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136 results on '"B. Lorazo"'

101. Validity of the Talmi's mass formula for single closed shell nuclei

Author

R. Arvieu and B. Lorazo

Subjects
Physics, Mass formula, Nuclear physics, Nuclear and High Energy Physics, Semi-empirical mass formula, Nuclear Theory, Shell (structure), Nuclear shell model, Nuclear force, Nuclear binding energy, Nucleon, Open shell, Mathematical physics
Abstract

A quadratic mass formula proposed by Talmi for identical nucleons in an open and non degenerate shell is discussed. Corrections coming from the breaking of generalized seniority are examined.

Published
1974

102. Parameter-dependent quasispin group

Author

B Lorazo

Subjects
Physics, Formalism (philosophy of mathematics), Quantum mechanics, Isotopes of tin, Nuclear structure, General Physics and Astronomy, Physics::Atomic Physics, BCS theory, Multiplet, Parameter dependent, Identical particles
Abstract

A nonconventional generalization of the quasispin formalism for N identical particles is presented. The generators S + = Σ i p i S + i , S − = Σ i p i −1 S − i , S z = Σ i S z i of this quasispin group depend on the dynamical parameters p i . This parameter-dependent quasispin group appears as a deformation of the conventional quasispin group ( p i = 1). With such a definition of the quasispin group, the 2n -projection S + n |0> of the BCS state is seen to be an exact generalized seniority zero state. More precisely, this dynamical quasispin group provides the mathematical framework to discuss the earlier generalization of Talmi et al. Theoretical and numerical calculations of the generalized seniority zero multiplet have been carried out for the nickel and tin isotopes.

Published
1975

103. Beta decays and related processes in theA=14nuclei

Author

B. Lorazo, H. Primakoff, B. Goulard, and J.D. Vergados

Subjects
Physics, Nuclear and High Energy Physics, Crystallography, High Energy Physics::Phenomenology, Axial current, Elementary particle, Ground state
Abstract

We present an analysis of the processes $^{14}\mathrm{C}(^{14}\mathrm{O})\ensuremath{\rightarrow}^{14}\mathrm{N}+{e}^{\ensuremath{-}}({e}^{+})+{\overline{\ensuremath{\nu}}}_{e}({\ensuremath{\nu}}_{e})$ and ${\ensuremath{\mu}}^{\ensuremath{-}}+^{14}\mathrm{N}\ensuremath{\rightarrow}{\ensuremath{\nu}}_{\ensuremath{\mu}}+^{14}\mathrm{C}$ (ground state) on the basis of an "elementary particle" treatment and of a "microscopic" treatment including the nucleons-only impulse approximation and the meson exchange. The elementary particle treatment in conjunction with data on ${e}^{\ensuremath{-}}+^{14}\mathrm{N}\ensuremath{\rightarrow}{e}^{\ensuremath{-}}+^{14}\mathrm{N}^{*}$ (2.31 MeV), conserved vector current, partially conserved axialvector current, and a possible second-class axial current, yields $50 invsec l{[\ensuremath{\Gamma}({\ensuremath{\mu}}^{\ensuremath{-}}+^{14}\mathrm{N}\ensuremath{\rightarrow}{\ensuremath{\nu}}_{\ensuremath{\mu}}+^{14}\mathrm{C} (\mathrm{ground}\mathrm{state}))]}_{\mathrm{stat}.\mathrm{av}.}l70 invsec$ and $95 invsec l{[\ensuremath{\Gamma}({\ensuremath{\mu}}^{\ensuremath{-}}+^{14}\mathrm{N}\ensuremath{\rightarrow}{\ensuremath{\nu}}_{\ensuremath{\mu}}+^{14}\mathrm{C} (\mathrm{ground}\mathrm{state}))]}_{F=\frac{1}{2}}l210 invsec$. The microscopic treatment leads to the conclusion that the nucleons-only-impulse-approximation and meson-exchange contributions to the $^{14}\mathrm{C}(^{14}\mathrm{O})\ensuremath{\rightarrow}^{14}\mathrm{N}+{e}^{\ensuremath{-}}({e}^{+})+{\overline{\ensuremath{\nu}}}_{e}({\ensuremath{\nu}}_{e})$ amplitude may well be opposite in sign and comparable in magnitude so that the destructive interference between them contributes significantly to the anomalously small values of $\ensuremath{\Gamma}(^{14}\mathrm{C}(^{14}\mathrm{O})\ensuremath{\rightarrow}^{14}\mathrm{N}+{e}^{\ensuremath{-}}({e}^{+})+{\overline{\ensuremath{\nu}}}_{e}({\ensuremath{\nu}}_{e}))$ and ${[\ensuremath{\Gamma}({\ensuremath{\mu}}^{\ensuremath{-}}+^{14}\mathrm{N}\ensuremath{\rightarrow}{\ensuremath{\nu}}_{\ensuremath{\mu}}+^{14}\mathrm{C} (\mathrm{ground}\mathrm{state}))]}_{\mathrm{stat}.\mathrm{av}.,F=\frac{1}{2}}$.RADIOACTIVITY $^{14}\mathrm{C}\ensuremath{\rightarrow}^{14}\mathrm{N}+{e}^{\ensuremath{-}}+{\overline{\ensuremath{\nu}}}_{e}$, $^{14}\mathrm{O}\ensuremath{\rightarrow}^{14}\mathrm{N}+{e}^{+}+{\ensuremath{\nu}}_{e}$, ${\ensuremath{\mu}}^{\ensuremath{-}}+^{14}\mathrm{N}\ensuremath{\rightarrow}{\ensuremath{\nu}}_{\ensuremath{\mu}}+^{14}\mathrm{C}$ (ground state), theoretical analysis via "elementary particle" and "microscopic" treatments.

Published
1977

104. Muon capture by the deuteron with outgoing neutrinos of very small momentum

Author

B. Goulard, B. Lorazo, and H. Primakoff

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Nuclear Theory, Muon capture, Baryon, Momentum, Nuclear physics, Massless particle, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Nucleon, Lepton
Abstract

Large mesonic exchange current corrections are obtained in the calculation of the rate of muon capture by the deuteron with outgoing neutrinos of very small momentum. Detailed results are given for m/sub ..nu../ = 0. No difference sufficiently large to be observed with present techniques is predicted for m/sub ..nu../< or =2.5 MeV/c/sup 2/.

Published
1982

105. Remarkable properties of the broken-pair model

Author

Christiane Quesne and B. Lorazo

Subjects
Physics, Nuclear and High Energy Physics, Relation (database), media_common.quotation_subject, Structure (category theory), Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, Rotation formalisms in three dimensions, Theoretical physics, Transformation (function), Condensed Matter::Superconductivity, Quantum mechanics, Scheme (mathematics), Quasiparticle, Condensed Matter::Strongly Correlated Electrons, Simplicity, Algebra over a field, media_common
Abstract

A non-spurious quasiparticle scheme is presented, its number-projection being exactly the broken-pair model. From this property, quantities needed in the broken-pair approach are easily evaluated by making use of the extreme simplicity of the quasiparticle algebra. Applications to the hamiltonian operator and to one-body operators are presented for seniority υ = 0, 1 and 2.

Published
1983

106. Nuclear spectroscopy data sorting with parallel processors

Author

Stephane Flibotte, M. Beaulieu, R. Bornais, P. Taras, F. Banville, B. Lorazo, and J. Gascon

Subjects
Complex data type, Physics, Nuclear and High Energy Physics, Software, business.industry, Detector, Nuclear spectroscopy, Sorting, Fermilab, Data sorting, business, Instrumentation, Computational science
Abstract

Software for off-line sorting of data from high-spin nuclear-spectroscopy experiments has been developed for the Fermilab ACP parallel processors. The performance of the codes has been measured for various data analyses. The sorting of multicoincidence data from germanium detectors into high-resolution matrices, as well as more complex data analyses, can be done at rates of about 10 million events per hour.

Published
1989

108. Nucleon-nucleon scattering in the quark-cluster model

Author

B. Lorazo, M. Harvey, and J. Letourneux

Subjects
Nuclear physics, Quark, Physics, Nuclear and High Energy Physics, Particle physics, Scattering, Nuclear Theory, Cluster (physics), Phase (waves), Scattering length, Nucleon, Rotation formalisms in three dimensions, Interpretation (model theory)
Abstract

Results of calculations of nucleon-nucleon scattering phase shifts (S-, P- and D-wave) and delta-production cross sections are presented for a quark potential model with channel coupling in both generator-coordinate and resonating-group formalisms. The dependence of the results on various input assumptions is shown. The interpretation in terms of a local potential is discussed, as are the extensions to the calculation necessary for agreement with experiment.

Published
1984

109. Remarkable properties of the broken-pair model

Author

B. Lorazo

Subjects
Physics, Nuclear and High Energy Physics, Matrix (mathematics), Pure mathematics, Operator (computer programming), Differential structure, Subspace topology
Abstract

The differential structure of the broken-pair model is exhibited. As a consequence, matrix elements of any operator acting in the k -broken-pair subspace (or between states with different broken-pair numbers) can be evaluated by making use of effective operators defined in the 0-broken-pair subspace only.

Published
1983

110. Design and tests of the z-coordinate drift chamber system for the opal central detector at LEP

Author

D. Hanna, M.J. Losty, C. K. Hargrove, L. Godfrey, H. Jeremie, L. Lessard, R H Payne, J. J. Dumont, A. C. McPherson, M. S. Dixit, J. P. Martin, H. Mes, F.G. Oakham, R. J. Hemingway, G. Bavaria, B. Lorazo, and R. K. Carnegie

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Physics::Instrumentation and Detectors, business.industry, Detector, Resolution (electron density), Radius, Sense (electronics), Magnetic field, Optics, Electric field, business, Instrumentation, Beam (structure)
Abstract

A system of drift chambers has been designed to make high resolution measurements of the z -coordinates of charged tracks at the outer radius of the OPAL central detector at LEP. The unit module of this detector is a 25 cm drift length bidirectional cell with six sense wires in a thin 50 cm wide by 29 mm high drift slot. Tests indicate that the chamber has a wide and stable electric field operating range and its performance is unaffected by small misalignments between the drift electric field and an external magnetic field. The drift cell was found to have uniform acceptance up to its geometrical boundaries, and the z -resolution for beam tracks normal to the chamber was measured to be in the range of 40–175 μm.

Published
1988

111. Variational principle with a n-pair wave function

Author

B. Lorazo

Subjects
Physics, Nuclear and High Energy Physics, Variational method, Variational principle, Quantum mechanics, Luke's variational principle, Hartree–Fock method, Limit (mathematics), Residual, Wave function, Variational integrator, Mathematical physics
Abstract

New variational equations for a n-pair wave function are presented. They are as simple as the gap equations, can be solved without any approximation and are free of the trivial solution even in the limit of weak residual interactions.

Published
1975

112. The broken-pair model versus the quasi-particle scheme: Two different formalisms?

Author

Christiane Quesne and B. Lorazo

Subjects
Physics, Nuclear and High Energy Physics, Formalism (philosophy of mathematics), Physics::Accelerator Physics, Statistical physics, Rotation formalisms in three dimensions
Abstract

The particle-number conserving Broken-Pair Model (BPM) and the Quasi-Particle Scheme (QPS) are shown to be nothing but two aspects of the same formalism. As a consequence, the old problem of the number-projection becomes elementary and BPM is algebraically as simple as QPS. Furthermore, owing to the existence of simple recursion formulas, BPM is also numerically as tractable as QPS.

Published
1982

113. Interplay between mesonic-exchange corrections and nuclear structure in the weak transitionsO16(0+) ⇄N16(0−)

Author

B. Lorazo, B. Goulard, and W. K. Cheng

Subjects
Nuclear physics, Physics, Nuclear reaction, Nuclear and High Energy Physics, Meson, Hadron, Nuclear structure, High Energy Physics::Experiment, Elementary particle, Atomic physics, Ground state, Boson, Lepton
Abstract

The ratio of the muon-capture rate to the beta-decay rate in the weak transition /sup 16/O(0/sup +/; ground state) arrow-right-left /sup 16/N(0/sup -/; 120 keV) is analyzed in terms of the interplay between mesonic-exchange currents and configuration mixing. It is shown that, up to date, various approaches are too preliminary to yield a quantitative conclusion on the role of mesonic-exchange currents contribution.

Published
1980

114. An extension of the generalized seniority coupling scheme

Author

B. Lorazo

Subjects
Physics, Coupling, Nuclear and High Energy Physics, Pairing, Configuration space, State (functional analysis), Atomic physics, Wave function, Linear subspace, Subspace topology, Projection (linear algebra), Mathematical physics
Abstract

The total configuration space of the shell-model for N particles can be broken into several subspaces which differ between themselves by the number of particle being in a pair state. The projection of the exact shell model wave functions onto these subspaces is studied as well as the result of diagonalizing the interaction within each subspace separately. The case of J = 0 + states is studied here for a pairing force and a surface delta interaction in the case of 62 Ni and 116 Sn and also for more realistic interactions in the case of 62 Ni.

Published
1969

115. Generalized seniority and broken-pair coupling scheme

Author

B. Lorazo

Subjects
Physics, Many-body problem, Coupling, Nuclear and High Energy Physics, Pairing, Quantum mechanics, Quasiparticle, Configuration space, Ground state, Wave function, Identical particles
Abstract

The ground state wave function of the 2 n identical particles system being described by a superposition of n identical J π = 0 + coupled pairs I + , the total configuration space of the shell model is divided into subspaces according to the number of pairs I + they contain. This provides a coupling scheme, the broken-pair one, formally identical to the quasiparticle coupling scheme, but conserving the particle number. Numerical study of the broken-pair structure of the eigenstates of some interactions, such as pairing, surface delta and more realistic ones, is performed using projections on and diagonalization within restricted space. An attempt to determine the connection between the broken-pair coupling-scheme and the quasi-spin properties of the residual interactions is made.

Published
1970

116. Efficiency of Billoir's track fitting method for the OPAL central detector

Author

H. Jeremie, B. Lorazo, and D. Savard

Subjects
Physics, Nuclear and High Energy Physics, Optics, business.industry, Scattering, Track (disk drive), Detector, High Energy Physics::Experiment, business, Instrumentation, Computer Science::Databases
Abstract

Track fitting in the OPAL central detector can be improved at low energies with a recursive method due to Billoir [1], which accounts for multiple scattering.

Published
1988

117. Mass limits for a standard model Higgs boson in e+e- collisions at LEP

Author

H. Wang, D. E. Plane, V. H. Winterer, Stephen Hillier, Gunter Quast, Kiyotomo Kawagoe, D. Hochman, D. Duchesneau, C. Wahl, A. P. Wagner, H. M. Fischer, Alan Watson, D. J.P. Dumas, M. J. Losty, Masatoshi Koshiba, R. W. L. Jones, M. T. French, J. M. Roney, G.T.J. Arnison, B. Holl, A. Michelini, G. Knop, T. J. Smith, P. Igo-Kemenes, P. Le Du, H. Kreutzmann, Harold Nguyen, A. Jawahery, G. Maringer, J. Steuerer, H. Jeremie, H. Yamashita, P. A. Elcombe, P. Farthouat, Horst Breuker, E. Jin, G. Giacomelli, P. Mättig, H. Oh, R. E. Hughes-Jones, U. Maur, B. Wuensch, Peter Sherwood, H. Hagedorn, Frans Meijers, S. Zylberajch, P. S. Hinde, P. W. Jeffreys, P. G. Estabrooks, I. J. Bloodworth, R. W. Springer, Gideon Bella, W. R. Gibson, C. Ho, H. J. Burckhart, Jacqueline Batley, H. Mes, John Allison, A. Possoz, H. Takeda, E. Heflin, Phillip Allport, R. M. Brown, Lorne Levinson, C. Y. Chang, P. Bock, M. M.B. Lasota, C. Fukunaga, O. W. Davies, N. K. Watson, H. El Mamouni, Tohru Takeshita, Shlomo Dado, D. L. Rees, B. W. Kennedy, M. J. Oreglia, D. Granite, D. Karlen, M. W. Moss, C. Milstene, O. Ganel, P. M. Watkins, P. G. Murphy, C. M. Hawkes, Daniel Lellouch, Mitsuaki Nozaki, A. C. McPherson, Takehiko Mori, R. G. Kellogg, P. M. Hattersley, R. Ströhmer, M. Jimack, Erez Etzion, G. M. Dallavalle, B. J. Saunders, K. Riles, I. P. Duerdoth, Georges Azuelos, D. Strom, Gareth J. Barker, F. Lamarche, G. T. Zorn, Giora Mikenberg, G. J. VanDalen, J. Schwarz, A. Shapira, F. Odorici, J. R. Carter, G. N. Patrick, A. Simon, Stefano Marcellini, Otmar Biebel, Wolfram Dietrich Zeuner, K. Runge, R. J. Hemingway, F. Beck, N. I. Geddes, K. W. Bell, Colin Roach, J. D. Hobbs, I. Wingerter, D. G. Charlton, D. C. Imrie, F. Roehner, M. Couch, G. P. Siroli, P. Jovanovic, Misao Sasaki, G. A. Snow, C. P. Ward, J. Ma, F. K. Loebinger, J. L. Pinfold, E. J. Spreadbury, B. C. Shen, Norbert Wermes, J. T.M. Chrin, M. W. Redmond, Austin Ball, D. Menszner, T. Kawamoto, P. Grosse-Wiesmann, O. Runolfsson, K. Stephens, B. Poli, A. Rollnik, L. Lessard, R. Yaari, John Baines, O. Schaile, M. Regimbald, R. P. Middleton, H. E. Stier, D. R. Ward, M. Z. Akrawy, Alessandro Montanari, E. K. U. Gross, S. Orito, S. Bethke, Marco Cuffiani, M. Sproston, R. Kowalewski, J. Goldberg, T. R. Wyatt, P. Routenburg, A. Dieckmann, S. R. Hou, B. Nellen, Gideon Alexander, M. S. Dixit, S. Wotton, J. D. Gillies, P. Leblanc, Despina Hatzifotiadou, P. Kyberd, Paolo Capiluppi, G. D. Lafferty, N. C. Wood, K. J. Anderson, A. D. Schaile, J. M. Lorah, T. W. Pritchard, R. J. Barlow, Makoto Minowa, D. J. Miller, D. E. Klem, A. M. Rossi, J. Ludwig, T. Tsukamoto, M. J. Goodrick, Joachim Heintze, I. Cohen, M. F. Turner, C. K. Hargrove, W. J. Murray, Ehud Duchovni, B. P. O'Neill, R. A. Sansum, J. Hagemann, S. W. Gensler, T. Kobayashi, J. Hart, W. Mohr, Y. Yang, C. J. Virtue, M. Hansroul, M. Coupland, Stephen Lloyd, R. J. Homer, Christoph Geich-Gimbel, B. Gandois, M. M. Deninno, J. Kroll, F. X. Gentit, G. Bavaria, J. E. Conboy, M. Ogg, F. G. Oakham, A. Pouladdej, J. Banks, S. Schreiber, F. S. Merritt, T. J. McMahon, J. C. Armitage, A. J.P. O'Dowd, R. K. Carnegie, S. Weisz, D. G. Fong, R. D. Heuer, J. G. Layter, M. S. Weber, J. A. Wilson, Fabrizio Fabbri, S. Sanghera, J. P. Martin, D. Van den plas, John Hill, G. Tysarczyk, A. Buijs, H. von der Schmitt, W. Schappert, J. von Krogh, P. Lennert, J. Raab, Marcello Mannelli, C. N. P. Gee, P. Ashton, M. Jobes, T. P. Kokott, Rene Brun, P. Scharff-Hansen, C. P. Howarth, W. J. Larson, Michael Dittmar, G. Yekutieli, J. E. Pilcher, J. W. Gary, J. Grunhaus, A. A. Carter, A. A. Macbeth, G. W. Wilson, A. M. Smith, M. Hauschild, B. Lorazo, M. Weymann, Andris Skuja, Tetsuro Mashimo, S. J. Pawley, M. Imori, Claus Kleinwort, L. Köpke, S. W. O'Neale, Achim Müller, Peter R Hobson, J. Waterhouse, and W. Gorn

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Higgs boson, High Energy Physics::Experiment, Particle Physics - Experiment, Standard Model
Abstract

A search for the minimal standard model Higgs boson has been performed with data from e+e− collisions in the OPAL detector at LEP. The analysis is based on 825 nb−1 of data taken at centre-of-mass energies between 88.3 and 95.0 GeV. The search concentrated on the reactions e + e − →(e + e − or μ + μ − or v v )H 0 ,H 0 →( q q or τ + τ − ) , for Higgs masses above 3 GeV/c2. No Higgs boson candidates have been observed. The present study excludes the existence of a standard model H0 with mass in the range 3.0⩽mH⩽19.3 GeV/c2 at the 95% confidence level.

Published
1989

118. A search for acoplanar pairs of leptons or jets in Z0 decays: mass limits on supersymmetric particles

Author

Gunter Quast, J. P. Martin, A. Buijs, D. G. Fong, O. Schaile, H. von der Schmitt, Gideon Bella, H. J. Burckhart, M. T. French, Jacqueline Batley, Michael Dittmar, G. Yekutieli, J. Steuerer, G. Tysarczyk, F. Roehner, Marcello Mannelli, C. N. P. Gee, G.T.J. Arnison, D. Hochman, Kiyotomo Kawagoe, P. Igo-Kemenes, K. J. Anderson, H. E. Stier, P. G. Estabrooks, A. A. Carter, N. K. Watson, P. M. Watkins, G. Maringer, B. C. Shen, O. Ganel, J. Hart, A. P. Wagner, Christoph Geich-Gimbel, S. Wotton, K. Stephens, Y. Yang, H. Jeremie, A. Simon, Andris Skuja, C. M. Roach, J. G. Layter, I. Wingerter, R. E. Hughes-Jones, U. Maur, J. M. Roney, K. Riles, Otmar Biebel, D. G. Charlton, C. J. Virtue, M. M. Deninno, Tetsuro Mashimo, C. M. Hawkes, M. M.B. Lasota, C. Y. Chang, Stephen Lloyd, O. W. Davies, M. Couch, Ana Beatriz Alvarez Perez, S. Sanghera, Terry Richard Wyatt, S. J. Pawley, J. Kroll, G. Knop, M. Coupland, R. Kowalewski, Claus Kleinwort, L. Köpke, Mitsuaki Nozaki, C. Milstene, H. Hagedorn, W. Gorn, J. D. Hobbs, C. Wahl, John Baines, M. Regimbald, B. Holl, Daniel Lellouch, Phillip Allport, G. Bavaria, C. P. Howarth, J. E. Conboy, M. Ogg, A. C. McPherson, A. Jawahery, J. T.M. Chrin, G. Giacomelli, J. E. Pilcher, M. Jobes, J. C. Armitage, F. Lamarche, F. X. Gentit, P. Scharff-Hansen, D. R. Ward, P. Lennert, R. J. Hemingway, F. G. Oakham, Shlomo Dado, F. Odorici, A. A. Macbeth, M. Imori, A. Pouladdej, W. J. Larson, D. E. Klem, D. E. Plane, G. W. Wilson, M. Hauschild, Takehiko Mori, J. W. Gary, J. von Krogh, J. Raab, Horst Breuker, P. Farthouat, Peter Sherwood, T. Kawamoto, R. W. Springer, S. W. O'Neale, D. C. Imrie, Stephen Hillier, R. W. L. Jones, F. S. Merritt, S. Orito, John H. Schwarz, Frans Meijers, E. J. Spreadbury, H. Oh, M. F. Turner, J. Ludwig, A. M. Smith, B. Lorazo, P. Ashton, P. Le Du, Achim Müller, Peter R Hobson, J. Waterhouse, G. P. Siroli, G. M. Dallavalle, A. D. Schaile, A. J.P. O'Dowd, Gideon Alexander, P. Kyberd, N. Lupu, Paolo Capiluppi, John Allison, P. Jovanovic, Austin Ball, D. Menszner, H. Kreutzmann, P. S. Hinde, K. Runge, P. Bock, J. Grunhaus, C. K. Hargrove, Ehud Duchovni, D. J.P. Dumas, E. Jin, Erez Etzion, H. El Mamouni, M. J. Oreglia, M. Z. Akrawy, Alessandro Montanari, Tohru Takeshita, W. J. Murray, P. G. Murphy, B. J. Saunders, Giora Mikenberg, R. A. Sansum, P. Grosse-Wiesmann, S. W. Gensler, J. D. Gillies, I. P. Duerdoth, J. R. Carter, Georges Azuelos, S. Schreiber, T. J. McMahon, Gareth J. Barker, T. Kobayashi, A. T. Watson, V. H. Winterer, J. Banks, G. N. Patrick, K. W. Bell, M. W. Moss, M. Weymann, P. M. Hattersley, N. C. Wood, R. K. Carnegie, Max Weber, S. Weisz, T. P. Kokott, Rene Brun, R. D. Heuer, J. C. Hill, Misao Sasaki, R. Ströhmer, O. Runolfsson, R. J. Barlow, D. J. Miller, S. R. Hou, J. A. Wilson, Fabrizio Fabbri, D. Van den plas, G. A. Snow, R. G. Kellogg, D. Strom, G. T. Zorn, C. P. Ward, Norbert Wermes, D. Duchesneau, W. Schappert, L. Lessard, M. Hansroul, M. S. Dixit, Despina Hatzifotiadou, B. Gandois, Wolfram Dietrich Zeuner, F. Beck, G. D. Lafferty, W. R. Gibson, Stefano Marcellini, H. Yamashita, C. Ho, R. J. Homer, T. J. Smith, T. W. Pritchard, E. Heflin, P. Mättig, A. Possoz, B. Wuensch, R. M. Brown, Lorne Levinson, I. J. Bloodworth, H. Takeda, B. W. Kennedy, P. W. Jeffreys, J. Ma, F. K. Loebinger, H. Mes, R. P. Middleton, C. Fukunaga, M. W. Redmond, D. Karlen, M. Jimack, A. Rollnik, J. L. Pinfold, Masatoshi Koshiba, Harold Nguyen, A. M. Rossi, T. Tsukamoto, B. P. O'Neill, N. I. Geddes, B. Poli, H. M. Fischer, M. J. Losty, A. Michelini, J. Hagemann, P. A. Elcombe, D. L. Rees, G. J. VanDalen, J. Goldberg, B. Nellen, P. Leblanc, J. M. Lorah, Makoto Minowa, W. Mohr, M. J. Goodrick, Joachim Heintze, I. Cohen, E. K. U. Gross, M. Sproston, P. Routenburg, A. Dieckmann, S. Zylberajch, R. Yaari, S. Bethke, Marco Cuffiani, A. Shapira, D. Granite, and H. Wang

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Chargino, Electron–positron annihilation, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Particle Physics - Experiment, Lepton
Abstract

We have searched for Z 0 decays into acoplanar pairs of leptons or jets. The data were recorded with the OPAL detector during an energy scan around the Z 0 peak and correspond to about 17000 produced Z 0, s. We have determined model independent limits on branching ratios for the Z 0 to decay into pairs of heavy particles with subsequent decays leading to the above topologies. In the context of supersymmetric models, mass bounds close to the kinematic limit were obtained for the scalar leptons, ẽ, gm, gt, and for the chargino, X ± .

Published
1989

119. An application of the GEANT3 geometry package to the description of the OPAL detector

Author

G. Patrick, J. J. Dumont, C. P. Ward, S. W. O'Neale, A. C. McPherson, Antonio Rossi, Peter R Hobson, B. Lorazo, R. J. Hemingway, D. R. Ward, Rene Brun, D. Hochman, C. Y. Chang, F. Bruyant, A. Possoz, P. M. Hattersley, P. Zanarini, J. Mallet, John Allison, F. W. Bullock, and Tatsuo Kawamoto

Subjects
Physics, Particle physics, Wire chamber, Large Hadron Collider, Physics::Instrumentation and Detectors, Detector, Monte Carlo method, General Physics and Astronomy, Particle detector, Computational science, Hardware and Architecture, Electrical equipment, Large Electron–Positron Collider, Measuring instrument, High Energy Physics::Experiment, Detectors and Experimental Techniques
Abstract

We present the general features of the GEANT3 package for coding the geometrical structure of a large and complex detector in the computer programs used for their design and analysis. This package has been developed in the context of Monte Carlo studies of detector performance but should be well matched to the problem of analysis. As a specific example, we illustrate the description of the OPAL detector for the Large Electron Positron collider at CERN and show the results of a sample study using this description.

Published
1987

120. A search for the top and b' quarks in hadronic Z0 decays

Author

J. D. Hobbs, G. Giacomelli, Frans Meijers, J. G. Layter, Ana Beatriz Alvarez Perez, S. Sanghera, M. T. French, C. Beard, A. J.P. O'Dowd, A. T. Watson, J. Hart, J. P. Martin, G. Tysarczyk, A. Shapira, P. Igo-Kemenes, G. Maringer, H. Jeremie, B. Holl, F. Lamarche, R. J. Hemingway, Christoph Geich-Gimbel, Kiyotomo Kawagoe, I. J. Bloodworth, C. Fukunaga, H. Oh, R. E. Hughes-Jones, U. Maur, H. M. Fischer, Gideon Bella, J. Banks, G.T.J. Arnison, M. M. Deninno, M. J. Losty, A. P. Wagner, D. E. Klem, Jacqueline Batley, J. Ma, T. P. Kokott, Rene Brun, P. Jovanovic, S. Weisz, Austin Ball, E. K. U. Gross, R. D. Heuer, Fabrizio Fabbri, D. G. Fong, D. Menszner, J. Kroll, M. Jimack, M. M.B. Lasota, B. J. Saunders, H. E. Stier, D. Van den plas, J. M. Roney, M. Sproston, F. X. Gentit, H. von der Schmitt, Gareth J. Barker, A. Michelini, M. Z. Akrawy, Alessandro Montanari, O. W. Davies, A. Jawahery, G. Bavaria, J. E. Conboy, M. Ogg, F. K. Loebinger, P. Routenburg, G. Knop, H. El Mamouni, M. J. Oreglia, C. Milstene, H. Hagedorn, A. C. McPherson, A. Dieckmann, Y. Yang, J. D. Gillies, A. Pouladdej, Tohru Takeshita, N. C. Wood, P. A. Elcombe, J. L. Pinfold, F. Odorici, P. G. Estabrooks, P. Lennert, C. M. Roach, M. F. Turner, R. J. Barlow, M. W. Redmond, F. S. Merritt, D. J. Miller, J. R. Carter, G. N. Patrick, M. S. Dixit, Peter Sherwood, J. Grunhaus, A. Simon, D. Hochman, Otmar Biebel, Despina Hatzifotiadou, D. G. Charlton, F. Roehner, D. L. Rees, G. D. Lafferty, A. Rollnik, I. P. Duerdoth, Marcello Mannelli, K. Stephens, M. Couch, R. W. Springer, C. N. P. Gee, H. Yamashita, G. A. Snow, C. P. Ward, N. K. Watson, Georges Azuelos, M. Jobes, D. Karlen, G. J. VanDalen, W. J. Murray, R. W. L. Jones, J. Ludwig, A. Possoz, J. C. Armitage, C. M. Hawkes, T. W. Pritchard, Stephen Lloyd, H. Takeda, P. Farthouat, Daniel Lellouch, P. M. Watkins, P. Le Du, K. Runge, P. Bock, H. Kreutzmann, P. Scharff-Hansen, Horst Breuker, W. J. Larson, D. Granite, J. T.M. Chrin, Takehiko Mori, K. W. Bell, Masatoshi Koshiba, S. J. Pawley, E. Jin, R. P. Middleton, John Baines, S. Zylberajch, Claus Kleinwort, L. Köpke, Max Weber, J. W. Gary, M. Imori, P. S. Hinde, E. J. Spreadbury, M. Regimbald, Harold Nguyen, T. Kawamoto, J. C. Hill, A. D. Schaile, S. W. O'Neale, W. R. Gibson, C. Y. Chang, M. Hansroul, Peter R Hobson, A. M. Smith, N. I. Geddes, J. Waterhouse, Misao Sasaki, P. Grosse-Wiesmann, C. Ho, B. C. Shen, R. Ströhmer, I. Wingerter, M. W. Moss, D. R. Ward, J. M. Lorah, N. Wermes, M. Weymann, D. Duchesneau, V. H. Winterer, P. W. Jeffreys, B. Lorazo, Mitsuaki Nozaki, P. M. Hattersley, D. Strom, S. Orito, John H. Schwarz, H. Wang, Makoto Minowa, H. Mes, B. P. O'Neill, W. Mohr, Andris Skuja, G. T. Zorn, Shlomo Dado, S. R. Hou, C. K. Hargrove, Ehud Duchovni, R. J. Homer, E. Heflin, T. J. Smith, Gunter Quast, R. M. Brown, Wolfram Dietrich Zeuner, J. Hagemann, Tetsuro Mashimo, John Allison, D. C. Imrie, P. Mättig, R. Kowalewski, Lorne Levinson, F. Beck, G. M. Dallavalle, P. G. Murphy, R. Yaari, B. Wuensch, B. Poli, S. Bethke, W. Gorn, B. W. Kennedy, Marco Cuffiani, Giora Mikenberg, R. A. Sansum, G. P. Siroli, R. G. Kellogg, J. Goldberg, Stefano Marcellini, D. E. Plane, B. Nellen, O. Ganel, Stephen Hillier, H. Boerner, P. Leblanc, K. Riles, D. J.P. Dumas, A. M. Rossi, T. Tsukamoto, S. W. Gensler, B. Gandois, M. J. Goodrick, Joachim Heintze, I. Cohen, T. Kobayashi, F. G. Oakham, H. J. Burchart, Phillip Allport, O. Schaile, O. Runolfsson, Gideon Alexander, P. Kyberd, N. Lupu, Paolo Capiluppi, A. Buijs, A. A. Macbeth, G. W. Wilson, M. Hauschild, C. J. Virtue, Terry Richard Wyatt, M. Coupland, Achim Müller, C. Wahl, C. P. Howarth, J. E. Pilcher, Michael Dittmar, G. Yekutieli, A. A. Carter, L. Lessard, S. Schreiber, T. J. McMahon, R. K. Carnegie, S. Wotton, J. A. Wilson, W. Schappert, J. von Krogh, J. Raab, P. Ashton, and K. J. Anderson

Subjects
Physics, Nuclear and High Energy Physics, Top quark, Particle physics, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, Down quark, Top quark condensate, Omega baryon, Bottom quark, Sigma baryon, Nuclear physics, Quark star, Up quark, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

We report on a search for new quarks in hadronic Z° decays. From the event shape analysis of a data sample containing 2185 multihadronic annihilation events, we observe no evidence for the top or b' quarks. We derive limits for the top and b' quark masses under the assumption of various possible standard model and non-standard model decay schemes. Our search is sensitive to quark masses larger than 23 GeV/c2; it yields the following lower limits at a 95% confidence level: 44.5 GeV/c2 for the top quark mass and 45.2 GeV/c2 for the b′ quark mass.

Published
1989

121. MEASUREMENT OF THE LEPTONIC BRANCHING RATIOS OF THE TAU-LEPTON

Author

P. G. Estabrooks, O. C. Cooke, R. K. Keeler, P. M. Watkins, G. G. Hanson, D. R. Rust, P. S. Wells, Terry Richard Wyatt, P. Schenk, N. Capdevielle, M. S. Dixit, R. W. Springer, Frans Meijers, J. von Krogh, A. M. Lee, S. L. Chu, Shlomo Dado, Tohru Takeshita, M. J. Oreglia, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, H. Mes, Stephen Lloyd, Dave Robinson, J. C. Clayton, J. P. Martin, M. Tscheulin, I. P. Duerdoth, P. Fath, M. Tecchio, Robert M Brown, Georges Azuelos, Silvia Arcelli, S. De Jong, Barry King, L. A. del Pozo, K. W. Bell, H. Przysiezniak, R. Van Kooten, J. R. Carter, G. N. Patrick, J. C. Hill, Misao Sasaki, J. G. Layter, P. Gagnon, C. Charlesworth, Otmar Biebel, B. C. Shen, T. J. Smith, K. Stephens, T. G. Shears, Gregor Herten, B. Wilkens, T. J. McMahon, Gideon Bella, D. L. Wagner, Giora Mikenberg, P. Igo-Kemenes, W. P. Lai, James Pinfold, M. Yurko, D. M. Gingrich, D. G. Fong, Siegfried Bethke, A. K. Honma, B. Nijjhar, V. Gibson, W. G. Scott, C. Dallapiccola, P. Poffenberger, J. Schwiening, R. K. Carnegie, J. P. Pansart, Gunter Wolf, F. X. Gentit, H. J. Burckhart, H. Deng, Jacqueline Batley, H. Jeremie, P. Berlich, J. Gascon, G. T. Zorn, J. A. Wilson, G. A. Beck, Ehud Duchovni, Achim Stahl, P. Teixeira-Dias, J. E. Pilcher, F. S. Merritt, J. M. Roney, Peter Fischer, R. E. Hughes-Jones, U. Maur, D. E. Plane, P. W. Jeffreys, H. M. Bosch, J. Letts, P. Schütz, M. Jimack, S. Braibant, J. D. Gillies, D. R. Ward, T. Kress, M. Fanti, M. J. Losty, E. Lefebvre, Wolfram Dietrich Zeuner, C. Sbarra, G. M. Dallavalle, R. Lahmann, J. W. Gary, D. C. Imrie, F. Palmonari, Norbert Wermes, Sherry Towers, A. Gaidot, J. Steuerer, N. J. Oldershaw, Eilam Gross, B. Schmitt, Michael Dittmar, F. Odorici, G. Yekutieli, S. W. Gensler, S. J. Hillier, T. Kawamoto, E. do Couto e Silva, R.J. Akers, D. S. Koetke, Marcello Mannelli, J. E. Duboscq, T. Kobayashi, A. A. Carter, Ron Folman, G. P. Siroli, J. King, Roger Jones, J. A. McKenna, P. Bright-Thomas, R. Howard, Christoph Schwick, A. Yeaman, H. M. Fischer, G. A. Snow, C. P. Ward, Claude Leroy, R. D. Heuer, D. Hochman, Andris Skuja, O. Schaile, C. Y. Chang, P. Utzat, S. Orito, M. Rosvick, Fabrizio Fabbri, D. L. Rees, S. Söldner-Rembold, John Allison, G. D. Long, M. G. Rison, P. Taras, Xinchou Lou, Marco Cuffiani, Tetsuro Mashimo, R. Bartoldus, Michael Kobel, J. J. Ward, Kiyotomo Kawagoe, P. Vikas, S. Wotton, M. Starks, H. O. Ogren, A. J. Martin, R. J. Barlow, Christoph Geich-Gimbel, Margret Fincke-Keeler, Reda Tafirout, W. Gorn, Julie Kirk, H. Lafoux, R. Kowalewski, D. J. Miller, G. W. Wilson, P. Weber, T. Behnke, T. Hilse, A. Michelini, A. Buijs, D. M. Strom, M. Hauschild, C. Stegmann, O. Runolfsson, K. Ametewee, O. Tousignant, P. Scharff-Hansen, J. E. Conboy, A. Fürtjes, Sachio Komamiya, H. Fukui, C. Markus, Theodoros Geralis, Gideon Alexander, Dave Charlton, E. Ros, A. T. Watson, W. R. Gibson, Paolo Capiluppi, C. Beeston, S. W. O'Neale, A. Beck, K. J. Anderson, E. Heflin, Claudio Grandi, A. M. Smith, Lorne Levinson, D. Axen, A. Jawahery, G. Vasseur, R. Bürgin, B. Fabbro, P. D. Phillips, R. G. Kellogg, B. Lorazo, Gilles Beaudoin, A. Skillman, Peter Sherwood, G. Giacomelli, Alexander Wagner, J. Hagemann, S. G. Clowes, J. Ludwig, M. Fierro, J. E.G. Edwards, A. I. McNab, J. Goldberg, K. Runge, P. Bock, R. Mir, T. P. Kokott, A. Luig, B. Nellen, P. Leblanc, J. Lauber, Paolo Giacomelli, M. Hansroul, H. G. Evans, M. J. Goodrick, H. Takeda, C. H. Shepherd-Themistocleous, I. Cohen, F. G. Oakham, Stefano Marcellini, S. A. Robins, R. J. Homer, Erez Etzion, Stefan Kluth, Shlomit Tarem, E. L. Barberio, C. J. Oram, M. F. Turner-Watson, M. Morii, Peter R Hobson, R. P. Middleton, P. Routenburg, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, M. W. Redmond, A. M. Rossi, C. Darling, B. Stockhausen, Paul Kyberd, F. K. Loebinger, N. I. Geddes, N. L. Rodning, B. Poli, P. Szymanski, P. Mättig, R. Giacomelli, C. Jui, Shoji Asai, Stan Bentvelsen, Matthias Schröder, C. M. Hawkes, Daniel Lellouch, Takehiko Mori, A. S. Turcot, V. Zacek, V. H. Winterer, I. J. Bloodworth, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, P. A. Hart, M. Settles, T. W. Pritchard, Yoram Rozen, M. J. Pearce, M. Foucher, Guenter Duckeck, Junichi Kanzaki, D. Karlen, C. Burgard, U. Müller, C. K. Hargrove, N. K. Watson, W. Mohr, A. Posthaus, W. Matthews, M. A. Thomson, T. Wlodek, M. Sproston, T. Tsukamoto, N. Tesch, P. A. Elcombe, F. Scharf, A. D. Schaile, and Madjid Boutemeur

Subjects
Nuclear physics, Physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Engineering (miscellaneous), Particle Physics - Experiment, Lepton
Abstract

The leptonic branching ratios of the tau lepton have been determined from data collected by the OPAL detector in 1991 and 1992. From a sample of 27196 e+e−→τ+τ− candidates we find 7322\(\tau \to e\nu \bar \nu\) and 7941\(\tau \to \mu \nu \bar \nu\) candidates. Using efficiency and background estimates determined from a study of Monte Carlo events and control samples of data, the branching ratios\(B(\tau \to e\nu \bar \nu )\)=(18.14±0.20±0.28)% and\(B(\tau \to \mu \nu \bar \nu )\)=(17.48±0.18±0.23)% have been obtained. These new results have been combined with the published results for the 1990 OPAL data to yield the following branching ratios for data taken between 1990 and 1992: $$\begin{gathered} B(\tau \to e\nu \bar \nu ) = (18.04 \pm 0.33)\% , \hfill \\ B(\tau \to \mu \nu \bar \nu ) = (17.36 \pm 0.27)\% . \hfill \\ \end{gathered} $$ These leptonic branching ratios are used with other properties of the muon and tau-lepton to test the universality of charged current leptonic couplings in these decays. The ratio\(R_\tau = B(\tau \to hadrons + \nu _\tau )/B(\tau \to e\bar \nu _e \nu _\tau )\) is calculated using our measured values of the leptonic branching fractions of the tau and tau lifetime from which a value of αs(Q2=Mτ2) is extracted. The value of αs(Q2=MZ2) is obtained byQ2 evolution and agrees with the value from the Z0 line shape analysis.

122. QCD STUDIES USING A CONE-BASED JET FINDING ALGORITHM FOR E+E- COLLISIONS AT LEP

Author

Madjid Boutemeur, C. Darling, T. J. Smith, P. G. Estabrooks, R. K. Keeler, P. Igo-Kemenes, M. Hauschild, P. Mättig, T. R. Wyatt, H. Jeremie, Shoji Asai, P. M. Watkins, R. E. Hughes-Jones, U. Maur, R. J. Barlow, H. Przysiezniak, R. Mir, S. L. Chu, M. Fierro, C. Markus, P. Paschievici, F. C. Grant, E. do Couto e Silva, D. R. Rust, A. M. Lee, C. Y. Chang, H. M. Fischer, C. Moisan, M. Yurko, P. W. Jeffreys, M. F. Turner, G. A. Beck, I. J. Bloodworth, J. E. Conboy, Achim Stahl, J. Mildenberger, P. Teixeira-Dias, Harold Nguyen, M. J. Oreglia, P. Bright-Thomas, A. Buijs, D. M. Strom, Gordon H. Hanson, C. Stegmann, M. Settles, M. Foucher, J. G. Layter, Michael Kobel, H. Fukui, A. Michelini, Silvia Arcelli, R. Bartoldus, B. Schmitt, J. J. Ward, C. Charlesworth, C. Jui, J. R. Carter, G. N. Patrick, P. F. narrison, J. Steuerer, H. Lafoux, J. Goldberg, Margret Fincke-Keeler, M. W. Redmond, Otmar Biebel, G. E. Richards, D. G. Charlton, D. L. Wagner, J. C. Clayton, B. Nellen, G. W. Wilson, D. Karlen, C. Burgard, S. A. Robins, H. Mes, P. Leblanc, Gregor Herten, C. Wahl, B. Wilkens, T. J. McMahon, P. A. Hart, D. A. Hinshaw, Georges Azuelos, H. O. Ogren, Christoph Geich-Gimbel, M. A. Thomson, H. Deng, R. Humbert, J. Schwiening, P. Pfister, P. Poffenberger, J. Hart, C. Dallapiccola, J. M. Roney, R. K. Carnegie, P. Le Du, B. Fabbro, K. W. Bell, M. J. Pearce, R. Yaari, Marco Cuffiani, J. C. Hill, Norbert Wermes, Sherry Towers, B. C. Shen, G. Giacomelli, J. E. Pilcher, A. D. Schaile, J. A. Wilson, Matthias Schröder, C. M. Hawkes, M. Cooper, Daniel Lellouch, Takehiko Mori, Siegfried Bethke, A. K. Honma, G. A. Snow, C. P. Ward, D. L. Rees, R.J. Akers, I. P. Duerdoth, P. Schenk, H. G. Evans, M. J. Goodrick, I. Cohen, P. Schütz, T. Behnke, Gideon Bella, T. Kawamoto, S. Orito, M. Rosvick, W. G. Scott, J. D. Gillies, R. Howard, D. J. Miller, O. Schaile, M. S. Dixit, Frans Meijers, Paul Kyberd, F. K. Loebinger, V. H. Winterer, J. Kroll, G. Beaudoin, H. J. Burckhart, Jacqueline Batley, A. Yeaman, K. Stephens, J. R. McNutt, Paolo Giacomelli, P. E.L. Clarke, M. Hansroul, T. Hilse, R. J. Hemingway, O. Runolfsson, F. X. Gentit, P. M. Hattersley, M. K. Jones, J. P. Martin, Gunter Wolf, D. Axen, V. Gibson, M. J. Losty, A. Jawahery, A. Astbury, A. M. Rossi, G. Quast, A. Fürtjes, P. Jovanovic, U. Müller, M. Sasaki, S. De Jong, Shlomo Dado, Austin Ball, A. J. Martin, T. Tsukamoto, A. Rollnik, R. Giacomelli, Xinchou Lou, Peter Sherwood, C. H. Shepherd-Themistocleous, Claude Leroy, J. P. Pansart, N. J. Tresilian, R. J. Homer, James Pinfold, Kiyotomo Kawagoe, Claudio Grandi, R. W. Springer, Alexander Wagner, N. I. Geddes, J. von Krogh, J. Hagemann, Manuella Vincter, J. Ludwig, Alessandro Montanari, D. R. Ward, S. W. O'Neale, E. Lefebvre, K. Runge, P. Bock, K. J. Anderson, S. Wotton, C. K. Hargrove, B. Boden, Giora Mikenberg, F. S. Merritt, D. G. Fong, B. Poli, F. Odorici, Z. Li, Hans-Christian Schultz-Coulon, P. Weber, J. Allison, Dave Robinson, J. Lauber, Randall Sobie, Michael Schulz, R. Ströhmer, P. S. Wells, J. Gascon, L. A. del Pozo, H. Takeda, S. Barnett, G. T. Zorn, M. Morii, F. G. Oakham, H. von der Schmitt, D. Hochman, H. M. Bosch, Wolfram Dietrich Zeuner, Peter R Hobson, C. Sbarra, M. Coupland, J. A. McKenna, R. Lahmann, D. C. Imrie, P. Routenburg, R. G. Kellogg, Michael Dittmar, Sachio Komamiya, D. S. Koetke, Ehud Duchovni, T. W. Pritchard, Theodoros Geralis, E. Ros, A. T. Watson, G. Yekutieli, Stefano Marcellini, G. P. Siroli, J. King, Erez Etzion, James Letts, Christoph Schwick, T. P. Kokott, A. Luig, Stefan Kluth, A. A. Carter, Ron Folman, Roger Jones, Shlomit Tarem, J. W. Gary, Guenter Duckeck, Marcello Mannelli, J. E. Duboscq, S. Rossberg, C. J. Oram, Andris Skuja, M. G. Rison, M. Jimack, R. P. Middleton, G. D. Long, Tetsuro Mashimo, H. Ihssen, W. Gorn, S. W. Gensler, P. Scharff-Hansen, S. J. Hillier, A. M. Smith, T. Kobayashi, G. Vasseur, B. Lorazo, G. D. Lafferty, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, R. Van Kooten, D. Pitman, M. H. Lehto, C.J. Beeston, T. G. Shears, D. M. Gingrich, P. Berlich, Stephen Lloyd, M. Tecchio, R. Kowalewski, Gideon Alexander, Paolo Capiluppi, D. E. Plane, P. Bentkowski, G. M. Dallavalle, D. J.P. Dumas, W. R. Gibson, A. Beck, E. Heflin, R. M. Brown, Lorne Levinson, B. W. Kennedy, E. Torrente-Lujan, A. Skillman, A. Gaidot, T. Wlodek, M. Sproston, N. Tesch, P. A. Elcombe, J. Becker, F. Scharf, G. J. VanDalen, N. K. Watson, and W. Mohr

Subjects
Cone algorithm, Quantum chromodynamics, Physics, Quark, Jet (fluid), Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Nuclear physics, High Energy Physics::Experiment, Engineering (miscellaneous), Algorithm, Particle Physics - Experiment, Energy (signal processing), Bar (unit)
Abstract

We describe a cone-based jet finding algorithm (similar to that used in $$\bar p$$ p experiments), which we have applied to hadronic events recorded using the OPAL detector at LEP. Comparisons are made between jets defined with the cone algorithm and jets found by the “JADE” and “Durham” jet finders usually used ine + e − experiments. Measured jet rates, as a function of the cone size and as a function of the minimum jet energy, have been compared with O(α 2 ) calculations, from which two complementary measurements $$\alpha _s \left( {M_{Z^0 } } \right)$$ have been made. The results are $$\alpha _s \left( {M_{Z^0 } } \right)$$ =0.116±0.008 and $$\alpha _s \left( {M_{Z^0 } } \right)$$ =0.119±0.008 respectively, where the errors include both experimental and theoretical uncertainties. Measurements are presented of the energy flow inside jets defined using the cone algorithm, and compared with equivalent data from $$\bar p$$ p interactions, reported by the CDF collaboration. We find that the jets ine + e − are significantly narrower than those observed in $$\bar p$$ p. The main contribution to this effect appears to arise from differences between quark- and gluon-induced jets.

123. THE PRODUCTION OF NEUTRAL KAONS IN Z(0) DECAYS AND THEIR BOSE-EINSTEIN CORRELATIONS

Author

C. Y. Chang, P. Taras, Michael Kobel, Julie Kirk, H. Lafoux, G. W. Wilson, M. Hauschild, C. M. Hawkes, Daniel Lellouch, C. Markus, J. Steuerer, W. Matthews, Takehiko Mori, R. Mir, H. Mes, I. P. Duerdoth, R. Bartoldus, N. J. Oldershaw, M. A. Thomson, J. Lauber, P. Fath, T. J. McMahon, V. Zacek, J. Schwiening, R.J. Akers, R. K. Carnegie, N. I. Geddes, H. Takeda, J. A. Wilson, Silvia Arcelli, Andris Skuja, Marco Cuffiani, F. G. Oakham, Richard Keeler, M. J. Oreglia, O. Schaile, E. L. Barberio, E. K. U. Gross, T. Behnke, A. Gaidot, N. L. Rodning, G. D. Long, H. O. Ogren, Christoph Geich-Gimbel, Tetsuro Mashimo, S. L. Chu, T. Wlodek, M. Sproston, B. Poli, B. C. Shen, D. R. Rust, M. Starks, E. Lefebvre, W. P. Lai, R. Howard, Gunter Wolf, Claude Leroy, A. J. Martin, P. Igo-Kemenes, G. N. Patrick, F. Odorici, J. P. Pansart, C. Dallapiccola, T. Tsukamoto, N. Tesch, Siegfried Bethke, J. M. Roney, A. M. Lee, H. Jeremie, H. M. Fischer, A. K. Honma, J. D. Gillies, G. D. Lafferty, W. G. Scott, Otmar Biebel, D. Axen, N. K. Watson, D. L. Wagner, Madjid Boutemeur, A. Jawahery, S. Braibant, R. E. Hughes-Jones, U. Maur, S. Wotton, W. Gorn, Hans-Christian Schultz-Coulon, M. F. Turner-Watson, Randall Sobie, Michael Schulz, F. X. Gentit, P. G. Estabrooks, J. E. Conboy, A. Michelini, A. Fürtjes, O. Tousignant, Gregor Herten, Peter Sherwood, M. Morii, H. Deng, I. J. Bloodworth, Kiyotomo Kawagoe, P. S. Wells, Peter R Hobson, Alexander Wagner, R. Van Kooten, S. A. Robins, V. Gibson, D. J. Miller, P. Routenburg, B. Wilkens, J. Hagemann, J. Ludwig, K. Runge, P. Bock, T. W. Pritchard, J. Letts, W. Mohr, P. M. Watkins, C.J. Beeston, P. Weber, E. do Couto e Silva, A. Posthaus, J. E. Pilcher, P. Gagnon, D. Rigby, R. J. Hemingway, M. Settles, M. J. Losty, Yoram Rozen, J. Allison, Norbert Wermes, Sherry Towers, T. Kawamoto, M. Foucher, James Pinfold, D. M. Gingrich, J. R. Carter, Erez Etzion, F. S. Merritt, B. W. Kennedy, David Robinson, Stefan Kluth, D. G. Fong, Shlomit Tarem, P. Berlich, P. Jovanovic, G. A. Snow, C. P. Ward, G. T. Zorn, Guenter Duckeck, S. W. O'Neale, S. Orito, M. Rosvick, R. G. Kellogg, R. Lahmann, J. Gascon, K. J. Anderson, D. C. Imrie, P. A. Elcombe, D. L. Rees, S. Söldner-Rembold, A. Yeaman, M. Fanti, H. M. Bosch, Austin Ball, Peter Krieger, Wolfram Dietrich Zeuner, C. J. Oram, Manuella Vincter, Alessandro Montanari, A. S. Turcot, Junichi Kanzaki, Sachio Komamiya, Theodoros Geralis, E. Ros, A. Buijs, D. M. Strom, C. Stegmann, H. Fukui, D. Karlen, C. Burgard, R. W. Springer, G. P. Siroli, J. King, V. H. Winterer, Stefano Marcellini, Christoph Schwick, J. W. Gary, T. P. Kokott, A. Luig, Tohru Takeshita, D. S. Koetke, J. A. McKenna, R. P. Middleton, R. D. Heuer, A. I. McNab, Marcello Mannelli, J. E. Duboscq, J. Goldberg, A. M. Rossi, B. Nellen, F. Scharf, P. Poffenberger, Georges Azuelos, A. D. Schaile, Fabrizio Fabbri, C. Darling, T. J. Smith, Barry King, P. Scharff-Hansen, P. Szymanski, P. Leblanc, K. W. Bell, Peter Fischer, P. Schütz, P. Mättig, Shoji Asai, J. C. Hill, C. Jui, Stan Bentvelsen, Shlomo Dado, A. M. Smith, Misao Sasaki, G. Vasseur, B. Lorazo, H. G. Evans, M. J. Goodrick, I. Cohen, M. W. Redmond, Giora Mikenberg, B. Stockhausen, Paul Kyberd, F. K. Loebinger, R. Giacomelli, O. C. Cooke, N. Capdevielle, J. von Krogh, L. A. del Pozo, C. Sbarra, Michael Dittmar, G. Yekutieli, A. A. Carter, Ron Folman, Roger Jones, P. Utzat, M. G. Rison, T. Hilse, O. Runolfsson, J. G. Layter, Reda Tafirout, Claudio Grandi, C. Charlesworth, Matthias Schröder, T. R. Wyatt, R. J. Barlow, Ehud Duchovni, D. E. Plane, S. G. Clowes, M. Fierro, J. E.G. Edwards, M. Jimack, M. Yurko, P. W. Jeffreys, F. Palmonari, G. M. Dallavalle, G. G. Hanson, S. W. Gensler, S. J. Hillier, T. Kobayashi, P. Bright-Thomas, Alan Watson, J. J. Ward, P. Vikas, U. Müller, G. Giacomelli, W. R. Gibson, P. Schenk, A. Beck, E. Heflin, Stephen Lloyd, M. Tecchio, Lorne Levinson, Robert M Brown, M. S. Dixit, P. D. Phillips, Frans Meijers, Gilles Beaudoin, A. Skillman, C. K. Hargrove, P. E.L. Clarke, R. Kowalewski, U. C. Dunwoody, M. K. Jones, Tara Shears, J. P. Martin, M. Tscheulin, S. De Jong, K. Ametewee, Gideon Alexander, Paolo Capiluppi, H. Przysiezniak, P. A. Hart, B. Nijjhar, M. J. Pearce, K. Stephens, Paolo Giacomelli, M. Hansroul, C. H. Shepherd-Themistocleous, R. J. Homer, D. R. Ward, T. Kress, G. A. Beck, Achim Stahl, P. Teixeira-Dias, D. Hochman, Gideon Bella, H. J. Burckhart, Jacqueline Batley, Xinchou Lou, B. Schmitt, J. C. Clayton, Dave Charlton, Margret Fincke-Keeler, R. Bürgin, and B. Fabbro

Subjects
Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Monte Carlo method, Hadron, Elementary particle, Bose–Einstein correlations, Nuclear physics, High Energy Physics::Experiment, Quantum field theory, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

The production of neutral kaons in e+e− annihilation at centre-of-mass energies in the region of the Z0 mass and their Bose-Einstein correlations are investigated with the OPAL detector at LEP. A total of about 1.26×106 Z0 hadronic decay events are used in the analysis. The production rate of K0 mesons is found to be 1.99±0.01±0.04 per hadronic event, where the first error is statistical and the second systematic. Both the rate and the differential cross section for K0 production are compared to the predictions of Monte Carlo generators. This comparison indicates that the fragmentation is too soft in bothJetset andHerwig. Bose-Einstein correlations in Ks0Ks0 pairs are measured through the quantityQ, the four momentum difference of the pair. A threshold enhancement is observed in Ks0Ks0 pairs originating from a mixed sample of\(K^0 \bar K^0\) and K0K0 (\(\bar K^0 \bar K^0\)) pairs. For the strength of the effect and for the radius of the emitting source we find values of λ=1.14±0.23±0.32 andR0=(0.76±0.10±0.11) fm respectively. The first error is statistical and the second systematic.

124. Improved measurement of the lifetime of the tau lepton

Author

M. Hapke, S. M. Gascon-Shotkin, D. E. Hutchcroft, M. J. Oreglia, P. Poffenberger, Matthew Evans, A. M. Rossi, G. W. Wilson, M. Hauschild, J. R. Carter, G. N. Patrick, P. Schütz, C. Markus, T. J. McMahon, P. Scharff-Hansen, Mathieu Doucet, R. D. Heuer, Fabrizio Fabbri, John Allison, W. J. McDonald, F. S. Merritt, B. C. Shen, Madjid Boutemeur, J. Schwiening, R. K. Carnegie, G. T. Jones, J. A. Wilson, W. Matthews, A. Gaidot, Siegfried Bethke, E. H. Vokurka, P. G. Estabrooks, Stefan Kluth, R. K. Keeler, A. M. Smith, M. A. Thomson, B. Lorazo, Shlomit Tarem, A. K. Honma, B. Nijjhar, W. G. Scott, G. Vasseur, H. M. Fischer, E. Lefebvre, A. Michelini, R. G. Kellogg, D. R. Rust, E. K. U. Gross, S. A. Robins, S. Braibant, F. Odorici, D. Rigby, R. J. Hemingway, R. Bartoldus, M. Sproston, N. Tesch, Csaba Hajdu, Stefano Marcellini, Tara Shears, Otmar Biebel, O. C. Cooke, P. Gagnon, Achim Stahl, J. Bechtluft, J. A. McKenna, P. M. Watkins, Gideon Bella, C. H. Shepherd-Themistocleous, H. J. Burckhart, Jacqueline Batley, B. W. Kennedy, P. Jovanovic, N. K. Watson, Gabriella Pasztor, Gregor Herten, J. von Krogh, N. I. Geddes, Michael Hildreth, N. L. Rodning, A. M. Lee, M. Tecchio, E. von Törne, Austin Ball, B. Poli, Peter Krieger, A. I. McNab, C. Y. Chang, B. Wilkens, P. A. Hart, James Pinfold, S. Yamashita, Sachio Komamiya, P. Igo-Kemenes, W. Mohr, D. G. Fong, C. Lewis, J. Gascon, A. Sittler, Dezso Horvath, M. J. Losty, A. Joly, G. Azuelos, J. Letts, Manuella Vincter, Alessandro Montanari, T. Omori, Norbert Wermes, J. Goldberg, Sherry Towers, T. Kawamoto, A. Posthaus, B. Nellen, G. A. Snow, C. P. Ward, B. Schmitt, J. P. Pansart, Hans-Christian Schultz-Coulon, L. A. del Pozo, C. Sbarra, H. Jeremie, R. E. Hughes-Jones, Randall Sobie, Jean-Arcady Meyer, P. Taras, U. Jost, R. Mir, Silvia Arcelli, Michael Kobel, Michael Schulz, G. D. Lafferty, J. O. Runolfsson, P. Weber, Theodoros Geralis, E. Ros, A. T. Watson, R. Kowalewski, R. Hawking, H. Mes, S. Söldner-Rembold, I. P. Duerdoth, Koji Yoshimura, J. E. Pilcher, G. Yekutieli, A. Malik, J. W. Gary, D. S. Koetke, M. J. Pearce, S. Orito, M. Rosvick, T. Behnke, C. Darling, A. Rooke, R. Howard, J. S. White, P. Fath, T. P. Kokott, H. G. Evans, M. J. Goodrick, A. A. Carter, E. do Couto e Silva, A. Luig, J. G. Layter, Marcello Mannelli, D. L. Rees, Andris Skuja, Ron Folman, Paul Kyberd, Roger Jones, S. Petzold, F. K. Loebinger, H. M. Bosch, E. A. Mckigney, K. Ametewee, J. Steuerer, Paolo Giacomelli, I. Cohen, F. Scharf, German Martinez, M. Hansroul, P. Mättig, G. D. Long, Gideon Alexander, H. Takeda, Julie Kirk, A. D. Schaile, F. G. Oakham, Tetsuro Mashimo, P. Utzat, Shoji Asai, W. P. Lai, Guenter Duckeck, R. W. Springer, Joleen Pater, Paolo Capiluppi, M. Gruwé, Sven Menke, M. G. Rison, Gunter Wolf, F. X. Gentit, Shlomo Dado, C. M. Hawkes, E. L. Barberio, Daniel Lellouch, R. Giacomelli, J. M. Roney, Dave Charlton, Takehiko Mori, A. S. Turcot, W. Gorn, O. Schaile, C. Dallapiccola, R. J. Homer, R. Bürgin, V. Zacek, R. Lahmann, D. C. Imrie, M. Palazzo, D. Axen, A. Jawahery, C. Charlesworth, Giora Mikenberg, S. Wotton, D. Chrisman, E. Tsur, Richard Nisius, Volker Blobel, N. Altekamp, M. Starks, D. M. Strom, M. Verzocchi, K. W. Bell, M. F. Turner-Watson, Peter Sherwood, Alexander Wagner, S. W. O'Neale, R. J. Barlow, D. J. Miller, M. Morii, Peter R Hobson, J. Pálinkás, Stephen Lloyd, J. C. Hill, Matthias Schröder, Marco Cuffiani, K. J. Anderson, M. Thiergen, H. Fukui, R. Rylko, J. Ludwig, K. Runge, P. Bock, J. Lauber, Misao Sasaki, P. Routenburg, S. B. Anderson, P. Szymanski, Ehud Duchovni, Stefania Xella, M. Jimack, S. L. Chu, G. P. Siroli, J. King, F. Strumia, Stan Bentvelsen, P. S. Wells, S. W. Gensler, T. Kobayashi, Terry Richard Wyatt, J. E. Bloomer, P. E.L. Clarke, M. K. Jones, J. P. Martin, M. Tscheulin, S. De Jong, U. Müller, A. J. Martin, H. Przysiezniak, A. N. Bell, I. J. Bloodworth, G. G. Hanson, C. K. Hargrove, G. Giacomelli, P. Schenk, Yoram Rozen, M. S. Dixit, Frans Meijers, M. Foucher, Junichi Kanzaki, D. Karlen, C. Burgard, B. Stockhausen, T. Wlodek, M. Fierro, J. E.G. Edwards, T. Hilse, C. Beeston, Claudio Grandi, Ekg Sarkisyan, P. W. Jeffreys, P. Bright-Thomas, J. J. Ward, P. Vikas, D. Lanske, C. Hartmann, D. E. Plane, Stephen Hillier, G. M. Dallavalle, Reda Tafirout, Frank Fiedler, M. R. Ingram, W. R. Gibson, H. O. Ogren, Christoph Geich-Gimbel, B. T. Bouwens, J. E. Conboy, A. Fürtjes, R. M. Brown, Lorne Levinson, Gilles Beaudoin, A. Skillman, R. Van Kooten, F. Wäckerle, D. M. Gingrich, T. J. Smith, K. Stephens, P. Berlich, V. Gibson, D. R. Ward, H. Lafoux, and T. Kress

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Electron–positron annihilation, Decay length, Impact parameter, Particle Physics - Experiment, Lepton
Abstract

A new measurement of the τ lifetime is presented. It uses data collected with the Opal detector during 1994, which almost doubles the size of the Opal τ sample. Two statistically independent techniques are used: an impact parameter analysis of one-prong decay tracks and a fit to the decay length distribution of three-prong decays. The lifetime obtained from the 1994 data by combining the results of these methods is τ τ = 289.7 ± 2.5 (stat)± 1.5 (sys) fs. When combined with the previous Opal τ lifetime measurement the improved τ lifetime is τ τ = 289.2 ± 1.7 (stat.) ± 1.2 (sys.) fs.

125. A STUDY OF CHARM MESON PRODUCTION IN SEMILEPTONIC B-DECAYS

Author

R. Lahmann, D. C. Imrie, N. J. Oldershaw, Gunter Wolf, M. Settles, T. Hilse, Yoram Rozen, R.J. Akers, D. E. Plane, G. P. Siroli, J. King, O. Runolfsson, M. Foucher, Christoph Schwick, O. Schaile, C. Beeston, S. Wotton, G. M. Dallavalle, Reda Tafirout, Claudio Grandi, P. Igo-Kemenes, Paolo Giacomelli, M. Fanti, T. Behnke, M. Starks, A. J. Martin, A. I. McNab, J. Goldberg, J. Steuerer, H. Jeremie, Junichi Kanzaki, D. Karlen, Alan Watson, U. Müller, H. Mes, I. P. Duerdoth, Eilam Gross, R. E. Hughes-Jones, U. Maur, C. Burgard, Madjid Boutemeur, C. H. Shepherd-Themistocleous, Kiyotomo Kawagoe, B. Nellen, A. Jawahery, P. Fath, R. J. Homer, R. W. Springer, K. Stephens, P. Weber, Otmar Biebel, Gregor Herten, P. Leblanc, C. M. Hawkes, W. R. Gibson, A. Beck, E. do Couto e Silva, Daniel Lellouch, D. L. Wagner, C. K. Hargrove, H. M. Fischer, G. A. Beck, Achim Stahl, P. Teixeira-Dias, S. G. Clowes, E. Heflin, Lorne Levinson, P. D. Phillips, Gilles Beaudoin, A. Skillman, Tohru Takeshita, G. G. Hanson, H. G. Evans, M. J. Goodrick, I. Cohen, R. D. Heuer, Shlomo Dado, P. Poffenberger, H. Deng, Fabrizio Fabbri, Dave Charlton, B. Wilkens, Matthias Schröder, Peter Fischer, M. Fierro, P. Schütz, B. Schmitt, T. Kobayashi, J. E.G. Edwards, M. Yurko, V. Zacek, Marco Cuffiani, P. G. Estabrooks, A. S. Turcot, Georges Azuelos, J. Letts, P. W. Jeffreys, James Pinfold, D. G. Fong, J. Gascon, J. E. Pilcher, Tara Shears, V. H. Winterer, Erez Etzion, R. Van Kooten, A. Michelini, Barry King, Stefan Kluth, D. Axen, Shlomit Tarem, Norbert Wermes, G. W. Wilson, Sherry Towers, T. Kawamoto, R. Bürgin, P. Le Du, B. Fabbro, S. L. Chu, P. Bright-Thomas, Margret Fincke-Keeler, P. A. Hart, M. Hauschild, C. Y. Chang, C. J. Oram, K. W. Bell, P. M. Watkins, V. Gibson, Peter Sherwood, G. Giacomelli, P. Taras, R. P. Middleton, P. Schenk, S. Orito, Alexander Wagner, C. Markus, Michael Kobel, E. Lefebvre, M. J. Pearce, Giora Mikenberg, M. Rosvick, J. J. Ward, Gideon Bella, P. Vikas, J. C. Hill, Misao Sasaki, Richard Keeler, I. Mori, Hans-Christian Schultz-Coulon, F. Odorici, J. Hagemann, Julie Kirk, H. Lafoux, S. A. Robins, M. W. Redmond, J. Ludwig, C. Darling, H. J. Burckhart, T. J. Smith, Jacqueline Batley, B. C. Shen, Randall Sobie, Michael Schulz, G. D. Lafferty, D. M. Gingrich, J. W. Gary, K. Runge, P. Bock, M. S. Dixit, Silvia Arcelli, D. R. Ward, D. S. Koetke, T. Kress, Frans Meijers, K. Ametewee, P. Berlich, O. Tousignant, P. Mättig, Shoji Asai, John Allison, M. Hausroul, S. Braibant, Siegfried Bethke, A. K. Honma, B. Nijjhar, T. W. Pritchard, Marcello Mannelli, J. E. Duboscq, Gideon Alexander, W. G. Scott, P. E.L. Clarke, M. J. Oreglia, U. C. Dunwoody, M. K. Jones, Andris Skuja, S. W. O'Neale, P. Gagnon, J. P. Martin, D. R. Rust, W. P. Lai, Paolo Capiluppi, M. Tscheulin, K. J. Anderson, Guenter Duckeck, Xinchou Lou, G. D. Long, Tetsuro Mashimo, R. G. Kellogg, S. De Jong, R. Kowalewski, J. R. Carter, J. M. Roney, A. M. Lee, G. N. Patrick, Stefano Marcellini, E. X. Gentit, P. Szymanski, H. Przysiezniak, G. A. Snow, C. P. Ward, D. L. Rees, M. J. Losty, S. Söldner-Rembold, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Ehud Duchovni, C. Jui, D. Hochman, Stan Bentvelsen, G. T. Zorn, W. Gorn, R. Giacomelli, H. M. Bosch, J. C. Clayton, M. Jimack, Wolfram Dietrich Zeuner, N. I. Geddes, S. W. Gensler, S. J. Hillier, P. Scharff-Hansen, N. L. Rodning, A. M. Smith, G. Vasseur, B. Poli, B. Lorazo, Stephen Lloyd, M. Tecchio, Robert M Brown, R. Howard, Claude Leroy, J. P. Pansart, A. M. Rossi, T. J. McMahon, J. Schwiening, A. Buijs, R. K. Carnegie, D. M. Strom, C. Stegmann, M. Diumar, H. Fukui, J. A. Wilson, A. Yeaman, Sachio Komamiya, Theodoros Geralis, E. Ros, T. P. Kokott, A. Luig, Z. Li, P. S. Wells, M. F. Turner-Watson, O. C. Cooke, M. Morii, Peter R Hobson, Terry Richard Wyatt, P. Routenburg, R. Bartoldus, N. Capdevielle, J. von Krogh, H. O. Ogren, Christoph Geich-Gimbel, Dave Robinson, L. A. del Pozo, J. E. Conboy, A. Fürtjes, C. Sbarra, G. Yekutieli, F. S. Merritt, A. A. Carter, Ron Folman, Roger Jones, P. Utzat, J. A. McKenna, M. G. Rison, N. K. Watson, W. Mohr, A. Posthaus, P. A. Elcombe, F. Scharf, A. D. Schaile, W. Matthews, M. A. Thomson, A. Gaidot, T. Wlodek, M. Sproston, T. Tsukamoto, N. Tesch, C. Dallapiccola, J. D. Gillies, R. J. Barlow, D. J. Miller, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, R. Mir, J. Lauber, H. Takeda, F. G. Oakham, E. L. Barberio, J. G. Layter, C. Charlesworth, and I. J. Bloodworth

Subjects
Physics, Nuclear physics, Particle physics, Meson production, Muon, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

The results of a study of charm meson production in semileptonic B hadron decays are presented. Based on a sample of 1.72 million hadronic Z0 decays the following product branching ratios (averaged over electrons and muons) are obtained: $$\begin{gathered} B(b \to D^ + \ell X) \cdot B(D^ + \to K^ - \pi ^ + \pi ^ + ) \hfill \\ = (1.82 \pm 0.20 \pm 0.12) \times 10^{ - 3} , \hfill \\ B(b \to D^0 \ell X) \cdot B(D^0 \to K^ - \pi ^ + ) \hfill \\ = (2.52 \pm 0.14 \pm 0.17) \times 10^{ - 3} \hfill \\ B(b \to D^* \ell X) \cdot B(D^{* + } \to D^0 \pi ^ + ) \cdot B(D^0 \to K^ - \pi ^ + ) \hfill \\ = (7.53 \pm 0.47 \pm 0.56) \times 10^{ - 4} \hfill \\ \end{gathered} $$ where the first error is statistical and the second systematic.

126. Search for charged Higgs bosons using the OPAL detector at LEP

Author

M. Hapke, Siegfried Bethke, A. K. Honma, D. E. Hutchcroft, B. Nijjhar, W. G. Scott, C. Dallapiccola, N. J. Oldershaw, D. R. Rust, A. M. Lee, O. Schaile, M. Tecchio, E. von Törne, K. Ametewee, R. Kowalewski, N. K. Watson, Gideon Alexander, Paolo Capiluppi, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, N. Altekamp, M. J. Oreglia, C. M. Hawkes, Daniel Lellouch, Takehiko Mori, V. Zacek, E. Lefebvre, R. J. Barlow, D. J. Miller, C. Darling, T. J. Smith, P. Mättig, Shoji Asai, J. R. Carter, O. C. Cooke, F. Odorici, G. W. Wilson, M. Hauschild, G. N. Patrick, J. Palinkas, C. Hartmann, D. E. Plane, Ehud Duchovni, C. Markus, W. Mohr, A. Posthaus, P. Scharff-Hansen, R. W. Springer, T. Hilse, J. von Krogh, M. Jimack, Yoram Rozen, Shlomo Dado, G. M. Dallavalle, Otmar Biebel, O. Runolfsson, M. Foucher, T. Behnke, Gideon Bella, E. H. Vokurka, F. Palmonari, R. J. Hawkings, F. S. Merritt, J. Steuerer, C. H. Shepherd-Themistocleous, H. J. Burckhart, R. D. Heuer, L. A. del Pozo, C. Sbarra, D. Karlen, P. Gagnon, Tara Shears, D. Rigby, R. J. Hemingway, S. W. Gensler, C. Burgard, D. L. Wagner, Fabrizio Fabbri, Alan Watson, Eilam Gross, C. Beeston, S. J. Hillier, E. Tsur, Richard Keeler, Jacqueline Batley, Claudio Grandi, B. W. Kennedy, R. Van Kooten, K. W. Bell, P. Jovanovic, U. C. Dunwoody, Austin Ball, Giora Mikenberg, D. L. Rees, W. R. Gibson, G. Yekutieli, Peter Krieger, A. Sittler, I. J. Blood worth, J. C. Hill, G. Azuelos, P. A. Hart, B. T. Bouwens, Gregor Herten, Misao Sasaki, A. A. Carter, J. Bechtluft, J. A. McKenna, F. Scharf, Manuella Vincter, Alessandro Montanari, Stefan Kluth, F. Wäckerle, German Martinez, Richard Nisius, Ron Folman, Roger Jones, A. M. Smith, Shlomit Tarem, D. M. Gingrich, H. M. Bosch, T. Omori, S. W. O'Neale, B. Wilkens, M. J. Pearce, Lorne Levinson, U. Jost, R. Mir, H. Mes, I. P. Duerdoth, K. J. Anderson, A. D. Schaile, R. Howard, D. Chrisman, J. Letts, Marco Cuffiani, W. Matthews, P. Berlich, P. D. Phillips, B. J. King, Gilles Beaudoin, P. Utzat, S. L. Chu, S. Braibant, Gabriella Pasztor, J. Lauber, J. P. Pansart, A. Skillman, R. Bartoldus, P. Fath, C. Y. Chang, M. A. Thomson, J. E. Pilcher, M. G. Rison, H. Takeda, Norbert Wermes, Sherry Towers, G. Vasseur, B. Lorazo, John Allison, C. J. Oram, T. Kawamoto, G. A. Snow, C. P. Ward, F. G. Oakham, P. Taras, H. O. Ogren, Christoph Geich-Gimbel, Michael Kobel, Stephen Lloyd, S. Söldner-Rembold, E. L. Barberio, S. G. Clowes, M. Fierro, T. Wlodek, M. Sproston, T. J. McMahon, D. M. Strom, J. Schwiening, J. E. Conboy, Robert M Brown, J. E.G. Edwards, C. Stegmann, R. K. Carnegie, S. Orito, F. Strumia, Reda Tafirout, Julie Kirk, Matthias Schröder, T. Tsukamoto, N. Tesch, A. I. McNab, H. Fukui, J. A. Wilson, R. Rylko, M. Rosvick, J. Goldberg, Ekg Sarkisyan, P. W. Jeffreys, A. Fürtjes, P. Poffenberger, James Pinfold, B. Nellen, T. Kobayashi, P. Schütz, D. G. Fong, C. Lewis, P. Bright-Thomas, D. Axen, P. S. Wells, A. Jawahery, A. Gaidot, Dave Charlton, J. J. Ward, P. Vikas, J. Gascon, U. Müller, Terry Richard Wyatt, J. E. Bloomer, Peter Sherwood, D. Lanske, A. J. Martin, H. G. Evans, Alexander Wagner, M. J. Goodrick, I. Cohen, J. Ludwig, K. Runge, P. Bock, R. G. Kellogg, C. K. Hargrove, Gunter Wolf, F. X. Gentit, M. F. Turner-Watson, M. Morii, Peter R Hobson, P. Routenburg, Csaba Hajdu, S. Wotton, R. Bürgin, B. Fabbro, A. Malik, Stefano Marcellini, J. W. Gary, D. S. Koetke, R. Lahmann, D. C. Imrie, M. Palazzo, G. Giacomelli, Marcello Mannelli, Andris Skuja, G. P. Siroli, J. King, Sachio Komamiya, G. D. Long, Tetsuro Mashimo, Theodoros Geralis, E. Ros, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Joleen Pater, T. P. Kokott, W. Gorn, A. Luig, P. Weber, R. Giacomelli, A. Joly, S. Yamashita, P. Igo-Kemenes, Margret Fincke-Keeler, H. Jeremie, R. E. Hughes-Jones, E. do Couto e Silva, Sven Menke, G. A. Beck, Achim Stahl, P. E.L. Clarke, M. K. Jones, B. Schmitt, J. P. Martin, M. Tscheulin, S. De Jong, Paolo Giacomelli, M. Hansroul, H. Przysiezniak, R. J. Homer, A. N. Bell, N. I. Geddes, Michael Hildreth, N. L. Rodning, B. Poli, J. G. Layter, H. M. Fischer, A. Michelini, C. Charlesworth, S. A. Robins, Stefania Xella, G. G. Hanson, S. M. Gascon-Shotkin, P. Schenk, A. M. Rossi, M. S. Dixit, Frans Meijers, Silvia Arcelli, E. A. Mckigney, W. P. Lai, J. M. Roney, Madjid Boutemeur, P. G. Estabrooks, M. St arks, P. M. Watkins, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, T. W. Pritchard, Guenter Duckeck, A. S. Turcot, S. B. Anderson, P. Szymanski, Stan Bentvelsen, K. Stephens, V. Gibson, D. R. Ward, H. Lafoux, T. Kress, Frank Fiedler, D. Hochman, W. J. McDonald, and B. C. Shen

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Electron–positron annihilation, High Energy Physics::Phenomenology, Detector, Upper and lower bounds, Lower limit, Nuclear physics, Higgs boson, High Energy Physics::Experiment, Particle Physics - Experiment, Boson
Abstract

A search is described to detect charged Higgs bosons via the process Z0 → H+H−, using data collected by the OPAL detector at LEP which correspond to an integrated luminosity of approximately 110 pb−1. It is assumed that the H+ boson decays only to τ+ντ and cs final states. From the negative outcome of this search a lower bound of 44.1 GeV (95% CL) is derived for the mass of the charged Higgs boson.

127. INCLUSIVE STRANGE VECTOR AND TENSOR MESON PRODUCTION IN HADRONIC Z(0) DECAYS

Author

G. D. Long, Otmar Biebel, A. S. Turcot, Tetsuro Mashimo, D. L. Wagner, W. Gorn, V. H. Winterer, H. Deng, J. G. Layter, P. A. Elcombe, Gregor Herten, J. Letts, D. Hochman, C. Charlesworth, Madjid Boutemeur, B. Wilkens, J. P. Pansart, Tara Shears, Norbert Wermes, Sherry Towers, T. Kawamoto, Richard Keeler, Kiyotomo Kawagoe, P. Szymanski, P. A. Hart, C. Jui, Stan Bentvelsen, Hans-Christian Schultz-Coulon, J. E. Pilcher, Randall Sobie, Michael Schulz, G. D. Lafferty, M. J. Pearce, T. W. Pritchard, Guenter Duckeck, P. Scharff-Hansen, R. Bartoldus, A. I. McNab, J. C. Clayton, S. Orito, M. Rosvick, J. Goldberg, R. Howard, Claude Leroy, F. Scharf, C. Y. Chang, J. Steuerer, P. Igo-Kemenes, A. M. Smith, B. Nellen, C. Sbarra, U. Müller, P. Leblanc, A. D. Schaile, G. Vasseur, B. Lorazo, T. Hilse, P. G. Estabrooks, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, J. P. Martin, M. Tscheulin, P. Weber, H. O. Ogren, Christoph Geich-Gimbel, E. Lefebvre, B. C. Shen, S. De Jong, G. W. Wilson, M. Fanti, H. Jeremie, M. F. Turner-Watson, P. Taras, H. G. Evans, M. Morii, James Pinfold, M. J. Goodrick, I. Cohen, F. Odorici, Siegfried Bethke, M. Hauschild, H. Przysiezniak, Peter R Hobson, C. K. Hargrove, A. M. Rossi, S. Braibant, M. J. Oreglia, R. E. Hughes-Jones, D. G. Fong, O. Runolfsson, U. Maur, Paolo Giacomelli, A. K. Honma, J. Gascon, D. E. Plane, B. Nijjhar, W. G. Scott, M. Hansroul, W. Matthews, Michael Kobel, C. Markus, K. Stephens, M. A. Thomson, Matthias Schröder, P. Routenburg, Michael Dittmar, A. Buijs, D. M. Strom, C. Stegmann, Erez Etzion, G. G. Hanson, Marco Cuffiani, Stefan Kluth, G. Yekutieli, J. E. Conboy, E. K. U. Gross, C. H. Shepherd-Themistocleous, T. Wlodek, M. Sproston, J. W. Gary, J. R. Carter, D. S. Koetke, N. J. Oldershaw, Marcello Mannelli, J. E. Duboscq, C. Dallapiccola, G. N. Patrick, C. Beeston, P. M. Watkins, H. Fukui, G. A. Snow, C. P. Ward, Shlomit Tarem, G. M. Dallavalle, G. Giacomelli, Stephen Lloyd, A. Fürtjes, R.J. Akers, C. J. Oram, M. J. Losty, B. Stockhausen, Paul Kyberd, F. K. Loebinger, R. J. Homer, D. L. Rees, P. Schenk, Sachio Komamiya, M. Tecchio, Theodoros Geralis, E. Ros, S. Söldner-Rembold, Margret Fincke-Keeler, M. S. Dixit, J. D. Gillies, Frans Meijers, V. Gibson, R. P. Middleton, N. I. Geddes, Ehud Duchovni, R. D. Heuer, Fabrizio Fabbri, M. Jimack, S. L. Chu, Alan Watson, Julie Kirk, H. Lafoux, E. do Couto e Silva, T. Tsukamoto, N. Tesch, N. K. Watson, Gunter Wolf, F. X. Gentit, H. Mes, D. R. Ward, T. Kress, T. P. Kokott, Claudio Grandi, R. Lahmann, D. C. Imrie, A. Luig, F. Palmonari, N. L. Rodning, O. Schaile, S. W. Gensler, S. J. Hillier, T. Kobayashi, R. W. Springer, S. Wotton, F. S. Merritt, P. S. Wells, D. R. Rust, Tohru Takeshita, I. P. Duerdoth, P. Fath, Shlomo Dado, A. A. Carter, Ron Folman, R. Giacomelli, Roger Jones, R. J. Barlow, D. J. Miller, B. Poli, Terry Richard Wyatt, G. P. Siroli, J. King, W. Mohr, Christoph Schwick, M. Starks, P. Poffenberger, A. Posthaus, Georges Azuelos, Barry King, A. J. Martin, A. M. Lee, P. Utzat, Reda Tafirout, R. Kowalewski, Gideon Bella, K. W. Bell, Giora Mikenberg, John Allison, Peter Fischer, J. C. Hill, Misao Sasaki, R. Mir, H. J. Burckhart, G. A. Beck, M. G. Rison, K. Ametewee, H. M. Fischer, Achim Stahl, Jacqueline Batley, P. Teixeira-Dias, A. Michelini, Gideon Alexander, P. Schütz, J. Lauber, Paolo Capiluppi, A. Yeaman, R. Van Kooten, J. A. McKenna, R. G. Kellogg, A. Gaidot, T. J. McMahon, H. Takeda, S. A. Robins, W. R. Gibson, Stefano Marcellini, F. G. Oakham, B. Schmitt, E. L. Barberio, D. M. Gingrich, D. Rigby, R. J. Hemingway, A. Beck, J. Schwiening, P. Berlich, E. Heflin, Xinchou Lou, O. Tousignant, R. K. Carnegie, R. M. Brown, Lorne Levinson, M. W. Redmond, B. W. Kennedy, P. Jovanovic, P. D. Phillips, Austin Ball, Peter Krieger, Gilles Beaudoin, J. A. Wilson, Manuella Vincter, A. Skillman, Alessandro Montanari, S. W. O'Neale, Dave Charlton, K. J. Anderson, R. Bürgin, B. Fabbro, O. C. Cooke, N. Capdevielle, J. von Krogh, Dave Robinson, L. A. del Pozo, Silvia Arcelli, W. P. Lai, J. M. Roney, T. Behnke, D. Axen, A. Jawahery, Peter Sherwood, S. G. Clowes, M. Fierro, J. E.G. Edwards, M. Yurko, P. W. Jeffreys, Alexander Wagner, J. Hagemann, J. Ludwig, K. Runge, P. Bock, P. Bright-Thomas, J. J. Ward, P. Vikas, P. Gagnon, G. T. Zorn, H. M. Bosch, Wolfram Dietrich Zeuner, C. Darling, T. J. Smith, P. Mättig, Shoji Asai, C. M. Hawkes, Daniel Lellouch, Takehiko Mori, V. Zacek, I. J. Bloodworth, M. Settles, Yoram Rozen, M. Foucher, Junichi Kanzaki, D. Karlen, C. Burgard, and Andris Skuja

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Hadron, Elementary particle, State (functional analysis), Nuclear physics, Field theory (psychology), Tensor, Quantum field theory, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

Measurements have been made in the OPAL experiment at LEP of the inclusive production of strange vector φ(1020) and K*(892)0 mesons, and the tensor meson K2*(1430)0. The overall production rates per hadronic Z0 decay have been determined to be 0.100±0.004stat.±0.007syst. φ(1020) mesons, 0.74±0.03stat.±0.03syst. K*(892)0 mesons and (forxE

128. IMPROVED MEASUREMENTS OF THE B-0 AND B+ MESON LIFETIMES

Author

Silvia Arcelli, Sachio Komamiya, Theodoros Geralis, R. Bartoldus, T. J. Smith, O. Tousignant, A. T. Watson, S. W. O'Neale, C. Y. Chang, K. J. Anderson, P. Taras, Michael Kobel, Julie Kirk, G. G. Hanson, H. O. Ogren, Christoph Geich-Gimbel, K. Stephens, H. Mes, T. P. Kokott, A. Luig, G. Giacomelli, I. P. Duerdoth, T. Hilse, R. W. Springer, P. Schenk, A. I. McNab, P. Poffenberger, Peter Fischer, P. Fath, P. Schütz, Dave Charlton, W. P. Lai, J. M. Roney, Tohru Takeshita, Otmar Biebel, Claudio Grandi, M. Yurko, R. W. L. Jones, P. W. Jeffreys, P. Scharff-Hansen, W. R. Gibson, G. D. Lafferty, J. Goldberg, B. Nellen, Madjid Boutemeur, P. S. Wells, Georges Azuelos, Barry King, C. M. Hawkes, M. S. Dixit, P. Gagnon, F. X. Gentit, Margret Fincke-Keeler, J. E. Conboy, A. Fürtjes, R. Bürgin, B. Fabbro, R. Van Kooten, Frans Meijers, T. J. McMahon, A. Beck, D. L. Wagner, K. W. Bell, R. Kowalewski, E. Lefebvre, E. Heflin, P. G. Estabrooks, R. K. Keeler, C.J. Beeston, J. G. Layter, Gregor Herten, T. G. Shears, J. Allison, P. Leblanc, P. Bright-Thomas, F. Odorici, S. Braibant, J. C. Hill, Misao Sasaki, K. Ametewee, D. R. Ward, J. Schwiening, A. M. Smith, A. M. Rossi, T. Kress, D. M. Gingrich, Gideon Alexander, R. K. Carnegie, F. S. Merritt, D. Rigby, R. J. Hemingway, J. Steuerer, B. C. Shen, Lorne Levinson, P. M. Watkins, P. Berlich, J. J. Ward, Siegfried Bethke, Paolo Capiluppi, P. Vikas, M. A. Thomson, A. K. Honma, W. G. Scott, G. Vasseur, H. M. Fischer, C. Darling, P. D. Phillips, Kiyotomo Kawagoe, C. Charlesworth, B. W. Kennedy, H. G. Evans, M. Fanti, A. Michelini, Gideon Bella, G. T. Zorn, J. A. Wilson, Gilles Beaudoin, P. Igo-Kemenes, H. Deng, Fabrizio Fabbri, J. Letts, A. Skillman, P. E.L. Clarke, H. J. Burckhart, D. R. Rust, Jacqueline Batley, Norbert Wermes, P. Jovanovic, B. Lorazo, Andris Skuja, M. J. Goodrick, I. Cohen, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, U. C. Dunwoody, M. K. Jones, Ehud Duchovni, Sherry Towers, H. Jeremie, T. Kawamoto, A. D. Schaile, A. S. Turcot, T. R. Wyatt, M. Jimack, J. P. Martin, R. Mir, R. E. Hughes-Jones, G. D. Long, Tetsuro Mashimo, J. A. McKenna, H. M. Bosch, A. M. Lee, U. Maur, S. Orito, M. Tscheulin, S. A. Robins, R. J. Barlow, Wolfram Dietrich Zeuner, P. Weber, F. Palmonari, S. De Jong, M. Rosvick, G. A. Snow, C. P. Ward, S. G. Clowes, D. Hochman, B. Wilkens, M. Fierro, J. E.G. Edwards, S. W. Gensler, D. E. Plane, V. Gibson, H. Takeda, R. D. Heuer, D. L. Rees, W. Gorn, P. Mättig, S. J. Hillier, R. Howard, G. M. Dallavalle, M. J. Oreglia, S. Söldner-Rembold, J. R. Carter, H. Przysiezniak, B. Stockhausen, Paul Kyberd, Claude Leroy, M. J. Losty, F. K. Loebinger, Shoji Asai, T. Kobayashi, Erez Etzion, F. G. Oakham, E. L. Barberio, E. do Couto e Silva, J. P. Pansart, Marco Cuffiani, J. E. Pilcher, O. C. Cooke, V. H. Winterer, David Robinson, G. N. Patrick, O. Runolfsson, Stefan Kluth, M. W. Redmond, Shlomit Tarem, C. Dallapiccola, S. L. Chu, J. D. Gillies, R. Giacomelli, R. Lahmann, D. C. Imrie, J. C. Clayton, A. Buijs, G. W. Wilson, M. Hauschild, D. M. Strom, C. Stegmann, James Pinfold, N. I. Geddes, C. J. Oram, Eduardo Ros, Shlomo Dado, J.A. Lauber, G. P. Siroli, J. King, H. Fukui, T. Behnke, C. Markus, Reda Tafirout, Christoph Schwick, D. J. Miller, D. G. Fong, N. Capdevielle, J. von Krogh, R. G. Kellogg, J. Gascon, X. C. Lou, Stefano Marcellini, Daniel Lellouch, R. P. Middleton, N. J. Oldershaw, N. L. Rodning, D. Axen, Hans-Christian Schultz-Coulon, R.J. Akers, A. Jawahery, Gunter Wolf, Giora Mikenberg, Stephen Lloyd, Randall Sobie, G. A. Beck, L. A. del Pozo, M. Tecchio, Robert M Brown, C. Sbarra, Peter Sherwood, Achim Stahl, O. Schaile, J. W. Gary, D. S. Koetke, Alexander Wagner, J. Hagemann, Marcello Mannelli, J. E. Duboscq, Takehiko Mori, J. Ludwig, K. Runge, P. Bock, Michael Dittmar, Michael Schulz, G. Yekutieli, P. Teixeira-Dias, B. Poli, S. Wotton, A. A. Carter, M. Starks, Ron Folman, A. J. Martin, P. Utzat, M. G. Rison, B. Schmitt, T. W. Pritchard, V. Zacek, A. Yeaman, G. Duckeck, M. F. Turner-Watson, M. Morii, Peter R Hobson, I. J. Bloodworth, P. Routenburg, P. Szymanski, Paolo Giacomelli, M. Hansroul, M. Settles, Yoram Rozen, M. Foucher, C. H. Shepherd-Themistocleous, C. Jui, R. J. Homer, Stan Bentvelsen, Junichi Kanzaki, D. Karlen, C. Burgard, Matthias Schröder, H. Lafoux, N. K. Watson, W. Mohr, A. Posthaus, P. A. Elcombe, F. Scharf, U. Müller, W. Matthews, E. K. U. Gross, A. Gaidot, T. Wlodek, M. Sproston, T. Tsukamoto, N. Tesch, C. K. Hargrove, P. A. Hart, B. Nijjhar, and M. J. Pearce

Subjects
Nuclear physics, Physics, Decay time, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Hadron, B meson, Elementary particle, Engineering (miscellaneous), Particle Physics - Experiment
Abstract

Updated measurements of the B0 and B+ meson lifetimes are presented. From a data sample of 1.72 million hadronic Z0 decays recorded during the period 1991 to 1993, a sample of approximately 1000 semileptonic B meson decays containing a D0, D+ or D*+ has been isolated. From the distribution of decay times in the different samples the lifetimes of the B0 and B+ mesons are determined to be 1.53±0.12±0.08 ps and 1.52±0.14±0.09 ps, respectively, where the first error is statistical and the second systematic. The ratio of the B+ to B0 lifetimes is measured to be 0.99±0.14−0.04+0.05, confirming expectations that the lifetimes are similar.

129. A STUDY OF MUON PAIR PRODUCTION AND EVIDENCE FOR TAU PAIR PRODUCTION IN PHOTON-PHOTON COLLISIONS AT LEP

Author

G. T. Zorn, Tohru Takeshita, A. M. Rossi, Georges Azuelos, H. Mes, I. P. Duerdoth, T. Tsukamoto, C. M. Hawkes, M. Cooper, Daniel Lellouch, Takehiko Mori, J. F. Kral, K. W. Bell, R. J. Hemingway, P. F. Harrison, Max Weber, G. Beaudoin, T. J. McMahon, Stephen Lloyd, M. Tecchio, Madjid Boutemeur, P. Jovanovic, Austin Ball, Otmar Biebel, J. Schwiening, R. K. Carnegie, J. C. Hill, Misao Sasaki, D. Menszner, F. S. Merritt, P. G. Estabrooks, J. Banks, N. J. Tresilian, Alessandro Montanari, J. A. Wilson, Shlomo Dado, M. Hauschild, G. E. Richards, C. Y. Chang, D. G. Charlton, D. L. Wagner, H. M. Fischer, J. C. Clayton, A. Michelini, M. F. Turner, A. C. Janissen, Ehud Duchovni, M. Jimack, R. D. Heuer, J. Hart, Fabrizio Fabbri, D. Van den plas, P. Igo-Kemenes, W. Schappert, P. M. Watkins, P. A. Elcombe, N. I. Geddes, B. Boden, B. Poli, I. J. Bloodworth, C. Markus, X. C. Lou, J. A. McKenna, H. Ihssen, J. D. Gillies, D. A. Hinshaw, P. E.L. Clarke, H. Jeremie, H. Deng, R. Humbert, C. Sbarra, P. Paschievici, S. W. Gensler, Michael Dittmar, M. Settles, R. E. Hughes-Jones, U. Maur, James Pinfold, P. S. Wells, S. J. Hillier, J. Goldberg, T. Kobayashi, Matthias Schröder, Silvia Arcelli, D. R. Rust, G. Yekutieli, J. P. Martin, Giora Mikenberg, M. Mori, R. J. Barlow, J. Steuerer, D. G. Fong, D. J. Miller, M. Foucher, E. Lefebvre, Terry Richard Wyatt, B. C. Shen, T. Behnke, A. A. Carter, Roger Jones, R. Van Kooten, B. Nellen, J. Becker, K. Stephens, P. Leblanc, S. De Jong, R. Bartoldus, M. Coupland, J. Gascon, H. von der Schmitt, E. do Couto e Silva, H. O. Ogren, Christoph Geich-Gimbel, Norbert Wermes, M. G. Rison, A. M. Lee, J. R. McNutt, Sherry Towers, G. W. Wilson, F. Odorici, D. Axen, D. Karlen, C. Burgard, H. Lafoux, N. Paz-Jaoshvili, A. Jawahery, T. Kawamoto, R.J. Akers, J. W. Gary, J. M. Roney, V. Gibson, G. Quast, Peter Sherwood, P. Poffenberger, W. R. Gibson, Marcello Mannelli, J. E. Duboscq, J. Kroll, F. X. Gentit, G. A. Snow, C. P. Ward, H. Przysiezniak, J. Lauber, D. L. Rees, M. Fierro, H. G. Evans, John Baines, D. Pitman, M. H. Lehto, J. von Krogh, A. K. Honma, W. G. Scott, R. W. Springer, Alexander Wagner, J. Hagemann, Peter R Hobson, Andris Skuja, J. Ludwig, K. Runge, P. Bock, S. Orito, M. Rosvick, J. E. Conboy, M. J. Goodrick, I. Cohen, M. Jones, Richard Keeler, O. Schaile, H. Takeda, R. Mir, R. Yaari, Gideon Alexander, Dave Robinson, Paolo Capiluppi, L. A. del Pozo, T. J. Smith, A. Beck, F. G. Oakham, T. Hilse, S. Bethke, O. Runolfsson, Marco Cuffiani, E. Heflin, P. Routenburg, D. R. Ward, G. Transtromer, R. Kowalewski, D. M. Gingrich, Tetsuro Mashimo, A. Astbury, Sachio Komamiya, Randall Sobie, G. D. Lafferty, R. M. Brown, S. L. Chu, Lorne Levinson, Gunter Wolf, P. Berlich, U. Müller, C. Beeston, E. Ros, Claudio Grandi, B. W. Kennedy, A. J. Martin, G. Duckeck, R. Ströhmer, Claude Leroy, E. Torrente-Lujan, P. Mättig, J. P. Pansart, M. J. Losty, M. J. Oreglia, M. Yurko, S. A. Robins, P. W. Jeffreys, T. P. Kokott, A. Luig, F. C. Grant, M. A. Whalley, John Hobbs, H. M. Bosch, Gregor Herten, Wolfram Dietrich Zeuner, W. Gorn, C. Wahl, P. Bright-Thomas, B. Wilkens, S. W. O'Neale, K. J. Anderson, S. Wotton, A. Buijs, C. K. Hargrove, Tara Shears, J. R. Carter, G. N. Patrick, D. M. Strom, C. Stegmann, J. E. Pilcher, T. W. Pritchard, M. J. Pearce, Horst Breuker, D. E. Plane, P. Bentkowski, A. Yeaman, N. K. Watson, G. Giacomelli, G. M. Dallavalle, P. Scharff-Hansen, Alan Watson, D. J.P. Dumas, A. D. Schaile, P. Schenk, M. S. Dixit, A. M. Smith, G. Vasseur, B. Lorazo, Frans Meijers, Erez Etzion, J. G. Layter, C. Jui, Stefan Kluth, Shlomit Tarem, S. Rossberg, C. J. Oram, R. P. Middleton, V. H. Winterer, P. M. Hattersley, R. Lahmann, D. C. Imrie, G. P. Siroli, J. King, Christoph Schwick, Kiyotomo Kawagoe, P. Weber, J. Mildenberger, Harold Nguyen, Gordon H. Hanson, M. W. Redmond, Paul Kyberd, F. K. Loebinger, A. Rollnik, R. Giacomelli, S. Barnett, D. Hochman, John Allison, R. G. Kellogg, D. S. Koetke, Stefano Marcellini, James Letts, F. Scharf, G. J. VanDalen, J. M. Lorah, W. Mohr, A. Skillman, M. A. Thomson, A. Gaidot, T. Wlodek, M. Sproston, N. Tesch, A. Dieckmann, Margret Fincke-Keeler, B. Fabbro, B. Panzer-Steindel, P. Pfister, Gideon Bella, H. J. Burckhart, Jacqueline Batley, C. Moisan, G. A. Beck, Achim Stahl, P. Teixeira-Dias, B. Schmitt, M. Hansroul, C. H. Shepherd-Themistocleous, and R. J. Homer

Subjects
Nuclear physics, Physics, Range (particle radiation), Pair production, Muon, Photon, Luminosity (scattering theory), Physics and Astronomy (miscellaneous), Elementary particle, Electron, Engineering (miscellaneous), Photon structure function, Particle Physics - Experiment
Abstract

We have studied the reactionsγγ→μ + μ − andγγ→τ + τ − by measuring the properties of events of the typese + e −→e + e − μ + μ − ande + e −→e + e − τ + τ − ate + e − centre-of-mass energies between 88 and 94 GeV. The data sample corresponds to an integratede + e − luminosity of 40.4 pb−1 collected by the OPAL detector at LEP. The QED structure functionF 2 is extracted from a sample of 1462γγ→μ + μ − events in which one photon is off the mass shell (single-tagged). TheQ 2 range for these massive photons is 4–400 GeV2, with an averageQ 2 of 8 GeV2. We have observed 48e + e −→e + e − μ + μ − events in which both final state electrons are detected. In the sample of single-tag events we have identified 34.9±6.7 events as due to the reactionγ;→τ + τ −, on an estimated background of 5.1±2.7 events. In all cases the measured event distributions agree with QED calculations.

130. A study of four-fermion final states with high multiplicity at LEP

Author

E. Lefebvre, J. Palinkas, Shlomo Dado, F. Odorici, Giora Mikenberg, Daniel Lellouch, Takehiko Mori, Dave Charlton, Silvia Arcelli, R. Bürgin, V. Zacek, S. Yamashita, P. Igo-Kemenes, W. Matthews, H. Jeremie, R. E. Hughes-Jones, G. Giacomelli, V. Gibson, E. do Couto e Silva, P. Weber, H. Mes, Sven Menke, I. P. Duerdoth, P. Fath, M. A. Thomson, N. I. Geddes, Otmar Biebel, R. Lahmann, D. C. Imrie, M. Palazzo, E. A. Mckigney, I. J. Bloodworth, G. P. Siroli, Michael Hildreth, J. King, A. Gaidot, N. L. Rodning, Hans-Christian Schultz-Coulon, Randall Sobie, R. W. Springer, W. P. Lai, B. Poli, Michael Schulz, S. Braibant, Gabriella Pasztor, Gunter Wolf, G. A. Snow, C. P. Ward, D. Axen, A. Jawahery, S. Söldner-Rembold, Gideon Bella, R. Kowalewski, T. Wlodek, M. Sproston, Yoram Rozen, M. Foucher, Peter Sherwood, Junichi Kanzaki, C. H. Shepherd-Themistocleous, D. Karlen, C. Burgard, Alexander Wagner, J. Ludwig, K. Runge, J. M. Roney, H. J. Burckhart, Jacqueline Batley, H. M. Fischer, A. Michelini, P. Bock, J. Letts, K. Stephens, Reda Tafirout, T. Hilse, Norbert Wermes, Sherry Towers, T. Kawamoto, C. Darling, T. J. Smith, S. A. Robins, T. Omori, N. Tesch, P. Gagnon, S. Orito, M. Rosvick, Georges Azuelos, S. Wotton, J. Allison, G. D. Lafferty, P. Mättig, Shoji Asai, E. Tsur, Guenter Duckeck, M. Hapke, O. Runolfsson, A. Sittler, A. Joly, C. M. Hawkes, M. Verzocchi, J. R. Carter, H. M. Bosch, K. W. Bell, M. J. Oreglia, A. I. McNab, J. Lauber, J. Goldberg, S. M. Gascon-Shotkin, R. Bartoldus, H. O. Ogren, Madjid Boutemeur, N. K. Watson, Christoph Geich-Gimbel, J. C. Hill, Misao Sasaki, G. N. Patrick, B. Nellen, F. Strumia, Claudio Grandi, W. J. McDonald, B. C. Shen, A. S. Turcot, K. Ametewee, Matthew Evans, A. M. Rossi, P. G. Estabrooks, F. X. Gentit, Siegfried Bethke, C. Y. Chang, A. K. Honma, W. G. Scott, H. G. Evans, J. E. Conboy, A. Fürtjes, M. J. Goodrick, W. Mohr, I. Cohen, C. Hartmann, D. E. Plane, Stephen Hillier, A. Posthaus, P. M. Watkins, D. J. Miller, Gideon Alexander, G. M. Dallavalle, F. S. Merritt, T. R. Wyatt, Paolo Capiluppi, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, S. B. Anderson, Koji Yoshimura, R. J. Barlow, Alan Watson, P. Szymanski, Stefan Kluth, P. Taras, Shlomit Tarem, M. Fierro, J. E.G. Edwards, Ekg Sarkisyan, D. L. Rees, Michael Kobel, P. W. Jeffreys, F. Scharf, German Martinez, W. R. Gibson, J. Bechtluft, B. T. Bouwens, M. F. Turner-Watson, J. A. McKenna, A. D. Schaile, M. Morii, Stan Bentvelsen, R. G. Kellogg, D. Chrisman, Peter R Hobson, Volker Blobel, Csaba Hajdu, J. J. Ward, P. Vikas, Lorne Levinson, Julie Kirk, Stefano Marcellini, D. Lanske, Gilles Beaudoin, A. Skillman, J. W. Gery, Stephen Lloyd, Robert M Brown, D. R. Ward, B. Stockhausen, Paul Kyberd, P. Routenburg, F. K. Loebinger, T. Kress, J. Steuerer, Ehud Duchovni, Joleen Pater, Sachio Komamiya, M. Jimack, Theodoros Geralis, E. Ros, R. Giacomelli, S. W. Gensler, T. Kobayashi, S. W. O'Neale, K. J. Anderson, P. Poffenberger, T. P. Kokott, A. Luig, P. Schütz, P. S. Wells, Gregor Herten, J. E. Bloomer, B. Wilkens, Frank Fiedler, Paolo Giacomelli, J. E. Pilcher, M. Hansroul, M. R. Ingram, D. M. Strom, H. Fukui, R. Rylko, O. Schaile, M. Starks, James Pinfold, G. W. Wilson, M. Hauschild, D. G. Fong, C. Lewis, C. Markus, G. T. Jones, J. Gascon, E. H. Vokurka, Richard Keeler, R. J. Homer, R. Howard, J. S. White, J. P. Pansart, A. Malik, Mathieu Doucet, D. S. Koetke, Marcello Mannelli, C. Sbarra, R. D. Heuer, P. Scharff-Hansen, Fabrizio Fabbri, Achim Stahl, G. Yekutieli, A. M. Smith, A. A. Carter, G. Vasseur, P. E.L. Clarke, B. Lorazo, M. K. Jones, J. P. Martin, Ron Folman, Roger Jones, R. Van Kooten, M. Tscheulin, Andris Skuja, S. Petzold, G. D. Long, S. De Jong, Tetsuro Mashimo, P. Utzat, D. E. Hutchcroft, C. Dallapiccola, H. Przysiezniak, M. G. Rison, A. N. Bell, U. Müller, T. J. McMahon, W. Gorn, J. Schwiening, R. K. Carnegie, A. J. Martin, J. A. Wilson, A. Rooke, J. G. Layter, C.J. Beeston, B. Schmitt, N. Altekamp, C. Charlesworth, O. C. Cooke, Stefania Xella, J. von Krogh, G. G. Hanson, C. K. Hargrove, F. Wäckerle, R. J. Hawkings, Matthias Schröder, M. Thiergen, H. Lafoux, L. A. del Pozo, P. Schenk, M. S. Dixit, Frans Meijers, D. M. Gingrich, Tara Shears, P. A. Hart, B. Nijjhar, M. J. Pearce, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Berlich, P. Jovanovic, Austin Ball, Peter Krieger, D. R. Rust, S. L. Chu, Manuella Vincter, Alessandro Montanari, A. M. Lee, U. Jost, R. Mir, M. Tecchio, E. von Törne, H. Takeda, F. G. Oakham, E. L. Barberio, T. Behnke, Eilam Gross, M. Gruwé, Richard Nisius, and Marco Cuffiani

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Monte Carlo method, High Energy Physics::Experiment, Fermion, High multiplicity, Atomic physics, Resonance (particle physics), Particle Physics - Experiment, Lepton, Standard Model
Abstract

A search for l + l − q q (l = e, μ) four-fermion final states in high multiplicity events has been performed at s ≈m Z and above the Z peak at s =130 GeV and s =136 GeV. The data taken with OPAL correspond to an integrated luminosity of 132.4 pb−1 and 5.3 pb−1 at s ≈m Z and s =130−136 GeV, respectively. While at the Z resonance the data are in good agreement with the Standard Model predictions, we find more events than expected at s =130−136 GeV, especially in the μ + μ − q q channel, where 5 events remain after all cuts, with only 0.6 predicted by the Monte Carlo simulation. For all center-of-mass energies the observed shapes of the differential distributions are consistent with the predictions.

131. SEARCH FOR NEUTRAL HIGGS BOSONS IN THE MINIMAL SUPERSYMMETRIC EXTENSION OF THE STANDARD MODEL

Author

Antonio Rossi, P. Bright-Thomas, J. J. Ward, T. Hilse, O. Runolfsson, C. Beeston, H. Przysiezniak, S. G. Clowes, M. Fierro, Claudio Grandi, S. L. Chu, Andris Skuja, Claire Shepherd-Themistocleous, G. D. Long, Tetsuro Mashimo, O. Ganel, P. Igo-Kemenes, G. Beaudoin, W. Gorn, H. Jeremie, R. E. Hughes-Jones, U. Maur, R. Mir, J. Steuerer, R. Lahmann, A. Höcker, P. Scharff-Hansen, B. Stockhausen, Paul Kyberd, F. K. Loebinger, D. C. Imrie, Shlomo Dado, J. Lauber, E. do Couto e Silva, A. M. Smith, H. Takeda, J. King, G. Vasseur, B. Lorazo, F. G. Oakham, Christoph Schwick, H. Mes, E. L. Barberio, Otmar Biebel, James Pinfold, I. P. Duerdoth, Marco Cuffiani, D. G. Charlton, D. L. Wagner, D. G. Fong, Giora Mikenberg, J. Gascon, H. von der Schmitt, Tohru Takeshita, Kiyotomo Kawagoe, H. Deng, R. Humbert, P. Gagnon, Richard G Kellogg, D. Rigby, R. J. Hemingway, Tara Shears, Georges Azuelos, S. Braibant, J. W. Gary, R. Giacomelli, Madjid Boutemeur, Marcello Mannelli, J. E. Duboscq, R. Ströhmer, Barry King, H. M. Fischer, P. Le Du, B. Fabbro, B. W. Kennedy, P. Weber, P. A. Hart, Norbert Wermes, Sherry Towers, P. S. Wells, G. Giacomelli, P. Jovanovic, G. T. Zorn, Austin Ball, T. Kawamoto, Gideon Bella, A. Michelini, P. G. Estabrooks, S. Orito, J. C. Hill, H. J. Burckhart, Jacqueline Batley, Terry Richard Wyatt, Peter Krieger, M. J. Pearce, Misao Sasaki, G. A. Snow, C. P. Ward, M. Rosvick, D. L. Rees, E. Lefebvre, B. C. Shen, H. M. Bosch, Wolfram Dietrich Zeuner, Manuella Vincter, Alessandro Montanari, M. Coupland, F. Odorici, Siegfried Bethke, P. M. Watkins, A. K. Honma, B. Nijjhar, J. Hart, C. Dallapiccola, N. K. Watson, S. A. Robins, W. G. Scott, T. Kobayashi, Xinchou Lou, J. D. Gillies, M. J. Oreglia, R. Kowalewski, John Allison, D. Axen, Richard Keeler, R. Bartoldus, A. Astbury, Silvia Arcelli, Gunter Wolf, F. X. Gentit, H. O. Ogren, M. Fanti, U. Müller, Peter Sherwood, R. Howard, M. J. Losty, A. J. Martin, Gaetano-Marco Dallavalle, J. R. Carter, G. N. Patrick, R. J. Barlow, D. J. Miller, R. W. Springer, Alexander Wagner, R.J. Akers, Ken W Bell, Claude Leroy, Christoph Geich-Gimbel, J. Hagemann, J. Ludwig, Stephen Lloyd, K. Runge, P. Bock, M. Tecchio, Robert M Brown, S. Wotton, N. I. Geddes, Gian Piero Siroli, R. D. Heuer, Fabrizio Fabbri, Ehud Duchovni, D. Van den plas, C. K. Hargrove, A. Buijs, D. M. Strom, Matthias Schröder, C. Stegmann, J. M. Roney, P. Szymanski, B. Poli, H. Fukui, D. R. Rust, W. Mohr, D. A. Hinshaw, O. Schaile, J. Goldberg, B. Nellen, A. Jawahery, D. E. Plane, P. Leblanc, P. Bentkowski, M. Jimack, H. Ihssen, D. S. Koetke, A. M. Lee, A. Posthaus, Stefano Marcellini, H. G. Evans, M. J. Goodrick, C. Jui, I. Cohen, S. W. Gensler, S. J. Hillier, Stan Bentvelsen, Erez Etzion, James Letts, Stefan Kluth, Shlomit Tarem, P. A. Elcombe, R. Van Kooten, D. Pitman, S. Rossberg, Alan Watson, C. J. Oram, J. E. Conboy, A. Fürtjes, M. H. Lehto, R. P. Middleton, T. Behnke, D. M. Gingrich, P. Berlich, Z. Li, W. R. Gibson, Gregor Herten, A. Beck, E. Heflin, B. Wilkens, J. Mildenberger, Harold Nguyen, Lorne Levinson, V. H. Winterer, I. J. Bloodworth, P. D. Phillips, Gordon H. Hanson, J. P. Pansart, F. S. Merritt, J. Becker, J. E. Pilcher, M. Settles, M. F. Turner-Watson, F. Scharf, M. Morii, Peter R Hobson, Yoram Rozen, Hans-Christian Schultz-Coulon, M. Hauschild, Randall Sobie, E. Torrente, Michael Schulz, G. D. Lafferty, C. Markus, M. Foucher, A. D. Schaile, Gideon Alexander, P. Routenburg, T. W. Pritchard, M. W. Redmond, Paolo Capiluppi, G. W. Wilson, Sachio Komamiya, D. Karlen, Theodoros Geralis, E. Ros, A. Skillman, Guenter Duckeck, M. A. Thomson, C. Burgard, E. K. U. Gross, J. A. McKenna, T. Wlodek, T. P. Kokott, A. Luig, M. Sproston, C. Darling, T. J. Smith, T. Tsukamoto, P. Mättig, Shoji Asai, N. Tesch, C. M. Hawkes, Daniel Lellouch, Takehiko Mori, J. R. McNab, A. Yeaman, P. D. Grannis, D. Hochman, K. Stephens, J. R. McNutt, V. Gibson, D. R. Ward, J. C. Clayton, Paolo Giacomelli, M. Hansroul, P. E.L. Clarke, R. J. Homer, U. C. Dunwoody, M. K. Jones, J. P. Martin, S. De Jong, C. Moisan, G. A. Beck, Achim Stahl, P. Teixeira-Dias, F. Liu, B. Schmitt, S. W. O'Neale, K. J. Anderson, P. Schenk, J. von Krogh, Margret Fincke-Keeler, C. Y. Chang, Dave Robinson, M. S. Dixit, Frans Meijers, T. J. McMahon, Michael Kobel, J. Schwiening, R. K. Carnegie, J. A. Wilson, H. Lafoux, J. G. Layter, C. Charlesworth, P. Poffenberger, C. Sbarra, Peter Fischer, P. Schütz, P. Pfister, Michael Dittmar, G. Yekutieli, A. Gaidot, A. A. Carter, Ron Folman, Roger Jones, M. G. Rison, M. Yurko, and P. W. Jeffreys

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Elementary particle, Context (language use), Parameter space, Standard Model, symbols.namesake, symbols, Higgs boson, High Energy Physics::Experiment, Quantum field theory, Engineering (miscellaneous), Higgs mechanism, Particle Physics - Experiment, Boson
Abstract

A search for the neutral Higgs bosons h0 and A0, predicted by the Minimal Supersymmetric Extension of the Standard Model (MSSM), has been performed by the OPAL Collaboration at LEP. The analysis was based on approximately 75 pb−1 of data taken at centre-of-mass energies in the vicinity of the Z0 resonance. No Higgs boson signals have been detected. Using, in addition, an upper limit on the contribution of non-Standard Model processes to the Z0 boson width, almost the entire MSSM parameter space that can be reached at present LEP energies has been excluded. In particular, at the 95% confidence level, our results imply that\(m_{h^0 } > 44.5\) GeV/c2 and\(m_{A^0 } > 24.3\) GeV/c2, for tan β≥1. The sensitivity to this assumption is discussed and the search results are also interpreted in the context of general two-doublet models.

132. MEASUREMENT OF THE LONGITUDINAL, TRANSVERSE AND ASYMMETRY FRAGMENTATION FUNCTIONS AT LEP

Author

D. R. Ward, T. Kress, Frank Fiedler, D. Hochman, R. Van Kooten, J. C. Clayton, Tara Shears, R. Bartoldus, R. Mir, J. Steuerer, U. C. Dunwoody, W. Matthews, Otmar Biebel, P. A. Hart, D. L. Wagner, B. Nijjhar, M. J. Pearce, I. J. Bloodworth, C.J. Beeston, M. A. Thomson, A. Gaidot, Gideon Bella, E. Lefebvre, T. Wlodek, B. Stockhausen, Paul Kyberd, F. K. Loebinger, S. W. O'Neale, J. Lauber, K. J. Anderson, H. Deng, Margret Fincke-Keeler, F. Wäckerle, M. Sproston, W. R. Gibson, F. Odorici, H. O. Ogren, Christoph Geich-Gimbel, D. Axen, H. J. Burckhart, R. W. Springer, Eilam Gross, Andris Skuja, A. I. McNab, J. Goldberg, D. M. Gingrich, R. Lahmann, N. J. Oldershaw, C. Sbarra, R.J. Akers, M. Settles, P. Poffenberger, Yoram Rozen, J. Letts, F. G. Oakham, Jacqueline Batley, D. C. Imrie, T. Tsukamoto, P. Igo-Kemenes, N. Tesch, R. Giacomelli, Matthias Schröder, Norbert Wermes, Sherry Towers, P. Schütz, E. L. Barberio, T. Kawamoto, B. Nellen, M. Foucher, P. Berlich, A. Buijs, D. M. Strom, C. Stegmann, G. D. Long, A. Beck, F. X. Gentit, H. Jeremie, T. Hilse, R. E. Hughes-Jones, A. Jawahery, O. Schaile, J. E. Conboy, Peter Sherwood, Sachio Komamiya, D. E. Hutchcroft, A. Fürtjes, Theodoros Geralis, E. Ros, S. Orito, D. R. Rust, Tetsuro Mashimo, K. Ametewee, H. Mes, M. Rosvick, C. Dallapiccola, Junichi Kanzaki, Georges Azuelos, C. Y. Chang, O. Runolfsson, P. Fath, Alexander Wagner, G. P. Siroli, J. D. Gillies, M. Hapke, Gideon Alexander, J. Ludwig, J. King, H. Fukui, Marco Cuffiani, D. Karlen, Paolo Capiluppi, C. Burgard, P. Taras, Lorne Levinson, V. Gibson, M. Starks, K. W. Bell, Michael Kobel, T. P. Kokott, A. J. Martin, A. M. Lee, N. Altekamp, F. S. Merritt, K. Runge, A. Luig, U. Müller, P. Bock, M. J. Oreglia, P. D. Phillips, E. von Törne, G. Yekutieli, E. do Couto e Silva, J. C. Hill, Julie Kirk, Misao Sasaki, H. Lafoux, N. I. Geddes, B. C. Shen, S. L. Chu, D. J. Miller, J. Bechtluft, C. Darling, T. J. Smith, Claudio Grandi, Siegfried Bethke, A. K. Honma, Dave Charlton, W. G. Scott, J. A. McKenna, W. Gorn, R. G. Kellogg, H. G. Evans, P. Mättig, R. Bürgin, B. Fabbro, Gilles Beaudoin, Paolo Giacomelli, M. Hansroul, Shoji Asai, M. Fanti, G. N. Patrick, G. Giacomelli, D. Rigby, R. J. Hemingway, C. M. Hawkes, Daniel Lellouch, R. Kowalewski, B. W. Kennedy, Stefano Marcellini, P. S. Wells, P. Jovanovic, Stephen Lloyd, Takehiko Mori, A. Skillman, N. L. Rodning, M. Tecchio, Robert M Brown, M. J. Losty, Sven Menke, C. K. Hargrove, M. J. Goodrick, V. Zacek, Ehud Duchovni, R. D. Heuer, B. Poli, C. H. Shepherd-Themistocleous, Fabrizio Fabbri, M. Jimack, I. Cohen, F. Palmonari, R. J. Homer, Gregor Herten, S. W. Gensler, C. Hartmann, D. E. Plane, T. Behnke, S. J. Hillier, P. Scharff-Hansen, T. R. Wyatt, Richard Keeler, H. M. Fischer, A. Joly, Kiyotomo Kawagoe, G. M. Dallavalle, B. Wilkens, A. Michelini, A. A. Carter, Ron Folman, R. J. Barlow, M. W. Redmond, P. Gagnon, G. A. Beck, Achim Stahl, P. Teixeira-Dias, R. Howard, I. P. Ducrdoth, J. Allison, J. P. Pansart, S. G. Clowes, A. M. Smith, Roger Jones, M. F. Turner-Watson, M. Morii, G. T. Zorn, M. Fierro, J. E.G. Edwards, G. Vasseur, Stefan Kluth, S. A. Robins, Alan Watson, H. M. Bosch, B. Lorazo, Shlomit Tarem, P. W. Jeffreys, Wolfram Dietrich Zeuner, Peter R Hobson, C. J. Oram, J. E. Pilcher, B. Schmitt, James Pinfold, D. G. Fong, P. Routenburg, J. Gascon, P. Bright-Thomas, J. R. Carter, A. Malik, J. W. Gary, D. S. Koetke, Marcello Mannelli, J. E. Duboscq, Gunter Wolf, P. Weber, J. J. Ward, P. Vikas, G. W. Wilson, M. Hauschild, Reda Tafirout, D. Lanske, S. Wotton, Shlomo Dado, C. Markus, B. J. King, Giora Mikenberg, P. Utzat, A. M. Rossi, S. Braibant, M. G. Rison, T. Kobayashi, O. C. Cooke, G. A. Snow, C. P. Ward, S. Söldner-Rembold, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, T. W. Pritchard, Guenter Duckeck, J. von Krogh, S. B. Anderson, P. Szymanski, Stan Bentvelsen, R. J. Hawkings, L. A. del Pozo, T. J. McMahon, A. S. Turcot, J. Schwiening, R. K. Carnegie, J. A. Wilson, Madjid Boutemeur, P. G. Estabrooks, P. M. Watkins, Silvia Arcelli, E. A. Mckigney, W. P. Lai, Austin Ball, J. M. Roney, Peter Krieger, G. D. Lafferty, Manuella Vincter, Alessandro Montanari, P. E.L. Clarke, M. K. Jones, J. P. Martin, M. Tscheulin, S. De Jong, N. K. Watson, H. Przysiezniak, W. Mohr, A. Posthaus, G. G. Hanson, P. Schenk, D. L. Rees, M. S. Dixit, Frans Meijers, F. Scharf, J. G. Layter, A. D. Schaile, C. Charlesworth, and K. Stephens

Subjects
Physics, Quantum chromodynamics, Particle physics, Physics and Astronomy (miscellaneous), media_common.quotation_subject, High Energy Physics::Phenomenology, Hadron, Fragmentation (computing), Elementary particle, Multiplicity (mathematics), Asymmetry, Charged particle, Gluon, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment, media_common
Abstract

The fragmentation function for the process e+e−→h+X, whereh represents a hadron, may be decomposed into transverse, longitudinal and asymmetric contributions by analysis of the distribution of polar production angles. A number of new tests of QCD have been proposed using these fragmentation functions, but so far no data have been published on the separate components. We have performed such a separation using data on charged particles from hadronic Z0 decays atOpal, and have compared the results with the predictions of QCD. By integrating the fragmentation functions, we determine the average charged particle multiplicity to be\(\overline {n_{ch} } = 21.05 \pm 0.20\). The longitudinal to total cross-section ratio is determined to be σL/σtot=0.057±0.005. From the longitudinal fragmentation function we are able to extract the gluon fragmentation function. The connection between the asymmetry fragmentation function and electroweak asymmetrics is discussed.

133. A STUDY OF DIFFERENCES BETWEEN QUARK AND GLUON JETS USING VERTEX TAGGING OF QUARK JETS

Author

Paul Kyberd, F. K. Loebinger, M. W. Redmond, A. Rollnik, R. Giacomelli, M. Jimack, John Allison, Sachio Komamiya, R. G. Kellogg, D. S. Koetke, Stefano Marcellini, J. Mildenberger, Harold Nguyen, Gordon H. Hanson, James Letts, G. Beaudoin, A. Astbury, Andris Skuja, H. M. Fischer, E. Ros, Margret Fincke-Keeler, P. Singh, R. Lahmann, R. Mir, M. Yurko, P. E.L. Clarke, O. Ganel, J. Steuerer, S. Schreiber, A. J. Martin, H. Mes, D. C. Imrie, A. Michelini, A. C. Janissen, Tetsuro Mashimo, P. W. Jeffreys, F. C. Grant, T. J. McMahon, I. P. Duerdoth, P. Igo-Kemenes, G. Maringer, Shlomo Dado, J. N. Tresilian, M. A. Whalley, T. P. Kokott, Carla Sbarra, A. M. Lee, J. Schwiening, R. K. Carnegie, H. Jeremie, P. G. Estabrooks, P. A. Elcombe, R. W. L. Jones, J. A. Wilson, S. Barnett, D. Hochman, N. J. Thackray, J. P. Martin, P. Bright-Thomas, R. E. Hughes-Jones, U. Maur, X. C. Lou, C. K. Hargrove, A. Buijs, D. M. Strom, P. Pfister, G. P. Siroli, W. Gorn, Tara Shears, M. Sasaki, S. De Jong, D. R. Rust, G. A. Bahan, Christoph Schwick, Giora Mikenberg, R. J. Hemingway, I. J. Bloodworth, B. Panzer-Steindel, Tatsuo Kawamoto, J. Becker, J. Hart, W. Schappert, D. E. Plane, J. C. Clayton, G. Duckeck, R. Ströhmer, M. J. Oreglia, P. M. Watkins, C. Wahl, C. Y. Chang, P. F. Harrison, G. Giacomelli, Tohru Takeshita, H. H. Bosch, Horst Breuker, E. do Couto e Silva, P. D. Acton, G. M. Dallavalle, M. Jobes, U. Binder, Stephen Lloyd, Gideon Bella, J. E. Pilcher, M. Tecchio, R. Yaari, J. D. Gillies, S. Bethke, T. Hilse, F. Odorici, P. Bentkowski, H. J. Burckhart, T. Mouthuy, M. Settles, J. R. Carter, G. N. Patrick, O. Runolfsson, E. Helfin, P. Scharff-Hansen, Georges Azuelos, Phillip Allport, J. von Krogh, A. Simon, Wolfram Dietrich Zeuner, Marco Cuffiani, Otmar Biebel, G. E. Richards, Silvia Arcelli, A. Yeaman, M. A. Thomson, D. G. Charlton, D. L. Wagner, C. Jui, M. Foucher, H. Deng, R. Humbert, G. W. Wilson, J. W. Gary, Claudio Grandi, A. M. Smith, G. Vasseur, B. Lorazo, Norbert Wermes, James Pinfold, D. G. Fong, P. Schenk, J. Gascon, J. F. Kral, G. T. Zorn, K. W. Bell, N. I. Geddes, Max Weber, J. C. Hill, A. M. Rossi, T. Tsukamoto, B. C. Shen, S. Levegrün, A. K. Honma, W. G. Scott, N. K. Watson, D. A. Hinshaw, Dave Robinson, L. A. del Pozo, D. J. Miller, S. W. O'Neale, K. J. Anderson, A. Gaidot, M. Kuwano, T. Wlodek, M. F. Turner, M. Sproston, S. L. Chu, C. Moisan, J. P. Walker, G. A. Beck, P. Teixeira-Dias, John Hobbs, Alan Watson, D. J.P. Dumas, P. S. Wells, Terry Richard Wyatt, M. Coupland, O. Schaile, D. Karlen, C. Burgard, N. Paz-Jaoshvili, Gideon Alexander, Paolo Capiluppi, P. Taras, Mitsuaki Nozaki, G. A. Snow, C. P. Ward, D. L. Rees, H. von der Schmitt, B. W. Kennedy, R. Kowalewski, K. Stephens, J. R. McNutt, B. Schmitt, S. Orito, M. Rosvick, Marcello Mannelli, J. E. Duboscq, Ehud Duchovni, Richard Keeler, W. J. Collins, P. M. Hattersley, R. Shypit, J. M. Roney, Michael Dittmar, G. Yekutieli, H. Przysiezniak, P. Routenburg, N. Tesch, A. Dieckmann, M. S. Dixit, M. Fierro, M. Hansroul, H. Ihssen, Frans Meijers, Randall Sobie, G. D. Lafferty, V. Gibson, G. Quast, John Baines, C. H. Shepherd-Themistocleous, P. Poffenberger, Claude Leroy, J. P. Pansart, R. J. Homer, S. W. Gensler, J. G. Layter, F. G. Oakham, T. J. Smith, S. J. Hillier, T. Kobayashi, M. Hauschild, D. R. Ward, T. W. Pritchard, T. Behnke, A. A. Carter, G. Transtromer, R. Van Kooten, C. J. Virtue, F. Lamarche, B. Boden, P. Mättig, B. Poli, C. M. Hawkes, M. Cooper, M. Morii, C. Markus, Peter R Hobson, Daniel Lellouch, P. Paschievici, P. Jovanovic, Austin Ball, D. Menszner, Takehiko Mori, Kiyotomo Kawagoe, Alessandro Montanari, D. Axen, A. D. Schaile, J. R. Batley, P. Weber, J. M. Lorah, A. Jawahery, W. Mohr, G. Tysarczyk-Niemeyer, W. R. Gibson, J. Banks, Peter Sherwood, V. H. Winterer, Erez Etzion, A. Beck, R. D. Heuer, Fabrizio Fabbri, R. M. Brown, Lorne Levinson, R. W. Springer, Alexander Wagner, D. Van den plas, J. Hagemann, J. Ludwig, G. J. Van Dalen, K. Runge, P. Bock, D. Pitman, E. Torrente-Lujan, Roger Barlow, Stefan Kluth, M. H. Lehto, Shlomit Tarem, P. Berlich, L. Köpke, S. Rossberg, C. J. Oram, R. P. Middleton, J. Goldberg, B. Nellen, P. Leblanc, H. G. Evans, M. J. Goodrick, I. Cohen, H. O. Ogren, Christoph Geich-Gimbel, J. E. Conboy, J. Kroll, F. X. Gentit, A. Pouladdej, M. J. Losty, F. S. Merritt, S. Wotton, J. A. McKenna, and R. F. McGowan

Subjects
Quark, Physics, Particle physics, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Lattice, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, Monte Carlo method, Perturbative QCD, Vertex (geometry), Gluon, Hadronization, Nuclear physics, High Energy Physics::Experiment, Multiplicity (chemistry), Engineering (miscellaneous), Particle Physics - Experiment
Abstract

Quark and gluon jets with equal energies are identified in three-jet hadronicZ0 events, using reconstructed secondary vertices from heavy quark decay in conjunction with energy ordering of the jets to anti-tag the gluon jets. Selection of jets from a symmetric event topology allows their properties to be compared in a simple and direct manner. The jets under study have an energy of about 24 GeV. It is observed that gluon jets have a larger angular width than quark jets and yield a softer particle energy spectrum. Correspondingly, the mean particle multiplicity is found to be larger for gluon than for quark jets. Correcting the distributions for residual misidentification of the quark and gluon jets, the ratio of mean particle multiplicty of gluon relative to quark jets is measured to be $$\frac{{\left\langle n \right\rangle _{gluon} }}{{\left\langle n \right\rangle _{quark} }} = 1.27 \pm 0.04(stat.) \pm 0.06(syst.),$$ where the jets are defined using thek⊥ jet finder. The numerical value of this ratio is found to be sensitive to the choice of the jet algorithm. The experimental results are compared to Monte Carlo calculations which incorporate perturbative QCD along with different assumptions about the hadronization process.

134. A STUDY OF B-MESON OSCILLATIONS USING DILEPTON EVENTS

Author

G. A. Beck, Achim Stahl, Tara Shears, P. Teixeira-Dias, P. A. Hart, C. M. Hawkes, Daniel Lellouch, B. Schmitt, S. G. Clowes, Takehiko Mori, M. Fierro, J. E.G. Edwards, M. J. Pearce, A. Buijs, V. Zacek, D. M. Strom, C. Stegmann, H. Fukui, D. Hochman, H. M. Fischer, James Pinfold, K. Stephens, B. Stockhausen, Paul Kyberd, F. K. Loebinger, T. Hilse, O. Runolfsson, A. Michelini, Margret Fincke-Keeler, C. Beeston, R. Van Kooten, Claudio Grandi, F. S. Merritt, D. G. Fong, Gregor Herten, B. Wilkens, Ehud Duchovni, P. S. Wells, J. P. Pansart, J. E. Pilcher, V. Gibson, J. Gascon, Kiyotomo Kawagoe, Terry Richard Wyatt, R. Giacomelli, D. Axen, I. J. Bloodworth, M. Jimack, M. Yurko, H. Mes, P. W. Jeffreys, G. W. Wilson, A. S. Turcot, M. Hauschild, Peter Sherwood, P. Igo-Kemenes, N. J. Oldershaw, Alexander Wagner, F. Palmonari, R.J. Akers, C. Markus, H. Jeremie, O. Schaile, M. Settles, Yoram Rozen, M. Starks, A. J. Martin, John Allison, J. Hagemann, J. Ludwig, Otmar Biebel, I. P. Duerdoth, D. R. Ward, P. Fath, T. Kress, M. Foucher, O. Tousignant, K. Runge, P. Bock, S. W. Gensler, Madjid Boutemeur, J. W. Gary, D. S. Koetke, R. E. Hughes-Jones, U. Maur, S. J. Hillier, Gideon Bella, Marcello Mannelli, J. E. Duboscq, J. A. McKenna, P. Bright-Thomas, D. L. Wagner, P. Gagnon, J. J. Ward, P. Vikas, Gunter Wolf, F. X. Gentit, S. A. Robins, Andris Skuja, Junichi Kanzaki, S. L. Chu, E. do Couto e Silva, H. J. Burckhart, Jacqueline Batley, D. Karlen, C. Burgard, V. H. Winterer, S. W. O'Neale, H. Deng, R. G. Kellogg, P. Weber, P. G. Estabrooks, K. J. Anderson, G. D. Long, D. M. Gingrich, J. C. Clayton, G. T. Zorn, Tetsuro Mashimo, U. Müller, R. Bartoldus, Richard Keeler, S. Braibant, H. M. Bosch, Stefano Marcellini, Wolfram Dietrich Zeuner, C. Darling, T. J. Smith, J. Letts, P. Berlich, H. O. Ogren, Christoph Geich-Gimbel, O. C. Cooke, S. Wotton, M. Fanti, Norbert Wermes, Sherry Towers, P. M. Watkins, P. Mättig, Shoji Asai, W. Gorn, C. Y. Chang, T. Kawamoto, R. Howard, Paolo Giacomelli, Claude Leroy, M. Hansroul, G. A. Snow, C. P. Ward, P. Taras, S. Orito, Stephen Lloyd, C. K. Hargrove, Matthias Schröder, Michael Kobel, Xinchou Lou, M. Tecchio, Robert M Brown, D. L. Rees, G. M. Dallavalle, J. E. Conboy, M. Rosvick, A. Fürtjes, S. Söldner-Rembold, E. Lefebvre, Silvia Arcelli, R. W. Springer, R. D. Heuer, Julie Kirk, T. Behnke, P. Scharff-Hansen, R. Lahmann, Fabrizio Fabbri, C. H. Shepherd-Themistocleous, D. C. Imrie, Erez Etzion, H. Lafoux, F. Odorici, M. W. Redmond, Tohru Takeshita, J. Steuerer, Stefan Kluth, Eilam Gross, Shlomit Tarem, D. E. Planc, Hans-Christian Schultz-Coulon, D. R. Rust, Randall Sobie, Michael Schulz, G. D. Lafferty, P. Poffenberger, R. J. Homer, Peter Fischer, N. Capdevielle, Shlomo Dado, J. von Krogh, Alan Watson, C. J. Oram, A. M. Smith, K. Ametewee, Dave Charlton, P. Schütz, Georges Azuelos, M. J. Oreglia, W. P. Lai, Gideon Alexander, G. Vasseur, Paolo Capiluppi, R. Bürgin, B. Fabbro, Barry King, B. Lorazo, T. W. Pritchard, A. M. Lee, A. Gaidot, W. R. Gibson, K. W. Bell, J. M. Roney, A. M. Rossi, R. P. Middleton, G. P. Siroli, J. King, G. Giacomelli, J. C. Hill, A. I. McNab, J. Goldberg, Marco Cuffiani, J. R. Carter, Misao Sasaki, B. Nellen, G. N. Patrick, Christoph Schwick, A. Beck, Giora Mikenberg, B. C. Shen, A. Jawahery, P. Leblanc, Guenter Duckeck, E. Heflin, Siegfried Bethke, A. K. Honma, Dave Robinson, B. Nijjhar, W. G. Scott, N. I. Geddes, Lorne Levinson, R. Kowalewski, P. D. Phillips, H. G. Evans, M. J. Goodrick, I. Cohen, Gilles Beaudoin, N. L. Rodning, M. J. Losty, A. Skillman, B. Poli, P. Szymanski, L. A. del Pozo, Reda Tafirout, C. Sbarra, C. Jui, Stan Bentvelsen, Michael Dittmar, G. Yekutieli, T. Kobayashi, A. A. Carter, Ron Folman, Roger Jones, P. Utzat, M. G. Rison, T. J. McMahon, J. Schwiening, R. K. Carnegie, J. A. Wilson, P. A. Elcombe, F. Scharf, A. D. Schaile, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, N. K. Watson, Austin Ball, Peter Krieger, W. Mohr, A. Posthaus, W. Matthews, Manuella Vincter, Alessandro Montanari, M. A. Thomson, T. Wlodek, M. Sproston, T. Tsukamoto, R. Mir, N. Tesch, J. Lauber, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, J. P. Martin, H. Takeda, M. Tscheulin, F. G. Oakham, S. De Jong, E. L. Barberio, A. Yeaman, C. Dallapiccola, J. D. Gillies, H. Przysiezniak, M. F. Turner-Watson, M. Morii, Peter R Hobson, P. Routenburg, R. J. Barlow, Sachio Komamiya, Theodoros Geralis, E. Ros, D. J. Miller, T. P. Kokott, A. Luig, J. G. Layter, C. Charlesworth, G. G. Hanson, P. Schenk, M. S. Dixit, and Frans Meijers

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Lower limit, Momentum, Nuclear physics, High Energy Physics::Experiment, B meson, Engineering (miscellaneous), Particle Physics - Experiment, Eigenvalues and eigenvectors, Lepton
Abstract

The time dependence of B meson oscillations is studied using hadronic Z0 decays with identified leptons in both thrust hemispheres. Decay times are reconstructed for each of the semileptonic B decays by forming vertices which include the lepton and by estimating the B meson momentum. The mass difference of the two mass eigenstates in the Bd0 system, Δmd, is measured to be\(0.462_{ - 0.053 - 0.035}^{ + 0.040 + 0.052} ps^{ - 1}\), where the first error is statistical and the second systematic. For the Bs0 system, a lower limit of Δms>2.2 ps−1 at 95% C.L. is derived.

135. Microscopic Monte Carlo, an alternative method for calculating multiple Coulomb scattering

Author

H. Jeremie and B. Lorazo

Subjects
Physics, Hybrid Monte Carlo, Nuclear and High Energy Physics, Quantum Monte Carlo, Monte Carlo method, Dynamic Monte Carlo method, Monte Carlo integration, Monte Carlo method in statistical physics, Kinetic Monte Carlo, Statistical physics, Instrumentation, Monte Carlo molecular modeling
Abstract

A Monte Carlo calculation of multiple Coulomb scattering is presented that traces a particle through a medium following directly the individual scatterings. The method is best suited to applications where a precisely calculated trajectory in a gas-filled device is needed.

Published
1988

136. Precision electroweak measurements on the Z resonance

Author

Schael, S, Barate, R, Bruneliere, R, Buskulic, D, Bonis, De, Decamp, I, Ghez, D, Goy, P, Jezequel, C, Lees, S, Lucotte, Jp, Martin, A, Merle, F, Minard, E, Nief, Mn, Odier, Jy, Pietrzyk, P, Trocme, B, Bravo, B, Casado, S, Chmeissani, Mp, Comas, M, Crespo, P, Fernandez, Jm, E, Fernandez, Bosman, Garrido, M, Grauges, L, Juste, E, Martinez, A, Merino, M, Miquel, G, Mir, R, Orteu, Lm, Pacheco, S, Park, A, Perlas, Ic, Riu, J, Ruiz, I, Sanchez, H, Colaleo, F, Creanza, A, D, Filippis, De, N, Palma, De, Iaselli, M, Maggi, G, Nuzzo, M, Ranieri, S, Raso, A, Ruggieri, G, Selvaggi, F, Silvestris, G, Tempesta, L, Tricomi, P, Zito, A, Huang, G, Lin, X, Ouyang, J, Wang, Q, Xie, T, Xu, Y, Xue, R, Zhang, S, Zhang, J, Zhao, L, Abbaneo, W, Bazarko, D, Becker, A, Boix, U, Bird, G, Blucher, F, Bonvicini, E, B, Bright, Thomas, Barklow, P, Buchmuller, T, Cattaneo, O, Cerutti, M, Ciulli, F, Clerbaux, V, Drevermann, B, Forty, H, Frank, Rw, Greening, M, Hagelberg, Tc, Halley, R, Gianotti, Aw, Girone, F, Hansen, M, Harvey, Jb, Jacobsen, J, Hutchcroft, R, Janot, De, Jost, R, Knobloch, B, Kado, J, Lehraus, M, Lazeyras, I, Maley, P, Mato, R, May, P, Moutussi, J, A, Pepe, Altarelli, Ranjard, M, Rolandi, F, Schlatter, L, Schmitt, D, Schneider, B, Tejessy, O, Teubert, W, Tomalin, F, Tournefier, Ir, Veenhof, E, Valassi, R, Wiedenmann, A, Wright, W, Ajaltouni, Ae, Badaud, Z, Chazelle, F, Deschamps, G, Dessagne, O, Falvard, S, Ferdi, A, Fayolle, C, Gay, D, Guicheney, P, Henrard, C, Jousset, P, Michel, J, Monteil, B, Montret, S, Pallin, Jc, Pascolo, D, Perret, Jm, Podlyski, P, Bertelsen, F, Fernley, H, Hansen, T, Hansen, Jd, Hansen, Jr, Kraan, Ph, Lindahl, Ac, Mollerud, A, Nilsson, R, Rensch, Bs, Waananen, B, Daskalakis, A, Kyriakis, G, Markou, A, Simopoulou, C, Siotis, E, Vayaki, I, Zachariadou, A, Blondel, K, Bonneaud, A, Brient, G, Machefert, Jc, Rouge, E, Rumpf, A, Swynghedauw, M, Tanaka, M, Verderi, R, Videau, M, Focardi, H, Parrini, E, Corden, G, Georgiopoulos, M, Antonelli, C, Antonelli, A, 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Thaler, Fe, Thom, Jj, Trandafir, J, Turk, Ai, Usher, Jd, Vavra, T, Vella, J, Venuti, E, Verdier, Jp, Wagner, R, Waite, Sr, Walston, Ap, Wang, S, Watts, J, Weidemann, Sj, Weiss, Aw, Whitaker, Er, White, Js, Wickens, Sl, Williams, Fj, Williams, Da, Williams, Dc, Willocq, Sh, Wilson, S, Wisniewski, Rj, Wittlin, Wj, Woods, Jl, Word, M, Wright, Gb, Wyss, Tr, Yamamoto, J, Yang, Rk, Yashima, Xq, Yellin, J, Young, Sj, Yuta, Cc, Zapalac, H, Zdarko, G, Zeitlin, Rw, Zhou, C, Blondel, Alain, Schael, S, Barate, R, Bruneliere, R, Spagnolo, Stefania Antonia, S., Schael, Aloisio, Alberto, Alviggi, Mariagrazia, Canale, Vincenzo, Chiefari, Giovanni, DELLA VOLPE, Domenico, Merola, Leonardo, Napolitano, Marco, Patricelli, Sergio, Sciacca, Crisostomo, Lista, Luca, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Astroparticules (LPTA), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF (institution))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), ALEPH, DELPHI, L3, OPAL, SLD, BARBIELLINI AMIDEI, Guido, Bosisio, Luciano, DELLA RICCA, Giuseppe, Giannini, Gianrossano, Gregorio, Anna, Lanceri, Livio, Poropat, Paolo, Vitale, Lorenzo, Buskulic, D, De Bonis, I, Decamp, D, Ghez, P, Goy, C, Jezequel, S, Lees, J, Lucotte, A, Martin, F, Merle, E, Minard, M, Nief, J, Odier, P, Pietrzyk, B, Trocme, B, Bravo, S, Casado, M, Chmeissani, M, Comas, P, Crespo, J, Fernandez, E, Fernandez Bosman, M, Garrido, L, Grauges, E, Juste, A, Martinez, M, Merino, G, Miquel, R, Mir, L, Orteu, S, Pacheco, A, Park, I, Perlas, J, Riu, I, Ruiz, H, Sanchez, F, Colaleo, A, Creanza, D, De Filippis, N, De Palma, M, Iaselli, G, Maggi, G, Maggi, M, Nuzzo, S, Ranieri, A, Raso, G, Ruggieri, F, Selvaggi, G, Silvestris, L, Tempesta, P, Tricomi, A, Zito, G, Huang, X, Lin, J, Ouyang, Q, Wang, T, Xie, Y, Xu, R, Xue, S, Zhang, J, Zhang, L, Zhao, W, Abbaneo, D, Bazarko, A, Becker, U, Boix, G, Bird, F, Blucher, E, Bonvicini, B, Bright Thomas, P, Barklow, T, Buchmuller, O, Cattaneo, M, Cerutti, F, Ciulli, V, Clerbaux, B, Drevermann, H, Forty, R, Frank, M, Greening, T, Hagelberg, R, Halley, A, Gianotti, F, Girone, M, Hansen, J, Harvey, J, Jacobsen, R, Hutchcroft, D, Janot, R, Jost, B, Knobloch, J, Kado, M, Lehraus, I, Lazeyras, P, Maley, R, Mato, P, May, J, Moutussi, A, Pepe Altarelli, M, Ranjard, F, Rolandi, L, Schlatter, D, Schmitt, B, Schneider, O, Tejessy, W, Teubert, F, Tomalin, I, Tournefier, E, Veenhof, R, Valassi, A, Wiedenmann, W, Wright, A, Ajaltouni, Z, Badaud, F, Chazelle, G, Deschamps, O, Dessagne, S, Falvard, A, Ferdi, C, Fayolle, D, Gay, P, Guicheney, C, Henrard, P, Jousset, J, Michel, B, Monteil, S, Montret, J, Pallin, D, Pascolo, J, Perret, P, Podlyski, F, Bertelsen, H, Fernley, T, Hansen, P, Kraan, A, Lindahl, A, Mollerud, R, Nilsson, B, Rensch, B, Waananen, A, Daskalakis, G, Kyriakis, A, Markou, C, Simopoulou, E, Siotis, I, Vayaki, A, Zachariadou, K, Blondel, A, Bonneaud, G, Brient, J, Machefert, E, Rouge, A, Rumpf, M, Swynghedauw, M, Tanaka, R, Verderi, M, Videau, H, Focardi, E, Parrini, G, Corden, M, Georgiopoulos, C, Antonelli, A, Antonelli, M, Bencivenni, G, Bologna, G, Bossi, F, Campana, P, Capon, G, Chiarella, V, Felici, G, Laurelli, P, Mannocchi, G, Murtas, G, Passalacqua, L, Picchi, P, Colrain, P, Ten Have, I, Hughes, I, Kennedy, J, Knowles, I, Lynch, J, Morton, W, Negus, P, O'Shea, V, Raine, C, Reeves, P, Scarr, J, Smith, K, Thompson, A, Turnbull, R, Wasserbaech, S, Cavanaugh, R, Dhamotharan, S, Geweniger, C, Hanke, P, Hansper, G, Hepp, V, Kluge, E, Putzer, A, Sommer, J, Stenzel, H, Tittel, K, Werner, W, Wunsch, M, Beuselinck, R, Binnie, D, Cameron, W, Davies, G, Dornan, P, Goodsir, S, Marinelli, N, Martin, E, Nash, J, Nowell, J, Rutherford, S, Sedgbeer, J, Thompson, J, White, R, Williams, M, Ghete, V, Girtler, P, Kneringer, E, Kuhn, D, Rudolph, G, Bouhova Thacker, E, Bowdery, C, Buck, P, Clarke, D, Ellis, G, Finch, A, Foster, F, Hughes, G, Jones, R, Keemer, N, Pearson, M, Robertson, N, Sloan, T, Smizanska, M, Snow, S, Van Der Aa, O, Delaere, C, Leibenguth, G, Lemaitre, V, Bauerdick, L, Blumenschein, U, Van Gemmeren, P, Giehl, I, Holldorfer, F, Jakobs, K, Kasemann, M, Kayser, F, Kleinknecht, K, Muller, A, Quast, G, Renk, B, Rohne, E, Sander, H, Schmeling, S, Wachsmuth, H, Wanke, R, Zeitnitz, C, Ziegler, T, Aubert, J, Benchouk, C, Bonissent, A, Carr, J, 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Vandalen, Gj, Virtue, Cj, Vokurka, Eh, Vollmer, Cf, Wagner, Dl, Walker, Jp, Ward, Cp, Ward, Dr, Watkins, Pm, Watson, At, Watson, Nk, Whalley, Ma, Wilson, Ja, Wilson, Gw, Winterer, Vh, Wood, Nc, Wyatt, Tr, Zorn, Gt, Allen, Nj, Ash, Ww, Baird, Kg, Band, Hr, Barakat, Mb, Baranko, Gj, Barklow, Tl, Bashindzhagian, Gl, Bauer, Jm, Bazarko, Ao, Benvenuti, Ac, Bilei, Gm, Bower, Gr, Brau, Je, Bugg, Wm, Burnett, Th, Burrows, Pn, Caldwell, Do, Chadwick, Gb, Cohn, Ho, Coller, Ja, Convery, Mr, Cowan, Rf, Coyle, Pa, Coyne, Dg, Damerell, Cj, de Groot, N, de Sangro, R, Dervan, Pj, Dong, Dn, Du, Pyc, Eisenstein, Bi, Fernandez, Jp, Fero, Mj, Friedman, Ji, Garwin, El, Hallewell, Gd, Hart, El, Hitlin, Dg, Huffer, Me, Hughes, Ew, Izen, Jm, Jackson, Dj, Jaros, Ja, Jiang, Zy, Johnson, Jr, Johnson, Ra, Kamyshkov, Ya, Kang, Hj, Kelsey, Mh, Kendall, Hw, Kim, Yd, Krishna, Nm, Labs, Jf, Lauber, Ja, Leith, Dwg, Liu, Mx, Lynch, Hl, Markiewicz, Tw, Mcgowan, Jf, Mckemey, Ak, Meadows, Bt, Mockett, Pm, Moffeit, Kc, 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FINCKE- KEELER, H.M. FISCHER, I. FLECK, R. FOLMAN, D.G.FONG, M. FORD, M. FOUCHER, A. FREY, A. FURTJES, H. FUKUI, C. FUKUNAGA, D.I. FUTYAN, P. GAGNON, A. GAIDOT, O. GANEL, J.W. GARY, J. GASCON, S.M. GASCON-SHOTKIN, G. GAYCKEN, N.I. GEDDES, C. GEICH-GIMBEL, S.W. GENSLER, F.X. GENTIT, T. GERALIS, G. GIACOMELLI, P. GIACOMELLI, R. GIACOMELLI, V. GIBSON, W.R. GIBSON, J.D. GILLIES, D.M. GINGRICH, M. GIUNTA, D. GLENZINSKI, J. GOLDBERG, M.J. GOODRICK, W. GORN, K. GRAHAM, C. GRANDI, F.C. GRANT, E. GROSS, J. GRUNHAUS, M. GRUWE, P.O. GUNTHER, A. GUPTA, J. HAGEMANN, C. HAJDU, M. HAMANN, G.G. HANSON, M. HANSROUL, M. HAPKE, K. HARDER, A. HAREL, C.K. HARGROVE, M. HARIN-DIRAC, P.F. HARRISON, P.A. HART, C. HARTMANN, P.M. HATTERSLEY, M. HAUSCHILD, C.M. HAWKES, R. HAWKINGS, E. HEFLIN, R.J. HEMINGWAY, C. HENSEL, G. HERTEN, R.D. HEUER, J.C. HILL, S.J. HILLIER, T. HILSE, D.A. HINSHAW, C. HO, J. HOARE, J.D. HOBBS, P.R. HOBSON, D. HOCHMAN, A. HOCKER, K. HOFFMAN, B. HOLL, R.J. HOMER, A.K. HONMA, D. 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MCGOWAN, A.K. MCKEMEY, B.T. MEADOWS, R. MESSNER, P.M. MOCKETT, K.C. MOFFEIT, T.B. MOORE, M. MORII, B. MOURS, D. MULLER, G. MUELLER, V. MURZIN, T. NAGAMINE, S. NARITA, U. NAUENBERG, H. NEAL, G. NESOM, M. NUSSBAUM, Y. OHNISHI, N. OISHI, D. ONOPRIENKO, L.S. OSBORNE, R.S. PANVINI, C.H.PARK, H. PARK, T.J. PAVEL, I. PERUZZI, L. PESCARA, M. PICCOLO, L. PIEMONTESE, E. PIERONI, K.T. PITTS, R.J. PLANO, R. PREPOST, C.Y. PRESCOTT, G. PUNKAR, J. QUIGLEY, B.N. RATCLIFF, K. REEVES, T.W. REEVES, J. REIDY, P.L. REINERTSEN, P.E. RENSING, L.S. ROCHESTER, J.E. ROTHBERG, P.C. ROWSON, J.J. RUSSELL, O.H. SAXTON, T. SCHALK, R.H. SCHINDLER, U. SCHNEEKLOTH, B.A. SCHUMM, J. SCHWIENING, A. SEIDEN, S. SEN, V.V. SERBO, L. SERVOLI, M.H. SHAEVITZ, J.T. SHANK, G. SHAPIRO, D.J. SHERDEN, K.D. SHMAKOV, C. SIMOPOULOS, N.B. SINEV, S.R. SMITH, M.B. SMY, J.A. SNYDER, M.D. SOKOLOFF, H. STAENGLE, A. STAHL, P. STAMER, H. STEINER, R. STEINER, M.G. STRAUSS, D. SU, F. SUEKANE, A. SUGIYAMA, A. SUZUKI, S. SUZUKI, M. SWARTZ, A. SZUMILO, T. TAKAHASHI, F.E. TAYLOR, J.J. THALER, J. THOM, E. TORRENCE, A.I. TRANDAFIR, J.D. TURK, T. USHER, J. VA VRA, C. VANNINI, E. VELLA, J.P. VENUTI, R. VERDIER, P.G. VERDINI, D.L. WAGNER, S.R. WAGNER, A.P. WAITE, S. WALSTON, J. WANG, S.J. WATTS, A.W. WEIDEMANN, E.R. WEISS, J.S. WHITAKER, S.L. WHITE, F.J. WICKENS, D.A. WILLIAMS, D.C. WILLIAMS, S.H. WILLIAMS, S. WILLOCQ, R.J. WILSON, W.J. WISNIEWSKI, J.L. WITTLIN, M. WOODS, G.B. WORD, T.R. WRIGHT, J. WYSS, R.K. YAMAMOTO, J.M. YAMARTINO, X.Q. YANG, J. YASHIMA, S.J. YELLIN, C.C.YOUNG, H.YUTA, G. ZAPALAC, R.W. ZDARKO, C. ZEITLIN, J. ZHOU, Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), GRUNEVALD M, NEWALD M, SCHAEL S, BARATE R, BRUNELIE, RE R, BUSKULIC D, DE BONIS I, DECAMP D, GHEZ P, GOY C, JE, ZE, QUEL S, LEES J, LUCOTTE A, MARTIN M, MERLE E, MINARD M, NIEF J, ODIER P, PIETRZYK B, TROCME, BRAVO S, CASADO MP, CHMEISSANI M, COMAS P, CRESPO JM, FERNANDEZ E, FERNANDEZ-BOSMAN M, GARRIDO L, GRAUGES E, JUSTE A, MARTINEZ M, MERINO G, MIQUEL R, MIR LM, ORTEU S, PACHECO A, PARK IC, PERLAS J, RIU I, RUIZ H, SANCHEZ F, COLALEO A, CREANZA D, DE FILIPPIS N, DE PALMA M, IASELLI G, MAGGI G, MAGGI M, NUZZO S, RANIERI, A, RASO, G, RUGGIERI F, SELVAGGI, G, SILVESTRIS L, TEMPESTA P, TRICOMI A, ZITO G, HUANG X, LIN J, OUYANG Q, WANG T, XIE Y, XU R, XUE S, ZHANG J, ZHANG L, ZHAO W, ABBANEO D, BAZARKO A, BECKER U, BOIX G, BIRD F, BLUCHER E, BONVICINI B, BRIGHT-THOMAS P, BARKLOW T, BUCHMU, LLER O, CATTANEO M, CERUTTI F, CIULLI V, CLERBAUX B, DREVERMANN H, FORTY RW, FRANK M, GREENING TC, HAGELBERG R, HALLEY AW, GIANOTTI F, GIRONE M, HANSEN JB, HARVEY J, JACOBSEN J, HUTCHCROFT DE, JANOT P, JOST B, KNOBLOCH J, KADO M, LEHRAUS I, LAZEYRAS P, and MALEY P

Subjects
Top quark, FORWARD-BACKWARD ASYMMETRY, PARTICLE PHYSICS, LARGE ELECTRON POSITRON COLLIDER, ALEPH, DELPHI, L3, OPAL, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Settore FIS/04 - Fisica Nucleare e Subnucleare, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), electron-positron physics, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Electroweak interaction, Physics, Quantum chromodynamics, Electron–positron physics, Electroweak interactions, Decays of heavy intermediate gauge bosons, Fermion–antifermion production, Precision measurements at the Z resonance, Tests of the Standard Model, Radiative corrections, Effective coupling constants, Neutral weak current, Z boson, W boson, Higgs boson, Particle physics - Experiment, Settore FIS/01 - Fisica Sperimentale, FERMION-PAIR PRODUCTION, HADRONIC-Z-DECAYS, TOP-QUARK MASS, ANGLE BHABHA SCATTERING, W-BOSON MASS, CROSS-SECTION ASYMMETRY, Z-LINE-SHAPE, SEMILEPTONIC BRANCHING RATIOS, CARLO EVENT GENERATOR, decays of heavy intermediate gauge bosons, effective coupling constants, electroweak interactions, fermion-antifermion production, higgs boson, neutral weak current, precision measurements at the z resonance, radiative corrections, tests of the standard model, top quark, w boson, z boson, Radiative correction, High Energy Physics - Phenomenology, FIS/01 - FISICA SPERIMENTALE, Física nuclear, Neutrino, Particle physics, FOS: Physical sciences, ddc:500.2, Elementary particle physics, LEP, electroweak, Decays of heavy intermediate gauge boson, Effective coupling constant, Partícules (Física nuclear), Standard Model, electroweak theory, Z boson, DELPHI, ALEPH, OPAL, L3, 0103 physical sciences, 010306 general physics, Coupling constant, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Fermion, FORWARD-BACKWARD ASYMMETRY, FERMION-PAIR PRODUCTION, HADRONIC-Z-DECAYS, TOP-QUARK MASS, ANGLE BHABHA SCATTERING, W-BOSON MASS, CROSS-SECTION ASYMMETRY, Z-LINE-SHAPE, SEMILEPTONIC BRANCHING RATIOS, CARLO EVENT GENERATOR, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Experimental High Energy Physics, Electron–positron physic, High Energy Physics::Experiment, FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
Abstract

We report on the final electroweak measurements performed with data taken at the Z resonance by the experiments operating at the electron-positron colliders SLC and LEP. The data consist of 17 million Z decays accumulated by the ALEPH, DELPHI, L3 and OPAL experiments at LEP, and 600 thousand Z decays by the SLD experiment using a polarised beam at SLC. The measurements include cross-sections, forward-backward asymmetries and polarised asymmetries. The mass and width of the Z boson, $\MZ$ and $\GZ$, and its couplings to fermions, for example the $\rho$ parameter and the effective electroweak mixing angle, are precisely measured. The number of light neutrino species is determined to be 2.9840+/-0.0082. The results are compared to the predictions of the Standard Model. Electroweak radiative corrections beyond the running of the QED and QCD coupling constants are observed with a significance of five standard deviations, and in agreement with the Standard Model. Of the many Z-pole measurements, the forward-backward asymmetry in b-quark production shows the largest difference with respect to its Standard Model expectation, at the level of 2.8 standard deviations. Through radiative corrections evaluated in the framework of the Standard Model, the masses of the top quark and the W Boson are predicted. These indirect constraints are compared to the direct measurements, providing a stringent test of the Standard Model. Using in addition the direct measurements of $\Mt$ and $\MW$, the mass of the as yet unobserved Standard Model Higgs boson is predicted., Comment: 302 pages, v2: minor corrections and updates of references. Accepted for publication by Physics Reports, v3: further small corrections and journal version

Published
2006

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