Author: "I. J., Bloodworth" - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"I. J., Bloodworth"' showing total 347 results

Start Over Author "I. J., Bloodworth"

347 results on '"I. J., Bloodworth"'

151. A search for scalar leptoquarks in Z0 decays

Author: H. E. Stier, P. G. Estabrooks, Erez Etzion, Gareth J. Barker, N. I. Geddes, P. Schenk, A. D. Schaile, Shlomit Tarem, P. M. Watkins, H. Mes, Kiyotomo Kawagoe, S. Rossberg, I. P. Duerdoth, V. H. Winterer, Tohru Takeshita, I. Wingerter, O. Schaile, A. P. Wagner, R. P. Middleton, B. Poli, S. R. Hou, J. M. Roney, Georges Azuelos, G. Beaudoin, L. Janissen, D. J. Miller, K. W. Bell, Max Weber, Misao Sasaki, H. O. Ogren, J. Goldberg, B. C. Shen, Shlomo Dado, H. Takeda, M. Hansroul, Christoph Geich-Gimbel, B. Nellen, N. Wermes, C. Milstene, P. Leblanc, F. Odorici, W. G. Scott, P. S. Wells, F. G. Oakham, C. J. Virtue, O. Runolfsson, X. C. Lou, P. G. Murphy, M. M. Deninno, Terry Richard Wyatt, B. Holl, J. Kroll, R. J. Homer, R. Kowalewski, L. Lessard, Andris Skuja, S. W. O'Neale, Ehud Duchovni, M. Coupland, T. J. Smith, F. X. Gentit, J. E. Conboy, J. D. Gillies, M. Ogg, M. J. Losty, Peter R Hobson, Giora Mikenberg, Silvia Arcelli, Claudio Grandi, P. Igo-Kemenes, D. C. Imrie, Richard Keeler, P. Mättig, I. Zacharov, C. Y. Chang, M. J. Goodrick, A. Pouladdej, I. Cohen, Tetsuro Mashimo, P. Singh, T. Mouthuy, C. Moisan, J. P. Walker, Horst Breuker, R. J. Barlow, G. Maringer, H. Ihssen, H. Jeremie, K. Stephens, C. Fukunaga, C. M. Hawkes, M. Cooper, Daniel Lellouch, R. Shypit, Takehiko Mori, G. K. VanDalen, P. W. Jeffreys, R. Van Kooten, F. S. Merritt, J. R. McNutt, G. P. Siroli, J. D. Hobbs, Claude Leroy, C. Wahl, P. Taras, S. W. Gensler, J. P. Pansart, R. W. L. Jones, N. C. Wood, W. Gorn, R. E. Hughes-Jones, U. Maur, Mitsuaki Nozaki, A. M. Lee, G. G. Hanson, F. Lamarche, D. E. Plane, R. J. Hemingway, Stephen Hillier, P. Le Du, H. Kreutzmann, B. Panzer-Steindel, V. Gibson, M. H. Lehto, M. A. Whalley, G. A. Bahan, J. Mildenberger, Harold Nguyen, Gunter Quast, S. Wotton, T. Kobayashi, G. M. Dallavalle, John Baines, Margret Fincke-Keeler, I. J. Bloodworth, C. P. Howarth, P. Jovanovic, E. K. U. Gross, A. Gaidot, M. Kuwano, Gideon Bella, H. J. Burckhart, N. K. Watson, M. Sproston, G. A. Snow, C. P. Ward, B. B. Brabson, M. Weymann, A. Buijs, J. E. Pilcher, Austin Ball, G. Giacomelli, J. Hart, E.J. Prebys, A. M. Rossi, D. E. Klem, D. R. Ward, M. Settles, D. Menszner, R. F. McGowan, D. G. Fong, Sachio Komamiya, Jacqueline Batley, B. P. O'Neill, Alan Watson, D. J.P. Dumas, P. Pfister, J. L. Pinfold, A. Astbury, J. Gascon, T. Tsukamoto, H. von der Schmitt, Alessandro Montanari, M. W. Moss, O. Ganel, S. Levegrün, H. M. Fischer, A. J. Martin, M. F. Turner, Y. Yang, P. Routenburg, P. M. Hattersley, T. P. Kokott, Rene Brun, J. Hagemann, J. C. Armitage, G. W. Wilson, D. Karlen, K. Riles, G. Eckerlin, M. S. Dixit, Frans Meijers, C. J. Oram, W. R. Gibson, P. F. Harrison, S. Bougerolle, W. J. Collins, S. J. Pawley, C. Ho, Marcello Mannelli, A. Michelini, Paul Kyberd, F. K. Loebinger, C. K. Hargrove, Stephen Lloyd, M. Jobes, U. Binder, D. Hochman, N. J. Thackray, P. Scharff-Hansen, G. D. Lafferty, A. Dieckmann, Claus Kleinwort, P. A. Elcombe, L. Köpke, W. J. Larson, P. Teixeira-Diaz, H. Przysiezniak, D. R. Rust, M. W. Redmond, J. W. Gary, T. W. Pritchard, J. G. Layter, A. Beck, A. Rollnik, A. M. Smith, P. E.L. Clarke, T. Behnke, E. Heflin, G. Vasseur, B. Lorazo, P. Lennert, Phillip Allport, R. M. Brown, S. Sanghera, M. Hauschild, S. A. Robins, R. Sobie, M. Jimack, John Allison, J. P. Martin, Gideon Alexander, Lorne Levinson, Paolo Capiluppi, K. J. Anderson, John Hill, P. Paschievici, B. W. Kennedy, S. De Jong, R. G. Kellogg, J. Banks, D. L. Rees, J. Becker, R. Yaari, S. Weisz, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, S. Bethke, Marco Cuffiani, Stefano Marcellini, P. Debu, P R Poffenberger, J. M. Lorah, W. Mohr, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, R. W. Springer, Michael Dittmar, G. Yekutieli, J. Ludwig, K. Runge, P. Bock, A. Simon, Otmar Biebel, D. G. Charlton, M. Couch, R. Humbert, G. Duckeck, A. A. Carter, J. T.M. Chrin, D. Strom, G. T. Zorn, H. M. Bosch, T. Kawamoto, Wolfram Dietrich Zeuner, S. Orito, John H. Schwarz, D. A. Hinshaw, R. Mir, H. Oh, M. J. Oreglia, J. R. Carter, G. N. Patrick, J. von Krogh, P. Ashton, Dave Robinson, S. Schreiber, T. J. McMahon, R. K. Carnegie, J. A. Wilson, and W. Schappert
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, Electron–positron annihilation, High Energy Physics::Phenomenology, Scalar (physics), Nuclear physics, High Energy Physics::Experiment, Leptoquark, Neutrino, Particle Physics - Experiment, Storage ring, Lepton
Abstract: A search for scalar leptoquarks has been performed with data from the OPAL detector at the e+e− storage ring LEP. In a data sample corresponding to an integrated luminosity of 6.3 pb−1 no evidence for leptoquark production was observed where the leptoquark decays into a quark and either a charged lepton (e, μ, τ) or a neutrino. An upper limit of 1.7 pb on the production cross section for leptoquarks is obtainedassuming a branching ratio of 50% for the decay of the leptoquark into the channels with a charged lepton. Lower limits on the leptoquark mass between 41.4 and 46.4 GeV/c2 at 95% CL are obtained, depending on the effecte SU(2) × U(1) invariant couplings assigned to the leptoquark.
Published: 1991

152. Measurement of theZ 0 line shape parameters and the electroweak couplings of charged leptons

Author: M. Jimack, John Allison, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, R. W. Springer, B. Holl, N. C. Wood, C. M. Hawkes, M. Cooper, Daniel Lellouch, J. Ludwig, G. J. Van Dalen, K. Runge, P. Bock, A. Simon, Otmar Biebel, D. G. Charlton, Takehiko Mori, I. Zacharov, Horst Breuker, G. A. Snow, C. P. Ward, M. Couch, A. D. Schaile, R. G. Kellogg, C. Y. Chang, P. Taras, Mitsuaki Nozaki, D. A. Hinshaw, R. Humbert, J. T.M. Chrin, Stefano Marcellini, V. H. Winterer, O. Runolfsson, T. Kawamoto, T. J. Smith, S. Orito, S. Bougerolle, P. Mättig, L. Lessard, John H. Schwarz, T. R. Wyatt, Claudio Grandi, S. R. Hou, Gunter Quast, P. Singh, T. Mouthuy, J. M. Lorah, W. Mohr, R. Mir, H. Oh, I. J. Bloodworth, J. G. Layter, S. Sanghera, F. S. Merritt, M. Settles, R. W. L. Jones, G. Beaudoin, M. J. Oreglia, W. J. Collins, G. D. Lafferty, P. Le Du, J. Hart, Y. Yangh, H. Kreutzmann, B. Panzer-Steindel, H. Przysiezniak, A. M. Rossi, K. J. Anderson, A. Astbury, G. Duckeck, D. Karlen, W. R. Gibson, Tohru Takeshita, D. Strom, P. E.L. Clarke, T. Behnke, Paul Kyberd, F. K. Loebinger, G. Giacomelli, T. Tsukamoto, Shlomo Dado, S. Levegrün, G. T. Zorn, T. W. Pritchard, Georges Azuelos, H. M. Bosch, Wolfram Dietrich Zeuner, C. Moisan, J. R. Carter, O. Ganel, P. W. Jeffreys, P. Igo-Kemenes, G. Maringer, G. N. Patrick, K. W. Bell, J. P. Walker, C. Ho, X. C. Lou, Gideon Bella, D. Hochman, N. J. Thackray, H. J. Burckhart, Jacqueline Batley, M. W. Redmond, A. M. Lee, P. G. Murphy, A. J. Martin, Max Weber, H. Jeremie, K. Stephens, A. Rollnik, D. E. Klem, Kiyotomo Kawagoe, R. F. McGowan, J. C. Hill, Giora Mikenberg, J. R. McNutt, B. C. Shen, C. Fukunaga, A. Beck, M. A. Whalley, K. Riles, R. E. Hughes-Jones, U. Maur, R. Van Kooten, E. K. U. Gross, P. Teixeira-Dias, E. Heflin, A. Gaidot, Erez Etzion, M. Kuwano, W. G. Scott, M. Sproston, G. Eckerlin, Gareth J. Barker, R. M. Brown, Lorne Levinson, A. P. Wagner, P. Routenburg, A. Dieckmann, V. Gibson, John Baines, R. Kowalewski, M. J. Losty, M. F. Turner, P. Poffenberger, N. I. Geddes, Shlomit Tarem, P. A. Elcombe, Silvia Arcelli, J. L. Pinfold, A. Buijs, M. H. Lehto, H. O. Ogren, Christoph Geich-Gimbel, J. P. Martin, M. Sasaki, S. De Jong, B. W. Kennedy, D. L. Rees, J. Becker, B. Poli, S. Rossberg, C. J. Oram, D. R. Ward, P. F. Harrison, Stephen Lloyd, J. M. Roney, R. Yaari, S. Bethke, C. K. Hargrove, M. M. Deninno, H. M. Fischer, P. Debu, J. Mildenberger, Harold Nguyen, R. P. Middleton, Marco Cuffiani, J. Kroll, A. Michelini, J. D. Hobbs, F. X. Gentit, N. Wermes, G. G. Hanson, J. E. Conboy, M. Ogg, Ehud Duchovni, R. Shypit, S. A. Robins, D. E. Plane, Stephen Hillier, Michael Dittmar, E.J. Prebys, G. M. Dallavalle, A. Pouladdej, H. Ihssen, B. P. O'Neill, G. Yekutieli, M. S. Dixit, Frans Meijers, Alan Watson, D. J.P. Dumas, J. Hagemann, S. W. Gensler, J. Goldberg, B. Nellen, P. Leblanc, O. Schaile, D. C. Imrie, A. A. Carter, M. J. Goodrick, T. Kobayashi, M. Hansroul, S. W. O'Neale, Peter R Hobson, I. Cohen, S. J. Pawley, Phillip Allport, Claus Kleinwort, L. Köpke, R. J. Homer, S. Wotton, Margret Fincke-Keeler, G. P. Siroli, G. W. Wilson, M. Hauschild, P. S. Wells, D. R. Rust, P. Paschievici, C. J. Virtue, P. Pfister, Gideon Alexander, J. C. Armitage, M. Coupland, Paolo Capiluppi, P. Schenk, P. Lennert, S. Schreiber, M. Weymann, T. J. McMahon, Richard Keeler, C. Wahl, C. P. Howarth, J. E. Pilcher, R. K. Carnegie, H. E. Stier, R. Sobie, N. K. Watson, Claude Leroy, M. W. Moss, J. A. Wilson, J. P. Pansart, P. M. Hattersley, Sachio Komamiya, P. G. Estabrooks, W. Schappert, T. P. Kokott, Rene Brun, J. Banks, P. M. Watkins, S. Weisz, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, I. Wingerter, J. von Krogh, P. Ashton, Dave Robinson, H. Mes, I. P. Duerdoth, L. Janissen, C. Milstene, F. Odorici, Andris Skuja, Tetsuro Mashimo, W. Gorn, G. A. Bahan, M. Jobes, U. Binder, P. Scharff-Hansen, W. J. Larson, J. W. Gary, A. M. Smith, G. Vasseur, B. Lorazo, B. B. Brabson, D. G. Fong, J. Gascon, H. von der Schmitt, Marcello Mannelli, H. Takeda, F. G. Oakham, J. D. Gillies, R. J. Barlow, D. J. Miller, F. Lamarche, R. J. Hemingway, P. Jovanovic, Austin Ball, D. Menszner, and Alessandro Montanari
Subjects: Physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Electroweak interaction, Weinberg angle, Standard Model, Nuclear physics, High Energy Physics::Experiment, Engineering (miscellaneous), Pseudovector, Boson, Lepton
Abstract: We report on an improved measurement of the mass of theZ0 boson, its total width and its partial decay widths into hadrons and leptons, as well as the effective axial vector and vector couplings to charged leptons. These measurements are based on a data set of approximately 160 000 hadronicZ0 decays and 18 000 decays into electrons, muons and taus, recorded by the OPAL experiment at centre of mass energies near the mass of theZ0. The total width and the partial widths to visible final states, derived from the measured cross sections, are used to extract the invisible width. The effective couplings of theZ0 to charged leptons are studied using measurements of the lepton pair cross sections and forward-backward asymmetries at the different centre of mass energy points of theZ0 scan. The implications of our results in the context of the Standard Model are discussed.
Published: 1991

153. A study of - in Z0 decays

Author: Gideon Bella, H. J. Burckhart, Jacqueline Batley, M. Jobes, F. Odorici, R. Mir, U. Binder, H. Oh, H. O. Ogren, Michael Dittmar, C. M. Hawkes, M. Cooper, Daniel Lellouch, F. S. Merritt, G. Yekutieli, R. F. McGowan, Christoph Geich-Gimbel, Silvia Arcelli, M. M. Deninno, Tohru Takeshita, P. Scharff-Hansen, J. Kroll, F. X. Gentit, J. E. Conboy, Paul Kyberd, M. Ogg, R. Shypit, Takehiko Mori, T. Mouthuy, F. K. Loebinger, M. W. Moss, P. Igo-Kemenes, A. Pouladdej, G. Maringer, M. J. Oreglia, H. Jeremie, C. Moisan, J. P. Walker, F. Lamarche, R. E. Hughes-Jones, N. C. Wood, U. Maur, W. J. Larson, J. D. Hobbs, Georges Azuelos, P. M. Hattersley, H. Mes, M. W. Redmond, R. J. Hemingway, I. P. Duerdoth, R. Van Kooten, G. G. Hanson, P. Singh, J. W. Gary, A. Rollnik, K. W. Bell, P. Teixeira-Dias, G. A. Snow, C. P. Ward, A. A. Carter, G. Giacomelli, Max Weber, P. E.L. Clarke, M. Sprotson, J. R. Carter, A. M. Rossi, K. J. Anderson, Misao Sasaki, T. Behnke, R. W. L. Jones, M. H. Lehto, L. Janissen, B. C. Shen, P. Jovanovic, A. M. Smith, G. N. Patrick, E.J. Prebys, Austin Ball, Kiyotomo Kawagoe, T. Tsukamoto, D. E. Klem, S. Levegrün, D. Menszner, R. Sobie, G. Vasseur, B. Lorazo, S. Wotton, P. Le Du, W. G. Scott, M. S. Dixit, Frans Meijers, G. Beaudoin, M. Jimack, John Allison, H. Kreutzmann, B. Panzer-Steindel, D. Hochman, N. J. Thackray, I. J. Bloodworth, A. Simon, Otmar Biebel, E. K. U. Gross, A. P. Wagner, Alessandro Montanari, Gunter Quast, M. Weymann, K. Stephens, J. M. Roney, N. I. Geddes, R. Yaari, D. G. Charlton, J. R. McNutt, A. Gaidot, M. Couch, M. F. Turner, M. Kuwano, R. Kowalewski, M. Geerts, J. P. Martin, S. Bethke, B. B. Brabson, Shlomo Dado, C. Fukunaga, R. Humbert, Marco Cuffiani, M. Settles, H. E. Stier, John Hill, B. Poli, D. G. Fong, J. Gascon, X. C. Lou, S. De Jong, H. von der Schmitt, S. Schreiber, J. T.M. Chrin, M. J. Losty, G. Duckeck, T. J. McMahon, J. D. Gillies, P. G. Estabrooks, R. G. Kellogg, P. Routenburg, P. G. Murphy, D. Strom, V. Gibson, B. P. O'Neill, J. Hart, H. M. Fischer, T. Kawamoto, A. Michelini, Giora Mikenberg, G. T. Zorn, John Baines, R. J. Barlow, A. Astbury, P. M. Watkins, P. Debu, G. W. Wilson, Marcello Mannelli, R. K. Carnegie, Stefano Marcellini, A. Dieckmann, S. Orito, John H. Schwarz, J. Hagemann, D. Karlen, J. A. Wilson, D. C. Imrie, Y. Yang, C. Y. Chang, M. Fincke-Keeler, H. M. Bosch, Wolfram Dietrich Zeuner, Andris Skuja, S. A. Robins, I. Wingerter, J. L. Pinfold, O. Ganel, Tetsuro Mashimo, J. G. Layter, P. Taras, A. J. Martin, D. R. Ward, C. J. Oram, P. F. Harrison, Mitsuaki Nozaki, K. Riles, G. P. Siroli, W. Schappert, W. Gorn, J. Mildenberger, S. Bougerolle, G. A. Bahan, W. J. Collins, Harold Nguyen, S. Sanghera, Stephen Lloyd, J. M. Lorah, Erez Etzion, D. E. Plane, G. D. Lafferty, Gareth J. Barker, C. K. Hargrove, B. Holl, D. A. Hinshaw, Shlomit Tarem, W. Mohr, P. Pfister, Stephen Hillier, G. M. Dallavalle, G. Eckerlin, T. J. Smith, Phillip Allport, P. A. Elcombe, S. Rossberg, T. W. Pritchard, H. Takeda, I. Zacharov, J. C. Armitage, R. P. Middleton, F. G. Oakham, Alan Watson, D. L. Rees, D. J.P. Dumas, J. Becker, P. Mättig, S. J. Pawley, Horst Breuker, G. J. VanDalen, B. Nellen, P. Leblanc, M. Hansroul, W. R. Gibson, C. Ho, Claus Kleinwort, L. Köpke, R. J. Homer, D. Axen, P. Schenk, A. D. Schaile, A. Beck, A. Jawahery, Gideon Alexander, Paolo Capiluppi, G. Tysarczyk-Niemeyer, E. Heflin, M. J. Goodrick, I. Cohen, R. M. Brown, Lorne Levinson, N. Wermes, B. W. Kennedy, Ehud Duchovni, D. R. Rust, H. Ihssen, S. W. Gensler, T. Kobayashi, P. Lennert, J. Banks, S. Weisz, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, J. von Krogh, Peter Sherwood, R. W. Springer, J. Ludwig, K. Runge, P. Bock, P. Ashton, Dave Robinson, Sachio Komamiya, V. H. Winterer, S. R. Hou, T. P. Kokott, Rene Brun, N. K. Watson, S. W. O'Neale, Peter R Hobson, M. Hauschild, P. Paschievici, P R Poffenberger, D. J. Miller, H. Przysiezniak, O. Runolfsson, C. Wahl, L. Lessard, Claudio Grandi, P. W. Jeffreys, P. S. Wells, A. M. Lee, C. J. Virtue, C. P. Howarth, Terry Richard Wyatt, J. E. Pilcher, M. Coupland, O. Schaile, M. A. Whalley, A. Buijs, Richard Keeler, Claude Leroy, J. P. Pansart, and C. Milstene
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, Branching fraction, High Energy Physics::Lattice, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Elementary particle, Nuclear physics, Pair production, Pion, High Energy Physics::Experiment, Nuclear Experiment
Abstract: In this paper an investigation of the production of D ∗ ± mesons produced in e + e − collisions at energies around the Z 0 pole is presented. Based on 115 D ∗ ± mesons with x D∗  2E D ∗ /E cm > 0.2 the properties of D ∗ mesons produced in the reaction Z 0 → c c are studied. Fixing the yield and the fragmentation function of bottom quarks to the values obtained at LEP using lepton tags, and average energy fraction of the D ∗ ± mesons from primary charmed quarks of 〈x c → D ∗ 〉 = 0.52 ± 0.03 +- 0.01 is found and Γ z 0 →c c = (323 ± 61 ± 35) MeV is determined. The first error is the combined statistical and systematic error from this experiment, and the second the total error from other sources.
Published: 1991

154. Λ and anti-Λ production in 32S + W and p + W interactions at 200 A GeV/c

Author: R. Zitoun, V. Lenti, K. Knudson, J. N. Carney, M. T. Trainer, B. R. French, David H. Evans, I. J. Bloodworth, K. Manzari, A. Malamant, B. Ghidini, A. Jacholkowski, E. Quercigh, S. Abatzis, R. A. Loconsole, A. Bravar, W. Beusch, R. P. Barnes, Ph. Leruste, A. Volte, M. Benayoun, F. Navach, R. Sené, J. Kahane, A. Kirk, R. Fini, J. C. Lassalle, O. Villalobos Baillie, M. Tamazouzt, L. Lima Frances, J.B. Kinson, A. Penzo, J. P. Dufey, A. Palano, M. Stassinaki, M. Sené, M.F. Votruba, Leonardo Paolo Rossi, J. L. Narjoux, and G. Vassiliadis
Subjects: Nuclear reaction, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle decay, Meson, Hadron, Hyperon, Nucleon, Lambda baryon, Boson
Published: 1991

155. Multi-strange baryon and antibaryon production in sulphur-tungsten and proton-tungsten interactions at 200 GeV/c per nucleon

Author: E. Quercigh, S. Abatzis, M. Sene, R. P. Barnes, B. Ghidini, F. Navach, J. P. Dufey, R. A. Fini, A. Palano, I. J. Bloodworth, O. Villalobos Baillie, A. Malamant, R. Falcone, M. T. Trainor, A. Volte, A. Bravar, J. Kahane, A. Kirk, Vito Manzari, G. Vassiliadis, R. Sené, W. Beusch, M.F. Votruba, B. R. French, M. Tamazouzt, R. A. Loconsole, Ph Leruste, J.B. Kinson, A. Penzo, M. Benayoun, K. Knudson, J. N. Carney, Leonardo Paolo Rossi, J. L. Narjoux, V. Lenti, M. Stassinaki, A. Jacholkowski, J. C. Lassalle, L. Lima Frances, and D. Evans
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Hyperon, Lambda baryon, Xi baryon, Nuclear physics, Baryon, Strange matter, Nuclear Experiment, Nucleon
Abstract: Production of multi-strange baryons and antibaryons is expected to be a useful indicator in the search for Quark-Gluon Plasma formation. Production of Ξ− and Ξ − has been observed for the first time in ultra-relativistic heavy ion interactions by the WA85 Experiment. We describe the procedure used to select these cascade candidates and show that Ξ− and Ξ − decays can be identified. Preliminary ratios of Ξ/Ξ production in sulphur-tungsten and proton-tungsten interactions are also presented.
Published: 1991

156. A measurement of energy correlations and a determination of αs(M2Z) e+e- annihilations at √s=91 GeV

Author: F. X. Gentit, F. Odorici, H. Takeda, G. A. Snow, C. P. Ward, C. Y. Chang, M. S. Dixit, G. Mikenberg, G.W. Wilson, L. Janissen, R. Stroehmer, W. J. Collins, M. T. French, Mitsuaki Nozaki, Christoph Geich-Gimbel, P. Singh, Erez Etzion, B. J. Saunders, Gareth J. Barker, D. C. Imrie, T. W. Pritchard, P. Igo-Kemenes, S. Rossberg, Michael Dittmar, M. M. Deninno, M. J. Losty, R. W. L. Jones, R. P. Middleton, J. Kroll, G. Yekutieli, G. Maringer, T. Mashino, J. Goldberg, H. Jeremie, B. Nellen, Shlomo Dado, S. L. Lloyd, G. P. Siroli, P. Leblanc, P. Le Du, H. Kreutzmann, R. G. Kellogg, J. E. Conboy, R. E. Hughes-Jones, U. Maur, A. A. Carter, A. Jawahery, J.P. Pansart, N. K. Watson, P. G. Murphy, J. Grunhaus, M. Ogg, J. D. Gillies, M. J. Goodrick, Stefano Marcellini, T. J. Smith, H. Oh, I. Cohen, G. Tysarczyk-Niemeyer, D. G. Fong, V. Gibson, Kiyotomo Kawagoe, K. J. Anderson, A. Pouladdej, Peter Sherwood, Gideon Bella, J. Gascon, S. Wotton, N. C. Wood, H. J. Burckhart, P. Mättig, B. C. Shen, B. Wuensch, A. M. Rossi, J. M. Lorah, M. Weymann, G. D. Lafferty, Takashi Yoshida, R. W. Springer, A. P. Wagner, J. M. Roney, H. von der Schmitt, C. Fukunaga, D. E. Klem, G.T.J. Arnison, D. J. Miller, A. Buijs, J. Ludwig, K. Runge, P. Bock, Jacqueline Batley, A. A. Macbeth, M. Hauschild, Makoto Minowa, W. Mohr, I. J. Bloodworth, T. Tsukamoto, H. E. Stier, G. Knop, J. Mildenberger, Harold Nguyen, J. Hagemann, M. F. Turner, P. G. Estabrooks, S. Schreiber, T. J. McMahon, R. K. Carnegie, N. I. Geddes, M. Jimack, D. Karlen, O. Ganel, A. J. Martin, F. Lamarche, P. Lennert, Marcello Mannelli, T. P. Kokott, Rene Brun, C. N. P. Gee, J. A. Wilson, B. Poli, F. S. Merritt, C. M. Hawkes, J. Allison, Daniel Lellouch, P. M. Watkins, M. Jobes, U. Binder, W. J. Murray, R. J. Hemingway, R. Kowalewski, H. M. Fischer, D. Granite, Takehiko Mori, J. Ma, W. Schappert, D. Strom, P. Scharff-Hansen, Paul Kyberd, F. K. Loebinger, G. T. Zorn, P. Jovanovic, A. Michelini, I. Wingerter, W. J. Larson, J. D. Hobbs, M. Sasaki, E. K. U. Gross, A. Gaidot, P. E.L. Clarke, M. Kuwano, T. Behnke, Austin Ball, D. Menszner, M. W. Redmond, Wolfram Dietrich Zeuner, K. Riles, J. L. Pinfold, J. W. Gary, S. A. Robins, M. Sproston, A. Rollnik, M. W. Moss, M. Z. Akrawy, I. Harrus, A. M. Smith, P. M. Hattersley, M. J. Oreglia, M. H. Lehto, P. Routenburg, J. R. Carter, Alessandro Montanari, A. Dieckmann, H. Mes, G. Vasseur, J. von Krogh, J. Raab, B. Lorazo, F. G. Oakham, Andris Skuja, P. A. Elcombe, P. Ashton, B. Holl, S. W. O'Neale, Peter R Hobson, H. El Mamouni, Tohru Takeshita, R. Yaari, S. Bethke, Marco Cuffiani, D. L. Rees, A. Shapira, J. Becker, A. D. Schaile, I. P. Duerdoth, Georges Azuelos, S. J. Pawley, Claus Kleinwort, L. Köpke, Horst Breuker, G. N. Patrick, A. Simon, Otmar Biebel, K. W. Bell, Max Weber, O. Schaile, W. Gorn, P. S. Wells, J. C. Hill, G. Giacomelli, C. J. Virtue, Terry Richard Wyatt, D. G. Charlton, A. T. Watson, M. Coupland, E.J. Prebys, J. Banks, Gunter Quast, M. Couch, S. Weisz, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, R. Humbert, Frans Meijers, J. T.M. Chrin, T. Kawamoto, V. H. Winterer, S. Orito, John H. Schwarz, S. R. Hou, J. G. Layter, C. Wahl, C. P. Howarth, J. E. Pilcher, N. Wermes, C. K. Hargrove, Ehud Duchovni, R. A. Sansum, H. Ihssen, S. Sanghera, S. W. Gensler, Phillip Allport, J. P. Martin, C. M. Roach, B.P. O'Neil, D. E. Plane, Stephen Hillier, G. M. Dallavalle, P. Farthouat, Gideon Alexander, Paolo Capiluppi, D. Hochman, N. J. Thackray, J. Hart, G. J. VanDalen, R. J. Barlow, P. Pfister, Y. Yang, D. J.P. Dumas, P. W. Jeffreys, J. C. Armitage, T. Kobayashi, A. M. Lee, K. Stephens, J. R. McNutt, P. Debu, M. Hansroul, R. J. Homer, John Baines, M. Regimbald, O. Runolfsson, A. J.P. O'Dowd, J. P. Walker, D. R. Ward, W. R. Gibson, C. Ho, A. Beck, E. Heflin, R. M. Brown, Lorne Levinson, L. Lessard, B. W. Kennedy, C. Milstene, and H. Hagedorn
Subjects: Coupling constant, Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Electron–positron annihilation, Hadron, Nuclear physics, Renormalization, Particle decay, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Boson
Abstract: From an analysis of multi-hadron events from Z 0 decays, values of the strong coupling constant α s ( M 2 Z 0 )=0.131±0.006 (exp)±0.002(theor.) and α s ( M z 0 2 ) = −0.009 +0.007 (exp.) −0.002 +0.006 (theor.) are derived from the energy-energy correlation distribution and its asymmetry, respectively, assuming the QCD renormalization scale μ = M Z 0 . The theoretical error accounts for differences between O ( α 2 s ) calculations. A two parameter fit Λ MS and the renormalization scale μ leads to Λ MS =216±85 MeV and μ 2 s =0.027±0.013 or to α s ( M 2 Z 0 )=0.117 +0.006 −0.008 (exp.) for the energy-energy correlation distribution. The energy-energy correlation asymmetry distribution is insensitive to a scale change: thus the α s value quoted above for this variable includes the theoretical uncertainty associated with the renormalization scale.
Published: 1990

157. A study of the centrally producedK 0 $$K^{0} \bar K^{*0} $$ final state in the reactionpp→p f (K + K -π+π-)p s at 300 GeV/c

Author: V. Lenti, O. Villalobos Baillie, G. Vassiliadis, I. J. Bloodworth, M. Stassinaki, B. R. French, R. Childs, B. Ghidini, M. T. Trainor, F. Navach, M.F. Votruba, J.B. Kinson, E. Quercigh, J. Kahane, A. Jacholkowski, T. A. Armstrong, R. Sené, A. Palano, W. Beusch, M. Benayoun, K. Knudson, Leonardo Paolo Rossi, J. N. Carney, J. L. Narjoux, M. Sené, Ph. Leruste, A. Kirk, R. Zitoun, N. G. Redaelli, Giuseppe Zito, and A. Malamant
Subjects: Particle acceleration, Physics, Physics and Astronomy (miscellaneous), Production (computer science), Field theory (psychology), Elementary particle, State (functional analysis), Quantum field theory, Atomic physics, Engineering (miscellaneous), Bar (unit)
Abstract: The reactionpp→pf(K+K-π+π-)ps, where theK+K− π+π- system is centrally produced, has been studied at 300 GeV/c. TheK*0$K^{*0} \bar K^{*0} $ final state has been observed and the cross sections for its central production are found to be the same at 300 and 85 GeV/c. TheK*0$K^{*0} \bar K^{*0} $ final state appears to be produced as a non-resonant threshold enhancement.
Published: 1990

158. A search for non-q mesons in the central region

Author: A. Malamant, I. J. Bloodworth, A. Palano, C. Evangelista, B. Ghidini, T. A. Armstrong, V. Lenti, G. Vassiliadis, F. Navach, E. Quercigh, Leonardo Paolo Rossi, A. Kirk, W. Beusch, B. R. French, R. Childs, K. Knudson, J. N. Carney, M.F. Votruba, M. Stassinaki, A. Jacholkowski, J. L. Narjoux, Ph. Leruste, M. T. Trainor, N. G. Redaelli, Maria Girone, M. Sené, J. Kahane, J.B. Kinson, O. Villalobos Baillie, R. Sené, and M. Benayoun
Subjects: Physics, Nuclear physics, Momentum, Nuclear and High Energy Physics, Particle physics, Meson, State (functional analysis), Central region, Atomic and Molecular Physics, and Optics
Abstract: The aim of this experiment is to search for non-qq mesons in the reaction pp→pf(XO)ps at 300 GeV/c incident momentum, where the XO system is a centrally produced meson. The θ/f2(1720), E/f1(1420) and a new state in the 2π+2π− channel are presented as candidate non-qq mesons.
Published: 1990

159. Strangeness production in sulphur-tungsten interactions at 200 GeV/c per nucleon

Author: J. L. Narjoux, Michele Arturo Caponero, G. Vassiliadis, R. Zitoun, A. Volte, R. Fini, M.F. Votruba, A. Malamant, J. C. Lassalle, R. Sené, B. R. French, A. Kirk, D. Evans, J.B. Kinson, A. Penzo, W. Beusch, M. Benayoun, F. Navach, V. Lenti, K. Knudson, R. Falcone, M. Sené, J. Kahane, M. Stassinaki, B. Ghidini, I. J. Bloodworth, A. Bravar, E. Quercigh, J. N. Carney, A. Jacholkowski, M. T. Trainor, J. P. Dufey, A. Palano, R. A. Loconsole, Ph. Leruste, S. Abatzis, O. Villalobos Baillie, and Leonardo Paolo Rossi
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Particle physics, Hadron, Strangeness production, Strangeness, Lambda baryon, Atomic and Molecular Physics, and Optics, Charged particle, Nuclear physics, Baryon, High Energy Physics::Experiment, Nuclear Experiment, Nucleon, Particle Physics - Experiment
Abstract: Preliminary results from the WA85 Experiment at the CERN Omega Spectrometer are presented. A 200 A GeV/c beam of 22S ions was used with a tungsten target. The apparatus is used to detect V°s and charged tracks in the range PT > 0.9 GeV/c and 2.3 Λ, Λ and cascade particles is discussed. A study of the multiplicity dependence of Λ, Λ and hadron production is presented.
Published: 1990

160. Λ and production in sulphur-tungsten interactions at 200 GeV/c per nucleon

Author: W. Beusch, M. Benayoun, F. Navach, M. Stassinaki, A. Volte, R. Sené, E. Quercigh, R. Zitoun, J. Kahane, Leonardo Paolo Rossi, David H. Evans, Michele Arturo Caponero, B. Ghidini, A. Bravar, A. Malamant, R. Fini, A. Jacholkowski, J. L. Narjoux, M. T. Trainor, R. A. Loconsole, B. R. French, A. Kirk, Ph. Leruste, M.F. Votruba, J. C. Lassalle, I. J. Bloodworth, J. P. Dufey, M. Tamazouzt, A. Palano, M. Sené, S. Abatzis, V. Lenti, K. Knudson, J. N. Carney, J.B. Kinson, A. Penzo, L. Lima Frances, G. Vassiliadis, O. Villalobos Baillie, and R. P. Barnes
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Meson, Hadron, Lambda baryon, Charged particle, Nuclear physics, Antimatter, High Energy Physics::Experiment, Rapidity, Atomic physics, Nuclear Experiment, Nucleon
Abstract: Results from the WA85 Experiment at the CERN Ω Spectrometer are presented. A 200 A GeV/ c beam of 32 S ions was used with a tungsten target. The apparatus is used to detect V 0, s and charged tracks in the range p T > 0.9 GeV/ c and 2.3 Y lab Λ and negative hadrons all show a linear increase with rapidity density in the range 70–140 as expected from models based on a superposition of independent NN collisions.
Published: 1990

161. A study of the centrally produced ?+???0 system formed in the reactionpp?p f (?+???0)p s at 300 GeV/c

Author: R. Childs, M.F. Votruba, E. Quercigh, O. Villalobos Baillie, N. G. Redaelli, Maria Girone, W. Beusch, Leonardo Paolo Rossi, M. Benayoun, J. Kahane, I. J. Bloodworth, V. Lenti, A. Kirk, A. Jacholkowski, Ph. Leruste, J.B. Kinson, M. T. Trainor, J. L. Narjoux, A. Palano, M. Stassinaki, B. R. French, C. Evangelista, B. Ghidini, R. Sené, G. Vassiliadis, K. Knudson, J. N. Carney, M. Sené, A. Malamant, F. Navach, and T. A. Armstrong
Subjects: Nuclear physics, Physics, Particle acceleration, Physics and Astronomy (miscellaneous), S-wave, Mass spectrum, Dalitz plot, Field theory (psychology), Elementary particle, Atomic physics, Quantum field theory, Engineering (miscellaneous)
Abstract: The reactionpp→p f (π+π−π0)p s , where the π+π−π0 system is centrally produced, has been studied at 300 GeV/c. The π+π−π0 mass spectrum shows evidence for the η, ω anda 2 (1320) as well as an enhancement in thea 1 (1260) region. A Dalitz plot analysis of the π+π−π0 system has been performed. Thea 1 (1260) parameters coming from the fit of the 1+ S wave arem=1208±15 MeV and Γ=430±50 MeV. No evidence is found for theh 1(1170) orh 1(1380).
Published: 1990

162. Measurements of the decay of the Z0 into lepton pairs

Author: J. Waterhouse, B. J. Saunders, Phillip Allport, B. C. Shen, H. M. Fischer, T. J. McMahon, J. C. Armitage, E. J. Spreadbury, D. Duchesneau, J. A. Wilson, P. Grosse-Wiesmann, A. J.P. O'Dowd, I. Cohen, P. Le Du, D. Granite, C. Milstene, R. W.L. Jones, D. G. Fong, E. Jin, H. von der Schmitt, D. J.P. Dumas, S. R. Hou, Gideon Bella, J. von Krogh, J. Raab, G. A. Snow, C. P. Ward, G. Knop, Despina Hatzifotiadou, H. J. Burckhart, H. Jeremie, H. Kreutzmann, Jacqueline Batley, C. Geich-Gimbel, P. Ashton, R. M. Brown, G. T.J. Arnison, Marcello Mannelli, H. Wang, Andris Skuja, F. S. Merritt, G. D. Lafferty, Michael Dittmar, Kiyotomo Kawagoe, Tetsuro Mashimo, J. L. Pinfold, Gunter Quast, C. J. Virtue, J. P. Martin, F. Roehner, P. Kyberd, Paolo Capiluppi, J. M. Roney, Tohru Takeshita, K. W. Bell, P. Bock, D. G. Charlton, M. Couch, A. M. Rossi, D. E. Plane, W. Gorn, P. A. Elcombe, G. Yekutieli, W. R. Gibson, T. P. Kokott, B. Holl, Stephen Hillier, J. Heintze, P. G. Estabrooks, M. Jobes, D. Hochman, I. P. Duerdoth, D. L. Rees, P. Routenburg, R. Kowalewski, S. Schreiber, J. T.M. Chrin, C. K. Hargrove, C. M. Roach, B. P. O'Neill, D. Karlen, N. Lupu, A. Dieckmann, C. Fukunaga, P. Scharff-Hansen, W. J. Larson, A. Buijs, G. J. VanDalen, H. Boerner, G. P. Siroli, A. Jawahery, Peter Sherwood, T. Kawamoto, M. Jimack, R. W. Springer, M. Coupland, N. K. Watson, P. G. Murphy, U. Maur, C. N.P. Gee, A. M. Smith, H. El Mamouni, D. Strom, Horst Breuker, G. T. Zorn, P. M. Watkins, P. Igo-Kemenes, Wolfram Dietrich Zeuner, F. Beck, R. Ströhmer, A. Wagner, Rolf-Dieter Heuer, T. Tsukamoto, G. N. Patrick, B. Poli, M. Sproston, A. Rollnik, S. Orito, S. Zylberajch, S. Sanghera, C. Wahl, M. F. Turner, H. Oh, O. Runolfsson, P. Lennert, J. M. Lorah, H. Yamashita, B. Lorazo, M. Z. Akrawy, Makoto Minowa, H. E. Stier, T. W. Pritchard, M. Weymann, M. W. Moss, W. Mohr, M. M.B. Lasota, P. S. Hinde, M. Regimbald, P. M. Hattersley, A. Possoz, H. Takeda, I. Wingerter, C. Beard, C. Ho, Marco Cuffiani, J. W. Gary, E. Heflin, S. Bethke, B. W. Kennedy, J. C. Hill, Misao Sasaki, M. J. Oreglia, N. I. Geddes, G. J. Barker, N. C. Wood, M. M. Deninno, R. J. Barlow, A. A. Carter, D. J. Miller, J. Schwarz, J. Kroll, M. Ogg, J. R. Carter, R. Yaari, J. Ma, W. J. Murray, L. Levinson, P. Jovanovic, S. Wotton, Austin Ball, F. K. Loebinger, F. X. Gentit, J. E. Conboy, A. C. McPherson, W. Schappert, M. S. Dixit, Alessandro Montanari, B. Nellen, J. Banks, G. Azuelos, H. Mes, A. Simon, S. W. Gensler, R. E. Hughes-Jones, A. Shapira, Aldo Michelini, E. Gross, Fabrizio Fabbri, D. Van den plas, G. Tysarczyk, O. Ganel, K. Riles, M. W. Redmond, S. Weisz, P. Farthouat, A. Pouladdej, G. Mikenberg, T. Kobayashi, R. K. Carnegie, O. Schaile, D. C. Imrie, J. Ludwig, C. P. Howarth, J. Grunhaus, Terry Richard Wyatt, F. G. Oakham, J. E. Pilcher, E. Duchovni, M. Hansroul, A. A. Macbeth, G. W. Wilson, P. W. Jeffreys, S. J. Pawley, G. Maringer, Claus Kleinwort, L. Köpke, Masatoshi Koshiba, J. Hart, M. Hauschild, D. E. Klem, Harold Nguyen, V. H. Winterer, P. Leblanc, R. J. Homer, L. Lessard, K. J. Anderson, Y. Yang, Achim Müller, O. Biebel, John Allison, C. Y. Chang, A. D. Schaile, Stephen Lloyd, R. G. Kellogg, B. Gandois, Mitsuaki Nozaki, M. Weber, Stefano Marcellini, K. Stephens, Masatoshi Imori, John Baines, G. Bavaria, F. Odorici, D. R. Ward, F. Lamarche, M. T. French, O. W. Davies, M. J. Losty, Richard J Hemingway, S. W. O'Neale, Peter R Hobson, A. T. Watson, Rene Brun, J. Hagemann, I. J. Bloodworth, James D Gillies, A. Perez, R. A. Sansum, G. M. Dallavalle, J. Goldberg, T. J. Smith, P. Mättig, C. M. Hawkes, Daniel Lellouch, Takehiko Mori, R. P. Middleton, D. Menszner, M. J. Goodrick, J. G. Layter, J. D. Hobbs, G. Alexander, G. Giacomelli, S. Dado, H. Hagedorn, Frans Meijers, K. Runge, B. Wuensch, and N. Wermes
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Standard Model (mathematical formulation), Basis (linear algebra), Electron–positron annihilation, Hadron, Particle Physics - Experiment, Lepton
Abstract: We report on a measurement of the processes e+e−→e+e−, e+e−→μ+μ−, and e+e−→τ+τ− near the Z0 pole. On the basis of 163 e+e−, 101 μ+μ− and 87 τ+τ− events we obtain Γee=89±4±4 MeV, Γμμ=85±9±6 MeV and Γττ=87±10±8 MeV, compatible with the standard model. Combining these with our previous results on hadronic Z0 decays, we find a hadronic width Γhad=1787±81±90 MeV and an invisible width Γinv=552±85±71 MeV.
Published: 1990

163. Transverse dynamics of Pb-Pb collisions at 40 A GeV/c viewed by strange hadrons

Author: M. Spyropoulou-Stassinaki, Franco Meddi, G. A. Feofilov, Leonid Vinogradov, K. Šafařík, M Bombara, A. Jusko, G.S. Pappalardo, A. Badalà, Trine Spedstad Tveter, P van de Ven, O. Villalobos Baillie, V. P. Kondratiev, J. Urban, E. Schillings, T. Virgili, V. Lenti, Ivan Kralik, R Romita, Håvard Helstrup, A. Jacholkowski, A.K. Holme, P.A. Bacon, J.B. Kinson, Paraskevi Ganoti, P.I. Norman, R. Lietava, G. T. Jones, P. G. Kuijer, R. Sené, Federico Antinori, P. Vande Vyvre, R. Turrisi, Janka Vrlakova, L. Šándor, K. Knudson, S. Di Liberto, M. Morando, B. Ghidini, M. A. Mazzoni, B. Pastirčák, A. Vascotto, D. Di Bari, D. Evans, Rocco Caliandro, Francesca Soramel, Wisla Carena, R. Kamermans, Roberto Barbera, M.F. Votruba, Andrea Dainese, W. Snoeys, Davide Elia, I. J. Bloodworth, Dieter Røhrich, S A Bull, R. Platt, Vito Manzari, G. Romano, Petr Zavada, Pavel Staroba, Roberto Divia, T. Vik, R. F. Clarke, A. Belogianni, E Quercigh, A. Palmeri, N Carrer, M. Sené, Kristin Fanebust Hetland, M. Campbell, Francesco Riggi, G. Grella, P. Jovanovic, Adela Kravcakova, Gunnar Løvhøiden, G.F. Segato, R. A. Fini, A. Michalon, Giuseppe Bruno, European Organization for Nuclear Research (CERN), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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), NA57, and Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Hadron, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Lambda, 01 natural sciences, Omega, Spectral line, Nuclear physics, Transverse plane, Cross section (physics), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Transverse mass, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Event (particle physics), Nuclear Physics
Abstract: The transverse mass spectra of K0s, Lambda, Xi and Omega particles produced in Pb-Pb collisions at 40 A GeV/c have been studied for a sample of events corresponding to the most central 53% of the inelastic Pb-Pb cross-section. We analyze the distributions in the framework of a parameterized model inspired by hydrodynamics. The dependence of the freeze-out parameters on particle species and event centrality is discussed and comparisons with results at higher energy are shown., Comment: submitted to Journal Of Physics G: Nuclear And Particle Physics
Published: 2006

164. Results from NA57

Author: L. Šándor, M. Morando, M. A. Mazzoni, A. Vascotto, B. Ghidini, Håvard Helstrup, Karel Safarik, A. Badalà, F. Soramel, R. Lietava, W. Snoeys, J. Urban, E. Schillings, G.S. Pappalardo, O. Villalobos Baillie, V. Lenti, V. P. Kondratiev, Trine Spedstad Tveter, Ivan Kralik, Pavel Staroba, Roberto Divia, G. Romano, I. J. Bloodworth, I. Vinogradov, J.B. Kinson, S. Di Liberto, P.I. Norman, G. T. Jones, Gunnar Løvhøiden, G. A. Feofilov, B. Pastirčák, Francesco Riggi, A. Jusko, G.F. Segato, P van de Ven, E. Quercigh, N. Carrer, R. Platt, Wisla Carena, Davide Elia, Dieter Røhrich, G. Grella, Giuseppe Bruno, D. Evans, P. G. Kuijer, D. Di Bari, Franco Meddi, Adela Kravcakova, Andrea Dainese, Vito Manzari, A. Palmeri, A. Jacholkowski, P.A. Bacon, Janka Vrlakova, K. Knudson, R. A. Fini, A.K. Holme, Tiziano Virgili, A. Michalon, Marek Bombara, M. Sené, Kristin Fanebust Hetland, R. Sené, R. Kamermans, Petr Zavada, M.F. Votruba, M. Campbell, M. Spyropoulou-Stassinaki, T. Vik, R. F. Clarke, S A Bull, A. Belogianni, Rocco Caliandro, Paraskevi Ganoti, P. Vande Vyvre, R. Turrisi, P. Jovanovic, R. Barbera, Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Tamás Csörgő, Gábor Dávid, Péter Lévai and Gábor Papp, and NA57
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, Hadron, High Energy Physics::Phenomenology, Nuclear Theory, Strangeness, 01 natural sciences, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Physics - Experiment, 010306 general physics, Nuclear Experiment
Abstract: The NA57 experiment has measured the production of strange and multi-strange hadrons in heavy-ion collisions at the CERN SPS. After briefly introducing the NA57 apparatus and analysis procedures, we present recent results on strangeness enhancement in Pb-Pb relative to $\textrm{p}$-Be collisions, on the study of the $m_{T}$ distributions of strange particles, and on central-to-peripheral nuclear modification factors in Pb-Pb collisions at top SPS energy. The NA57 experiment has measured the production of strange and multi-strange hadrons in heavy-ion collisions at the CERN SPS. After briefly introducing the NA57 apparatus and analysis procedures, we present recent results on strangeness enhancement in Pb-Pb relative to p-Be collisions, on the study of the m_T distributions of strange particles, and on central-to-peripheral nuclear modification factors in Pb-Pb collisions at top SPS energy. The NA57 experiment has measured the production of strange and multi-strange hadrons in heavy-ion collisions at the CERN SPS. After briefly introducing the NA57 apparatus and analysis procedures, we present recent results on strangeness enhancement in Pb+Pb relative to p+Be collisions, on the study of the m T distributions of strange particles, and on central-to-peripheral nuclear modification factors in Pb+Pb collisions at top SPS energy.
Published: 2005

165. Multiplicity of charged particles in Pb-Pb collisions at SPS energies

Author: G. Martinská, D. Di Bari, A.K. Holme, N. Pišútová, M. Morando, I. J. Bloodworth, A. Badalà, B. Ghidini, N. van Eijndhoven, N Carrer, Giuseppe Bruno, M. A. Mazzoni, F. Navach, Leonid Vinogradov, M. Sené, Kristin Fanebust Hetland, G. Romano, M. Campbell, E. Schillings, R. Platt, Anatoly Kolozhvari, G. Grella, T.A. Toulina, J. Urban, Gunnar Løvhøiden, Dieter Røhrich, A. Jacholkowski, Ivan Kralik, Vito Manzari, D. Evans, Janka Vrlakova, R. A. Fini, P. G. Kuijer, Karel Safarik, A. Michalon, Anju Bhasin, Franco Meddi, R. Kamermans, M.F. Votruba, G. A. Feofilov, W. Snoeys, A. van den Brink, M Bombara, G.F. Segato, A Jacholkowski, Pavel Staroba, Roberto Divia, A. Jusko, A. Belogianni, E Quercigh, E. Nappi, A. Palmeri, J.B. Kinson, P van de Ven, G.S. Pappalardo, O. Villalobos Baillie, V. P. Kondratiev, Håvard Helstrup, Petr Zavada, J. van Hunen, T. Vik, R. F. Clarke, Adela Kravcakova, P. Jovanovic, A. Vascotto, Tiziano Virgili, Trine Spedstad Tveter, Federico Antinori, S A Bull, Francesca Soramel, K. Knudson, P.I. Norman, G. T. Jones, A.P. de Haas, F. Posa, Roman Lietava, Francesco Riggi, Davide Elia, F.F. Valiev, S. Di Liberto, Rocco Caliandro, B. Pastirčák, M. Spyropoulou-Stassinaki, Roberto Barbera, Andrea Dainese, P. Vande Vyvre, R. Turrisi, J. Pišút, P.A. Bacon, V. Lenti, Paraskevi Ganoti, P.C. de Rijke, L Síndor, Wisla Carena, Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), NA57, Institut de Recherches Subatomiques (IReS), and 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)
Subjects: History, Nuclear and High Energy Physics, Particle physics, FOS: Physical sciences, Venus, 01 natural sciences, 7. Clean energy, Education, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Rapidity, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics, Physics, Large Hadron Collider, biology, 010308 nuclear & particles physics, biology.organism_classification, Charged particle, Computer Science Applications, High Energy Physics::Experiment, Nucleon, Particle Physics - Experiment
Abstract: The multiplicity of charged particles in the central rapidity region has been measured by the NA57 experiment in Pb--Pb collisions at the CERN SPS at two beam momenta: 158 A GeV/{\it c} and 40 A GeV/{\it c}. The value of $dN_{ch}/d\eta$ at the maximum has been determined and its behaviour as a function of centrality has been studied in the centrality range covered by NA57 (about 50% of the inelastic cross section). The multiplicity increases approximately logarithmically with the centre of mass energy., Comment: 19 pages, 8 figures
Published: 2005

166. Λ and Ω− Polarization in Pb+Pb Collisions at 160 A GeV/c

Author: Pavel Staroba, Roberto Divia, N. Carrer, G.F. Segato, Rosario Turrisi, P.A. Bacon, M. Morando, M. Bombara, E. Quercigh, V. Lenti, G. S. Pappalardo, P. G. Kuijer, G. Romano, A. Belogianni, Adela Kravcakova, Angela Badala, Kristin Fanebust Hetland, P. Jovanovic, Domenico Di Bari, T. Vik, A.K. Holme, R. F. Clarke, S. Di Liberto, B. Pastirčák, Franco Meddi, Leonid Vinogradov, R. Platt, M. Sene, J. Urban, I. J. Bloodworth, Giacomo Bruno, M. A. Mazzoni, A. Vascotto, B. Ghidini, G. A. Feofilov, E. Schillings, Vito Manzari, A. Palmeri, Tiziano Virgili, R. A. Fini, F. Soramel, Francesco Riggi, A. Michalon, P. Vande Vyvre, Trine Spedstad Tveter, Petr Zavada, S A Bull, Andrea Dainese, R. Lietava, G. Grella, R. Sené, Roberto Barbera, K. Knudson, A. Jacholkowski, O. Villalobos Baillie, V. P. Kondratiev, P.I. Norman, G. T. Jones, Federico Antinori, L. Sandor, Dieter Røhrich, Haavard Helstrup, J.B. Kinson, Gunnar Løvhøiden, Janka Vrlakova, Karel Safarik, W. Snoeys, D. Elia, R. Kamermans, M.F. Votruba, Wisla Carena, Rocco Caliandro, D. Evans, M. Campbell, Paraskevi Ganoti, P van de Ven, M. Spyropoulou-Stassinaki, Anton Jusko, and Ivan Kralik
Subjects: Nuclear physics, Physics, Transverse plane, 0202 electrical engineering, electronic engineering, information engineering, High Energy Physics::Experiment, 020206 networking & telecommunications, 020201 artificial intelligence & image processing, 02 engineering and technology, Nuclear Experiment, Polarization (waves)
Abstract: We study the transverse polarization of Λ’s and Ω−’s produced in Pb + Pb interaction at 160 A GeV/c. We also present a study of the longitudinal polarization of Λ’s produced in the weak decays of Ξ’s.
Published: 2005

167. Search for pentaquarks in WA97 experiment at CERN

Author: K. Fanebust, M. Henriquez, N. Carrer, Pavel Staroba, Giacomo Bruno, R. A. Loconsole, Vito Manzari, Rocco Caliandro, G. Grella, J. Urban, K. Knudson, Franco Meddi, T. Vik, G.F. Segato, E. Quercigh, M. A. Mazzoni, B. Ghidini, L. Sandor, Haavard Helstrup, S. Di Liberto, W. Beusch, Tiziano Virgili, B. Pastirčák, V. Lenti, M.E. Michalon-Mentzer, P.I. Norman, M. Morando, G. T. Jones, Federico Antinori, F. Fayazzadeh, R. A. Fini, A. Michalon, A.K. Holme, D. Di Bari, Michael A. Thompson, R. Závada, D. Evans, A. Jacholkowski, D. Elia, Ivan Kralik, G. Løvhøden, G. Romano, I. J. Bloodworth, K. Šafařík, Dieter Røhrich, M.F. Votruba, R. Lietava, O. Villalobos Baillie, J.B. Kinson, 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), and WA97
Subjects: Physics, Particle physics, Large Hadron Collider, Reference data (financial markets), Strangeness production, 020206 networking & telecommunications, 02 engineering and technology, Pentaquark, Nuclear physics, 0202 electrical engineering, electronic engineering, information engineering, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 020201 artificial intelligence & image processing, Heavy ion, High Energy Physics::Experiment, Nuclear Experiment
Abstract: The WA97 experiment at CERN has collected data aiming to study strangeness production in heavy ion collisions at 158 A GeV/c; p‐Be data were also taken as reference data. Here we show some results of an analysis of these p‐Be data in order to check for evidence of a recently claimed pentaquark state.
Published: 2004

168. Hyperon production at the CERN SPS: results from the NA57 experiment

Author: T.A. Toulina, Anju Bhasin, G. A. Feofilov, A. Belogianni, G.S. Pappalardo, O. Villalobos Baillie, A. Palmeri, V. P. Kondratiev, T. Vik, Anatoly Kolozhvari, Trine Spedstad Tveter, R. F. Clarke, F. Soramel, Gunnar Løvhøiden, Rosario Turrisi, K. Knudson, M. Spyropoulou-Stassinaki, N Carrer, Roberto Barbera, R. A. Fini, A.K. Holme, N. Pišútová, A. Michalon, F. Navach, A. Badalà, P.I. Norman, G. T. Jones, M. Morando, Haavard Helstrup, G. Grella, Francesco Riggi, D. Di Bari, B. Ghidini, D. Evans, F. Posa, Roman Lietava, Petr Zavada, Pavel Staroba, Federico Antinori, S. Di Liberto, P. Jovanovic, K. Fanebust, Wisla Carena, B. Pastirčák, Roberto Divia, G.F. Segato, Rocco Caliandro, Leonid Vinogradov, N. van Eijndhoven, E. Quercigh, Ivan Kralik, A.P. de Haas, E. Schillings, P.A. Bacon, M. A. Mazzoni, Franco Meddi, Adela Kravcakova, E. Nappi, Paraskevi Ganoti, Davide Elia, P.C. de Rijke, A. van den Brink, Janka Vrlakova, P. G. Kuijer, A. Jacholkowski, W. Snoeys, L. Šándor, Tiziano Virgili, F. Fayazzadeh, Andrea Dainese, J.B. Kinson, M. Sené, A. Vascotto, M. Campbell, F.F. Valiev, J. Urban, G. Romano, M. Henriquez, J. van Hunen, G Martinská, P. Vande Vyvre, S A Bull, R. Sené, J. Pišút, V. Lenti, Vito Manzari, I. J. Bloodworth, Giuseppe Bruno, Dieter Røhrich, R. Kamermans, M.F. Votruba, K. Šafařík, M Bombara, A. Jusko, and P van de Ven
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Nuclear Theory, Hadron, Hyperon, Elementary particle, Xi baryon, Nuclear physics, Baryon, Antimatter, High Energy Physics::Experiment, Nuclear Experiment, Nucleon
Abstract: New results on strange baryon and antibaryon production in Pb-Pb collisions at 40 and 160 GeV per nucleon are presented. In particular, we have increased significantly the statistics of the Ξ - and Ξ + samples at 160 GeV per nucleon. The dependence of particle yields and spectra on collision centrality and energy of interaction is analysed.
Published: 2004

169. Hyperon production in 40 A GeV/c collisions from the NA57 experiment

Author: Anju Bhasin, G. A. Feofilov, M. Henriquez, P. Vande Vyvre, R. Turrisi, L. Šándor, J. Urban, J. Pišút, Roberto Barbera, F. Navach, A. Vascotto, Haavard Helstrup, J. van Hunen, A. Badalà, K. Knudson, Francesca Soramel, F. Posa, Roman Lietava, Vito Manzari, G.S. Pappalardo, Anatoly Kolozhvari, O. Villalobos Baillie, V. P. Kondratiev, T. Vik, Gunnar Løvhøiden, R. F. Clarke, Petr Zavada, A. van den Brink, Davide Elia, Rocco Caliandro, I. J. Bloodworth, D. Evans, Ivan Kralik, Trine Spedstad Tveter, S. Di Liberto, B. Pastirčák, P. G. Kuijer, R. A. Fini, Pavel Staroba, R. Sené, J. Fedorisin, Adela Kravcakova, A. Michalon, N Carrer, A. Belogianni, M. A. Mazzoni, Francesco Riggi, P.I. Norman, G. T. Jones, Roberto Divia, P.C. de Rijke, G.F. Segato, E Quercigh, M. Morando, Dieter Røhrich, P. Jovanovic, K. Fanebust, G. Grella, A. Palmeri, B. Ghidini, Leonid Vinogradov, Paraskevi Ganoti, E. Nappi, Wisla Carena, J.B. Kinson, F.F. Valiev, M. Sené, V. Lenti, R. Kamermans, M.F. Votruba, M. Campbell, E. Schillings, Federico Antinori, G Martinská, S A Bull, M. Spyropoulou-Stassinaki, A.P. de Haas, G. Romano, Franco Meddi, Tiziano Virgili, A.K. Holme, N. Pišútová, A. Jusko, P van de Ven, Giuseppe Bruno, D. Di Bari, Karel Safarik, A. Jacholkowski, W. Snoeys, T.A. Toulina, F. Fayazzadeh, Janka Vrlakova, N. van Eijndhoven, and Andrea Dainese
Subjects: Baryon, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Nuclear Theory, Hyperon, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Enhancements of strange baryon and anti-baryon yields were first observed in Pb–Pb interactions at 160 A GeV/c by WA97. The aim of the NA57 experiment is to investigate how these enhancements behave as a function of energy, and over a broader centrality range than that which was available with WA97. This paper presents a comparison of the hyperon yields in Pb–Pb interactions at 40 A GeV/c and 160 A GeV/c. Preliminary signals for the p-Be data at 40 A GeV/c are also shown.
Published: 2004

170. Hyperon production in lead-lead interactions at 40 and 160 A GeV/c

Author: T. Vik, R. F. Clarke, N Carrer, Francesco Riggi, G. Grella, A. Badalà, L. Šándor, R. Kamermans, G.S. Pappalardo, M.F. Votruba, Giuseppe Bruno, V. Lenti, A. Vascotto, A. Belogianni, O. Villalobos Baillie, V. P. Kondratiev, E Quercigh, Franco Meddi, Francesca Soramel, M. Sené, M. Campbell, E. Nappi, I. J. Bloodworth, P.A. Bacon, F.F. Valiev, A. Palmeri, Anju Bhasin, Anatoly Kolozhvari, J. Urban, A. van den Brink, G. A. Feofilov, A.K. Holme, Davide Elia, Leonid Vinogradov, M. A. Mazzoni, S A Bull, Dieter Røhrich, D. Evans, K. Šafařík, Trine Spedstad Tveter, R. Sené, M Bombara, N. van Eijndhoven, G Martinská, Ivan Kralik, N. Pišútová, Tiziano Virgili, E. Schillings, A. Jusko, F. Navach, P van de Ven, P.I. Norman, G. T. Jones, P.C. de Rijke, Andrea Dainese, Wisla Carena, M. Spyropoulou-Stassinaki, Petr Zavada, Pavel Staroba, Roberto Divia, J. van Hunen, T.A. Toulina, Federico Antinori, J.B. Kinson, Rocco Caliandro, A.P. de Haas, Vito Manzari, G. Romano, M. Morando, B. Ghidini, P. Vande Vyvre, R. Turrisi, P. G. Kuijer, J. Pišút, Janka Vrlakova, K. Knudson, D. Di Bari, Haavard Helstrup, A. Jacholkowski, G.F. Segato, W. Snoeys, F. Posa, Roman Lietava, P. Jovanovic, K. Fanebust, Adela Kravcakova, Gunnar Løvhøiden, R. A. Fini, A. Michalon, Roberto Barbera, S. Di Liberto, B. Pastirčák, Paraskevi Ganoti, 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), and NA57
Subjects: Physics, Physics and Astronomy (miscellaneous), Nuclear Theory, Hadron, Hyperon, Elementary particle, Fermion, Strangeness, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Baryon, Nuclear physics, Antimatter, Transverse mass, Nuclear Experiment, Engineering (miscellaneous)
Abstract: The NA57 experiment has measured strange baryon and antibaryon production in Pb-Pb collisions at 40 A GeV/c and 160 A GeV/c beam momenta. This presentation covers strangeness enhancement and transverse spectra from the 160 A GeV/c data, and energy dependence of the particle yields. Enhancement factors increase with increasing strangeness content of the particle, when production yields from Pb-Pb collisions are compared with those observed in p-Be and p-Pb interactions. The transverse mass spectra have been analysed both with exponential fits and using a transverse flow model.
Published: 2003

171. Results on 40 A GeV/c PbPb collisions from the NA57 experiment

Author: F.F. Valiev, G Martinská, M. Spyropoulou-Stassinaki, N. Carrer, F. Navach, S. Di Liberto, J. Urban, Ivan Kralik, Haavard Helstrup, A. Jacholkowski, Anju Bhasin, G. A. Feofilov, M. A. Mazzoni, R. Kamermans, M.F. Votruba, T. Vik, P. G. Kuijer, W. Snoeys, Roman Lietava, R. F. Clarke, P.C. de Rijke, V. Lenti, Roberto Barbera, A. Jusko, F. Fayazzadeh, P van de Ven, Andrea Dainese, M. Morando, Francesca Soramel, A.K. Holme, B. Ghidini, Trine Spedstad Tveter, A. Palmeri, M. Henriquez, A. Belogianni, E Quercigh, D. Elia, K. Knudson, Giacomo Bruno, P.I. Norman, G. T. Jones, T.A. Toulina, David H. Evans, Vito Manzari, I. J. Bloodworth, L. Sˇándor, N. Pisˇútova, Federico Antinori, R. Sené, Francesco Riggi, S A Bull, E. Nappi, Paraskevi Ganoti, J. Fedorisˇin, J. Pisˇút, N. van Eijndhoven, G. Grella, M. Sené, M. Campbell, A. Vascotto, K. Sˇafarˇík, A. van den Brink, G.S. Pappalardo, Leonid Vinogradov, O. Villalobos Baillie, V. P. Kondratiev, Pavel Staroba, F. Posa, Dieter Røhrich, Roberto Divia, E. Schillings, A.P. de Haas, B. Pastircˇák, G. Romano, A. Kravcˇáková, A.A. Kolozhavari, Franco Meddi, J.B. Kinson, J. van Hunen, Tiziano Virgili, Janka Vrlakova, P. Jovanovic, K. Fanebust, Petr Zavada, R. A. Fini, A. Michalon, G.F. Segato, Angela Badala, P. Vande Vyrvre, Gunnar Løvhøiden, Wisla Carena, D. Di Bari, R. Turrisi, and Rocco Caliandro
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Nuclear Theory, Hyperon, Hyperons, Strangeness, Nuclear physics, Baryon, High Energy Physics::Experiment, Quark Gluon Plasma, Nuclear Experiment, Beam energy
Abstract: The NA57 experiment has been designed to study the onset of the strange baryon and antibaryon enhancements in Pb Pb with respect to p-Be collisions, first observed by WA97 at 160 A GeV/ c . NA57 has extended the WA97 measurements to investigate the evolution of strangeness enhancement over a wider centrality range and as a function of the beam energy. Results on hyperon production in central Pb Pb collisions at 40 A GeV/ c are presented and compared with those obtained at higher energy, in the same centrality range.
Published: 2003

172. Inclusive analysis of the b quark fragmentationfunction in Z decays at LEP

Author: Dave Charlton, R. D. Heuer, Gideon Bella, H. J. Burckhart, W. Menges, Silvia Arcelli, H. Landsman, Richard Teuscher, M. A. Thomson, Gunter Wolf, S. Yamashita, E. K. U. Gross, K. Stephens, P. F. Åkesson, D. Zer-Zion, N. Kanaya, N. K. Watson, L. L. Kormos, A. J. Martin, James Pinfold, R. Seuster, Gianni Masetti, C. Y. Chang, G. Gaycken, M. Gruwé, M. Schumacher, E. L. Barberio, S. Moed, A. Csilling, D. E. Plane, Paul Kyberd, F. K. Loebinger, Ivor Fleck, P. Igo-Kemenes, K. Ishii, H. Jeremie, Joleen Pater, Edward K. G. Sarkisyan, Daniel Lellouch, Takehiko Mori, A. Okpara, V. Zacek, C. Ainsley, A. D. Schaile, E. A. De Wolf, Gabriella Pasztor, P. Vannerem, A. Klier, Norbert Wermes, T. Kawamoto, A. Mutter, C. Hensel, C. Pahl, Richard Nisius, Balazs Ujvari, Alexander Oh, H. A. Neal, O. Schaile, J. M. Roney, H. Voss, G. M. Dallavalle, P. Tran, Georges Azuelos, B. Vachon, Marco Cuffiani, E. Tsur, C. M. Hawkes, D. J. Miller, T. Behnke, P. Scharff-Hansen, Koichi Nagai, P. Amaral, Richard J. K. Taylor, C. P. Ward, S. Orito, O. Sahr, Raimund Ströhmer, W. Mohr, D. Lanske, Erez Etzion, Isabel Marian Trigger, K. W. Bell, W. Mader, J. Cammin, G. Giacomelli, A. Tricoli, S. Spagnolo, D. R. Rust, S. Söldner-Rembold, K. Harder, Stefan Kluth, K. Hoffman, P. J. Bell, A. Leins, Oliver Pooth, Shlomit Tarem, John Allison, Alain Bellerive, A. De Roeck, M. Kobel, A. M. Smith, Arnulf Quadt, Matthias Schröder, J. C. Hill, P. Gagnon, R. J. Hemingway, B. Poli, J. Lillich, H. Mes, R. M. Brown, D. R. Ward, Guenter Duckeck, I. P. Duerdoth, P. Ferrari, J. Grunhaus, P. M. Watkins, Lorne Levinson, Tobias Kramer, W. J. McDonald, B. C. Shen, S. Braibant, M. Giunta, Andris Skuja, B. W. Kennedy, P. Jovanovic, J. Letts, P. Mättig, Shoji Asai, Achim Stahl, I. R. Bailey, R. G. Kellogg, Tetsuro Mashimo, M. F. Turner-Watson, Peter Krieger, Zoltan Laszlo Trocsanyi, Dong Hee Kim, I. J. Bloodworth, Roger Barlow, O. Biebel, Klaus Rabbertz, Frans Meijers, Csaba Hajdu, J. Goldberg, M. Donkers, Siegfried Bethke, A. Macpherson, Kiyotomo Kawagoe, P. Hüntemeyer, Christoph Geich-Gimbel, P. Renkel, Stefano Marcellini, M. Kupper, Stephen Lloyd, M. J. Oreglia, C. H. Shepherd-Themistocleous, S. Campana, W. G. Scott, Sachio Komamiya, I. Nakamura, R. J. Batley, Yoram Rozen, D. Axen, Oana Elena Vickey Boeriu, E. Torrence, A. Gupta, Tara Shears, T. Trefzger, J. G. Layter, F. Spano, S.J. Dallison, Peter Sherwood, J. W. Gary, Thomas E Marchant, T. P. Kokott, D. Waller, L. Zivkovic, I. Cohen, Junichi Kanzaki, Robert McPherson, J. Polok, George Lafferty, T. Saeki, Gordon H. Hanson, Christoph Rembser, D. Karlen, J. Ludwig, J. R. Carter, K. Buesser, Thomas Schoerner-Sadenius, Satoshi Mihara, K. Runge, P. Bock, Katja Klein, M. Ford, P. Mendez-Lorenzo, G. N. Patrick, L. Brigliadori, Marek Tasevsky, Fabrizio Fabbri, A. Frey, K. Sachs, Shlomo Dado, Frank Fiedler, Paolo Giacomelli, Dezso Horvath, R. Kowalewski, G. P. Siroli, Christoph Schwick, Vakhtang Kartvelishvili, M. Harin-Dirac, Philip Bechtle, R. J. Homer, A. Fürtjes, Lutz Feld, J. Hauschildt, M. Boutemeur, F. S. Merritt, S. W. O'Neale, P. O. Günther, J. P. Martin, J. A. McKenna, Gideon Alexander, D. Toya, K. J. Anderson, C. F. Vollmer, Giora Mikenberg, Jochen Schieck, Ehud Duchovni, G. Anagnostou, A. Michelini, T. Kobayashi, Gregor Herten, S. Rosati, E. Elfgren, A. Harel, Ikuo Ueda, D. M. Strom, J. Lu, H. Rick, M. Hamann, Richard Keeler, R. J. Sobie, Joost Vossebeld, Klaus Desch, R. Howard, J. E. Pilcher, T. R. Junk, P. S. Wells, Terry Richard Wyatt, A. T. Watson, G. W. Wilson, M. Hauschild, Thorsten Wengler, B. Caron, Gabriele Benelli, M. Przybycień, T. Kress, A. A. Carter, M. Verzocchi, Giovanni Abbiendi, Daniele Bonacorsi, D. Krop, J. von Krogh, R. J. Hawkings, D. Wetterling, T. J. McMahon, J. Dubbert, R. K. Carnegie, J. A. Wilson, G. Karapetian, and OPAL Collaboration
Subjects: Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Meson, 010308 nuclear & particles physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Theoretical models, FOS: Physical sciences, 01 natural sciences, Bottom quark, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Fragmentation function, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: A study of b quark hadronisation is presented using inclusively reconstructed B hadrons in about four million hadronic Z decays recorded in 1992-2000 with the OPAL detector at LEP. The data are compared to different theoretical models, and fragmentation function parameters of these models are fitted. The average scaled energy of weakly decaying B hadrons is determined to be =0.7193+-0.0016(stat)+0.0036-0.0031(syst), Comment: 26 pages, 8 figures
Published: 2003

173. Measurement of the Cross-Section for the Process GammaGamma -> Ppbar at sqrt(s)_ee=183-189 GeV at LEP

Author: Daniel Lellouch, P. Scharff-Hansen, Takehiko Mori, A. Okpara, A. M. Smith, James Pinfold, R. Seuster, R. K. Keeler, A. Tricoli, Arnulf Quadt, P. M. Watkins, P. Renkel, Silvia Arcelli, B. Poli, P. Mättig, Shoji Asai, A. Csilling, I. J. Bloodworth, B. Vachon, C. Pahl, G. D. Lafferty, Andris Skuja, Tetsuro Mashimo, M. F. Turner-Watson, Yoram Rozen, Tara Shears, Gianni Masetti, C. Y. Chang, A. Macpherson, N. K. Watson, T. R. Junk, Junichi Kanzaki, J. Polok, S. Yamashita, P. Igo-Kemenes, M. Kupper, D. Karlen, P. S. Wells, G. Gaycken, W. Menges, Otmar Biebel, K. Buesser, S. Moed, Georges Azuelos, C. Ainsley, M. Schumacher, E. Torrence, A. Gupta, P. J. Bell, E. Tsur, C. M. Hawkes, Terry Richard Wyatt, A. T. Watson, R. J. Hemingway, K. Ishii, H. Jeremie, M. A. Thomson, Thorsten Wengler, Isabel Marian Trigger, K. W. Bell, E. K. U. Gross, B. Caron, J. Lillich, A. D. Schaile, Richard J. K. Taylor, Gabriella Pasztor, Alexander Oh, E. A. De Wolf, Thomas E Marchant, M. Hamann, L. Brigliadori, P. Vannerem, J. C. Hill, Tobias Kramer, B. W. Kennedy, D. E. Plane, M. Boutemeur, F. S. Merritt, D. Axen, Dave Charlton, Erez Etzion, P. Jovanovic, P. Amaral, Oana Elena Vickey Boeriu, J. Grunhaus, T. Barillari, G. M. Dallavalle, S. W. O'Neale, P. Tran, R. Kowalewski, F. Spano, W. J. McDonald, Peter Sherwood, B. C. Shen, Matthias Schröder, P. O. Günther, Kiyotomo Kawagoe, K. Sachs, Philip Bechtle, O. Schaile, Peter Krieger, R. J. Sobie, Stefan Kluth, Joost Vossebeld, C. P. Ward, Shlomit Tarem, D. Lanske, M. Donkers, H. Mes, I. P. Duerdoth, Siegfried Bethke, J. Ludwig, W. G. Scott, Daniele Bonacorsi, I. Nakamura, K. Runge, J. A. McKenna, P. Bock, H. Voss, K. J. Anderson, S. Braibant, Klaus Desch, R. D. Heuer, J. M. Roney, Gideon Alexander, Norbert Wermes, Satoshi Mihara, Gideon Bella, Katja Klein, M. Przybycieá, M. Giunta, J. W. Gary, P. F. Åkesson, Raimund Ströhmer, R. Howard, S. Söldner-Rembold, T. Trefzger, P. Hüntemeyer, T. Kawamoto, D. Krop, H. J. Burckhart, C. F. Vollmer, P. Mendez-Lorenzo, Marek Tasevsky, Dezso Horvath, J. Letts, A. Mutter, Koichi Nagai, R. J. Batley, M. Gruwé, Graham Wilson, Jochen Schieck, C. Hensel, K. Harder, Christoph Geich-Gimbel, L. L. Kormos, S. Orito, S. Rosati, E. Elfgren, J. von Krogh, Beatrix Dienes, Klaus Rabbertz, Shlomo Dado, A. Harel, Sachio Komamiya, Gunter Wolf, T. Behnke, K. Hoffman, A. Leins, Stephen Lloyd, A. J. Martin, Vakhtang Kartvelishvili, D. J. Miller, S. Spagnolo, R. J. Barlow, Richard Nisius, W. Mohr, Frank Fiedler, G. Giacomelli, A. De Roeck, M. Kobel, R. J. Hawkings, Ikuo Ueda, D. M. Strom, A. Fürtjes, Marco Cuffiani, P. Gagnon, D. Wetterling, D. Toya, D. Waller, K. Kruger, R. M. Brown, J. Lu, T. Saeki, Ehud Duchovni, Lutz Feld, H. Landsman, Zoltan Laszlo Trocsanyi, Giora Mikenberg, H. Rick, Lorne Levinson, J. Hauschildt, W. Mader, Dong Hee Kim, M. J. Oreglia, A. Michelini, I. R. Bailey, T. Kress, T. Kobayashi, G. P. Siroli, E. L. Barberio, A. A. Carter, S.J. Dallison, L. Zivkovic, Frans Meijers, J. R. Carter, M. Verzocchi, G. N. Patrick, Giovanni Abbiendi, Christoph Schwick, J. Goldberg, C. H. Shepherd-Themistocleous, T. J. McMahon, J. Dubbert, R. K. Carnegie, J. A. Wilson, K. Stephens, N. Kanaya, Robert McPherson, G. Karapetian, Christoph Rembser, Thomas Schoerner-Sadenius, D. R. Ward, Pamela Ferrari, J. G. Layter, Fabrizio Fabbri, A. Frey, J. P. Martin, Alain Bellerive, G. Anagnostou, Achim Stahl, Oliver Pooth, John Allison, Paolo Giacomelli, Gabriele Benelli, M. Hauschild, Gregor Herten, J. E. Pilcher, M. Harin-Dirac, R. J. Homer, R. G. Kellogg, Csaba Hajdu, Stefano Marcellini, O. Sahr, D. Zer-Zion, F. K. Loebinger, Ivor Fleck, Joleen Pater, Edward K. G. Sarkisyan, A. Klier, Balazs Ujvari, H. A. Neal, Gordon H. Hanson, M. Ford, S. Campana, Guenter Duckeck, Richard Teuscher, and OPAL Collaboration
Subjects: Physics, Particle physics, Photon, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, 0103 physical sciences, Invariant mass, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: The exclusive production of proton-antiproton pairs in the collisions of two quasi-real photons had been studied using data taken at sqrt(s)_ee=183 GeV and 189 GeV with the OPAL detector at LEP. Results are presented for Ppbar invariant masses, W, in the range 2.15 W<, Comment: 21 pages, 5 figures
Published: 2002

174. Search for Charged Excited Leptons in e+e- Collisions at sqrt(s) = 183-209 GeV

Author: Gideon Bella, H. J. Burckhart, P. F. Åkesson, Silvia Arcelli, A. D. Schaile, Gabriella Pasztor, P. Vannerem, B. Vachon, T. R. Junk, C. Hensel, P. S. Wells, S. Campana, C. P. Ward, S. Söldner-Rembold, A. T. Watson, H. Mes, Georges Azuelos, Richard Teuscher, E. Tsur, C. M. Hawkes, M. Hauschild, I. P. Duerdoth, S. Braibant, M. Przybycień, A. Csilling, T. Behnke, S. Rosati, Isabel Marian Trigger, K. W. Bell, T. Kress, A. A. Carter, H. Voss, Dave Charlton, C. Pahl, G. D. Lafferty, E. Elfgren, A. Harel, J. Letts, M. J. Oreglia, Matthias Schröder, Kiyotomo Kawagoe, J. C. Hill, J. Goldberg, Shoji Asai, Tobias Kramer, P. Hüntemeyer, L. Brigliadori, W. J. McDonald, D. Axen, Ikuo Ueda, D. M. Strom, James Pinfold, J. Lu, B. C. Shen, M. Donkers, Siegfried Bethke, I. J. Bloodworth, M. Verzocchi, Oana Elena Vickey Boeriu, Giovanni Abbiendi, H. Rick, Shlomo Dado, R. D. Heuer, S. Yamashita, S.J. Dallison, L. Zivkovic, R. K. Keeler, A. Tricoli, T. Trefzger, W. G. Scott, I. Nakamura, G. Giacomelli, Guenter Duckeck, P. Igo-Kemenes, Daniele Bonacorsi, F. Spano, Peter Sherwood, G. N. Patrick, J. W. Gary, V. Zacek, Arnulf Quadt, G. Gaycken, H. Landsman, M. Boutemeur, F. S. Merritt, S. W. O'Neale, A. De Roeck, M. Kobel, D. Krop, W. Menges, Tara Shears, D. Toya, Yoram Rozen, P. M. Watkins, J. Ludwig, K. Ishii, H. Jeremie, P. Mendez-Lorenzo, P. Mättig, M. Hamann, M. Schumacher, Frans Meijers, I. Cohen, P. O. Günther, Christoph Rembser, Giora Mikenberg, Gregor Herten, K. Runge, P. Bock, Marek Tasevsky, Dezso Horvath, P. Renkel, A. Macpherson, J. von Krogh, C. F. Vollmer, Andris Skuja, Gunter Wolf, T. R. Wyatt, E. A. De Wolf, K. Hoffman, R. J. Hawkings, Jochen Schieck, G. W. Wilson, Junichi Kanzaki, J. Polok, D. Wetterling, Tetsuro Mashimo, M. F. Turner-Watson, A. Leins, R. J. Sobie, D. Karlen, Balazs Ujvari, K. J. Anderson, J. E. Pilcher, E. L. Barberio, P. Amaral, J. P. Martin, P. J. Bell, L. L. Kormos, T. J. McMahon, Thorsten Wengler, P. Gagnon, Joost Vossebeld, Norbert Wermes, Alain Bellerive, O. Schaile, Klaus Desch, T. Kawamoto, R. J. Barlow, A. J. Martin, M. Kupper, J. Dubbert, R. K. Carnegie, Daniel Lellouch, R. Howard, B. Caron, Gianni Masetti, J. Allison, Takehiko Mori, J. A. Wilson, A. Okpara, W. Mader, S. Orito, Zoltan Laszlo Trocsanyi, C. Y. Chang, Thomas E Marchant, Dong Hee Kim, G. Karapetian, Gabriele Benelli, G. Anagnostou, J. A. McKenna, P. Scharff-Hansen, Paolo Giacomelli, D. J. Miller, Richard J. K. Taylor, G. P. Siroli, Erez Etzion, S. Moed, S. Spagnolo, Stefan Kluth, Shlomit Tarem, A. M. Smith, R. J. Hemingway, M. Harin-Dirac, Christoph Schwick, J. Lillich, B. W. Kennedy, M. Giunta, P. Jovanovic, M. Gruwé, Peter Krieger, C. H. Shepherd-Themistocleous, Richard Nisius, R. J. Homer, Marco Cuffiani, M. Ford, Christoph Geich-Gimbel, Alexander Oh, M. A. Thomson, D. Lanske, K. Stephens, A. Fürtjes, O. Sahr, N. Kanaya, Lutz Feld, J. Hauschildt, Achim Stahl, E. K. U. Gross, D. R. Ward, J. M. Roney, Koichi Nagai, Satoshi Mihara, Katja Klein, W. Mohr, Klaus Rabbertz, Frank Fiedler, Stephen Lloyd, P. Ferrari, R. Kowalewski, Gideon Alexander, Richard Batley, Ehud Duchovni, A. Michelini, D. E. Plane, T. Kobayashi, G. M. Dallavalle, P. Tran, K. Buesser, J. Cammin, K. Harder, Sachio Komamiya, R. M. Brown, Lorne Levinson, I. R. Bailey, O. Biebel, T. P. Kokott, D. Waller, T. Saeki, D. Zer-Zion, E. Torrence, Paul Kyberd, A. Gupta, F. K. Loebinger, Ivor Fleck, Joleen Pater, Edward K. G. Sarkisyan, A. Klier, H. A. Neal, B. Poli, J. Grunhaus, N. K. Watson, C. Ainsley, V. Kartvelishvili, A. Mutter, K. Sachs, J. R. Carter, Philip Bechtle, Gordon H. Hanson, Rolf Seuster, Oliver Pooth, R. G. Kellogg, Csaba Hajdu, Stefano Marcellini, D. R. Rust, Robert McPherson, Thomas Schoerner-Sadenius, Fabrizio Fabbri, A. Frey, J. G. Layter, Raimund Ströhmer, and OPAL Collaboration
Subjects: Physics, Coupling constant, Nuclear and High Energy Physics, Particle physics, Muon, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, High Energy Physics::Phenomenology, FOS: Physical sciences, Fermion, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pair production, Excited state, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment, Lepton
Abstract: A search for charged excited leptons decaying into a lepton and photon has been performed using approximately 680 pb-1 of e+e- collision data collected by the OPAL detector at LEP at centre-of-mass energies between 183 GeV and 209 GeV. No evidence for their existence was found. Upper limits on the product of the cross-section and the branching fraction are inferred. Using results from the search for singly produced excited leptons, upper limits on the ratio of the excited lepton coupling constant to the compositeness scale are calculated. From pair production searches, 95% confidence level lower limits on the masses of excited electrons, muons and taus are determined to be 103.2 GeV., Comment: 18 pages, 4 figures. Typos corrected
Published: 2002
Full Text: View/download PDF

175. Strange Baryon Production from the NA57 Experiment at the CERN SPS

Author: F.F. Valiev, J. Urban, Federico Antinori, I. J. Bloodworth, Anju Bhasin, M. A. Mazzoni, Anton Jusko, Ivan Kralik, B. Ghidini, G. A. Feofilov, K. Fanebust, R. A. Fini, A.P. de Haas, A. Michalon, F. Navach, P. Vande Vyvre, Dieter Røhrich, Giuseppe Bruno, Rocco Caliandro, M. Luptak, M. Campbell, J. Pišút, P.C. de Rijke, G.F. Segato, E. Quercigh, Angela Badala, G. Romano, T. Vik, R. F. Clarke, O. Villalobos Baillie, V. P. Kondratiev, A.K. Holme, F. Fayazzadeh, Franco Meddi, K. Šafařík, G. Martinská, J. Ftacnik, Andrea Dainese, A. Kolojvari, N. Carrer, Rosario Turrisi, Trine Spedstad Tveter, R. Kamermans, M.F. Votruba, S A Bull, T.A. Toulina, D. Muigg, E. Nappi, M. Sené, K. Knudson, V. Lenti, A. Belogianni, Tiziano Virgili, A. Jacholkowski, N. Pisutova, M. Morando, vho, Leonid Vinogradov, M. Spyropoulou-Stassinaki, Petr Zavada, G. Lo, N. van Eijndhoven, F. Posa, P.I. Norman, G. T. Jones, Pavel Staroba, L. Sandor, Haavard Helstrup, P. van den Ven, E. Schillings, Roberto Divia, Wisla Carena, D. Di Bari, A. van den Brink, D. Evans, M. Henriquez, iden, Francesco Riggi, G. S. Pappalardo, P. G. Kuijer, D. Elia, G. Grella, Vito Manzari, F. Soramel, A. Vascotto, W. Snoeys, R. Lietava, R. Sené, J.B. Kinson, J. van Hunen, A. Palmeri, Janka Vrlakova, P. Jovanovic, J. Fedorisin, Adela Kravcakova, S. Di Liberto, B. Pastirčák, and Roberto Barbera
Subjects: Physics, Particle physics, Strange quark, Physics::Instrumentation and Detectors, Nuclear Theory, Hyperon, Omega baryon, Lambda baryon, Xi baryon, Sigma baryon, Baryon, Nuclear physics, Strange matter, High Energy Physics::Experiment, Nuclear Experiment
Abstract: The production of strange baryons and anti‐baryons in PbPb and pBe collisions has been studied by the NA57 experiment at the CERN SPS, extending down the centrality range covered by the previous WA97 experiment, and collecting data at two different energies. The enhanced production of such particles in central PbPb collisions with respect to pBe has been experimentally confirmed. This paper discusses results on Ⅺ and Λ hyperon production obtained at 40 and 158 A GeV/c.
Published: 2002

176. Measurement of neutral-current four-fermion production at LEP2

Author: Raimund Ströhmer, J. Letts, K. Hoffman, Matthias Schröder, L. L. Kormos, N. K. Watson, T. Schörner-Sadenius, A. J. Martin, James Pinfold, R. Seuster, Thorsten Wengler, S. Rosati, W. Mader, B. Caron, Graham Wilson, A. Leins, Richard Teuscher, Richard J. K. Taylor, D. Zer-Zion, M. Przybycień, M. Boutemeur, F. S. Merritt, F. K. Loebinger, Erez Etzion, Stefan Kluth, T. Kress, Shlomo Dado, Silvia Arcelli, Shlomit Tarem, P. Gagnon, E. Elfgren, R. J. Hemingway, Dave Charlton, A. Harel, Ikuo Ueda, D. M. Strom, Zoltan Laszlo Trocsanyi, Dong Hee Kim, A. A. Carter, Ivor Fleck, Georges Azuelos, E. Tsur, C. M. Hawkes, B. Vachon, H. Mes, I. P. Duerdoth, S. Braibant, S. Yamashita, P. Igo-Kemenes, M. Giunta, C. Ainsley, Gabriele Benelli, M. J. Oreglia, D. Toya, Joleen Pater, Edward K. G. Sarkisyan, A. Klier, Balazs Ujvari, H. A. Neal, J. Lillich, B. W. Kennedy, P. Jovanovic, J. Lu, Beatrix Dienes, Peter Krieger, M. Gruwé, Isabel Marian Trigger, K. W. Bell, J. Goldberg, K. Ishii, H. Jeremie, M. Verzocchi, J. C. Hill, S.J. Dallison, L. Zivkovic, Giora Mikenberg, Giovanni Abbiendi, H. Rick, P. Scharff-Hansen, P. Hüntemeyer, L. Brigliadori, Tobias Kramer, Robert McPherson, R. D. Heuer, P. F. Åkesson, W. J. McDonald, B. C. Shen, J. R. Carter, M. Donkers, A. M. Smith, S. W. O'Neale, Richard Nisius, Christoph Rembser, Gideon Bella, H. J. Burckhart, P. O. Günther, Daniele Bonacorsi, A. Csilling, B. Poli, C. Pahl, G. N. Patrick, Siegfried Bethke, W. Menges, Otmar Biebel, O. Schaile, D. Krop, W. G. Scott, Gunter Wolf, Andris Skuja, A. D. Schaile, Gabriella Pasztor, P. Vannerem, G. D. Lafferty, I. Nakamura, Guenter Duckeck, A. Mutter, Gordon H. Hanson, K. J. Anderson, C. Hensel, R. J. Batley, P. Mättig, Tetsuro Mashimo, Shoji Asai, D. J. Miller, M. F. Turner-Watson, Fabrizio Fabbri, A. Frey, J. W. Gary, M. Ford, Marco Cuffiani, A. Macpherson, R. K. Keeler, T. Behnke, J. von Krogh, Christoph Geich-Gimbel, M. Hauschild, G. P. Siroli, C. P. Ward, I. J. Bloodworth, A. Tricoli, M. Kupper, Christoph Schwick, Arnulf Quadt, S. Campana, P. M. Watkins, P. Mendez-Lorenzo, G. Gaycken, S. Spagnolo, Gianni Masetti, R. J. Hawkings, S. Söldner-Rembold, Marek Tasevsky, M. A. Thomson, Oliver Pooth, C. Y. Chang, Dezso Horvath, Thomas E Marchant, D. Axen, Oana Elena Vickey Boeriu, P. Renkel, D. Wetterling, H. Landsman, John Allison, T. R. Junk, M. Schumacher, S. Moed, F. Spano, Peter Sherwood, Kiyotomo Kawagoe, E. K. U. Gross, T. J. McMahon, P. J. Bell, Yoram Rozen, K. Sachs, Philip Bechtle, P. S. Wells, J. Ludwig, K. Runge, P. Bock, J. Dubbert, R. G. Kellogg, Terry Richard Wyatt, A. T. Watson, R. K. Carnegie, Csaba Hajdu, T. Trefzger, Norbert Wermes, T. Kawamoto, Stefano Marcellini, Vakhtang Kartvelishvili, J. A. Wilson, E. A. De Wolf, E. L. Barberio, M. Hamann, Junichi Kanzaki, J. Polok, G. Karapetian, D. Karlen, K. Buesser, S. Orito, J. Grunhaus, A. Fürtjes, R. J. Sobie, Daniel Lellouch, Joost Vossebeld, P. Amaral, Klaus Desch, J. A. McKenna, R. Howard, Takehiko Mori, Lutz Feld, A. Okpara, J. Hauschildt, J. M. Roney, Gregor Herten, Koichi Nagai, Sachio Komamiya, W. Mohr, J. E. Pilcher, D. Waller, K. Kruger, T. Saeki, Pamela Ferrari, J. G. Layter, R. Kowalewski, Gideon Alexander, C. F. Vollmer, Jochen Schieck, H. Voss, Ehud Duchovni, R. J. Barlow, Achim Stahl, K. Harder, Satoshi Mihara, Katja Klein, A. Michelini, Frank Fiedler, G. Giacomelli, R. M. Brown, A. De Roeck, M. Kobel, Lorne Levinson, T. Kobayashi, I. R. Bailey, C. H. Shepherd-Themistocleous, Frans Meijers, J. P. Martin, K. Stephens, Alain Bellerive, O. Sahr, N. Kanaya, G. Anagnostou, E. Torrence, A. Gupta, Alexander Oh, Paolo Giacomelli, Klaus Rabbertz, D. Lanske, M. Harin-Dirac, D. R. Ward, Stephen Lloyd, R. J. Homer, D. E. Plane, G. M. Dallavalle, P. Tran, Tara Shears, OPAL Collaboration, Opal, Collaboration, G., Abbiendi, and Spagnolo, Stefania Antonia
Subjects: Physics, Nuclear and High Energy Physics, Luminosity (scattering theory), Neutral current, 010308 nuclear & particles physics, Scattering, Electron–positron annihilation, FOS: Physical sciences, Fermion, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Standard Model, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, High Energy Physics::Experiment, Atomic physics, 010306 general physics, Particle Physics - Experiment, Event generator, Lepton
Abstract: Four-fermion final states qqbar e+e- and qqbar mu+mu- from neutral-current interactions in e+e- collisions are studied in the OPAL detector at LEP at centre-of-mass energies from 183 GeV to 209 GeV. The data analysed correspond to a total integrated luminosity of about 650 pb-1 recorded from 1997 to 2000. Corresponding to the acceptance of the OPAL detector, a signal definition is applied requiring both leptons to have a scattering angle satisfying cos0 qqbar e+e- and e+e- qqbar mu+mu- are consistent with the expectations from the Standard Model., 20 pages, 6 figures, Submitted to Physics Letters B
Published: 2002

177. STRANGE BARYON SIGNALS OF A NEW STATE OF MATTER IN LEAD-LEAD COLLISIONS AT THE CERN SPS

Author: W. Beusch, N. Carrer, M. Morando, D. Huss, V. Lenti, Franco Meddi, Federico Antinori, Marisa Gulino, Gunnar Løvhøiden, Tiziano Virgili, G.F. Segato, D. Di Bari, E. Quercigh, F. Antinori, G. Romano, O. Villalobos Baillie, D. Evans, M.F. Votruba, F. Fayazzadeh, M.E. Michalon-Mentzer, Petr Zavada, R. A. Fini, A. Michalon, I. J. Bloodworth, R. Lietava, A. Jacholkowski, Michael A. Thompson, T. Vik, M. Henriquez, Dieter Røhrich, Vito Manzari, J.B. Kinson, S. Di Liberto, G. Grella, R. A. Loconsole, P.I. Norman, G. T. Jones, A.K. Holme, Ivan Kralik, D. Elia, K. Šafa∙Ík, Pavel Staroba, J. Ftá∙Nik, M. A. Mazzoni, B. Ghidini, J. Urban, L. Sandor, Haavard Helstrup, K. Knudson, Rocco Caliandro, B. Pastir∙Ák, and K. Fanebust
Subjects: Physics, Baryon, Particle physics, Lead (geology), Large Hadron Collider, State of matter, Strangeness production
Published: 2001

178. Results on hyperon production from Na57

Author: M. Morando, S A Bull, Kondratev, Pavel Staroba, B. Ghidini, Roberto Divia, Domenico Di Bari, Karel Safarik, R. A. Fini, W. Snoeys, Giuseppe Bruno, A. Michalon, Ivan Kralik, P. Vande Vyvre, F.F. Valiev, K. Knudson, Anju Bhasin, F. Navach, G. A. Feofilov, R. Lietava, Petr Zavada, P.C. de Rijke, Trine Spedstad Tveter, M. Sené, Kristin Fanebust Hetland, T. Vik, Federico Antinori, R. Sené, Haavard Helstrup, E. Nappi, P. G. Kuijer, G Martinská, M. Campbell, R. Barbera, Rocco Caliandro, P.I. Norman, R. F. Clarke, G. T. Jones, S. Di Liberto, M. Spyropoulou-Stassinaki, D. Muigg, P. Jovanovic, F. Soramel, B. Pastirčák, Gunnar Løvhøiden, A. Palmeri, Davide Elia, J.B. Kinson, M. Luptak, G.F. Segato, Jozef Urban, M. A. Mazzoni, L. Šándor, E. Quercigh, G.S. Pappalardo, Jan Pisut, O. Villalobos Baillie, A.P. de Haas, A. Vascotto, Lenti, Manzari, F. Posa, J. van Hunen, G. Romano, J. Ftacnik, N Carrer, A.K. Holme, A. Belogianni, Franco Meddi, N. Pišútová, David H. Evans, G. Grella, A. Jacholkowski, A. van den Brink, J. Fedorisin, Adela Kravcakova, A.A. Kolozhvarii, Tiziano Virgili, Francesco Riggi, T.A. Tulina, E. Schillings, A. Jusko, P van de Ven, Wisla Carena, Janka Vrlakova, A. Badalà, I. J. Bloodworth, N. van Eijndhoven, I. Vinogradov, Dieter Røhrich, R. Kamermans, M.F. Votruba, F. Fayazzadeh, Andrea Dainese, M. Henriquez, Rosario Turrisi, 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), NA57, and Heyd, Yvette
Subjects: Physics, Nuclear and High Energy Physics, Focus (computing), Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Theory, Hyperon, Hyperons, Baryon, Nuclear physics, Quark Gluon Plasma, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Production (economics), Nuclear Experiment
Abstract: The NA57 experiment has been designed to study the onset of enhanced production of strange baryons and anti-baryons in Pb-Pb collisions with respect to p-Be collisions. Results from 40 and 160 A GeV/c Pb-Pb data will be shown. The main focus is on the checks of the NA57 analysis chain.
Published: 2001

179. Centrality dependence of strange baryon yields in Pb-Pb collisions

Author: I. J. Bloodworth, S. Di Liberto, J. Fedorisin, Adela Kravcakova, Petr Zavada, F.F. Valiev, Anju Bhasin, B. Pastirčák, A. Kolojvari, N. Carrer, J. Ftacnik, Giuseppe Bruno, G. A. Feofilov, F. Fayazzadeh, Andrea Dainese, Dieter Røhrich, L. Sandor, Haavard Helstrup, M. Henriquez, K. Fanebust, J. van Hunen, J. Pisutova, E. Nappi, Pavel Staroba, Roberto Divia, Gunnar Løvhøiden, D. Elia, J. Urban, T.A. Toulina, D. Muigg, Vito Manzari, G. Romano, E. Schillings, A. Vascotto, Wisla Carena, G. Martinská, A. Palmeri, D. Di Bari, Janka Vrlakova, N. van Eijndhoven, I. Vinogradov, Karel Safarik, W. Snoeys, M. Luptak, G.F. Segato, G. S. Pappalardo, P. G. Kuijer, D. Evans, P van de Ven, Trine Spedstad Tveter, P. Jovanovic, E. Quercigh, Angela Badala, O. Villalobos Baillie, V. P. Kondratiev, Roberto Barbera, R. Kamermans, M.F. Votruba, Rocco Caliandro, P.I. Norman, G. T. Jones, A. Jacholkowski, M. Campbell, J.B. Kinson, A. van den Brink, S A Bull, Rosario Turrisi, R. A. Fini, A. Michalon, K. Knudson, M. Morando, R. Sené, M. Sené, V. Lenti R. Lietava, P. Vande Vyvre, J. Pišút, F. Posa, Anton Jusko, Ivan Kralik, F. Soramel, Federico Antinori, A.K. Holme, A.P. de Haas, Franco Meddi, Tiziano Virgili, M. A. Mazzoni, B. Ghidini, F. Navach, T. Vik, R. F. Clarke, Francesco Riggi, G. Grella, Heyd, Yvette, Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and NA57
Subjects: Physics, Particle physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Nuclear Theory, Phase (waves), Function (mathematics), Collision, 01 natural sciences, Baryon, Nuclear physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, Nucleon, Centrality, Nuclear Experiment
Abstract: PoS(hep2001)248; New data on strange baryon yields in Pb–Pb interactions at 158 GeV/c per nucleon are presented as a function of the collision centrality. The possible onset of a deconfined phase when the collision involves from 50 to 100 wounded nucleons is discussed.
Published: 2001

180. Search for the Standard Model Higgs Boson in e+e- Collisions at sqrt(s) = 192-209 GeV

Author: M. Donkers, Satoshi Mihara, Siegfried Bethke, W. G. Scott, Katja Klein, A. Leins, M. A. Thomson, I. Nakamura, J. W. Gary, Thorsten Wengler, W. Menges, P. Gagnon, E. K. U. Gross, Frank Fiedler, P. Mendez-Lorenzo, B. Caron, N. K. Watson, G. Gaycken, P. G. Bright-Thomas, M. Sproston, D. Glenzinski, F. Odorici, E. A. De Wolf, O. Sahr, Marek Tasevsky, Dezso Horvath, M. J. Losty, K. Hoffman, Matthias Schröder, O. Runolfsson, R. Liebisch, K. Roscoe, Dave Charlton, J. Letts, Zoltan Laszlo Trocsanyi, Dong Hee Kim, C. Ainsley, L. Stumpf, A. M. Rossi, H. Mes, I. P. Duerdoth, S. Braibant, P. Hüntemeyer, G. P. Siroli, Christoph Schwick, R. J. Batley, I. J. Bloodworth, Naoko Kanaya, R. Kowalewski, S. Arcelli, A. Gupta, E. Clay, Achim Stahl, Norbert Wermes, Christoph Geich-Gimbel, C. Y. Chang, Claudio Grandi, P. F. Åkesson, J. M. Roney, Sherry Towers, T. Kawamoto, Shlomo Dado, J. S. White, M. Fanti, Gregor Herten, P. G. Estabrooks, R. K. Keeler, R. D. Heuer, Koichi Nagai, Georges Azuelos, Yoram Rozen, T. R. Junk, W. Mohr, S. Orito, James Pinfold, R. Seuster, Gideon Alexander, Paolo Capiluppi, K. Graham, Tara Shears, B. Vachon, S. Yamashita, Vakhtang Kartvelishvili, E. Tsur, C. M. Hawkes, Gideon Bella, S. D. Talbot, Isabel Marian Trigger, K. W. Bell, T. Kress, C. Hensel, P. S. Wells, T. Kämer, J. Goldberg, C. Sbarra, Arnulf Quadt, D. Toya, Paolo Giacomelli, H. J. Burckhart, Terry Richard Wyatt, J. E. Pilcher, A. A. Carter, P. Ferrari, P. Igo-Kemenes, Robert McPherson, P. M. Watkins, A. Fürtjes, J. Cammin, K. Harder, A. T. Watson, J. C. Hill, C. H. Shepherd-Themistocleous, T. Behnke, Junichi Kanzaki, J. Polok, Giora Mikenberg, M. Harin-Dirac, D. Karlen, V. Zacek, K. Ishii, H. Jeremie, Lutz Feld, K. Sachs, R. J. Homer, Paul Kyberd, Fabrizio Fabbri, A. Frey, P. Renkel, A. W. Lloyd, M. Gruwé, R. M. Brown, Lorne Levinson, E. Torrence, D. Axen, A. Jawahery, S. Rosati, German Martinez, Daniel Lellouch, Oana Elena Vickey Boeriu, Guenter Duckeck, Alexander Oh, G. D. Long, Giovanni Abbiendi, K. Stephens, M. Boutemeur, F. S. Merritt, J. Grunhaus, H. Landsman, Kiyotomo Kawagoe, D. R. Rust, F. K. Loebinger, M. J. Oreglia, A. Csilling, G. W. Wilson, T. Kuhl, M. Hauschild, Richard Nisius, Ivor Fleck, P. Scharff-Hansen, Daniele Bonacorsi, F. Spano, I. R. Bailey, I. Cohen, O. Biebel, Peter Sherwood, Takehiko Mori, A. Harel, Christoph Rembser, A. Okpara, A. Macchiolo, P. Mättig, D. Lanske, Klaus Rabbertz, A. J. Martin, Stephen Lloyd, Richard Teuscher, C. Littlewood, J. Böhme, Raimund Ströhmer, S.J. Dallison, Ikuo Ueda, D. M. Strom, Marco Cuffiani, C. R. Jones, D. Krop, J. Ludwig, K. Runge, P. Bock, G. Benelli, Richard J. K. Taylor, Alain Bellerive, D. E. Plane, J. Lu, Erez Etzion, A. D. Schaile, Gabriella Pasztor, N. L. Rodning, A. M. Smith, M. Verzocchi, T. Trefzger, Joleen Pater, Edward K. G. Sarkisyan, A. Klier, O. Schaile, J. Couchman, W. Mader, Ehud Duchovni, P. Dervan, B. Poli, J. A. McKenna, Juergen Thomas, J. R. Carter, G. N. Patrick, H. Rick, P. Vannerem, G. M. Dallavalle, Stefan Kluth, Shlomit Tarem, Andris Skuja, C. F. Vollmer, H. A. Neal, A. Michelini, J. von Krogh, D. R. Ward, K. R. Hossain, Tetsuro Mashimo, M. F. Turner-Watson, G. A. Snow, C. P. Ward, B. Surrow, A. Macpherson, T. Kobayashi, R. J. Barlow, R. J. Hawkings, D. Wetterling, F. G. Oakham, M. Kupper, S. Söldner-Rembold, C. Pahl, T. J. McMahon, G. D. Lafferty, D. I. Futyan, M. Ford, Thomas E Marchant, D. Zer-Zion, J. Dubbert, R. K. Carnegie, M. Schumacher, E. L. Barberio, R. J. Sobie, Sachio Komamiya, Beatrix Dienes, Joost Vossebeld, Oliver Pooth, Klaus Desch, Shoji Asai, J. A. Wilson, John Allison, R. Howard, L. Brigliadori, T. P. Kokott, D. Waller, G. Karapetian, T. Saeki, R. G. Kellogg, Csaba Hajdu, Stefano Marcellini, S. W. O'Neale, P. O. Günther, K. J. Anderson, A. K. Honma, D. J. Miller, S. Spagnolo, R. J. Hemingway, J. Lillich, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, Alessandro Montanari, P. E.L. Clarke, J. P. Martin, G. Anagnostou, H. Voss, G. G. Hanson, G. Giacomelli, I. Lawson, A. De Roeck, M. Kobel, M. S. Dixit, Frans Meijers, J. G. Layter, W. J. McDonald, B. C. Shen, and OPAL Collaboration
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), 010308 nuclear & particles physics, Electron–positron annihilation, High Energy Physics::Phenomenology, FOS: Physical sciences, 01 natural sciences, Upper and lower bounds, Lower limit, High Energy Physics - Experiment, 3. Good health, Standard Model, Nuclear physics, High Energy Physics - Experiment (hep-ex), Full data, Consistency (statistics), 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment
Abstract: A search for the Standard Model Higgs boson has been performed with the OPAL detector at LEP based on the full data sample collected at sqrt(s) = 192-209 GeV in 1999 and 2000, corresponding to an integrated luminosity of approximately 426 pb-1. The data are examined for their consistency with the background-only hypothesis and various Higgs boson mass hypotheses. A lower bound of 109.7 GeV is obtained on the Higgs boson mass at the 95% confidence level. At higher masses, the data are consistent with both the background and the signal-plus-background hypotheses., Comment: 19 pages, 7 figures, Accepted by Physics Letters B
Published: 2001
Full Text: View/download PDF

181. Determination of the event centrality in the WA97 and NA57 experiments

Author: Giorgio Torrieri, Rocco Caliandro, Roberto Barbera, Jan Pisut, G.S. Pappalardo, L. Sandor, Haavard Helstrup, T.A. Tulina, O. Villalobos Baillie, J. Urban, V. P. Kondratiev, J. Fedorisin, Michael A. Thompson, A. Kolojvari, N. Carrer, Anton Jusko, Ivan Kralik, F. Navach, E. Nappi, P. G. Kuijer, Rosario Turrisi, S. Di Liberto, A. Vascotto, B. Pastirčák, F. Posa, Wisla Carena, J.B. Kinson, V. Lenti, Janka Vrlakova, A. van den Brink, M. Morando, F.F. Valiev, R. A. Fini, B. Ghidini, E. Schillings, K. Fanebust, A. Michalon, D. Muigg, Eugenio Cantatore, Federico Antinori, David H. Evans, M. A. Mazzoni, G. Grella, Francesco Riggi, Pavel Staroba, G. Romano, R. Lietava, Roberto Divia, Domenico Di Bari, R. Sené, A. Palmeri, G Martinská, Davide Elia, T. Vik, W. Beusch, J. Ftacnik, A. Jacholkowski, W. Snoeys, P. Vande Vyvre, Trine Spedstad Tveter, D. Huss, Petr Zavada, K. Knudson, G. A. Feofilov, Gunnar Løvhøiden, M. Luptak, G.F. Segato, P.I. Norman, G. T. Jones, E. Quercigh, A.P. de Haas, A.K. Holme, N. Pišútová, M. Sené, M.E. Michalon-Mentzer, M. Campbell, Franco Meddi, Marisa Gulino, Tiziano Virgili, K. Šafařík, P van de Ven, Giuseppe Bruno, P. Jovanovic, A. Badalà, I. J. Bloodworth, Dieter Røhrich, R. Kamermans, M.F. Votruba, W. Klempt, F. Fayazzadeh, M. Henriquez, L. Vannucci, Vito Manzari, N. van Eijndhoven, I. Vinogradov, 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), and Heyd, Yvette
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Strange quark, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory, Nuclear Interactions, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear physics, Quark Gluon Plasma, Quark–gluon plasma, Nuclear Experiment, Nucleon, Centrality, Event (particle physics)
Abstract: The procedure employed by the WA97 and NA57 experiments to determine the number of wounded nucleons in different Pb + Pb centrality classes is discussed. We will also compare different centrality scales and their influence on the measurement of the centrality dependence of strange particle yields.
Published: 2001

182. Results on hyperon production from CERN NA57 experiment

Author: M. Sené, Franco Meddi, M. Henriquez, A. Jacholkowski, D. Elia, Leonid Vinogradov, E. Nappi, V. Lenti, Tiziano Virgili, Vito Manzari, E. Schillings, Pavel Staroba, Roberto Divia, F. Soramel, Anton Jusko, Ivan Kralik, R. Kamermans, Federico Antinori, M.F. Votruba, Giuseppe Bruno, N. van Eijndhoven, P.C. de Rijke, R. Lietava, Wisla Carena, R. Sené, Rocco Caliandro, J. Urban, D. Di Bari, S A Bull, Janka Vrlakova, M. Campbell, A. Vascotto, D. Evans, J. Ftacnik, A.P. de Haas, F.F. Valiev, L. Sandor, J. Fedorisin, Adela Kravcakova, K. Šafařík, Trine Spedstad Tveter, Haavard Helstrup, K. Fanebust, J.B. Kinson, F. Fayazzadeh, W. Snoeys, A.K. Holme, M. A. Mazzoni, P.I. Norman, G. T. Jones, J. van Hunen, B. Ghidini, I. J. Bloodworth, P. Jovanovic, P van de Ven, P. Vande Vyvre, A. Palmeri, J. Pišút, F. Navach, Dieter Røhrich, Petr Zavada, K. Knudson, N. Pisutova, G. Romano, A. van den Brink, N. Carrer, O. Villalobos Baillie, V. P. Kondratiev, G. S. Pappalardo, P. G. Kuijer, Rosario Turrisi, M. Morando, Roberto Barbera, Anatoly Kolozhvari, Anju Bhasin, Francesco Riggi, G. A. Feofilov, G. Grella, F. Posa, S. Di Liberto, T. Vik, B. Pastirčák, R. F. Clarke, T.A. Toulina, D. Muigg, Gunnar Løvhøiden, M. Luptak, G.F. Segato, E. Quercigh, Angela Badala, R. A. Fini, A. Michalon, G. Martinská, 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), NA57, and Heyd, Yvette
Subjects: Physics, Particle physics, Large Hadron Collider, Nuclear Theory, Hyperon, Xi baryon, Baryon, Momentum, Nuclear physics, [PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Quark–gluon plasma, High Energy Physics::Experiment, Nuclear Experiment, Nucleon, Beam (structure)
Abstract: NA57 has been specifically designed to study the onset of strange baryon and antibaryon enhancements in Pb-Pb with respect to p-Be collisions, first observed by the WA97 experiment at 160 A GeV/c beam momentum. The aim is to look for the dependence of these enhancements on the interaction volume, as measured by the number of wounded nucleons, and the energy per incoming nucleon. In NA57 the centrality range goes down to a lower limit of about 50 wounded nucleons, compared with about 100 in WA97. Data have been collected both at 160 and at 40 A GeV/c, while WA97 collected data only at the top SPS beam momentum of 160 A GeV/c. In this contribution we recall the main features of the NA57 experiment and we present the first results on Ⅺ− and Ⅺ+ hyperon production in Pb-Pb collisions at 160 A GeV/c.
Published: 2001

183. Strange and multi-strange baryon production at SPS as a probe of QGP formation

Author: Ivan Kralik, N. Carrer, I. J. Bloodworth, L. Sandor, W. Beusch, Haavard Helstrup, Franco Meddi, D. Huss, M. Morando, M. A. Mazzoni, Tiziano Virgili, B. Ghidini, Trine Spedstad Tveter, Federico Antinori, O. Villalobos Baillie, A. Jacholkowski, D. Di Bari, J. Ftacnik, K. Šafařík, G. Lo, D. Elia, P.I. Norman, G. T. Jones, D. Evans, K. Knudson, Pavel Staroba, Vito Manzari, K. Fanebust, vho, M.F. Votruba, Petr Zavada, R. Lietava, Michael A. Thompson, A.K. Holme, iden, J. Urban, Rocco Caliandro, J.B. Kinson, G. Romano, T.F. Thorsteinsen, G. Grella, V. Lenti, H. Bakke, R. A. Fini, A. Michalon, G.F. Segato, E. Quercigh, M.E. Michalon-Mentzer, R. A. Loconsole, S. Di Liberto, B. Pastirčák, and Giorgio Torrieri
Subjects: Baryon, Nuclear physics, Physics, Strange quark, Particle physics, Large Hadron Collider, Nuclear Theory, Quark–gluon plasma, Transverse momentum, Strangeness production, Rapidity, Nuclear Experiment
Abstract: The WA97 experiment studies strangeness production at central rapidity in Pb-Pb, p-Pb and p-Be collisions at CERN SPS. A comprehensive study, including the most recent results on yields and transverse momentum spectra of strange and multi-strange particles, is presented.
Published: 2000

184. Probing the specific entropy produced in ultrarelativistic heavy-ion collisions with a silicon pixel multiplicity detector: a simulation study

Author: I. J. Bloodworth, G.S. Pappalardo, E. Nappi, O. Villalobos Baillie, Federico Antinori, K. Šafařík, P van de Ven, R. A. Fini, A. Michalon, Eugenio Cantatore, M. A. Mazzoni, V. Lenti, Domenico Di Bari, G. A. Feofilov, M. Luptak, G.F. Segato, E. Quercigh, A.P. de Haas, Petr Zavada, M. Botje, T.A. Tulina, Dieter Røhrich, A. K. Holme, A. Badalà, Pavel Staroba, Roberto Divia, M.E. Michalon-Mentzer, N. Pišútová, P. Vande Vyvre, A. Kolojvari, N. Carrer, M. Morando, B. Ghidini, O.I. Stolyarov, F.A. Tsimbal, R. Turrisi, Giorgio Torrieri, Franco Meddi, E. Schillings, B. Kocper, G. Tomasicchio, Marisa Gulino, Gunnar Løvhøiden, R. Kamermans, M.F. Votruba, G. Romano, W. Klempt, Jan Pisut, L. Vannucci, Francesco Riggi, Rocco Caliandro, Vito Manzari, G. Grella, P. G. Kuijer, N. van Eijndhoven, I. Vinogradov, M. Campbell, P. Jovanovic, K. Fanebust, J. Urban, J. Fedorisin, David H. Evans, Anton Jusko, Ivan Kralik, L. Sandor, Haavard Helstrup, F. Posa, F.F. Valiev, Wisla Carena, F. Pellegrini, Michael A. Thompson, A. Vascotto, A. van den Brink, G Martinská, Trine Spedstad Tveter, K. Knudson, J. Ftacnik, R. Lietava, P.I. Norman, G. T. Jones, Janka Vrlakova, Roberto Barbera, A. Jacholkowski, W. Snoeys, J.B. Kinson, Davide Elia, A. Palmeri, S. Di Liberto, B. Pastirčák, F. Navach, T. Virgili, Institut de Recherches Subatomiques (IReS), and 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)
Subjects: Physics, Nuclear and High Energy Physics, Large Hadron Collider, Silicon, Pixel, Physics::Instrumentation and Detectors, Detector, chemistry.chemical_element, Quark Gluon Plasma, Silicon pixel detector, Nuclear physics, Baryon, chemistry, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Quark–gluon plasma, Entropy (information theory), Nuclear Experiment, Nucleon, Instrumentation
Abstract: A simulation study of a silicon pixel multiplicity detector proposed for the NA57 experiment at CERN SPS has been carried out to evaluate its capability to measure both the total multiplicity and the net baryon content created in Pb+Pb collisions at 40 and 160 GeV/ c per nucleon in order to get information on the specific entropy produced in the reaction. A method of charge assignment is proposed and discussed in detail and the results of the simulation are presented. A benchmark of the method using computer-generated events is also performed.
Published: 2000

185. Inclusive production of $D^{*\pm}$ mesons in photon-photon collisions at $\sqrt{s}_{ee}$= 183 and 189 GeV and a first measurement of $F^{\gamma}_{2,c}$

Author: H. Mes, I. P. Duerdoth, S. Braibant, T. R. Junk, P. S. Wells, G. Mikenberg, P. Hüntemeyer, Terry Richard Wyatt, A. T. Watson, Ekg Sarkisyan, T. Kobayashi, P. Igo-Kemenes, Ehud Duchovni, K. Ishii, T. Behnke, H. Jeremie, T. Kuhl, N. K. Watson, Richard Nisius, Matthias Schröder, M. Jimack, O. Schaile, B. List, Erez Etzion, M. Thiergen, A. Michelini, F. Wäckerle, D. M. Gingrich, R. G. Kellogg, Marco Cuffiani, P. E.L. Clarke, G. Gaycken, P. G. Bright-Thomas, Dave Charlton, Shlomit Tarem, J. P. Martin, I. J. Bloodworth, D. Lanske, Stefano Marcellini, C. Y. Chang, A. Macpherson, M. Schumacher, A. M. Rossi, J. Lauber, B. Surrow, P. Taras, Yoram Rozen, P. I. Kayal, S. A. Robins, P. F. Åkesson, F. Odorici, Paul Kyberd, F. K. Loebinger, Ivor Fleck, H. Rick, Achim Stahl, Naoko Kanaya, R. L. Coxe, R. J. Sobie, R. Liebisch, Joleen Pater, A. Klier, R. D. Heuer, A. J. Martin, S. Baumann, Norbert Wermes, A. Hocker, K. Ackerstaff, D. R. Rust, K. Hoffman, Junichi Kanzaki, S. D. Talbot, H. A. Neal, Sherry Towers, Klaus Desch, J. Polok, T. Kawamoto, D. Karlen, Raimund Ströhmer, R. Howard, Thorsten Wengler, A. D. Schaile, D. Chrisman, G. D. Long, Gideon Bella, J. A. McKenna, O. Runolfsson, Gabriella Pasztor, P. Vannerem, P. Scharff-Hansen, M. Fanti, S. Orito, A. Biguzzi, E. A. Mckigney, J. Couchman, W. Mader, S. Betts, A. K. Honma, H. Voss, M. Hapke, J. G. Layter, W. M. Sang, C. K. Hargrove, C. H. Shepherd-Themistocleous, J. Grunhaus, Robert McPherson, K. Graham, G. A. Snow, C. P. Ward, Claudio Grandi, T. Barillari, Tara Shears, H. J. Burckhart, Jacqueline Batley, Stefan Schmitt, Fabrizio Fabbri, Richard Teuscher, Claudia Ciocca, A. Frey, S. Söldner-Rembold, W.J. McDonald, Beatrix Dienes, S. Rosati, D. J. Miller, M. J. Oreglia, O. C. Cooke, A. A. Faust, F. Fiedler, P. Pfeifenschneider, Shoji Asai, G. D. Lafferty, D. I. Futyan, R. Kowalewski, J. R. Carter, F. R. Jacob, S.J. Dallison, J. Letts, S. Arcelli, A. M. Smith, J. Goldberg, P. Gagnon, A. Harel, J. Patt, André Schöning, L. Brigliadori, O. Sahr, Ikuo Ueda, D. M. Strom, J. Allison, G. N. Patrick, Daniel Lellouch, J. Lu, Takehiko Mori, S. Spagnolo, A. W. Lloyd, G. Giacomelli, A. Okpara, R. Hawkings, C. R. Jones, Juergen Thomas, P. Mättig, I. Lawson, Gideon Alexander, Satoshi Mihara, K. Sachs, A. De Roeck, M. Kobel, Paolo Capiluppi, Shlomo Dado, P. G. Estabrooks, R. K. Keeler, Zoltan Laszlo Trocsanyi, Sachio Komamiya, R VanKooten, C. Sbarra, S. W. O'Neale, G. W. Wilson, M. Hauschild, M. S. Dixit, Frans Meijers, H. Landsman, Dong Hee Kim, Michael Hildreth, Alain Bellerive, I. Cohen, R. J. Barlow, Christoph Rembser, M. Verzocchi, Arnulf Quadt, James Pinfold, R. Perez-Ochoa, R. Seuster, Paolo Giacomelli, M. Hansroul, N. L. Rodning, P. Dervan, M. Fierro, P. M. Watkins, M. Kolrep, B. Poli, F. G. Oakham, K. J. Anderson, T. P. Kokott, D. Waller, S. F. Ashby, M. Harin-Dirac, E. L. Barberio, R. J. Homer, K. Stephens, V. Zacek, T. Saeki, Marcello Mannelli, C. Littlewood, R. J. Hemingway, K. Stoll, Andris Skuja, J. Lillich, D. Axen, Alessandra Fanfani, R. Davis, S. Petzold, B. W. Kennedy, P. Jovanovic, Tetsuro Mashimo, M. F. Turner-Watson, A. Jawahery, Austin Ball, Peter Krieger, Oana Elena Vickey Boeriu, Alessandro Montanari, I. Meyer, Peter Sherwood, Stan Bentvelsen, M. Kupper, G. Duckeck, W. Gorn, A. Macchiolo, J. Ludwig, K. Runge, P. Bock, I. Trigger, Thomas E Marchant, D. R. Ward, Peter R Hobson, T. J. McMahon, D. Zer-Zion, C. Couyoumtzelis, M. A. Thomson, J. Dubbert, R. K. Carnegie, E. K. U. Gross, D. E. Plane, Georges Azuelos, M. Sproston, E. Tsur, C. M. Hawkes, K. W. Bell, Kiyotomo Kawagoe, J. C. Hill, B. C. Shen, G. M. Dallavalle, Satoru Yamashita, M. Donkers, J. A. Wilson, Siegfried Bethke, W. G. Scott, I. Nakamura, J. Böhme, J. W. Gary, P. Mendez-Lorenzo, D. Glenzinski, P. Ferrari, Dezso Horvath, M. J. Losty, G. Karapetian, T. Trefzger, K. R. Hossain, K. Roscoe, German Martinez, Daniele Bonacorsi, E. Torrence, E. Clay, J. M. Roney, K. Harder, Koichi Nagai, J. Schieck, R. M. Brown, D. C. Imrie, Lorne Levinson, J. von Krogh, W. Mohr, I. R. Bailey, O. Biebel, G. P. Siroli, Christoph Schwick, M. Gruwé, M. Boutemeur, F. S. Merritt, M. Przybycień, T. Kress, A. A. Carter, Giovanni Abbiendi, H. O. Ogren, Christoph Geich-Gimbel, Vakhtang Kartvelishvili, S. L. Lloyd, J. E. Conboy, A. Fürtjes, Lutz Feld, Gregor Herten, and J. E. Pilcher
Subjects: Physics, Particle physics, Photon, Physics and Astronomy (miscellaneous), Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Perturbative QCD, Order (ring theory), 01 natural sciences, Photon structure function, Charm quark, Nuclear physics, Pseudorapidity, 0103 physical sciences, Production (computer science), High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: The inclusive production of D*+- mesons in photon-photon collisions has been measured using the OPAL detector at LEP at e+e- centre-of-mass energies of 183 and 189GeV. The D* mesons are reconstructed in their decay to D0pi+ with the D0 observed in the two decay modes Kpi+ and Kpi+pi-pi+. After background subtraction, 100.4+-12.6(stat) D*+- mesons have been selected in events without observed scattered beam electron ("anti-tagged") and 29.8+-5.9 (stat) D*+- mesons in events where one beam electron is scattered into the detector ("single-tagged"). Direct and single-resolved events are studied separately. Differential cross-sections as functions of the D* transverse momentum p_t and pseudorapidity \eta are presented in the kinematic region 2
Published: 1999

186. Strangeness enhancement at mid-rapidity in Pb–Pb collisions at 158 A GeV/c

Author: F. Navach, F. Posa, N. Carrer, R. A. Fini, Giorgio Torrieri, A. Michalon, Franco Meddi, Jozef Urban, S. Szafran, Federico Antinori, G. Tomasicchio, Petr Zavada, Erik H.M. Heijne, Davide Elia, Giovanni Darbo, B.T.H. Knudsen, I. Králik, M. Luptak, G.F. Segato, Michael A. Thompson, B.C. Earl, S. Saladino, Paolo Martinengo, E. Quercigh, Eugenio Cantatore, M.F. Votruba, W. Klempt, G. Rosa, Trine Spedstad Tveter, E. Chesi, Bianca Osculati, A. Kirk, S. Di Liberto, M. A. Mazzoni, G. Romano, Domenico Di Bari, Jean-Charles Fontaine, I. J. Bloodworth, M.E. Michalon-Mentzer, B. Pastirčák, P.I. Norman, G. T. Jones, H. Beker, K. Knudson, W. Beusch, H. Rotscheidt, J. Bohm, M. Dameri, L. Šándor, F. Pellegrini, M. Venables, H. Bakke, Gunnar Løvhøiden, V. Mack, T. Virgili, S. Simone, E. Andersen, D. Huss, Dario Barberis, R.A. Loconsole, E. Nappi, N. Armenise, T.F. Thorsteinsen, T. Kachelhoffer, M.T. Muciaccia, M. Morando, M. Sené, B. Ghidini, A. Jacholkowski, P. Jovanovic, M. Campbell, Haavard Helstrup, W. Snoeys, R. Lietava, David H. Evans, J. Bán, M. G. Catanesi, A.K. Holme, O. Villalobos Baillie, P. Middelkamp, R. A. Ricci, J. Ftáčnik, Pavel Staroba, Rocco Caliandro, Vito Manzari, G. Grella, A. Diaczek, J.B. Kinson, K. Fanebust, A. Volte, R. Sené, K. Piska, Michele Guida, V. Lenti, Leonardo Paolo Rossi, C. Salvo, K. Šafařík, and A. Jusko
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Strangeness, Lambda baryon, Omega, Xi baryon, Nuclear physics, Transverse mass, Rapidity, Nucleon, Nuclear Experiment, Glauber, Particle Physics - Experiment
Abstract: $K^{0}_{s}$, $\Lambda$, $\Xi$, $\Omega$ and negative particle yields and transverse mass spectra have been measured at central rapidity in Pb-Pb and p-Pb collisions at 158 $A$ GeV/$c$. The yields in Pb-Pb interactions % are presented as a function of the collision centrality and compared with those obtained from p-Pb collisions. Strangeness enhancement in Pb-Pb relative to p-Pb collisions increases with the strangeness content of the particle. Going from p-Pb to Pb-Pb, the strange particle yields increase faster than linearly with the number of participants $N_{part}$ up to $N_{part} \approx 100$, thereafter the increase becomes %linear with $N_{part}$. Yields are studied as a function of the number of nucleons participating in the collision $N_{part}$, which is estimated with the Glauber model. From p-Pb to Pb-Pb collisions the particle yields per participant increase substantially. The enhancement is more pronounced for multistrange particles, and exceeds an order of magnitude for the $\Omega$. For a number of participants, $N_{part}$, greater than $100$, however, all yields per participant appear to be constant.
Published: 1999

187. Multi-photon production in e+e− collisions at √s = 189 GeV

Author: M. Schumacher, John Allison, Raimund Ströhmer, F. Odorici, Otmar Biebel, S. Yamashita, K. Hoffman, P. Igo-Kemenes, T. R. Junk, R. G. Kellogg, D. Axen, K. Ishii, H. Jeremie, P. Poffenberger, P. S. Wells, D. J. Miller, Dave Charlton, M. Fierro, I. J. Bloodworth, A. Jawahery, Csaba Hajdu, Oana Elena Vickey Boeriu, O. Runolfsson, S. Baumann, Stefano Marcellini, Terry Richard Wyatt, Claudio Grandi, J. S. White, O. C. Cooke, Ekg Sarkisyan, P. Pfeifenschneider, Peter Sherwood, R. Kowalewski, P. I. Kayal, Alexander Wagner, A. Macchiolo, S. Arcelli, E. A. Mckigney, Yoram Rozen, Beatrix Dienes, A. Biguzzi, A. J. Martin, O. Schaile, D. Lanske, R. D. Heuer, J. Ludwig, K. Runge, L. Brigliadori, J. Patt, André Schöning, Gideon Alexander, W. M. Sang, J. G. Layter, P. Bock, S. Robertson, Norbert Wermes, H. Mes, P. Scharff-Hansen, Paolo Capiluppi, I. P. Duerdoth, S. Braibant, J. Lauber, Sherry Towers, O. Sahr, Junichi Kanzaki, J. Polok, Erez Etzion, J. Couchman, A. Macpherson, T. Kawamoto, W. Mader, D. I. Futyan, C. K. Hargrove, D. Karlen, Gideon Bella, S. D. Talbot, S. W. O'Neale, R. L. Coxe, P. Hüntemeyer, Shlomit Tarem, Matthias Schröder, K. J. Anderson, M. Thiergen, A. M. Smith, P. E.L. Clarke, T. Kuhl, Stefan Schmitt, S. Orito, D. Chrisman, G. D. Long, H. J. Burckhart, Jacqueline Batley, Richard Nisius, Achim Stahl, A. D. Schaile, T. Behnke, B. Surrow, Gabriella Pasztor, Klaus Desch, C. H. Shepherd-Themistocleous, B. List, P. Vannerem, C. Sbarra, F. R. Jacob, J. P. Martin, A. M. Rossi, P. G. Estabrooks, R. K. Keeler, Richard Teuscher, R. Howard, F. Fiedler, Marco Cuffiani, R. Hawkings, K. Stoll, Stephen Lloyd, H. Landsman, Andris Skuja, C. Y. Chang, S. Petzold, S. Betts, Ehud Duchovni, S. De Jong, G. A. Snow, C. P. Ward, N. K. Watson, Arnulf Quadt, M. Hapke, S. Rosati, Tetsuro Mashimo, Shoji Asai, P. Taras, J. Goldberg, K. Stephens, M. F. Turner-Watson, K. Graham, Tara Shears, M. Jimack, Paul Kyberd, Naoko Kanaya, F. K. Loebinger, S. Söldner-Rembold, H. Rick, A. Michelini, Ivor Fleck, M. Watkins, C. R. Jones, P. Gagnon, A. Harel, A Höcker, C. Littlewood, Ikuo Ueda, D. M. Strom, J. Lu, J. Letts, Joleen Pater, T. Kobayashi, A. Klier, F. G. Oakham, W. Gorn, Zoltan Laszlo Trocsanyi, Dong Hee Kim, M. J. Oreglia, Daniel Lellouch, E. L. Barberio, A. W. Lloyd, G. W. Wilson, Takehiko Mori, I. Cohen, H. A. Neal, Peter R Hobson, Thomas E Marchant, Paolo Giacomelli, K. Sachs, Shlomo Dado, G. G. Hanson, M. Hansroul, A. A. Faust, A. Okpara, P. Mättig, Christoph Rembser, James Pinfold, R. Perez-Ochoa, R. Seuster, S. A. Robins, S.J. Dallison, M. Hauschild, Michael Hildreth, Alain Bellerive, R. J. Hemingway, G. Giacomelli, I. Lawson, J. Lillich, Christopher Hawkes, I. Trigger, M. Verzocchi, R. Liebisch, K. Ackerstaff, M. Kolrep, A. De Roeck, M. Kobel, B. W. Kennedy, D. Zer-Zion, D. R. Ward, J. R. Carter, G. N. Patrick, Sachio Komamiya, M. Harin-Dirac, V. Zacek, A. T. Watson, P. Jovanovic, Austin Ball, N. L. Rodning, Peter Krieger, Giora Mikenberg, J. W. Gary, R. J. Homer, M. S. Dixit, Frans Meijers, Satoshi Mihara, S. F. Ashby, Marcello Mannelli, S. B. Anderson, Alessandro Montanari, I. Meyer, P. Dervan, B. Poli, H. Voss, R. J. Barlow, T. P. Kokott, D. Waller, Stan Bentvelsen, S. Spagnolo, T. Saeki, Randall Sobie, G. D. Lafferty, Alessandra Fanfani, R. Davis, Guenter Duckeck, J. Grunhaus, Juergen Thomas, Claudia Ciocca, M. Fanti, D. E. Plane, G. M. Dallavalle, P. Ferrari, K. Roscoe, German Martinez, Robert McPherson, E. Torrence, J. M. Roney, W. J. McDonald, E. Clay, B. C. Shen, M. Donkers, M. Przybycień, T. Kress, Kiyotomo Kawagoe, T. Trefzger, Siegfried Bethke, D. Liu, A. K. Honma, A. A. Carter, Koichi Nagai, K. R. Hossain, Fabrizio Fabbri, A. Frey, J. Schieck, W. R. Gibson, W. G. Scott, D. C. Imrie, K. Harder, I. Nakamura, W. Mohr, Giovanni Abbiendi, G. P. Siroli, Daniele Bonacorsi, Christoph Schwick, D. R. Rust, R. M. Brown, Lorne Levinson, P. Mendez-Lorenzo, D. Glenzinski, J. von Krogh, Dezso Horvath, M. J. Losty, M. A. Thomson, M. Gruwé, D. Wetterling, T. J. McMahon, C. Couyoumtzelis, J. Dubbert, R. K. Carnegie, J. A. Wilson, J. Böhme, E. K. U. Gross, R. Van Kooten, M. Sproston, F. Wäckerle, D. M. Gingrich, Georges Azuelos, E. Tsur, K. W. Bell, J. C. Hill, M. Boutemeur, F. S. Merritt, J. Bechtluft, J. A. McKenna, H. O. Ogren, Christoph Geich-Gimbel, Vakhtang Kartvelishvili, J. E. Conboy, A. Fürtjes, Lutz Feld, Gregor Herten, J. E. Pilcher, G. Gaycken, and P. G. Bright-Thomas
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Photon, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, Resonance, Context (language use), 01 natural sciences, 7. Clean energy, Nuclear physics, Excited state, 0103 physical sciences, High Energy Physics::Experiment, Invariant mass, 010306 general physics
Abstract: The process e+e−→γγ(γ) is studied using data recorded with the OPAL detector at LEP. The data sample taken at a centre-of-mass energy of 189 GeV corresponds to a total integrated luminosity of 178 pb−1. The measured cross-section agrees well with the expectation from QED. A fit to the angular distribution is used to obtain improved limits at 95% CL on the QED cut-off parameters: Λ+> 304 GeV and Λ−> 295 GeV as well as a mass limit for an excited electron, Me* > 306 GeV assuming equal e*ey and eeγ couplings. Graviton exchange in the context of theories with higher dimensions is excluded for scales G+< 660 GeV and G−< 634 GeV. No evidence for resonance production is found in the invariant mass spectrum of photon pairs. Limits are obtained for the cross-section times branching ratio for a resonance decaying into two photons and produced in association with another photon.
Published: 1999

188. Search for chargino and neutralino production at root s=170 and 172 GeV at LEP

Author: D. R. Rust, L. Brigliadori, Kiyotomo Kawagoe, P. G. Estabrooks, R. K. Keeler, T. Behnke, A. M. Lee, N. K. Watson, W. J. McDonald, P. M. Watkins, John Allison, E. von Törne, K. R. Hossain, D. Chrisman, G. D. Long, Volker Blobel, S. W. O'Neale, K. J. Anderson, Stephen Lloyd, T. J. McMahon, R. G. Kellogg, A. Macchiolo, M. Gruwé, C. M. Hawkes, C. Dallapiccola, B. C. Shen, Siegfried Bethke, A. K. Honma, W. G. Scott, I. Nakamura, P. E.L. Clarke, M. K. Jones, J. P. Martin, C. Hartmann, R. K. Carnegie, M. Herndon, M. Bobinski, J. A. Wilson, Csaba Hajdu, Richard Teuscher, A. S. Turcot, Stefano Marcellini, F. Fiedler, U. Müller, A. J. Martin, J. Letts, M. Fanti, P. Poffenberger, M. Fierro, J. E.G. Edwards, B. Stockhausen, Paul Kyberd, F. K. Loebinger, R. Davis, Silvia Arcelli, M. Schumacher, E. Lefebvre, Richard Nisius, U. Ruppel, M. R. Ingram, D. E. Plane, Stephen Hillier, D. Glenzinski, G. M. Dallavalle, Dezso Horvath, M. J. Losty, S. De Jong, O. C. Cooke, P. Pfeifenschneider, D. Lazic, J. Steuerer, Ivor Fleck, Joleen Pater, K. Sachs, Shlomo Dado, Robert McPherson, F. Odorici, J. Patt, Beatrix Dienes, G. Yekutieli, A. Klier, R. Giacomelli, A. Oh, C. K. Hargrove, Ekg Sarkisyan, P. W. Jeffreys, S. Baumann, E. A. Mckigney, W. P. Lai, Marco Cuffiani, Mathieu Doucet, R. D. Heuer, Tara Shears, Jean-Arcady Meyer, A. Schüning, A. N. Bell, P. S. Wells, S. Yamashita, P. Igo-Kemenes, M. Boutemeur, F. S. Merritt, A. A. Carter, Ron Folman, Gideon Alexander, James Pinfold, Paolo Capiluppi, R. Perez-Ochoa, D. G. Fong, Fabrizio Fabbri, J. M. Roney, R. Van Kooten, P. A. Hart, J. Gascon, N. Altekamp, H. Voss, Ehud Duchovni, R. J. Barlow, M. Jimack, Terry Richard Wyatt, K. Ishii, Paolo Giacomelli, H. Jeremie, J. E. Bloomer, M. Hansroul, A. Michelini, P. Müttig, M. Kolrep, Giora Mikenberg, P. Utzat, Satoshi Tanaka, T. Kobayashi, M. J. Pearce, D. I. Futyan, M. Hapke, C. Burgard, C. Y. Chang, R. J. Homer, A. Macpherson, Satoshi Mihara, G. G. Hanson, Gideon Bella, Daniele Bonacorsi, D. J. Miller, S. Braibant, A. D. Schaile, Gabriella Pasztor, M. A. Thomson, H. Mes, I. P. Duerdoth, P. Taras, Michael Kobel, F. Wäckerle, P. Vikas, J. von Krogh, D. Lanske, J. W. Gary, A. Joly, Reda Tafirout, Klaus Kurt Desch, M. Thiergen, O. Schaile, S. B. Anderson, E. do Couto e Silva, P. Szymanski, H. J. Burckhart, Jacqueline Batley, R. Howard, J. Grunhaus, Claire Shepherd-Themistocleous, J. S. White, E. K. U. Gross, G. W. Wilson, D. S. Koetke, Marcello Mannelli, D. M. Gingrich, C. Sbarra, J. Bechtluft, U. Jost, R. Mir, Allen Mincer, Stan Bentvelsen, G. Giacomelli, J. A. McKenna, G. A. Snow, C. P. Ward, D. E. Hutchcroft, M. J. Oreglia, Julie Kirk, P. Hüntemeyer, P. Scharff-Hansen, M. S. Dixit, L. A. del Pozo, S. R. Lautenschlager, H. A. Neal, Frans Meijers, M. Sproston, Sven Menke, K. Stephens, S. Söldner-Rembold, D. M. Strom, M. Hauschild, R. Hawkings, C. Markus, P. Gagnon, A. A. Faust, R. Rylko, A. M. Smith, Hans-Christian Schultz-Coulon, Randall Sobie, G. D. Lafferty, O. Runolfsson, W. R. Gibson, A. Biguzzi, R. Bartoldus, H. O. Ogren, Christoph Geich-Gimbel, S. M. Gascon-Shotkin, B. T. Bouwens, G. T. Jones, E. H. Vokurka, K. Stoll, Andris Skuja, S. Petzold, C. R. Jones, R. M. Brown, Tetsuro Mashimo, Lorne Levinson, F. G. Oakham, C. Beeston, B. Schmitt, Vakhtang Kartvelishvili, A. Skillman, V. Gibson, E. L. Barberio, A. Rooke, J. G. Layter, Guenter Duckeck, J. E. Conboy, A. Fürtjes, J. R. Carter, W. Gorn, Claudio Grandi, M. Schrüder, D. Rigby, R. J. Hemingway, D. L. Rees, G. N. Patrick, B. W. Kennedy, T. R. Junk, Dave Charlton, P. Jovanovic, Austin Ball, F. Scharf, Otmar Biebel, M. F. Turner-Watson, M. Morii, Peter Krieger, Peter R Hobson, S. Robertson, Gregor Herten, B. Wilkens, German Martinez, Alessandro Montanari, D. Zer-Zion, P. Routenburg, I. Trigger, R. Bürgin, Sachio Komamiya, Theodoros Geralis, E. Ros, A. T. Watson, J. E. Pilcher, D. R. Ward, T. Kress, J. Schieck, W. Mohr, A. Sittler, T. P. Kokott, A. Posthaus, T. Saeki, P. I. Kayal, N. J. Oldershaw, Peter Schleper, Zoltan Laszlo Trocsanyi, Norbert Wermes, Sherry Towers, T. Kawamoto, S. Orito, S. D. Bird, P. Schenk, D. Axen, A. Jawahery, Matthew Evans, Peter Sherwood, Alexander Wagner, A. M. Rossi, J. Ludwig, K. Runge, P. Bock, J. Lauber, H. M. Fischer, S. D. Talbot, D. Eatough, N. I. Geddes, Michael Hildreth, N. L. Rodning, B. Poli, R. W. Springer, Georges Azuelos, E. Tsur, M. Verzocchi, K. W. Bell, J. Pálinkás, J. C. Hill, S. A. Robins, Gunter Wolf, K. Ackerstaff, I. J. Bloodworth, Yoram Rozen, R. Lahmann, D. C. Imrie, M. Foucher, Stefan Kluth, Shlomit Tarem, G. P. Siroli, J. Goldberg, B. Nellen, Christoph Schwick, H. G. Evans, D. Karlen, M. J. Goodrick, I. Cohen, Daniel Lellouch, Takehiko Mori, V. Zacek, Stefan Schmitt, Shoji Asai, and K. Nagai
Subjects: Physics, Particle physics, E+E ANNIHILATION, Physics and Astronomy (miscellaneous), ENERGIES, Electron–positron annihilation, Scalar (mathematics), P(P)OVER-BAR COLLISIONS, Lower limit, PARAMETERS, OPAL DETECTOR, CROSS-SECTIONS, Nuclear physics, PHYSICS, Pair production, Chargino, SUPERSYMMETRIC PARTICLES, Neutralino, MONTE-CARLO PROGRAM, TEV, Engineering (miscellaneous), Minimal Supersymmetric Standard Model
Abstract: A search for charginos and neutralinos, predicted by supersymmetric theories, is performed using a data sample of 182.1 pb-1 taken at a centre-of-mass energy of 189 GeV with the OPAL detector at LEP. No evidence for chargino or neutralino production is found. Upper limits on chargino and neutralino pair production (X1+X1-, X10X20) cross-sections are obtained as a function of the chargino mass (mX1±), the lightest neutralino mass (mX10) and the second lightest neutralino mass (mX20). Within the Constrained Minimal Supersymmetric Standard Model framework, and for mX1± - mX10 ≥ 5 GeV, the 95% confidence level lower limits on mX1± are 93.6 GeV for tan β = 1.5 and 94.1 GeV for tan β = 35. These limits are obtained assuming a universal scalar mass m0 ≥ 500 GeV. The corresponding limits for all m0 are 78.0 and 71.7 GeV. The 95% confidence level lower limits on the lightest neutralino mass, valid for any value of tan β are 32.8 GeV for m0 ≥ 500 GeV and 31.6 GeV for all m0.
Published: 1998

189. Search for charged Higgs bosons in e(+)e(-) collisions at root s = 130-172 GeV

Author: Silvia Arcelli, H. O. Ogren, Christoph Geich-Gimbel, J. Lauber, R. W. Springer, S. Baumann, E. A. Mckigney, Vakhtang Kartvelishvili, S. M. Gascon-Shotkin, K. Stoll, Andris Skuja, R. Davis, W. P. Lai, S. D. Talbot, S. Petzold, J. E. Conboy, A. Fürtjes, A. D. Schaile, W. R. Gibson, Gabriella Pasztor, P. Vannerem, D. Eatough, M. Schumacher, E. Lefebvre, E. Tsur, Tetsuro Mashimo, Lutz Feld, J. M. Roney, D. Lui, D. I. Futyan, F. Odorici, Matthew Evans, A. M. Rossi, G. A. Snow, C. P. Ward, M. Verzocchi, K. W. Bell, J. Pálinkás, C. Y. Chang, P. Taras, H. A. Neal, S. Söldner-Rembold, Michael Kobel, W. Gorn, S. Yamashita, J. C. Hill, P. Igo-Kemenes, K. Ishii, H. Jeremie, Richard Teuscher, O. Schaile, J. Grunhaus, Erez Etzion, S. Betts, M. Hapke, H. M. Fischer, Sven Menke, Dave Charlton, Stefan Kluth, M. A. Thomson, A. S. Turcot, E. K. U. Gross, Ehud Duchovni, Allen Mincer, F. Fiedler, Julie Kirk, P. G. Estabrooks, W. J. McDonald, B. C. Shen, Claire Shepherd-Themistocleous, R. K. Keeler, Shlomit Tarem, D. E. Hutchcroft, A. J. Martin, M. Boutemeur, F. S. Merritt, R. Bürgin, S. D. Bird, M. Jimack, M. Sproston, J. Letts, R. J. Hemingway, N. K. Watson, A. Michelini, Siegfried Bethke, B. W. Kennedy, L. Brigliadori, Sachio Komamiya, A. K. Honma, R. M. Brown, Lorne Levinson, M. J. Oreglia, P. Jovanovic, W. G. Scott, K. Sachs, Austin Ball, Theodoros Geralis, Daniel Lellouch, A. T. Watson, P. M. Watkins, I. Nakamura, D. Axen, A. Jawahery, Peter Krieger, Shlomo Dado, A. A. Faust, James Pinfold, R. Perez-Ochoa, Gideon Bella, M. Kolrep, H. J. Burckhart, S. A. Robins, T. Kobayashi, Takehiko Mori, D. G. Fong, H. Mes, I. P. Duerdoth, T. P. Kokott, J. Gascon, Alessandro Montanari, P. Mättig, S. Braibant, Jacqueline Batley, J. Bechtluft, T. Saeki, Peter Sherwood, K. Ackerstaff, U. Jost, R. Mir, R. Hawkings, C. K. Hargrove, V. Zacek, W. M. Sang, Alessandra Fanfani, Alexander Wagner, J. A. McKenna, A. Skillman, S. W. O'Neale, G. Azuelos, Tara Shears, Randall Sobie, G. D. Lafferty, Satoshi Mihara, T. Behnke, Giora Mikenberg, S. F. Ashby, K. J. Anderson, J. R. Carter, G. N. Patrick, J. W. Gary, N. I. Geddes, Michael Hildreth, D. Glenzinski, Dezso Horvath, D. S. Koetke, R. Kowalewski, M. J. Losty, J. Schieck, W. Mohr, Raimund Ströhmer, P. Hüntemeyer, Marcello Mannelli, C. R. Jones, J. Ludwig, P. A. Hart, K. Runge, P. Bock, Guenter Duckeck, N. L. Rodning, Jean-Arcady Meyer, F. G. Oakham, B. Schmitt, E. L. Barberio, A. Posthaus, B. Poli, P. Poffenberger, Otmar Biebel, P. Scharff-Hansen, I. J. Bloodworth, A. Macchiolo, A. Joly, C. Dallapiccola, J. Goldberg, Gideon Alexander, Paolo Capiluppi, C. M. Hawkes, S. B. Anderson, R. L. Coxe, P. Szymanski, B. Nellen, M. F. Turner-Watson, Peter R Hobson, N. Altekamp, H. Voss, A. M. Smith, P. Gagnon, R. J. Barlow, Beatrix Dienes, C. Sbarra, D. J. Miller, Yoram Rozen, F. Scharf, A. Hocker, Richard Nisius, K. Stephens, P. I. Kayal, D. Zer-Zion, Stan Bentvelsen, P. Routenburg, German Martinez, D. Chrisman, G. D. Long, B. List, M. Foucher, John Allison, Marco Cuffiani, Volker Blobel, H. G. Evans, M. Fierro, M. J. Goodrick, I. Cohen, A. Sittler, Peter Schleper, Junichi Kanzaki, D. Karlen, V. Gibson, Reda Tafirout, Klaus Kurt Desch, Zoltan Laszlo Trocsanyi, G. Yekutieli, Norbert Wermes, Sherry Towers, T. Kawamoto, Christoph Rembser, E. Torrence, Stefan Schmitt, S. Orito, R. G. Kellogg, Csaba Hajdu, P. E.L. Clarke, T. R. Junk, M. K. Jones, Stefano Marcellini, Stephen Lloyd, Shoji Asai, Ekg Sarkisyan, B. Stockhausen, Paul Kyberd, P. W. Jeffreys, J. P. Martin, F. K. Loebinger, I. Trigger, Matthias Schröder, J. Steuerer, Ivor Fleck, Joleen Pater, A. Klier, R. Giacomelli, D. R. Ward, A. Oh, T. Kress, S. De Jong, C. Hartmann, D. E. Plane, Stephen Hillier, U. Ruppel, G. M. Dallavalle, M. Thiergen, D. M. Gingrich, A. A. Carter, Ron Folman, Paolo Giacomelli, M. Hansroul, P. Vikas, D. Lanske, P. Utzat, S. R. Lautenschlager, A. Biguzzi, A. Rooke, C. Burgard, R. J. Homer, O. Runolfsson, J. G. Layter, Claudio Grandi, T. J. McMahon, O. C. Cooke, P. Pfeifenschneider, C. Couyoumtzelis, J. Patt, André Schöning, O. Sahr, R. K. Carnegie, M. Herndon, M. Bobinski, J. A. Wilson, R. Lahmann, D. C. Imrie, D. Lazic, Daniele Bonacorsi, G. P. Siroli, Christoph Schwick, J. von Krogh, G. G. Hanson, M. Gruwé, L. A. del Pozo, G. Giacomelli, I. Lawson, Kiyotomo Kawagoe, A. De Roeck, M. S. Dixit, Frans Meijers, K. R. Hossain, K. Nagai, D. R. Rust, A. M. Lee, E. von Törne, R. Van Kooten, F. Wäckerle, M. Fanti, Robert McPherson, Mathieu Doucet, R. D. Heuer, Fabrizio Fabbri, A. Macpherson, R. Howard, J. S. White, Ikuo Ueda, D. M. Strom, P. S. Wells, Terry Richard Wyatt, N. J. Oldershaw, S. Robertson, Gregor Herten, J. E. Pilcher, G. W. Wilson, M. Hauschild, C. Markopoulos, C. Markus, E. H. Vokurka, and R. Bartoldus
Subjects: Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, Microvertex Detector, FOS: Physical sciences, 01 natural sciences, 7. Clean energy, High-Energies, Lower limit, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, 010306 general physics, Boson, Physics, Luminosity (scattering theory), 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, Monte-Carlo Program, LEP, Higgs boson, Couplings, High Energy Physics::Experiment, Decays, Cross-Sections, Particle Physics - Experiment
Abstract: A search is described to detect charged Higgs bosons via the process e^+e^- -> H^+H^-, using data collected by the OPAL detector at center-of-mass energies of 130-172 GeV with a total integrated luminosity of 25 pb^-1. The decay channels are assumed to be H^+ -> qq'(bar) and H^+ -> \tau^+ \nu_{\tau}. No evidence for charged Higgs boson production is observed. The lower limit for its mass is determined to be 52 GeV at 95% confidence level, independent of the H^+ -> \tau^+ \nu_{\tau} branching ratio., Comment: 19 pages, LaTeX, uses a4p.sty, 3 eps figures included, submitted to Phys. Lett. B
Published: 1998

190. First measurement of Z/gamma* production in Compton scattering of quasi-real photons

Author: K. Sachs, J. Goldberg, Shlomo Dado, Daniel Lellouch, Gideon Bella, J. Grunhaus, H. J. Burckhart, Giora Mikenberg, Jacqueline Batley, Stefan Schmitt, S. F. Ashby, B. Nellen, Shoji Asai, W. J. McDonald, B. C. Shen, S. D. Bird, Raimund Ströhmer, Otmar Biebel, Takehiko Mori, P. Mättig, H. A. Neal, Richard Teuscher, D. Axen, A. Jawahery, D. R. Rust, C. R. Jones, A. S. Turcot, F. Fiedler, A. D. Schaile, Gabriella Pasztor, H. G. Evans, G. Gaycken, I. J. Bloodworth, C. Hartmann, D. E. Plane, P. G. Bright-Thomas, I. Cohen, Peter Sherwood, Siegfried Bethke, P. I. Kayal, M. Schumacher, Stephen Hillier, Alexander Wagner, S. Yamashita, P. Vannerem, P. Igo-Kemenes, J. Ludwig, G. M. Dallavalle, K. Runge, M. A. Thomson, P. Poffenberger, P. Bock, Christoph Rembser, S. M. Gascon-Shotkin, F. Odorici, Yoram Rozen, E. K. U. Gross, K. Ishii, H. Jeremie, J. Letts, M. Sproston, P. Gagnon, Norbert Wermes, Sherry Towers, T. Kawamoto, J. Polok, Dave Charlton, G. A. Snow, C. P. Ward, D. Karlen, M. Fierro, R. Bartoldus, Beatrix Dienes, A. K. Honma, W. G. Scott, I. Nakamura, Erez Etzion, S. Orito, S. Söldner-Rembold, O. Schaile, A. Sittler, T. Seiler, R. Bürgin, Zoltan Laszlo Trocsanyi, M. Kolrep, Stefan Kluth, Ekg Sarkisyan, S. Betts, M. Hapke, S. Robertson, D. Liu, S. Baumann, Sachio Komamiya, Shlomit Tarem, A. T. Watson, W. R. Gibson, J. M. Roney, K. Harder, H. Mes, I. P. Duerdoth, Sven Menke, C. Y. Chang, J. Lauber, A. M. Rossi, E. A. Mckigney, S. Braibant, M. J. Oreglia, T. P. Kokott, S. D. Talbot, R. M. Brown, Lorne Levinson, Ehud Duchovni, Koichi Nagai, J. Schieck, W. Mohr, J. R. Carter, B. Surrow, T. Saeki, Christoph Geich-Gimbel, P. Taras, D. Glenzinski, S. A. Robins, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, P. Hüntemeyer, Stan Bentvelsen, H. O. Ogren, G. N. Patrick, Paul Kyberd, D. I. Futyan, F. K. Loebinger, L. Brigliadori, D. Lanske, K. Roscoe, S. R. Lautenschlager, R. Davis, R. Liebisch, K. Ackerstaff, S. W. O'Neale, K. J. Anderson, Klaus Kurt Desch, M. Jimack, P. G. Estabrooks, R. K. Keeler, O. Runolfsson, E. Torrence, E. Clay, Kiyotomo Kawagoe, N. K. Watson, Randall Sobie, G. D. Lafferty, F. Scharf, German Martinez, Claudia Ciocca, Claudio Grandi, J. S. White, J. Steuerer, Ivor Fleck, P. M. Watkins, Guenter Duckeck, Michael Hildreth, A. Michelini, Alain Bellerive, N. L. Rodning, S. Anderson, Joleen Pater, K. R. Hossain, Georges Azuelos, E. Tsur, A. Klier, D. C. Imrie, M. Verzocchi, K. W. Bell, J. Pálinkás, Satoshi Tanaka, T. Kobayashi, G. P. Siroli, J. C. Hill, Christoph Schwick, Vakhtang Kartvelishvili, R. L. Coxe, Satoshi Mihara, M. F. Turner-Watson, Peter R Hobson, J. E. Conboy, A. Fürtjes, A. Hocker, John Allison, D. Zer-Zion, D. Chrisman, G. D. Long, K. Stephens, Volker Blobel, C. Littlewood, R. G. Kellogg, V. Gibson, Stefano Marcellini, Stephen Lloyd, W. M. Sang, Paolo Giacomelli, M. Boutemeur, F. S. Merritt, M. Hansroul, I. Trigger, M. Fanti, C. Burgard, D. R. Ward, T. Kress, R. J. Homer, R. Kowalewski, S. Arcelli, T. R. Junk, C. Sbarra, Robert McPherson, F. R. Jacob, J. Bechtluft, Gideon Alexander, R. D. Heuer, A. W. Lloyd, P. S. Wells, Paolo Capiluppi, O. C. Cooke, J. A. McKenna, Fabrizio Fabbri, P. Pfeifenschneider, G. W. Wilson, M. Hauschild, C. Markopoulos, P. Scharff-Hansen, J. Patt, André Schöning, T. J. McMahon, C. Couyoumtzelis, J. Dubbert, R. K. Carnegie, M. Herndon, M. Bobinski, J. A. Wilson, J. Böhme, O. Sahr, D. Lazic, Terry Richard Wyatt, A. M. Lee, E. von Törne, Daniele Bonacorsi, A. M. Smith, J. von Krogh, F. Wäckerle, D. M. Gingrich, Achim Stahl, M. Gruwé, L. A. del Pozo, Gregor Herten, K. Stoll, A. J. Martin, G. Yekutieli, Andris Skuja, A. Macpherson, M. Przybycień, S. Petzold, W. Mader, C. K. Hargrove, J. E. Pilcher, Matthias Schröder, G. G. Hanson, A. A. Carter, Ron Folman, M. Thiergen, G. Giacomelli, I. Lawson, Tetsuro Mashimo, R. J. Hemingway, A. De Roeck, M. Kobel, R. Van Kooten, M. S. Dixit, Frans Meijers, Tara Shears, Giovanni Abbiendi, P. E.L. Clarke, B. W. Kennedy, J. P. Martin, P. Jovanovic, W. Gorn, S. De Jong, Austin Ball, Peter Krieger, R. Howard, H. Rick, Alessandro Montanari, A. Biguzzi, J. G. Layter, R. Mir, R. Hawkings, James Pinfold, D. M. Strom, R. Perez-Ochoa, R. Seuster, D. Eatough, T. Behnke, J. Gascon, V. Zacek, A. Macchiolo, J. W. Gary, F. G. Oakham, C. M. Hawkes, D. S. Koetke, Marcello Mannelli, B. Schmitt, E. L. Barberio, T. Kuhl, Richard Nisius, B. List, Marco Cuffiani, N. Altekamp, H. Voss, R. J. Barlow, D. J. Miller, Claire Shepherd-Themistocleous, and A. A. Faust
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, 010308 nuclear & particles physics, Branching fraction, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Monte Carlo method, Compton scattering, FOS: Physical sciences, Electron, 7. Clean energy, 01 natural sciences, 3. Good health, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, Event (particle physics), Particle Physics - Experiment, Boson
Abstract: We report the first observation of Z/gamma* production in Compton scattering of quasi-real photons. This is a subprocess of the reaction e+e- to e+e-Z/gamma*, where one of the final state electrons is undetected. Approximately 55 pb-1 of data collected in the year 1997 at an e+e- centre-of-mass energy of 183 GeV with the OPAL detector at LEP have been analysed. The Z/gamma* from Compton scattering has been detected in the hadronic decay channel. Within well defined kinematic bounds, we measure the product of cross-section and Z/gamma* branching ratio to hadrons to be (0.9+-0.3+-0.1) pb for events with a hadronic mass larger than 60 GeV, dominated by (e)eZ production. In the hadronic mass region between 5 GeV and 60 GeV, dominated by (e)egamma* production, this product is found to be (4.1+-1.6+-0.6) pb. Our results agree with the predictions of two Monte Carlo event generators, grc4f and PYTHIA., Comment: 18 pages, LaTeX, 5 eps figures included, submitted to Physics Letters B
Published: 1998

191. Photon and light meson production in hadronic Z(0) decays

Author: Paul Kyberd, F. K. Loebinger, J. Steuerer, Ivor Fleck, Joleen Pater, A. Klier, R. Mir, John Allison, R. Hawkings, S. Yamashita, P. Igo-Kemenes, R. G. Kellogg, Stefano Marcellini, W. M. Sang, K. Ishii, H. Jeremie, A. Joly, C. Sbarra, F. R. Jacob, T. Behnke, James Pinfold, F. G. Oakham, R. Perez-Ochoa, R. Seuster, B. Schmitt, E. L. Barberio, O. Schaile, J. Gascon, A. Macchiolo, C. M. Hawkes, Otmar Biebel, R. J. Hemingway, P. E.L. Clarke, J. W. Gary, Sven Menke, J. P. Martin, M. F. Turner-Watson, Richard Nisius, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, D. S. Koetke, Peter R Hobson, Marcello Mannelli, D. Zer-Zion, S. De Jong, K. Stoll, Andris Skuja, B. List, P. I. Kayal, Marco Cuffiani, Alessandro Montanari, S. Petzold, H. Rick, Tetsuro Mashimo, J. Grunhaus, Georges Azuelos, E. Tsur, R. L. Coxe, N. Altekamp, H. Voss, Norbert Wermes, Sherry Towers, R. J. Barlow, S. B. Anderson, T. Kawamoto, J. Lauber, D. J. Miller, A. Hocker, M. Verzocchi, K. W. Bell, J. Pálinkás, S. D. Talbot, Sachio Komamiya, Theodoros Geralis, S. Orito, J. Goldberg, A. T. Watson, Claire Shepherd-Themistocleous, D. Chrisman, G. D. Long, Volker Blobel, W. Gorn, Stefan Schmitt, D. Eatough, J. C. Hill, W. J. McDonald, B. C. Shen, T. P. Kokott, O. C. Cooke, S. Betts, M. Hapke, G. W. Wilson, Stan Bentvelsen, J. Letts, P. Pfeifenschneider, T. Saeki, B. Nellen, Siegfried Bethke, A. K. Honma, Alessandra Fanfani, W. G. Scott, I. Nakamura, Stephen Lloyd, J. von Krogh, A. A. Faust, J. Patt, André Schöning, M. Przybzien, M. A. Thomson, S. D. Bird, M. Boutemeur, F. S. Merritt, G. G. Hanson, P. Scharff-Hansen, M. Gruwé, M. J. Oreglia, L. A. del Pozo, D. Axen, O. Sahr, A. Jawahery, J. Bechtluft, E. K. U. Gross, D. Glenzinski, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, Randall Sobie, K. Sachs, Shlomo Dado, J. A. McKenna, S. R. Lautenschlager, Ehud Duchovni, G. Yekutieli, Peter Sherwood, H. G. Evans, I. Cohen, Christoph Rembser, A. M. Smith, Alexander Wagner, M. Sproston, G. D. Lafferty, Tara Shears, G. Giacomelli, I. Lawson, J. Ludwig, M. Jimack, A. A. Carter, Ron Folman, K. Runge, P. Bock, J. R. Carter, G. N. Patrick, A. Michelini, R. Bartoldus, H. O. Ogren, Christoph Geich-Gimbel, Shoji Asai, P. Gagnon, Erez Etzion, A. De Roeck, Achim Stahl, R. Davis, P. G. Bright-Thomas, A. Sittler, Giora Mikenberg, S. F. Ashby, Kiyotomo Kawagoe, O. Runolfsson, Stefan Kluth, Guenter Duckeck, T. J. McMahon, Satoshi Tanaka, T. Kobayashi, M. Schumacher, Vakhtang Kartvelishvili, J. E. Conboy, Zoltan Laszlo Trocsanyi, Daniel Lellouch, Shlomit Tarem, E. Lefebvre, C. Couyoumtzelis, A. Fürtjes, J. Dubbert, R. K. Carnegie, M. S. Dixit, M. Herndon, Frans Meijers, Takehiko Mori, M. Bobinski, Richard Teuscher, A. S. Turcot, F. Fiedler, J. A. Wilson, J. Böhme, P. Mättig, F. Odorici, A. D. Schaile, Gabriella Pasztor, P. Vannerem, M. Kobel, A. Biguzzi, V. Zacek, H. A. Neal, S. A. Robins, D. Lui, D. Lazic, R. Liebisch, K. Ackerstaff, Claudio Grandi, R. Kowalewski, J. G. Layter, G. A. Snow, C. P. Ward, I. J. Bloodworth, M. Kolrep, T. Schorner, S. Söldner-Rembold, H. Mes, I. P. Duerdoth, Paolo Giacomelli, M. Hansroul, K. R. Hossain, Yoram Rozen, S. Braibant, P. Hüntemeyer, Gideon Alexander, J. Polok, Paolo Capiluppi, D. Karlen, C. Burgard, R. J. Homer, F. Scharf, German Martinez, M. Fierro, Ekg Sarkisyan, P. Vikas, D. Lanske, D. C. Imrie, G. P. Siroli, Christoph Schwick, Silvia Arcelli, J. Schieck, S. Baumann, W. Mohr, E. A. Mckigney, K. Stephens, C. Littlewood, J. M. Roney, K. Roscoe, D. I. Futyan, V. Gibson, T. R. Junk, P. G. Estabrooks, R. K. Keeler, N. K. Watson, I. Trigger, Reda Tafirout, Klaus Kurt Desch, P. M. Watkins, D. R. Ward, T. Kress, E. Torrence, E. Clay, Satoshi Mihara, Dave Charlton, R. Bürgin, Gideon Bella, H. J. Burckhart, Jacqueline Batley, W. R. Gibson, C. R. Jones, K. Nagai, D. R. Rust, A. M. Lee, E. von Törne, R. Van Kooten, R. M. Brown, Lorne Levinson, F. Wäckerle, D. M. Gingrich, M. Fanti, Robert McPherson, Mathieu Doucet, R. D. Heuer, Fabrizio Fabbri, C. Hartmann, D. E. Plane, Stephen Hillier, G. M. Dallavalle, Michael Hildreth, N. L. Rodning, B. Poli, S. M. Gascon-Shotkin, A. M. Rossi, H. M. Fischer, Claudia Ciocca, P. S. Wells, Terry Richard Wyatt, A. Macpherson, R. Howard, J. S. White, D. M. Strom, C. Y. Chang, P. Taras, Raimund Ströhmer, P. Poffenberger, Beatrix Dienes, S. W. O'Neale, K. J. Anderson, A. W. Lloyd, M. Hauschild, C. Markopoulos, S. Robertson, Gregor Herten, J. E. Pilcher, A. J. Martin, C. K. Hargrove, Matthias Schröder, and M. Thiergen
Subjects: Physics, Line-Shape, Particle physics, Photon, Meson production, Jet Fragmentation, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Hadron, Inclusive Production, LEP, E+E-Physics, Detector, Lep, Omega, Nuclear physics, Lund Monte-Carlo, Production (computer science), Bose-Einstein Correlations, Z0 Decays, Engineering (miscellaneous), Energy (signal processing), Particle Physics - Experiment, Simulation
Abstract: The inclusive production rates and differential cross-sections of photons and mesons with a final state containing photons have been measured with the OPAL detector at LEP. The light mesons covered by the measurements are the \pi^0, multiplicities per hadronic Z^0 decay, extrapolated to the full energy range, are: = 20.97 +/- 0.02 +/- 1.15, = 9.55 +/- 0.06 +/- 0.75, = 0.97 +/- 0.03 +/- 0.11, = 2.40 +/- 0.06 +/- 0.43, = 1.04 +/- 0.04 +/- 0.14, = 0.14 +/- 0.01 +/- 0.02, = 0.27 +/- 0.04 +/- 0.10. where the first errors are statistical and the second systematic. In general, the results are in agreement with the predictions of the JETSET and HERWIG Monte Carlo models. The inclusive production rates and differential cross-sections of photons and mesons with a final state containing photons have been measured with the OPAL detector at LEP. The light mesons covered by the measurements are the \pi^0, \eta, \rho(770)+-, \omega(782), \eta'(958) and a_0(980)+-. The particle multiplicities per hadronic Z^0 decay, extrapolated to the full energy range, are: = 20.97 +/- 0.02 +/- 1.15, = 9.55 +/- 0.06 +/- 0.75, = 0.97 +/- 0.03 +/- 0.11, = 2.40 +/- 0.06 +/- 0.43, = 1.04 +/- 0.04 +/- 0.14, = 0.14 +/- 0.01 +/- 0.02, = 0.27 +/- 0.04 +/- 0.10. where the first errors are statistical and the second systematic. In general, the results are in agreement with the predictions of the JETSET and HERWIG Monte Carlo models. The inclusive production rates and differential cross-sections of photons and mesons with a final state containing photons have been measured with the OPAL detector at LEP. The light mesons covered by the measurements are the \pi^0, \eta, \rho(770)+-, \omega(782), \eta'(958) and a_0(980)+-. The particle multiplicities per hadronic Z^0 decay, extrapolated to the full energy range, are: = 20.97 +/- 0.02 +/- 1.15, = 9.55 +/- 0.06 +/- 0.75, = 0.97 +/- 0.03 +/- 0.11, = 2.40 +/- 0.06 +/- 0.43, = 1.04 +/- 0.04 +/- 0.14, = 0.14 +/- 0.01 +/- 0.02, = 0.27 +/- 0.04 +/- 0.10. where the first errors are statistical and the second systematic. In general, the results are in agreement with the predictions of the JETSET and HERWIG Monte Carlo models. The inclusive production rates and differential cross-sections of photons and mesons with a final state containing photons have been measured with the OPAL detector at LEP. The light mesons covered by the measurements are the \pi^0, \eta, \rho(770)+-, \omega(782), \eta'(958) and a_0(980)+-. The particle multiplicities per hadronic Z^0 decay, extrapolated to the full energy range, are: = 20.97 +/- 0.02 +/- 1.15, = 9.55 +/- 0.06 +/- 0.75, = 0.97 +/- 0.03 +/- 0.11, = 2.40 +/- 0.06 +/- 0.43, = 1.04 +/- 0.04 +/- 0.14, = 0.14 +/- 0.01 +/- 0.02, = 0.27 +/- 0.04 +/- 0.10. where the first errors are statistical and the second systematic. In general, the results are in agreement with the predictions of the JETSET and HERWIG Monte Carlo models.
Published: 1998

192. Enhancement of central Λ, Ξ and yields in Pb-Pb collisions at 158 A GeV/c

Author: A. Kirk, M.T. Muciaccia, Giorgio Torrieri, A. Singovski, G. Grella, F. Navach, J.B. Kinson, F. Posa, Jean-Charles Fontaine, David H. Evans, S. Szafran, B.T.H. Knudsen, Michele Guida, S. Simone, E. Andersen, Eugenio Cantatore, Federico Antinori, Trine Spedstad Tveter, R.A. Loconsole, M. G. Catanesi, M. Morando, Petr Zavada, B. Ghidini, M. Dameri, Rocco Caliandro, P.I. Norman, Michael A. Thompson, Erik H.M. Heijne, S. Saladino, N. Carrer, G. T. Jones, H. Bakke, W. Beusch, H. Rotscheidt, K. Piska, Gunnar Løvhøiden, A.K. Holme, Anton Jusko, M. Sené, M. Campbell, A. Diaczek, M.E. Michalon-Mentzer, I. J. Bloodworth, V. Lenti, D. Huss, P. Jovanovic, R. A. Fini, Dario Barberis, T. Virgili, H. Beker, P. Middelkamp, O. Villalobos Baillie, R. A. Ricci, K. Fanebust, E. Nappi, J. Urban, A. Michalon, T. Kachelhoffer, J. Bohm, A. Volte, B.C. Earl, I. Králik, N. Armenise, M.A. Mazzoni, Walter Snoeys, Davide Elia, M. Venables, V. Mack, Vito Manzari, R. Lietava, R. Sené, M. Luptak, G.F. Segato, Domenico Di Bari, Paolo Martinengo, K. Knudson, G. Tomasicchio, L. Šándor, A. Jacholkowski, F. Pellegrini, E. Quercigh, Franco Meddi, V.A. Kachanov, G. Romano, M.F. Votruba, T. Scognetti, W. Klempt, G. Rosa, Pavel Staroba, T.F. Thorsteinsen, Haavard Helstrup, J. Bán, Giovanni Darbo, E. Chesi, Bianca Osculati, K. Šafařík, Leonardo Paolo Rossi, G. Vassiliadis, C. Salvo, J. C. Lassalle, S. Di Liberto, B. Pastirčák, and J. Ftacnik
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Nuclear Theory, Hyperon, Hyperons, Strangeness, 01 natural sciences, Spectral line, Nuclear physics, 0103 physical sciences, Quark–gluon plasma, Transverse mass, Quark Gluon Plasma, Nuclear Experiment, 010306 general physics
Abstract: Λ, Ξ and Ω yields and transverse mass spectra have been measured in Pb-Pb and p-Pb collisions at 158 A GeV/c. The yields in Pb-Pb interactions are presented as a function of the collision centrality and compared with those obtained from p-Pb collisions. Strangeness enhancement is observed which increases with centrality and with the strangeness content of the hyperon.
Published: 1998

193. Search for a massive diphoton resonance at $\sqrt{s}$ = 91-172 GeV

Author: James Pinfold, R. Perez-Ochoa, D. G. Fong, Gunter Wolf, R. Bartoldus, K. Ackerstaff, Kiyotomo Kawagoe, J. Gascon, H. O. Ogren, V. Zacek, Christoph Geich-Gimbel, Satoshi Mihara, J. W. Gary, D. S. Koetke, Marcello Mannelli, K. R. Hossain, Matthias Schröder, S. Yamashita, P. Igo-Kemenes, Vakhtang Kartvelishvili, K. Ishii, H. Jeremie, S. Braibant, P. Scharff-Hansen, A. D. Schaile, J. Lauber, M. Thiergen, J. E. Conboy, T. Behnke, Gabriella Pasztor, J. Goldberg, A. Fürtjes, R. Lahmann, Dave Charlton, D. C. Imrie, R. W. Springer, O. Schaile, B. Nellen, Ehud Duchovni, E. do Couto e Silva, U. Ruppel, Daniele Bonacorsi, M. R. Ingram, I. J. Bloodworth, A. M. Smith, R. Bürgin, Silvia Arcelli, Georges Azuelos, E. Tsur, A. Macchiolo, G. P. Siroli, S. D. Talbot, M. Verzocchi, R. Davis, K. W. Bell, J. Pálinkás, J. C. Hill, Christoph Schwick, M. Jimack, M. Gruwé, C. M. Hawkes, H. G. Evans, M. Schumacher, E. Lefebvre, D. Eatough, A. Michelini, M. J. Goodrick, Hans-Christian Schultz-Coulon, Randall Sobie, I. Cohen, Sven Menke, Gideon Bella, K. Stoll, M. Boutemeur, F. S. Merritt, Andris Skuja, S. Petzold, F. Odorici, Yoram Rozen, M. Foucher, K. Stephens, G. D. Lafferty, Richard Nisius, J. von Krogh, H. J. Burckhart, Jacqueline Batley, C. Y. Chang, S. Baumann, U. Müller, Satoshi Tanaka, T. Kobayashi, Marco Cuffiani, S. D. Bird, Paolo Giacomelli, C. Dallapiccola, M. Hansroul, Tetsuro Mashimo, E. A. Mckigney, V. Gibson, A. J. Martin, D. Karlen, P. Schenk, T. R. Junk, C. R. Jones, J. Bechtluft, C. Burgard, W. P. Lai, Stefan Kluth, P. Taras, I. Trigger, L. A. del Pozo, D. Axen, Shlomit Tarem, J. A. McKenna, R. J. Homer, A. Jawahery, Michael Kobel, D. R. Ward, T. Kress, Stefan Schmitt, J. M. Roney, O. C. Cooke, Peter Sherwood, P. Pfeifenschneider, N. Altekamp, H. Voss, D. Chrisman, G. D. Long, Volker Blobel, Claire Shepherd-Themistocleous, H. Mes, R. J. Barlow, I. P. Duerdoth, W. Gorn, Guenter Duckeck, D. I. Futyan, W. J. McDonald, C. K. Hargrove, B. C. Shen, J. Patt, André Schöning, Siegfried Bethke, A. K. Honma, Alexander Wagner, W. G. Scott, I. Nakamura, D. M. Strom, D. Glenzinski, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, G. Yekutieli, Allen Mincer, D. J. Miller, Julie Kirk, Tara Shears, J. Ludwig, K. Runge, P. Bock, P. Mättig, A. A. Faust, J. Schieck, Stephen Lloyd, Shoji Asai, A. A. Carter, P. A. Hart, Ron Folman, W. Mohr, P. Hüntemeyer, R. Rylko, Daniel Lellouch, D. Rigby, R. J. Hemingway, A. Posthaus, Takehiko Mori, M. J. Pearce, B. W. Kennedy, P. Jovanovic, P. Utzat, Austin Ball, P. Poffenberger, Peter Krieger, S. B. Anderson, P. Szymanski, Alessandro Montanari, P. Gagnon, U. Jost, R. Mir, R. Hawkings, T. J. McMahon, F. G. Oakham, B. Schmitt, R. K. Carnegie, D. L. Rees, E. L. Barberio, M. Herndon, M. Bobinski, J. A. Wilson, Beatrix Dienes, Gideon Alexander, Paolo Capiluppi, Reda Tafirout, Klaus Kurt Desch, L. Brigliadori, F. Scharf, D. Lazic, A. Sittler, German Martinez, Stan Bentvelsen, Peter Schleper, S. W. O'Neale, K. J. Anderson, Zoltan Laszlo Trocsanyi, M. A. Thomson, E. K. U. Gross, Richard Teuscher, M. Sproston, A. S. Turcot, F. Fiedler, M. Kolrep, W. R. Gibson, B. T. Bouwens, R. M. Brown, Lorne Levinson, A. Skillman, C. Hartmann, D. E. Plane, Stephen Hillier, G. M. Dallavalle, B. Stockhausen, Paul Kyberd, F. K. Loebinger, J. Steuerer, Ivor Fleck, Joleen Pater, A. Klier, R. Giacomelli, A. Oh, H. M. Fischer, N. I. Geddes, Michael Hildreth, N. L. Rodning, R. Van Kooten, B. Poli, S. M. Gascon-Shotkin, F. Wäckerle, D. M. Gingrich, Matthew Evans, A. M. Rossi, M. Fierro, J. E.G. Edwards, S. R. Lautenschlager, H. A. Neal, A. Joly, M. F. Turner-Watson, M. Morii, Peter R Hobson, D. Zer-Zion, P. Routenburg, O. Runolfsson, Sachio Komamiya, Theodoros Geralis, E. Ros, A. T. Watson, K. Nagai, T. P. Kokott, T. Saeki, C. Beeston, Claudio Grandi, Ekg Sarkisyan, D. R. Rust, C. Sbarra, J. Grunhaus, P. W. Jeffreys, A. M. Lee, E. von Törne, P. Vikas, D. Lanske, John Allison, M. Fanti, P. G. Estabrooks, R. K. Keeler, N. K. Watson, P. M. Watkins, R. G. Kellogg, Robert McPherson, Csaba Hajdu, Mathieu Doucet, R. D. Heuer, Stefano Marcellini, Fabrizio Fabbri, G. A. Snow, C. P. Ward, S. Söldner-Rembold, P. S. Wells, Terry Richard Wyatt, J. E. Bloomer, A. Macpherson, J. Letts, K. Sachs, Shlomo Dado, Giora Mikenberg, R. Howard, J. S. White, S. Robertson, Gregor Herten, B. Wilkens, J. E. Pilcher, N. J. Oldershaw, G. W. Wilson, M. Hauschild, C. Markus, G. T. Jones, E. H. Vokurka, M. Hapke, D. E. Hutchcroft, M. J. Oreglia, J. R. Carter, G. N. Patrick, Otmar Biebel, P. I. Kayal, Norbert Wermes, Sherry Towers, T. Kawamoto, S. Orito, P. E.L. Clarke, M. K. Jones, J. P. Martin, S. De Jong, A. N. Bell, G. G. Hanson, G. Giacomelli, M. S. Dixit, Frans Meijers, A. Biguzzi, A. Rooke, J. G. Layter, and S. A. Robins
Subjects: Physics, Particle physics, Gauge boson, Photon, Physics and Astronomy (miscellaneous), Scalar (mathematics), Hadron, High Energy Physics::Phenomenology, Expected value, Resonance (particle physics), Standard Model, Nuclear physics, Higgs boson, High Energy Physics::Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: A search for the resonant production of high mass photon pairs associated with a leptonic or hadronic system has been performed using a total data sample of 25.7 pb^-1 taken at centre-of-mass energies between 130 GeV and 172 GeV with the OPAL detector at LEP. The observed number of events is consistent with the expected number from Standard Model processes. The observed candidates are combined with search results from sqrt{s} ~ M_Z to place limits on Br(H^0 -> gamma gamma) within the Standard Model for Higgs boson masses up to 77 GeV, and on the production cross section of any scalar resonance decaying into di-photons. Upper limits on Br(H^0 -> gamma gamma) x sigma(e^+e^- -> H^0 Z^0) of 290 - 830 fb are obtained over 40 < M_H < 160 GeV. Type-I two-Higgs-doublet scalars which couple only to gauge bosons are ruled out up to a mass of 76.5 GeV at the 95% confidence level. A search for the resonant production of high mass photon pairs associated with a leptonic or hadronic system has been performed using a total data sample of 25.7 pb^-1 taken at centre-of-mass energies between 130 GeV and 172 GeV with the OPAL detector at LEP. The observed number of events is consistent with the expected number from Standard Model processes. The observed candidates are combined with search results from sqrt{s} ~ M_Z to place limits on Br(H^0 -> gamma gamma) within the Standard Model for Higgs boson masses up to 77 GeV, and on the production cross section of any scalar resonance decaying into di-photons. Upper limits on Br(H^0 -> gamma gamma) x sigma(e^+e^- -> H^0 Z^0) of 290 - 830 fb are obtained over 40 < M_H < 160 GeV. Type-I two-Higgs-doublet scalars which couple only to gauge bosons are ruled out up to a mass of 76.5 GeV at the 95% confidence level.
Published: 1997

194. Multiplicity distributions of gluon and quark jets and tests of QCD analytic predictions

Author: Gunter Wolf, K. Ackerstaff, P. G. Estabrooks, Sachio Komamiya, Theodoros Geralis, E. Ros, N. K. Watson, T. P. Kokott, M. Fierro, J. E.G. Edwards, P. M. Watkins, J. Goldberg, B. Nellen, T. Saeki, Otmar Biebel, Ekg Sarkisyan, P. W. Jeffreys, R. Bartoldus, H. G. Evans, Daniele Bonacorsi, Stefan Kluth, Shlomit Tarem, M. J. Goodrick, I. Cohen, H. O. Ogren, Christoph Geich-Gimbel, P. E.L. Clarke, M. K. Jones, R. Davis, R. Van Kooten, S. M. Gascon-Shotkin, P. S. Wells, W. J. McDonald, B. C. Shen, J. Lauber, Satoshi Mihara, Silvia Arcelli, J. P. Martin, P. Vikas, Terry Richard Wyatt, J. E. Bloomer, D. Lanske, Matthew Evans, J. Letts, M. Schumacher, E. Lefebvre, F. Odorici, S. R. Lautenschlager, P. I. Kayal, Siegfried Bethke, A. K. Honma, J. von Krogh, W. G. Scott, I. Nakamura, H. A. Neal, W. R. Gibson, A. M. Rossi, S. Baumann, S. De Jong, A. Macpherson, Vakhtang Kartvelishvili, J. E. Conboy, A. Fürtjes, N. J. Oldershaw, Richard Keeler, James Pinfold, R. Perez-Ochoa, E. A. Mckigney, B. T. Bouwens, S. Yamashita, T. Behnke, O. Runolfsson, P. Igo-Kemenes, Norbert Wermes, Sherry Towers, D. G. Fong, J. Gascon, R. M. Brown, Lorne Levinson, N. I. Geddes, Michael Hildreth, L. A. del Pozo, D. Glenzinski, A. Macchiolo, T. Kawamoto, R. Howard, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, W. P. Lai, J. S. White, F. Wäckerle, C. Beeston, Claudio Grandi, H. Mes, I. P. Duerdoth, M. F. Turner-Watson, M. Morii, Peter R Hobson, D. Zer-Zion, S. D. Talbot, M. Boutemeur, F. S. Merritt, A. N. Bell, P. Routenburg, C. Dallapiccola, A. Joly, A. Skillman, N. L. Rodning, B. Poli, K. Sachs, Shlomo Dado, M. Gruwé, C. M. Hawkes, S. Orito, Richard Nisius, D. M. Gingrich, J. W. Gary, D. S. Koetke, J. Bechtluft, T. J. McMahon, Ehud Duchovni, D. Eatough, P. Poffenberger, J. A. McKenna, U. Ruppel, M. R. Ingram, I. J. Bloodworth, K. Ishii, H. Jeremie, R. K. Carnegie, M. Hapke, Marcello Mannelli, M. Jimack, R. W. Springer, J. Grunhaus, M. Herndon, C. Sbarra, Marco Cuffiani, H. M. Fischer, J. M. Roney, N. Altekamp, H. Voss, D. E. Hutchcroft, Gideon Bella, H. J. Burckhart, Jacqueline Batley, Kiyotomo Kawagoe, P. Hüntemeyer, P. Scharff-Hansen, K. Nagai, M. Bobinski, J. A. Wilson, A. Michelini, G. G. Hanson, Reda Tafirout, Klaus Kurt Desch, R. J. Barlow, S. D. Bird, D. M. Strom, P. Schenk, D. R. Rust, O. Schaile, M. J. Oreglia, D. I. Futyan, Georges Azuelos, E. Tsur, G. Giacomelli, Paolo Giacomelli, D. J. Miller, Claire Shepherd-Themistocleous, G. W. Wilson, E. do Couto e Silva, A. M. Smith, M. Verzocchi, M. Hansroul, K. W. Bell, J. Pálinkás, D. Axen, John Allison, A. Jawahery, M. Hauschild, Satoshi Tanaka, T. Kobayashi, R. Rylko, Giora Mikenberg, J. C. Hill, D. Lazic, J. R. Carter, C. Markus, K. Stoll, Andris Skuja, G. N. Patrick, S. Petzold, C. Hartmann, D. E. Plane, A. M. Lee, M. S. Dixit, Peter Sherwood, Frans Meijers, A. A. Faust, Stephen Hillier, E. von Törne, Tetsuro Mashimo, C. R. Jones, Alexander Wagner, G. M. Dallavalle, Sven Menke, G. T. Jones, K. Stephens, S. Braibant, J. Ludwig, K. Runge, P. Bock, E. H. Vokurka, C. Burgard, A. D. Schaile, G. Yekutieli, Gabriella Pasztor, Alan Watson, W. Gorn, A. Biguzzi, S. B. Anderson, R. G. Kellogg, P. Szymanski, A. Rooke, J. G. Layter, A. A. Carter, Ron Folman, P. Gagnon, Dave Charlton, S. Robertson, Csaba Hajdu, Gregor Herten, D. Rigby, R. J. Hemingway, R. J. Homer, G. A. Snow, C. P. Ward, P. Utzat, V. Gibson, R. Bürgin, B. Wilkens, A. Sittler, Stefano Marcellini, Peter Schleper, Zoltan Laszlo Trocsanyi, J. E. Pilcher, M. Fanti, S. Söldner-Rembold, B. W. Kennedy, P. Jovanovic, Austin Ball, T. R. Junk, Peter Krieger, I. Trigger, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Gideon Alexander, D. R. Ward, Paolo Capiluppi, J. Steuerer, Ivor Fleck, T. Kress, Alessandro Montanari, K. R. Hossain, Joleen Pater, Robert McPherson, O. C. Cooke, A. Klier, U. Jost, R. Mir, R. Giacomelli, P. Pfeifenschneider, D. Chrisman, G. D. Long, Yoram Rozen, R. Hawkings, A. Oh, Volker Blobel, Mathieu Doucet, Stephen Lloyd, R. Lahmann, D. C. Imrie, J. Patt, R. D. Heuer, André Schöning, Fabrizio Fabbri, F. G. Oakham, Stan Bentvelsen, B. Schmitt, E. L. Barberio, G. P. Siroli, Christoph Schwick, M. Foucher, Hans-Christian Schultz-Coulon, Randall Sobie, G. D. Lafferty, Guenter Duckeck, Richard Teuscher, A. S. Turcot, F. Fiedler, D. Karlen, M. Kolrep, Stefan Schmitt, Beatrix Dienes, P. Mättig, C. Y. Chang, Shoji Asai, P. Taras, Daniel Lellouch, Michael Kobel, Allen Mincer, Julie Kirk, Takehiko Mori, L. Brigliadori, S. W. O'Neale, K. J. Anderson, V. Zacek, Tara Shears, P. A. Hart, M. J. Pearce, U. Müller, A. J. Martin, C. K. Hargrove, Matthias Schröder, M. Thiergen, J. Schieck, W. Mohr, A. Posthaus, M. A. Thomson, E. K. U. Gross, M. Sproston, D. L. Rees, F. Scharf, German Martinez, and S. A. Robins
Subjects: Quark, Particle physics, E+E ANNIHILATION, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Lattice, Hadron, Nuclear Theory, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, CUMULANT MOMENTS, 010306 general physics, Engineering (miscellaneous), NON-LEADING TERMS, Quantum chromodynamics, Physics, Annihilation, OPAL, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, LEP, FLUCTUATIONS, MICROVERTEX DETECTOR, Charged particle, Gluon, FACTORIAL, Kurtosis, High Energy Physics::Experiment, HADRON DISTRIBUTIONS, Particle Physics - Experiment, AVERAGE MULTIPLICITIES
Abstract: Gluon jets are identified in e+e- hadronic annihilation events by tagging two quark jets in the same hemisphere of an event. The gluon jet is defined inclusively as all the particles in the opposite hemisphere. Gluon jets defined in this manner have a close correspondence to gluon jets as they are defined for analytic calculations, and are almost independent of a jet finding algorithm. The charged particle multiplicity distribution of the gluon jets is presented, and is analyzed for its mean, dispersion, skew, and curtosis values, and for its factorial and cumulant moments. The results are compared to the analogous results found for a sample of light quark (uds) jets, also defined inclusively. We observe differences between the mean, skew and curtosis values of gluon and quark jets, but not between their dispersions. The cumulant moment results are compared to the predictions of QCD analytic calculations. A calculation which includes next-to-next-to-leading order corrections and energy conservation is observed to provide a much improved description of the data compared to a next-to-leading order calculation without energy conservation. There is agreement between the data and calculations for the ratios of the cumulant moments between gluon and quark jets., 32 pages, LaTeX, uses a4p.sty, 9 eps figures included (plus in colour), submitted to Zeit. Phys. C
Published: 1997

195. A measurement of the hadronic decay current and the $\nu_{\tau}$-helicity in $\tau^- \to \pi^- \pi^- \pi^+ \nu_{\tau}$

Author: Daniel Lellouch, Takehiko Mori, T. J. McMahon, V. Zacek, Claire Shepherd-Themistocleous, Dave Charlton, R. K. Carnegie, R. Bartoldus, M. Herndon, A. A. Faust, John Allison, M. Bobinski, J. A. Wilson, R. Bürgin, S. B. Anderson, P. Szymanski, H. O. Ogren, Christoph Geich-Gimbel, D. Lazic, S. Yamashita, S. D. Bird, P. S. Wells, Paolo Giacomelli, M. Hansroul, P. Schenk, Gideon Bella, Stan Bentvelsen, Terry Richard Wyatt, J. E. Bloomer, H. J. Burckhart, Jacqueline Batley, R. G. Kellogg, M. Steiert, Sachio Komamiya, Theodoros Geralis, P. Igo-Kemenes, R. W. Springer, D. Axen, A. Jawahery, K. Ishii, H. Jeremie, H. M. Fischer, C. Burgard, R. J. Homer, R. Van Kooten, J. Letts, R. E. Hughes-Jones, Csaba Hajdu, E. Ros, A. T. Watson, Stefano Marcellini, P. E.L. Clarke, T. J. Smith, K. Stephens, Peter Sherwood, M. K. Jones, J. E. Conboy, A. Fürtjes, Alexander Wagner, T. Omori, Ekg Sarkisyan, P. W. Jeffreys, J. Ludwig, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, K. Sachs, J. P. Martin, A. S. Turcot, F. Fiedler, O. C. Cooke, Guenter Duckeck, K. Runge, P. Bock, Shlomo Dado, U. Jost, R. Mir, R. Hawkings, J. Lauber, C. R. Jones, T. P. Kokott, P. Poffenberger, Georges Azuelos, D. M. Strom, M. Kolrep, O. Schaile, E. do Couto e Silva, S. A. Robins, E. Tsur, M. Verzocchi, S. De Jong, Otmar Biebel, Abish Malik, Silvia Arcelli, J. von Krogh, N. J. Oldershaw, R. Rylko, P. Schütz, S. D. Talbot, V. Gibson, Sven Menke, K. W. Bell, J. Pálinkás, P. Pfeifenschneider, Stefan Kluth, Giora Mikenberg, Shlomit Tarem, D. Eatough, C. Hartmann, D. E. Plane, Stephen Hillier, L. A. del Pozo, Kiyotomo Kawagoe, J. Patt, H. Przysiezniak, T. R. Junk, I. Trigger, T. Behnke, G. Yekutieli, J. C. Hill, Misao Sasaki, A. Macchiolo, B. Stockhausen, Paul Kyberd, F. K. Loebinger, J. Steuerer, S. Braibant, F. G. Oakham, B. Schmitt, E. L. Barberio, A. Macpherson, M. Boutemeur, F. S. Merritt, D. R. Ward, T. Kress, N. I. Geddes, Norbert Wermes, Sherry Towers, A. N. Bell, W. Mohr, A. Posthaus, M. Gruwé, A. D. Schaile, Gabriella Pasztor, Michael Hildreth, A. A. Carter, Stefan Schmitt, C. M. Hawkes, W. J. McDonald, U. Müller, B. C. Shen, J. J. Ward, P. Vikas, D. Lanske, Ron Folman, Roger Jones, A. J. Martin, T. Kawamoto, R. Howard, J. S. White, P. Gagnon, Joleen Pater, R. Giacomelli, G. W. Wilson, M. Hauschild, N. L. Rodning, M. F. Turner-Watson, M. Morii, U. Ruppel, P. Utzat, B. Poli, Richard Nisius, Siegfried Bethke, A. K. Honma, Achim Stahl, A. I. McNab, J. Bechtluft, J. Goldberg, B. Nijjhar, S. Orito, M. Rosvick, W. G. Scott, F. X. Gentil, A. Sittler, S. A. Wotton, J. A. McKenna, C. Markus, W. Matthews, Peter R Hobson, M. R. Ingram, G. G. Hanson, G. A. Snow, C. P. Ward, D. Zer-Zion, G. M. Dallavalle, Marco Cuffiani, I. Nakamura, M. Hapke, B. Nellen, E. A. Mckigney, G. T. Jones, D. E. Hutchcroft, E. H. Vokurka, P. Routenburg, G. Giacomelli, M. A. Thomson, S. Söldner-Rembold, M. Fierro, J. E.G. Edwards, W. P. Lai, C. K. Hargrove, H. M. Bosch, D. Glenzinski, M. J. Oreglia, Dezso Horvath, M. J. Losty, P. Mättig, Shoji Asai, E. K. U. Gross, S. Robertson, Tara Shears, A. Gaidot, I. J. Bloodworth, Gregor Herten, R. Lahmann, M. S. Dixit, D. C. Imrie, H. G. Evans, Jean-Arcady Meyer, S. R. Lautenschlager, H. A. Neal, J. Grunhaus, M. J. Goodrick, J. M. Roney, A. Joly, I. Cohen, Frans Meijers, B. Wilkens, P. A. Hart, D. Rigby, R. J. Hemingway, M. Sproston, J. R. Carter, G. N. Patrick, T. Hilse, G. P. Siroli, J. E. Pilcher, S. W. O'Neale, Gunter Wolf, O. Runolfsson, Yoram Rozen, C. Sbarra, K. Ackerstaff, M. J. Pearce, S. M. Gascon-Shotkin, A. Biguzzi, A. Rooke, J. G. Layter, B. W. Kennedy, K. J. Anderson, C. Beeston, Claudio Grandi, M. Foucher, Reda Tafirout, Klaus Kurt Desch, P. Jovanovic, Austin Ball, P. G. Estabrooks, R. K. Keeler, Peter Krieger, N. K. Watson, D. Karlen, P. M. Watkins, Manuella Vincter, Alessandro Montanari, Matthias Schröder, Matthew Evans, W. R. Gibson, B. T. Bouwens, C. Y. Chang, M. Thiergen, H. Lafoux, R. M. Brown, A. M. Rossi, Lorne Levinson, C. Dallapiccola, T. Tsukamoto, P. Taras, Michael Kobel, A. Skillman, N. Altekamp, Julie Kirk, R. J. Barlow, D. J. Miller, D. L. Rees, F. Scharf, German Martinez, H. Mes, I. P. Duerdoth, P. Fath, M. Schumacher, E. Lefebvre, F. Odorici, James Pinfold, D. G. Fong, C. Lewis, J. Gascon, Ehud Duchovni, M. Jimack, A. Michelini, Satoshi Tanaka, T. Kobayashi, D. Chrisman, G. D. Long, Volker Blobel, Stephen Lloyd, J. W. Gary, D. S. Koetke, K. Ametewee, Gideon Alexander, Paolo Capiluppi, Marcello Mannelli, Andris Skuja, S. Petzold, Tetsuro Mashimo, W. Gorn, F. Wäckerle, D. M. Gingrich, P. Berlich, K. Nagai, D. R. Rust, P. Scharff-Hansen, A. M. Lee, E. von Törne, M. Fanti, A. M. Smith, G. Vasseur, Robert McPherson, Mathieu Doucet, R. D. Heuer, and Fabrizio Fabbri
Subjects: Nuclear physics, Physics, Hadronic decay, Particle physics, Physics and Astronomy (miscellaneous), media_common.quotation_subject, Electron–positron annihilation, Dalitz plot, Current (fluid), Asymmetry, Helicity, Particle Physics - Experiment, media_common
Published: 1997

196. Measurement of the Semileptonic Branching Fraction of Inclusive b Baryon Decays to $\Lambda$

Author: K. Stephens, John Allison, R. G. Kellogg, M. Steiert, Csaba Hajdu, Stefano Marcellini, A. Joly, S. R. Lautenschlager, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Silvia Arcelli, J. Steuerer, Joleen Pater, H. A. Neal, T. Hilse, R. Giacomelli, T. J. McMahon, R. W. Springer, P. Scharff-Hansen, Gideon Bella, N. I. Geddes, O. Runolfsson, M. Boutemeur, F. S. Merritt, U. Jost, R. Mir, V. Gibson, T. R. Junk, S. Braibant, R. Lahmann, N. J. Oldershaw, H. J. Burckhart, P. Poffenberger, A. Rooke, I. Trigger, Tara Shears, D. C. Imrie, P. Gagnon, Jacqueline Batley, A. D. Schaile, Gabriella Pasztor, A. I. McNab, J. G. Layter, Michael Hildreth, Robert McPherson, C. Beeston, D. R. Ward, T. Kress, E. A. Mckigney, P. Schütz, J. Goldberg, D. M. Strom, Claudio Grandi, Georges Azuelos, H. Mes, N. L. Rodning, I. P. Duerdoth, W. P. Lai, S. Yamashita, E. Tsur, W. R. Gibson, Mathieu Doucet, U. Ruppel, M. R. Ingram, J. Grunhaus, P. Igo-Kemenes, M. Verzocchi, K. W. Bell, B. Nellen, F. G. Oakham, P. A. Hart, B. Poli, T. Behnke, G. P. Siroli, A. M. Smith, T. Omori, R. K. Carnegie, R. D. Heuer, K. Ishii, H. Jeremie, Fabrizio Fabbri, J. Bechtluft, J. Pálinkás, B. Schmitt, C. Y. Chang, R. Rylko, E. L. Barberio, A. Sittler, J. A. McKenna, J. C. Hill, Misao Sasaki, M. Hapke, W. J. McDonald, B. C. Shen, S. Robertson, M. Herndon, Gregor Herten, K. Ametewee, P. Taras, J. M. Roney, Michael Kobel, Siegfried Bethke, D. E. Hutchcroft, A. K. Honma, B. Nijjhar, W. G. Scott, C. R. Jones, G. Vasseur, R. E. Hughes-Jones, I. Nakamura, B. Wilkens, D. Rigby, R. J. Hemingway, J. E. Pilcher, G. A. Snow, Gideon Alexander, C. P. Ward, Paolo Capiluppi, M. J. Pearce, M. Schumacher, E. Lefebvre, G. W. Wilson, M. Hauschild, K. Nagai, P. Schenk, B. W. Kennedy, S. A. Wotton, Stefan Schmitt, Julie Kirk, M. J. Oreglia, P. Jovanovic, H. M. Fischer, S. Söldner-Rembold, C. Markus, M. Bobinski, B. T. Bouwens, F. Odorici, G. T. Jones, Austin Ball, Peter Krieger, S. Petzold, G. D. Long, J. R. Carter, G. N. Patrick, G. G. Hanson, M. F. Turner-Watson, H. G. Evans, E. H. Vokurka, J. A. Wilson, D. Glenzinski, Dezso Horvath, M. J. Losty, D. R. Rust, S. B. Anderson, P. Szymanski, M. Gruwé, Jean-Arcady Meyer, R. M. Brown, Tetsuro Mashimo, Manuella Vincter, Alessandro Montanari, P. S. Wells, Dave Charlton, M. Morii, Otmar Biebel, Lorne Levinson, C. M. Hawkes, Peter R Hobson, Ehud Duchovni, P. G. Estabrooks, O. Schaile, R. K. Keeler, C. Dallapiccola, Terry Richard Wyatt, A. Skillman, P. Routenburg, M. J. Goodrick, J. E. Bloomer, Kiyotomo Kawagoe, Sachio Komamiya, K. Sachs, G. Giacomelli, Theodoros Geralis, I. Cohen, E. do Couto e Silva, M. Jimack, A. M. Lee, D. Lazic, Shlomo Dado, E. Ros, A. T. Watson, J. Letts, C. Hartmann, D. E. Plane, N. Altekamp, R. Bürgin, W. Gorn, Norbert Wermes, Sherry Towers, A. Michelini, T. Kawamoto, S. A. Robins, C. Sbarra, E. von Törne, Stephen Hillier, R. J. Barlow, G. M. Dallavalle, S. W. O'Neale, M. S. Dixit, H. Lafoux, K. J. Anderson, Frans Meijers, Richard Nisius, Stan Bentvelsen, S. Orito, M. Rosvick, D. J. Miller, T. P. Kokott, Sven Menke, P. E.L. Clarke, G. Yekutieli, M. K. Jones, P. M. Watkins, Giora Mikenberg, J. P. Martin, A. A. Carter, Ron Folman, James Pinfold, Roger Jones, Satoshi Tanaka, T. Kobayashi, R. Van Kooten, D. G. Fong, C. Lewis, P. Mättig, Shoji Asai, J. Gascon, S. M. Gascon-Shotkin, U. Müller, S. De Jong, Marco Cuffiani, Stefan Kluth, Reda Tafirout, Klaus Kurt Desch, Shlomit Tarem, B. J. King, P. Utzat, R. Howard, J. S. White, A. J. Martin, H. Przysiezniak, F. X. Gentil, A. N. Bell, O. C. Cooke, Matthew Evans, A. M. Rossi, A. Biguzzi, T. Tsukamoto, J. W. Gary, Daniel Lellouch, D. Chrisman, D. S. Koetke, Claire Shepherd-Themistocleous, Volker Blobel, Gunter Wolf, K. Ackerstaff, F. Wäckerle, Marcello Mannelli, Stephen Lloyd, Hans-Christian Schultz-Coulon, Takehiko Mori, D. M. Gingrich, J. von Krogh, Randall Sobie, Michael Schulz, G. D. Lafferty, R. J. Hawkings, L. A. del Pozo, V. Zacek, P. Berlich, I. J. Bloodworth, Yoram Rozen, P. Path, M. Foucher, Guenter Duckeck, D. Karlen, A. S. Turcot, F. Fiedler, M. Fierro, J. E.G. Edwards, A. Malik, Ekg Sarkisyan, P. W. Jeffreys, R. Bartoldus, H. M. Bosch, J. J. Ward, P. Vikas, D. Lanske, J. Lauber, F. Strumia, S. D. Talbot, H. O. Ogren, M. Kolrep, Christoph Geich-Gimbel, D. Axen, A. Jawahery, Peter Sherwood, Alexander Wagner, Achim Stahl, J. Ludwig, K. Runge, P. Bock, J. E. Conboy, A. Fürtjes, P. Pfeifenschneider, J. Patt, Paolo Giacomelli, M. Hansroul, C. Burgard, R. J. Homer, C. K. Hargrove, Matthias Schröder, M. Thiergen, N. K. Watson, W. Mohr, A. Posthaus, W. Matthews, M. A. Thomson, E. K. U. Gross, A. Gaidot, M. Sproston, D. L. Rees, A. Skuja, F. Scharf, German Martinez, and T. J. Smith
Subjects: Nuclear physics, Physics, Baryon, Particle physics, Physics and Astronomy (miscellaneous), Branching fraction, Particle Physics - Experiment
Published: 1996

197. Analysis of Hadronic Final States and the Photon Structure Function $F_2 ^\gamma$ in Deep Inelastic Electron-Photon Scattering at LEP

Author: W. R. Gibson, U. Müller, A. J. Martin, P. Scharff-Hansen, B. T. Bouwens, A. M. Smith, G. Vasseur, R. M. Brown, N. I. Geddes, Lorne Levinson, Michael Hildreth, C. Y. Chang, P. Taras, Michael Kobel, Gideon Bella, A. Skillman, R. Van Kooten, H. J. Burckhart, N. L. Rodning, Jacqueline Batley, Julie Kirk, P. E.L. Clarke, M. K. Jones, B. Poli, F. Wäckerle, D. M. Gingrich, J. P. Martin, Sachio Komamiya, C. K. Hargrove, S. De Jong, T. J. Smith, P. Schenk, Theodoros Geralis, E. Ros, A. T. Watson, W. J. McDonald, T. Omori, K. Stephens, P. Berlich, B. C. Shen, H. Przysiezniak, Reda Tafirout, Klaus Kurt Desch, A. N. Bell, Andris Skuja, C. R. Jones, T. P. Kokott, I. J. Bloodworth, S. Petzold, Siegfried Bethke, A. K. Honma, B. Nijjhar, James Pinfold, G. D. Long, S. W. O'Neale, Tetsuro Mashimo, K. J. Anderson, W. G. Scott, D. G. Fong, C. Lewis, J. Gascon, P. G. Estabrooks, R. K. Keeler, J. W. Gary, D. S. Koetke, Marcello Mannelli, M. Boutemeur, F. S. Merritt, W. Gorn, I. Nakamura, M. Schumacher, H. Lafoux, Matthias Schröder, E. Lefebvre, A. Malik, Ekg Sarkisyan, S. Yamashita, P. Igo-Kemenes, S. M. Gascon-Shotkin, F. X. Gentit, F. Odorici, John Allison, D. Glenzinski, K. Ishii, H. Jeremie, J. Bechtluft, P. W. Jeffreys, S. Robertson, Gregor Herten, J. A. McKenna, Dezso Horvath, M. J. Losty, G. G. Hanson, Jean-Arcady Meyer, Claire Shepherd-Themistocleous, V. Gibson, P. M. Watkins, R. E. Hughes-Jones, P. Gagnon, Robert McPherson, Otmar Biebel, C. Hartmann, D. E. Plane, M. Thiergen, G. Giacomelli, R. G. Kellogg, M. Steiert, Stephen Hillier, G. M. Dallavalle, P. Pfeifenschneider, Matthew Evans, A. M. Rossi, O. Schaile, Mathieu Doucet, T. R. Junk, Yoram Rozen, R. D. Heuer, Csaba Hajdu, P. Poffenberger, Fabrizio Fabbri, B. Wilkens, T. Tsukamoto, R. W. Springer, H. Mes, I. P. Duerdoth, H. M. Fischer, J. Patt, P. Fath, M. S. Dixit, E. do Couto e Silva, R. Bartoldus, Stefano Marcellini, M. Foucher, Frans Meijers, K. Nagai, I. Trigger, J. J. Ward, P. Schütz, P. Vikas, M. F. Turner-Watson, H. O. Ogren, Christoph Geich-Gimbel, M. Morii, Peter R Hobson, D. R. Ward, T. Kress, Dave Charlton, Georges Azuelos, S. Braibant, D. R. Rust, Sven Menke, D. Lanske, A. Rooke, T. Behnke, E. Tsur, J. G. Layter, A. Sittler, S. A. Robins, J. E. Pilcher, A. I. McNab, A. D. Schaile, Gabriella Pasztor, R. Bürgin, M. Verzocchi, K. W. Bell, Silvia Arcelli, J. E. Conboy, A. Fürtjes, A. M. Lee, P. Routenburg, E. von Törne, J. Pálinkás, A. Joly, D. Karlen, K. Ametewee, Achim Stahl, J. C. Hill, Misao Sasaki, R. Lahmann, M. Gruwé, C. M. Hawkes, Gideon Alexander, H. M. Bosch, D. C. Imrie, Daniel Lellouch, J. Goldberg, G. A. Snow, C. P. Ward, Richard Nisius, Takehiko Mori, Paolo Capiluppi, Tara Shears, J. Letts, G. P. Siroli, M. Fierro, J. E.G. Edwards, Marco Cuffiani, S. R. Lautenschlager, H. A. Neal, S. Söldner-Rembold, Paolo Giacomelli, M. Hansroul, Norbert Wermes, Sherry Towers, B. Stockhausen, Paul Kyberd, F. K. Loebinger, T. Hilse, V. Zacek, E. A. Mckigney, J. Steuerer, O. Runolfsson, W. P. Lai, Kiyotomo Kawagoe, C. Burgard, T. Kawamoto, P. A. Hart, Joleen Pater, R. Giacomelli, C. Beeston, R. J. Homer, J. Grunhaus, Claudio Grandi, D. Chrisman, Volker Blobel, D. Axen, A. Jawahery, U. Ruppel, M. R. Ingram, S. Orito, K. Sachs, B. Nellen, Shlomo Dado, N. J. Oldershaw, M. Rosvick, J. M. Roney, M. J. Pearce, M. Hapke, Peter Sherwood, Giora Mikenberg, Stephen Lloyd, Alexander Wagner, D. E. Hutchcroft, J. Ludwig, Stefan Schmitt, R. Howard, M. J. Oreglia, K. Runge, P. Bock, Ehud Duchovni, J. Lauber, J. S. White, J. R. Carter, G. N. Patrick, F. Strumia, P. Mättig, M. Jimack, A. Michelini, S. D. Talbot, Shoji Asai, G. W. Wilson, M. Hauschild, S. B. Anderson, S. A. Wotton, C. Markus, P. Szymanski, Satoshi Tanaka, T. Kobayashi, G. T. Jones, E. H. Vokurka, D. M. Strom, R. Rylko, H. G. Evans, P. S. Wells, M. J. Goodrick, I. Cohen, Stan Bentvelsen, Terry Richard Wyatt, J. E. Bloomer, Stefan Kluth, Shlomit Tarem, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, Gunter Wolf, K. Ackerstaff, Guenter Duckeck, A. S. Turcot, F. Fiedler, M. Kolrep, C. Sbarra, G. Yekutieli, A. A. Carter, Ron Folman, Roger Jones, B. J. King, P. Utzat, O. C. Cooke, J. von Krogh, R. J. Hawkings, L. A. del Pozo, T. J. McMahon, R. K. Carnegie, M. Herndon, M. Bobinski, J. A. Wilson, D. Lazic, C. Dallapiccola, N. Altekamp, R. J. Barlow, D. J. Miller, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, U. Jost, R. Mir, F. G. Oakham, B. Schmitt, E. L. Barberio, D. L. Rees, F. Scharf, German Martinez, W. Matthews, M. A. Thomson, E. K. U. Gross, A. Gaidot, M. Sproston, N. K. Watson, W. Mohr, and A. Posthaus
Subjects: Nuclear physics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Energy flow, Hadron, Angular dependence, Electron, Photon structure function, Photon scattering, Particle Physics - Experiment
Published: 1996

198. Multiplicity dependence of Bose-Einstein correlations in hadronic $Z^0$ decays

Author: U. Müller, T. J. McMahon, A. S. Turcot, A. J. Martin, Otmar Biebel, R. K. Carnegie, M. Bobinski, J. A. Wilson, R. Lahmann, J. Palinkas, D. C. Imrie, K. Sachs, Shlomo Dado, Dave Charlton, C. K. Hargrove, D. Lazic, R. Bürgin, S. Yamashita, M. Starks, Matthias Schröder, Giora Mikenberg, P. Igo-Kemenes, H. M. Fischer, S. Braibant, A. D. Schaile, Gabriella Pasztor, G. P. Siroli, G. A. Snow, C. P. Ward, S. Söldner-Rembold, M. Thiergen, H. Lafoux, T. Behnke, J. Letts, Norbert Wermes, P. Scharff-Hansen, K. Ishii, H. Jeremie, Sherry Towers, Ehud Duchovni, K. Stephens, M. Jimack, R. E. Hughes-Jones, M. Boutemeur, F. S. Merritt, T. Kawamoto, A. Michelini, Richard Keeler, M. Fierro, Gregor Herten, J. E.G. Edwards, M. F. Turner-Watson, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, M. Morii, Gideon Bella, C. Sbarra, Satoshi Tanaka, T. Kobayashi, B. Wilkens, C. H. Shepherd-Themistocleous, Peter R Hobson, S. Orito, M. Rosvick, Tara Shears, A. M. Smith, Ekg Sarkisyan, P. W. Jeffreys, Robert McPherson, M. Gruwé, Mathieu Doucet, C. M. Hawkes, P. Routenburg, Guenter Duckeck, P. Poffenberger, H. J. Burckhart, Jacqueline Batley, P. A. Hart, O. Schaile, R. Howard, J. S. White, W. R. Gibson, J. E. Pilcher, S. A. Robins, G. Yekutieli, G. Vasseur, M. Hapke, P. G. Estabrooks, E. do Couto e Silva, D. L. Rees, D. Chrisman, M. J. Pearce, R. D. Heuer, Fabrizio Fabbri, V. Gibson, Volker Blobel, J. Bechtluft, U. Jost, R. Mir, S. B. Anderson, G. W. Wilson, P. Szymanski, J. A. McKenna, Sachio Komamiya, P. Gagnon, Theodoros Geralis, E. Ros, A. A. Carter, Ron Folman, M. Hauschild, S. A. Wotton, Roger Jones, D. E. Hutchcroft, C. Markus, F. Scharf, German Martinez, R. Van Kooten, J. J. Ward, P. Vikas, B. T. Bouwens, Stephen Lloyd, Richard Nisius, D. Lanske, Robert M Brown, T. Omori, T. P. Kokott, A. Luig, T. R. Junk, D. M. Strom, Marco Cuffiani, B. J. King, G. T. Jones, P. Schütz, P. M. Watkins, M. J. Oreglia, A. Sittler, P. Utzat, James Pinfold, D. G. Fong, C. Lewis, Stan Bentvelsen, R. Bartoldus, S. R. Lautenschlager, H. A. Neal, J. Gascon, F. Wäckerle, Sven Menke, N. I. Geddes, Michael Hildreth, D. R. Ward, Lorne Levinson, C. R. Jones, T. Kress, Paolo Giacomelli, M. Hansroul, E. H. Vokurka, Kiyotomo Kawagoe, D. M. Gingrich, H. O. Ogren, H. M. Bosch, O. C. Cooke, R. Kowalewski, Christoph Geich-Gimbel, N. K. Watson, R. Rylko, K. Ametewee, N. L. Rodning, Gideon Alexander, B. Poli, J. R. Carter, G. N. Patrick, Silvia Arcelli, T. Hilse, H. Mes, O. Runolfsson, A. Malik, J. W. Gary, P. Berlich, D. S. Koetke, P. S. Wells, K. Nagai, Marcello Mannelli, S. L. Chu, Paolo Capiluppi, A. Joly, C. Burgard, J. Lauber, Terry Richard Wyatt, A. Skillman, J. E. Bloomer, D. R. Rust, Andris Skuja, I. P. Duerdoth, R. J. Homer, S. Petzold, G. D. Long, F. G. Oakham, J. von Krogh, F. X. Gentit, B. Schmitt, J. E. Conboy, S. M. Gascon-Shotkin, C. Beeston, Claudio Grandi, P. Fath, P. Weber, Tetsuro Mashimo, W. Mohr, A. M. Lee, M. Tecchio, E. von Törne, A. Fürtjes, C. Hartmann, D. E. Plane, E. L. Barberio, E. A. Mckigney, A. Posthaus, W. Gorn, Frank Fiedler, W. P. Lai, P. Pfeifenschneider, R. J. Hawkings, C. Y. Chang, Matthew Evans, A. M. Rossi, F. Strumia, S. D. Talbot, W. Matthews, J. Patt, L. A. del Pozo, Stephen Hillier, G. M. Dallavalle, T. Tsukamoto, M. A. Thomson, U. Ruppel, M. R. Ingram, J. M. Roney, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Achim Stahl, J. Steuerer, P. Taras, E. K. U. Gross, A. Gaidot, D. Rigby, R. J. Hemingway, Alan Watson, M. Sproston, Michael Kobel, Joleen Pater, R. Giacomelli, Reda Tafirout, Klaus Kurt Desch, John Allison, B. W. Kennedy, R. G. Kellogg, M. Steiert, Csaba Hajdu, P. Jovanovic, Stefano Marcellini, D. Axen, A. Jawahery, Julie Kirk, Austin Ball, Peter Krieger, Peter Sherwood, Alexander Wagner, J. Ludwig, K. Runge, P. Bock, Manuella Vincter, Alessandro Montanari, C. Dallapiccola, M. Schumacher, E. Lefebvre, F. Odorici, N. Altekamp, S. W. O'Neale, R. J. Barlow, D. J. Miller, K. J. Anderson, Stefan Schmitt, T. J. Smith, P. Mättig, Shoji Asai, Daniel Lellouch, Takehiko Mori, V. Zacek, I. J. Bloodworth, Yoram Rozen, M. Foucher, W. J. McDonald, B. C. Shen, D. Karlen, Siegfried Bethke, A. K. Honma, B. Nijjhar, W. G. Scott, I. Nakamura, D. Glenzinski, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, R. W. Springer, Georges Azuelos, E. Tsur, M. Verzocchi, K. W. Bell, J. C. Hill, Misao Sasaki, Stefan Kluth, Shlomit Tarem, A. I. McNab, J. Goldberg, B. Nellen, H. G. Evans, M. J. Goodrick, I. Cohen, Gunter Wolf, P. E.L. Clarke, M. K. Jones, J. P. Martin, S. De Jong, H. Przysiezniak, A. N. Bell, G. G. Hanson, G. Giacomelli, P. Schenk, M. S. Dixit, Frans Meijers, A. Rooke, J. G. Layter, and C. Charlesworth
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Unit increase, Electron–positron annihilation, Transverse momentum, Hadron, Bose–Einstein correlations, Multiplicity (chemistry), Particle Physics - Experiment
Abstract: Bose-Einstein correlations between like charged track pairs have been studied using a sample of approximately 3.6 million multihadronic Z0 decays collected with the OPAL detector at LEP. The radius of the emitting sourceR and the chaoticity parameterλ were studied using two parametrisations, the Goldhaber (G) parametrisation and the one-dimensional Kopylov-Podgoretskii (KP) parametrisation. The radiiR G andR KP are found to increase linearly with the average observed charged multiplicityn ch , with changes with respect to a unit increase inn ch of $$\begin{gathered} \frac{1}{{\langle R_G \rangle }}\frac{{\Delta R_G }}{{\Delta n_{ch} }} = (3.6 \pm 0.6) \cdot 10^{ - 3} and \hfill \\ \frac{1}{{\langle R_{KP} \rangle }}\frac{{\Delta R_{KP} }}{{\Delta n_{ch} }} = (3.4 \pm 1.0) \cdot 10^{ - 3} . \hfill \\ \end{gathered} $$ where the 〈R〉 are the radius values measured in the inclusive event sample. The chaoticity parametersλ G andλ KP decrease with increasing charged multiplicity. It is shown that the increase ofR with multiplicity may be connected with differences between two- and three-jet events.
Published: 1996

199. Strange baryon production in hadronic $Z^ 0$ decays

Author: D. J. Miller, R. Van Kooten, M. Hapke, R. Bartoldus, I. J. Bloodworth, Ekg Sarkisyan, P. W. Jeffreys, A. I. McNab, O. C. Cooke, D. E. Hutchcroft, H. O. Ogren, J. Goldberg, B. Nellen, F. Wäckerle, P. Poffenberger, P. S. Wells, Christoph Geich-Gimbel, J. J. Ward, P. Vikas, D. Lanske, D. M. Gingrich, D. Axen, A. Jawahery, M. Fierro, J. E.G. Edwards, M. J. Oreglia, Yoram Rozen, M. Foucher, S. R. Lautenschlager, H. A. Neal, Terry Richard Wyatt, J. E. Bloomer, T. Hilse, James Pinfold, M. F. Turner-Watson, H. Mes, O. Runolfsson, J. von Krogh, Peter Sherwood, D. G. Fong, C. Lewis, P. Schütz, C. Beeston, Claudio Grandi, I. P. Duerdoth, Frank Fiedler, M. Morii, P. Berlich, W. R. Gibson, Paolo Giacomelli, M. Hansroul, J. Gascon, Alexander Wagner, J. Ludwig, K. Runge, P. Bock, P. Fath, Peter R Hobson, H. G. Evans, W. J. McDonald, A. Rooke, B. C. Shen, J. G. Layter, R. J. Hawkings, L. A. del Pozo, M. J. Goodrick, F. X. Gentit, D. Karlen, C. Dallapiccola, Gideon Bella, I. Cohen, B. T. Bouwens, K. Stephens, A. Joly, C. Sbarra, P. Gagnon, C. Burgard, P. Routenburg, S. Yamashita, P. Igo-Kemenes, Siegfried Bethke, C. Charlesworth, J. R. Carter, J. W. Gary, K. Sachs, Shlomo Dado, C. H. Shepherd-Themistocleous, N. K. Watson, Gunter Wolf, J. E. Conboy, H. J. Burckhart, A. Fürtjes, A. K. Honma, B. Nijjhar, W. G. Scott, S. L. Chu, A. S. Turcot, G. N. Patrick, Stefan Schmitt, Jacqueline Batley, N. I. Geddes, Michael Hildreth, A. Sittler, R. J. Homer, D. S. Koetke, R. M. Brown, K. Ishii, H. Jeremie, Marcello Mannelli, I. Nakamura, G. Yekutieli, Lorne Levinson, N. Altekamp, Otmar Biebel, T. J. Smith, N. L. Rodning, Robert McPherson, H. M. Bosch, A. A. Carter, Ron Folman, Roger Jones, R. E. Hughes-Jones, V. Gibson, J. Lauber, R. J. Barlow, B. Poli, P. Scharff-Hansen, Mathieu Doucet, Giora Mikenberg, S. W. O'Neale, D. Glenzinski, Dezso Horvath, Gregor Herten, A. Skillman, Kiyotomo Kawagoe, K. J. Anderson, B. J. King, P. Utzat, P. Mättig, Shoji Asai, T. Omori, R. D. Heuer, Fabrizio Fabbri, W. Mohr, Richard Keeler, T. R. Junk, Achim Stahl, O. Schaile, M. Boutemeur, F. S. Merritt, M. J. Losty, Abish Malik, S. Braibant, Jean-Arcady Meyer, M. Schumacher, E. Lefebvre, B. Wilkens, A. D. Schaile, Gabriella Pasztor, F. Strumia, C. Hartmann, D. E. Plane, A. Posthaus, F. Odorici, H. M. Fischer, K. Nagai, S. B. Anderson, P. Szymanski, C. Y. Chang, P. Taras, S. D. Talbot, C. R. Jones, B. Stockhausen, Paul Kyberd, F. K. Loebinger, E. do Couto e Silva, Stephen Hillier, D. R. Rust, A. M. Smith, P. E.L. Clarke, P. Weber, M. K. Jones, T. J. McMahon, J. P. Martin, G. Vasseur, Michael Kobel, G. A. Snow, C. P. Ward, D. Rigby, R. J. Hemingway, G. M. Dallavalle, J. E. Pilcher, J. Letts, R. K. Carnegie, S. Söldner-Rembold, Daniel Lellouch, J. Bechtluft, Norbert Wermes, Sherry Towers, J. Steuerer, D. R. Ward, T. Kress, Joleen Pater, U. Ruppel, M. R. Ingram, Sven Menke, U. Müller, R. W. Springer, Sachio Komamiya, Andris Skuja, S. De Jong, Theodoros Geralis, E. Ros, S. Petzold, M. Bobinski, G. D. Long, A. J. Martin, A. M. Lee, Stefan Kluth, Shlomit Tarem, B. W. Kennedy, T. Kawamoto, Stan Bentvelsen, P. G. Estabrooks, P. Jovanovic, Julie Kirk, Alan Watson, R. Lahmann, M. Tecchio, E. von Törne, R. Giacomelli, Dave Charlton, D. L. Rees, Austin Ball, D. C. Imrie, T. P. Kokott, S. A. Robins, Takehiko Mori, A. Luig, T. Behnke, V. Zacek, F. Scharf, Peter Krieger, Georges Azuelos, S. Orito, M. Rosvick, J. A. Wilson, German Martinez, R. Howard, J. S. White, J. A. McKenna, Hans-Christian Schultz-Coulon, R. Bürgin, E. Tsur, Manuella Vincter, Tetsuro Mashimo, Alessandro Montanari, G. P. Siroli, D. Lazic, M. Verzocchi, K. W. Bell, H. Przysiezniak, W. Gorn, M. Gruwé, Randall Sobie, J. Pálinkás, Michael Schulz, G. D. Lafferty, W. Matthews, U. Jost, R. Mir, John Allison, C. M. Hawkes, M. A. Thomson, J. C. Hill, P. Pfeifenschneider, Misao Sasaki, A. N. Bell, C. K. Hargrove, Tara Shears, E. K. U. Gross, A. Gaidot, Reda Tafirout, Klaus Kurt Desch, M. Sproston, J. Patt, R. G. Kellogg, M. Steiert, M. Starks, Guenter Duckeck, P. A. Hart, P. M. Watkins, Csaba Hajdu, F. G. Oakham, Richard Nisius, G. G. Hanson, Stefano Marcellini, M. J. Pearce, B. Schmitt, E. L. Barberio, G. W. Wilson, G. Giacomelli, M. Hauschild, S. A. Wotton, Matthias Schröder, P. Schenk, C. Markus, M. Thiergen, H. Lafoux, G. T. Jones, D. M. Strom, E. H. Vokurka, M. S. Dixit, Frans Meijers, Marco Cuffiani, Silvia Arcelli, S. M. Gascon-Shotkin, R. Rylko, E. A. Mckigney, W. P. Lai, J. M. Roney, Matthew Evans, A. M. Rossi, T. Tsukamoto, Ehud Duchovni, M. Jimack, A. Michelini, Satoshi Tanaka, T. Kobayashi, D. Chrisman, Volker Blobel, Stephen Lloyd, R. Kowalewski, K. Ametewee, Gideon Alexander, and Paolo Capiluppi
Subjects: Quantum chromodynamics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Nuclear physics, Baryon, Diquark, Excited state, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, Particle Physics - Experiment
Abstract: The production of the $J^{P}={1⩈er 2}^{+}$ octet baryons Λ and Ξ−, the $J^{P}={3⩈er 2}^{+}$ decuplet baryons Σ(1385)±Ξ(1530)0, and Ω−, and the $J^{P}={3⩈er 2}^{-}$ orbitally excited state Λ(1520) has been measured in a sample of approximately 3.65 million hadronic Z0 decays. The integrated rates and the differential cross-sections as a function of xE, the scaled energy, are determined. The differential cross-sections of the Λ and Ξ− baryons are found to be softer than those predicted by both the JETSET and HERWIG Monte Carlo generators. The measured baryon yields are found to disagree with the simple diquark picture where only one tuning parameter for spin 1 diquarks is allowed. The yields are further compared with a thermodynamic model of hadron production which includes the production of orbitally excited mesons and baryons. The momentum spectra of Λ, Ξ−, Σ(1385)±Ξ(1530)0, and Λ(1520) are also compared to the predictions of an analytical QCD formula.
Published: 1996

200. $\Sigma^{+}$, $\Sigma^{0}$ and $\Sigma^{-}$ hyperon production in hadronic $Z^{0}$ decays

Author: James Pinfold, D. G. Fong, C. Lewis, P. E.L. Clarke, M. K. Jones, R. W. Springer, Sachio Komamiya, Theodoros Geralis, M. Gruwe, A. T. Watson, J. Gascon, Otmar Biebel, J. P. Martin, N. I. Geddes, Marco Verzocchi, Michael Hildreth, D. S. Koetke, Marcello Mannelli, Georges Azuelos, Dave Charlton, Matthias Schröder, E. Tsur, M. Boutemeur, F. S. Merritt, I. J. Bloodworth, C. M. Hawkes, R. W. L. Jones, K. W. Bell, R. Bürgin, S. De Jong, J. Letts, N. L. Rodning, E. Couto e do Silva, B. Poli, M. Thiergen, H. Lafoux, R. Lahmann, J. C. Hill, B. C. Shen, Misao Sasaki, Yoram Rozen, D. C. Imrie, M. Hansroul, T. P. Kokott, A. Luig, Norbert Wermes, Sherry Towers, T. Kawamoto, M. Foucher, J. Lauber, J. Bechtluft, J. A. McKenna, Gideon Bella, C. H. Shepherd-Themistocleous, Silvia Arcelli, T. J. Smith, W. J. McDonald, G. P. Siroli, S. Orito, H. Przysiezniak, M. Rosvick, H. J. Burckhart, A. N. Bell, Jacqueline Batley, M. F. Turner-Watson, M. Morii, A. Joly, Peter R Hobson, P. Routenburg, Ekg Sarkisyan, F. Strumia, S. D. Talbot, S. Yamashita, P. Scharff-Hansen, P. Igo-Kemenes, K. Stephens, Siegfried Bethke, M. Schumacher, E. Lefebvre, A. K. Honma, W. G. Scott, D. Karlen, T. Omori, I. Nakamura, S. B. Anderson, R. J. Homer, P. Szymanski, P. W. Jeffreys, K. Ishii, H. Jeremie, A. M. Smith, E. A. Mckigney, N. K. Watson, F. Odorici, C. Sbarra, H. M. Fischer, C. R. Jones, P. Giacomelli, T. Behnke, Richard Nisius, W. P. Lai, G. Vasseur, Andris Skuja, A. A. Carter, D. Glenzinski, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, Achim Stahl, P. A. Hart, R. E. Hughes-Jones, R. Bartoldus, S. Petzold, G. D. Long, G. G. Hanson, M. J. Oreglia, J. Goldberg, H. O. Ogren, Marco Cuffiani, P. Poffenberger, Tetsuro Mashimo, P. Gagnon, Volker Blobel, Carsten Daniel Burgard, B. Nijjhar, M. J. Pearce, D. R. Ward, T. Kress, V. Gibson, J. Allison, Christoph Geich-Gimbel, O. Schaile, A. I. McNab, A. Sittler, G. Giacomelli, J. M. Roney, B. Nellen, G. D. Lafferty, Stefan Schmitt, J. Palinkas, B. Schmitt, W. Mohr, H. M. Bosch, A. Posthaus, H-C. Schultz-Coulon, M. Hapke, Stephen Lloyd, Sven Menke, F. X. Gentit, G. N. Patrick, Kiyotomo Kawagoe, J. W. Gary, J. J. Ward, P. Vikas, J. E. Conboy, A. Fürtjes, M. Tecchio, J. R. Carter, S. M. Gascon-Shotkin, M. S. Dixit, Frans Meijers, K. Sachs, Shlomo Dado, M. J. Kobel, A. S. Turcot, H. G. Evans, M. J. Goodrick, P. Mättig, Shoji Asai, H. Mes, I. P. Duerdoth, G. Yekutieli, Ron Folman, P. Weber, D. E. Hutchcroft, P. Schütz, R. Kowalewski, Eduardo Ros, D. Axen, A. Jawahery, Frank Fiedler, I. Cohen, A. Rooke, M. A. Thomson, D. Lanske, S. A. Robins, Daniel Lellouch, P. Fath, W. R. Gibson, U. Ruppel, Reda Tafirout, Klaus Kurt Desch, D. M. Strom, W. Gorn, M. R. Ingram, R. Van Kooten, P. Pfeifenschneider, Takehiko Mori, B. J. King, P. Utzat, A. M. Rossi, C. Charlesworth, S. R. Lautenschlager, H. A. Neal, P. G. Estabrooks, R. K. Keeler, Gunter Wolf, Peter Sherwood, U. Müller, K. Ametewee, Giora Mikenberg, T. Hilse, D. L. Rees, A. J. Martin, T. Tsukamoto, J. Patt, J. G. Layter, R. G. Kellogg, M. Steiert, R. Rylko, C. Dallapiccola, V. Zacek, Alexander Wagner, Gideon Alexander, P. Kyberd, Paolo Capiluppi, P. M. Watkins, J. Ludwig, F. Scharf, German Martinez, K. Runge, P. Bock, Csaba Hajdu, Stefano Marcellini, S. Braibant, A. D. Schaile, Gabriella Pasztor, Ehud Duchovni, Randall Sobie, Michael Schulz, Stan Bentvelsen, W. Matthews, P. Schenk, C. Y. Chang, B. Stockhausen, F. K. Loebinger, O. C. Cooke, M. Jimack, J. Steuerer, Joleen Pater, C. K. Hargrove, A. Michelini, P. Taras, R. Howard, G. A. Snow, C. P. Ward, J. S. White, R. Giacomelli, E. K. U. Gross, A. Gaidot, Claudio Grandi, B. T. Bouwens, M. Sproston, Stefan Kluth, Shlomit Tarem, S. Söldner-Rembold, N. Altekamp, C.J. Beeston, Satoshi Tanaka, T. Kobayashi, T. G. Shears, R. M. Brown, D Chrisman, Lorne Levinson, J. von Krogh, Guenter Duckeck, P. S. Wells, A. Skillman, R. J. Hawkings, Abish Malik, Julie Kirk, T. R. Wyatt, C. Hartmann, D. E. Plane, L. A. del Pozo, D. J. Miller, R. J. Barlow, Stephen Hillier, F. Wäckerle, G. M. Dallavalle, T. J. McMahon, M. Evans, R. K. Carnegie, O. Runolfsson, M. Fierro, J. E.G. Edwards, D. M. Gingrich, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, P. Berlich, S. W. O'Neale, K. J. Anderson, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, U. Jost, R. Mir, R. D. Heuer, F. G. Oakham, E. L. Barberio, Robert McPherson, Mathieu Doucet, Fabrizio Fabbri, K. Nagai, D. R. Rust, A. M. Lee, E. von Törne, M. Bobinski, J. A. Wilson, D. Lazic, G. W. Wilson, M. Hauschild, S. A. Wotton, S. L. Chu, C. Markus, G. T. Jones, E. H. Vokurka, M. Starks, T. R. Junk, Gregor Herten, B. Wilkens, J. E. Pilcher, and J. E. Bloomer
Subjects: Nuclear physics, Baryon, Physics, Antiparticle, Particle physics, Physics and Astronomy (miscellaneous), Octet, Isospin, Electron–positron annihilation, Hadron, Hyperon, Production (computer science), Particle Physics - Experiment
Abstract: The production rates of the $J_{P}={1⩈er 2}^{+}$ octet Σ baryons in hadronic Z0 decays have been measured using the OPAL detector at LEP. The inclusive production rates per hadronic Z0 decay of the three isospin states (including the respective antiparticle) have been separately measured for the first time: $άtrix {n_{Sigma^{+}}=0.099pm 0.008pm 0.013ŗ n_{Sigma^{0}}=0.071pm 0.012pm 0.013ŗ n_{Sigma^{-}}=0.083pm 0.006pm 0.009ŗ}$ where the first error is statistical and the second is systematic. Differential cross-sections are also presented for the Σ+ and Σ− and compared with JETSET and HERWIG predictions. Assuming full isospin symmetry, the average inclusive rate is: ${1⩈er 3}[n_{Sigma^{+}+Sigma^{0}+Sigma^{-}}]=0.084pm 0.005 ({⤪ stat.}) pm 0.008 ({⤪ syst.})$.
Published: 1996

Catalog

Books, media, physical & digital resources

See catalog results

Searchworks

Select search scope, currently: Articles Catalog books, media & more in Jio Institute collections Articles journal articles & other e-resources

Search

Search Constraints

Refine your results

Search Limiters

Topic

Publication Year Range

Language

Publication Type

Journal

Database

Publisher

347 results on '"I. J., Bloodworth"'

Search Results

Catalog

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources