. Junk, N. Kanaya, J. Kanzaki, G. Karapetian, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, D.H. Kim, K. Klein, A. Klier, S. Kluth, T. Kobayashi, M. Kobel, T.P. Kokott, S. Komamiya, R.V. Kowalewski, T. Kress, P. Krieger, J. von Krogh, T. Kuhl, M. Kupper, P. Kyberd, G.D. Lafferty, H. Landsman, D. Lanske, I. Lawson, J.G. Layter, A. Leins, D. Lellouch, J. Letts, L. Levinson, R. Liebisch, J. Lillich, B. List, C. Littlewood, A.W. Lloyd, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Lu, J. Ludwig, A. Macchiolo, A. Macpherson, W. Mader, S. Marcellini, T.E. Marchant, A.J. Martin, J.P. Martin, G. Martinez, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, T.J. McMahon, R.A. McPherson, F. Meijers, P. Mendez-Lorenzo, W. Menges, F.S. Merritt, H. Mes, A. Michelini, S. Mihara, G. Mikenberg, D.J. Miller, W. Mohr, A. Montanari, T. Mori, K. Nagai, I. Nakamura, H.A. Neal, R. Nisius, S.W. O'Neale, F.G. Oakham, F. Odorici, H.O. Ogren, A. Oh, A. Okpara, M.J. Oreglia, S. Orito, G. Pásztor, J.R. Pater, G.N. Patrick, J. Patt, P. Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, B. Poli, J. Polok, O. Pooth, M. Przybycień, A. Quadt, C. Rembser, P. Renkel, H. Rick, N. Rodning, J.M. Roney, S. Rosati, K. Roscoe, A.M. Rossi, Y. Rozen, K. Runge, O. Runolfsson, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, P. Scharff-Hansen, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, M. Sproston, A. Stahl, K. Stephens, K. Stoll, D. Strom, R. Ströhmer, L. Stumpf, B. Surrow, S.D. Talbot, S. Tarem, R.J. Taylor, R. Teuscher, M. Thiergen, J. Thomas, M.A. Thomson, E. Torrence, S. Towers, D. Toya, T. Trefzger, I. Trigger, Z. Trócsányi, E. Tsur, M.F. Turner-Watson, I. Ueda, B. Vachon, P. Vannerem, M. Verzocchi, H. Voss, J. Vossebeld, D. Waller, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, T. Wengler, N. Wermes, D. Wetterling, J.S. White, G.W. Wilson, J.A. Wilson, T.R. Wyatt, S. Yamashita, V. Zacek, and D. Zer-Zion
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Oscillation, 0103 physical sciences, Detector, 010306 general physics, 01 natural sciences
Abstract: The lifetime and oscillation frequency of the B0 meson has been measured using B0->D*+l-v decays recorded on the Z0 peak with the OPAL detector at LEP. The D*+ -> D0pi+ decays were reconstructed using an inclusive technique and the production flavour of the B0 mesons was determined using a combination of tags from the rest of the event. The results t_B0 = 1.541 +- 0.028 +- 0.023 ps, Dm_d = 0.497 +- 0.024 +- 0.025 ps-1 were obtained, where in each case the first error is statistical and the second systematic.
Published: 2000

34. First measurement of the inclusive branching ratio of b hadrons to φ mesons in Z decays

Author: G. Abbiendi, K. Ackerstaff, C. Ainsley, P.F. Akesson, G. Alexander, J. Allison, K.J. Anderson, S. Arcelli, S. Asai, S.F. Ashby, D. Axen, G. Azuelos, I. Bailey, A.H. Ball, E. Barberio, R.J. Barlow, S. Baumann, T. Behnke, K.W. Bell, G. Bella, A. Bellerive, S. Bentvelsen, S. Bethke, O. Biebel, I.J. Bloodworth, P. Bock, J. Böhme, O. Boeriu, D. Bonacorsi, M. Boutemeur, S. Braibant, P. Bright-Thomas, L. Brigliadori, R.M. Brown, H.J. Burckhart, J. Cammin, P. Capiluppi, R.K. Carnegie, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, C. Ciocca, P.E.L. Clarke, E. Clay, I. Cohen, O.C. Cooke, J. Couchman, C. Couyoumtzelis, R.L. Coxe, M. Cuffiani, S. Dado, G.M. Dallavalle, S. Dallison, A. de Roeck, P. Dervan, K. Desch, B. Dienes, M.S. Dixit, M. Donkers, J. Dubbert, E. Duchovni, G. Duckeck, I.P. Duerdoth, P.G. Estabrooks, E. Etzion, F. Fabbri, M. Fanti, L. Feld, P. Ferrari, F. Fiedler, I. Fleck, M. Ford, A. Frey, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, D. Glenzinski, J. Goldberg, C. Grandi, K. Graham, E. Gross, J. Grunhaus, M. Gruwé, P.O. Günther, C. Hajdu, G.G. Hanson, M. Hansroul, M. Hapke, K. Harder, A. Harel, C.K. Hargrove, M. Harin-Dirac, A. Hauke, M. Hauschild, C.M. Hawkes, R. Hawkings, R.J. Hemingway, C. Hensel, G. Herten, R.D. Heuer, M.D. Hildreth, J.C. Hill, A. Hocker, K. Hoffman, R.J. Homer, A.K. Honma, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, K. Ishii, F.R. Jacob, A. Jawahery, H. Jeremie, C.R. Jones, P. Jovanovic, T.R. Junk, N. Kanaya, J. Kanzaki, G. Karapetian, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, D.H. Kim, K. Klein, A. Klier, T. Kobayashi, M. Kobel, T.P. Kokott, S. Komamiya, R.V. Kowalewski, T. Kress, P. Krieger, J. von Krogh, T. Kuhl, M. Kupper, P. Kyberd, G.D. Lafferty, H. Landsman, D. Lanske, I. Lawson, J.G. Layter, A. Leins, D. Lellouch, J. Letts, L. Levinson, R. Liebisch, J. Lillich, B. List, C. Littlewood, A.W. Lloyd, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Lu, J. Ludwig, A. Macchiolo, A. Macpherson, W. Mader, M. Mannelli, S. Marcellini, T.E. Marchant, A.J. Martin, J.P. Martin, G. Martinez, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, T.J. McMahon, R.A. McPherson, F. Meijers, P. Mendez-Lorenzo, F.S. Merritt, H. Mes, A. Michelini, S. Mihara, G. Mikenberg, D.J. Miller, W. Mohr, A. Montanari, T. Mori, K. Nagai, I. Nakamura, H.A. Neal, R. Nisius, S.W. O'Neale, F.G. Oakham, F. Odorici, H.O. Ogren, A. Oh, A. Okpara, M.J. Oreglia, S. Orito, G. Pásztor, J.R. Pater, G.N. Patrick, J. Patt, P. Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, B. Poli, J. Polok, O. Przybycień, A. Quadt, C. Rembser, H. Rick, S.A. Robins, N. Rodning, J.M. Roney, S. Rosati, K. Roscoe, A.M. Rossi, Y. Rozen, K. Runge, O. Runolfsson, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, P. Scharff-Hansen, S. Schmitt, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, M. Sproston, A. Stahl, K. Stephens, K. Stoll, D. Strom, R. Ströhmer, B. Surrow, S.D. Talbot, S. Tarem, R.J. Taylor, R. Teuscher, M. Thiergen, J. Thomas, M.A. Thomson, E. Torrence, S. Towers, T. Trefzger, I. Trigger, Z. Trócsányi, E. Tsur, M.F. Turner-Watson, I. Ueda, P. Vannerem, M. Verzocchi, H. Voss, J. Vossebeld, D. Waller, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, T. Wengler, N. Wermes, D. Wetterling, J.S. White, G.W. Wilson, J.A. Wilson, T.R. Wyatt, S. Yamashita, V. Zacek, and D. Zer-Zion
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, Branching fraction, High Energy Physics::Phenomenology, Hadron, Detector, High Energy Physics::Experiment, Nuclear Experiment, Production rate
Abstract: The inclusive production rate of phi mesons from the decay of b hadrons produced in Z0 decays was measured to be Br(b->phi+X) = 0.0282+-0.0013(stat.)+-0.0019(syst.), using data collected by the OPAL detector at LEP.
Published: 2000

35. Measurement of |Vcb| using decays

Author: G. Abbiendi, K. Ackerstaff, P.F. Akesson, G. Alexander, J. Allison, K.J. Anderson, S. Arcelli, S. Asai, S.F. Ashby, D. Axen, G. Azuelos, I. Bailey, A.H. Ball, E. Barberio, R.J. Barlow, J.R. Batley, S. Baumann, T. Behnke, K.W. Bell, G. Bella, A. Bellerive, S. Bentvelsen, S. Bethke, O. Biebel, A. Biguzzi, I.J. Bloodworth, P. Bock, J. Böhme, O. Boeriu, D. Bonacorsi, M. Boutemeur, S. Braibant, P. Bright-Thomas, L. Brigliadori, R.M. Brown, H.J. Burckhart, J. Cammin, P. Capiluppi, R.K. Carnegie, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, D. Chrisman, C. Ciocca, P.E.L. Clarke, E. Clay, I. Cohen, O.C. Cooke, J. Couchman, C. Couyoumtzelis, R.L. Coxe, M. Cuffiani, S. Dado, G.M. Dallavalle, S. Dallison, R. Davis, A. de Roeck, P. Dervan, K. Desch, B. Dienes, M.S. Dixit, M. Donkers, J. Dubbert, E. Duchovni, G. Duckeck, I.P. Duerdoth, P.G. Estabrooks, E. Etzion, F. Fabbri, A. Fanfani, M. Fanti, A.A. Faust, L. Feld, P. Ferrari, F. Fiedler, M. Fierro, I. Fleck, A. Frey, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, D.M. Gingrich, D. Glenzinski, J. Goldberg, W. Gorn, C. Grandi, K. Graham, E. Gross, J. Grunhaus, M. Gruwé, P.O. Günther, C. Hajdu, G.G. Hanson, M. Hansroul, M. Hapke, K. Harder, A. Harel, C.K. Hargrove, M. Harin-Dirac, A. Hauke, M. Hauschild, C.M. Hawkes, R. Hawkings, R.J. Hemingway, C. Hensel, G. Herten, R.D. Heuer, M.D. Hildreth, J.C. Hill, P.R. Hobson, A. Hocker, K. Hoffman, R.J. Homer, A.K. Honma, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, D.C. Imrie, K. Ishii, F.R. Jacob, A. Jawahery, H. Jeremie, M. Jimack, C.R. Jones, P. Jovanovic, T.R. Junk, N. Kanaya, J. Kanzaki, G. Karapetian, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, P.I. Kayal, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, D.H. Kim, K. Klein, A. Klier, T. Kobayashi, M. Kobel, T.P. Kokott, M. Kolrep, S. Komamiya, R.V. Kowalewski, T. Kress, P. Krieger, J. von Krogh, T. Kuhl, M. Kupper, P. Kyberd, G.D. Lafferty, H. Landsman, D. Lanske, I. Lawson, J.G. Layter, A. Leins, D. Lellouch, J. Letts, L. Levinson, R. Liebisch, J. Lillich, B. List, C. Littlewood, A.W. Lloyd, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Lu, J. Ludwig, A. Macchiolo, A. Macpherson, W. Mader, M. Mannelli, S. Marcellini, T.E. Marchant, A.J. Martin, J.P. Martin, G. Martinez, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, T.J. McMahon, R.A. McPherson, F. Meijers, P. Mendez-Lorenzo, F.S. Merritt, H. Mes, I. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D.J. Miller, W. Mohr, A. Montanari, T. Mori, K. Nagai, I. Nakamura, H.A. Neal, R. Nisius, S.W. O'Neale, F.G. Oakham, F. Odorici, H.O. Ogren, A. Okpara, M.J. Oreglia, S. Orito, G. Pásztor, J.R. Pater, G.N. Patrick, J. Patt, R. Perez-Ochoa, P. Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, B. Poli, J. Polok, M. Przybycień, A. Quadt, C. Rembser, H. Rick, S.A. Robins, N. Rodning, J.M. Roney, S. Rosati, K. Roscoe, A.M. Rossi, Y. Rozen, K. Runge, O. Runolfsson, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, W.M. Sang, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, P. Scharff-Hansen, S. Schmitt, A. Schöning, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, M. Sproston, A. Stahl, K. Stephens, K. Stoll, D. Strom, R. Ströhmer, B. Surrow, S.D. Talbot, S. Tarem, R.J. Taylor, R. Teuscher, M. Thiergen, J. Thomas, M.A. Thomson, E. Torrence, S. Towers, T. Trefzger, I. Trigger, Z. Trócsányi, E. Tsur, M.F. Turner-Watson, I. Ueda, R. Van Kooten, P. Vannerem, M. Verzocchi, H. Voss, D. Waller, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, T. Wengler, N. Wermes, D. Wetterling, J.S. White, G.W. Wilson, J.A. Wilson, T.R. Wyatt, S. Yamashita, V. Zacek, and D. Zer-Zion
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, Form factor (quantum field theory), Zero (complex analysis), Value (computer science), 01 natural sciences, Recoil, 0103 physical sciences, Heavy quark effective theory, Matrix element, 010306 general physics
Abstract: The magnitude of the Cabibbo-Kobayashi-Maskawa matrix element Vcb has been measured using B0 to D*l nu decays recorded on the Z0 peak using the OPAL detector at LEP. The D* to D0 pi+ decays were reconstructed both in the particular decay modes D0 to K- pi+ and D0 to K- pi+ pi- and via an inclusive technique. The product of |Vcb| and the decay form factor of the B0 to D* l nu transition at zero recoil F(1) was measured to be F(1)|Vcb| = (37.1+-1.0+-2.0)x10^-3, where the uncertainties are statistical and systematic respectively. By using Heavy Quark Effective Theory calculations for F(1), a value of |Vcb| = (40.7+-1.1+-2.2+-1.6)x 10^-3 was obtained, where the third error is due to theoretical uncertainties in the value of F(1). The branching ratio Br(B0 to D* l nu) was also measured to be (5.26+-0.20+-0.46)%.
Published: 2000

36. Search for anomalous production of acoplanar di-lepton events in ${\rm e^+e^-}$ collisions at $\sqrt{s} =$ 183 and 189 GeV

Author: P. Ferrari, Randall Sobie, H. Mes, Naoko Kanaya, R. J. Hemingway, G. D. Lafferty, I. P. Duerdoth, S. Braibant, J. Lillich, Christopher Hawkes, German Martinez, K. Stephens, H. O. Ogren, B. W. Kennedy, P. Jovanovic, C. Littlewood, Christoph Geich-Gimbel, Gideon Bella, K. Stoll, Andris Skuja, S. Petzold, Austin Ball, Guenter Duckeck, A. A. Faust, P. Hüntemeyer, Daniel Lellouch, L. Brigliadori, H. J. Burckhart, Jacqueline Batley, Peter R Hobson, D. Zer-Zion, Takehiko Mori, Peter Krieger, Vakhtang Kartvelishvili, Tetsuro Mashimo, S. W. O'Neale, M. F. Turner-Watson, K. J. Anderson, Sachio Komamiya, A. Okpara, P. Mättig, T. J. McMahon, Richard Teuscher, R. Kowalewski, Erez Etzion, M. A. Thomson, A. T. Watson, Matthias Schröder, D. E. Plane, F. Fiedler, M. Thiergen, J. E. Conboy, A. Fürtjes, S. Arcelli, Alessandro Montanari, I. Meyer, C. Couyoumtzelis, T. P. Kokott, J. Dubbert, D. Waller, E. K. U. Gross, M. Verzocchi, W. Gorn, R. K. Carnegie, Shlomit Tarem, Lutz Feld, R. Van Kooten, T. Saeki, G. M. Dallavalle, Alessandra Fanfani, R. Davis, G. Gaycken, P. G. Bright-Thomas, J. A. Wilson, M. Sproston, C. R. Jones, J. Böhme, B. Surrow, M. Schumacher, M. Boutemeur, F. S. Merritt, Gideon Alexander, Thomas E Marchant, Paolo Capiluppi, Michael Hildreth, Achim Stahl, I. Trigger, Stefan Schmitt, Alain Bellerive, M. Kolrep, N. L. Rodning, T. Kuhl, Paul Kyberd, F. K. Loebinger, P. Dervan, S. Yamashita, P. Scharff-Hansen, B. Poli, F. Odorici, K. Graham, F. Wäckerle, D. R. Ward, Tara Shears, H. Voss, R. J. Barlow, Georges Azuelos, Ivor Fleck, Richard Nisius, B. List, Ekg Sarkisyan, D. M. Gingrich, P. Igo-Kemenes, E. Tsur, Ehud Duchovni, D. Axen, A. Jawahery, Oana Elena Vickey Boeriu, J. Grunhaus, J. Bechtluft, J. A. McKenna, D. J. Miller, Joleen Pater, K. W. Bell, J. Goldberg, Dave Charlton, Marco Cuffiani, K. Ishii, H. Jeremie, S. B. Anderson, Shoji Asai, M. Jimack, A. M. Smith, K. Hoffman, A. Klier, A. Michelini, Juergen Thomas, M. Przybycień, H. A. Neal, M. Fanti, T. Kress, J. C. Hill, J. M. Roney, S. Spagnolo, A. M. Rossi, W. R. Gibson, W. J. McDonald, B. C. Shen, A. A. Carter, I. J. Bloodworth, M. Donkers, Kiyotomo Kawagoe, K. Harder, Siegfried Bethke, D. Liu, A. K. Honma, Robert McPherson, Paolo Giacomelli, T. Kobayashi, Stan Bentvelsen, O. Schaile, M. Hansroul, Koichi Nagai, John Allison, W. G. Scott, J. Schieck, R. Hawkings, I. Nakamura, H. Landsman, Peter Sherwood, I. Cohen, R. D. Heuer, Christoph Rembser, James Pinfold, S. Robertson, Yoram Rozen, W. Mohr, Fabrizio Fabbri, A. Frey, R. Perez-Ochoa, R. Seuster, Giovanni Abbiendi, A. J. Martin, Claudia Ciocca, M. Harin-Dirac, S. A. Robins, R. L. Coxe, T. Trefzger, R. J. Homer, R. G. Kellogg, Junichi Kanzaki, J. Polok, R. M. Brown, D. Karlen, D. R. Rust, P. Mendez-Lorenzo, F. G. Oakham, R. Liebisch, K. Ackerstaff, Alexander Wagner, A. Macchiolo, J. Ludwig, A. Hocker, Daniele Bonacorsi, K. Runge, P. Bock, Lorne Levinson, Csaba Hajdu, D. Glenzinski, Dezso Horvath, M. J. Losty, Stefano Marcellini, E. L. Barberio, D. Chrisman, G. D. Long, V. Zacek, K. R. Hossain, W. M. Sang, J. Couchman, W. Mader, O. C. Cooke, P. Pfeifenschneider, J. W. Gary, Marcello Mannelli, C. K. Hargrove, Stephen Lloyd, J. Patt, D. C. Imrie, André Schöning, C. H. Shepherd-Themistocleous, J. von Krogh, O. Sahr, C. Sbarra, F. R. Jacob, G. P. Siroli, M. Gruwé, D. Wetterling, Christoph Schwick, K. Roscoe, P. Gagnon, S. Baumann, E. Torrence, Zoltan Laszlo Trocsanyi, E. Clay, Dong Hee Kim, J. Lauber, E. A. Mckigney, S. D. Talbot, T. Behnke, Satoshi Mihara, T. R. Junk, D. Lanske, D. I. Futyan, P. S. Wells, Terry Richard Wyatt, O. Runolfsson, P. G. Estabrooks, R. K. Keeler, N. K. Watson, Arnulf Quadt, P. M. Watkins, Claudio Grandi, J. S. White, M. Fierro, S. Rosati, A. Harel, Ikuo Ueda, D. M. Strom, A. D. Schaile, Gabriella Pasztor, J. Lu, P. Vannerem, G. A. Snow, C. P. Ward, Raimund Ströhmer, S. Söldner-Rembold, P. Poffenberger, Beatrix Dienes, J. Letts, C. Y. Chang, P. Taras, A. Macpherson, K. Sachs, Shlomo Dado, Giora Mikenberg, Klaus Desch, S. F. Ashby, R. Howard, Otmar Biebel, P. I. Kayal, Norbert Wermes, Sherry Towers, T. Kawamoto, S. Orito, S. Betts, M. Hapke, M. J. Oreglia, Gregor Herten, J. E. Pilcher, A. W. Lloyd, G. W. Wilson, M. Hauschild, S.J. Dallison, J. R. Carter, G. N. Patrick, A. Biguzzi, J. G. Layter, P. E.L. Clarke, J. P. Martin, S. De Jong, H. Rick, G. G. Hanson, G. Giacomelli, I. Lawson, A. De Roeck, M. Kobel, M. S. Dixit, and Frans Meijers
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, High Energy Physics::Phenomenology, Standard Model, Nuclear physics, Chargino, Neutralino, Higgs boson, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), Minimal Supersymmetric Standard Model, Lepton
Abstract: A selection of di-lepton events with significant missing transverse momentum has been performed using a total data sample of 237.4 pb-1 at e+e- centre-of-rnass energies of approximately 183 GeV and 189 GeV. The observed numbers of events - 78 at 183 GeV and 301 at 189 GeV - are consistent with the numbers expected from Standard Model processes, which arise predominantly from W+W- production with both W bosons decaying leptonically. This topology is also an experimental signature for the pair production of new particles that decay to a charged lepton accompanied by one or more invisible particles. Discrimination techniques are described that optimise the sensitivity to particular new physics channels. No evidence for new phenomena is apparent. Upper limits on the production cross-section times branching ratio squared for sleptons and for leptonically decaying charginos and charged Higgs are presented in a manner intended to minimise the number of model assumptions. Assuming a 100% branching ratio for the decay l±R → l±χ01, where χ01 is the lightest neutralino, we exclude at 95% CL: right-handed smuons with masses below 82.3 GeV for mμ- - mχ01 > 3 GeV and right-handed staus with masses below 81.0 GeV for mτ- -mχ01 > 8 GeV. Right-handed selectrons are excluded at 95% CL for masses below 87.1 GeV for mẽ - mχ01 > 5 GeV, within the framework of the Minimal Supersymmetric Standard Model assuming μ, < - 100 GeV and tan β= 1.5. Charged Higgs bosons, H±, are excluded at 95% CL for masses below 82.8 GeV, assuming a 100% branching ratio for the decay H± → τ ± vτ.
Published: 2000

37. A study of parton fragmentation in hadronic Z $^0$ decays using $\Lambda\bar\Lambda$ correlations

Author: B. Nellen, H. G. Evans, I. Cohen, Tara Shears, Christoph Rembser, C. Hartmann, D. E. Plane, T. J. McMahon, C. Couyoumtzelis, Stephen Hillier, G. Gaycken, P. G. Bright-Thomas, J. Dubbert, G. M. Dallavalle, S. A. Robins, R. K. Carnegie, M. Schumacher, M. Herndon, M. Bobinski, R. Liebisch, K. Stoll, P. G. Estabrooks, R. K. Keeler, J. A. Wilson, J. Böhme, Andris Skuja, K. Ackerstaff, Matthias Schröder, M. Thiergen, Gregor Herten, N. K. Watson, Dave Charlton, S. Petzold, P. M. Watkins, D. Lazic, A. Macpherson, M. Fierro, Randall Sobie, G. D. Lafferty, A. J. Martin, F. Odorici, Tetsuro Mashimo, S. R. Lautenschlager, J. Grunhaus, W. Mader, Erez Etzion, C. K. Hargrove, S. Betts, M. Hapke, S. Yamashita, J. E. Pilcher, Stefan Kluth, Shlomit Tarem, Stefan Schmitt, K. Roscoe, H. A. Neal, R. Bürgin, B. Surrow, C. Y. Chang, D. R. Rust, A. W. Lloyd, P. Igo-Kemenes, Georges Azuelos, P. E.L. Clarke, O. Runolfsson, A. D. Schaile, Gabriella Pasztor, E. Tsur, P. Vannerem, M. J. Oreglia, Klaus Kurt Desch, G. W. Wilson, W. Gorn, K. Ishii, H. Jeremie, M. Hauschild, C. Markopoulos, John Allison, J. Lauber, G. Yekutieli, S. Baumann, M. Przybycień, Guenter Duckeck, Sachio Komamiya, A. T. Watson, A. A. Carter, R. Howard, M. Verzocchi, K. W. Bell, P. Taras, Ron Folman, A. M. Lee, E. von Törne, E. A. Mckigney, E. Torrence, Claudio Grandi, J. S. White, J. Pálinkás, T. P. Kokott, G. A. Snow, C. P. Ward, J. P. Martin, J. R. Carter, S. Söldner-Rembold, G. N. Patrick, R. Mir, R. Hawkings, Otmar Biebel, E. Clay, Shoji Asai, Gideon Bella, Ekg Sarkisyan, T. Saeki, R. Davis, J. C. Hill, J. Letts, M. Fanti, O. Schaile, H. J. Burckhart, Daniel Lellouch, D. I. Futyan, Jacqueline Batley, P. I. Kayal, Takehiko Mori, H. Mes, James Pinfold, R. Perez-Ochoa, R. Seuster, Giovanni Abbiendi, S. De Jong, Claire Shepherd-Themistocleous, S. Robertson, Daniele Bonacorsi, S. B. Anderson, K. Sachs, Shlomo Dado, I. P. Duerdoth, S. Braibant, Norbert Wermes, Sherry Towers, T. Kawamoto, W. J. McDonald, W. R. Gibson, B. C. Shen, Robert McPherson, M. Boutemeur, F. S. Merritt, D. M. Strom, P. Mättig, J. Gascon, S. Orito, K. Harder, F. G. Oakham, B. Schmitt, E. L. Barberio, R. E. Schmitz, R. D. Heuer, Fabrizio Fabbri, Sven Menke, D. Lanske, Siegfried Bethke, D. Liu, Giora Mikenberg, S. F. Ashby, H. Rick, V. Zacek, R. Van Kooten, Stan Bentvelsen, J. von Krogh, P. Hüntemeyer, Raimund Ströhmer, R. J. Hemingway, A. A. Faust, A. K. Honma, W. G. Scott, S. D. Talbot, J. W. Gary, C. R. Jones, D. S. Koetke, R. M. Brown, Lorne Levinson, M. F. Turner-Watson, M. Gruwé, L. A. del Pozo, Marcello Mannelli, Peter R Hobson, I. Nakamura, B. W. Kennedy, P. Jovanovic, D. M. Gingrich, P. Scharff-Hansen, J. Bechtluft, Richard Teuscher, I. J. Bloodworth, D. Zer-Zion, A. S. Turcot, F. Fiedler, P. Poffenberger, J. A. McKenna, T. R. Junk, D. Eatough, Austin Ball, Peter Krieger, A. Macchiolo, A. M. Smith, P. S. Wells, D. Glenzinski, Dezso Horvath, M. J. Losty, R. G. Kellogg, G. G. Hanson, Jean-Arcady Meyer, Terry Richard Wyatt, C. M. Hawkes, Yoram Rozen, M. Kolrep, T. Behnke, R. Bartoldus, Alessandro Montanari, T. Kuhl, H. O. Ogren, J. Polok, G. Giacomelli, I. Lawson, Richard Nisius, Christoph Geich-Gimbel, D. Karlen, A. De Roeck, M. Kobel, O. C. Cooke, Beatrix Dienes, B. List, Marco Cuffiani, P. Pfeifenschneider, M. S. Dixit, Frans Meijers, Vakhtang Kartvelishvili, J. E. Conboy, A. Fürtjes, P. Gagnon, Stefano Marcellini, L. Brigliadori, N. Altekamp, H. Voss, R. J. Barlow, A. Biguzzi, D. J. Miller, J. Patt, J. G. Layter, A. Sittler, Zoltan Laszlo Trocsanyi, André Schöning, O. Sahr, W. M. Sang, S. W. O'Neale, K. J. Anderson, S. D. Bird, D. Axen, A. Jawahery, Peter Sherwood, Alexander Wagner, J. Ludwig, K. Runge, P. Bock, Paolo Giacomelli, C. Sbarra, F. R. Jacob, M. Hansroul, Paul Kyberd, F. K. Loebinger, J. Steuerer, Ivor Fleck, C. Burgard, Joleen Pater, A. Klier, R. J. Homer, Satoshi Mihara, Kiyotomo Kawagoe, Achim Stahl, K. R. Hossain, D. C. Imrie, G. P. Siroli, K. Stephens, Christoph Schwick, C. Littlewood, V. Gibson, I. Trigger, F. Scharf, German Martinez, D. R. Ward, T. Kress, J. M. Roney, Ehud Duchovni, Koichi Nagai, J. Schieck, W. Mohr, M. Jimack, M. A. Thomson, A. Michelini, Claudia Ciocca, F. Wöckerle, E. K. U. Gross, M. Sproston, S. M. Gascon-Shotkin, Satoshi Tanaka, T. Kobayashi, A. M. Rossi, R. L. Coxe, A. Hocker, D. Chrisman, G. D. Long, Volker Blobel, Michael Hildreth, Alain Bellerive, Stephen Lloyd, N. L. Rodning, R. Kowalewski, S. Arcelli, Gideon Alexander, Paolo Capiluppi, and J. Goldberg
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Hyperon, Parton, Lambda, Lambda baryon, Nuclear physics, Baryon, High Energy Physics::Experiment, Rapidity, Engineering (miscellaneous)
Abstract: The correlated production of $\Lambda$ and $\bar\Lambda$ baryons has been studied using 4.3 million multihadronic ${\rm Z}^0$ decays recorded with the Opal detector at Lep. Lambda pairs were investigated in the full data sample and for the first time also in 2-jet and 3-jet events selected with the $k_\perp$ algorithm. The distributions of rapidity differences from correlated $\Lambda\bar\Lambda$ pairs exhibit short-range, local correlations and prove to be a sensitive tool to test models, particularly for 2-jet events. The Jetset model describes the data best but some extra parameter tuning is needed to improve agreement with the experimental results in the rates and the rapidity spectra simultaneously. The recently developed modification of Jetset, the MOdified Popcorn Scenarium (Mops), and also Herwig do not give satisfactory results. This study of di-lambda production in 2- and 3-jet events supports the short-range compensation of quantum numbers.
Published: 2000

38. Z boson pair production in e+e− collisions at and 189 GeV

Author: G. Abbiendi, K. Ackerstaff, P.F. Akesson, G. Alexander, J. Allison, K.J. Anderson, S. Arcelli, S. Asai, S.F. Ashby, D. Axen, G. Azuelos, I. Bailey, A.H. Ball, E. Barberio, R.J. Barlow, J.R. Batley, S. Baumann, T. Behnke, K.W. Bell, G. Bella, A. Bellerive, S. Bentvelsen, S. Bethke, O. Biebel, A. Biguzzi, I.J. Bloodworth, P. Bock, J. Böhme, O. Boeriu, D. Bonacorsi, M. Boutemeur, S. Braibant, P. Bright-Thomas, L. Brigliadori, R.M. Brown, H.J. Burckhart, J. Cammin, P. Capiluppi, R.K. Carnegie, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, D. Chrisman, C. Ciocca, P.E.L. Clarke, E. Clay, I. Cohen, O.C. Cooke, J. Couchman, C. Couyoumtzelis, R.L. Coxe, M. Cuffiani, S. Dado, G.M. Dallavalle, S. Dallison, R. Davis, A. de Roeck, P. Dervan, K. Desch, B. Dienes, M.S. Dixit, M. Donkers, J. Dubbert, E. Duchovni, G. Duckeck, I.P. Duerdoth, P.G. Estabrooks, E. Etzion, F. Fabbri, A. Fanfani, M. Fanti, A.A. Faust, L. Feld, P. Ferrari, F. Fiedler, M. Fierro, I. Fleck, A. Frey, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, D.M. Gingrich, D. Glenzinski, J. Goldberg, W. Gorn, C. Grandi, K. Graham, E. Gross, J. Grunhaus, M. Gruwé, P.O. Günther, C. Hajdu, G.G. Hanson, M. Hansroul, M. Hapke, K. Harder, A. Harel, C.K. Hargrove, M. Harin-Dirac, A. Hauke, M. Hauschild, C.M. Hawkes, R. Hawkings, R.J. Hemingway, C. Hensel, G. Herten, R.D. Heuer, M.D. Hildreth, J.C. Hill, P.R. Hobson, A. Hocker, K. Hoffman, R.J. Homer, A.K. Honma, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, D.C. Imrie, K. Ishii, F.R. Jacob, A. Jawahery, H. Jeremie, M. Jimack, C.R. Jones, P. Jovanovic, T.R. Junk, N. Kanaya, J. Kanzaki, G. Karapetian, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, P.I. Kayal, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, D.H. Kim, K. Klein, A. Klier, T. Kobayashi, M. Kobel, T.P. Kokott, M. Kolrep, S. Komamiya, R.V. Kowalewski, T. Kress, P. Krieger, J. von Krogh, T. Kuhl, M. Kupper, P. Kyberd, G.D. Lafferty, H. Landsman, D. Lanske, I. Lawson, J.G. Layter, A. Leins, D. Lellouch, J. Letts, L. Levinson, R. Liebisch, J. Lillich, B. List, C. Littlewood, A.W. Lloyd, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Lu, J. Ludwig, A. Macchiolo, A. Macpherson, W. Mader, M. Mannelli, S. Marcellini, T.E. Marchant, A.J. Martin, J.P. Martin, G. Martinez, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, T.J. McMahon, R.A. McPherson, F. Meijers, P. Mendez-Lorenzo, F.S. Merritt, H. Mes, I. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D.J. Miller, W. Mohr, A. Montanari, T. Mori, K. Nagai, I. Nakamura, H.A. Neal, R. Nisius, S.W. O'Neale, F.G. Oakham, F. Odorici, H.O. Ogren, A. Okpara, M.J. Oreglia, S. Orito, G. Pásztor, J.R. Pater, G.N. Patrick, J. Patt, R. Perez-Ochoa, P. Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, B. Poli, J. Polok, M. Przybycień, A. Quadt, C. Rembser, H. Rick, S.A. Robins, N. Rodning, J.M. Roney, S. Rosati, K. Roscoe, A.M. Rossi, Y. Rozen, K. Runge, O. Runolfsson, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, W.M. Sang, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, P. Scharff-Hansen, S. Schmitt, A. Schöning, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, M. Sproston, A. Stahl, K. Stephens, K. Stoll, D. Strom, R. Ströhmer, B. Surrow, S.D. Talbot, S. Tarem, R.J. Taylor, R. Teuscher, M. Thiergen, J. Thomas, M.A. Thomson, E. Torrence, S. Towers, T. Trefzger, I. Trigger, Z. Trócsányi, E. Tsur, M.F. Turner-Watson, I. Ueda, R. Van Kooten, P. Vannerem, M. Verzocchi, H. Voss, D. Waller, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, T. Wengler, N. Wermes, D. Wetterling, J.S. White, G.W. Wilson, J.A. Wilson, T.R. Wyatt, S. Yamashita, V. Zacek, and D. Zer-Zion
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, 010308 nuclear & particles physics, State (functional analysis), 01 natural sciences, Standard Model, Pair production, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010303 astronomy & astrophysics, Lepton
Abstract: A study of Z boson pair production in e+e- annihilation at center-of-mass energies near 183 GeV and 189 GeV is reported. Final states containing only leptons, (l+l-l+l- and l+l-nu nubar), quark and lepton pairs, (q qbar l+l-, q qbar nu nubar) and the all-hadronic final state (q qbar q qbar) are considered. In all states with at least one Z boson decaying hadronically, q qbar and b bbar final states are considered separately using lifetime and event-shape tags, thereby improving the cross-section measurement. At sqrt(s) = 189 GeV the Z-pair cross section was measured to be 0.80 (+0.14-0.13, stat.) (+0.06-0.05, syst.) pb, consistent with the Standard Model prediction. At sqrt(s) = 183 GeV the 95% C.L. upper limit is 0.55 pb. Limits on anomalous ZZgamma and ZZZ couplings are derived.
Published: 2000

39. A study of $\mathrm{B_s^0}$ meson oscillation using hadronic $\mathrm Z^0$ decays containing leptons

Author: H. O. Ogren, Erez Etzion, Christoph Geich-Gimbel, Shlomit Tarem, Sachio Komamiya, D. Axen, S. Yamashita, A. T. Watson, A. Jawahery, B. Surrow, Richard Teuscher, P. Igo-Kemenes, Vakhtang Kartvelishvili, F. Fiedler, A. Biguzzi, J. E. Conboy, A. Fürtjes, J. G. Layter, K. Ishii, H. Jeremie, Peter Sherwood, Daniele Bonacorsi, J. von Krogh, M. Gruwé, D. Wetterling, T. P. Kokott, T. Saeki, Lutz Feld, Kiyotomo Kawagoe, O. C. Cooke, Alexander Wagner, A. Macchiolo, W. R. Gibson, P. Pfeifenschneider, T. J. McMahon, C. Couyoumtzelis, S. Betts, A. Macpherson, J. Dubbert, J. Ludwig, M. Hapke, K. Harder, S. A. Robins, R. Liebisch, K. Ackerstaff, J. Letts, R. K. Carnegie, G. Gaycken, P. G. Bright-Thomas, J. A. Wilson, J. Böhme, Raimund Ströhmer, M. Kolrep, Alessandra Fanfani, R. Davis, S. Baumann, K. Runge, P. Bock, M. Przybycień, T. Kress, E. A. Mckigney, A. A. Carter, I. J. Bloodworth, J. Patt, André Schöning, O. Schaile, W. J. McDonald, Giovanni Abbiendi, M. Schumacher, Matthias Schröder, B. C. Shen, R. J. Hemingway, M. A. Thomson, J. Lauber, M. Boutemeur, F. S. Merritt, O. Sahr, Klaus Desch, P. E.L. Clarke, R. Howard, S. Robertson, P. Poffenberger, Siegfried Bethke, D. Liu, A. K. Honma, K. R. Hossain, C. H. Shepherd-Themistocleous, K. Sachs, Christopher Hawkes, W. M. Sang, S. B. Anderson, Shlomo Dado, J. Grunhaus, E. K. U. Gross, R. L. Coxe, M. Thiergen, F. Odorici, W. G. Scott, Yoram Rozen, J. P. Martin, B. W. Kennedy, T. Kuhl, S. De Jong, I. Nakamura, Richard Nisius, J. Goldberg, J. Bechtluft, M. Sproston, P. Jovanovic, M. J. Oreglia, Stan Bentvelsen, Austin Ball, K. Stoll, S. D. Talbot, R. M. Brown, Lorne Levinson, Andris Skuja, Peter Krieger, B. List, H. Rick, Marco Cuffiani, P. Mendez-Lorenzo, Junichi Kanzaki, J. Polok, D. I. Futyan, Gregor Herten, K. Hoffman, Giora Mikenberg, S. F. Ashby, D. Glenzinski, Paolo Giacomelli, D. Karlen, T. Behnke, R. D. Heuer, Alessandro Montanari, Daniel Lellouch, T. R. Junk, P. S. Wells, M. Hansroul, Beatrix Dienes, A. Hocker, J. A. McKenna, I. Cohen, S. Petzold, Juergen Thomas, Tetsuro Mashimo, M. F. Turner-Watson, A. D. Schaile, Randall Sobie, G. D. Lafferty, R. Hawkings, Christoph Rembser, Dezso Horvath, M. J. Losty, Takehiko Mori, A. Okpara, Terry Richard Wyatt, P. Mättig, G. D. Long, G. G. Hanson, C. Y. Chang, Gabriella Pasztor, P. Gagnon, H. Landsman, J. M. Roney, M. Verzocchi, J. E. Pilcher, H. Mes, P. G. Estabrooks, R. K. Keeler, N. K. Watson, M. Harin-Dirac, P. Vannerem, G. A. Snow, C. P. Ward, D. C. Imrie, R. J. Homer, G. Giacomelli, I. Lawson, A. De Roeck, M. Kobel, Arnulf Quadt, Naoko Kanaya, P. M. Watkins, Guenter Duckeck, A. Sittler, Zoltan Laszlo Trocsanyi, I. P. Duerdoth, S. Braibant, F. G. Oakham, P. Taras, Dong Hee Kim, Koichi Nagai, J. Schieck, C. Sbarra, F. R. Jacob, Stefan Schmitt, G. P. Siroli, S. Söldner-Rembold, W. Gorn, J. R. Carter, G. N. Patrick, E. L. Barberio, A. J. Martin, M. S. Dixit, Stephen Lloyd, Frans Meijers, Satoshi Mihara, P. Hüntemeyer, Christoph Schwick, K. Roscoe, W. Mohr, John Allison, Otmar Biebel, Georges Azuelos, E. Tsur, Shoji Asai, P. Scharff-Hansen, A. A. Faust, Achim Stahl, O. Runolfsson, K. W. Bell, N. Altekamp, H. Voss, A. W. Lloyd, E. Torrence, R. J. Barlow, D. J. Miller, J. Couchman, W. Mader, Ehud Duchovni, A. M. Smith, R. G. Kellogg, K. Stephens, J. C. Hill, E. Clay, C. K. Hargrove, K. Graham, G. W. Wilson, M. Jimack, Csaba Hajdu, S. Spagnolo, C. Littlewood, Tara Shears, P. I. Kayal, Claudio Grandi, J. S. White, Stefano Marcellini, M. Hauschild, German Martinez, Ekg Sarkisyan, James Pinfold, L. Brigliadori, R. Perez-Ochoa, R. Seuster, V. Gibson, A. Michelini, Norbert Wermes, Sherry Towers, D. E. Plane, T. Kawamoto, D. Lanske, V. Zacek, Paul Kyberd, F. K. Loebinger, I. Trigger, T. Kobayashi, J. W. Gary, J. Steuerer, Ivor Fleck, D. R. Ward, S. Orito, G. M. Dallavalle, Marcello Mannelli, Joleen Pater, A. Klier, H. A. Neal, M. Fierro, R. Kowalewski, S. W. O'Neale, S. Arcelli, K. J. Anderson, Gideon Alexander, Paolo Capiluppi, Gideon Bella, H. J. Burckhart, Jacqueline Batley, C. R. Jones, M. Fanti, Peter R Hobson, D. Zer-Zion, Robert McPherson, Fabrizio Fabbri, A. Frey, R. Van Kooten, Claudia Ciocca, F. Wäckerle, D. M. Gingrich, A. M. Rossi, Michael Hildreth, Alain Bellerive, N. L. Rodning, P. Dervan, B. Poli, D. R. Rust, S. Rosati, A. Harel, Ikuo Ueda, D. M. Strom, and J. Lu
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Oscillation, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Charge (physics), Jet (particle physics), Nuclear physics, High Energy Physics::Experiment, Production (computer science), Engineering (miscellaneous), Lepton
Abstract: A sample of ${\rm Z}^0$ decays containing b-flavoured hadrons is tagged using leptons, and events having precise proper time measurements are selected. These events are used to study ${\rm B}^0_{\rm s}$ oscillations. The flavour (b or $\rm \bar{b}$) at decay is determined from the lepton charge while the flavour at production is determined from jet charge or the charge of a second lepton, where available. The experiment was not able to resolve the oscillatory behaviour, and we deduce that the ${\rm B}^0_{\rm s}$ oscillation frequency $\Delta m_{\rm s} > 5.2$ ps$^{-1}$ at the 95% confidence level.
Published: 1999

40. Intermittency and correlations in hadronic Z $^0$ decays

Author: K. Stephens, M. Schumacher, P. G. Estabrooks, F. Odorici, N. K. Watson, D. R. Rust, C. Littlewood, H. A. Neal, Otmar Biebel, P. Scharff-Hansen, P. M. Watkins, K. Hoffman, V. Gibson, Claire Shepherd-Themistocleous, A. M. Lee, J. Goldberg, Erez Etzion, Shlomit Tarem, B. Surrow, G. G. Hanson, Richard Teuscher, A. S. Turcot, N. Altekamp, H. Voss, A. Macpherson, H. O. Ogren, Christoph Geich-Gimbel, I. Trigger, F. Fiedler, Richard Keeler, D. R. Ward, A. M. Smith, P. I. Kayal, K. Stoll, G. Giacomelli, S. Yamashita, I. Lawson, R. J. Barlow, D. J. Miller, I. Cohen, Christoph Rembser, H. Mes, I. P. Duerdoth, S. Braibant, D. Axen, A. Jawahery, T. J. McMahon, A. De Roeck, M. Kobel, P. Igo-Kemenes, M. Hoch, K. Ishii, H. Jeremie, Dave Charlton, C. Couyoumtzelis, M. Fanti, S. A. Robins, M. S. Dixit, O. C. Cooke, S. Spagnolo, Andris Skuja, S. Petzold, Tetsuro Mashimo, A. A. Faust, Peter Sherwood, Alexander Wagner, R. Liebisch, K. Ackerstaff, Norbert Wermes, Sherry Towers, T. Kawamoto, Frans Meijers, J. Dubbert, P. Pfeifenschneider, M. F. Turner-Watson, I. J. Bloodworth, Vakhtang Kartvelishvili, P. Hüntemeyer, R. K. Carnegie, A. J. Martin, R. Kowalewski, J. E. Conboy, A. Fürtjes, R. Howard, P. E.L. Clarke, J. Ludwig, K. Runge, R. Mir, P. Bock, M. Kolrep, J. Patt, R. Hawkings, Satoshi Mihara, Paul Kyberd, S. Orito, S. Arcelli, M. Herndon, F. K. Loebinger, S. Baumann, J. A. Wilson, J. Böhme, Michael Hildreth, Alain Bellerive, André Schöning, Robert McPherson, J. P. Martin, O. Sahr, H. Landsman, P. Gagnon, J. Steuerer, Ivor Fleck, O. Schaile, S. Robertson, R. D. Heuer, E. A. Mckigney, Gideon Alexander, N. L. Rodning, W. Gorn, W. Mader, Paolo Capiluppi, Joleen Pater, P. Dervan, B. Poli, Peter R Hobson, S. De Jong, A. Klier, F. G. Oakham, A. Sittler, D. Zer-Zion, D. C. Imrie, C. K. Hargrove, S. Betts, Yoram Rozen, S. B. Anderson, Matthias Schröder, W. R. Gibson, Gregor Herten, R. L. Coxe, Georges Azuelos, K. Harder, Fabrizio Fabbri, A. Frey, H. Rick, E. L. Barberio, D. Lazic, A. Macchiolo, Zoltan Laszlo Trocsanyi, Dong Hee Kim, M. Hapke, A. Hocker, M. Thiergen, Gideon Bella, H. J. Burckhart, Jacqueline Batley, D. Chrisman, G. D. Long, E. Tsur, D. I. Futyan, Volker Blobel, R. J. Hemingway, T. Kuhl, J. Lauber, R. Van Kooten, S. M. Gascon-Shotkin, Paolo Giacomelli, Sven Menke, Christopher Hawkes, G. Yekutieli, M. Verzocchi, K. W. Bell, J. Pálinkás, J. Grunhaus, G. P. Siroli, M. Przybycień, Junichi Kanzaki, J. Polok, M. Boutemeur, F. S. Merritt, B. W. Kennedy, W. M. Sang, P. Jovanovic, Richard Nisius, D. Karlen, M. Hansroul, S. D. Talbot, Stan Bentvelsen, Christoph Schwick, T. Kress, M. J. Oreglia, J. E. Pilcher, Stephen Lloyd, Austin Ball, J. C. Hill, T. R. Junk, K. Graham, A. A. Carter, Ron Folman, P. S. Wells, B. List, Peter Krieger, Marco Cuffiani, Tara Shears, R. M. Brown, Ehud Duchovni, Lorne Levinson, Alessandro Montanari, W. J. McDonald, M. Jimack, B. C. Shen, A. M. Rossi, A. Biguzzi, J. G. Layter, F. Wäckerle, Terry Richard Wyatt, D. M. Gingrich, Randall Sobie, G. D. Lafferty, Giovanni Abbiendi, A. Michelini, J. R. Carter, C. R. Jones, Siegfried Bethke, D. Liu, A. K. Honma, W. G. Scott, T. Kobayashi, Juergen Thomas, J. Bechtluft, J. A. McKenna, Stefan Schmitt, G. N. Patrick, Daniele Bonacorsi, I. Nakamura, S. Rosati, R. J. Homer, C. Sbarra, F. R. Jacob, Sachio Komamiya, A. T. Watson, A. Harel, Ikuo Ueda, D. M. Strom, J. von Krogh, Guenter Duckeck, D. Glenzinski, J. Lu, Dezso Horvath, M. J. Losty, John Allison, T. P. Kokott, T. Saeki, Claudia Ciocca, K. Roscoe, Jean-Arcady Meyer, Klaus Kurt Desch, M. Gruwé, Shoji Asai, Alessandra Fanfani, R. Davis, E. Torrence, E. Clay, Achim Stahl, R. G. Kellogg, Daniel Lellouch, T. Behnke, Stefano Marcellini, A. W. Lloyd, Kiyotomo Kawagoe, G. W. Wilson, Takehiko Mori, D. E. Plane, P. Mättig, M. Hauschild, C. Markopoulos, G. M. Dallavalle, K. R. Hossain, James Pinfold, R. Perez-Ochoa, R. Seuster, J. Gascon, V. Zacek, M. A. Thomson, J. W. Gary, L. Brigliadori, Ekg Sarkisyan, E. K. U. Gross, Marcello Mannelli, M. Sproston, S. W. O'Neale, K. J. Anderson, Raimund Ströhmer, J. Letts, P. Poffenberger, German Martinez, Beatrix Dienes, J. M. Roney, C. Y. Chang, P. Taras, D. Lanske, Koichi Nagai, J. Schieck, W. Mohr, M. Fierro, S. R. Lautenschlager, K. Sachs, O. Runolfsson, Shlomo Dado, Claudio Grandi, J. S. White, Giora Mikenberg, S. F. Ashby, A. D. Schaile, Gabriella Pasztor, P. Vannerem, G. A. Snow, C. P. Ward, S. Söldner-Rembold, G. Gaycken, and P. G. Bright-Thomas
Subjects: Physics, Quantum chromodynamics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Hadron, Monte Carlo method, Fizikai tudományok, Multiplicity (mathematics), Bose–Einstein correlations, law.invention, Nuclear physics, Természettudományok, law, Intermittency, High Energy Physics::Experiment, Engineering (miscellaneous), Cumulant, Particle Physics - Experiment
Abstract: A multidimensional study of local multiplicity fluctuations and multiparticle correlations of hadrons produced in Z decays is performed. The study is based on the data sample of more than 4 million events recorded with the OPAL detector at LEP. The fluctuations and correlations are analysed in terms of the normalized scaled factorial moments and cumulants up to the fifth order. The moments are observed to have intermittency-like behaviour, which is found to be more pronounced with increasing dimension. The large data sample allows for the first time a study of the factorial cumulants in e+e- annihilation. The analysis of the cumulants shows the existence of genuine multiparticle correlations with a strong intermittency rise up to higher orders. These correlations are found to be stronger in higher dimensions. The decomposition of the factorial moments into lower-order correlations that the dynamical fluctuations have important contributions from genuine many-particle correlations. The Monte Carlo models JETSET 7.4 and HERWIG 5.9 are found to reproduce the trend of the measured moments and cumulants but they underestimate the magnitudes. The results are found to be consistent with QCD jet formation dynamics, although additional contributions from other mechanisms in the hadronization process cannot be excluded. A multidimensional study of local multiplicity fluctuations and multiparticle correlations of hadrons produced in Z decays is performed. The study is based on the data sample of more than 4 million events recorded with the OPAL detector at LEP. The fluctuations and correlations are analysed in terms of the normalized scaled factorial moments and cumulants up to the fifth order. The moments are observed to have intermittency-like behaviour, which is found to be more pronounced with increasing dimension. The large data sample allows for the first time a study of the factorial cumulants in e+e- annihilation. The analysis of the cumulants shows the existence of genuine multiparticle correlations with a strong intermittency rise up to higher orders. These correlations are found to be stronger in higher dimensions. The decomposition of the factorial moments into lower-order correlations shows that the dynamical fluctuations have important contributions from genuine many-particle correlations. The Monte Carlo models JETSET 7.4 and HERWIG 5.9 are found to reproduce the trend of the measured moments and cumulants but they underestimate the magnitudes. The results are found to be consistent with QCD jet formation dynamics, although additional contributions from other mechanisms in the hadronization process cannot be excluded.
Published: 1999

41. A measurement of the product branching ratio $f ({\rm b} \to \Lambda_{\rm b}) \cdot{\rm BR} (\Lambda_{\rm b} \to \Lambda {\rm X})$ in ${\rm Z}^0$ decays

Author: Raimund Ströhmer, A. Harel, Ikuo Ueda, D. M. Strom, P. G. Estabrooks, R. K. Keeler, P. Poffenberger, Dave Charlton, N. K. Watson, Michael Hildreth, Sachio Komamiya, Alain Bellerive, A. T. Watson, Claire Shepherd-Themistocleous, N. L. Rodning, P. Dervan, Otmar Biebel, F. Scharf, German Martinez, W. M. Sang, Beatrix Dienes, P. M. Watkins, S. Yamashita, A. Macpherson, R. D. Heuer, T. P. Kokott, S. M. Gascon-Shotkin, P. Igo-Kemenes, M. Hoch, K. Ishii, H. Jeremie, T. J. McMahon, C. Couyoumtzelis, T. Saeki, Gideon Bella, Achim Stahl, R. Howard, T. R. Junk, J. Dubbert, P. S. Wells, R. Davis, Terry Richard Wyatt, A. M. Rossi, R. K. Carnegie, H. J. Burckhart, Jacqueline Batley, P. I. Kayal, M. Herndon, A. A. Faust, O. Schaile, R. L. Coxe, D. R. Rust, J. A. Wilson, J. Böhme, J. Lauber, C. Sbarra, Norbert Wermes, F. R. Jacob, J. Grunhaus, Sherry Towers, T. Kawamoto, S. Robertson, L. Brigliadori, M. A. Thomson, M. Boutemeur, F. S. Merritt, H. Mes, A. Hocker, E. K. U. Gross, D. Lazic, I. P. Duerdoth, S. Braibant, C. R. Jones, S. Orito, Sven Menke, O. C. Cooke, A. M. Lee, John Allison, E. von Törne, M. Sproston, D. Chrisman, G. D. Long, Volker Blobel, P. Pfeifenschneider, Kiyotomo Kawagoe, Claudia Ciocca, A. W. Lloyd, Juergen Thomas, G. W. Wilson, S. R. Lautenschlager, G. Yekutieli, J. Patt, André Schöning, P. Hüntemeyer, M. Przybycień, Stephen Lloyd, T. Kress, R. G. Kellogg, O. Sahr, J. Bechtluft, M. Fanti, A. A. Carter, S. W. O'Neale, J. A. McKenna, Ron Folman, M. Hauschild, C. Markopoulos, K. J. Anderson, Stefano Marcellini, R. Mir, R. Hawkings, O. Runolfsson, J. M. Roney, S. D. Talbot, Ehud Duchovni, C. Y. Chang, Robert McPherson, G. Gaycken, P. G. Bright-Thomas, Paul Kyberd, Giovanni Abbiendi, F. K. Loebinger, Peter R Hobson, M. Jimack, H. Landsman, Koichi Nagai, Paolo Giacomelli, Claudio Grandi, D. Zer-Zion, R. Bartoldus, M. Hansroul, J. Schieck, H. O. Ogren, M. Schumacher, Fabrizio Fabbri, P. Taras, W. Mohr, J. Steuerer, Ivor Fleck, A. Michelini, A. Macchiolo, J. S. White, Ekg Sarkisyan, K. Stephens, Joleen Pater, J. Letts, A. Klier, Christoph Geich-Gimbel, F. Odorici, S. Baumann, Daniele Bonacorsi, R. Van Kooten, E. A. Mckigney, C. Hartmann, D. E. Plane, C. Littlewood, D. Eatough, Satoshi Tanaka, H. A. Neal, T. Kobayashi, R. J. Homer, T. Behnke, V. Gibson, K. R. Hossain, Vakhtang Kartvelishvili, F. G. Oakham, J. von Krogh, T. Kuhl, B. Schmitt, K. Hoffman, E. L. Barberio, G. M. Dallavalle, F. Wäckerle, D. M. Gingrich, J. E. Conboy, A. Fürtjes, Stefan Schmitt, M. Gruwé, I. Trigger, D. R. Ward, Richard Nisius, D. Lanske, B. List, D. C. Imrie, Gregor Herten, N. Altekamp, H. Voss, R. Kowalewski, Satoshi Mihara, S. Arcelli, R. J. Barlow, D. J. Miller, K. Roscoe, J. E. Pilcher, Marco Cuffiani, P. Gagnon, Gideon Alexander, S. Spagnolo, Klaus Kurt Desch, D. I. Futyan, Paolo Capiluppi, G. P. Siroli, M. Fierro, R. J. Hemingway, E. Torrence, E. Clay, K. Sachs, Christoph Schwick, Christopher Hawkes, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, Alessandro Montanari, C. Darling, W. R. Gibson, K. Harder, W. J. McDonald, B. C. Shen, A. Sittler, Zoltan Laszlo Trocsanyi, Shlomo Dado, Dong Hee Kim, R. M. Brown, Lorne Levinson, Siegfried Bethke, D. Liu, A. K. Honma, W. G. Scott, I. Nakamura, S. D. Bird, D. Axen, A. Jawahery, Peter Sherwood, Alexander Wagner, J. Ludwig, D. Glenzinski, Shoji Asai, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, Giora Mikenberg, S. F. Ashby, K. Runge, P. Bock, I. J. Bloodworth, A. D. Schaile, Gabriella Pasztor, P. Vannerem, Georges Azuelos, E. Tsur, S. A. Robins, G. A. Snow, C. P. Ward, S. Söldner-Rembold, M. Verzocchi, Yoram Rozen, K. W. Bell, R. Liebisch, K. Ackerstaff, J. Pálinkás, J. C. Hill, J. Polok, D. Karlen, Daniel Lellouch, Erez Etzion, Takehiko Mori, Stefan Kluth, P. Mättig, Shlomit Tarem, B. Surrow, J. Goldberg, B. Nellen, I. Cohen, Christoph Rembser, Matthias Schröder, M. Thiergen, K. Graham, Tara Shears, A. J. Martin, W. Mader, C. K. Hargrove, A. Biguzzi, J. G. Layter, S. Betts, M. Hapke, P. E.L. Clarke, J. P. Martin, M. J. Oreglia, S. De Jong, H. Rick, G. G. Hanson, J. R. Carter, G. Giacomelli, I. Lawson, James Pinfold, R. Perez-Ochoa, R. Seuster, J. Gascon, G. N. Patrick, A. De Roeck, M. Kobel, V. Zacek, J. W. Gary, M. S. Dixit, Frans Meijers, D. S. Koetke, Marcello Mannelli, K. Stoll, Andris Skuja, S. Petzold, Randall Sobie, G. D. Lafferty, Tetsuro Mashimo, M. F. Turner-Watson, Guenter Duckeck, Richard Teuscher, A. S. Turcot, F. Fiedler, W. Gorn, M. Kolrep, S. B. Anderson, P. Scharff-Hansen, Stan Bentvelsen, and A. M. Smith
Subjects: Physics, Physics and Astronomy (miscellaneous), Branching fraction, High Energy Physics::Phenomenology, High Energy Physics::Experiment, B meson, Atomic physics, Lambda, Engineering (miscellaneous)
Abstract: The product branching ratio, $f ({\rm b} \to \Lambda_{\rm b}) \cdot{\rm BR} (\Lambda_{\rm b} \to \Lambda{\rm X})$, where $\Lambda_{\rm b}$ denotes any weakly-decaying b–baryon, has been measured using the OPAL detector at LEP. $\Lambda_{\rm b}$'s are selected by the presence of energetic $\Lambda$ particles in bottom events tagged by the presence of displaced secondary vertices. A fit to the momenta of the $\Lambda$ particles separates signal from B meson and fragmentation backgrounds. The measured product branching ratio is  Combined with a previous OPAL measurement, one obtains 
Published: 1999

42. Search for scalar top and scalar bottom quarks at = 189 GeV at LEP

Author: G Abbiendi, K Ackerstaff, G Alexander, J Allison, N Altekamp, K.J Anderson, S Anderson, S Arcelli, S Asai, S.F Ashby, D Axen, G Azuelos, A.H Ball, E Barberio, R.J Barlow, J.R Batley, S Baumann, J Bechtluft, T Behnke, K.W Bell, G Bella, A Bellerive, S Bentvelsen, S Bethke, S Betts, O Biebel, A Biguzzi, V Blobel, I.J Bloodworth, P Bock, J Böhme, D Bonacorsi, M Boutemeur, S Braibant, P Bright-Thomas, L Brigliadori, R.M Brown, H.J Burckhart, P Capiluppi, R.K Carnegie, A.A Carter, J.R Carter, C.Y Chang, D.G Charlton, D Chrisman, C Ciocca, P.E.L Clarke, E Clay, I Cohen, J.E Conboy, O.C Cooke, C Couyoumtzelis, R.L Coxe, M Cuffiani, S Dado, G.M Dallavalle, R Davis, S De Jong, A de Roeck, P Dervan, K Desch, B Dienes, M.S Dixit, J Dubbert, E Duchovni, G Duckeck, I.P Duerdoth, P.G Estabrooks, E Etzion, F Fabbri, A Fanfani, M Fanti, A.A Faust, F Fiedler, M Fierro, I Fleck, R Folman, A Frey, A Fürtjes, D.I Futyan, P Gagnon, J.W Gary, J Gascon, S.M Gascon-Shotkin, G Gaycken, C Geich-Gimbel, G Giacomelli, P Giacomelli, V Gibson, W.R Gibson, D.M Gingrich, D Glenzinski, J Goldberg, W Gorn, C Grandi, K Graham, E Gross, J Grunhaus, M Gruwé, G.G Hanson, M Hansroul, M Hapke, K Harder, A Harel, C.K Hargrove, M Hauschild, C.M Hawkes, R Hawkings, R.J Hemingway, M Herndon, G Herten, R.D Heuer, M.D Hildreth, J.C Hill, P.R Hobson, M Hoch, A Hocker, K Hoffman, R.J Homer, A.K Honma, D Horváth, K.R Hossain, R Howard, P Hüntemeyer, P Igo-Kemenes, D.C Imrie, K Ishii, F.R Jacob, A Jawahery, H Jeremie, M Jimack, C.R Jones, P Jovanovic, T.R Junk, J Kanzaki, D Karlen, V Kartvelishvili, K Kawagoe, T Kawamoto, P.I Kayal, R.K Keeler, R.G Kellogg, B.W Kennedy, D.H Kim, A Klier, T Kobayashi, M Kobel, T.P Kokott, M Kolrep, S Komamiya, R.V Kowalewski, T Kress, P Krieger, J von Krogh, T Kuhl, P Kyberd, G.D Lafferty, H Landsman, D Lanske, J Lauber, S.R Lautenschlager, I Lawson, J.G Layter, A.M Lee, D Lellouch, J Letts, L Levinson, R Liebisch, B List, C Littlewood, A.W Lloyd, S.L Lloyd, F.K Loebinger, G.D Long, M.J Losty, J Lu, J Ludwig, D Liu, A Macchiolo, A Macpherson, W Mader, M Mannelli, S Marcellini, C Markopoulos, A.J Martin, J.P Martin, G Martinez, T Mashimo, P Mättig, W.J McDonald, J McKenna, E.A Mckigney, T.J McMahon, R.A McPherson, F Meijers, S Menke, F.S Merritt, H Mes, J Meyer, A Michelini, S Mihara, G Mikenberg, D.J Miller, R Mir, W Mohr, A Montanari, T Mori, K Nagai, I Nakamura, H.A Neal, R Nisius, S.W O'Neale, F.G Oakham, F Odorici, H.O Ogren, M.J Oreglia, S Orito, J Pálinkás, G Pásztor, J.R Pater, G.N Patrick, J Patt, R Perez-Ochoa, S Petzold, P Pfeifenschneider, J.E Pilcher, J Pinfold, D.E Plane, P Poffenberger, B Poli, J Polok, M Przybycień, C Rembser, H Rick, S Robertson, S.A Robins, N Rodning, J.M Roney, S Rosati, K Roscoe, A.M Rossi, Y Rozen, K Runge, O Runolfsson, D.R Rust, K Sachs, T Saeki, O Sahr, W.M Sang, E.K.G Sarkisyan, C Sbarra, A.D Schaile, O Schaile, P Scharff-Hansen, J Schieck, S Schmitt, A Schöning, M Schröder, M Schumacher, C Schwick, W.G Scott, R Seuster, T.G Shears, B.C Shen, C.H Shepherd-Themistocleous, P Sherwood, G.P Siroli, A Sittler, A Skuja, A.M Smith, G.A Snow, R Sobie, S Söldner-Rembold, S Spagnolo, M Sproston, A Stahl, K Stephens, J Steuerer, K Stoll, D Strom, R Ströhmer, B Surrow, S.D Talbot, P Taras, S Tarem, R Teuscher, M Thiergen, J Thomas, M.A Thomson, E Torrence, S Towers, I Trigger, Z Trócsányi, E Tsur, A.S Turcot, M.F Turner-Watson, I Ueda, R Van Kooten, P Vannerem, M Verzocchi, H Voss, F Wäckerle, A Wagner, C.P Ward, D.R Ward, P.M Watkins, A.T Watson, N.K Watson, P.S Wells, N Wermes, J.S White, G.W Wilson, J.A Wilson, T.R Wyatt, S Yamashita, G Yekutieli, V Zacek, and D Zer-Zion
Subjects: Quark, Nuclear and High Energy Physics, Top quark, Particle physics, High Energy Physics::Lattice, Nuclear Theory, FOS: Physical sciences, Fizikai tudományok, 7. Clean energy, 01 natural sciences, Bottom quark, High Energy Physics - Experiment, Charm quark, High Energy Physics - Experiment (hep-ex), Természettudományok, 0103 physical sciences, 010306 general physics, Physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Scalar (physics), Neutralino, High Energy Physics::Experiment, Neutrino, Particle Physics - Experiment, Lepton
Abstract: Searches for a scalar top quark and a scalar bottom quark have been performed using a data sample of 182 pb-1 at a centre-of-mass energy of 189 GeV collected with the OPAL detector at LEP. No evidence for a signal was found. The 95% confidence level lower limit on the scalar top quark mass is 90.3 GeV if the mixing angle between the supersymmetric partners of the left- and right-handed states of the top quark is zero. In the worst case, when the scalar top quark decouples from the Z boson, the lower limit is 87.2 GeV. These limits were obtained assuming that the scalar top quark decays into a charm quark and the lightest neutralino, and that the mass difference between the scalar top quark and the lightest neutralino is larger than 10 GeV. The complementary decay mode of the scalar top quark decaying into a bottom quark, a charged lepton and a scalar neutrino has also been studied. From a search for the scalar bottom quark, a mass limit of 88.6 GeV was obtained if the mass difference between the scalar bottom quark and the lightest neutralino is larger than 7 GeV. These limits significantly improve the previous OPAL limits., 18 pages, LaTeX, including 4 eps figures, submitted to Physics Letters B
Published: 1999

43. Colour reconnection studies in e+e−→W+W− at GeV

Author: G. Abbiendi, K. Ackerstaff, G. Alexander, J. Allison, N. Altekamp, K.J. Anderson, S. Anderson, S. Arcelli, S. Asai, S.F. Ashby, D. Axen, G. Azuelos, A.H. Ball, E. Barberio, R.J. Barlow, R. Bartoldus, J.R. Batley, S. Baumann, J. Bechtluft, T. Behnke, K.W. Bell, G. Bella, A. Bellerive, S. Bentvelsen, S. Bethke, S. Betts, O. Biebel, A. Biguzzi, S.D. Bird, V. Blobel, I.J. Bloodworth, P. Bock, J. Böhme, D. Bonacorsi, M. Boutemeur, S. Braibant, P. Bright-Thomas, L. Brigliadori, R.M. Brown, H.J. Burckhart, P. Capiluppi, R.K. Carnegie, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, D. Chrisman, C. Ciocca, P.E.L. Clarke, E. Clay, I. Cohen, J.E. Conboy, O.C. Cooke, C. Couyoumtzelis, R.L. Coxe, M. Cuffiani, S. Dado, G.M. Dallavalle, R. Davis, S. De Jong, A. de Roeck, P. Dervan, K. Desch, B. Dienes, M.S. Dixit, J. Dubbert, E. Duchovni, G. Duckeck, I.P. Duerdoth, D. Eatough, P.G. Estabrooks, E. Etzion, F. Fabbri, M. Fanti, A.A. Faust, F. Fiedler, M. Fierro, I. Fleck, R. Folman, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, J. Gascon, S.M. Gascon-Shotkin, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, V. Gibson, W.R. Gibson, D.M. Gingrich, D. Glenzinski, J. Goldberg, W. Gorn, C. Grandi, K. Graham, E. Gross, J. Grunhaus, M. Gruwé, G.G. Hanson, M. Hansroul, M. Hapke, K. Harder, A. Harel, C.K. Hargrove, C. Hartmann, M. Hauschild, C.M. Hawkes, R. Hawkings, R.J. Hemingway, M. Herndon, G. Herten, R.D. Heuer, M.D. Hildreth, J.C. Hill, P.R. Hobson, M. Hoch, A. Hocker, K. Hoffman, R.J. Homer, A.K. Honma, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, D.C. Imrie, K. Ishii, F.R. Jacob, A. Jawahery, H. Jeremie, M. Jimack, C.R. Jones, P. Jovanovic, T.R. Junk, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, P.I. Kayal, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, D.H. Kim, A. Klier, S. Kluth, T. Kobayashi, M. Kobel, D.S. Koetke, T.P. Kokott, M. Kolrep, S. Komamiya, R.V. Kowalewski, T. Kress, P. Krieger, J. von Krogh, T. Kuhl, P. Kyberd, G.D. Lafferty, H. Landsman, D. Lanske, J. Lauber, S.R. Lautenschlager, I. Lawson, J.G. Layter, D. Lazic, A.M. Lee, D. Lellouch, J. Letts, L. Levinson, R. Liebisch, B. List, C. Littlewood, A.W. Lloyd, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Ludwig, D. Liu, A. Macchiolo, A. Macpherson, W. Mader, M. Mannelli, S. Marcellini, C. Markopoulos, A.J. Martin, J.P. Martin, G. Martinez, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, E.A. Mckigney, T.J. McMahon, R.A. McPherson, F. Meijers, S. Menke, F.S. Merritt, H. Mes, J. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D.J. Miller, R. Mir, W. Mohr, A. Montanari, T. Mori, K. Nagai, I. Nakamura, H.A. Neal, B. Nellen, R. Nisius, S.W. O'Neale, F.G. Oakham, F. Odorici, H.O. Ogren, M.J. Oreglia, S. Orito, J. Pálinkás, G. Pásztor, J.R. Pater, G.N. Patrick, J. Patt, R. Perez-Ochoa, S. Petzold, P. Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, P. Poffenberger, J. Polok, M. Przybycień, C. Rembser, H. Rick, S. Robertson, S.A. Robins, N. Rodning, J.M. Roney, K. Roscoe, A.M. Rossi, Y. Rozen, K. Runge, O. Runolfsson, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, W.M. Sang, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, F. Scharf, P. Scharff-Hansen, J. Schieck, B. Schmitt, S. Schmitt, A. Schöning, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Sittler, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, M. Sproston, A. Stahl, K. Stephens, J. Steuerer, K. Stoll, D. Strom, R. Ströhmer, B. Surrow, S.D. Talbot, P. Taras, S. Tarem, R. Teuscher, M. Thiergen, J. Thomas, M.A. Thomson, E. von Törne, E. Torrence, S. Towers, I. Trigger, Z. Trócsányi, E. Tsur, A.S. Turcot, M.F. Turner-Watson, I. Ueda, R. Van Kooten, P. Vannerem, M. Verzocchi, H. Voss, F. Wäckerle, A. Wagner, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, N. Wermes, J.S. White, G.W. Wilson, J.A. Wilson, T.R. Wyatt, S. Yamashita, G. Yekutieli, V. Zacek, and D. Zer-Zion
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Hadron, Observable, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Charged particle, 0103 physical sciences, Statistical precision, High Energy Physics::Experiment, Rapidity, Multiplicity (chemistry), 010306 general physics, Boson
Abstract: The predicted effects of final state interactions such as colour reconnection are investigated by measuring properties of hadronic decays of W bosons, recorded at a centre-of-mass energy of sqrt(s)=182.7 GeV in the OPAL detector at LEP. Dependence on the modelling of hadronic W decays is avoided by comparing W+W- -> qqqq events with the non-leptonic component of W+W- -> qqlnu events. The scaled momentum distribution, its mean value, x_p, and that of the charged particle multiplicity, n_ch, are measured and found to be consistent in the two channels. The measured differences are: Diff(x_p) = +0.7 +- 0.8 +- 0.6 and Diff(n_ch) = (-0.09 +- 0.09 +-0.05)*10**-2. In addition, measurements of rapidity and thrust are performed for W+W- -> qqqq events. The data are described well by standard QCD models and disfavour one model of colour reconnection within the ARIADNE program. The current implementation of the ELLIS-GEIGER model of colour reconnection is excluded. At the current level of statistical precision no evidence for colour reconnection effects was found in the observables studied. The predicted effect of colour reconnection on OPAL measurements of M_W is also quantified in the context of models studied.
Published: 1999

44. Search for anomalous photonic events with missing energy in ${\rm e}^+{\rm e}^-$ collisions at $\sqrt{s}$ = 130, 136 and 183 GeV

Author: Sachio Komamiya, A. T. Watson, M. Boutemeur, F. S. Merritt, F. Scharf, T. P. Kokott, J. Letts, T. Saeki, Satoshi Mihara, German Martinez, J. Bechtluft, J. A. McKenna, G. G. Hanson, P. Scharff-Hansen, R. Davis, Randall Sobie, G. D. Lafferty, K. Sachs, S. Betts, M. Hapke, M. Fanti, G. Giacomelli, M. J. Oreglia, I. Lawson, Shlomo Dado, J. R. Carter, G. N. Patrick, A. M. Smith, Dave Charlton, R. Bartoldus, A. De Roeck, W. R. Gibson, H. O. Ogren, Christoph Geich-Gimbel, N. Altekamp, H. Voss, Guenter Duckeck, J. M. Roney, Robert McPherson, J. Grunhaus, S. R. Lautenschlager, K. Stoll, Andris Skuja, D. M. Strom, Gregor Herten, K. Harder, R. J. Barlow, G. Gaycken, P. G. Bright-Thomas, R. D. Heuer, D. J. Miller, Fabrizio Fabbri, D. C. Imrie, Claire Shepherd-Themistocleous, M. Schumacher, S. Petzold, R. Bürgin, O. Runolfsson, R. M. Brown, Lorne Levinson, M. S. Dixit, Frans Meijers, Giora Mikenberg, S. F. Ashby, Koichi Nagai, J. Schieck, Tetsuro Mashimo, Achim Stahl, Vakhtang Kartvelishvili, Paul Kyberd, J. E. Conboy, A. Fürtjes, C. Y. Chang, Ehud Duchovni, W. Mohr, M. Jimack, G. P. Siroli, J. E. Pilcher, F. Odorici, R. Van Kooten, T. R. Junk, A. Biguzzi, A. A. Faust, W. Gorn, P. Taras, F. K. Loebinger, P. S. Wells, Claudio Grandi, J. S. White, Christoph Schwick, A. Michelini, J. Steuerer, J. G. Layter, A. W. Lloyd, Ekg Sarkisyan, R. J. Hemingway, C. Hartmann, S. B. Anderson, D. E. Plane, Terry Richard Wyatt, Gideon Bella, K. Stephens, Stephen Hillier, H. A. Neal, G. M. Dallavalle, Ivor Fleck, G. W. Wilson, Satoshi Tanaka, Joleen Pater, A. D. Schaile, Gabriella Pasztor, M. Hauschild, C. Markopoulos, P. Vannerem, M. A. Thomson, A. Macpherson, H. J. Burckhart, Jacqueline Batley, F. Wäckerle, C. Littlewood, B. W. Kennedy, James Pinfold, R. Perez-Ochoa, R. Seuster, P. Jovanovic, A. Klier, Austin Ball, D. M. Gingrich, T. Kobayashi, E. K. U. Gross, L. Brigliadori, V. Gibson, H. Mes, S. M. Gascon-Shotkin, Peter Krieger, J. Gascon, R. Howard, Stan Bentvelsen, M. Sproston, K. Roscoe, G. A. Snow, C. P. Ward, Alessandro Montanari, D. Lanske, M. F. Turner-Watson, I. Trigger, I. P. Duerdoth, S. Braibant, A. Macchiolo, Peter R Hobson, D. R. Rust, P. E.L. Clarke, Klaus Kurt Desch, E. Torrence, M. Kobel, S. Söldner-Rembold, D. R. Ward, T. Kress, C. M. Hawkes, R. Mir, J. P. Martin, E. Clay, Otmar Biebel, R. Kowalewski, V. Zacek, R. Hawkings, S. W. O'Neale, K. J. Anderson, D. Zer-Zion, O. C. Cooke, P. Hüntemeyer, S. Arcelli, A. M. Lee, P. I. Kayal, Georges Azuelos, P. Pfeifenschneider, T. Kuhl, John Allison, J. W. Gary, Raimund Ströhmer, Norbert Wermes, E. von Törne, Sherry Towers, T. Kawamoto, S. De Jong, E. Tsur, D. S. Koetke, Marcello Mannelli, Richard Teuscher, A. S. Turcot, C. R. Jones, S. Orito, J. Patt, Richard Nisius, A. M. Rossi, André Schöning, P. Poffenberger, M. Fierro, M. Verzocchi, K. W. Bell, H. Rick, O. Sahr, F. G. Oakham, B. List, Marco Cuffiani, F. Fiedler, J. Pálinkás, Kiyotomo Kawagoe, B. Schmitt, E. L. Barberio, Gideon Alexander, Paolo Giacomelli, M. Hansroul, Paolo Capiluppi, J. C. Hill, Beatrix Dienes, C. Burgard, R. J. Homer, R. G. Kellogg, R. L. Coxe, W. J. McDonald, B. C. Shen, A. Hocker, M. Kolrep, Siegfried Bethke, D. Liu, A. K. Honma, D. Chrisman, G. D. Long, K. R. Hossain, Stefano Marcellini, Volker Blobel, W. G. Scott, I. Nakamura, Stephen Lloyd, W. M. Sang, Claudia Ciocca, D. Glenzinski, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, Michael Hildreth, Alain Bellerive, N. L. Rodning, C. Sbarra, F. R. Jacob, Daniele Bonacorsi, J. Lauber, J. von Krogh, S. D. Talbot, M. Gruwé, L. A. del Pozo, T. J. McMahon, C. Couyoumtzelis, J. Dubbert, R. K. Carnegie, M. Herndon, D. Eatough, T. Behnke, M. Bobinski, J. A. Wilson, J. Böhme, D. Lazic, P. Gagnon, G. Yekutieli, M. Przybycień, A. A. Carter, Ron Folman, A. Sittler, Zoltan Laszlo Trocsanyi, Giovanni Abbiendi, S. D. Bird, D. Axen, A. Jawahery, Peter Sherwood, Stefan Schmitt, Alexander Wagner, J. Ludwig, K. Runge, P. Bock, Shoji Asai, P. G. Estabrooks, R. K. Keeler, Daniel Lellouch, N. K. Watson, Takehiko Mori, P. Mättig, P. M. Watkins, I. J. Bloodworth, S. Baumann, Yoram Rozen, E. A. Mckigney, J. Polok, D. Karlen, D. I. Futyan, J. Goldberg, B. Nellen, H. G. Evans, I. Cohen, Christoph Rembser, Erez Etzion, Stefan Kluth, Shlomit Tarem, B. Surrow, S. A. Robins, R. Liebisch, K. Ackerstaff, A. J. Martin, S. Yamashita, P. Igo-Kemenes, K. Ishii, H. Jeremie, W. Mader, O. Schaile, C. K. Hargrove, S. Robertson, Matthias Schröder, Sven Menke, M. Thiergen, and Tara Shears
Subjects: Physics, Particle physics, Missing energy, Physics and Astronomy (miscellaneous), Physics beyond the Standard Model, Standard Model, Nuclear physics, Pair production, Neutralino, High Energy Physics::Experiment, Gravitino, Production (computer science), Engineering (miscellaneous), Energy (signal processing)
Abstract: Photonic events with large missing energy have been observed in $\mathrm e^+e^-$ collisions at centre-of-mass energies of 130, 136 and 183 GeV collected in 1997 using the OPAL detector at LEP. Results are presented for event topologies with a single photon and missing transverse energy or with an acoplanar photon pair. Cross-section measurements are performed within the kinematic acceptance of each selection. These results are compared with the expectations from the Standard Model process ${\rm e}^+{\rm e}^-\to\nu\overline{\nu}$ + photon(s). No evidence is observed for new physics contributions to these final states. Using the data at $\sqrt{s}$ = 183 GeV, upper limits on ${\sigma({\rm e^+e^-}\to{\rm XY})\cdot{\rm BR}(\rm X \to Y \gamma)}$ and ${\sigma({\rm e^+e^-}\to{\rm XX})\cdot{\rm BR}^2(\rm X \to Y \gamma)}$ are derived for the case of stable and invisible Y. These limits apply to single and pair production of excited neutrinos ( $\rm X = \nu^*, Y = \nu$ ), to neutralino production ( $\rm X={{\tilde{\chi}}^{0}}_{2}, Y={{\tilde{\chi}}^{0}}_{1}$ ) and to supersymmetric models in which $\rm X = {{\tilde{\chi}}^{0}}_{1}$ and $\rm Y=\tilde{\mathrm{G}}$ is a light gravitino.
Published: 1999

45. Measurements of flavour-dependent fragmentation functions in ${\bf Z^{0} \rightarrow{\rm q}\bar{\rm q}}$ events

Author: J. von Krogh, R. Bartoldus, G. Yekutieli, M. Przybycień, A. A. Carter, Ron Folman, J. Letts, M. Gruwé, L. A. del Pozo, P. G. Bright-Thomas, K. Stephens, M. Fanti, T. J. McMahon, C. Couyoumtzelis, J. Dubbert, R. K. Carnegie, M. Herndon, Daniel Lellouch, M. Bobinski, C. Y. Chang, J. A. Wilson, J. Böhme, H. O. Ogren, K. Roscoe, M. Schumacher, E. Lefebvre, D. Lazic, Takehiko Mori, P. Mättig, F. Odorici, Randall Sobie, T. Schorner, S. D. Bird, John Allison, Reda Tafirout, Klaus Kurt Desch, G. D. Lafferty, Christoph Geich-Gimbel, S. M. Gascon-Shotkin, Achim Stahl, James Pinfold, R. Perez-Ochoa, R. Seuster, C. Littlewood, V. Gibson, E. Torrence, F. Scharf, K. Sachs, Shlomo Dado, Georges Azuelos, E. Tsur, German Martinez, J. Gascon, T. R. Junk, D. Axen, P. E.L. Clarke, A. Jawahery, Robert McPherson, M. Verzocchi, H. A. Neal, I. Trigger, E. Clay, K. W. Bell, R. G. Kellogg, J. Pálinkás, D. R. Ward, T. Kress, J. C. Hill, J. P. Martin, Dave Charlton, P. G. Estabrooks, Vakhtang Kartvelishvili, Mathieu Doucet, V. Zacek, T. Behnke, W. J. McDonald, Peter Sherwood, R. K. Keeler, B. C. Shen, Stefano Marcellini, M. F. Turner-Watson, J. W. Gary, R. D. Heuer, D. S. Koetke, W. R. Gibson, Stefan Schmitt, Siegfried Bethke, J. E. Conboy, R. Kowalewski, S. De Jong, Marcello Mannelli, Fabrizio Fabbri, M. A. Thomson, A. K. Honma, W. G. Scott, Guenter Duckeck, A. Fürtjes, N. K. Watson, W. M. Sang, Kiyotomo Kawagoe, Peter R Hobson, R. Bürgin, Alexander Wagner, I. Nakamura, E. K. U. Gross, H. Mes, P. Scharff-Hansen, A. M. Rossi, K. Nagai, I. P. Duerdoth, S. Braibant, J. Ludwig, D. Zer-Zion, K. Runge, P. Bock, P. M. Watkins, M. Sproston, A. Macchiolo, O. C. Cooke, Gregor Herten, P. Pfeifenschneider, H. Rick, Shoji Asai, Giora Mikenberg, A. Joly, R. M. Brown, Lorne Levinson, A. M. Smith, S. F. Ashby, K. R. Hossain, D. R. Rust, C. M. Hawkes, D. Glenzinski, J. Patt, André Schöning, K. Stoll, Andris Skuja, M. Boutemeur, F. S. Merritt, I. J. Bloodworth, P. Hüntemeyer, S. B. Anderson, P. Gagnon, S. Petzold, C. Sbarra, Satoshi Mihara, Gideon Alexander, Dezso Horvath, M. J. Losty, F. R. Jacob, Jean-Arcady Meyer, Tetsuro Mashimo, O. Sahr, Paolo Capiluppi, J. Grunhaus, C. Hartmann, D. E. Plane, A. M. Lee, Gideon Bella, A. D. Schaile, W. Gorn, Paul Kyberd, F. K. Loebinger, A. Sittler, Stephen Hillier, E. von Törne, Gabriella Pasztor, J. M. Roney, R. L. Coxe, Zoltan Laszlo Trocsanyi, Richard Nisius, Stan Bentvelsen, M. Fierro, G. M. Dallavalle, Yoram Rozen, H. J. Burckhart, Jacqueline Batley, P. Vannerem, Michael Hildreth, J. Steuerer, Ivor Fleck, Silvia Arcelli, J. Bechtluft, B. List, J. A. McKenna, D. Lui, A. Hocker, Paolo Giacomelli, Joleen Pater, Marco Cuffiani, Richard Teuscher, G. A. Snow, A. Klier, A. S. Turcot, F. Fiedler, D. Chrisman, G. D. Long, M. Hansroul, Ekg Sarkisyan, C. P. Ward, Sachio Komamiya, N. L. Rodning, R. Van Kooten, Theodoros Geralis, J. Lauber, J. Schieck, Volker Blobel, A. T. Watson, W. Mohr, G. G. Hanson, C. Burgard, S. Söldner-Rembold, B. Poli, R. J. Homer, T. P. Kokott, Stephen Lloyd, T. Saeki, G. Giacomelli, I. Lawson, F. Wäckerle, S. D. Talbot, J. E. Pilcher, D. M. Gingrich, Alessandra Fanfani, R. Davis, Claire Shepherd-Themistocleous, Ehud Duchovni, S. Baumann, J. Polok, A. De Roeck, M. Kobel, D. Karlen, M. Kolrep, D. Eatough, M. Jimack, C. R. Jones, G. W. Wilson, A. Michelini, H. M. Fischer, E. A. Mckigney, M. S. Dixit, D. C. Imrie, P. Vikas, A. A. Faust, Frans Meijers, Satoshi Tanaka, T. Kobayashi, D. Lanske, S. Betts, M. Hapke, G. P. Siroli, S. R. Lautenschlager, A. Biguzzi, J. G. Layter, Christoph Schwick, Claudia Ciocca, O. Runolfsson, D. I. Futyan, Claudio Grandi, M. J. Oreglia, A. W. Lloyd, S. Yamashita, P. Igo-Kemenes, S. A. Robins, K. Ishii, H. Jeremie, M. Hauschild, C. Markopoulos, R. Liebisch, K. Ackerstaff, J. R. Carter, G. N. Patrick, O. Schaile, Otmar Biebel, S. Robertson, P. Taras, Raimund Ströhmer, P. Poffenberger, Beatrix Dienes, Sven Menke, S. W. O'Neale, K. J. Anderson, P. I. Kayal, Erez Etzion, Stefan Kluth, Shlomit Tarem, Norbert Wermes, Sherry Towers, T. Kawamoto, S. Orito, J. Goldberg, B. Nellen, H. G. Evans, I. Cohen, Christoph Rembser, P. S. Wells, Terry Richard Wyatt, A. Macpherson, A. J. Martin, C. K. Hargrove, Tara Shears, R. Howard, R. Mir, R. Hawkings, J. S. White, Matthias Schröder, M. Thiergen, D. M. Strom, F. G. Oakham, B. Schmitt, E. L. Barberio, N. Altekamp, H. Voss, R. J. Barlow, D. J. Miller, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, and Alessandro Montanari
Subjects: Quark, Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, 010308 nuclear & particles physics, High Energy Physics::Lattice, Electron–positron annihilation, High Energy Physics::Phenomenology, Flavour, 01 natural sciences, Bottom quark, Charged particle, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Charm (quantum number), 010306 general physics, Maxima, Engineering (miscellaneous)
Abstract: Fragmentation functions for charged particles in ${\rm Z}^0 \rightarrow {\rm q}\bar{\rm q}$ events have been measured for bottom (b), charm (c) and light (uds) quarks as well as for all flavours together. The results are based on data recorded between 1990 and 1995 using the OPAL detector at LEP. Event samples with different flavour compositions were formed using reconstructed ${\rm D}^{*\pm}$ mesons and secondary vertices. The $\xi_{\rm p} =\ln(1/x_{\rm p})$ distributions and the position of their maxima $\xi_0$ are also presented separately for uds, c and b quark events. The fragmentation function for b quarks is significantly softer than for uds quarks.
Published: 1999

46. Search for baryon and lepton number violating Z0 decays

Author: G. Abbiendi, K. Ackerstaff, G. Alexander, J. Allison, N. Altekamp, K.J. Anderson, S. Anderson, S. Arcelli, S. Asai, S.F. Ashby, D. Axen, G. Azuelos, A.H. Ball, E. Barberio, R.J. Barlow, R. Bartoldus, J.R. Batley, S. Baumann, J. Bechtluft, T. Behnke, K.W. Bell, G. Bella, A. Bellerive, S. Bentvelsen, S. Bethke, S. Betts, O. Biebel, A. Biguzzi, S.D. Bird, V. Blobel, I.J. Bloodworth, P. Bock, J. Böhme, D. Bonacorsi, M. Boutemeur, S. Braibant, P. Bright-Thomas, L. Brigliadori, R.M. Brown, H.J. Burckhart, P. Capiluppi, R.K. Carnegie, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, D. Chrisman, C. Ciocca, P.E.L. Clarke, E. Clay, I. Cohen, J.E. Conboy, O.C. Cooke, C. Couyoumtzelis, R.L. Coxe, M. Cuffiani, S. Dado, G.M. Dallavalle, R. Davis, S. De Jong, A. de Roeck, P. Dervan, K. Desch, B. Dienes, M.S. Dixit, J. Dubbert, E. Duchovni, G. Duckeck, I.P. Duerdoth, D. Eatough, P.G. Estabrooks, E. Etzion, F. Fabbri, M. Fanti, A.A. Faust, F. Fiedler, M. Fierro, I. Fleck, R. Folman, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, J. Gascon, S.M. Gascon-Shotkin, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, V. Gibson, W.R. Gibson, D.M. Gingrich, D. Glenzinski, J. Goldberg, W. Gorn, C. Grandi, K. Graham, E. Gross, J. Grunhaus, M. Gruwé, G.G. Hanson, M. Hansroul, M. Hapke, K. Harder, A. Harel, C.K. Hargrove, C. Hartmann, M. Hauschild, C.M. Hawkes, R. Hawkings, R.J. Hemingway, M. Herndon, G. Herten, R.D. Heuer, M.D. Hildreth, J.C. Hill, P.R. Hobson, M. Hoch, A. Hocker, K. Hoffman, R.J. Homer, A.K. Honma, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, D.C. Imrie, K. Ishii, F.R. Jacob, A. Jawahery, H. Jeremie, M. Jimack, C.R. Jones, P. Jovanovic, T.R. Junk, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, P.I. Kayal, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, D.H. Kim, A. Klier, S. Kluth, T. Kobayashi, M. Kobel, D.S. Koetke, T.P. Kokott, M. Kolrep, S. Komamiya, R.V. Kowalewski, T. Kress, P. Krieger, J. von Krogh, T. Kuhl, P. Kyberd, G.D. Lafferty, H. Landsman, D. Lanske, J. Lauber, S.R. Lautenschlager, I. Lawson, J.G. Layter, D. Lazic, A.M. Lee, D. Lellouch, J. Letts, L. Levinson, R. Liebisch, B. List, C. Littlewood, A.W. Lloyd, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Ludwig, D. Liu, A. Macchiolo, A. Macpherson, W. Mader, M. Mannelli, S. Marcellini, C. Markopoulos, A.J. Martin, J.P. Martin, G. Martinez, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, E.A. Mckigney, T.J. McMahon, R.A. McPherson, F. Meijers, S. Menke, F.S. Merritt, H. Mes, J. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D.J. Miller, R. Mir, W. Mohr, A. Montanari, T. Mori, K. Nagai, I. Nakamura, H.A. Neal, B. Nellen, R. Nisius, S.W. O'Neale, F.G. Oakham, F. Odorici, H.O. Ogren, M.J. Oreglia, S. Orito, J. Pálinkás, G. Pásztor, J.R. Pater, G.N. Patrick, J. Patt, R. Perez-Ochoa, S. Petzold, P. Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, P. Poffenberger, J. Polok, M. Przybycień, C. Rembser, H. Rick, S. Robertson, S.A. Robins, N. Rodning, J.M. Roney, K. Roscoe, A.M. Rossi, Y. Rozen, K. Runge, O. Runolfsson, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, W.M. Sang, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, F. Scharf, P. Scharff-Hansen, J. Schieck, B. Schmitt, S. Schmitt, A. Schöning, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Sittler, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, M. Sproston, A. Stahl, K. Stephens, J. Steuerer, K. Stoll, D. Strom, R. Ströhmer, B. Surrow, S.D. Talbot, S. Tanaka, P. Taras, S. Tarem, R. Teuscher, M. Thiergen, J. Thomas, M.A. Thomson, E. von Törne, E. Torrence, S. Towers, I. Trigger, Z. Trócsányi, E. Tsur, A.S. Turcot, M.F. Turner-Watson, I. Ueda, R. Van Kooten, P. Vannerem, M. Verzocchi, H. Voss, F. Wäckerle, A. Wagner, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, N. Wermes, J.S. White, G.W. Wilson, J.A. Wilson, T.R. Wyatt, S. Yamashita, G. Yekutieli, V. Zacek, and D. Zer-Zion
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Detector, FOS: Physical sciences, Fizikai tudományok, Charge (physics), 01 natural sciences, Lepton number, High Energy Physics - Experiment, Baryon, High Energy Physics - Experiment (hep-ex), Természettudományok, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment, Conjugate
Abstract: Using data collected with the OPAL detector at LEP, we have searched for the processes e+e- -> Z0 -> p e-, p mu- and the charge conjugate final-states. These would violate the conservation of the baryon-number B, lepton-number L and the fermion-number n = (B+L). No evidence for such decays has been found, and the 95% confidence level upper limits on the partial widths Z0 -> p e and Z0 -> p mu are found to be 4.6 and 4.4 keV respectively., 16 pages, LaTeX, 2 ps figs included, submitted to Physics Letters B
Published: 1999

47. A measurement of the τ→ν branching ratio

Author: S. M. Gascon-Shotkin, P. Poffenberger, A. D. Schaile, Gabriella Pasztor, John Allison, G. Gaycken, P. G. Bright-Thomas, J. Lauber, Erez Etzion, G. Yekutieli, A. J. Martin, M. Przybycień, Stefan Kluth, Shlomit Tarem, Beatrix Dienes, M. Schumacher, P. Gagnon, P. Vannerem, S. D. Talbot, A. Sittler, Zoltan Laszlo Trocsanyi, Dong Hee Kim, T. Kress, Daniel Lellouch, R. G. Kellogg, A. M. Rossi, A. A. Carter, Ron Folman, D. Eatough, Takehiko Mori, F. Odorici, B. Surrow, G. A. Snow, C. P. Ward, T. Behnke, W. Mader, Stefano Marcellini, S. D. Bird, P. Mättig, C. K. Hargrove, S. Söldner-Rembold, H. A. Neal, D. Axen, A. Jawahery, M. Fanti, C. Y. Chang, S. A. Robins, P. G. Estabrooks, R. K. Keeler, D. C. Imrie, Dave Charlton, Claire Shepherd-Themistocleous, Peter Sherwood, Alexander Wagner, Giovanni Abbiendi, J. Ludwig, K. Runge, P. Bock, N. K. Watson, Matthias Schröder, P. Taras, Paul Kyberd, F. K. Loebinger, K. Hoffman, R. Liebisch, K. Ackerstaff, J. Steuerer, T. R. Junk, G. P. Siroli, E. Tsur, Ivor Fleck, M. Thiergen, S. R. Lautenschlager, Stefan Schmitt, P. S. Wells, P. M. Watkins, T. J. McMahon, M. Verzocchi, K. W. Bell, Joleen Pater, C. Couyoumtzelis, A. Klier, Christoph Schwick, R. J. Hemingway, J. Pálinkás, S. B. Anderson, M. Boutemeur, F. S. Merritt, A. A. Faust, R. D. Heuer, J. Dubbert, R. K. Carnegie, K. Sachs, M. Herndon, James Pinfold, R. Perez-Ochoa, R. Seuster, Terry Richard Wyatt, J. C. Hill, Robert McPherson, Christopher Hawkes, J. A. Wilson, J. Böhme, Shoji Asai, W. M. Sang, Shlomo Dado, L. Brigliadori, O. Runolfsson, Claudia Ciocca, B. W. Kennedy, P. Jovanovic, Gideon Bella, I. J. Bloodworth, Gregor Herten, W. J. McDonald, B. C. Shen, J. Gascon, S. Baumann, D. Lazic, K. Graham, H. J. Burckhart, Jacqueline Batley, A. Macpherson, Tara Shears, Daniele Bonacorsi, Fabrizio Fabbri, Giora Mikenberg, J. Goldberg, Siegfried Bethke, D. Liu, A. K. Honma, E. A. Mckigney, Austin Ball, Yoram Rozen, J. Bechtluft, J. A. McKenna, Peter Krieger, V. Zacek, Claudio Grandi, W. G. Scott, Michael Hildreth, B. Nellen, Stan Bentvelsen, C. Sbarra, G. Azuelos, F. R. Jacob, S. F. Ashby, I. Nakamura, J. S. White, Ekg Sarkisyan, R. Van Kooten, Kiyotomo Kawagoe, J. E. Pilcher, J. W. Gary, N. L. Rodning, D. S. Koetke, A. Macchiolo, J. von Krogh, S. W. O'Neale, J. Letts, Marcello Mannelli, R. Bartoldus, P. Dervan, J. Polok, D. Karlen, Alessandro Montanari, D. Glenzinski, H. Mes, I. P. Duerdoth, A. W. Lloyd, H. O. Ogren, K. J. Anderson, C. R. Jones, K. Stoll, Andris Skuja, S. Petzold, Dezso Horvath, M. J. Losty, M. Gruwé, D. I. Futyan, Christoph Geich-Gimbel, R. Howard, Jean-Arcady Meyer, G. W. Wilson, Tetsuro Mashimo, T. Kuhl, Richard Nisius, M. F. Turner-Watson, M. Hauschild, C. Markopoulos, F. Wäckerle, S. Braibant, A. Bellerive, B. List, Vakhtang Kartvelishvili, R. Mir, D. M. Gingrich, Randall Sobie, G. D. Lafferty, Marco Cuffiani, J. E. Conboy, A. Fürtjes, K. R. Hossain, W. Gorn, I. Cohen, R. Hawkings, Christoph Rembser, D. Lanske, A. Harel, P. Hüntemeyer, Ikuo Ueda, D. M. Strom, P. Scharff-Hansen, H. Landsman, D. R. Rust, A. M. Smith, Guenter Duckeck, M. Fierro, A. M. Lee, Richard Teuscher, A. S. Turcot, E. von Törne, F. Fiedler, M. Kolrep, F. G. Oakham, B. Schmitt, E. L. Barberio, N. Altekamp, H. Voss, R. J. Barlow, D. J. Miller, S. Spagnolo, S. Yamashita, P. Igo-Kemenes, M. Hoch, K. Ishii, H. Jeremie, O. Schaile, S. Robertson, Sven Menke, Ehud Duchovni, M. Jimack, A. Michelini, Satoshi Tanaka, T. Kobayashi, Peter R Hobson, J. M. Roney, R. L. Coxe, D. Zer-Zion, Sachio Komamiya, A. T. Watson, A. Hocker, Koichi Nagai, J. Schieck, D. Chrisman, G. D. Long, T. P. Kokott, W. Mohr, Volker Blobel, Achim Stahl, T. Saeki, R. Davis, Stephen Lloyd, J. Grunhaus, R. Kowalewski, S. Arcelli, F. Scharf, German Martinez, Juergen Thomas, A. Biguzzi, J. G. Layter, Gideon Alexander, M. A. Thomson, Paolo Capiluppi, P. E.L. Clarke, J. P. Martin, E. K. U. Gross, S. De Jong, H. Rick, M. Sproston, G. G. Hanson, G. Giacomelli, I. Lawson, K. Stephens, A. De Roeck, M. Kobel, C. Littlewood, M. S. Dixit, Frans Meijers, O. C. Cooke, P. Pfeifenschneider, V. Gibson, I. Trigger, D. R. Ward, J. Patt, André Schöning, O. Sahr, Satoshi Mihara, Otmar Biebel, Paolo Giacomelli, M. Hansroul, R. J. Homer, P. I. Kayal, Norbert Wermes, Sherry Towers, T. Kawamoto, W. R. Gibson, S. Orito, K. Harder, S. Betts, M. Hapke, M. J. Oreglia, J. R. Carter, G. N. Patrick, R. M. Brown, Lorne Levinson, C. Hartmann, D. E. Plane, G. M. Dallavalle, K. Roscoe, Klaus Kurt Desch, E. Torrence, E. Clay, and Raimund Ströhmer
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Electron energy spectrum, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, 0103 physical sciences, Strong coupling, Analytical chemistry, Mass scale, 010306 general physics, 01 natural sciences
Abstract: The branching ratio for the decay τ − → e − ν e ν τ has been measured using Z 0 decay data collected by the OPAL experiment at LEP. In total 33 073 τ − → e − ν e ν τ candidates were identified from a sample of 186 197 selected τ decays, giving a branching ratio of B (τ − → e − ν e ν τ )=(17.81±0.09 (stat) ±0.06 (syst) )% . This result is combined with other measurements to test e - μ and μ - τ universality in charged-current weak interactions. Additionally, the strong coupling constant α s ( m τ 2 ) has been extracted from B (τ − → e − ν e ν τ ) and evolved to the Z 0 mass scale, giving α s ( m Z 2 )=0.1204±0.0011 (exp)±0.0019 (theory).
Published: 1999

48. Search for scalar top and scalar bottom quarks at $\sqrt{s}$ = 183 GeV at LEP

Author: S. Petzold, W. J. McDonald, B. C. Shen, Tetsuro Mashimo, Matthias Schröder, K. Nagai, K. Stephens, R. Bartoldus, Siegfried Bethke, A. K. Honma, W. G. Scott, M. Thiergen, I. Nakamura, H. O. Ogren, W. Gorn, Christoph Geich-Gimbel, D. R. Rust, D. Glenzinski, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, V. Gibson, A. M. Lee, E. von Törne, S. Yamashita, P. Igo-Kemenes, K. Ishii, H. Jeremie, Vakhtang Kartvelishvili, T. R. Junk, J. E. Conboy, A. Fürtjes, I. Trigger, D. R. Ward, T. Kress, R. W. Springer, R. Van Kooten, M. Boutemeur, F. S. Merritt, S. Braibant, Georges Azuelos, E. Tsur, A. D. Schaile, Gabriella Pasztor, J. Bechtluft, J. A. McKenna, O. Schaile, M. Verzocchi, K. W. Bell, S. B. Anderson, P. Szymanski, J. Pálinkás, M. Schumacher, F. Wäckerle, E. Lefebvre, G. Yekutieli, E. do Couto e Silva, S. Robertson, Gregor Herten, J. C. Hill, U. Jost, R. Mir, R. Hawkings, B. Wilkens, D. M. Gingrich, Sven Menke, J. Lauber, S. D. Talbot, D. Eatough, A. A. Carter, Ron Folman, F. Odorici, G. A. Snow, C. P. Ward, C. Hartmann, D. E. Plane, J. E. Pilcher, R. Lahmann, Stephen Hillier, Stan Bentvelsen, G. M. Dallavalle, S. Söldner-Rembold, L. Brigliadori, U. Müller, A. J. Martin, D. C. Imrie, P. Utzat, U. Ruppel, N. J. Oldershaw, John Allison, G. P. Siroli, P. G. Estabrooks, R. K. Keeler, M. R. Ingram, Christoph Schwick, H. M. Fischer, N. K. Watson, P. M. Watkins, W. R. Gibson, J. M. Roney, C. K. Hargrove, M. Fanti, B. T. Bouwens, Daniele Bonacorsi, R. G. Kellogg, James Pinfold, R. Perez-Ochoa, D. G. Fong, J. Gascon, J. Letts, Gideon Alexander, Paolo Capiluppi, Kiyotomo Kawagoe, Claire Shepherd-Themistocleous, R. M. Brown, Lorne Levinson, Csaba Hajdu, Robert McPherson, G. W. Wilson, P. S. Wells, V. Zacek, Richard Teuscher, Stefano Marcellini, A. Skillman, A. S. Turcot, M. Hauschild, K. Sachs, Mathieu Doucet, Tara Shears, R. D. Heuer, Fabrizio Fabbri, F. Fiedler, J. von Krogh, C. Markus, A. A. Faust, H. Mes, I. P. Duerdoth, Terry Richard Wyatt, Shlomo Dado, J. W. Gary, P. A. Hart, J. Schieck, D. S. Koetke, Stefan Kluth, Marcello Mannelli, Otmar Biebel, Silvia Arcelli, J. E. Bloomer, G. T. Jones, E. H. Vokurka, K. R. Hossain, T. Behnke, Satoshi Mihara, L. A. del Pozo, P. Scharff-Hansen, W. Mohr, Shlomit Tarem, S. Baumann, P. Hüntemeyer, Reda Tafirout, Klaus Kurt Desch, T. J. McMahon, M. J. Pearce, F. G. Oakham, Giora Mikenberg, B. Schmitt, M. Kolrep, B. Stockhausen, Paul Kyberd, E. A. Mckigney, A. Macchiolo, E. L. Barberio, R. K. Carnegie, A. Posthaus, D. Chrisman, G. D. Long, F. K. Loebinger, Hans-Christian Schultz-Coulon, M. Herndon, Volker Blobel, Randall Sobie, M. Gruwé, M. Bobinski, P. I. Kayal, G. D. Lafferty, C. M. Hawkes, W. P. Lai, J. A. Wilson, A. M. Smith, C. Dallapiccola, J. Steuerer, Ivor Fleck, Richard Nisius, S. W. O'Neale, Guenter Duckeck, D. M. Strom, K. J. Anderson, Marco Cuffiani, Joleen Pater, Norbert Wermes, Sherry Towers, T. Kawamoto, D. Lazic, M. A. Thomson, A. Klier, E. K. U. Gross, N. Altekamp, H. Voss, Stephen Lloyd, R. Rylko, R. Giacomelli, S. Orito, O. C. Cooke, P. Pfeifenschneider, M. Sproston, D. I. Futyan, R. J. Barlow, D. J. Miller, J. Goldberg, M. Hapke, B. Nellen, A. Oh, A. Macpherson, N. I. Geddes, Michael Hildreth, J. Patt, P. Poffenberger, D. E. Hutchcroft, André Schöning, Ehud Duchovni, N. L. Rodning, M. J. Oreglia, H. G. Evans, B. Poli, M. J. Goodrick, R. Howard, J. S. White, I. Cohen, S. A. Robins, D. L. Rees, J. R. Carter, G. N. Patrick, M. Jimack, Paolo Giacomelli, M. Hansroul, Gunter Wolf, K. Ackerstaff, D. Rigby, R. J. Hemingway, A. Joly, F. Scharf, German Martinez, Beatrix Dienes, S. M. Gascon-Shotkin, C. Burgard, C. Sbarra, R. J. Homer, A. Michelini, Matthew Evans, A. M. Rossi, C. Y. Chang, P. Taras, Michael Kobel, Allen Mincer, Satoshi Tanaka, T. Kobayashi, B. W. Kennedy, Julie Kirk, Ekg Sarkisyan, P. Jovanovic, P. W. Jeffreys, Austin Ball, Peter Krieger, P. Vikas, Alessandro Montanari, D. Lanske, M. Fierro, J. E.G. Edwards, S. R. Lautenschlager, H. A. Neal, O. Runolfsson, C. Beeston, Claudio Grandi, G. G. Hanson, G. Giacomelli, M. S. Dixit, Frans Meijers, A. Biguzzi, A. Rooke, J. G. Layter, P. E.L. Clarke, M. K. Jones, J. P. Martin, S. De Jong, A. N. Bell, P. Gagnon, A. Sittler, Peter Schleper, Zoltan Laszlo Trocsanyi, S. D. Bird, P. Schenk, D. Axen, A. Jawahery, Peter Sherwood, Alexander Wagner, J. Ludwig, K. Runge, P. Bock, Gideon Bella, H. J. Burckhart, Jacqueline Batley, Sachio Komamiya, Theodoros Geralis, E. Ros, A. T. Watson, I. J. Bloodworth, C. R. Jones, T. P. Kokott, Dave Charlton, R. Bürgin, T. Saeki, Yoram Rozen, R. Davis, M. Foucher, J. Grunhaus, D. Karlen, M. F. Turner-Watson, M. Morii, Peter R Hobson, Stefan Schmitt, D. Zer-Zion, P. Routenburg, P. Mättig, Shoji Asai, Daniel Lellouch, Takehiko Mori, K. Stoll, and Andris Skuja
Subjects: Physics, Stop squark, Top quark, Particle physics, Physics and Astronomy (miscellaneous), High Energy Physics::Lattice, High Energy Physics::Phenomenology, Top quark condensate, Bottom quark, Nuclear physics, Quark star, Neutralino, Up quark, High Energy Physics::Experiment, B meson, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: Searches for a scalar top quark and a scalar bottom quark have been performed using a total data sample of 56.8 pb-1 at a centre-of-mass energy of 183 GeV collected with the OPAL detector at LEP. No candidate events were observed. Combining this result with those obtained at lower centre-of-mass energies, the 95% C.L. lower limit on the scalar top quark mass is 85.0 GeV if the mixing angle between the supersymmetric partners of the left- and right-handed states of the top quark is zero. The lower limit is 81.3 GeV, even if the scalar top quark decouples from the Z boson. These limits were obtained assuming that the scalar top quark decays into a charm quark and the lightest neutralino, and that the mass difference between the scalar top quark and the lightest neutralino is larger than 10 GeV. Assuming a relatively light scalar neutrino, The complementary decay mode of the scalar top quark in which it decays into a bottom quark, a charged lepton and a scalar neutrino was also studied. From a similar analysis, a mass limit on the light scalar bottom quark was set at 82.7 GeV for a mass difference between the scalar bottom quark and the lightest neutralino larger than 7 GeV, and at 84.0 GeV for the mass difference larger 10 GeV and the lightest neutralino heavier than 30 GeV. These limits were obtained assuming that the scalar bottom quark decays into a bottom quark and the lightest neutralino, and that a mixing angle between the supersymmetric partners of the left- and right-handed states of the bottom quark is zero. Searches for a scalar top quark and a scalar bottom quark have been performed using a total data sample of 56.8 pb-1 at a centre-of-mass energy of 183 GeV collected with the OPAL detector at LEP. No candidate events were observed. Combining this result with those obtained at lower centre-of-mass energies, the 95% C.L. lower limit on the scalar top quark mass is 85.0 GeV if the mixing angle between the supersymmetric partners of the left- and right-handed states of the top quark is zero. The lower limit is 81.3 GeV, even if the scalar top quark decouples from the Z boson. These limits were obtained assuming that the scalar top quark decays into a charm quark and the lightest neutralino, and that the mass difference between the scalar top quark and the lightest neutralino is larger than 10 GeV. Assuming a relatively light scalar neutrino, The complementary decay mode of the scalar top quark in which it decays into a bottom quark, a charged lepton and a scalar neutrino was also studied. From a similar analysis, a mass limit on the light scalar bottom quark was set at 82.7 GeV for a mass difference between the scalar bottom quark and the lightest neutralino larger than 7 GeV, and at 84.0 GeV for the mass difference larger 10 GeV and the lightest neutralino heavier than 30 GeV. These limits were obtained assuming that the scalar bottom quark decays into a bottom quark and the lightest neutralino, and that a mixing angle between the supersymmetric partners of the left- and right-handed states of the bottom quark is zero.
Published: 1999

49. Development of a large-area aerogel Čherenkov counter onboard BESS

Author: Koji Yoshimura, K. Abe, Yoichi Asaoka, S. Orito, M. Fujikawa, and Masaya Ishino
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photomultiplier, Spectrometer, Physics::Instrumentation and Detectors, business.industry, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Aerogel, High Energy Physics - Experiment, Magnetic field, High Energy Physics - Experiment (hep-ex), Optics, Rigidity (electromagnetism), Antiproton, business, Instrumentation, Refractive index, Cherenkov radiation
Abstract: This paper describes the development of a threshold type aerogel Cherenkov counter with a large sensitive area of 0.6 m$^2$ to be carried onboard the BESS rigidity spectrometer to detect cosmic-ray antiprotons. The design incorporates a large diffusion box containing 46 finemesh photomultipliers, with special attention being paid to achieving good performance under a magnetic field and providing sufficient endurance while minimizing material usage. The refractive index of the aerogel was chosen to be 1.03. By utilizing the muons and protons accumulated during the cosmic-ray measurements at sea level, a rejection factor of 10$^4$ was obtained against muons with $\beta \approx 1$, while keeping 97% efficiency for protons below the threshold., Comment: 13 pages, LaTex, 9 eps figures included, submitted to NIM A
Published: 1998

50. Multi-photon production in e+e− collisions at =183 GeV

Author: K. Ackerstaff, G. Alexander, J. Allison, N. Altekamp, K.J. Anderson, S. Anderson, S. Arcelli, S. Asai, S.F. Ashby, D. Axen, G. Azuelos, A.H. Ball, E. Barberio, R.J. Barlow, R. Bartoldus, J.R. Batley, S. Baumann, J. Bechtluft, T. Behnke, K.W. Bell, G. Bella, S. Bentvelsen, S. Bethke, S. Betts, O. Biebel, A. Biguzzi, S.D. Bird, V. Blobel, I.J. Bloodworth, M. Bobinski, P. Bock, J. Böhme, M. Boutemeur, S. Braibant, P. Bright-Thomas, R.M. Brown, H.J. Burckhart, C. Burgard, R. Bürgin, P. Capiluppi, R.K. Carnegie, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, D. Chrisman, C. Ciocca, P.E.L. Clarke, E. Clay, I. Cohen, J.E. Conboy, O.C. Cooke, C. Couyoumtzelis, R.L. Coxe, M. Cuffiani, S. Dado, G.M. Dallavalle, R. Davis, S. De Jong, L.A. del Pozo, A. de Roeck, K. Desch, B. Dienes, M.S. Dixit, M. Doucet, J. Dubbert, E. Duchovni, G. Duckeck, I.P. Duerdoth, D. Eatough, P.G. Estabrooks, E. Etzion, H.G. Evans, F. Fabbri, A. Fanfani, M. Fanti, A.A. Faust, F. Fiedler, M. Fierro, H.M. Fischer, I. Fleck, R. Folman, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, J. Gascon, S.M. Gascon-Shotkin, C. Geich-Gimbel, T. Geralis, G. Giacomelli, P. Giacomelli, V. Gibson, W.R. Gibson, D.M. Gingrich, D. Glenzinski, J. Goldberg, W. Gorn, C. Grandi, E. Gross, J. Grunhaus, M. Gruwé, G.G. Hanson, M. Hansroul, M. Hapke, C.K. Hargrove, C. Hartmann, M. Hauschild, C.M. Hawkes, R. Hawkings, R.J. Hemingway, M. Herndon, G. Herten, R.D. Heuer, M.D. Hildreth, J.C. Hill, S.J. Hillier, P.R. Hobson, A. Hocker, R.J. Homer, A.K. Honma, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, D.C. Imrie, K. Ishii, F.R. Jacob, A. Jawahery, H. Jeremie, M. Jimack, A. Joly, C.R. Jones, P. Jovanovic, T.R. Junk, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, P.I. Kayal, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, A. Klier, S. Kluth, T. Kobayashi, M. Kobel, D.S. Koetke, T.P. Kokott, M. Kolrep, S. Komamiya, R.V. Kowalewski, T. Kress, P. Krieger, J. von Krogh, P. Kyberd, G.D. Lafferty, D. Lanske, J. Lauber, S.R. Lautenschlager, I. Lawson, J.G. Layter, D. Lazic, A.M. Lee, E. Lefebvre, D. Lellouch, J. Letts, L. Levinson, R. Liebisch, B. List, C. Littlewood, A.W. Lloyd, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Ludwig, D. Liu, A. Macchiolo, A. Macpherson, M. Mannelli, S. Marcellini, C. Markopoulos, A.J. Martin, J.P. Martin, G. Martinez, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, E.A. Mckigney, T.J. McMahon, R.A. McPherson, F. Meijers, S. Menke, F.S. Merritt, H. Mes, J. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D.J. Miller, R. Mir, W. Mohr, A. Montanari, T. Mori, K. Nagai, I. Nakamura, H.A. Neal, B. Nellen, R. Nisius, S.W. O'Neale, F.G. Oakham, F. Odorici, H.O. Ogren, M.J. Oreglia, S. Orito, J. Pálinkás, G. Pásztor, J.R. Pater, G.N. Patrick, J. Patt, R. Perez-Ochoa, S. Petzold, P. Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, P. Poffenberger, B. Poli, J. Polok, M. Przybycień, C. Rembser, H. Rick, S. Robertson, S.A. Robins, N. Rodning, J.M. Roney, K. Roscoe, A.M. Rossi, Y. Rozen, K. Runge, O. Runolfsson, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, W.M. Sang, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, F. Scharf, P. Scharff-Hansen, J. Schieck, B. Schmitt, S. Schmitt, A. Schöning, T. Schorner, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Sittler, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, M. Sproston, A. Stahl, K. Stephens, J. Steuerer, K. Stoll, D. Strom, R. Ströhmer, R. Tafirout, S.D. Talbot, S. Tanaka, P. Taras, S. Tarem, R. Teuscher, M. Thiergen, M.A. Thomson, E. von Törne, E. Torrence, S. Towers, I. Trigger, Z. Trócsányi, E. Tsur, A.S. Turcot, M.F. Turner-Watson, R. Van Kooten, P. Vannerem, M. Verzocchi, P. Vikas, H. Voss, F. Wäckerle, A. Wagner, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, N. Wermes, J.S. White, G.W. Wilson, J.A. Wilson, T.R. Wyatt, S. Yamashita, G. Yekutieli, V. Zacek, and D. Zer-Zion
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Photon, 010308 nuclear & particles physics, Branching fraction, Astrophysics::High Energy Astrophysical Phenomena, Resonance, Lambda, 01 natural sciences, 7. Clean energy, Excited state, 0103 physical sciences, High Energy Physics::Experiment, Invariant mass, 010306 general physics, Energy (signal processing)
Abstract: The process e+e- to gamma gamma (gamma) is studied using data recorded with the OPAL detector at LEP. The data sample corresponds to a total integrated luminosity of 56.2 pb-1 taken at a centre-of-mass energy of 183 GeV. The measured cross-section agrees well with the expectation from QED. A fit to the angular distribution is used to obtain improved limits at 95% CL on the QED cut-off parameters: Lambda+ > 233 GeV and Lambda- > 265 GeV as well as a mass limit for an excited electron, M(e*) > 227 GeV assuming equal e*egamma and eegamma couplings. No evidence for resonance production is found in the invariant mass spectrum of photon pairs. Limits are obtained for the cross-section times branching ratio for a resonance decaying into two photons.
Published: 1998

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