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1. Measurement of the τ− → h− π0ντ and τ− → h− ⩾ 2π0ντ branching ratios

Author

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

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle decay, Branching fraction, Electron–positron annihilation, Analytical chemistry, Branching (polymer chemistry), Selection criterion
Abstract

The branching ratios of the τ− → h− π0vτ and τ− → h− ⩾ 2π0vτ decays (where h− is either a π− or K−) are measured using the OPAL detector at LEP. The two branching ratios are simultaneously measured using separate selection criteria and are found to be Bh− π0 = (26.25 ± 0.35 ± 0.52)%, Bh− ⩾ 2π0 = (9.89 ± 0.34 ± 0.55)%Bh− π0 + Bh− ⩾ 2π0 = (36.14 ± 0.33 ± 0.58)%, where the first error is statistical and the second is systematic.

Published
1994

2. Search for the minimal Standard Model Higgs boson

Author

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

Subjects
Physics, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Elementary particle, Standard Model, Nuclear physics, Minimal model, Particle mass, Higgs boson, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

A search for the Minimal Standard Model Higgs boson (H0) has been performed with data from e+e− collisions collected by the OPAL detector at LEP. The search was made for events of the types e+e−→(e+e−,μ+μ− or νν)H0, H0→qq and was based on approximately 78 pb−1 of data taken at center-of-mass energies between 88 and 95 GeV in the years 1990–1993. The present study, combined with previous OPAL publications, excludes the existence of a Minimal Standard Model Higgs boson with mass below 56.9 GeV at the 95% confidence level.

Published
1994

3. Measurement of the Production Rates of Charged Hadrons in $e^{+}e^{-}$ Annihilation at the $Z^{0}$

Author

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

Subjects
Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Hadron, Monte Carlo method, Nuclear physics, Baryon, Momentum, High Energy Physics::Experiment, Engineering (miscellaneous), Particle Physics - Experiment, Bar (unit)
Abstract

The inclusive production rates of π±,K± andp\(\bar p\) inZ0 decays have been measured with the OPAL detector at LEP. Using the energy loss measurement in the jet chamber, the momentum range up to the beam energy (45.6 GeV/c) has been covered. Differential cross sections and total particle yields are given. Comparisons of the inclusive momentum spectra and the total rates with predictions of the JETSET and the HERWIG Monte Carlo model are presented. The total single rates are found to be 17.05±0.43 π±, 2.42±0.13K± and 0.92±0.11p\(\bar p\) per hadronic event. Predictions of JETSET for cross sections and total rates agree very well for π±; however, for momenta greater than 4 GeV/c,K± rates are underestimated and\(\bar p\) rates are overestimated. Combined with data of other particle species there is evidence that the peak positions in the ξ=ln(1/x p ) distributions show a different mass dependence for mesons and baryons. However, both JETSET and HERWIG Monte Carlo predictions agree with the observed data.

Published
1994

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