Author: "R. Humbert" - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"R. Humbert"' showing total 311 results

Start Over Author "R. Humbert"

311 results on '"R. Humbert"'

1. ARIA digital anamorphosis: Digital transformation of health and care in airway diseases from research to practice

Author: Bousquet, Jean Anto, Josep M. Bachert, Claus Haahtela, Tari and Zuberbier, Torsten Czarlewski, Wienczyslawa Bedbrook, Anna and Bosnic-Anticevich, Sinthia Walter Canonica, G. Cardona, Victoria Costa, Elisio Cruz, Alvaro A. Erhola, Marina and Fokkens, Wytske J. Fonseca, Joao A. Illario, Maddalena and Ivancevich, Juan-Carlos Jutel, Marek Klimek, Ludger Kuna, Piotr Kvedariene, Violeta Le, L. T. T. Larenas-Linnemann, Desiree E. Laune, Daniel Lourenco, Olga M. Melen, Erik and Mullol, Joaquim Niedoszytko, Marek Odemyr, Mikaela Okamoto, Yoshitaka Papadopoulos, Nikos G. Patella, Vincenzo Pfaar, Oliver Pham-Thi, Nhan Rolland, Christine Samolinski, Boleslaw Sheikh, Aziz Sofiev, Mikhail Suppli Ulrik, Charlotte Todo-Bom, Ana Tomazic, Peter-Valentin and Toppila-Salmi, Sanna Tsiligianni, Ioanna Valiulis, Arunas and Valovirta, Erkka Ventura, Maria-Teresa Walker, Samantha and Williams, Sian Yorgancioglu, Arzu Agache, Ioana Akdis, Cezmi A. Almeida, Rute Ansotegui, Ignacio J. Annesi-Maesano, Isabella Arnavielhe, Sylvie Basagana, Xavier D. Bateman, Eric Bedard, Annabelle Bedolla-Barajas, Martin Becker, Sven and Bennoor, Kazi S. Benveniste, Samuel Bergmann, Karl C. and Bewick, Michael Bialek, Slawomir E. Billo, Nils and Bindslev-Jensen, Carsten Bjermer, Leif Blain, Hubert Bonini, Matteo Bonniaud, Philippe Bosse, Isabelle Bouchard, Jacques and Boulet, Louis-Philippe Bourret, Rodolphe Boussery, Koen and Braido, Fluvio Briedis, Vitalis Briggs, Andrew Brightling, Christopher E. Brozek, Jan Brusselle, Guy Brussino, Luisa and Buhl, Roland Buonaiuto, Roland Calderon, Moises A. and Camargos, Paulo Camuzat, Thierry Caraballo, Luis Carriazo, Ana-Maria Carr, Warner Cartier, Christine Casale, Thomas and Cecchi, Lorenzo Cepeda Sarabia, Alfonso M. H. Chavannes, Niels and Chkhartishvili, Ekaterine Chu, Derek K. Cingi, Cemal and Correia de Sousa, Jaime Costa, David J. Courbis, Anne-Lise and Custovic, Adnan Cvetkosvki, Biljana D'Amato, Gennaro da Silva, Jane Dantas, Carina Dokic, Dejan Dauvilliers, Yves and De Feo, Giulia De Vries, Govert Devillier, Philippe Di Capua, Stefania Dray, Gerard Dubakiene, Ruta Durham, Stephen R. Dykewicz, Marc Ebisawa, Motohiro Gaga, Mina El-Gamal, Yehia Heffler, Enrico Emuzyte, Regina Farrell, John and Fauquert, Jean-Luc Fiocchi, Alessandro Fink-Wagner, Antje and Fontaine, Jean-Francois Fuentes Perez, Jose M. Gemicioglu, Bilun and Gamkrelidze, Amiran Garcia-Aymerich, Judith Gevaert, Philippe Gomez, Rene Maximiliano Gonzalez Diaz, Sandra and Gotua, Maia Guldemond, Nick A. Guzman, Maria-Antonieta and Hajjam, Jawad Huerta Villalobos, Yunuen R. Humbert, Marc and Iaccarino, Guido Ierodiakonou, Despo Iinuma, Tomohisa and Jassem, Ewa Joos, Guy Jung, Ki-Suck Kaidashev, Igor and Kalayci, Omer Kardas, Przemyslaw Keil, Thomas Khaitov, Musa and Khaltaev, Nikolai Kleine-Tebbe, Jorg Kouznetsov, Rostislav and Kowalski, Marek L. Kritikos, Vicky Kull, Inger La Grutta, Stefania Leonardini, Lisa Ljungberg, Henrik and Lieberman, Philip Lipworth, Brian Lodrup Carlsen, Karin C. and Lopes-Pereira, Catarina Loureiro, Claudia C. Louis, Renaud and Mair, Alpana Mahboub, Bassam Makris, Michael Malva, Joao and Manning, Patrick Marshall, Gailen D. Masjedi, Mohamed R. and Maspero, Jorge F. Carreiro-Martins, Pedro Makela, Mika and Mathieu-Dupas, Eve Maurer, Marcus De Manuel Keenoy, Esteban and Melo-Gomes, Elisabete Meltzer, Eli O. Menditto, Enrica and Mercier, Jacques Micheli, Yann Miculinic, Neven Mihaltan, Florin Milenkovic, Branislava Mitsias, Dimitirios I. Moda, Giuliana Mogica-Martinez, Maria-Dolores Mohammad, Yousser and Montefort, Steve Monti, Ricardo Morais-Almeida, Mario and Mosges, Ralph Munter, Lars Muraro, Antonella Murray, Ruth and Naclerio, Robert Napoli, Luigi Namazova-Baranova, Leyla and Neffen, Hugo Nekam, Kristoff Neou, Angelo Nordlund, Bjorn and Novellino, Ettore Nyembue, Dieudonne O'Hehir, Robyn and Ohta, Ken Okubo, Kimi Onorato, Gabrielle L. Orlando, Valentina Ouedraogo, Solange Palamarchuk, Julia Pali-Scholl, Isabella Panzner, Peter Park, Hae-Sim Passalacqua, Gianni and Pepin, Jean-Louis Paulino, Ema Pawankar, Ruby Phillips, Jim Picard, Robert Pinnock, Hilary Plavec, Davor Popov, Todor A. Portejoie, Fabienne Price, David Prokopakis, Emmanuel P. Psarros, Fotis Pugin, Benoit Puggioni, Francesca and Quinones-Delgado, Pablo Raciborski, Filip and Rajabian-Soderlund, Rojin Regateiro, Frederico S. Reitsma, Sietze Rivero-Yeverino, Daniela Roberts, Graham Roche, Nicolas Rodriguez-Zagal, Erendira Rolland, Christine and Roller-Wirnsberger, Regina E. Rosario, Nelson Romano, Antonino and Rottem, Menachem Ryan, Dermot Salimaki, Johanna and Sanchez-Borges, Mario M. Sastre, Joaquin Scadding, Glenis K. and Scheire, Sophie Schmid-Grendelmeier, Peter Schunemann, Holger J. and Sarquis Serpa, Faradiba Shamji, Mohamed Sisul, Juan-Carlos and Sofiev, Mikhail Sole, Dirceu Somekh, David Sooronbaev, Talant Sova, Milan Spertini Spranger, Otto Stellato, Cristiana Stelmach, Rafael Thibaudon, Michel To, Teresa and Toumi, Mondher Usmani, Omar Valero, Antonio A. Valenta, Rudolph Valentin-Rostan, Marylin Pereira, Marilyn Urrutia and van der Kleij, Rianne Van Eerd, Michiel Vandenplas, Olivier and Vasankari, Tuula Vaz Carneiro, Antonio Vezzani, Giorgio and Viart, Frederic Viegi, Giovanni Wallace, Dana Wagenmann, Martin Wang, De Yun Waserman, Susan Wickman, Magnus and Williams, Dennis M. Wong, Gary Wroczynski, Piotr Yiallouros, Panayiotis K. Yusuf, Osman M. Zar, Heather J. Zeng, Stephane and Zernotti, Mario E. Zhang, Luo Shan Zhong, Nan Zidarn, Mihaela
Abstract: Digital anamorphosis is used to define a distorted image of health and care that may be viewed correctly using digital tools and strategies. MASK digital anamorphosis represents the process used by MASK to develop the digital transformation of health and care in rhinitis. It strengthens the ARIA change management strategy in the prevention and management of airway disease. The MASK strategy is based on validated digital tools. Using the MASK digital tool and the CARAT online enhanced clinical framework, solutions for practical steps of digital enhancement of care are proposed.
Published: 2021

2. Open-structure resonant technique for measuring the dielectric properties of materials.

Author: William R. Humbert and Waymond R. Scott Jr.
Published: 1998
Full Text: View/download PDF

3. Frequency of the carrier state for X-linked chronic granulomatous disease among females with lupus erythematosus

Author: William L. Weston, Patricia A. Dearmey, Christine H. Thoren, Charles B. Fishman, and James R. Humbert
Subjects: Adult, Blood Bactericidal Activity, congenital, hereditary, and neonatal diseases and abnormalities, Neutrophil bactericidal activity, Neutrophils, Granulomatous Disease, Chronic, Chronic granulomatous disease, immune system diseases, hemic and lymphatic diseases, Genetics, medicine, Humans, Lupus Erythematosus, Systemic, Genetics (clinical), Aged, Sex Chromosomes, Lupus erythematosus, business.industry, Carrier state, Middle Aged, medicine.disease, Immunology, Phagocyte Bactericidal Dysfunction, Female, Abnormality, Skin lesion, business
Abstract: Carriers for chronic granulomatous disease (CGD) and patients with lupus erythematosus (LE) share several characteristics: They are mostly females, they reduce nitroblue tetra-zolium (NBT) poorly in their neutrophils, and, in some cases, they have similar skin lesions. We thus investigated 19 female LE patients for the presence of laboratory findings characteristic of the carrier state for CGD. None of these patients turned out to have the combined abnormality of neutrophil bactericidal activity and neutrophil NBT-reduction that is diagnostic of CGD carrier state in the X-linked form. An increased frequency of CGD carriers among female LE patients thus appears to be unlikely. Why some CGD carriers develop skin lesions typical of LE remains unexplained.
Published: 2008

4. Management and in-hospital outcome of patients with acute myocardial infarction admitted to intensive care units at the turn of the century: results from the French nationwide USIC 2000 registry

Author: Nathalie Genès, J-M Lablanche, R. Humbert, J-P Cambou, Pascal Gueret, Guy Hanania, Laurent Vaur, Nicholas Danchin, Didier Blanchard, Y. Boutalbi, and P. Clerson
Subjects: Adult, Male, medicine.medical_specialty, genetic structures, Critical Care, Myocardial Infarction, Infarction, Myocardial Reperfusion, Cardiovascular Medicine, law.invention, law, Internal medicine, Intensive care, medicine, Humans, Thrombolytic Therapy, Prospective Studies, Registries, cardiovascular diseases, Myocardial infarction, Angioplasty, Balloon, Coronary, Stroke, Aged, Killip class, Aged, 80 and over, Analysis of Variance, Interventional cardiology, business.industry, ST elevation, Middle Aged, medicine.disease, Intensive care unit, Surgery, Hospitalization, Treatment Outcome, cardiovascular system, Female, France, Cardiology and Cardiovascular Medicine, business
Abstract: Objective: To assess actual practices and in-hospital outcome of patients with acute myocardial infarction on a nationwide scale. Methods: Of 443 intensive care units in France, 369 (83%) prospectively collected data on all cases of infarction (within < 48 hours of symptom onset) in November 2000. Results: 2320 patients (median age 68 years, 73% men) were included, of whom 83% had ST segment elevation infarction (STEMI). Patients without STEMI were older and had a more frequent history of cardiovascular disease. Median time to admission was 5.0 hours for patients with and 6.5 hours for those without STEMI. Reperfusion therapy was used for 53% of patients with STEMI (thrombolysis 28%, primary angioplasty 25%). In-hospital mortality was 8.7% (5.5% of patients without and 9.3% of those with STEMI). Multivariate analysis found that age, Killip class, lower blood pressure, higher heart rate on admission, anterior location of infarct, STEMI, diabetes mellitus, previous stroke, and no current smoking independently predicted in-hospital mortality. At hospital discharge, 95% received antiplatelet agents, 75% received β blockers, and over 60% received statins. Angiotensin converting enzyme inhibitors were prescribed for 40% of the patients without and 52% of those with ST elevation. Conclusions: This nationwide registry, including all types of centres irrespective of their size and experience, shows continued improvement in patient care and outcomes. Time from symptom onset to admission, however, has not improved in recent years and reperfusion therapy is used for just over 50% of patients with STEMI, with an increasing use of primary angioplasty.
Published: 2004

5. Évolution de la prise en charge et du pronostic de l'infarctus du myocarde en France entre 1995 et 2000 : résultats des études USIK 1995 et USIC 2000

Author: Jean-Pierre Cambou, R. Humbert, Jean-Marc Lablanche, Nicolas Danchin, Y. Boutalbi, P. Clerson, Laurent Vaur, Nathalie Genès, Didier Blanchard, Guy Hanania, and Pascal Gueret
Subjects: Secondary prevention, medicine.medical_specialty, Ejection fraction, business.industry, medicine.medical_treatment, medicine.disease, Surgery, Reperfusion therapy, Internal medicine, Intensive care, Angioplasty, Cohort, medicine, Cardiology, Myocardial infarction, Medical prescription, Cardiology and Cardiovascular Medicine, business
Abstract: We assessed the in-hospital management and short- and long-term outcomes of two series of patients admitted for acute myocardial infarction, 5 years apart, in France. The most recent cohort was younger and with a less frequent history of cardiac diseases, but was more often diabetic and with anterior infarcts. Five-day mortality significantly improved from 7.7% to 6.1% (P < 0.03) and 1-year survival was also less in the most recent period (15% versus 19%, P < 0.01). Multivariate analyses showed that the period of inclusion (2000 versus 1995) was an independent predictor of both short- and long-term mortality. In analyses restricted to the patients who were alive by day 5, initial treatment with statins was associated with a 38% decrease in the risk of death at 1 year. Likewise, in patients with left ventricular ejection fraction ≤35%, the early prescription of ACE inhibitors was associated with a 41% reduction in the risk of 1-year mortality. Thus, in the real world setting, a continued decline in 1-year mortality is observed in patients admitted to intensive care units for recent acute myocardial infarction. This goes along with a shift in reperfusion therapy towards a broader use of coronary angioplasty and with an increased use of the early prescription of recognised secondary prevention medications.
Published: 2004

6. Modeling of resin transfer molding of composite materials with oriented unidirectional plies

Author: Douglas S. Cairns, Dell R Humbert, and John F. Mandell
Subjects: Image stitching, Permeability (earth sciences), Materials science, Darcy's law, Fabrication, Transfer molding, Mechanics of Materials, Bundle, Flow (psychology), Ceramics and Composites, Composite material, Open-channel flow
Abstract: One of the limiting factors in the application of composites to primary structural applications has been the relatively high cost of converting basic material forms to structural configurations. One potential manufacturing method is Resin Transfer Molding (RTM). In RTM, resin is injected into a fibrous preform. In this study, the processing parameters are defined and investigated analytically and experimentally. A basic model is proposed that incorporates Darcy's law in fibrous bundle regions and channel flow equations between bundles. A model description is provided along with experimental procedures. The model results are compared to experimental data for unidirectional, stitched preforms, and multi-layer configurations with good experimental agreement. It was found that incorporating channel flow is an important feature for properly modeling the RTM process. Pressure profiles, resin velocities, and resin flow fronts are predicted accurately, and are available for manufacturing process development. The same materials were compared to fully stitched preforms. It was found that although the shapes for resin flow are similar between experimental and analytical results, the stitching affects the permeability such that unidirectional ply data do not accurately capture the times for resin flow.
Published: 1999

7. Biomimetic Assembly of Nanostructured Materials

Author: D.W. Frech, H. Fong, R. Humbert, and M. Sarikaya
Subjects: Materials science, Hierarchy (mathematics), Mechanics of Materials, Mechanical Engineering, Nanostructured materials, General Materials Science, Nanotechnology, Condensed Matter Physics, Hybrid material
Published: 1998

8. Measurement of the permittivity and loss tangent of dielectric sheets

Author: Waymond R. Scott and William R. Humbert
Subjects: Permittivity, Materials science, business.industry, Conduction loss, Electrical engineering, Dielectric, Fixture, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Dissipation factor, Dielectric loss, Electrical and Electronic Engineering, Composite material, business, Microwave, Sheet resistance
Abstract: A previously introduced resonant measurement technique is extended to include dielectric sheets. The technique is not limited by the sheet's thickness or dielectric constant because it involves a full-wave analysis of the fixture. A method to account for conduction loss due to the surface resistance of the metal walls of the fixture is presented. Experimental results are presented and compared to previously reported values, and are in excellent agreement. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 15: 355–358, 1997.
Published: 1997

9. Measurement of $$\Gamma (Z^0 \to b\bar b)/\Gamma (Z^0 \to hadrons)$$ using a double tagging method

Author: H. J. Burckhart, Jacqueline Batley, P. Igo-Kemenes, H. Jeremie, P. Scharff-Hansen, R. E. Hughes-Jones, U. Maur, A. Höcker, D. Axen, A. Jawahery, R. Van Kooten, E. do Couto e Silva, D. Pitman, A. M. Smith, Shlomo Dado, Xinchou Lou, Peter Sherwood, R. W. Springer, Alexander Wagner, M. H. Lehto, G. Vasseur, H. Mes, J. Hagemann, J. Ludwig, K. Runge, P. Bock, Giora Mikenberg, B. Lorazo, I. P. Duerdoth, G. G. Hanson, A. I. McNab, J. Goldberg, Otmar Biebel, T. G. Shears, B. Nellen, P. Leblanc, D. G. Charlton, D. L. Wagner, H. Deng, R. Humbert, D. M. Gingrich, F. Liu, R. Mir, J. von Krogh, Andris Skuja, H. Przysiezniak, P. Schenk, S. Braibant, C. M. Hawkes, D. A. Hinshaw, Daniel Lellouch, G. A. Snow, C. P. Ward, R. Bartoldus, D. L. Rees, S. G. Clowes, J. Lauber, M. Fierro, M. S. Dixit, Z. Li, Frans Meijers, G. D. Long, Tetsuro Mashimo, H. G. Evans, Dave Robinson, Takehiko Mori, P. Berlich, H. Takeda, F. G. Oakham, H. O. Ogren, M. J. Goodrick, M. Yurko, P. W. Jeffreys, T. J. McMahon, M. Hauschild, I. Cohen, M. F. Turner-Watson, M. Morii, J. G. Layter, S. W. O'Neale, E. L. Barberio, Christoph Geich-Gimbel, Norbert Wermes, Sherry Towers, T. Kawamoto, K. J. Anderson, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, J. Schwiening, Peter R Hobson, R. Kowalewski, J. Hart, R. K. Carnegie, T. Behnke, C. Markus, P. Le Du, B. Fabbro, C. Charlesworth, E. Lefebvre, C. Dallapiccola, J. D. Gillies, J. A. Wilson, W. Gorn, P. Routenburg, D. R. Rust, T. W. Pritchard, A. Skillman, P. A. Hart, P. Bright-Thomas, I. J. Bloodworth, S. Orito, M. Rosvick, Tohru Takeshita, F. Odorici, D. E. Plane, J. C. Clayton, G. Giacomelli, S. L. Chu, Gunter Wolf, F. X. Gentit, Guenter Duckeck, A. Buijs, Gideon Alexander, P. Bentkowski, T. Wlodek, Paolo Capiluppi, R. J. Barlow, D. M. Strom, C. Stegmann, C. Y. Chang, M. J. Pearce, D. J. Miller, G. M. Dallavalle, M. Sproston, J. J. Ward, M. A. Thomson, A. M. Lee, M. Settles, Yoram Rozen, M. Foucher, P. Gagnon, R.J. Akers, M. J. Oreglia, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, J. P. Martin, Georges Azuelos, Barry King, Paolo Giacomelli, T. Tsukamoto, H. Fukui, M. Hansroul, Michael Kobel, N. Tesch, S. Wotton, Silvia Arcelli, R. Ströhmer, P. A. Elcombe, O. Schaile, J. E. Conboy, A. Fürtjes, S. De Jong, J. F. Kral, K. W. Bell, C. Sbarra, V. H. Winterer, T. Hilse, G. T. Zorn, D. Rigby, R. J. Hemingway, O. Runolfsson, G. W. Wilson, D. Karlen, C. Burgard, B. W. Kennedy, A. Yeaman, P. D. Grannis, J. R. Carter, G. N. Patrick, M. Fanti, J. Becker, Erez Etzion, Stephen Lloyd, M. Tecchio, Robert M Brown, Matthias Schröder, James Pinfold, A. J. Martin, P. Jovanovic, H. Lafoux, H. M. Bosch, Wolfram Dietrich Zeuner, D. G. Fong, F. S. Merritt, Michael Dittmar, Austin Ball, C. H. Shepherd-Themistocleous, C. Beeston, Peter Krieger, Claudio Grandi, F. Scharf, Stefan Kluth, Shlomit Tarem, J. C. Hill, Misao Sasaki, P. Poffenberger, P. Szymanski, Peter Fischer, Manuella Vincter, Alessandro Montanari, Sachio Komamiya, G. Yekutieli, B. C. Shen, Theodoros Geralis, E. Ros, A. T. Watson, A. D. Schaile, A. A. Carter, Ron Folman, Roger Jones, J. Steuerer, S. Rossberg, C. J. Oram, R. J. Homer, J. Gascon, H. von der Schmitt, Gregor Herten, P. Schütz, N. K. Watson, J. A. McKenna, Eilam Gross, R. P. Middleton, B. Wilkens, R. Howard, C. Darling, T. J. Smith, J. P. Pansart, T. P. Kokott, C. Jui, A. Luig, M. G. Rison, K. Stephens, Claude Leroy, A. Gaidot, Siegfried Bethke, A. K. Honma, J. E. Pilcher, Stan Bentvelsen, Ehud Duchovni, R. D. Heuer, J. R. McNutt, W. Mohr, Fabrizio Fabbri, P. Mättig, Shoji Asai, D. Van den plas, Margret Fincke-Keeler, W. R. Gibson, A. Posthaus, B. Nijjhar, W. G. Scott, A. Astbury, J. M. Roney, M. Jimack, A. Beck, H. Ihssen, Marco Cuffiani, V. Gibson, E. Heflin, J. W. Gary, Lorne Levinson, U. Müller, P. D. Phillips, P. S. Wells, Gilles Beaudoin, Madjid Boutemeur, D. R. Ward, Terry Richard Wyatt, S. W. Gensler, S. J. Hillier, T. Kobayashi, Marcello Mannelli, J. E. Duboscq, M. Coupland, C. K. Hargrove, D. Hochman, P. G. Estabrooks, R. K. Keeler, P. Pfister, P. M. Watkins, M. J. Losty, C. Moisan, G. A. Beck, Achim Stahl, P. Teixeira-Dias, B. Schmitt, John Allison, R. G. Kellogg, D. S. Koetke, Stefano Marcellini, James Letts, J. Mildenberger, R. Lahmann, M. W. Redmond, D. C. Imrie, G. P. Siroli, J. King, B. Stockhausen, Paul Kyberd, Christoph Schwick, F. K. Loebinger, A. M. Rossi, H. M. Fischer, A. Michelini, S. A. Robins, R. Giacomelli, N. I. Geddes, B. Poli, Kiyotomo Kawagoe, P. Weber, and Gideon Bella
Subjects: Physics, Systematic error, Particle physics, Muon, Physics and Astronomy (miscellaneous), Model prediction, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Elementary particle, Standard Model, Nuclear physics, High Energy Physics::Experiment, Engineering (miscellaneous), Particle Physics - Experiment, Bar (unit)
Abstract: The fraction of$Z^0 \to b\bar b$; events in hadronicZ0 decays has been measured using the data collected by OPAL in 1992 and 1993. The presence of electrons or muons from semileptonic decays of bottom hadrons and the detection of bottom hadron decay vertices were used together to obtain an event sample enriched in$Z^0 \to b\bar b$ decays. To reduce the systematic error on the measurement of the$Z^0 \to b\bar b$ fraction, the efficiency of the$b\bar b$ event tagging was obtained from the data by comparing the numbers of events having a bottom signature in either one or both thrust hemispheres. A value of $$\frac{{\Gamma (Z^0 \to b\bar b)}}{{\Gamma (Z^0 \to hadrons)}} = 0.2171 \pm 0.0021 \pm 0.0021$$ was obtained, where the first error is statistical and the second systematic. The uncertainty on the decay width$\Gamma (Z^0 \to c\bar c)$ is not included in these errors. A fractional variation of this width by ±8% about its Standard Model prediction would result in a variation of the measured$Z^0 \to b\bar b$ fraction of ±0.0015.
Published: 1995

10. Determination of event shape distributions and α s b from $$Z^0 \to b\bar b$$ events at LEP

Author: A. Yeaman, P. D. Grannis, T. J. Smith, Sachio Komamiya, Theodoros Geralis, E. Ros, Z. Li, M. F. Turner-Watson, M. Morii, Peter R Hobson, P. Routenburg, Otmar Biebel, K. Stephens, B. C. Shen, T. P. Kokott, A. Luig, D. G. Charlton, D. L. Wagner, J. R. McNutt, A. Astbury, H. Mes, H. Deng, R. Humbert, Siegfried Bethke, N. K. Watson, U. Müller, A. K. Honma, J. Mildenberger, D. Rigby, R. J. Hemingway, I. P. Duerdoth, A. J. Martin, B. Nijjhar, W. G. Scott, J. M. Roney, Margret Fincke-Keeler, James Pinfold, C. Y. Chang, R. Lahmann, D. C. Imrie, J. E. Duboseq, G. Mikenberg, T. J. McMahon, B. W. Kennedy, M. Yurko, D. G. Fong, J. Gascon, H. von der Schmitt, P. Jovanovic, C. K. Hargrove, G. G. Hanson, F. Liu, G. Giacomelli, Gunter Wolf, F. X. Gentit, N. I. Geddes, M. W. Redmond, J. W. Gary, Michael Kobel, S. Braibant, Norbert Wermes, Sherry Towers, Austin Ball, P. W. Jeffreys, T. Kobayashi, G. P. Siroli, J. King, P. Igo-Kemenes, T. Kawamoto, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Peter Krieger, P. Schenk, M. J. Losty, J. Schwiening, P. A. Hart, Christoph Schwick, H. Lafoux, P. Bright-Thomas, D. A. Hinshaw, Manuella Vincter, Alessandro Montanari, R. K. Carnegie, M. J. Pearce, F. S. Merritt, E. Lefebvre, W. Mohr, G. A. Snow, C. P. Ward, H. Jeremie, S. Orito, D. R. Ward, P. Poffenberger, R. Giacomelli, M. Rosvick, A. Posthaus, J. A. Wilson, S. Wotton, B. Poli, M. S. Dixit, D. L. Rees, R. E. Hughes-Jones, U. Maur, F. Odorici, R. Mir, P. S. Wells, S. W. O'Neale, Frans Meijers, Matthias Schröder, J. J. Ward, Hans-Christian Schultz-Coulon, Gregor Herten, M. A. Thomson, Marcello Mannelli, R. W.L. Jones, P. Pfister, D. R. Rust, J. C. Clayton, H. M. Fischer, Kiyotomo Kawagoe, Andris Skuja, J. Lauber, A. Höcker, Tohru Takeshita, J. A. McKenna, A. Michelini, A. Skillman, V. Gibson, A. I. McNab, R. G. Kellogg, G. D. Long, B. Wilkens, Terry Richard Wyatt, A. T. Watson, J. Goldberg, C. Darling, D. S. Koetke, Georges Azuelos, J. G. Layter, K. J. Anderson, E. do Couto e Silva, Michael Schulz, M. J. Oreglia, E. K. U. Gross, Tetsuro Mashimo, Stefano Marcellini, J. Steuerer, H. Takeda, B. Nellen, Barry King, James Letts, S. A. Robins, Shlomo Dado, P. Leblanc, T. Wlodek, F. G. Oakham, M. Coupland, M. Sproston, E. L. Barberio, J. P. Pansart, T. Behnke, K. W. Bell, D. Axen, A. Jawahery, R. J. Barlow, C. Charlesworth, H. Przysiezniak, S. G. Clowes, J. Hart, C. Dallapiccola, J. C. Hill, G. N. Patrick, J. R. Carter, M. Fierro, P. Weber, H. G. Evans, N. Tesch, J. E. Pilcher, W. Gorn, J. D. Gillies, M. J. Goodrick, P. Mättig, I. Cohen, Peter Sherwood, Peter Fischer, Marco Cuffiani, J. von Krogh, T. Hilse, P. A. Elcombe, P. Schütz, Shoji Asai, R. W. Springer, Alexander Wagner, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, O. Runolfsson, A. M. Lee, A. Buijs, D. M. Strom, A. Gaidot, J. Hagemann, J. Ludwig, K. Runge, P. Bock, J. P. Martin, M. Sasaki, Erez Etzion, C. Stegmann, David Robinson, Stefan Kluth, J. Becker, S. L. Chu, P. Scharff-Hansen, A. M. Rossi, C. Beeston, C. M. Hawkes, T. W. Pritchard, S. De Jong, Daniel Lellouch, Shlomit Tarem, H. Fukui, Claudio Grandi, F. Scharf, C. Sbarra, T. Tsukamoto, S. Rossberg, C. J. Oram, Madjid Boutemeur, Takehiko Mori, P. Gagnon, A. D. Schaile, R. Bartoldus, Michael Dittmar, R. P. Middleton, D. J. Miller, J. Allison, R. Ströhmer, G. Yekutieli, A. M. Smith, P. G. Estabrooks, R. K. Keeler, M. Hauschild, G. Vasseur, D. Hochman, B. Lorazo, H. O. Ogren, Christoph Geich-Gimbel, G. T. Zorn, P. M. Watkins, C. Markus, H. M. Bosch, Wolfram Dietrich Zeuner, R. J. Sobie, Silvia Arcelli, R. Howard, Claude Leroy, I. J. Bloodworth, R. Van Kooten, G. D. Lafferty, Paolo Giacomelli, D. Pitman, Guenter Duckeck, S. L. Lloyd, M. H. Lehto, J. E. Conboy, R.J. Akers, M. Settles, M. Hansroul, A. Fürtjes, P. Le Du, B. Fabbro, T. G. Shears, C. H. Shepherd-Themistocleous, D. M. Gingrich, P. Szymanski, R. J. Homer, C. Moisan, Gideon Bella, G. A. Beck, Achim Stahl, P. Teixeira-Dias, M. Tecchio, P. Berlich, H. J. Burckhart, M. Fanti, B. Schmitt, Jacqueline Batley, O. Schaile, C. Jui, Stan Bentvelsen, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, R. Kowalewski, Xinchou Lou, V. H. Winterer, W. R. Gibson, A. Beck, E. Heflin, Gideon Alexander, R. M. Brown, Paolo Capiluppi, Lorne Levinson, P. D. Phillips, Gilles Beaudoin, Ehud Duchovni, M. Jimack, H. Ihssen, S. W. Gensler, D. E. Plane, P. Bentkowski, S. J. Hillier, G. M. Dallavalle, Yoram Rozen, M. Foucher, G. W. Wilson, D. Karlen, C. Burgard, A. A. Carter, Ron Folman, and M. G. Rison
Subjects: Physics, Quark, Particle physics, Physics and Astronomy (miscellaneous), High Energy Physics::Lattice, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Elementary particle, Jet (particle physics), Vertex (geometry), Nuclear physics, High Energy Physics::Experiment, Parton shower, Engineering (miscellaneous), Event (probability theory)
Abstract: In hadronic Z0 decays collected by the OPAL experiment at LEP, event shape variables such as jet rates, jet masses, thrust and the energy-energy correlation for $$Z^0 \to b\bar b$$ events are compared to those for all flavours using secondary vertex information to tag the b quarks. The measured distributions are found to be well described by anO"(α s ) calculation for heavy quarks as well as by parton shower simulations. We also determine the ratio of the strong coupling constant for b quarks and all quarks, α b /α incl , from these distributions. We find $$\alpha _s^b /\alpha _s^{incl} = 0.994 \pm 0.005_{ - 0.012}^{ + 0.010} ,$$ where the errors are the statistical and systematic errors. The result can be converted into the ratio for b quarks relative to the complementary flavours udsc α b /α udsc =0.992±0.007 -0.015 +0.013 .
Published: 1995

11. Updated measurement of the τ lifetime

Author: R. Van Kooten, D. Pitman, M. H. Lehto, E. Lefebvre, S. L. Chu, T. G. Shears, F. Odorici, F. Liu, Margret Fincke-Keeler, D. M. Gingrich, G. Giacomelli, B. C. Shen, P. Schenk, P. Berlich, Siegfried Bethke, T. Hilse, A. K. Honma, B. Nijjhar, W. G. Scott, H. M. Fischer, M. S. Dixit, O. Runolfsson, J. Mildenberger, Gideon Bella, Frans Meijers, H. J. Burckhart, Gordon H. Hanson, Jacqueline Batley, C. M. Hawkes, Daniel Lellouch, A. Michelini, C. Beeston, M. Fanti, James Pinfold, Claudio Grandi, R. D. Heuer, M. J. Losty, Fabrizio Fabbri, P. Pfister, D. Van den plas, D. R. Rust, Takehiko Mori, P. Igo-Kemenes, F. S. Merritt, M. Yurko, D. G. Fong, M. W. Redmond, A. M. Lee, G. Beaudoin, J. Gascon, W. R. Gibson, H. Jeremie, H. von der Schmitt, P. W. Jeffreys, S. W. O'Neale, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, Xinchou Lou, S. A. Robins, H. Mes, R. E. Hughes-Jones, U. Maur, J. Steuerer, R.J. Akers, I. P. Duerdoth, A. Beck, E. Heflin, K. J. Anderson, J. P. Martin, J. W. Gary, M. J. Oreglia, Matthias Schröder, R. M. Brown, A. Höcker, Lorne Levinson, R. Lahmann, Silvia Arcelli, P. D. Phillips, J. A. McKenna, Tohru Takeshita, D. C. Imrie, P. Bright-Thomas, B. Stockhausen, Paul Kyberd, F. K. Loebinger, S. De Jong, Marcello Mannelli, J. E. Duboscq, Shlomo Dado, Sachio Komamiya, P. Poffenberger, E. do Couto e Silva, Georges Azuelos, Barry King, Peter Fischer, J. J. Ward, P. Scharff-Hansen, E. Barberio, Theodoros Geralis, D. A. Hinshaw, D. E. Plane, O. Schaile, K. W. Bell, E. Ros, A. T. Watson, Erez Etzion, G. P. Siroli, J. King, P. Schütz, M. A. Thomson, J. C. Hill, I. J. Bloodworth, P. Bentkowski, R. Bartoldus, C. Moisan, G. A. Beck, Marco Cuffiani, A. M. Smith, Christoph Schwick, G. M. Dallavalle, Achim Stahl, J. R. Carter, H. O. Ogren, Christoph Geich-Gimbel, Misao Sasaki, Stefan Kluth, Shlomit Tarem, G. N. Patrick, P. Teixeira-Dias, P. Le Du, B. Fabbro, M. Settles, G. Vasseur, B. Lorazo, Otmar Biebel, R. Giacomelli, T. Behnke, S. Rossberg, C. J. Oram, D. G. Charlton, D. L. Wagner, Kiyotomo Kawagoe, T. P. Kokott, A. Luig, Andris Skuja, Yoram Rozen, J. G. Layter, M. Foucher, Stephen Lloyd, G. D. Long, C. Y. Chang, B. Schmitt, H. Deng, R. Humbert, M. Tecchio, Tetsuro Mashimo, R. P. Middleton, C. Charlesworth, A. I. McNab, F. X. Gentit, J. E. Conboy, G. W. Wilson, A. Fürtjes, Michael Kobel, J. Goldberg, P. Weber, Gregor Herten, A. M. Rossi, H. Przysiezniak, D. Axen, A. Jawahery, Giora Mikenberg, D. Karlen, B. Nellen, W. Gorn, S. G. Clowes, C. Burgard, D. Hochman, P. A. Hart, B. Wilkens, P. Leblanc, T. Tsukamoto, Ehud Duchovni, Paolo Giacomelli, M. Hansroul, M. Fierro, H. Lafoux, T. J. Smith, K. Stephens, Peter Sherwood, M. Jimack, Z. Li, Norbert Wermes, Sherry Towers, Hans-Christian Schultz-Coulon, T. Kawamoto, A. Buijs, J. R. McNutt, M. J. Pearce, D. M. Strom, H. Ihssen, R. W. Springer, Alexander Wagner, J. Hagemann, C. H. Shepherd-Themistocleous, H. G. Evans, J. Ludwig, J. E. Pilcher, C. Dallapiccolla, S. W. Gensler, M. J. Goodrick, K. Runge, P. Bock, I. Cohen, John Allison, C. Darling, S. Orito, M. F. Turner-Watson, M. Morii, M. Rosvick, S. J. Hillier, R. J. Homer, T. Kobayashi, Randall Sobie, Peter R Hobson, S. Braibant, Gunter Wolf, M. Hauschild, P. Gagnon, C. Stegmann, N. I. Geddes, Michael Schulz, G. D. Lafferty, P. Routenburg, V. Gibson, R. Ströhmer, C. Markus, P. Mättig, Shoji Asai, G. T. Zorn, A. Astbury, U. Müller, S. Wotton, B. Poli, H. M. Bosch, R. Kowalewski, A. J. Martin, Wolfram Dietrich Zeuner, H. Fukui, A. Yeaman, P. D. Grannis, Gideon Alexander, J. M. Roney, R. G. Kellogg, Paolo Capiluppi, D. R. Ward, G. A. Snow, C. K. Hargrove, C. P. Ward, D. L. Rees, D. S. Koetke, J. C. Clayton, Stefano Marcellini, T. W. Pritchard, James Letts, Madjid Boutemeur, P. S. Wells, Guenter Duckeck, Terry Richard Wyatt, P. G. Estabrooks, R. K. Keeler, M. Coupland, P. M. Watkins, R. Howard, Claude Leroy, J. P. Pansart, V. H. Winterer, P. Szymanski, C. Jui, Stan Bentvelsen, C. Sbarra, Michael Dittmar, G. Yekutieli, A. A. Carter, Ron Folman, Roger Jones, M. G. Rison, T. J. McMahon, J. Schwiening, R. K. Carnegie, J. A. Wilson, J. von Krogh, J. Hart, Dave Robinson, J. D. Gillies, R. J. Barlow, D. J. Miller, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, N. K. Watson, Manuella Vincter, Alessandro Montanari, R. Mir, J. Lauber, H. Takeda, F. G. Oakham, W. Mohr, A. Posthaus, P. A. Elcombe, J. Becker, F. Scharf, A. D. Schaile, A. Skillman, E. K. U. Gross, A. Gaidot, T. Wlodek, M. Sproston, and N. Tesch
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, High Energy Physics::Experiment, Particle Physics - Experiment, Charged particle, Lepton
Abstract: We present an update of our measurement of the τ lepton lifetime, using data taken during 1992 and 1993 with the OPAL detector at LEP. The lifetime is determined from analyses of the impact parameters of tracks from τ decays to a single charged particle, and the reconstructed decay lenghts from the τ decays to three charged particles. With the added statistics (which increase the τ pair event sample size by more than a factor of four over our 1990 and 1991 data sample), the updated lifetime measurement is: ττ = 288.8 ± 2.2 (stat) ± 1.4 (sys) fs. When combined with world-average measurements of the tau leptonic branching fractions (assuming e-μ universality), the ratio of charged-current couplings is: ( g τ g μ ) = 1.005 ± 0.007 , in agreement with the hypothesis of τ-μ charged-current universality.
Published: 1994

12. Measurement of $$\Gamma (Z^0 \to b\bar b)/\Gamma (Z^0 \to hadrons)$$ using impact parameters and leptons

Author: R. Lahmann, D. C. Imrie, J. C. Clayton, B. C. Shen, G. P. Siroli, J. King, A. K. Honma, Christoph Schwick, W. G. Scott, Gideon Bella, H. J. Burckhart, M. Jones, Jacqueline Batley, G. A. Snow, C. P. Ward, M. J. Pearce, Horst Breuker, Margret Fincke-Keeler, D. L. Rees, M. J. Losty, Otmar Biebel, P. Igo-Kemenes, C. Jui, J. Hart, C. Sbarra, S. Barnett, Claude Leroy, A. Astbury, J. P. Pansart, J. D. Gillies, P. Pfister, R. Bartoldus, H. Jeremie, U. Müller, James Pinfold, G. E. Richards, D. Pitman, A. J. Martin, F. C. Grant, M. H. Lehto, D. G. Charlton, D. L. Wagner, R. J. Barlow, R. E. Hughes-Jones, U. Maur, D. Hochman, D. G. Fong, H. O. Ogren, Michael Dittmar, G. Yekutieli, D. J. Miller, Christoph Geich-Gimbel, G. Beaudoin, C. K. Hargrove, N. I. Geddes, Matthias Schröder, H. Lafoux, N. Paz-Jaoshvili, J. Steuerer, J. Gascon, H. von der Schmitt, T. G. Shears, B. Boden, K. Stephens, J. R. McNutt, R.J. Akers, J. Lauber, E. do Couto e Silva, A. Buijs, D. M. Strom, C. Stegmann, H. Takeda, D. M. Gingrich, D. E. Plane, P. Bentkowski, A. A. Carter, Roger Jones, R. Van Kooten, M. G. Rison, T. J. McMahon, B. Poli, F. G. Oakham, G. M. Dallavalle, M. Hansroul, Madjid Boutemeur, E. Lefebvre, J. W. Gary, Marcello Mannelli, J. E. Duboscq, H. Deng, R. Humbert, Shlomo Dado, Tohru Takeshita, J. Schwiening, R. K. Carnegie, F. X. Gentit, B. Fabbro, O. Schaile, P. Berlich, J. A. Wilson, F. Odorici, J. E. Conboy, B. Panzer-Steindel, R. Kowalewski, R. Yaari, D. J.P. Dumas, R. J. Hemingway, Georges Azuelos, P. G. Estabrooks, R. K. Keeler, P. M. Watkins, V. Gibson, S. Bethke, P. Scharff-Hansen, G. Quast, J. M. Lorah, W. Schappert, P. Kroll, Marco Cuffiani, John Baines, X. C. Lou, Silvia Arcelli, W. R. Gibson, A. M. Rossi, C. H. Shepherd-Themistocleous, P. Jovanovic, T. Tsukamoto, W. Mohr, J. F. Kral, Austin Ball, H. M. Fischer, M. A. Whallev, K. W. Bell, Max Weber, D. Menszner, Randall Sobie, G. D. Lafferty, S. L. Chu, A. Beck, J. C. Hill, A. Michelini, H. Mes, Norbert Wermes, J. von Krogh, I. P. Duerdoth, A. C. Janissen, J. M. Roney, E. Heflin, Sherry Towers, P. S. Wells, Misao Sasaki, R. J. Homer, M. Hauschild, Alessandro Montanari, R. M. Brown, T. Kawamoto, A. M. Smith, P. M. Hattersley, J. Banks, Lorne Levinson, G. Vasseur, Dave Robinson, Gideon Alexander, P. A. Elcombe, Giora Mikenberg, C. Markus, P. Paschievici, Terry Richard Wyatt, B. Lorazo, D. R. Ward, L. A. del Pozo, C. Y. Chang, M. F. Turner, B. W. Kennedy, T. W. Pritchard, E. Torrente-Lujan, G. Transtromer, Paolo Capiluppi, Kiyotomo Kawagoe, John Hobbs, C. Moisan, R. D. Heuer, M. Coupland, Andris Skuja, G. A. Beck, Fabrizio Fabbri, Achim Stahl, S. Orito, M. Rosvick, J. Becker, P. Teixeira-Dias, D. Van den plas, P. Weber, F. S. Merritt, F. Scharf, Tetsuro Mashimo, G. J. VanDalen, R. Mir, Gregor Herten, D. R. Rust, C. Wahl, B. Schmitt, B. Wilkens, A. Skillman, A. M. Lee, J. E. Pilcher, W. Gorn, A. Gaidot, T. Wlodek, M. Sproston, G. Giacomelli, J. A. McKenna, M. J. Oreglia, N. Tesch, A. Dieckmann, A. D. Schaile, V. H. Winterer, P. Schenk, J. R. Carter, P. F. Harrison, G. N. Patrick, Stephen Lloyd, M. Tecchio, M. S. Dixit, Ehud Duchovni, M. Jimack, H. Ihssen, Frans Meijers, S. W. Gensler, S. J. Hillier, T. Kobayashi, P. E.L. Clarke, H. Przysiezniak, M. Fierro, M. Yurko, S. A. Robins, J. P. Martin, P. W. Jeffreys, S. De Jong, P. Bright-Thomas, S. W. O'Neale, M. A. Thomson, K. J. Anderson, J. G. Layter, T. Hilse, O. Runolfsson, P. Poffenberger, C. Beeston, Claudio Grandi, D. A. Hinshaw, T. Behnke, D. Axen, A. Jawahery, Peter Sherwood, I. J. Bloodworth, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, K. Runge, P. Bock, G. Duckeck, R. Ströhmer, G. T. Zorn, H. M. Bosch, Wolfram Dietrich Zeuner, A. Yeaman, M. Settles, M. Foucher, N. K. Watson, G. W. Wilson, D. Karlen, C. Burgard, C. M. Hawkes, M. Cooper, Erez Etzion, Daniel Lellouch, Takehiko Mori, Stefan Kluth, Shlomit Tarem, S. Rossberg, C. J. Oram, R. P. Middleton, J. Goldberg, B. Nellen, P. Leblanc, M. Morii, T. J. Smith, Peter R Hobson, H. G. Evans, M. J. Goodrick, I. Cohen, P. Routenburg, Gunter Wolf, P. Mättig, Sachio Komamiya, N. J. Tesilian, E. Ros, A. T. Watson, S. Wotton, T. P. Kokott, A. Luig, Paul Kyberd, F. K. Loebinger, A. Rollnik, R. Giacomelli, J. Mildenberger, Harold Nguyen, Gordon H. Hanson, M. W. Redmond, John Allison, R. G. Kellogg, D. S. Koetke, Stefano Marcellini, and James Letts
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Elementary particle, Bottom quark, Charm quark, Nuclear physics, High Energy Physics::Experiment, Production (computer science), Impact parameter, Engineering (miscellaneous), Particle Physics - Experiment, Bar (unit)
Abstract: A measurement of$\Gamma _{b\bar b} /\Gamma _{had} \equiv \Gamma (Z^0 \to b\bar b)/\Gamma (Z^0 \to hadrons)$ is presented using a “mixed tag” method involving the identification of$Z^0 \to b\bar b$ events by two different techniques. The first uses the large impact parameter of tracks emerging from the decay ofb-flavoured hadrons and the second their semi-leptonic decay. The identification efficiencies are measured from the data using all possible combinations of the two tags in opposite hemispheres. The method is therefore insensitive to Monte Carlo modelling of bottom quark production and ofb-flavoured hadron production and decay properties, and depends only weakly on the simulation of the detector. The data sample collected by OPAL at LEP in 1990 and 1991 is considered. The result is: $$\frac{{\Gamma _{b\bar b} }}{{\Gamma _{had} }} = 0.218 \pm 0.006(stat) \pm 0.007(syst) \pm 0.007(\Gamma _{c\bar c} /\Gamma _{had} ),$$ where the systematic uncertainty due to the charm quark partial width has been separated from the other systematic uncertainties. Combination with previous OPAL measurements gives: $$\frac{{\Gamma _{b\bar b} }}{{\Gamma _{had} }} = 0.220 \pm 0.004(stat) \pm 0.006(syst) \pm 0.006(\Gamma _{c\bar c} /\Gamma _{had} ),$$
Published: 1994

13. Measurement of the time dependence of ↔ mixing using leptons and D∗± mesons

Author: Raimund Ströhmer, Madjid Boutemeur, Daniel Lellouch, P. Schütz, P. G. Estabrooks, R. K. Keeler, Takehiko Mori, M. Hauschild, S. A. Wotton, D. C. Imrie, B. Nijjhar, M. J. Pearce, Sachio Komamiya, Theodoros Geralis, T. Hilse, C. Markus, M. Sasaki, P. Paschievici, P. M. Watkins, J. C. Clayton, Margret Fincke-Keeler, U. Morii, T. P. Kokott, R. Bartoldus, J. W. Gary, H. O. Ogren, Christoph Geich-Gimbel, C. Y. Chang, Carla Sbarra, A. Luig, S. L. Lloyd, F. X. Gentit, J. E. Conboy, A. Fürtjes, M. Tecchio, F. S. Merritt, G. P. Siroli, J. King, P R Poffenberger, Claudio Grandi, Christoph Schwick, J. A. McKenna, Matthias Schröder, S. L. Chu, Gideon Bella, I. J. Bloodworth, James Pinfold, Michael Schulz, G. Duckeck, U. C. Dunwoody, Doug Gingrich, P.G. Bright-Thomas, A. H. Ball, Silvia Arcelli, A. Stahl, H. Lafoux, H. Mes, D. A. Hinshaw, J.A. Lauber, H. J. Burckhart, Jacqueline Batley, Z. Li, R.J. Akers, S. J. De Jong, Kiyotomo Kawagoe, D. G. Fong, T. W. Pritchard, M. Settles, J. von Krogh, P. Igo-Kemenes, M. F. Turner-Watson, A. P. Wagner, M. Coupland, Peter R Hobson, M. Foucher, P. Pfister, H. Jeremie, J. Schwiening, P.A. Hart, J. Gascon, J.P. Martin, T. R. Wyatt, R. E. Hughes-Jones, U. Maur, A. Astbury, A. Buijs, D. M. Strom, C. Stegmann, H. Przysiezniak, D. Hochman, H. von der Schmitt, R. J. Barlow, R. Kowalewski, U. Müller, V. Gibson, A. D. Schaile, E. do Couto e Silva, S. G. Clowes, G. W. Wilson, A. J. Martin, Erez Etzion, F. K. Loebinger, David Robinson, Stefan Kluth, M. Fierro, V. H. Winterer, S. W. O'Neale, Shlomit Tarem, J. Steuerer, H. Fukui, M. Yurko, P. W. Jeffreys, G. G. Hanson, P. Gagnon, T. J. Smith, K. Stephens, J. R. McNutt, S. Rossberg, A. Yeaman, T. Kobayashi, G. D. Lafferty, Shlomo Dado, C. J. Oram, P. D. Grannis, A. M. Lee, J. Allison, G. Giacomelli, Carsten Daniel Burgard, R. W. L. Jones, J. M. Roney, R. P. Middleton, Robert Lahmann, Gregor Herten, C. K. Hargrove, B. Poli, T. J. McMahon, A. I. McNab, M. W. Redmond, John Hart, P. Schenk, C. Wahl, B. Wilkens, K. J. Anderson, J. Goldberg, P. Le Du, B. Fabbro, T. Behnke, B. Nellen, G. T. Zorn, C. Darling, P. Kyberd, R. Yaari, Peter Sherwood, C. Jui, M. S. Dixit, Frans Meijers, R. Giacomelli, Marcello Mannelli, J. E. Duboscq, C. Moisan, Norbert Wermes, X. C. Lou, P. Leblanc, R. K. Carnegie, Gideon Alexander, H. M. Bosch, Marco Cuffiani, G. A. Beck, M. J. Kobel, Wolfram Dietrich Zeuner, Paolo Capiluppi, J. J. Ward, M. A. Thomson, Pedro Teixeira-Dias, J. E. Pilcher, P. Mättig, H. G. Evans, Shoji Asai, N. K. Watson, P. M. Hattersley, M. J. Goodrick, I. Cohen, J. G. Layter, J. A. Wilson, D. R. Ward, P. Scharff-Hansen, C. Charlesworth, P. E. L. Clarke, W. Mohr, M. Jimack, D. Axen, A. Jawahery, A. M. Rossi, A. Posthaus, T. Tsukamoto, Ehud Duchovni, A. M. Smith, H. M. Fischer, B. Schmitt, R. W. Springer, A. Michelini, Michael Dittmar, J. Hagemann, J. Ludwig, R. G. Kellogg, H-C. Schultz-Coulon, G. Vasseur, H. Ihssen, G. Yekutieli, B. Lorazo, D. S. Koetke, K. Runge, P. Bock, Stefano Marcellini, Andris Skuja, A. Skillman, S. A. Robins, J. K. Becker, G. A. Snow, S. W. Gensler, C. P. Ward, D. L. Rees, A. A. Carter, Ron Folman, James Letts, S. J. Hillier, G. D. Long, Tetsuro Mashimo, M. G. Rison, J. R. Carter, A. Gaidot, T. Wlodek, J. Mildenberger, M. Sproston, Paolo Giacomelli, M. Hansroul, W. Gorn, N. I. Geddes, P. S. Wells, M. Jones, A. T. Watson, P. Routenburg, N. Tesch, C. H. Shepherd-Themistocleous, R. J. Homer, P. A. Elcombe, R. J. Sobie, F. Scharf, R. Howard, Claude Leroy, Georges Azuelos, J. P. Pansart, C. M. Hawkes, K. W. Bell, J. C. Hill, B. C. Shen, Siegfried Bethke, W. G. Scott, P. Weber, Otmar Biebel, M. J. Losty, D. G. Charlton, H. Deng, R. Humbert, Sherry Towers, T. Kawamoto, E. Lefebvre, S. Orito, M. Rosvick, R. Van Kooten, F. Odorici, D. Pitman, M. J. Oreglia, M. H. Lehto, G. N. Patrick, C.J. Beeston, T. G. Shears, I. P. Duerdoth, Gy. Wolf, P. Berlich, D. Karlen, M. Fanti, O. Schaile, D. E. Plane, Fabrizio Fabbri, P. Bentkowski, D. Van den plas, G. M. Dallavalle, O. Runolfsson, D. R. Rust, Eduardo Ros, W. R. Gibson, A. Beck, E. Heflin, R. M. Brown, Lorne Levinson, P. D. Phillips, B. W. Kennedy, Gilles Beaudoin, R. J. Hemingway, D.L. Wagner, P. Jovanovic, Manuella Vincter, Alessandro Montanari, C. Dallapiccola, G. Mikenberg, J. D. Gillies, A. K. Honma, D. J. Miller, R. Mir, H. Takeda, R. D. Heuer, and F. G. Oakham
Subjects: Systematic error, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Oscillation, Electron–positron annihilation, Measure (mathematics), Mixing (physics), Lepton
Abstract: Data collected with the OPAL detector at LEP during 1990–1993 are used to measure the time dependence of B d 0 ↔ B d 0 mixing. From a sample of 153 ± 12 events with a charged D∗ and a lepton in the opposite hemisphere, we measure the B d 0 ↔ B d 0 oscillation frequency to be Δmd = 0.57±0.11(stat.)±0.02(syst.) ps−1. This corresponds to an oscillation parameter of xd = ΔmdτBd0 = 0.82±0.16(stat.) ± 0.03(syst.) ± 0.09(syst. τB0d), where the second systematic uncertainty is due to the error in the measured Bd0 lifetime.
Published: 1994

14. A study of mean sub-jet multiplicities in two- and three-jet hadronicZ 0 decays

Author: U. Müller, A. J. Martin, B. C. Shen, Siegfried Bethke, A. K. Honma, W. G. Scott, J. W. Gary, P. E.L. Clarke, M. K. Jones, P. Scharff-Hansen, C. K. Hargrove, Gideon Bella, T. J. McMahon, J. P. Martin, H. J. Burckhart, Jacqueline Batley, S. De Jong, M. J. Losty, Shlomo Dado, J. Schwiening, R. K. Carnegie, H. M. Fischer, M. Yurko, J. A. Wilson, Sachio Komamiya, A. Michelini, P. W. Jeffreys, T. Kobayashi, H. Mes, Theodoros Geralis, E. Ros, I. P. Duerdoth, A. M. Smith, Otmar Biebel, G. E. Richards, D. G. Charlton, D. L. Wagner, Matthias Schröder, G. Vasseur, B. Lorazo, Xinchou Lou, I. J. Bloodworth, P. Bright-Thomas, S. A. Robins, R. Bartoldus, P. A. Hart, H. Deng, T. P. Kokott, G. Mikenberg, C. Sbarra, R. Humbert, A. Luig, Madjid Boutemeur, M. J. Pearce, C. Moisan, J. Steuerer, G. A. Beck, James Pinfold, R. Kowalewski, H. O. Ogren, Christoph Geich-Gimbel, Michael Dittmar, J. G. Layter, J. J. Ward, M. A. Thomson, R. J. Hemingway, G. Yekutieli, Achim Stahl, J. R. Carter, P. Teixeira-Dias, D. G. Fong, J. Gascon, H. von der Schmitt, Norbert Wermes, Sherry Towers, C. Charlesworth, A. A. Carter, Ron Folman, J. Goldberg, P. G. Estabrooks, M. Settles, R. K. Keeler, P. Igo-Kemenes, T. Kawamoto, P. Jovanovic, B. Nellen, Marcello Mannelli, J. E. Duboscq, R. W.L. Jones, B. Schmitt, Georges Azuelos, Gideon Alexander, T. Behnke, Andris Skuja, Hans-Christian Schultz-Coulon, Austin Ball, J. Kroll, Michael Schulz, Z. Li, Paolo Capiluppi, E. Lefebvre, S. L. Lloyd, H. Jeremie, G. A. Snow, C. P. Ward, S. Orito, M. Rosvick, D. L. Rees, M. G. Rison, P. Leblanc, R. E. Hughes-Jones, U. Maur, F. X. Gentit, G. D. Long, P. Schütz, Margret Fincke-Keeler, Tetsuro Mashimo, J. E. Conboy, A. Fürtjes, R. Mir, Manuella Vincter, Alessandro Montanari, K. W. Bell, R. Yaari, Marco Cuffiani, F. Odorici, G. G. Hanson, M. Morii, Peter R Hobson, T. Hilse, V. Gibson, M. Sasaki, J. C. Hill, T. W. Pritchard, B. Boden, J. Allison, R. Ströhmer, B. Poli, M. J. Oreglia, G. Giacomelli, P. Routenburg, W. Gorn, P. F. Harrison, E. do Couto e Silva, M. Tecchio, F. S. Merritt, J. A. McKenna, D. E. Plane, P. Pfister, J. Hart, C. Dallapiccola, M. Foucher, Guenter Duckeck, S. L. Chu, R. G. Kellogg, A. D. Schaile, P. Schenk, J. D. Gillies, Silvia Arcelli, O. Runolfsson, C. Y. Chang, M. F. Turner, S. Barnett, D. S. Koetke, G. T. Zorn, Stefano Marcellini, H. G. Evans, M. S. Dixit, J. von Krogh, Frans Meijers, G. W. Wilson, M. J. Goodrick, D. Karlen, Ehud Duchovni, G. N. Patrick, Michael Kobel, P. Le Du, B. Fabbro, H. M. Bosch, P. Bentkowski, D. J. Miller, Wolfram Dietrich Zeuner, I. Cohen, M. Jimack, James Letts, C. Burgard, H. Ihssen, C. Beeston, S. W. Gensler, D. Hochman, S. J. Hillier, H. Lafoux, Paolo Giacomelli, M. Hansroul, C. M. Hawkes, Claudio Grandi, M. Cooper, C. Jui, Daniel Lellouch, D. Axen, G. M. Dallavalle, J. Lauber, C. H. Shepherd-Themistocleous, Takehiko Mori, S. W. O'Neale, L. A. del Pozo, A. Jawahery, R. J. Homer, P. M. Watkins, Paul Kyberd, H. Takeda, F. G. Oakham, Peter Sherwood, Erez Etzion, F. K. Loebinger, J. C. Clayton, K. J. Anderson, A. M. Rossi, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, T. Tsukamoto, G. J. Van Dalen, K. Runge, P. Bock, V. H. Winterer, G. D. Lafferty, David Robinson, A. Yeaman, Stefan Kluth, C. Darling, Shlomit Tarem, P. Mättig, Shoji Asai, D. A. Hinshaw, R. J. Barlow, H. Przysiezniak, M. Fierro, A. Rollnik, P. Poffenberger, S. Rossberg, C. J. Oram, R. Giacomelli, T. J. Smith, K. Stephens, J. R. McNutt, R. P. Middleton, D. J.P. Dumas, G. Quast, Gunter Wolf, J. Mildenberger, Harold Nguyen, D. R. Ward, N. I. Geddes, W. R. Gibson, M. W. Redmond, M. Hauschild, S. Wotton, C. Markus, P. Paschievici, A. Beck, E. Heflin, R. M. Brown, Lorne Levinson, B. W. Kennedy, Gilles Beaudoin, E. Torrente-Lujan, Gregor Herten, C. Wahl, B. Wilkens, Kiyotomo Kawagoe, P. Weber, J. E. Pilcher, R. Lahmann, D. C. Imrie, R.J. Akers, G. P. Siroli, J. King, Christoph Schwick, A. Skillman, P. M. Hattersley, A. Gaidot, T. Wlodek, M. Sproston, F. C. Grant, N. Tesch, N. K. Watson, A. Buijs, D. M. Strom, C. Stegmann, J. M. Roney, H. Fukui, W. Mohr, P. A. Elcombe, R. J. Sobie, J. Becker, R. Howard, F. Scharf, Claude Leroy, J. P. Pansart, P. S. Wells, Terry Richard Wyatt, A. T. Watson, M. Coupland, R. Van Kooten, D. Pitman, M. H. Lehto, T. G. Shears, D. M. Gingrich, P. Berlich, D. R. Rust, A. M. Lee, O. Schaile, N. J. Tresilian, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, and A. Astbury
Subjects: Quantum chromodynamics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Monte Carlo method, Hadron, Perturbative QCD, Multiplicity (mathematics), Gluon, Nuclear physics, High Energy Physics::Experiment, Parton shower, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: This paper describes an analysis of sub-jet multiplicities, which are expected to be sensitive to the properties of soft gluon radiation, in hadronic decays of theZ0. Two- and three-jet event samples are selected using thek⊥ jet clustering algorithm at a jet resolution scaley1. The mean sub-jet multiplicity as a function of the sub-jet resolution,y0, is determined separately for both event samples by reapplying the same jet algorithm at resolution scalesy0
Published: 1994

15. Measurement of the photon structure functionF 2 ? in the reactione + e ??e + e ?+hadrons at LEP

Author: James Pinfold, D. G. Fong, J. Gascon, H. von der Schmitt, Otmar Biebel, G. E. Richards, D. G. Charlton, D. L. Wagner, Matthias Schröder, Marcello Mannelli, J. E. Duboscq, R. W.L. Jones, Andris Skuja, Tetsuro Mashimo, W. Gorn, H. Deng, R. Humbert, M. Yurko, P. Scharff-Hansen, A. M. Smith, G. Vasseur, B. Lorazo, Kiyotomo Kawagoe, J. Steuerer, Erez Etzion, H. Lafoux, N. Paz-Jaoshvili, Norbert Wermes, Sherry Towers, Silvia Arcelli, I. J. Bloodworth, M. Settles, S. A. Robins, P. W. Jeffreys, T. Kobayashi, Gideon Bella, Stefan Kluth, P. Igo-Kemenes, M. Foucher, H. J. Burckhart, P. Bright-Thomas, T. Kawamoto, C. Y. Chang, M. F. Turner, Gregor Herten, C. Wahl, B. Wilkens, D. A. Hinshaw, Jacqueline Batley, Tohru Takeshita, J. G. Layter, G. W. Wilson, D. Karlen, C. Burgard, H. Jeremie, O. Schaile, Shlomit Tarem, J. J. Ward, G. J. VanDalen, J. C. Clayton, M. A. Thomson, M. Hansroul, P. Weber, S. Rossberg, C. J. Oram, R. E. Hughes-Jones, U. Maur, J. Mildenberger, Harold Nguyen, Georges Azuelos, J. E. Pilcher, Shlomo Dado, T. Behnke, V. Gibson, J. F. Kral, K. W. Bell, N. I. Geddes, C. H. Shepherd-Themistocleous, R. P. Middleton, M. J. Pearce, Horst Breuker, Max Weber, M. W. Redmond, J. C. Hill, R. J. Homer, X. C. Lou, R. J. Barlow, R. Yaari, P. E.L. Clarke, M. Hauschild, B. C. Shen, P. S. Wells, E. do Couto e Silva, T. W. Pritchard, J. Goldberg, H. Przysiezniak, M. Fierro, J. Banks, S. Bethke, A. K. Honma, W. G. Scott, W. R. Gibson, E. Lefebvre, Marco Cuffiani, J. P. Martin, C. Moisan, B. Nellen, J. W. Gary, F. Odorici, N. J. Tresilian, Terry Richard Wyatt, G. A. Beck, A. T. Watson, P. Mättig, C. Markus, R. G. Kellogg, A. Astbury, Achim Stahl, P. Paschievici, P. Leblanc, S. De Jong, P. Teixeira-Dias, D. S. Koetke, R. D. Heuer, Stefano Marcellini, U. Müller, C. M. Hawkes, M. Coupland, M. Cooper, J. A. McKenna, M. J. Losty, James Letts, Fabrizio Fabbri, D. Van den plas, B. Fabbro, A. J. Martin, Daniel Lellouch, S. L. Chu, T. Hilse, B. Panzer-Steindel, H. Mes, Paul Kyberd, F. K. Loebinger, Takehiko Mori, A. Beck, H. G. Evans, I. P. Duerdoth, J. Allison, D. Pitman, M. J. Goodrick, G. D. Lafferty, P. F. Harrison, I. Cohen, M. H. Lehto, G. Duckeck, R. Ströhmer, B. Schmitt, E. Heflin, C. Jui, O. Runolfsson, M. Jones, A. Rollnik, P. Poffenberger, R. Giacomelli, C. K. Hargrove, G. Mikenberg, Madjid Boutemeur, Gunter Wolf, R. M. Brown, G. A. Snow, C. P. Ward, P. M. Hattersley, T. G. Shears, T. J. Smith, R. J. Sobie, D. L. Rees, Lorne Levinson, P. G. Estabrooks, R. K. Keeler, K. Stephens, D. M. Gingrich, A. M. Rossi, C. Beeston, Margret Fincke-Keeler, R.J. Akers, Claudio Grandi, J. R. McNutt, John Hobbs, B. W. Kennedy, Gilles Beaudoin, M. Tecchio, S. Wotton, E. Torrente-Lujan, P. Berlich, G. T. Zorn, P. M. Watkins, V. H. Winterer, Claude Leroy, J. P. Pansart, T. Tsukamoto, R. Lahmann, D. R. Rust, F. C. Grant, D. C. Imrie, Ehud Duchovni, M. A. Whalley, D. E. Plane, M. Sasaki, P. Bentkowski, G. M. Dallavalle, A. M. Lee, M. Jimack, A. Buijs, G. Quast, John Baines, D. M. Strom, C. Stegmann, H. Ihssen, D. J.P. Dumas, P. Pfister, S. W. Gensler, S. J. Hillier, B. Boden, H. M. Bosch, Wolfram Dietrich Zeuner, B. Poli, D. R. Ward, G. Transtromer, G. P. Siroli, J. King, H. M. Fischer, A. Michelini, R. Kowalewski, A. C. Janissen, S. W. O'Neale, S. Barnett, Christoph Schwick, Gideon Alexander, D. Hochman, Paolo Capiluppi, J. R. Carter, D. Axen, K. J. Anderson, A. Jawahery, Peter Sherwood, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, K. Runge, P. Bock, S. Orito, M. Rosvick, M. Morii, Peter R Hobson, R. Mir, P. Routenburg, M. J. Oreglia, F. S. Merritt, J. von Krogh, Dave Robinson, G. N. Patrick, L. A. del Pozo, C. Sbarra, R. Bartoldus, Michael Dittmar, G. Yekutieli, H. O. Ogren, A. Yeaman, Christoph Geich-Gimbel, A. A. Carter, J. Kroll, R. Van Kooten, S. L. Lloyd, N. K. Watson, F. X. Gentit, J. E. Conboy, Sachio Komamiya, M. G. Rison, T. J. McMahon, J. Schwiening, E. Ros, R. K. Carnegie, J. A. Wilson, T. P. Kokott, A. Luig, W. Schappert, J. M. Roney, J. M. Lorah, J. Lauber, W. Mohr, H. Takeda, F. G. Oakham, R. J. Hemingway, P. Jovanovic, Austin Ball, D. Menszner, Alessandro Montanari, J. Hart, J. D. Gillies, D. J. Miller, P. A. Elcombe, J. Becker, F. Scharf, A. Skillman, A. Gaidot, T. Wlodek, M. Sproston, N. Tesch, A. Dieckmann, G. G. Hanson, G. Giacomelli, A. D. Schaile, P. Schenk, M. S. Dixit, and Frans Meijers
Subjects: Quantum chromodynamics, Quark, Physics, Particle physics, Photon, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Hadron, Perturbative QCD, Vector meson dominance, Elementary particle, Photon structure function, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous)
Abstract: We present measurements of the hadronic photon structure functionF2γ(x), in twoQ2 ranges with mean values of 5.9 GeV2 and 14.7 GeV2. The data were taken by the OPAL experiment at LEP, with$\sqrt s$ close to theZ0 mass and correspond to an integratede+e− luminosity of 44.8 pb−1. In the context of a QCD-based model we find the quark transverse momentum cutoff separating the vector meson dominance (VMD) and perturbative QCD regions to be 0.27±0.10 GeV. We confirm that there is a significant pointlike component of the photon when the probe photon hasQ2>4 GeV2. Our measurements extend to lower values ofx than any previous experiment, and no increase ofF2γ(x) is observed.
Published: 1994

16. Measurement of the time dependence of mixing using a jet charge technique

Author: W. R. Gibson, A. Beck, E. Heflin, P. S. Wells, R. M. Brown, Lorne Levinson, C. Y. Chang, M. F. Turner, James Pinfold, Terry Richard Wyatt, G. Beaudoin, D. G. Fong, R. Bartoldus, B. W. Kennedy, E. Torrente-Lujan, J. Gascon, H. von der Schmitt, N. K. Watson, Michael Kobel, Gregor Herten, M. Coupland, John Allison, Shlomo Dado, R. G. Kellogg, D. S. Koetke, Stefano Marcellini, James Letts, H. O. Ogren, C. Wahl, C. Sbarra, B. Wilkens, Christoph Geich-Gimbel, H. Lafoux, Paul Kyberd, Paolo Giacomelli, F. K. Loebinger, Otmar Biebel, M. Hansroul, N. J. Tresilian, A. Rollnik, R. Giacomelli, Michael Dittmar, R. J. Hemingway, J. W. Gary, G. E. Richards, Georges Azuelos, D. G. Charlton, D. L. Wagner, T. J. Smith, K. Stephens, G. Yekutieli, J. Kroll, R. D. Heuer, Marcello Mannelli, J. E. Duboscq, Fabrizio Fabbri, D. Van den plas, J. E. Pilcher, F. C. Grant, K. W. Bell, W. Mohr, J. Mildenberger, Giora Mikenberg, Harold Nguyen, F. X. Gentit, J. E. Conboy, A. Fürtjes, R. Van Kooten, D. Pitman, P. Jovanovic, M. W. Redmond, J. R. McNutt, A. A. Carter, Ron Folman, Roger Jones, H. Deng, R. Humbert, Kiyotomo Kawagoe, M. H. Lehto, T. G. Shears, P. Poffenberger, Gideon Bella, H. J. Burckhart, Jacqueline Batley, J. C. Hill, Misao Sasaki, H. Przysiezniak, Austin Ball, M. Fierro, G. G. Hanson, A. Buijs, D. M. Strom, C. Stegmann, S. L. Chu, I. J. Bloodworth, P. Scharff-Hansen, D. M. Gingrich, P. A. Elcombe, B. C. Shen, D. A. Hinshaw, C. H. Shepherd-Themistocleous, Manuella Vincter, Alessandro Montanari, P. Schütz, M. G. Rison, E. Lefebvre, R. J. Homer, D. E. Plane, H. Fukui, T. Hilse, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, Siegfried Bethke, G. Giacomelli, J. Hart, F. S. Merritt, P. Berlich, M. Hauschild, A. K. Honma, A. M. Smith, F. Odorici, C. Dallapiccola, W. G. Scott, O. Runolfsson, P. Bentkowski, Sherry Towers, T. Kawamoto, T. J. McMahon, T. W. Pritchard, J. D. Gillies, G. M. Dallavalle, G. A. Snow, C. P. Ward, J. Becker, A. D. Schaile, G. Vasseur, B. Lorazo, C. Markus, D. R. Rust, P. Paschievici, V. Gibson, D. L. Rees, Xinchou Lou, Z. Li, J. Schwiening, G. Quast, C. Beeston, R. K. Carnegie, F. Scharf, P. Schenk, P. Weber, Claudio Grandi, M. Settles, C. Moisan, J. A. McKenna, G. J. VanDalen, G. A. Beck, P. F. Harrison, Andris Skuja, Achim Stahl, T. Behnke, M. Yurko, Guenter Duckeck, P. W. Jeffreys, M. J. Losty, J. A. Wilson, R. J. Barlow, S. Orito, M. Rosvick, D. J.P. Dumas, D. J. Miller, A. M. Lee, P. Teixeira-Dias, Stephen Lloyd, G. D. Long, M. S. Dixit, R. Mir, Tetsuro Mashimo, Frans Meijers, P. Bright-Thomas, A. Skillman, R.J. Akers, J. J. Ward, M. Tecchio, M. A. Thomson, A. Gaidot, D. R. Ward, P. Le Du, B. Fabbro, H. Mes, I. P. Duerdoth, T. Wlodek, M. Sproston, B. Schmitt, M. Morii, M. Foucher, D. Axen, C. Jui, P. E.L. Clarke, A. Jawahery, O. Schaile, R. Howard, M. K. Jones, J. Lauber, S. W. O'Neale, Margret Fincke-Keeler, A. M. Rossi, Peter R Hobson, Claude Leroy, S. Barnett, N. Wermes, W. Gorn, J. P. Pansart, J. P. Martin, N. Tesch, K. J. Anderson, D. Hochman, H. Takeda, V. H. Winterer, M. J. Oreglia, Peter Sherwood, R. W. Springer, Alexander Wagner, F. G. Oakham, T. Tsukamoto, P. Pfister, J. Hagemann, J. Ludwig, K. Runge, P. Bock, J. C. Clayton, J. R. Carter, G. N. Patrick, S. De Jong, P. Routenburg, J. Goldberg, J. von Krogh, B. Nellen, P. M. Hattersley, P. Leblanc, J. Steuerer, R. Ströhmer, N. I. Geddes, H. G. Evans, Dave Robinson, M. J. Goodrick, I. Cohen, G. T. Zorn, R. Lahmann, Gunter Wolf, L. A. del Pozo, B. Boden, B. Poli, D. C. Imrie, G. W. Wilson, H. M. Bosch, Wolfram Dietrich Zeuner, S. Wotton, R. Yaari, Madjid Boutemeur, Marco Cuffiani, H. M. Fischer, J. G. Layter, G. P. Siroli, J. King, Christoph Schwick, P. G. Estabrooks, Erez Etzion, R. K. Keeler, A. Yeaman, A. Michelini, Stefan Kluth, Shlomit Tarem, D. Karlen, C. Charlesworth, S. Rossberg, C. J. Oram, C. Burgard, R. P. Middleton, S. A. Robins, P. M. Watkins, Sachio Komamiya, Theodoros Geralis, E. Ros, A. T. Watson, Silvia Arcelli, T. P. Kokott, A. Luig, J. M. Roney, C. Darling, P. A. Hart, P. Igo-Kemenes, H. Jeremie, R. E. Hughes-Jones, U. Maur, P. Mättig, Shoji Asai, E. do Couto e Silva, M. J. Pearce, C. M. Hawkes, M. Cooper, Daniel Lellouch, Takehiko Mori, Ehud Duchovni, M. Jimack, H. Ihssen, S. W. Gensler, S. J. Hillier, T. Kobayashi, Matthias Schröder, R. Kowalewski, Gideon Alexander, Paolo Capiluppi, A. Astbury, U. Müller, A. J. Martin, and C. K. Hargrove
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Jet (fluid), Particle decay, Particle physics, Meson, Oscillation, Electron–positron annihilation, High Energy Physics::Experiment, Charge (physics), Electric charge, Lepton
Abstract: The observation and measurement of the time-dependence of B0d↔B0d mixing are described. The B0d meson is reconstructed in final states that contain a D∗− and an l+, where the b flavour of the B0d at decay time is tagged by the electric charge of the lepton. A new and efficient method, using a jet charge technique, is developed for identifying the b flavour of the produced B0d. From a sample of 556 D∗±l∓ candidates reconstructed in the OPAL data collected during 1990–1993, the B0d↔B0d oscillation frequency is measured to be Δmd = 0.508 ± 0.075 (stat) ±0.025(syst) ps−1 giving an oscillation parameter of χd = 0.73 ± 0.11 (stat) ±0.08 (syst), where 0.076 of the systematic error on χd arises from the uncertainty on the B0d lifetime.
Published: 1994

17. 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

18. Multiplicity and transverse momentum correlations in multihadronic final states in e+e− interactions at √s = 91.2 GeV

Author: J. W. Gary, H. O. Ogren, Sachio Komamiya, Christoph Geich-Gimbel, Theodoros Geralis, Carla Sbarra, I. J. Bloodworth, G. Quast, T. P. Kokott, A. Luig, S. L. Lloyd, F. X. Gentit, T. R. Wyatt, M. Settles, J. E. Conboy, M. Tecchio, R. J. Barlow, G. Mikenberg, B. C. Shen, M. Foucher, S. L. Chu, J. D. Gillies, M. Jimack, Siegfried Bethke, M. Hauschild, W. G. Scott, P. Weber, C. Jui, Tohru Takeshita, Georges Azuelos, M. Fierro, C. M. Hawkes, K. W. Bell, Norbert Wermes, J. C. Hill, S. A. Wotton, A. H. Ball, Silvia Arcelli, G. W. Wilson, M. J. Losty, J. Pinfold, C. Schwick, C. Markus, M. Jones, P. Paschievici, J.A. Lauber, D. G. Fong, G. A. Snow, C. P. Ward, J. M. Roney, J. Gascon, J. Goldberg, A. Skillman, D. J. Miller, Kiyotomo Kawagoe, P. Igo-Kemenes, Paul Fraser Harrison, B. Boden, D. L. Rees, G. Duckeck, A. D. Schaile, P. S. Wells, J. Schwiening, B. Nellen, B. Poli, Z. Li, R. G. Kellogg, Daniel Lellouch, P. Leblanc, H. Jeremie, A. Gaidot, D. S. Koetke, F. S. Merritt, Takehiko Mori, A. T. Watson, R. E. Hughes-Jones, U. Maur, T. Hilse, V. H. Winterer, T. Wlodek, M. J. Cooper, M. Sproston, R.J. Akers, W. R. Gibson, V. Gibson, Marcello Mannelli, J. E. Duboscq, D. Axen, H. G. Evans, Stefano Marcellini, M. Morii, N. Tesch, A. Dieckmann, Peter R Hobson, James Letts, A. Jawahery, N. K. Watson, M. J. Goodrick, I. Cohen, J. A. McKenna, Andris Skuja, E. do Couto e Silva, R. J. Hemingway, Shlomo Dado, A. M. Lee, G. D. Lafferty, Tetsuro Mashimo, R. Kowalewski, Claudio Grandi, D. Pitman, D.L. Wagner, M. Yurko, A. Beck, Michael Schulz, P. Jovanovic, P. W. Jeffreys, J. M. Lorah, Madjid Boutemeur, C. Darling, X. C. Lou, E. Heflin, Matthias Schröder, T. Kobayashi, R. Yaari, P. E. L. Clarke, Robert Lahmann, R. W. Springer, W. Mohr, A. M. Rossi, Richard Keeler, R. M. Brown, P. Mättig, J. Mildenberger, Harold Nguyen, Marco Cuffiani, P. G. Estabrooks, C. J. Oram, T. W. Pritchard, W. Gorn, Gideon Alexander, Paolo Capiluppi, Gordon H. Hanson, Alessandro Montanari, T. Tsukamoto, D. C. Imrie, Lorne Levinson, H. von der Schmitt, A. Yeaman, N. I. Geddes, J. Ludwig, K. Runge, P. Bock, P. A. Elcombe, Erez Etzion, Ehud Duchovni, R. Mir, H. M. Fischer, B. W. Kennedy, P. M. Watkins, H. Lafoux, J. J. Ward, David Robinson, M. A. Thomson, Stefan Kluth, Shlomit Tarem, A. Michelini, A. Wagner, J. Hagemann, A. C. Janissen, H. Ihssen, M. Rosvick, P. Scharff-Hansen, F. K. Loebinger, A. Astbury, S. Rossberg, Gilles Beaudoin, E. Torrente-Lujan, N. Paz-Jaoshvili, Gregor Herten, S. A. Robins, S. W. Gensler, R. P. Middleton, F. Scharf, C. Wahl, M. W. Redmond, D. M. Gingrich, S. J. Hillier, H. Mes, G. P. Siroli, J. King, Peter Sherwood, D. A. Hinshaw, A. M. Smith, A. Rollnik, R. Giacomelli, B. Wilkens, J. R. Carter, G. Vasseur, B. Lorazo, Pedro Teixeira-Dias, J. Kroll, H. Takeda, M. Fincke-Keeler, R. D. Heuer, F. G. Oakham, J. Allison, P. Routenburg, G. T. Zorn, P. Kyberd, H. M. Bosch, J. E. Pilcher, Wolfram Dietrich Zeuner, P.A. Hart, Eduardo Ros, John Hart, U. Müller, R. Sobie, A. J. Martin, P. M. Hattersley, T. Behnke, C. K. Hargrove, D. E. Plane, P. Poffenberger, M. J. Pearce, P. Bentkowski, G. M. Dallavalle, O. Runolfsson, D. J.P. Dumas, T. J. McMahon, R. K. Carnegie, J. A. Wilson, W. Schappert, J. G. Layter, Michael Dittmar, G. Yekutieli, A. A. Carter, S. J. De Jong, M. G. Rison, M. F. Turner, S. Barnett, D. Hochman, J. von Krogh, K. Stephens, J. R. McNutt, L. A. del Pozo, G. Giacomelli, P. Schenk, M. S. Dixit, Frans Meijers, D. R. Ward, G. Transtromer, G. J. VanDalen, J. C. Clayton, M. Coupland, J.P. Martin, H. Przysiezniak, Otmar Biebel, G. E. Richards, D. G. Charlton, J. K. Becker, H. Deng, R. Humbert, Paolo Giacomelli, M. Hansroul, C. H. Shepherd-Themistocleous, R. J. Homer, C. Moisan, G. A. Beck, Sherry Towers, T. Kawamoto, B. Schmitt, H-C. Schultz-Coulon, A. Stahl, R. W. L. Jones, P. Pfister, S. Orito, P. Le Du, B. Fabbro, Gideon Bella, H. J. Burckhart, Jacqueline Batley, M. J. Oreglia, A. K. Honma, C. Y. Chang, G. N. Patrick, C. Burgard, J. Steuerer, S. W. O'Neale, K. J. Anderson, Raimund Ströhmer, T. J. Smith, P. Schütz, M. Sasaki, I. P. Duerdoth, E. Lefebvre, F. Odorici, R. Howard, Claude Leroy, D. R. Rust, J. P. Pansart, P.G. Bright-Thomas, F. C. Grant, M. A. Whalley, A. Buijs, D. M. Strom, C. Stegmann, R. Van Kooten, M. H. Lehto, C.J. Beeston, T. G. Shears, Gy. Wolf, P. Berlich, D. Karlen, O. Schaile, N. J. Tresilian, Fabrizio Fabbri, D. Van den plas, and R. Bartoldus
Subjects: Quark, Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Multiplicity (mathematics), Charged particle, Gluon, Nuclear physics, High Energy Physics::Experiment, Parton shower
Abstract: We report a study of forward-backward multiplicity correlations and a measurement of the dependence on charged multiplicity of the mean transverse momentum of charged hadrons, measured with respect to the thrust axis. The study was performed on a high statistics sample of Z(0) decays to multihadronic final states collected by the OPAL Collaboration at LEP. The positive forward-backward multiplicity correlation observed in our inclusive sample can be understood in terms of a superposition of distinct event topologies characterized by a different amount of hard gluon radiation (2-, 3- and 4-jet events) and with different mean multiplicities. The residual positive correlation that we see in a clean 2-jet sample can be interpreted in terms of fragmentation properties of different quark flavours and of the production and decay of resonances. We have compared the observed effects with the predictions of QCD-based parton shower models. The data are well described by the Jetset 7.3 Monte Carlo, while Herwig 5.5 does not satisfactorily reproduce the measured correlations. Hard gluon radiation is also shown to be responsible for the observed increase of about 40% in the mean transverse momentum of produced charged hadrons in the multiplicity range from 10 to 30. The comparison with the results obtained in an analysis of a sample enriched in Z(0) --> b $$($) over bar b events, shows that the presence of heavy flavours does not contribute significantly to the observed effect.
Published: 1994

19. Measurement of $$\Gamma ({\rm Z}^0 \to b\bar b)/\Gamma ({\rm Z}^0 \to hadrons)$$ using leptons

Author: M. Hauschild, P. Singh, Tohru Takeshita, C. Markus, J. Hart, P. Paschievici, R. W. L. Jones, J. D. Gillies, Georges Azuelos, B. Panzer-Steindel, J. F. Kral, Gideon Alexander, Horst Breuker, K. W. Bell, Max Weber, D. J. Miller, J. C. Hill, Paolo Capiluppi, D. Pitman, P. Igo-Kemenes, G. Maringer, M. Jobes, U. Binder, P. E.L. Clarke, J. Steuerer, C. Y. Chang, M. F. Turner, Gideon Bella, H. O. Ogren, Christoph Geich-Gimbel, A. Astbury, F. Lamarche, H. J. Burckhart, Jacqueline Batley, J. Kroll, H. Jeremie, O. Ganel, R. E. Hughes-Jones, U. Maur, P. Taras, P. Scharff-Hansen, A. J. Martin, R. J. Hemingway, M. H. Lehto, Mitsuaki Nozaki, W. J. Collins, Ehud Duchovni, R. Shypit, C. Moisan, J. P. Walker, G. A. Beck, P. Teixeira-Dias, S. L. Lloyd, F. X. Gentit, J. E. Conboy, Silvia Arcelli, A. M. Smith, A. Simon, Otmar Biebel, T. G. Shears, V. Gibson, P. Jovanovic, S. Barnett, H. Ihssen, T. Behnke, Austin Ball, R. Yaari, B. Schmitt, S. W. Gensler, A. Pouladdej, G. E. Richards, D. G. Charlton, D. L. Wagner, G. Vasseur, B. Lorazo, T. W. Pritchard, S. Bethke, D. Menszner, S. J. Hillier, E. do Couto e Silva, C. J. Virtue, Marco Cuffiani, Margret Fincke-Keeler, P. Pfister, Alessandro Montanari, D. Hochman, N. J. Thackray, C. K. Hargrove, T. J. Smith, K. Stephens, P. Berlich, H. Deng, R. Humbert, J. R. McNutt, L. Köpke, J. Goldberg, B. Nellen, James Pinfold, M. Jimack, C. Wahl, F. S. Merritt, S. L. Chu, M. Hansroul, D. G. Fong, J. Gascon, H. von der Schmitt, P. Leblanc, Michael Dittmar, G. Yekutieli, Norbert Wermes, J. E. Pilcher, A. D. Schaile, C. H. Shepherd-Themistocleous, R. J. Homer, D. R. Rust, B. C. Shen, P. A. Elcombe, N. Paz-Jaoshvili, T. Kawamoto, G. Quast, S. W. O'Neale, H. G. Evans, P. F. Harrison, M. J. Goodrick, I. Cohen, R. J. Sobie, S. Orito, R. G. Kellogg, John Baines, V. H. Winterer, G. D. Lafferty, John Hobbs, A. K. Honma, D. S. Koetke, W. G. Scott, M. Rosvick, R. Mir, Marcello Mannelli, J. E. Duboscq, P. D. Acton, Andris Skuja, M. Tecchio, Stefano Marcellini, W. R. Gibson, J. A. McKenna, James Letts, A. A. Carter, P. M. Hattersley, J. W. Gary, M. Yurko, R. Kowalewski, J. Becker, K. J. Anderson, D. R. Ward, G. Transtromer, Tetsuro Mashimo, P. G. Estabrooks, R. K. Keeler, B. Boden, Claude Leroy, J. P. Pansart, B. Poli, G. J. VanDalen, F. Odorici, R. F. McGowan, J. Mildenberger, Harold Nguyen, M. J. Oreglia, J. C. Clayton, P. M. Watkins, W. Gorn, R. Van Kooten, A. Beck, G. A. Bahan, P. W. Jeffreys, P. P. Allport, T. Mouthuy, O. Schaile, N. I. Geddes, C. Jui, F. G. Oakham, J. M. Roney, P. S. Wells, E. Heflin, S. Wotton, A. T. Watson, T. Kobayashi, A. M. Lee, J. Banks, N. J. Tresilian, G. N. Patrick, R. M. Brown, R. D. Heuer, M. Sasaki, J. M. Lorah, Lorne Levinson, M. Coupland, F. C. Grant, M. A. Whalley, Paul Kyberd, F. K. Loebinger, Fabrizio Fabbri, W. Mohr, D. Van den plas, Kiyotomo Kawagoe, H. Mes, A. M. Rossi, Shlomo Dado, Erez Etzion, A. Buijs, D. M. Strom, M. W. Redmond, I. P. Duerdoth, Stefan Kluth, Shlomit Tarem, T. Tsukamoto, B. W. Kennedy, Gilles Beaudoin, A. Rollnik, P. Poffenberger, E. Torrente-Lujan, R. Giacomelli, S. Levegrün, H. M. Fischer, A. Michelini, A. C. Janissen, S. Rossberg, C. J. Oram, G. Mikenberg, A. Gaidot, M. Kuwano, J. von Krogh, T. Wlodek, M. Sproston, R. P. Middleton, P. Routenburg, N. Tesch, A. Dieckmann, D. E. Plane, P. Bentkowski, Dave Robinson, J. R. Carter, G. M. Dallavalle, L. A. del Pozo, S. Schreiber, T. J. McMahon, D. J.P. Dumas, X. C. Lou, J. Schwiening, R. K. Carnegie, J. A. Wilson, P. Bright-Thomas, W. Schappert, P. Weber, R. Lahmann, D. C. Imrie, M. A. Thomson, G. P. Siroli, Christoph Schwick, G. A. Snow, C. P. Ward, D. L. Rees, T. R. Wyatt, R. J. Barlow, H. Przysiezniak, M. J. Losty, M. Fierro, T. Hilse, O. Runolfsson, Claudio Grandi, G. G. Hanson, G. Giacomelli, P. Schenk, M. S. Dixit, Frans Meijers, J. P. Martin, M. Morii, Peter R Hobson, Sachio Komamiya, S. De Jong, E. Ros, T. P. Kokott, Carla Sbarra, J. G. Layter, I. J. Bloodworth, A. Yeaman, N. K. Watson, M. Settles, M. Foucher, G. W. Wilson, D. Karlen, C. Burgard, P. Mättig, C. M. Hawkes, M. Cooper, Daniel Lellouch, Takehiko Mori, D. A. Hinshaw, J. Allison, G. Duckeck, R. Ströhmer, G. T. Zorn, H. M. Bosch, Wolfram Dietrich Zeuner, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, K. Runge, and P. Bock
Subjects: Physics, Nuclear physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, High Energy Physics::Experiment, Electron, Width ratio, Engineering (miscellaneous), High momentum, Lepton
Abstract: The fraction of $$b\bar b$$ events in hadronicZ 0 decays has been measured from the yield of leptons in the data samples collected by OPAL in 1990 and 1991. A sample enriched in events containing $${\rm Z}^0 \to b\bar b$$ decays was obtained by requiring the presence of an electron or muon with high momentum and high momentum component transverse to the associated hadronic jet. After accounting for backgrounds and acceptances, a value of $$\frac{{\Gamma ({\rm Z}^0 \to b\bar b)}}{{\Gamma ({\rm Z}^0 \to hadrons)}} = 0.220 \pm 0.002 \pm 0.0006 \pm 0.011$$ was obtained. The first two errors reflect the data statistics and the systematic uncertainties arising from detector modelling uncertainties, respectively. The third error includes systematic effects fromb andc fragmentation and decay uncertainties.
Published: 1993

20. A measurement ofΓ (Z 0→b $$\Gamma ({\rm Z}^0 \to b\bar b)$$ /Γ(Z 0→hadrons) using an impact parameter technique

Author: Sachio Komamiya, E. Ros, A. T. Watson, A. Astbury, A. Skillman, U. Müller, T. P. Kokott, A. J. Martin, A. Luig, G. A. Snow, C. P. Ward, A. Gaidot, D. L. Rees, P. E.L. Clarke, I. J. Bloodworth, D. A. Hinshaw, James Pinfold, M. Kuwano, T. Wlodek, M. Sproston, J. Steuerer, D. G. Fong, Randall Sobie, G. D. Lafferty, J. Gascon, H. von der Schmitt, H. Przysiezniak, M. Fierro, P. Routenburg, N. Tesch, A. Dieckmann, M. Settles, T. W. Pritchard, F. Lamarche, R. J. Hemingway, C. K. Hargrove, G. Beaudoin, T. Behnke, Silvia Arcelli, P. Jovanovic, M. Foucher, T. Hilse, J. Mildenberger, Harold Nguyen, H. Takeda, F. G. Oakham, J. W. Gary, O. Runolfsson, F. S. Merritt, Austin Ball, Marcello Mannelli, J. E. Duboscq, D. Menszner, R. Yaari, Tohru Takeshita, Shlomo Dado, G. W. Wilson, Alessandro Montanari, D. Karlen, C. Beeston, C. Burgard, J. Hart, Claudio Grandi, S. Bethke, Marco Cuffiani, J. D. Gillies, M. W. Redmond, Otmar Biebel, Andris Skuja, R. J. Barlow, D. J. Miller, X. C. Lou, P. Igo-Kemenes, Georges Azuelos, G. Duckeck, R. Ströhmer, J. M. Lorah, M. J. Pearce, Horst Breuker, G. E. Richards, M. Yurko, Tetsuro Mashimo, P. W. Jeffreys, H. Jeremie, C. M. Hawkes, M. Cooper, J. F. Kral, U. Maur, K. W. Bell, D. G. Charlton, D. L. Wagner, G. T. Zorn, Giora Mikenberg, Daniel Lellouch, John Allison, W. Mohr, S. L. Chu, Gunter Wolf, Gregor Herten, Takehiko Mori, Max Weber, C. Wahl, J. C. Hill, Misao Sasaki, C. Jui, H. M. Bosch, Wolfram Dietrich Zeuner, J. M. Roney, P. Bright-Thomas, B. Wilkens, Matthias Schröder, E. do Couto e Silva, H. Mes, W. Gorn, P. A. Elcombe, I. P. Duerdoth, D. Axen, A. Jawahery, M. A. Thomson, R. G. Kellogg, M. Morii, H. Deng, R. Humbert, H. Lafoux, B. C. Shen, D. S. Koetke, Madjid Boutemeur, Peter Sherwood, J. A. McKenna, John Hobbs, Peter R Hobson, J. E. Pilcher, N. Paz-Jaoshvili, A. K. Honma, W. G. Scott, R. W. Springer, Alexander Wagner, Stefano Marcellini, James Letts, J. Hagemann, J. Ludwig, P. Scharff-Hansen, B. Fabbro, P. G. Estabrooks, R. K. Keeler, B. Panzer-Steindel, K. Runge, P. Bock, A. D. Schaile, R. Kowalewski, J. Becker, M. Hauschild, C. Markus, P. Paschievici, P. M. Watkins, M. J. Losty, Paul Kyberd, F. K. Loebinger, Gideon Bella, V. H. Winterer, A. M. Smith, G. J. VanDalen, Ehud Duchovni, S. Wotton, H. J. Burckhart, G. Vasseur, Jacqueline Batley, B. Lorazo, Norbert Wermes, P. Mättig, Sherry Towers, T. Kawamoto, R.J. Akers, R. Lahmann, D. C. Imrie, A. Rollnik, R. Giacomelli, O. Schaile, R. Bartoldus, J. Goldberg, S. Orito, M. Rosvick, B. Nellen, R. Mir, P. Leblanc, F. Odorici, H. G. Evans, M. J. Goodrick, I. Cohen, H. O. Ogren, Christoph Geich-Gimbel, M. Jimack, M. J. Oreglia, A. Yeaman, N. K. Watson, Erez Etzion, Stefan Kluth, Shlomit Tarem, J. R. Carter, S. Rossberg, C. J. Oram, G. N. Patrick, R. P. Middleton, J. Kroll, F. X. Gentit, J. E. Conboy, A. Pouladdej, H. Ihssen, S. W. O'Neale, S. W. Gensler, G. P. Siroli, K. J. Anderson, S. J. Hillier, Christoph Schwick, T. Kobayashi, C. J. Virtue, P. Poffenberger, Kiyotomo Kawagoe, W. R. Gibson, C. Y. Chang, M. F. Turner, A. Beck, E. Heflin, R. M. Brown, Lorne Levinson, P. Weber, B. W. Kennedy, E. Torrente-Lujan, D. E. Plane, P. Bentkowski, G. M. Dallavalle, D. J.P. Dumas, Gideon Alexander, Paolo Capiluppi, P. M. Hattersley, P. F. Harrison, P. D. Acton, Stephen Lloyd, M. Tecchio, T. J. Smith, K. Stephens, J. R. McNutt, V. Gibson, G. Quast, John Baines, D. R. Ward, G. Transtromer, A. M. Rossi, J. C. Clayton, T. Tsukamoto, S. Levegrün, H. M. Fischer, A. Michelini, A. C. Janissen, D. R. Rust, S. A. Robins, A. M. Lee, S. Barnett, C. Sbarra, D. Hochman, Michael Dittmar, G. Yekutieli, A. A. Carter, Roger Jones, J. Banks, N. J. Tresilian, R. D. Heuer, R. Van Kooten, Fabrizio Fabbri, D. Van den plas, N. I. Geddes, D. Pitman, M. H. Lehto, B. Boden, B. Poli, T. G. Shears, D. M. Gingrich, P. Berlich, L. Köpke, J. P. Martin, T. J. McMahon, M. Hansroul, S. De Jong, J. Schwiening, R. K. Carnegie, C. H. Shepherd-Themistocleous, J. A. Wilson, R. J. Homer, W. Schappert, Margret Fincke-Keeler, J. G. Layter, R. E. Hughes-Jones, J. von Krogh, P. Pfister, G. G. Hanson, G. Giacomelli, Dave Robinson, P. Schenk, M. S. Dixit, Frans Meijers, L. A. del Pozo, C. Moisan, G. A. Beck, Achim Stahl, P. Teixeira-Dias, B. Schmitt, P. S. Wells, Terry Richard Wyatt, M. Coupland, F. C. Grant, M. A. Whalley, A. Buijs, D. M. Strom, C. Stegmann, M. Jones, Claude Leroy, and J. P. Pansart
Subjects: Quark, Physics, Partial width, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Analytical chemistry, Elementary particle, Standard Model, High Energy Physics::Experiment, Impact parameter, Engineering (miscellaneous), Bar (unit)
Abstract: The fractional partial width of theZ0 tob quarks,$\Gamma _{b\bar b} /\Gamma _{had} $, has been measured by OPAL using an impact parameter technique. The method has been developed using 130 000 hadronic events collected by OPAL in 1990. We find: $$\frac{{\Gamma _{b\bar b} }}{{\Gamma _{had} }} = 0.222 \pm 0.007(stat) \pm 0.008(sys).$$ The measurement assumes the relative rates of theZ0 touds andc quarks given by the Standard Model. Varying the charm fraction from the Standard Model value of$\Gamma _{c\bar c} /\Gamma _{had} = 0.171$ changes the result by an additional$\Delta \Gamma _{b\bar b} /\Gamma _{b\bar b} = - 0.135 \times \Delta \Gamma _{c\bar c} /\Gamma _{c\bar c} $.
Published: 1993

21. A measurement of the forward-backward asymmetry of $$e^ + e^ - \to c\bar c$$ and $$e^ + e^ - \to b\bar b$$ at centre of mass energies on and near theZ 0 peak usingD *± mesons

Author: T. J. Smith, K. Stephens, J. R. McNutt, G. Quast, John Baines, D. R. Ward, G. Transtromer, S. Barnett, D. Hochman, G. J. VanDalen, M. Rosvkck, J. C. Clayton, M. Yurko, Silvia Arcelli, S. A. Robins, R. Lahmann, F. S. Merritt, P. W. Jeffreys, Margret Fincke-Keeler, W. R. Gibson, D. C. Imrie, Matthias Schröder, Gunter Wolf, T. Kobayashi, H. Lafoux, N. Paz-Jaoshvili, P. Igo-Kemenes, D. A. Hinshaw, Gregor Herten, C. Wahl, B. Wilkens, P. E.L. Clarke, A. Beck, E. Heflin, G. P. Siroli, E. Lefebvre, J. P. Martin, S. L. Chu, J. King, Christoph Schwick, V. H. Winterer, S. Wotton, C. M. Hawkes, M. Cooper, Daniel Lellouch, Otmar Biebel, G. E. Richards, D. G. Charlton, D. L. Wagner, R. M. Brown, P. Bright-Thomas, H. Jeremie, Lorne Levinson, R. E. Hughes-Jones, U. Maur, A. Skillman, J. E. Pilcher, H. Deng, R. Humbert, J. Lauber, F. Odorici, S. De Jong, M. Morii, P. Pfister, Takehiko Mori, A. Gaidot, Georges Azuelos, Peter R Hobson, V. Gibson, R.J. Akers, B. Fabbro, B. W. Kennedy, Gilles Beaudoin, E. Torrente-Lujan, R. Bartoldus, T. Wlodek, M. Sproston, M. Sasaki, H. Takeda, E. do Couto e Silva, B. Boden, H. O. Ogren, B. Panzer-Steindel, R. G. Kellogg, J. Goldberg, P. Routenburg, J. Schneps, B. Poli, Kiyotomo Kawagoe, Norbert Wermes, J. F. Kral, Christoph Geich-Gimbel, Sherry Towers, T. Kawamoto, M. A. Thomson, G. A. Snow, C. P. Ward, F. G. Oakham, J. A. McKenna, D. S. Koetke, N. Tesch, A. Dieckmann, John Hobbs, K. W. Bell, B. Nellen, D. L. Rees, D. E. Plane, D. Axen, A. Jawahery, P. A. Elcombe, Max Weber, P. Leblanc, Stefano Marcellini, S. Orito, M. J. Pearce, Horst Breuker, J. Hart, P. Bentkowski, G. M. Dallavalle, Gideon Bella, Peter Sherwood, James Letts, J. C. Hill, B. C. Shen, R. Mir, G. D. Lafferty, J. Kroll, C. Moisan, J. Becker, R. W. Springer, Alexander Wagner, S. W. O'Neale, G. A. Beck, J. D. Gillies, H. J. Burckhart, H. Mes, I. P. Duerdoth, T. Takeeshita, J. Hagemann, S. L. Lloyd, F. X. Gentit, Jacqueline Batley, Madjid Boutemeur, Achim Stahl, A. Yeaman, H. G. Evans, A. K. Honma, W. G. Scott, J. Ludwig, K. Runge, P. Bock, J. Mildenberger, Harold Nguyen, P. Mättig, M. J. Goodrick, I. Cohen, D. J.P. Dumas, J. E. Conboy, A. Astbury, P. Teixeira-Dias, F. Scharf, J. Steuerer, J. W. Gary, Shlomo Dado, P. Weber, N. K. Watson, I. J. Bloodworth, C. Jui, P. F. Harrison, U. Müller, N. I. Geddes, A. J. Martin, Sachio Komamiya, D. J. Miller, M. Settles, G. G. Hanson, P. G. Estabrooks, G. Mikenberg, J. Allison, G. Duckeck, R. Ströhmer, M. Tecchio, M. J. Oreglia, M. W. Redmond, X. C. Lou, R. K. Keeler, E. Ros, M. Foucher, M. J. Losty, G. Giacomelli, B. Schmitt, G. T. Zorn, A. D. Schaile, T. Behnke, Erez Etzion, K. J. Anderson, G. W. Wilson, P. Schenk, Paul Kyberd, J. M. Roney, D. Karlen, R. Kowalewski, H. M. Bosch, C. K. Hargrove, Wolfram Dietrich Zeuner, T. P. Kokott, A. Luig, R. J. Barlow, C. Burgard, F. K. Loebinger, M. Hauschild, P. M. Watkins, R. Yaari, G. N. Patrick, Stefan Kluth, S. Bethke, Marco Cuffiani, M. S. Dixit, R. J. Hemingway, Shlomit Tarem, A. M. Rossi, Frans Meijers, J. M. Lorah, Gideon Alexander, H. Przysiezniak, Paolo Capiluppi, C. Markus, T. Tsukamoto, P. Paschievici, C. Y. Chang, H. M. Fischer, S. Rossberg, C. J. Oram, M. F. Turner, A. Rollnik, P. Poffenberger, R. Giacomelli, M. Fierro, A. Michelini, M. Hansroul, Ehud Duchovni, A. C. Janissen, R. P. Middleton, P. Jovanovic, J. G. Layter, M. Jimack, Austin Ball, H. Ihssen, D. Menszner, S. W. Gensler, Alessandro Montanari, S. J. Hillier, T. Hilse, C. H. Shepherd-Themistocleous, T. W. Pritchard, O. Runolfsson, J. R. Carter, R. J. Homer, James Pinfold, D. G. Fong, C. Beeston, Claudio Grandi, P. S. Wells, J. Gascon, H. von der Schmitt, Terry Richard Wyatt, A. T. Watson, M. Coupland, P. M. Hattersley, Marcello Mannelli, J. E. Duboscq, R. W.L. Jones, M. Jones, R. J. Sobie, P. Scharff-Hansen, Claude Leroy, A. M. Smith, J. P. Pansart, G. Vasseur, B. Lorazo, F. C. Grant, M. A. Whalley, Andris Skuja, A. Buijs, D. M. Strom, C. Stegmann, Tetsuro Mashimo, W. Gorn, J. von Krogh, Dave Robinson, L. A. del Pozo, C. Sbarra, Michael Dittmar, G. Yekutieli, A. A. Carter, R. Van Kooten, M. G. Rison, T. J. McMahon, W. Mohr, J. Schwiening, R. K. Carnegie, J. A. Wilson, W. Schappert, D. R. Rust, A. M. Lee, O. Schaile, J. Banks, N. J. Tresilian, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, D. Pitman, M. H. Lehto, T. G. Shears, D. M. Gingrich, and P. Berlich
Subjects: Physics, Quark, Particle physics, Physics and Astronomy (miscellaneous), Meson, media_common.quotation_subject, Electron–positron annihilation, Elementary particle, Asymmetry, Standard Model, Nuclear physics, Charm (quantum number), Engineering (miscellaneous), media_common, Bar (unit)
Abstract: A measurement is presented of the forwardbackward asymmetry of the processes$e^ + e^ + \to c\bar c$ and$e^ + e^ + \to b\bar b$ at centre of mass energies near 91 GeV. Decays of theZ0 into charm and bottom quarks are identified using 6507 chargedD* mesons, reconstructed in the decaysD*±→D0π±→(K∓π±)π±,D*±→D0π±→(K∓π±π0)π± andD*±→D0π±→(K∓π±π∓π±)π±. Thec quark asymmetry on theZ0 peak is measured to be $$A_{FB}^c = 0.052 \pm 0.028(stat.) \pm 0.012(sys.).$$ The energy dependence of the asymmetry has been investigated at energies close to theZ0 peak. Consistency with the predictions of the Standard Model is found.
Published: 1993

22. A test of the flavour independence of the strong interaction for five flavours

Author: James Pinfold, D. G. Fong, J. Gascon, H. von der Schmitt, J. W. Gary, Marcello Mannelli, J. E. Duboscq, Andris Skuja, Tetsuro Mashimo, W. Gorn, P. Scharff-Hansen, A. M. Smith, G. Vasseur, B. Lorazo, P. A. Elcombe, G. Beaudoin, Tohru Takeshita, Gregor Herten, Gideon Bella, J. Becker, Sachio Komamiya, Otmar Biebel, C. Wahl, P. M. Hattersley, B. Wilkens, H. J. Burckhart, Georges Azuelos, P. Igo-Kemenes, F. C. Grant, D. G. Charlton, D. L. Wagner, M. A. Whalley, F. Scharf, Jacqueline Batley, K. Stephens, E. Ros, A. T. Watson, Shlomo Dado, Madjid Boutemeur, J. F. Kral, J. R. McNutt, F. S. Merritt, H. Mes, K. W. Bell, I. P. Duerdoth, Max Weber, J. E. Pilcher, R. Lahmann, J. C. Hill, D. C. Imrie, H. Deng, R. Humbert, X. C. Lou, H. Jeremie, Misao Sasaki, B. C. Shen, M. Hansroul, C. Y. Chang, N. I. Geddes, R.J. Akers, Giora Mikenberg, G. P. Siroli, J. King, A. K. Honma, R. E. Hughes-Jones, A. Buijs, U. Maur, D. M. Strom, Christoph Schwick, W. R. Gibson, P. G. Estabrooks, W. G. Scott, B. Boden, M. F. Turner, O. Schaile, B. Poli, T. P. Kokott, C. Stegmann, A. Luig, J. M. Lorah, R. K. Keeler, V. Gibson, J. A. McKenna, Norbert Wermes, A. Beck, Sherry Towers, T. Kawamoto, G. Quast, R. Kowalewski, E. Heflin, R. M. Brown, Kiyotomo Kawagoe, E. do Couto e Silva, W. Mohr, Lorne Levinson, John Baines, M. J. Losty, R. Bartoldus, P. M. Watkins, G. A. Snow, C. P. Ward, D. L. Rees, C. H. Shepherd-Themistocleous, R. J. Homer, B. W. Kennedy, E. Torrente-Lujan, A. Skillman, P. Weber, A. Gaidot, S. Orito, M. Rosvick, R. Mir, H. Przysiezniak, H. O. Ogren, Christoph Geich-Gimbel, M. Hauschild, D. E. Plane, Margret Fincke-Keeler, M. Fierro, D. R. Ward, G. Transtromer, T. Wlodek, G. T. Zorn, M. Sproston, C. Markus, P. Paschievici, P. Bentkowski, G. M. Dallavalle, Silvia Arcelli, Matthias Schröder, G. J. VanDDalen, B. Fabbro, N. Tesch, A. Dieckmann, E. Lefebvre, P. Poffenberger, J. Banks, M. J. Oreglia, J. Kroll, J. C. Clayton, B. Panzer-Steindel, A. M. Rossi, P. Pfister, F. Odorici, T. Hilse, F. X. Gentit, H. Lafoux, D. J.P. Dumas, T. Tsukamoto, H. M. Fischer, N. Paz-Jaoshvili, N. J. Tresilian, O. Runolfsson, P. S. Wells, A. Michelini, A. C. Janissen, M. Mori, J. R. Carter, G. N. Patrick, Terry Richard Wyatt, Peter R Hobson, C. Beeston, R. D. Heuer, M. Coupland, C. Moisan, Claudio Grandi, Gideon Alexander, P. Routenburg, M. Yurko, G. A. Beck, Fabrizio Fabbri, J. M. Roney, A. Astbury, S. A. Robins, P. W. Jeffreys, Paolo Capiluppi, Achim Stahl, P. Teixeira-Dias, D. Van den plas, U. Müller, M. Jones, A. J. Martin, B. Schmitt, D. Pitman, P. Bright-Thomas, G. Giacomelli, J. Hart, S. W. O'Neale, K. J. Anderson, M. H. Lehto, G. Yukutieli, J. D. Gillies, P. Ma:attig, M. A. Thomson, P. Schenk, A. Yeaman, S. Barnett, J. von Krogh, T. G. Shears, Claude Leroy, N. K. Watson, J. Steuerer, R. J. Barlow, D. Hochman, J. P. Pansart, C. K. Hargrove, M. S. Dixit, D. J. Miller, Frans Meijers, D. M. Gingrich, Dave Robinson, P. F. Harrison, P. E.L. Clarke, M. J. Pearce, Horst Breuker, Stephen Lloyd, J. P. Martin, L. A. del Pozo, C. Sbarra, P. Berlich, J. Lauber, R. Yaari, M. Tecchio, S. Bethke, S. De Jong, Marco Cuffiani, H. Takeda, F. G. Oakham, Michael Dittmar, D. R. Rust, S. L. Chu, Ehud Duchovni, R. J. Hemingway, Erez Etzion, M. Jimack, P. Jovanovic, H. Ihssen, Austin Ball, D. Menszner, A. M. Lee, Stefan Kluth, Shlomit Tarem, J. G. Layter, John Hobbs, Alessandro Montanari, J. E. Conboy, A. A. Carter, S. W. Gensler, S. J. Hillier, Roger Jones, T. Kobayashi, D. Axen, A. Jawahery, R. Van Kooten, S. Rossberg, C. J. Oram, Peter Sherwood, R. W. Springer, Alexander Wagner, M. G. Rison, J. Hagemann, R. P. Middleton, J. Ludwig, K. Runge, P. Bock, Gunter Wolf, T. J. McMahon, G. Duckeck, R. Ströhmer, J. Schwiening, R. K. Carnegie, H. M. Bosch, Wolfram Dietrich Zeuner, J. A. Wilson, S. Wotton, W. Schappert, D. A. Hinshaw, J. Goldberg, T. Behnke, B. Nellen, P. Leblanc, H. G. Evans, M. J. Goodrick, I. Cohen, Randall Sobie, G. D. Lafferty, T. W. Pritchard, A. D. Schaile, V. H. Winterer, G. E. Richard, C. Jui, C. M. Hawkes, M. Cooper, Daniel Lellouch, I. J. Bloodworth, M. Settles, M. Foucher, G. W. Wilson, D. Karlen, C. Burgard, J. Mildenberger, Harold Nguyen, T. J. Smith, Gordon H. Hanson, M. W. Redmond, John Allison, R. G. Kellogg, D. S. Koetke, Stefano Marcellini, James Letts, Paul Kyberd, F. K. Loebinger, A. Rollnik, and R. Giacomelli
Subjects: Quark, Physics, Strange quark, Particle physics, Muon, Annihilation, Physics and Astronomy (miscellaneous), Meson, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Strong interaction, Charge (physics), High Energy Physics::Experiment, Production (computer science), Engineering (miscellaneous), Particle Physics - Experiment
Abstract: We report on a measurement of the ratio of the strong coupling constants$\alpha _s (M_{Z^0 } )$ for various data samples with different quark flavour compositions obtained frome+e− annihilation at LEP. We select events with muons, electrons, andD*± mesons from charm and bottom decays, events with highly energeticKs0 mesons originating predominantly from strange quarks, and events with highly energetic stable charged particles from a combination of up, down and strange quarks. From the jet production rates in these events we obtain from these samples the relative value of αs for the individual quark flavours as $$\begin{gathered} \frac{{\alpha _s^b }}{{\alpha _s^{udsc} }} = 1.017 \pm 0.036,\frac{{\alpha _s^c }}{{\alpha _s^{udsb} }} = 0.918 \pm 0.115, \hfill \\ \frac{{\alpha _s^s }}{{\alpha _s^{udcb} }} = 1.158 \pm 0.164,\frac{{\alpha _s^{uds} }}{{\alpha _s^{cb} }} = 1.038 \pm 0.221, \hfill \\ \end{gathered}$$ with quadratically combined statistical and systematic errors. We also compare the αs values for quarks of diffrent weak isospin, charge and generation. No evidence for a dependence of αs on any of these quark properties is observed. Finally, combining all samples and determining the αsf/αsincl ratio for each flavour, we do not find any dependence of the strong coupling constant on flavour.
Published: 1993

23. Studies of strong and electroweak interactions using final state photon emission in hadronicZ 0 decays

Author: B. C. Shen, Gideon Bella, A. K. Honma, H. J. Burckhart, Jacqueline Batley, W. G. Scott, V. Gibson, G. Quast, Tara Shears, John Baines, R. Kowalewski, Horst Breuker, M. J. Losty, R. Lahmann, D. C. Imrie, T. J. Smith, M. Morii, D. R. Ward, G. Transtromer, Peter R Hobson, P. Mättig, H. O. Ogren, R. Mir, I. J. Bloodworth, P. S. Wells, James Pinfold, T. Mouthuy, C. Y. Chang, M. F. Turner, G. P. Siroli, P. A. Elcombe, Christoph Schwick, Terry Richard Wyatt, S. Barnett, P. Taras, J. Mildenberger, M. Settles, M. Coupland, Christoph Geich-Gimbel, D. G. Fong, Sachio Komamiya, Harold Nguyen, G. T. Zorn, G. Beaudoin, D. Hochman, N. J. Thackray, E. Ros, J. Gascon, H. von der Schmitt, A. Astbury, Mitsuaki Nozaki, M. J. Oreglia, M. Foucher, O. Ganel, F. C. Grant, M. A. Whalley, A. J. Martin, J. Becker, J. Goldberg, A. M. Rossi, C. K. Hargrove, T. P. Kokott, Carla Sbarra, F. Odorici, N. Paz-Jaoshvili, M. Hauschild, Shlomo Dado, J. W. Gary, T. Tsukamoto, B. Nellen, P. Leblanc, S. Levegrün, G. J. VanDalen, G. W. Wilson, J. C. Clayton, D. Karlen, C. Burgard, Marcello Mannelli, J. E. Duboscq, A. Buijs, D. M. Strom, X. C. Lou, C. Markus, P. Paschievici, J. R. Carter, G. N. Patrick, Tohru Takeshita, H. G. Evans, P. Igo-Kemenes, G. Maringer, M. J. Goodrick, I. Cohen, Giora Mikenberg, D. Axen, A. Jawahery, H. Jeremie, Kiyotomo Kawagoe, A. Simon, Otmar Biebel, Georges Azuelos, C. M. Hawkes, P. E.L. Clarke, J. Steuerer, Andris Skuja, M. Cooper, P. Singh, G. Tysarczyk-Niemeyer, R. E. Hughes-Jones, U. Maur, Erez Etzion, G. E. Richards, Daniel Lellouch, D. L. Wagner, C. Jui, Tetsuro Mashimo, Stefan Kluth, Shlomit Tarem, Peter Sherwood, H. Deng, R. Humbert, J. F. Kral, K. W. Bell, P. G. Estabrooks, Max Weber, S. W. O'Neale, Paul Kyberd, F. K. Loebinger, N. I. Geddes, R. W. L. Jones, K. J. Anderson, R. W. Springer, Alexander Wagner, Takehiko Mori, H. Mes, S. Rossberg, C. J. Oram, J. C. Hill, Misao Sasaki, M. Hansroul, J. Hagemann, E. do Couto e Silva, I. P. Duerdoth, M. W. Redmond, W. Gorn, Richard Keeler, J. Ludwig, K. Runge, R. P. Middleton, F. G. Oakham, P. M. Watkins, B. Boden, P. Weber, A. Yeaman, B. Poli, Norbert Wermes, J. Kroll, P. Bock, B. Panzer-Steindel, G. A. Snow, C. P. Ward, A. Rollnik, R. Giacomelli, M. Jobes, U. Binder, J. M. Lorah, P. Scharff-Hansen, C. H. Shepherd-Themistocleous, D. L. Rees, T. Kawamoto, J. Hart, O. Schaile, F. X. Gentit, P. Poffenberger, S. Wotton, R. J. Homer, H. M. Fischer, S. Orito, M. Rosvick, J. D. Gillies, A. Michelini, J. E. Conboy, W. Mohr, J. Banks, Claude Leroy, J. P. Pansart, Silvia Arcelli, A. C. Janissen, M. Jimack, John Allison, R. Yaari, S. Bethke, Marco Cuffiani, A. D. Schaile, N. J. Tresilian, G. Duckeck, R. Ströhmer, N. K. Watson, C. Moisan, J. P. Walker, M. A. Thomson, A. M. Smith, G. A. Beck, D. G. Charton, R. J. Barlow, G. Vasseur, B. Lorazo, R. D. Heuer, P. Teixeira-Dias, Fabrizio Fabbri, A. Gaidot, R. G. Kellogg, D. J. Miller, A. Pouladdej, D. Van den plas, M. Kuwano, T. Wlodek, M. Sproston, D. S. Koetke, Stefano Marcellini, P. M. Hattersley, D. R. Rust, B. Schmitt, H. M. Bosch, S. L. Chu, J. M. Roney, P. Routenburg, James Letts, N. Tesch, A. Dieckmann, Wolfram Dietrich Zeuner, Margret Fincke-Keeler, F. Lamarche, V. H. Winterer, F. S. Merritt, D. A. Hinshaw, R. J. Hemingway, D. Pitman, M. H. Lehto, T. Behnke, P. Jovanovic, J. A. McKenna, Austin Ball, D. Menszner, R. F. McGowan, G. A. Bahn, John Hobbs, P. Berlich, Alessandro Montanari, L. Köpke, W. J. Collins, C. Wahl, Randall Sobie, G. D. Lafferty, J. E. Pilcher, T. W. Pritchard, S. Schreiber, T. J. McMahon, J. Schwiening, R. K. Carnegie, J. A. Wilson, W. Schappert, J. von Krogh, Dave Robinson, L. A. del Pozo, Michael Dittmar, G. Yekutieli, A. A. Carter, R. Van Kooten, W. R. Gibson, A. Beck, E. Heflin, R. M. Brown, Lorne Levinson, B. W. Kennedy, E. Torrente-Lujan, M. Yurko, P. W. Jeffreys, A. M. Lee, D. E. Plane, P. Bentkowski, P. Bright-Thomas, G. M. Dallavalle, Alan Watson, D. J.P. Dumas, H. Przysiezniak, M. Fierro, P. F. Harrison, T. Hilse, P. D. Acton, Stephen Lloyd, O. Runolfsson, M. Tecchio, Phillip Allport, Gideon Alexander, Paolo Capiluppi, Claudio Grandi, Ehud Duchovni, R. Shypit, H. Ihssen, S. W. Gensler, S. J. Hillier, T. Kobayashi, C. J. Virtue, P. Pfister, J. G. Layter, J. P. Martin, S. De Jong, G. G. Hanson, G. Giacomelli, P. Schenk, M. S. Dixit, Frans Meijers, K. Stephens, and J. R. McNutt
Subjects: Quantum chromodynamics, Physics, Quark, Particle physics, Photon, Physics and Astronomy (miscellaneous), Hadron, Electroweak interaction, Type (model theory), Jet (particle physics), Standard Model, Nuclear physics, High Energy Physics::Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: The cross section and jet rates ofZ0 decays into photons and quarks are compared with matrix element Monte Carlos ofO(ααs). Good agreement is found between data and theoretical predictions. From the ratio of events with three jets plus a photon to those with two jets plus a photon, αs in first order is determined to be 0.176±0.010. Combining the cross section of final state photon events with the LEP average hadronic partial decay width of theZ0, the widths of theZ0 into up and down type quarks can be calculated. The results $$\begin{gathered} \Gamma _{u - type} = 242 \pm 46MeV; \hfill \\ \Gamma _{d - type} = 419 \pm 30MeV \hfill \\ \end{gathered} $$ are in good agreement with the standard model expectation. A comparison of the measured cross section as a function ofycut with predictions of QCD shower models shows that, at the current level of accuracy ARIADNE and, to a lesser extent, HERWIG and JETSET can reproduce the measurement.
Published: 1993

24. Search for massive, unstable photinos that violate R parity

Author: R. Bartoldus, C. Y. Chang, M. F. Turner, H. O. Ogren, S. W. O'Neale, K. J. Anderson, B. C. Shen, Christoph Geich-Gimbel, M. Yurko, G. Beaudoin, P. Poffenberger, James Pinfold, C. Moisan, G. A. Beck, H. Mes, I. P. Duerdoth, Erez Etzion, D. Axen, A. Jawahery, Silvia Arcelli, D. G. Fong, J. Gascon, H. von der Schmitt, A. K. Honma, P. W. Jeffreys, Stefan Kluth, M. Jones, Richard Keeler, Shlomit Tarem, Gideon Bella, W. G. Scott, G. Giacomelli, G. T. Zorn, Shlomo Dado, S. L. Chu, R. Kowalewski, Otmar Biebel, Peter Sherwood, G. E. Richards, J. Hart, T. J. Smith, Achim Stahl, P. Teixeira-Dias, R. W. Springer, Alexander Wagner, J. D. Gillies, R.J. Akers, B. Schmitt, J. W. Gary, H. J. Burckhart, Jacqueline Batley, J. C. Clayton, R. J. Barlow, J. Kroll, P. Schenk, O. Schaile, J. Hagemann, J. Ludwig, K. Runge, P. Bock, P. Igo-Kemenes, A. M. Rossi, T. Tsukamoto, S. Levegrün, Marcello Mannelli, J. E. Duboscq, P. Bright-Thomas, H. Jeremie, D. J. Miller, S. Rossberg, C. J. Oram, M. J. Losty, F. X. Gentit, X. C. Lou, Giora Mikenberg, C. Jui, J. E. Conboy, D. G. Charlton, D. L. Wagner, M. S. Dixit, Frans Meijers, P. Mättig, Claude Leroy, J. P. Pansart, U. Maur, I. J. Bloodworth, R. P. Middleton, H. Deng, R. Humbert, N. I. Geddes, A. Pouladdej, F. Odorici, R. Lahmann, J. G. Layter, M. Hansroul, P. Scharff-Hansen, D. A. Hinshaw, D. C. Imrie, J. Goldberg, B. Boden, B. Poli, Gregor Herten, J. M. Roney, M. Settles, Norbert Wermes, A. D. Schaile, Sherry Towers, T. Kawamoto, B. Nellen, F. S. Merritt, C. Wahl, M. Morii, E. do Couto e Silva, M. Foucher, C. H. Shepherd-Themistocleous, Tohru Takeshita, H. M. Fischer, G. A. Snow, B. Wilkens, C. P. Ward, A. M. Smith, H. Takeda, P. Leblanc, John Hobbs, Peter R Hobson, S. Orito, M. Rosvick, R. J. Homer, A. Michelini, A. C. Janissen, D. L. Rees, F. G. Oakham, Madjid Boutemeur, G. W. Wilson, V. H. Winterer, T. Behnke, R. Mir, G. P. Siroli, Georges Azuelos, G. Vasseur, Margret Fincke-Keeler, B. Lorazo, J. E. Pilcher, D. Karlen, C. Burgard, H. Przysiezniak, Andris Skuja, Christoph Schwick, F. Lamarche, P. G. Estabrooks, C. M. Hawkes, M. Cooper, Daniel Lellouch, S. A. Robins, M. Fierro, J. F. Kral, K. W. Bell, J. P. Martin, R. J. Hemingway, J. A. McKenna, M. Hauschild, Tetsuro Mashimo, Takehiko Mori, P. Pfister, P. E.L. Clarke, P. S. Wells, P. M. Watkins, H. G. Evans, S. Barnett, M. J. Oreglia, J. Steuerer, S. De Jong, Max Weber, P. Jovanovic, Austin Ball, M. J. Goodrick, D. Menszner, T. Hilse, Randall Sobie, I. Cohen, G. D. Lafferty, Terry Richard Wyatt, O. Runolfsson, W. Gorn, B. Fabbro, A. Yeaman, B. Panzer-Steindel, J. C. Hill, N. K. Watson, Misao Sasaki, Alessandro Montanari, J. R. Carter, T. W. Pritchard, G. N. Patrick, C. Beeston, M. Coupland, Claudio Grandi, D. Hochman, Sachio Komamiya, Gideon Alexander, Paolo Capiluppi, E. Ros, Gunter Wolf, F. C. Grant, M. A. Whalley, P. M. Hattersley, T. P. Kokott, A. Luig, R. Yaari, S. Bethke, Marco Cuffiani, A. Buijs, D. M. Strom, C. Stegmann, K. Stephens, Kiyotomo Kawagoe, P. F. Harrison, J. R. McNutt, P. D. Acton, Stephen Lloyd, M. Tecchio, Ehud Duchovni, S. Wotton, M. Jimack, P. Weber, H. Ihssen, S. W. Gensler, S. J. Hillier, T. Kobayashi, G. Duckeck, R. Ströhmer, C. J. Virtue, V. Gibson, G. Quast, John Baines, H. M. Bosch, Wolfram Dietrich Zeuner, D. R. Ward, G. Transtromer, A. Astbury, U. Müller, A. J. Martin, Paul Kyberd, F. K. Loebinger, A. Rollnik, R. Giacomelli, John Allison, R. G. Kellogg, D. S. Koetke, Stefano Marcellini, James Letts, J. Mildenberger, Harold Nguyen, Gordon H. Hanson, M. W. Redmond, C. K. Hargrove, Matthias Schröder, H. Lafoux, N. Paz-Jaoshvili, Tara Shears, M. J. Pearce, Horst Breuker, C. Markus, P. Paschievici, D. Pitman, M. H. Lehto, D. M. Gingrich, P. Berlich, L. Köpke, D. R. Rust, A. M. Lee, J. Banks, N. J. Tresilian, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, D. E. Plane, P. Bentkowski, G. M. Dallavalle, Alan Watson, D. J.P. Dumas, W. R. Gibson, A. Beck, E. Heflin, R. M. Brown, Lorne Levinson, B. W. Kennedy, E. Torrente-Lujan, C. Sbarra, Michael Dittmar, G. Yekutieli, A. A. Carter, Roger Jones, R. Van Kooten, R. E. Hughes-Jones, J. von Krogh, Dave Robinson, L. A. del Pozo, T. J. McMahon, J. Schwiening, R. K. Carnegie, J. A. Wilson, W. Schappert, A. Skillman, M. A. Thomson, A. Gaidot, M. Kuwano, T. Wlodek, M. Sproston, P. Routenburg, N. Tesch, A. Dieckmann, P. A. Elcombe, J. Becker, G. J. VanDalen, J. M. Lorah, and W. Mohr
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Magnetic moment, Solar neutrino, High Energy Physics::Phenomenology, Supersymmetry, Parameter space, lcsh:QC1-999, Nuclear physics, R-parity, High Energy Physics::Experiment, Neutrino, Photino, Particle Physics - Experiment, lcsh:Physics, Lepton
Abstract: A search for unstable, massive photinos pair produced in e + e − collisions has been performed using the OPAL detector at LEP. The data sample corresponds to an integrated luminosity of 21 pb −1 collected at center-of-mass energies near the Z 0 resonance. The unstable photino is assumed to decay into τ ± / gn l ( l = e or μ ) final states, thereby violating individual lepton numbers and R parity. This search is inspired by a particular model of supersymmetry which is of interest within the context of solar neutrino experiments because it allows for a large neutrino magnetic moment. The present search excludes a large portion of the parameter space allowed by the model.
Published: 1993

25. Measurement of the B0 and B+ lifetimes

Author: W. R. Gibson, A. Beck, E. Heflin, R. M. Brown, G. Transtromer, B. W. Kennedy, E. Torrente-Lujan, M. Fincke-Keeler, D. E. Plane, P. Bentkowski, Alan Watson, D. J.P. Dumas, Silvia Arcelli, Tara Shears, P. Igo-Kemenes, G. Maringer, R. Sobie, H. Jeremie, R. E. Hughes-Jones, U. Maur, P. Bright-Thomas, Horst Breuker, H. M. Fischer, E. do Couto e Silva, J. Pinfold, C. Burgard, F. C. Grant, P. E.L. Clarke, M. A. Whalley, A. Michelini, A. C. Janissen, O. Ganel, G. A. Snow, C. P. Ward, R. Yaari, H. O. Ogren, Christoph Geich-Gimbel, A. Simon, D. L. Rees, A. Buijs, M. Jobes, Otmar Biebel, G. E. Richards, U. Binder, D. G. Charlton, D. L. Wagner, P. G. Estabrooks, N. Paz-Jaoshvili, P. Scharff-Hansen, J. Kroll, G. Yekutieli, F. X. Gentit, H. Deng, R. Humbert, J. E. Conboy, P. M. Watkins, G. Beaudoin, D. R. Rust, A. Pouladdej, Paul Kyberd, F. K. Loebinger, B. C. Shen, C. Schwick, A. M. Smith, F. S. Merritt, J. Steuerer, D. Strom, G. Vasseur, B. Lorazo, Kiyotomo Kawagoe, A. Astbury, M. W. Redmond, W. G. Scott, Richard Keeler, Norbert Wermes, T. Kawamoto, G. M. Dallavale, N. I. Geddes, A. J. Martin, J. A. McKenna, Shlomo Dado, A. Rollnik, R. Giacomelli, F. G. Oakham, D. Hochman, C. Y. Chang, M. F. Turner, M. Morii, S. Bethke, P. Taras, Peter R Hobson, R. Kowalewski, B. Boden, Marco Cuffiani, Mitsuaki Nozaki, R. F. McGowan, Claude Leroy, D. G. Fong, J. P. Pansart, B. Poli, J. Gascon, J. Hart, S. Orito, P. Weber, S. Tarem, T. Behnke, Sachio Komamiya, E. Ros, X. C. Lou, H. von der Schmitt, M. J. Losty, M. Jimack, H. Ihssen, John Allison, G. Quast, C. K. Hargrove, S. L. Chu, J. R. McNutt, J. D. Gillies, Gideon Bella, P. Pfister, R. Mir, S. W. Gensler, T. P. Kokott, Carla Sbarra, T. Hilse, J. Banks, J. W. Gary, H. J. Burckhart, Jacqueline Batley, T. Mouthuy, S. J. Hillier, P. Paschievici, T. Kobayashi, C. J. Virtue, N. J. Tresilian, P. S. Wells, Terry Richard Wyatt, Marcello Mannelli, J. E. Duboscq, R. D. Heuer, R. G. Kellogg, J. von Krogh, O. Runolfsson, Andris Skuja, Fabrizio Fabbri, M. Coupland, R. J. Barlow, D. Van den plas, G. T. Zorn, O. Schaile, S. Barnett, D. J. Miller, D. S. Koetke, A. D. Schaile, John Hobbs, Tetsuro Mashimo, Dave Robinson, Stefano Marcellini, T. Wlodek, Tohru Takeshita, M. H. Lehto, L. A. del Pozo, James Letts, N. J. Thackray, V. H. Winterer, A. M. Rossi, T. Tsukamoto, S. Levegrün, K. Stephens, Michael Dittmar, F. Lamarche, Claudio Grandi, Georges Azuelos, P. F. Harrison, W. Gorn, M. J. Oreglia, A. Yeaman, J. Mildenberger, Harold Nguyen, R. J. Hemingway, M. A. Thomson, J. F. Kral, K. W. Bell, G. A. Bahan, D. Pitman, A. A. Carter, P. Singh, N. K. Watson, Stephen Lloyd, P. M. Hattersley, Max Weber, M. Tecchio, C. Moisan, J. P. Walker, R. Van Kooten, V. Gibson, P. Berlich, P. Jovanovic, A. Gaidot, M. Sproston, L. Köpke, W. J. Collins, M. Hauschild, J. C. Hill, Misao Sasaki, G. A. Beck, J. R. Carter, Austin Ball, R. W. L. Jones, G. N. Patrick, John Baines, G. D. Lafferty, P. Poffenberger, R. Lahmann, D. Menszner, P. Teixeira-Dias, Phillip Allport, S. W. O'Neale, B. Panzer-Steindel, S. Schreiber, P. Routenburg, C. Markus, C. J. Oram, N. Tesch, A. Dieckmann, Alessandro Montanari, T. W. Pritchard, T. J. McMahon, K. J. Anderson, G. P. Siroli, J. Schwiening, D. R. Ward, J. P. Martin, R. K. Carnegie, P. A. Elcombe, J. Hagemann, D. C. Imrie, H. Przysiezniak, B. Schmitt, J. C. Clayton, J. A. Wilson, S. De Jong, M. Fierro, M. Yurko, M. Rosvick, J. Becker, W. Schappert, A. Wagner, P. W. Jeffreys, A. M. Lee, C. Wahl, G. J. VanDalen, L. Levinson, R. Shypit, M. Hansroul, C. Jui, J. E. Pilcher, D. Lellouch, C. H. Shepherd-Themistocleous, R. J. Homer, J. M. Lorah, W. Mohr, Gideon Alexander, Paolo Capiluppi, D. A. Hinshaw, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, R. W. Springer, J. Ludwig, K. Runge, P. Bock, G. Duckeck, R. Ströhmer, F. Odorici, H. M. Bosch, Wolfram Dietrich Zeuner, G. Mikenberg, H. Mes, I. P. Duerdoth, M. Kwano, J. M. Roney, I. J. Bloodworth, M. Settles, M. Foucher, G. W. Wilson, D. Karlen, A. K. Honma, T. J. Smith, P. Mättig, C. M. Hawkes, M. Cooper, Takehiko Mori, P. D. Acton, E. Duchovni, Erez Etzion, Stefan Kluth, S. Rossberg, J. G. Layter, R. P. Middleton, S. Wotton, G. G. Hanson, J. Goldberg, B. Nellen, P. Leblanc, G. Giacomelli, H. G. Evans, M. J. Goodrick, I. Cohen, P. Schenk, M. S. Dixit, and Frans Meijers
Subjects: Nuclear physics, Physics, Hadronic decay, Nuclear and High Energy Physics, Meson, Silicon, chemistry, Electron–positron annihilation, Hadron, chemistry.chemical_element, Particle Physics - Experiment
Abstract: From a data sample of approximately 240 000 hadronic Z 0 decays recorded during 1991 a sample of about 130 semileptonic B hadron decays containing a D 0 , D + or D ∗+ has been isolated. Using silicon microvertex detector information the decay vertices in these events have been reconstructed. The average B hadron lifetime of the mix of B hadrons in this event sample is measured to be 1.51 −0.14 +0.16 ±0.11 ps. From the distribution of decay times in the different samples the lifetimes of the B 0 and B + mesons are determined to be 1.51 −0.23−0.14 +0.24+0.12 ps and 1.51 −0.28−0.14 +0.30+0.12 ps, respectively. The measured ratio of the B + to B 0 lifetimes of 1.00 −0.25 +0.33 ±0.08 supports expectations that the lifetimes are similar.
Published: 1993

26. Human and rabbit paraoxonases: Purification, cloning, sequencing, mapping and role of polymorphism in organophosphate detoxification

Author: R. J. Richter, R. Humbert, D. A. Adler, C. E. Furlong, C. Hassett, Curtis J. Omiecinski, C. M. Disteche, John W. Crabb, Christine Chapline, L. G. Costa, and J. A. Sundstrom
Subjects: Signal peptide, Molecular Sequence Data, Toxicology, Peptide Mapping, Substrate Specificity, Organophosphorus Compounds, Sequence Homology, Nucleic Acid, Complementary DNA, Animals, Humans, Amino Acid Sequence, Cloning, Molecular, Peptide sequence, chemistry.chemical_classification, Polymorphism, Genetic, Base Sequence, Sequence Homology, Amino Acid, biology, Gene map, Aryldialkylphosphatase, Oligonucleotide, Paraoxonase, DNA, General Medicine, Molecular biology, PON1, Phosphoric Monoester Hydrolases, Amino acid, chemistry, Biochemistry, Inactivation, Metabolic, biology.protein, Rabbits
Abstract: Human and rabbit paraoxonases/arylesterases were purified to homogeneity by chromatographic and gel electrophoretic/isofocusing procedures coupled with activity stains. N-terminal and peptide sequence analysis suggested retention of the secretion signal sequence and allowed design of oligonucleotide probes. The probes were used to isolate a 1294-bp rabbit paraoxonase cDNA clone, which, in turn, was used to isolate three human cDNA clones. Comparison of rabbit and human protein and cDNA sequences indicated a high degree of sequence conservation (approximately 85% identity) and verified that paraoxonase retains its signal sequence (except for the N-terminal Met). The rabbit cDNA encodes a protein of 359 amino acids and the human a protein of 355 amino acids. In situ hybridization demonstrated, as expected, that the paraoxonase gene maps to the long arm of human chromosome 7. Arginine at position 192 specifies high activity paraoxonase and glutamine low activity human paraoxonase. Variation in protein levels explains the variation of enzyme activity observed within a genetic class. Toxicity studies showed that raising rat plasma paraoxonase levels by i.v. administration of partially purified rabbit paraoxonase protected animals against cholinesterase inhibition by paraoxon and chlorpyrifos oxon. Protection correlated with the relative rates of hydrolysis of these two compounds.
Published: 1993

27. Measurement of the averageb hadron lifetime inZ 0 decays

Author: J. Mildenberger, Harold Nguyen, A. Astbury, G. Beaudoin, C. Moisan, G. A. Beck, U. Müller, A. J. Martin, Erez Etzion, Achim Stahl, P. Teixeira-Dias, Tohru Takeshita, I. J. Bloodworth, Shlomo Dado, K. Stephens, Stefan Kluth, A. Skillman, J. R. McNutt, F. S. Merritt, B. Schmitt, Shlomit Tarem, J. G. Layter, Georges Azuelos, A. Gaidot, M. Kuwano, T. Wlodek, D. Axen, C. K. Hargrove, M. Settles, X. C. Lou, A. Jawahery, F. Odorici, M. Sproston, J. F. Kral, K. W. Bell, R. Batoldus, V. Gibson, H. Takeda, G. Quast, Madjid Boutemeur, James Pinfold, D. G. Fong, J. Hart, J. D. Gillies, F. G. Oakham, D. Pitman, S. Rossberg, C. J. Oram, John Baines, T. J. McMahon, M. Foucher, D. J. Miller, J. Gascon, H. von der Schmitt, Gideon Bella, P. Routenburg, N. I. Geddes, Max Weber, Peter Sherwood, F. Lamarche, Margret Fincke-Keeler, Matthias Schröder, Giora Mikenberg, P. Jovanovic, H. J. Burckhart, Sachio Komamiya, C. Jui, Austin Ball, M. H. Lehto, P. G. Estabrooks, R. K. Keeler, N. Tesch, A. Dieckmann, D. Menszner, E. Ros, A. T. Watson, Alessandro Montanari, Paul Kyberd, F. K. Loebinger, J. C. Hill, Misao Sasaki, R. W. Springer, Alexander Wagner, Gideon Alexander, H. Lafoux, R. P. Middleton, Otmar Biebel, Paolo Capiluppi, S. L. Chu, Marcello Mannelli, J. E. Duboscq, G. W. Wilson, D. R. Ward, G. E. Richards, D. E. Plane, C. Y. Chang, J. Schwiening, D. Karlen, C. Burgard, J. Hagemann, J. Ludwig, B. C. Shen, Andris Skuja, T. G. Shears, J. A. McKenna, N. Paz-Jaoshvili, G. Transtromer, D. G. Charlton, D. L. Wagner, B. Boden, K. Runge, Gunter Wolf, A. D. Schaile, Tetsuro Mashimo, P. Bentkowski, T. P. Kokott, P. M. Watkins, P. Igo-Kemenes, P. A. Elcombe, R. K. Carnegie, A. Luig, P. Bock, J. P. Martin, B. Poli, A. K. Honma, Ehud Duchovni, V. H. Winterer, C. M. Hawkes, M. Cooper, M. W. Redmond, P. M. Hattersley, H. Deng, R. Humbert, Daniel Lellouch, J. R. Batley, D. M. Gingrich, Silvia Arcelli, G. A. Snow, C. P. Ward, D. J.P. Dumas, S. De Jong, W. G. Scott, H. Ihssen, H. Jeremie, W. Gorn, P. Pfister, A. Rollnik, R. Giacomelli, J. A. Wilson, H. M. Fischer, D. L. Rees, Takehiko Mori, John Hobbs, W. R. Gibson, J. Becker, S. W. Gensler, R. Kowalewski, R. Lahmann, H. Mes, U. Maur, P. Berlich, A. Michelini, A. C. Janissen, S. Wotton, S. J. Hillier, T. Kobayashi, C. J. Virtue, L. Köpke, J. C. Clayton, D. C. Imrie, D. A. Hinshaw, P. Scharff-Hansen, J. W. Gary, W. Schappert, Randall Sobie, G. D. Lafferty, A. Beck, I. P. Duerdoth, M. J. Losty, J. M. Roney, S. A. Robins, A. M. Smith, E. Heflin, P. E.L. Clarke, T. W. Pritchard, Norbert Wermes, Sherry Towers, G. P. Siroli, Christoph Schwick, J. Steuerer, D. R. Rust, G. Vasseur, B. Lorazo, J. Goldberg, R. M. Brown, Lorne Levinson, G. J. VanDalen, M. Morii, M. Jimack, Peter R Hobson, M. J. Pearce, Horst Breuker, B. Nellen, P. F. Harrison, G. M. Dallavalle, E. do Couto e Silva, P. Leblanc, P. D. Acton, Stephen Lloyd, M. Tecchio, E. Torrente-Lujan, Roger Barlow, John Allison, G. G. Hanson, R. E. Hughes-Jones, H. O. Ogren, T. Behnke, Kiyotomo Kawagoe, Christoph Geich-Gimbel, S. Orito, M. Rosvick, M. Hansroul, H. G. Evans, M. J. Goodrick, R. Yaari, J. von Krogh, A. M. Lee, T. J. Smith, S. Bethke, Marco Cuffiani, I. Cohen, R. Mir, P. Schenk, P. Weber, J. E. Conboy, R. G. Kellogg, M. S. Dixit, A. Yeaman, Frans Meijers, Dave Robinson, D. S. Koetke, A. M. Rossi, N. K. Watson, J. M. Lorah, C. H. Shepherd-Themistocleous, L. A. del Pozo, C. Sbarra, T. Tsukamoto, Stefano Marcellini, S. Levegrün, J. Kroll, R. J. Homer, G. Duckeck, R. Ströhmer, James Letts, W. Mohr, P. Mättig, Michael Dittmar, G. Yekutieli, F. X. Gentit, G. T. Zorn, A. A. Carter, M. J. Oreglia, Roger Jones, R. Van Kooten, H. M. Bosch, Wolfram Dietrich Zeuner, A. Pouladdej, B. Fabbro, J. R. Carter, B. Panzer-Steindel, G. N. Patrick, G. Giacomelli, J. Banks, N. J. Tresilian, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, S. Barnett, D. Hochman, M. Yurko, P. W. Jeffreys, P. Bright-Thomas, R. J. Hemingway, M. A. Thomson, T. Hilse, O. Runolfsson, C. Beeston, Claudio Grandi, H. Przysiezniak, M. Fierro, P. Poffenberger, M. Hauschild, C. Markus, P. Paschievici, F. C. Grant, R.J. Akers, O. Schaile, M. A. Whalley, Gregor Herten, C. Wahl, B. Wilkens, J. E. Pilcher, S. W. O'Neale, K. J. Anderson, M. F. Turner, B. W. Kennedy, A. Buijs, D. M. Strom, C. Stegmann, Tatsuo Kawamoto, M. Jones, Claude Leroy, J. P. Pansart, P. S. Wells, Terry Richard Wyatt, and M. Coupland
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), Maximum likelihood, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Detector, Elementary particle, Electron, Nuclear physics, High Energy Physics::Experiment, Quantum field theory, Engineering (miscellaneous), Particle Physics - Experiment, Lepton
Abstract: A sample of 2610 electron candidates and 2762 muon candidates identified in hadronicZ0 decays has been used to measure the averageb hadron lifetime. These data were recorded with the OPAL detector during 1990 and 1991. Maximum likelihood fits to the distributions of the lepton impact parameters yield an averageb hadron lifetime of $$\tau _b = 1523 \pm 34 \pm 38fs$$ , where the first error is statistical and the second systematic. This result is a weighted average over the semileptonic branching fractions and production rates of theb hadrons produced inZ0 decays.
Published: 1993

28. Precision measurements of the neutral current from hadron and lepton production at LEP

Author: D. Pitman, M. H. Lehto, A. Astbury, H. O. Ogren, Christoph Geich-Gimbel, A. D. Schaile, O. Ganel, A. J. Martin, G. M. Dallavalle, J. E. Conboy, V. H. Winterer, J. von Krogh, J. Kroll, C. Wahl, C. K. Hargrove, P. E.L. Clarke, Dave Robinson, F. X. Gentit, L. A. del Pozo, P. Berlich, J. E. Pilcher, B. Boden, Kiyotomo Kawagoe, J. C. Clayton, J. Steuerer, P. M. Hattersley, A. Pouladdej, T. Hilse, L. Köpke, C. Moisan, J. P. Walker, G. A. Beck, B. Poli, Tohru Takeshita, P. Weber, S. Wotton, A. Simon, Otmar Biebel, G. E. Richards, James Pinfold, Michael Dittmar, G. Yekutieli, O. Runolfsson, P. Teixeira-Dias, J. R. Batley, P. S. Wells, Georges Azuelos, D. G. Charlton, D. L. Wagner, N. Paz-Jaoshvili, S. J. Hiller, R. Lahmann, D. C. Imrie, D. G. Fong, F. Lamarche, A. A. Carter, R. Van Kooten, G. P. Siroli, Christoph Schwick, T. Mouthuy, Terry Richard Wyatt, B. Schmitt, J. M. Lorah, J. Goldberg, K. W. Bell, N. I. Geddes, Max Weber, H. Deng, R. Humbert, Paul Kyberd, F. K. Loebinger, M. Coupland, F. S. Merritt, Silvia Arcelli, W. Mohr, O. Schaile, J. Gascon, H. von der Schmitt, B. Nellen, W. J. Collins, P. Leblanc, G. T. Zorn, J. Banks, Randall Sobie, J. C. Hill, Misao Sasaki, B. C. Shen, H. Mes, R. Yaari, M. W. Redmond, S. Bethke, Tara Shears, P. A. Elcombe, G. D. Lafferty, A. Rollnik, R. Giacomelli, P. Igo-Kemenes, G. Maringer, R. D. Heuer, Fabrizio Fabbri, C. Leroy, A. K. Honma, Richard Keeler, I. P. Duerdoth, Marco Cuffiani, D. E. Plane, C. Y. Chang, Margret Fincke-Keeler, S. Schreiber, T. J. McMahon, J. F. Kral, Horst Breuker, H. Jeremie, D. Van den plas, R. E. Hughes-Jones, A. M. Rossi, T. W. Pritchard, P. Jovanovic, H. G. Evans, J. Becker, P. F. Harrison, W. G. Scott, M. J. Goodrick, I. Cohen, Norbert Wermes, Claudio Grandi, Austin Ball, D. Menszner, G. J. VanDalen, S. W. O'Neale, J. Schwiening, R. K. Carnegie, U. Maur, J. A. McKenna, D. R. Rust, P. D. Acton, Stephen Lloyd, G. A. Snow, C. P. Ward, T. Tsukamoto, K. J. Anderson, R. Kowalewski, S. Levegrün, H. M. Fischer, M. Tecchio, P. Bentkowski, S. L. Chu, S. Barnett, J. Mildenberger, J. P. Pansart, Marcello Mannelli, J. E. Duboscq, Andris Skuja, J. A. Wilson, Harold Nguyen, E. do Coto e Silva, D. L. Rees, A. Michelini, M. A. Thomson, P. Pfister, Alessandro Montanari, A. C. Janissen, M. J. Losty, S. Orito, M. Rosvick, D. Hochman, N. J. Thackray, A. Gaidot, M. F. Turner, M. Kuwano, T. Wlodek, Ehud Duchovni, R. Shypit, R. F. McGowan, P. Taras, J. M. Roney, M. Sproston, Erez Etzion, Tetsuro Mashimo, Stefan Kluth, Shlomit Tarem, M. Hauschild, F. C. Grant, M. A. Whalley, P. Routenburg, N. Tesch, A. Dieckmann, R. Mir, Alan Watson, Mitsuaki Nozaki, W. Schappert, G. Beaudoin, K. Stephens, B. W. Kennedy, J. R. McNutt, H. Ihssen, C. Markus, S. Rossberg, C. J. Oram, P. Paschievici, W. Gorn, John Hobbs, D. J.P. Dumas, G. A. Bahan, M. Jimack, John Allison, P. G. Estabrooks, S. W. Gensler, R. P. Middleton, T. Kobayashi, V. Gibson, F. Odorici, A. Buijs, C. J. Virtue, G. Quast, M. Jobes, U. Binder, P. Poffenberger, C. Jui, P. Scharff-Hansen, W. R. Gibson, Shlomo Dado, M. J. Oreglia, M. Hansroul, D. M. Strom, John Baines, R. G. Kellogg, J. W. Gary, F. G. Oakham, A. M. Smith, P. M. Watkins, Phillip Allport, A. Beck, E. Heflin, C. H. Shepherd-Themistocleous, G. Vasseur, X. C. Lou, B. Lorazo, J. Hart, Tatsuo Kawamoto, R. J. Homer, R. M. Brown, D. S. Koetke, Lorne Levinson, Stefano Marcellini, J. R. Carter, G. N. Patrick, J. D. Gillies, Giora Mikenberg, D. R. Ward, G. Transtromer, E. Torrente-Lujan, Roger Barlow, Gideon Alexander, Paolo Capiluppi, D. J. Miller, James Letts, J. G. Layter, H. Przysiezniak, M. Fierro, M. Yurko, P. W. Jeffreys, J. P. Martin, A. M. Lee, S. De Jong, P. Bright-Thomas, R. J. Hemingway, G. G. Hanson, P. Schenk, M. S. Dixit, Frans Meijers, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, Sachio Komamiya, N. J. Tresilan, R. W. Springer, Alexander Wagner, E. Ros, P. Singh, J. Hagemann, R. W. L. Jones, T. P. Kokott, Carla Sbarra, C. M. Hawkes, M. Cooper, Daniel Lellouch, J. Ludwig, K. Runge, P. Bock, Takehiko Mori, B. Panzer-Steindel, G. Giacomelli, Gideon Bella, H. J. Burckhart, D. A. Hinshaw, A. Yeaman, N. K. Watson, T. J. Smith, T. Behnke, P. Mättig, I. J. Bloodworth, M. Morii, Peter R Hobson, M. Settles, M. Foucher, G. Duckeck, G. W. Wilson, R. Ströhmer, D. Karlen, C. Burgard, H. M. Bosch, and Wolfram Dietrich Zeuner
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Neutral current, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Electroweak interaction, Nuclear physics, Pair production, High Energy Physics::Experiment, Born approximation, Engineering (miscellaneous), Particle Physics - Experiment, Bhabha scattering, Lepton
Abstract: New measurements of the hadronic and leptonic cross sections and of the leptonic forward-backward asymmetries ine+e− collisions are presented. The analysis includes data recorded up to the end of 1991 by the OPAL experiment at LEP, with centre-of-mass energies within ±3 GeV of the Z0 mass. The results are based on a recorded total of 454 000 hadronic and 58 000 leptonic events. A model independent analysis of Z0 parameters based on an extension of the improved Born approximation is presented leading to test of lepton universality and an interpretation of the results within the Standard Model framework. The determination of the mass and width of the Z0 benefit from an improved understanding of the LEP energy calibration.
Published: 1993

29. QCD coherence studies using two particle azimuthal correlations

Author: P. Singh, M. Hauschild, C. Markus, P. Paschievici, T. R. Wyatt, Silvia Arcelli, R. W. L. Jones, M. Hansroul, H. Przysiezniak, P. Le Du, J. C. Clayton, B. Panzer-Steindel, Sachio Komamiya, E. Ros, J. P. Martin, J. Hart, G. Beaudoin, G. Giacomelli, Andris Skuja, C. Wahl, J. D. Gillies, C. P. Howarth, C. H. Shepherd-Themistocleous, J. E. Pilcher, Tetsuro Mashimo, M. Jimack, John Allison, O. Schaile, R. J. Homer, D. Axen, A. Jawahery, S. De Jong, Gideon Bella, Tohru Takeshita, T. J. Smith, D. J. Miller, Shlomo Dado, T. Hilse, A. Simon, T. P. Kokott, Carla Sbarra, Otmar Biebel, G. Tysarczyk-Niemeyer, P. Mättig, O. Runolfsson, G. E. Richards, P. M. Watklins, F. C. Grant, D. G. Charlton, D. L. Wagner, P. Poffenberger, M. A. Whalley, F. S. Merritt, F. Lamarche, C. Moisan, J. P. Walker, Peter Sherwood, Georges Azuelos, W. Gorn, C. M. Hawkes, M. Cooper, Daniel Lellouch, X. C. Lou, R. Van Kooten, P. A. Elcombe, R. W. Springer, Alexander Wagner, D. Pitman, P. Teixeira-Dias, J. F. Kral, K. W. Bell, G. A. Bahan, Takehiko Mori, Claudio Grandi, N. I. Geddes, Max Weber, H. Deng, R. Humbert, G. D. Lafferty, H. Mes, P. Jovanovic, D. C. Imrie, A. Buijs, Giora Mikenberg, J. C. Hill, M. H. Lehto, Austin Ball, D. Menszner, I. P. Duerdoth, M. Yurko, Misao Sasaki, D. M. Strom, P. W. Jeffreys, B. C. Shen, I. J. Bloodworth, C. Jui, J. Hagemann, P. Igo-Kemenes, J. Ludwig, K. Runge, P. Bock, T. Mouthuy, A. M. Lee, Tatsuo Kawamoto, Alessandro Montanari, H. J. Burckardt, R. G. Kellogg, Margret Fincke-Keeler, G. Maringer, A. K. Honma, M. Settles, R. J. Hemingway, P. G. Estabrooks, D. L. Rees, J. Becker, John Hobbs, Stefano Marcellini, W. G. Scott, D. G. Fong, M. Foucher, G. J. VanDalen, A. D. Schaile, James Letts, H. Jeremie, R. E. Hughes-Jones, U. Maur, R. Kowalewski, G. P. Siroli, J. Gascon, H. von der Schmitt, P. Pfister, G. W. Wilson, A. Astbury, K. J. Anderson, D. Karlen, G. A. Snow, C. P. Ward, S. Orito, M. Rosvick, R. Mir, J. A. McKenna, C. Burgard, G. T. Zorn, S. Wotton, F. G. Oakham, G. Duckeck, V. H. Winterer, Christoph Schwick, O. Ganel, J. Mildenberger, Harold Nguyen, V. Gibson, M. J. Losty, R. Ströhmer, P. Berlich, L. Köpke, E. do Couto e Silva, A. J. Martin, P. Taras, A. Yeaman, A. M. Rossi, P. S. Wells, Marcello Mannelli, J. E. Duboscq, Mitsuaki Nozaki, T. Tsukamoto, M. J. Oreglia, B. W. Kennedy, H. M. Fischer, J. Goldberg, P. E.L. Clarke, J. Steuerer, N. K. Watson, R. F. McGowan, M. Jobes, U. Binder, A. Michelini, A. C. Janissen, J. M. Lorah, M. Coupland, B. Nellen, J. Banks, P. Scharff-Hansen, Kiyotomo Kawagoe, W. J. Collins, Randall Sobie, W. Mohr, P. Leblanc, H. M. Bosch, Wolfram Dietrich Zeuner, Paul Kyberd, F. K. Loebinger, N. J. Tresilian, S. Weisz, G. N. Patrick, J. W. Gary, S. Bougerolle, R. D. Heuer, Fabrizio Fabbri, H. O. Ogren, D. Van den plas, Richard Keeler, M. W. Redmond, Christoph Geich-Gimbel, A. M. Smith, G. Vasseur, C. K. Hargrove, T. W. Pritchard, S. Levergrün, A. Rollnik, J. M. Roney, B. Lorazo, J. R. Carter, H. G. Evans, D. R. Rust, M. J. Goodrick, F. Odorici, J. E. Conboy, N. Paz-Jaoshvili, Claude Leroy, P. Lennert, Phillip Allport, I. Cohen, J. P. Pansart, P. Weber, J. Kroll, A. Gaidot, F. X. Gentit, R. Yaari, M. Kuwano, T. Wlodek, M. Sproston, S. Bethke, B. Boden, D. A. Hinshaw, Marco Cuffiani, P. Routenburg, B. Poli, A. Pouladdej, N. Tesch, A. Dieckmann, Erez Etzion, Tara Shears, J. R. Batley, D. E. Plane, C. Y. Chang, Stefan Kluth, Shlomit Tarem, M. Morii, S. W. O'Neale, Stephen Hillier, Peter R Hobson, T. Behnke, S. Rossberg, C. J. Oram, Gideon Alexander, R. P. Middleton, Horst Breuker, Paolo Capiluppi, P. Schenk, Alan Watson, D. J.P. Dumas, P. M. Hattersley, W. R. Gibson, A. Beck, P. F. Harrison, E. Heflin, P. D. Acton, Stephen Lloyd, R. M. Brown, M. Tecchio, Lorne Levinson, N. Wermes, Ehud Duchovni, R. Shypit, Roger Barlow, G. G. Hanson, E.J. Prebys, M. S. Dixit, Frans Meijers, H. Ihssen, S. W. Gensler, T. Kobayashi, C. J. Virtue, G. M. Dallavalle, J. von Krogh, Dave Robinson, L. A. del Pozo, Michael Dittmar, G. Yekutieli, A. A. Carter, S. Schreiber, T. J. McMahon, J. Schwiening, R. K. Carnegie, J. A. Wilson, W. Schappert, S. Barnett, D. Hochman, N. J. Thackray, K. Stephens, J. R. McNutt, G. Quast, John Baines, D. R. Ward, G. Transtromer, J. G. Layter, and M. F. Turner
Subjects: Quantum chromodynamics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Monte Carlo method, Perturbative QCD, Parton, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Parton shower, Engineering (miscellaneous), Particle Physics - Experiment, Coherence (physics)
Abstract: From a sample of 146900 hadronicZ 0 decays recorded by the OPAL detector at LEP, we have studied the azimuthal correlations of particles in hadronic events. It is expected that these correlations are sensitive to interference effects in QCD. We have compared the data to QCD Monte Carlo models which include and which do not include interference effects. We find that the distributions of azimuthal correlations are not reproduced by the parton shower models we have tested unless interference effects are included, no matter which hadronisation scheme is used.
Published: 1993

30. Measurements of $$B^0 - \bar B^0 $$ mixing, $${{\Gamma (Z^0 \to b\bar b)} \mathord{\left/ {\vphantom {{\Gamma (Z^0 \to b\bar b)} {\Gamma (Z^0 \to hadrons)}}} \right. \kern-\nulldelimiterspace} {\Gamma (Z^0 \to hadrons)}}$$ and semileptonic branching ratios forb-flavoured hadrons in hadronicZ 0 decays

Author: F. S. Merritt, Sachio Komamiya, E. Ros, Otmar Biebel, G. E. Richards, D. G. Charlton, D. L. Wagner, Kiyotomo Kawagoe, H. Deng, R. Humbert, T. J. Smith, K. Stephens, Madjid Boutemeur, D. Pitman, M. H. Lehto, M. Yurko, S. A. Robins, J. R. McNutt, T. P. Kokott, A. Luig, B. Fabbro, B. Panzer-Steindel, A. Skillman, B. C. Shen, Gregor Herten, A. Gaidot, T. Wlodek, P. G. Estabrooks, M. Sproston, P. W. Jeffreys, T. G. Shears, N. Tesch, A. Dieckmann, T. Kobayashi, Norbert Wermes, Sherry Towers, P. Weber, Ehud Duchovni, R. K. Keeler, C. Wahl, A. K. Honma, W. G. Scott, B. Wilkens, T. Kawamoto, J. Steuerer, R. G. Kellogg, M. Jimack, P. Igo-Kemenes, R. Bartoldus, D. M. Gingrich, H. Ihssen, J. M. Roney, D. S. Koetke, P. M. Watkins, J. W. Gary, J. E. Pilcher, H. O. Ogren, S. Orito, H. Jeremie, W. R. Gibson, G. Quast, J. M. Lorah, M. Rosvick, John Baines, Gideon Bella, R. E. Hughes-Jones, U. Maur, Stefano Marcellini, S. W. Gensler, M. Hansroul, P. Bright-Thomas, R. Kowalewski, C. Sbarra, M. Jones, Christoph Geich-Gimbel, S. J. Hillier, R. Mir, James Letts, C. J. Virtue, P. Berlich, H. J. Burckhart, Jacqueline Batley, V. Gibson, L. Köpke, H. M. Fischer, M. J. Losty, R. J. Sobie, R.J. Akers, C. H. Shepherd-Themistocleous, A. Beck, M. A. Thomson, W. Mohr, E. Heflin, D. R. Ward, G. Transtromer, J. Kroll, R. M. Brown, D. R. Rust, E. do Couto e Silva, G. J. VanDalen, Michael Dittmar, T. Behnke, P. A. Elcombe, S. L. Lloyd, J. Mildenberger, R. J. Homer, Lorne Levinson, F. X. Gentit, J. E. Conboy, Harold Nguyen, Claude Leroy, G. G. Hanson, A. Michelini, A. C. Janissen, J. C. Clayton, G. Yekutieli, B. W. Kennedy, M. J. Oreglia, P. M. Hattersley, J. Becker, J. P. Pansart, Gilles Beaudoin, E. Torrente-Lujan, T. Hilse, P. F. Harrison, R. Yaari, Silvia Arcelli, F. Scharf, M. Tecchio, Margret Fincke-Keeler, N. I. Geddes, F. C. Grant, A. Yeaman, S. Bethke, O. Runolfsson, M. W. Redmond, A. M. Lee, G. Giacomelli, N. K. Watson, A. A. Carter, M. A. Whalley, Marco Cuffiani, R. Van Kooten, P. Mättig, P. Pfister, Erez Etzion, R. Lahmann, D. C. Imrie, C. Beeston, P. Schenk, E. Lefebvre, C. M. Hawkes, Claudio Grandi, A. Buijs, D. M. Strom, C. Stegmann, M. Cooper, Daniel Lellouch, G. N. Patrick, Gideon Alexander, Stefan Kluth, M. Hauschild, M. S. Dixit, Frans Meijers, M. Sasaki, Takehiko Mori, Paolo Capiluppi, S. L. Chu, Tohru Takeshita, M. G. Rison, F. Odorici, C. Markus, T. W. Pritchard, P. Paschievici, J. R. Carter, G. P. Siroli, J. King, Paul Kyberd, F. K. Loebinger, Christoph Schwick, P. E.L. Clarke, Shlomit Tarem, J. P. Martin, M. Morii, D. E. Plane, O. Schaile, Georges Azuelos, Peter R Hobson, C. Moisan, G. A. Beck, Achim Stahl, P. Teixeira-Dias, J. F. Kral, G. D. Lafferty, P. Bentkowski, P. Routenburg, S. De Jong, G. M. Dallavalle, S. W. O'Neale, P. S. Wells, K. W. Bell, Max Weber, A. Rollnik, P. Poffenberger, R. Giacomelli, J. C. Hill, J. von Krogh, I. J. Bloodworth, J. Banks, N. J. Tresilian, John Hobbs, J. A. McKenna, D. J.P. Dumas, Terry Richard Wyatt, A. T. Watson, S. Rossberg, C. J. Oram, B. Schmitt, R. J. Barlow, H. Przysiezniak, M. Settles, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, M. Coupland, K. J. Anderson, Dave Robinson, A. M. Rossi, T. Tsukamoto, S. Levegrün, M. Fierro, R. P. Middleton, M. Foucher, S. Barnett, C. Y. Chang, J. G. Layter, M. F. Turner, G. W. Wilson, D. Karlen, L. A. del Pozo, C. Burgard, T. J. McMahon, D. Hochman, J. Schwiening, B. Boden, C. Jui, B. Poli, R. K. Carnegie, H. Mes, J. A. Wilson, J. Goldberg, I. P. Duerdoth, B. Nellen, W. Schappert, A. D. Schaile, G. Mikenberg, P. Leblanc, V. H. Winterer, H. G. Evans, M. J. Goodrick, I. Cohen, Gunter Wolf, James Pinfold, D. G. Fong, S. Wotton, J. Gascon, H. von der Schmitt, Marcello Mannelli, J. E. Duboscq, R. W.L. Jones, Andris Skuja, Tetsuro Mashimo, W. Gorn, P. Scharff-Hansen, A. M. Smith, G. Vasseur, B. Lorazo, F. Lamarche, R. J. Hemingway, P. Jovanovic, Austin Ball, D. Menszner, Alessandro Montanari, J. Hart, J. D. Gillies, D. J. Miller, J. Lauber, H. Takeda, F. G. Oakham, G. A. Snow, C. P. Ward, D. L. Rees, M. J. Pearce, Horst Breuker, Shlomo Dado, X. C. Lou, D. A. Hinshaw, A. Astbury, U. Müller, A. J. Martin, C. K. Hargrove, Matthias Schröder, H. Lafoux, N. Paz-Jaoshvili, J. Allison, G. Duckeck, R. Ströhmer, G. T. Zorn, H. M. Bosch, Wolfram Dietrich Zeuner, D. Axen, A. Jawahery, Peter Sherwood, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, K. Runge, and P. Bock
Subjects: Quark, Physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Engineering (miscellaneous), Energy (signal processing), Boson, Bar (unit)
Abstract: From a sample of about 450 000 hadronicZ0 decays, measurements of the average$B^0 - \bar B^0 $ mixing parameter, χ, the branching fraction ofZ0 bosons into hadrons containing bottom quarks,${{\Gamma (Z^0 \to b\bar b)} \mathord{\left/ {\vphantom {{\Gamma (Z^0 \to b\bar b)} {\Gamma (Z^0 \to hadrons)}}} \right. \kern-\nulldelimiterspace} {\Gamma (Z^0 \to hadrons)}}$, the average semileptonic branching ratios for such hadrons,B(b→l) andB(b→c→l), and the mean scaled energy of these hadrons, 〈xE〉, are presented. The measurements were obtained using a simultaneous fit to single-lepton and dilepton events collected with the OPAL detector at LEP, including both electrons and muons. The results are where the errors are statistical and systematic, respectively, in each case. The result forB)b→c→l) excludes decays of the typeb→→l.
Published: 1993

31. Evidence for chain-like production of strange baryon pairs in jets

Author: T. P. Kokott, G. Tysarczyk-Niemeyer, F. X. Gentit, A. Beck, C. Markus, S. Komamiya, W. R. Gibson, G. G. Hanson, S. Dado, John Hobbs, A. M. Lee, F. Odorici, G. A. Snow, C. P. Ward, T. Hilse, J. Schwiening, F. S. Merritt, T. Mashimo, G. W. Wilson, H. O. Ogren, D. L. Rees, K. Stephens, D. Pitman, A. Dieckmann, J. E. Conboy, J. Kroll, S. Bethke, Tara Shears, R. M. Brown, R. J. Hemingway, S. Rossberg, H. Jeremie, Andris Skuja, S. Barnett, J. A. McKenna, H. M. Fischer, M. W. Redmond, W. Mohr, Frans Meijers, Peter R Hobson, G. Duckeck, P. Routenburg, E. Heflin, P. E.L. Clarke, A. Simon, C. Wahl, F. G. Oakham, J. Letts, G. Quast, E. Duchovni, A. Wagner, M. Morii, T. Mori, Horst Breuker, P. A. Elcombe, B. Lorazo, Otmar Biebel, G. N. Patrick, E. do Couto e Silva, M. Cooper, T. Mouthuy, J. Ludwig, A. Yeaman, J. Pinfold, P. M. Watkins, D. C. Imrie, S. Tarem, A. Gaidot, D. Menszner, M. Hansroul, H. G. Evans, T. J. McMahon, P. Weber, D. G. Charlton, D. L. Wagner, M. J. Goodrick, S. De Jong, S. Levegrün, J. Hart, Tohru Takeshita, P. Sherwood, H. M. Bosch, F. Lamarche, M. Yurko, P. Mättig, D. Hochman, W. J. Collins, P. Pfister, H. Przysiezniak, H. Deng, Harold Nguyen, N. K. Watson, P. Bentkowski, J. P. Martin, J. D. Gillies, C. Moisan, G. T. Zorn, M. Jimack, B. Panzer-Steindel, C. Jui, Richard Keeler, G. Beaudoin, T. J. Smith, M. Sasaki, P. Berlich, X. C. Lou, R. Humbert, J. Mildenberger, D. E. Plane, C. Y. Chang, S. Marcellini, J. F. Kral, G. P. Siroli, D. R. Rust, J. C. Clayton, N. Paz-Jaoshvili, P. G. Estabrooks, K. J. Anderson, P. Poffenberger, I. Cohen, C. M. Hawkes, A. Pouladdej, R. E. Hughes-Jones, M. Coupland, C. Burgard, V. Gibson, John Baines, P. Bock, O. Runolfsson, E. Ros, G. Giacomelli, Gideon Bella, J. Hagemann, R. K. Carnegie, C. Leroy, A. C. Janissen, N. I. Geddes, G. Yekutieli, G. Transtromer, M. Kuwano, U. Binder, B. C. Shen, R. Lahmann, W. Schappert, J. C. Hill, H. J. Burckhart, A. Michelini, B. Poli, Carla Sbarra, A. Jawahery, J. P. Pansart, J. R. McNutt, E. Etzion, J. Becker, U. Maur, M. Fierro, T. W. Pritchard, John Allison, R. G. Kellogg, D. S. Koetke, R. W.L. Jones, R. W. Springer, D. R. Ward, B. Boden, P. W. Jeffreys, M. F. Turner, R. Yaari, Mitsuaki Nozaki, B. W. Kennedy, S. Arcelli, V. H. Winterer, G. M. Dallavalle, S. L. Chu, P. Igo-Kemenes, J. von Krogh, P. F. Harrison, H. Mes, Dave Robinson, G. Azuelos, L. A. del Pozo, G. A. Bahan, M. Hauschild, Alan Watson, P. Kyberd, P. D. Acton, R. F. McGowan, C. K. Hargrove, J. A. Wilson, W. G. Scott, A. Rollnik, M. J. Losty, J. M. Lorah, M. Sproston, A. M. Rossi, M. Jobes, G. D. Lafferty, A. J. Martin, P. Leblanc, D. Lellouch, I. P. Duerdoth, C. H. Shepherd-Themistocleous, H. Ihssen, F. K. Loebinger, M. A. Thomson, J. G. Layter, R. Kowalewski, S. Wotton, R. Ströhmer, L. Levinson, M. Rosvick, G. Alexander, P.P. Singh, F. C. Grant, W. Gorn, P. Bright-Thomas, A. Buijs, Kiyotomo Kawagoe, D. M. Strom, C. Grandi, Tatsuo Kawamoto, O. Schaile, S. Schreiber, R. Giacomelli, K. Runge, N. J. Tresilian, B. Nellen, R. Van Kooten, D. J. Miller, M. Dittmar, J. Steuerer, T. Kobayashi, M. Fincke-Keeler, D. Karlen, J. Goldberg, D. Axen, P. Paschievici, A. K. Honma, C. J. Oram, O. Ganel, G. Vasseur, M. Weber, R. Mir, M. Settles, M. Foucher, M. J. Oreglia, T. Wlodek, P. Schenk, J. E. Pilcher, Wolfram Dietrich Zeuner, G. Maringer, N. J. Thackray, M. H. Lehto, G. J. VanDalen, E. Torrente-Lujan, Roger Barlow, M. Cuffiani, G. A. Beck, Ian J Bloodworth, A. A. Carter, G. E. Richards, A. Astbury, P. M. Hattersley, S. Orito, T. Tsukamoto, Austin Ball, A. Montanari, P. Jovanovic, J. Banks, J. R. Carter, N. Tesch, C. J. Virtue, M. A. Whalley, G. Mikenberg, T. R. Wyatt, S. W. O'Neale, L. Köpke, Stefan Kluth, J. R. Batley, R. Sobie, R. P. Middleton, C. Geich-Gimbel, P. S. Wells, R. J. Homer, R. Shypit, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, T. Behnke, J. P. Walker, D. G. Fong, J. Gascon, H. von der Schmitt, J. M. Roney, Marcello Mannelli, J. E. Duboscq, N. Wermes, P. Scharff-Hansen, P. Teixeira-Dias, B. Schmitt, J. W. Gary, A. M. Smith, D. J.P. Dumas, D. A. Hinshaw, A. D. Schaile, K. W. Bell, Stephen Lloyd, M. Tecchio, S. W. Gensler, S. J. Hillier, P. Taras, Phillip Allport, Paolo Capiluppi, C. Schwick, and M. S. Dixit
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Nuclear Theory, Monte Carlo method, Hadron, Strangeness, Nuclear physics, Baryon, High Energy Physics::Experiment, Rapidity, Baryon number, Nuclear Experiment, Particle Physics - Experiment
Abstract: The production dynamics of baryon-antibaryon pairs are investigated using hadronic Z0 decays, recorded with the OPAL detector, which contain at least two identified Λ baryons. The rapidly difference for Λ Λ pairs shows the correlations expected from models with a chain-like production of baryon-antibaryon pairs. If the baryon number of a Λ is compensated by a Λ , the Λ is found with a probability of 53% in an interval of ±0.6 around the Λ rapidity. This correlation strength is weaker than predicted by the Herwig Monte Carlo and the Jetset Monte Carlo with a production chain of baryon-antibaryon, and stronger than predicted by the UCLA model. The observed rapidity correlations can be described by the Jetset Monte Carlo with a dominant production chain of baryon-meson-antibaryon, the popcorn mechanism. In addition to the short range correlations, one finds an indication of a correlation of Λ Λ pairs in opposite hemispheres if both the Λ and the Λ have large rapidities. Such long range correlations are expected if the primary quark flavours are compensated in opposite hemispheres and if these quarks are found in energetic baryons. Rates for simultaneous baryon and strangeness number compensation for Λ Λ , Ξ − Ξ + and Ξ − Λ ( Λ + Λ ) are measured and compared with different Monte Carlo models.
Published: 1993

32. A measurement of (892)± production in hadronic Z0 decays

Author: J. Steuerer, T. Kobayashi, M. Fincke-Keeler, P. D. Acton, S. Bethke, A. Astbury, P. M. Hattersley, J. Letts, G. Quast, E. Duchovni, L. Köpke, W. Mohr, D. R. Rust, P. A. Elcombe, J. Schwiening, S. J. Hillier, F. Odorici, P. Routenburg, C. Geich-Gimbel, J. Hart, R. Shypit, F. G. Oakham, S. Weisz, R. D. Heuer, Fabrizio Fabbri, Tara Shears, A. Simon, J. A. Wilson, D. Van den plas, P. Igo-Kemenes, K. Runge, E. Ros, R. M. Brown, S. Tarem, S. Levegrün, T. Mori, P. Bentkowski, T. J. McMahon, Otmar Biebel, D. G. Charlton, D. L. Wagner, N. J. Tresilian, G. Mikenberg, B. Nellen, P. S. Wells, G. Duckeck, C. M. Hawkes, A. Pouladdej, H. Przysiezniak, H. Deng, E. Torrente-Lujan, X. C. Lou, B. Poli, Tohru Takeshita, R. Humbert, S. W. O'Neale, W. Schappert, Carla Sbarra, Roger Barlow, R. J. Homer, G. G. Hanson, S. Dado, Horst Breuker, H. G. Evans, M. J. Goodrick, G. Beaudoin, S. Wotton, R. Ströhmer, D. Karlen, F. Lamarche, R. Yaari, M. H. Lehto, J. Goldberg, F. C. Grant, C. Markus, G. Giacomelli, T. Hilse, B. C. Shen, L. Levinson, W. Gorn, R. Sobie, G. N. Patrick, H. O. Ogren, S. Bougerolle, E.J. Prebys, P. Paschievici, C. J. Virtue, O. Ganel, S. Komamiya, J. F. Kral, A. M. Lee, D. Axen, D. Pitman, A. K. Honma, G. P. Siroli, N. I. Geddes, T. Wlodek, N. Tesch, Frans Meijers, P. Bright-Thomas, A. Buijs, D. M. Strom, T. P. Kokott, C. Grandi, T. R. Wyatt, S. Arcelli, S. Rossberg, H. Jeremie, M. Jimack, B. Panzer-Steindel, C. Jui, A. Dieckmann, J. E. Conboy, J. C. Hill, Tatsuo Kawamoto, M. Cooper, G. J. VanDalen, Stefan Kluth, S. Schreiber, W. J. Collins, Peter R Hobson, R. J. Hemingway, J. Banks, G. Tysarczyk-Niemeyer, F. X. Gentit, R. Mir, D. J. Miller, P. Weber, J. Kroll, C. J. Oram, F. K. Loebinger, Gideon Bella, G. Yekutieli, D. E. Plane, J. Ludwig, A. Yeaman, M. A. Thomson, E. do Couto e Silva, G. A. Snow, C. P. Ward, E. Heflin, D. L. Rees, K. Stephens, H. J. Burckhart, D. Hochman, J. Pinfold, Jacqueline Batley, Richard Keeler, C. K. Hargrove, M. J. Oreglia, P. Pfister, P. Sherwood, S. Marcellini, Ian J Bloodworth, C. Wahl, T. J. Smith, M. Cuffani, N. K. Watson, A. Beck, C. Moisan, P. M. Watkins, Alan Watson, G. Transtromer, G. Azuelos, D. J.P. Dumas, O. Runolfsson, A. Gaidot, S. Orito, F. S. Merritt, A. Rollnik, W. R. Gibson, M. Sasaki, A. Montanari, S. W. Gensler, R. K. Carnegie, C. Leroy, A. D. Schaile, J. R. Carter, John Hobbs, U. Binder, J. R. McNutt, Austin Ball, A. C. Janissen, C. Y. Chang, M. F. Turner, G. Vasseur, P. Berlich, S. De Jong, M. Weber, E. Etzion, J. Becker, U. Maur, T. Mashimo, M. J. Losty, P. Mättig, M. Sproston, M. Settles, G. A. Bahan, T. Tsukamoto, G. W. Wilson, Mitsuaki Nozaki, J. A. McKenna, J. P. Martin, M. Foucher, J. D. Gillies, J. Mildenberger, B. Lorazo, H. M. Fischer, R. E. Hughes-Jones, A. Wagner, M. Coupland, P. Schenk, B. W. Kennedy, D. C. Imrie, C. Burgard, M. A. Whalley, J. E. Pilcher, V. Gibson, V. H. Winterer, John Baines, G. M. Dallavalle, D. R. Ward, B. Boden, M. Hansroul, P. Teixeira-Dias, P. Taras, J. von Krogh, P. Poffenberger, P. F. Harrison, H. Mes, J. P. Pansart, Phillip Allport, Peter Clarke, Dave Robinson, L. A. del Pozo, M. Hauschild, J. C. Clayton, N. Paz-Jaoshvili, P. G. Estabrooks, I. Cohen, K. J. Anderson, P. Kyberd, W. G. Scott, T. W. Pritchard, John Allison, Paolo Capiluppi, C. Schwick, J. M. Lorah, A. M. Rossi, R. F. McGowan, M. S. Dixit, M. Jobes, G. D. Lafferty, Kiyotomo Kawagoe, P. Leblanc, R. G. Kellogg, D. S. Koetke, R. W.L. Jones, G. E. Richards, K. W. Bell, Stephen Lloyd, M. Tecchio, O. Schaile, D. Menszner, Harold Nguyen, R. P. Middleton, J. Hagemann, P. Bock, A. Michelini, M. Kuwano, R. Lahmann, G. Alexander, P.P. Singh, M. W. Redmond, M. Rosvick, H. M. Bosch, A. A. Carter, T. Mouthuy, G. T. Zorn, N. Wermes, P. Scharff-Hansen, B. Schmitt, J. W. Gary, A. M. Smith, M. Yurko, P. W. Jeffreys, D. A. Hinshaw, Wolfram Dietrich Zeuner, P. Jovanovic, J. P. Walker, D. G. Fong, A. Jawahery, J. Gascon, H. von der Schmitt, J. M. Roney, R. W. Springer, Marcello Mannelli, J. E. Duboscq, Andris Skuja, S. Barnett, A. J. Martin, D. Lellouch, T. Behnke, I. P. Duerdoth, C. H. Shepherd-Themistocleous, H. Ihssen, J. G. Layter, R. Kowalewski, G. Maringer, N. J. Thackray, R. Van Kooten, and M. Dittmar
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Cross section (physics), Particle physics, Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Event (particle physics), Particle Physics - Experiment
Abstract: This is the post-print version of the Article - Copyright @ 1993 Elsevier. Measurements are presented of the inclusive cross section for K∗(892)± production in hadronic decays of the Z0 using a sample of about half a million events recorded with the OPAL experiment at LEP. Charged K∗ mesons are reconstructed in the decay channel K0Sπ±. A mean rate of 0.72±0.02±0.08 K∗ mesons per hadronic event is found. Comparison of the results with predictions of the JETSET and HERWIG models shows that JETSET overestimates the K∗± production cross section while HERWIG is consistent with the data. This study was supported by the Department of Energy, USA, National Science Foundation, USA, Science and Engineering Research Council, UK, Natural Sciences and Engineering Research Council, Canada, Israeli Ministry of Science, Minerva Gesellschaft, Japanese Ministry of Education, Science and Culture (the Monbusho) and a grant under the Monbusho International Science Research Program, American Israeli Bi-national Science Foundation, Direction des Sciences de la Matibre du Commissariat ~ l'Energie Atomique, France, Bundesministerium f'fir Forschung und Technologie, FRG, National Research Council of Canada, Canada, A.P. Sloan Foundation and Junta Nacional de Investigag~o Ciendfica e Tecnolrgica, Portugal.
Published: 1993

33. A study of the electric charge distributions of quark and gluon jets in hadronic Z0 decays

Author: T. W. Pritchard, D. E. Plane, J. Gascon, J. A. Wilson, Horst Breuker, K. Stephens, G. Yekutieli, R. Giacomelli, H. M. Bosch, S. Levegrün, M. Cuffiani, A. Jawahery, D. J. Miller, Tohru Takeshita, M. A. Thomson, I. Cohen, R. F. McGowan, Alan Watson, J. P. Walker, A. M. Rossi, Richard Keeler, J. Mildenberger, M. Weber, I. J. Bloodworth, R. Mir, G. D. Lafferty, R. W. Springer, John Carter, John Hobbs, D. J.P. Dumas, M. Jimack, M. Kuwano, P. Bright-Thomas, P. Kyberd, J. P. Pansart, J. F. Kral, J. Allison, J. Steuerer, D. Karlen, T. Wlodek, R. J. Hemingway, C. J. Oram, A. Gaidot, Gideon Bella, W. R. Gibson, S. W. O'Neale, H. J. Burckhart, P. M. Hattersley, A. Wagner, H. Przysiezniak, F. C. Grant, J. Hagemann, O. Runolfsson, R. Ströhmer, D. C. Imrie, S. Wotton, D. A. Hinshaw, B. Panzer-Steindel, E. Ros, R. J. Homer, J. Hart, A. Astbury, J. P. Martin, A. Rollnik, U. Maur, H. Mes, K. Runge, S. Kluth, G. Vasseur, W. Gorn, D. Hochman, P. Mättig, Carla Sbarra, P. Igo-Kemenes, R. D. Heuer, P. Berlich, B. C. Shen, R. W.L. Jones, J. C. Hill, J. D. Gillies, J. R. Batley, T. J. McMahon, M. A. Whalley, P. Bentkowski, P. A. Elcombe, J. C. Clayton, T. Kawamoto, T. Hilse, J. Pinfold, P. G. Estabrooks, N. Paz-Jaoshvili, D. Van den plas, T. Tsukamoto, A. Beck, D. Menszner, John Baines, J. Becker, G. G. Hanson, P. S. Wells, C. Geich-Gimbel, R. G. Kellogg, G. P. Siroli, J. M. Lorah, G. Transtromer, G. Alexander, A. Pouladdej, Phillip Allport, D. Lellouch, J. Letts, S. Orito, G. J. VanDalen, T. Behnke, Andris Skuja, J. Kroll, M. Dittmar, C. K. Hargrove, D. S. Koetke, G. Maringer, D. R. Ward, V. H. Winterer, R. M. Brown, P. M. Watkins, U. Binder, M. Yurko, T. R. Wyatt, R. J. Barlow, A. M. Lee, M. J. Oreglia, G. T. Zorn, M. Hansroul, B. Nellen, P. Taras, C. Moisan, J. Goldberg, O. Biebel, R. Sobie, S. Bethke, C. Burgard, P. Bock, A. Buijs, C. Schwick, G. Mikenberg, M. Sasaki, N. I. Geddes, T. P. Kokott, L. Levinson, P. Singh, D. M. Strom, S. Tarem, A. Dieckmann, C. J. Virtue, N. J. Tresilian, F. G. Oakham, D. R. Rust, A. A. Carter, T. Mashimo, A. J. Martin, R. P. Middleton, F. S. Merritt, J. E. Pilcher, T. J. Smith, F. X. Gentit, Austin Ball, K. J. Anderson, W. J. Collins, W. Schappert, S. Barnett, Maurice Goodrick, Paolo Capiluppi, E. Heflin, N. K. Watson, C. P. Ward, F. Lamarche, M. Nozaki, B. Schmitt, R. E. Hughes-Jones, G. W. Wilson, P. Poffenberger, O. Ganel, P. Routenburg, C. Wahl, B. Lorazo, J. W. Gary, Harold Nguyen, H. G. Evans, A. D. Schaile, C. Grandi, T. Mori, P. Weber, E. do Couto e Silva, L. Köpke, D. G. Charlton, D. L. Wagner, P. Teixeira-Dias, T. Kobayashi, G. Quast, G. Duckeck, G. Azuelos, W. G. Scott, J. A. McKenna, M. Hauschild, M. S. Dixit, A. Montanari, E. Torrente-Lujan, J. Ludwig, S. De Jong, Wolfram Dietrich Zeuner, H. Deng, S. Marcellini, C. M. Hawkes, J. Schwiening, C. Y. Chang, M. F. Turner, X. C. Lou, P. D. Acton, Stephen Lloyd, M. J. Losty, P. Scharff-Hansen, D. Axen, R. Yaari, P. Pfister, F. Odorici, E. Etzion, M. Rosvick, S. Arcelli, M. Tecchio, M. Coupland, P. Sherwood, G. A. Beck, C. Markus, G. Giacomelli, J. R. McNutt, A. Simon, P. Jovanovic, M. Cooper, H. M. Fischer, S. Rossberg, P. W. Jeffreys, M. Fincke-Keeler, A. M. Smith, H. O. Ogren, M. Settles, M. W. Redmond, R. Shypit, R. Kowalewski, O. Schaile, M. Sproston, G. N. Patrick, K. W. Bell, G. A. Bahan, S. W. Gensler, F. K. Loebinger, B. Poli, S. J. Hillier, M. H. Lehto, J. E. Conboy, P. E.L. Clarke, M. Fierro, D. G. Fong, H. von der Schmitt, H. Jeremie, J. G. Layter, N. Wermes, I. P. Duerdoth, A. Michelini, M. Foucher, P. Leblanc, M. Jobes, Marcello Mannelli, J. E. Duboscq, N. J. Thackray, B. W. Kennedy, T. Mouthuy, P. Paschievici, A. C. Janissen, J. M. Roney, R. Lahmann, H. Ihssen, A. Yeaman, S. Dado, A. K. Honma, S. Komamiya, P. R. Hobson, W. Mohr, Frans Meijers, R. Humbert, J. Banks, P. Schenk, E. Duchovni, G. A. Snow, D. L. Rees, C. Leroy, S. L. Chu, S. Schreiber, V. Gibson, C. Jui, G. Tysarczyk-Niemeyer, K. Kawagoe, P. F. Harrison, R. K. Carnegie, B. Boden, G. M. Dallavalle, J. von Krogh, C. H. Shepherd-Themistocleous, Dave Robinson, N. Tesch, L. A. del Pozo, G. Beaudoin, D. Pitman, G. E. Richards, R. Van Kooten, Franco Luigi Fabbri, and Tara Shears
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Charge conservation, High Energy Physics::Lattice, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, High Energy Physics::Phenomenology, Charge (physics), Jet (particle physics), Bottom quark, Electric charge, Gluon, Nuclear physics, High Energy Physics::Experiment, Particle Physics - Experiment, Lepton
Abstract: A sample of three-jet events containing a lepton with high momentum and transverse momentum is selected from hadronic decays of the Z0. The presence of the lepton indicates the semi-leptonic decay of a bottom quark and allows us, in combination with energy ordering of the jets, to distinguish between quark and gluon jets. The sign of the lepton charge is used to identify jets originating from positively and negatively charged quarks, for the jets with the lepton and for the high energy jets. Defining the jet charge by summing the charge of the particles assigned to a jet, it is observed that the mean jet charge of the quark jets is incompatible with zero and that the sign of the jet charge corresponds to that expected from the charge of the primary quark. In contrast, the mean charge of the gluon jets is consistent with zero.
Published: 1993

34. The forward-backward asymmetry of $$e^ + e^ - \to b\bar b and e^ + e^ - \to c\bar c$$ using leptons in hadronicZ 0 decays

Author: Madjid Boutemeur, Tohru Takeshita, James Pinfold, D. G. Fong, J. Gascon, H. von der Schmitt, S. L. Chu, P. G. Estabrooks, R. K. Keeler, Georges Azuelos, D. Pitman, S. Barnett, P. M. Hattersley, M. H. Lehto, P. M. Watkins, J. F. Kral, K. W. Bell, C. Y. Chang, M. F. Turner, F. Odorici, J. W. Gary, Max Weber, H. Mes, I. P. Duerdoth, R. Mir, D. Hochman, C. Sbarra, Marcello Mannelli, J. E. Duboscq, J. C. Hill, T. G. Shears, Misao Sasaki, M. Yurko, John Hobbs, Erez Etzion, Michael Dittmar, R. Lahmann, H. M. Fischer, M. J. Pearce, Horst Breuker, F. S. Merritt, G. Yekutieli, J. C. Clayton, Silvia Arcelli, Stefan Kluth, D. M. Gingrich, Shlomit Tarem, D. C. Imrie, B. C. Shen, B. Fabbro, B. Panzer-Steindel, J. G. Layter, P. W. Jeffreys, A. K. Honma, C. Moisan, P. Scharff-Hansen, M. J. Oreglia, S. Rossberg, P. Berlich, C. J. Oram, L. Köpke, G. P. Siroli, R. P. Middleton, W. G. Scott, G. Beaudoin, A. A. Carter, G. A. Beck, Christoph Schwick, Achim Stahl, J. Mildenberger, Harold Nguyen, P. Teixeira-Dias, P. E.L. Clarke, A. D. Schaile, J. Steuerer, Matthias Schröder, Gunter Wolf, Roger Jones, R. Van Kooten, P. F. Harrison, J. A. McKenna, A. M. Smith, G. Vasseur, R. Kowalewski, M. J. Losty, J. M. Lorah, D. R. Rust, Gideon Bella, H. J. Burckhart, Jacqueline Batley, H. Lafoux, N. Paz-Jaoshvili, S. Wotton, A. Michelini, J. R. Carter, G. N. Patrick, Otmar Biebel, P. D. Acton, Stephen Lloyd, A. Yeaman, G. E. Richards, D. G. Charlton, D. L. Wagner, P. Bright-Thomas, M. Tecchio, G. A. Snow, C. P. Ward, Kiyotomo Kawagoe, B. Lorazo, B. Schmitt, J. M. Roney, Andris Skuja, V. H. Winterer, A. M. Lee, M. W. Redmond, P. Igo-Kemenes, H. Jeremie, T. J. Smith, A. C. Janissen, K. Stephens, H. Deng, Margret Fincke-Keeler, N. K. Watson, J. R. McNutt, Sachio Komamiya, T. J. McMahon, R. Humbert, P. Mättig, R. Bartoldus, D. A. Hinshaw, D. L. Rees, R. Yaari, Tetsuro Mashimo, J. Goldberg, M. A. Thomson, H. O. Ogren, W. Mohr, J. Schwiening, U. Maur, B. Nellen, P. Leblanc, E. Ros, A. T. Watson, P. Weber, S. A. Robins, R. K. Carnegie, S. Bethke, Christoph Geich-Gimbel, Marco Cuffiani, A. Astbury, V. Gibson, G. Quast, J. A. Wilson, T. P. Kokott, H. G. Evans, A. Luig, U. Müller, Paul Kyberd, I. J. Bloodworth, P. Pfister, F. K. Loebinger, T. Behnke, J. Kroll, R.J. Akers, Gideon Alexander, P. S. Wells, M. J. Goodrick, Paolo Capiluppi, Norbert Wermes, W. J. Collins, Sherry Towers, John Baines, I. Cohen, T. Kawamoto, T. Hilse, A. J. Martin, P. A. Elcombe, S. W. O'Neale, F. X. Gentit, K. J. Anderson, J. E. Conboy, Randall Sobie, G. D. Lafferty, W. Schappert, O. Runolfsson, J. Banks, Ehud Duchovni, R. Shypit, S. Orito, M. Rosvick, M. Settles, A. Pouladdej, Shlomo Dado, G. Duckeck, R. Ströhmer, M. Jimack, Terry Richard Wyatt, G. T. Zorn, H. Ihssen, N. J. Tresilian, D. R. Ward, T. W. Pritchard, E. do Couto e Silva, G. Transtromer, S. W. Gensler, R. D. Heuer, A. Rollnik, R. Giacomelli, H. M. Bosch, C. K. Hargrove, Wolfram Dietrich Zeuner, M. Foucher, C. Beeston, X. C. Lou, Fabrizio Fabbri, S. J. Hillier, T. Kobayashi, M. Coupland, Claudio Grandi, C. J. Virtue, M. Morii, Peter R Hobson, P. Poffenberger, R. E. Hughes-Jones, O. Schaile, D. Axen, A. Jawahery, C. Gorn, Peter Sherwood, D. Van del Plas, J. Becker, R. W. Springer, Alexander Wagner, M. Hansroul, John Allison, G. W. Wilson, D. Karlen, J. Hagemann, J. Ludwig, Giora Mikenberg, K. Runge, J. von Krogh, P. Bock, M. Jones, C. Burgard, A. M. Rossi, T. Tsukamoto, S. Levegrün, C. M. Hawkes, G. J. VanDalen, M. Cooper, Daniel Lellouch, C. H. Shepherd-Themistocleous, Dave Robinson, R. G. Kellogg, R. J. Homer, Takehiko Mori, W. R. Gibson, L. A. del Pozo, D. S. Koetke, N. I. Geddes, Stefano Marcellini, James Letts, Claude Leroy, J. P. Pansart, B. Boden, B. Poli, C. Jui, A. Skillman, F. C. Grant, M. A. Whalley, M. Hauschild, A. Beck, A. Buijs, D. M. Strom, A. Gaidot, M. Kuwano, C. Stegmann, E. Heflin, R. M. Brown, Lorne Levinson, T. Wlodek, M. Sproston, C. Markus, H. Przysiezniak, P. Routenburg, P. Paschievici, N. Tesch, A. Dieckmann, B. W. Kennedy, M. Fierro, E. Torrente-Lujan, D. E. Plane, P. Bentkowski, G. M. Dallavalle, D. J.P. Dumas, Gregor Herten, C. Wahl, B. Wilkens, J. E. Pilcher, G. G. Hanson, G. Giacomelli, P. Schenk, M. S. Dixit, Frans Meijers, J. P. Martin, S. De Jong, J. Hart, J. D. Gillies, R. J. Barlow, D. J. Miller, F. Lamarche, R. J. Hemingway, P. Jovanovic, Austin Ball, D. Menszner, Alessandro Montanari, H. Takeda, and F. G. Oakham
Subjects: Physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), Electron–positron annihilation, media_common.quotation_subject, Hadron, Asymmetry, Nuclear physics, Momentum, Engineering (miscellaneous), Energy (signal processing), Lepton, Bar (unit), media_common
Abstract: The forward-backward asymmetries of $$e^ + e^ - \to Z^0 \to b\bar b and e^ + e^ - \to Z^0 \to c\bar c$$ have been measured by the OPAL Collaboration using samples of hadronicZ 0 decays in which electron or muon candidates were observed. The asymmetries were measured simultaneously in a two parameter fit, which used the distributions of the track momentum and transverse momentum component with respect to the associated jet to distinguish lepton candidates from different sources. From a sample of 360 000 hadronic events with centre-of-mass energies within ±0.5 GeV of theZ 0 mass and mean energy 91.24. GeV, the values obtained for the $$b\bar b$$ asymmetry before and after correcting, for the effect of $$B^0 \overline {B^0 } $$ mixing, and for the $$c\bar c$$ asymmetry are, respectively: $$\begin{gathered} A_{FB}^{b,mix} = 0.070 \pm 0.014(stat) \pm 0.005(sys), \hfill \\ A_{FB}^b = 0.092 \pm 0.018(stat) \pm 0.007(sys) \hfill \\ \pm 0.003(mix), \hfill \\ A_{FB}^c = 0.014 \pm 0.030(stat) \pm 0.020(sys). \hfill \\ \end{gathered} $$ The measurement of the $$b\bar b$$ asymmetry is confirmed by a measurement using only leptons with high transverse momentum. This sample is highly enriched in semileptonic decays ofb hadrons. Measurements using high transverse momentum leptons were also performed using samples of events with centre-of-mass energies further from theZ 0 mass. After correcting for the effect of $$B^0 \overline {B^0 } $$ mixing, the results are: $$\begin{gathered} A_{FB}^b (\langle \sqrt s \rangle = 89.66GeV) \hfill \\ = 0.071 \pm 0.054(stat) \pm 0.007(sys) \pm 0.002(mix), \hfill \\ A_{FB}^b (\langle \sqrt s \rangle = 92.75GeV) \hfill \\ = 0.131 \pm 0.047(stat) \pm 0.012(sys) \pm 0.004(mix). \hfill \\ \end{gathered} $$
Published: 1993

35. The data acquisition system of the OPAL detector at LEP

Author: P. Farthouat, R. P. Middleton, P. Scharff-Hansen, W. Gorn, M. Jimack, R. E. Hughes-Jones, F. X. Gentit, N. I. Geddes, P. S. Wells, N. K. Watson, T. Tsukamoto, A. J. Martin, G. P. Siroli, Berry Holl, S. Wotton, Randall Sobie, F. Lamarche, R. Humbert, P. Schenk, Claus Kleinwort, B. P. O'Neill, John Hart, O. Schaile, Alessandro Montanari, R. W. L. Jones, C. Fukunaga, J. P. Martin, John Hill, P. Le Du, H. von der Schmitt, H. J. Burckhart, R. Shypit, P.A. Elcombe, C. N. P. Gee, Lorne Levinson, Frans Meijers, G. Quast, John Baines, Stephen Hillier, Alan Watson, G. Crone, D. Strom, Wolfram Dietrich Zeuner, F. Beck, D. G. Charlton, R. Cranfield, Peter Sherwood, R. W. Springer, Daniel Lellouch, J. Raab, Dave Robinson, and T. J. Smith
Subjects: Physics, Nuclear and High Energy Physics, Modularity (networks), Workstation, business.industry, Local area network, Minicomputer, law.invention, Software, Data acquisition, law, Detectors and Experimental Techniques, business, Instrumentation, Computer hardware, Event reconstruction, VMEbus
Abstract: This report describes the 1991 implementation of the data acquisition system of the OPAL detector at LEP including the additional services and infrastructure necessary for its correct and reliable operation. The various tasks in this “on-line” environment are distributed amongst many VME subsystems, workstations and minicomputers which communicate over general purpose local area networks and special purpose buses. The tasks include data acquisition, control, monitoring, calibration and event reconstruction. The modularity of both hardware and software facilitates the upgrading of the system to meet new requirements.
Published: 1993

36. The OPAL silicon microvertex detector

Author: R. Shaw, Jacqueline Batley, A. J. Martin, M. Uldry, R. Humbert, John Hobbs, X. C. Lou, U. C. Dunwoody, P. Singh, C. Leroy, W. Gorn, A. A. Carter, Paul Seller, J. C. Hill, P.R. Goldey, Phillip Allport, Paolo Capiluppi, O. Runolfsson, D. Voillat, C. J. Oram, J. R. Carter, M. J. Goodrick, J. P. Martin, C. Moisan, John Hill, S. De Jong, M. F. Turner, R. Hammarström, G. G. Hanson, W. Glessing, F. R. Jacob, Paul Kyberd, V. Gibson, D. R. Ward, K. H. Wolf, T. W. Pritchard, and M. Jiminez
Subjects: Physics, Nuclear and High Energy Physics, Silicon, business.industry, Detector, chemistry.chemical_element, Integrated circuit, Semiconductor device, Particle detector, law.invention, Semiconductor detector, Nuclear physics, chemistry, law, Microelectronics, Optoelectronics, Collider, business, Instrumentation
Abstract: A silicon strip microvertex detector has been designed, constructed and commissioned in the OPAL experiment at the LEP electron-positron collider. The microstrip devices incorporate a new FoxFET biassing scheme developed together with Micron Semiconductor Ltd., UK. The devices digitise with a precision close to 5 μm and have an exceptionally high signal-to-noise ratio. The associated microelectronics were all custom made for the OPAL project. The detector began operation in 1991 and has since continued to be part of the OPAL experiment, performing to a very high standard and opening up new areas of physics studies.
Published: 1993

37. Radiophotographic examinations in the canton of Neuchâtel

Author: R, HUMBERT
Subjects: X-Rays
Published: 2010

38. Hypervitaminosis in a newborn baby?

Author: R, HUMBERT
Subjects: Fetus, Infant, Newborn, Humans, Infant, Disease, Vitamins, Infant, Newborn, Diseases
Published: 2010

39. Inclusive neutral vector meson production in hadronicZ 0 decays

Author: P. Igo-Kemenes, C. Moisan, J. P. Walker, J. Goldberg, P. Teixeira-Dias, G. Maringer, B. Nellen, H. Jeremie, R. E. Hughes-Jones, U. Maur, M. Hauschild, P. M. Hattersley, R. Mir, P. Leblanc, V. Gibson, J. M. Lorah, I. J. Bloodworth, D. C. Imrie, Kiyotomo Kawagoe, C. Markus, P. Paschievici, Sachio Komamiya, G. P. Siroli, Christoph Schwick, J. M. Roney, D. A. Hinshaw, P. Weber, E. Ros, H. Mes, I. P. Duerdoth, S. Schreiber, A. Astbury, T. J. McMahon, D. J. Miller, W. Mohr, B. C. Shen, H. G. Evans, E. do Couto e Silva, P. E.L. Clarke, M. J. Goodrick, I. Cohen, M. Jimack, M. Hansroul, M. Yurko, M. J. Oreglia, R. Van Kooten, P. W. Jeffreys, D. Pitman, T. P. Kokott, Carla Sbarra, John Allison, O. Ganel, A. J. Martin, J. Schwiening, R. K. Carnegie, A. K. Honma, W. G. Scott, J. Steuerer, F. G. Oakham, M. Settles, P. S. Wells, R. G. Kellogg, J. G. Layter, A. M. Lee, M. Jobes, U. Binder, A. D. Schaile, C. H. Shepherd-Themistocleous, M. F. Turner, T. Behnke, P. Scharff-Hansen, M. H. Lehto, M. Foucher, P. A. Elcombe, R. J. Homer, R. Kowalewski, Terry Richard Wyatt, J. C. Clayton, Stefano Marcellini, J. A. Wilson, James Letts, Margret Fincke-Keeler, M. Coupland, G. A. Snow, C. P. Ward, D. L. Rees, J. Becker, T. Mouthuy, G. N. Patrick, F. S. Merritt, Paul Kyberd, O. Schaile, G. W. Wilson, S. Wotton, W. Schappert, F. K. Loebinger, D. Axen, A. Jawahery, M. J. Losty, A. Skuja, D. Karlen, A. Simon, Otmar Biebel, J. Hart, A. M. Smith, V. H. Winterer, M. W. Redmond, G. T. Zorn, G. Tysarczyk-Niemeyer, G. E. Richards, D. G. Charlton, D. L. Wagner, R. Yaari, G. Vasseur, P. Pfister, C. M. Hawkes, M. Cooper, Daniel Lellouch, S. Bethke, Marco Cuffiani, P. Poffenberger, Richard Keeler, G. Beaudoin, J. D. Gillies, J. P. Martin, C. K. Hargrove, M. Manelli, H. Deng, R. Humbert, Peter Sherwood, B. Lorazo, R. W. Springer, Alexander Wagner, A. Rollnik, A. M. Rossi, P. Berlich, L. Köpke, Takehiko Mori, R. J. Barlow, M. Morii, Michael Dittmar, J. Hagemann, J. Ludwig, H. Przysiezniak, G. J. Van Dalen, G. Yekutieli, K. Runge, P. Bock, S. De Jong, Peter R Hobson, D. R. Rust, Tetsuro Mashimo, T. Tsukamoto, P. Lennert, S. Levegrün, A. Gaidot, M. Kuwano, T. Wlodek, K. Stephens, Claude Leroy, Tohru Takeshita, Shlomo Dado, J. R. McNutt, M. Sproston, J. P. Pansart, T. Kawamoto, J. A. McKenna, F. Lamarche, F. Odorici, N. Paz-Jaoshvili, C. Wahl, W. J. Collins, Erez Etzion, P. Routenburg, F. C. Grant, M. A. Whalley, R. J. Hemingway, A. A. Carter, Randall Sobie, G. D. Lafferty, J. Mildenberger, N. Tesch, A. Dieckmann, C. P. Howarth, T. Hilse, Harold Nguyen, X. C. Lou, S. Orito, Stefan Kluth, M. Rosvick, Shlomit Tarem, P. Jovanovic, R. F. McGowan, Austin Ball, O. Runolfsson, D. Menszner, G. Duckeck, R. Ströhmer, Georges Azuelos, J. E. Pilcher, G. Quast, John Baines, A. Buijs, D. M. Strom, S. Rossberg, W. Gorn, Alessandro Montanari, John Hobbs, Giora Mikenberg, H. O. Ogren, Claudio Grandi, C. J. Oram, G. A. Bahan, Tara Shears, J. F. Kral, K. W. Bell, S. W. O'Neale, D. R. Ward, C. Y. Chang, G. Transtromer, T. W. Pritchard, H. M. Bosch, R. P. Middleton, Christoph Geich-Gimbel, Max Weber, T. J. Smith, A. Yeaman, N. K. Watson, J. Banks, Wolfram Dietrich Zeuner, G. G. Hanson, N. J. Tresilian, P. Taras, J. C. Hill, Misao Sasaki, S. Weisz, R. D. Heuer, Mitsuaki Nozaki, D. G. Fong, Fabrizio Fabbri, P. Mättig, J. Kroll, Horst Breuker, D. Van den plas, J. Gascon, S. Barnett, G. Giacomelli, H. von der Schmitt, N. J. Thackray, E.J. Prebys, F. X. Gentit, J. von Krogh, J. E. Conboy, J. W. Gary, M. S. Dixit, Frans Meijers, J. E. Duboscq, Dave Robinson, L. A. del Pozo, A. Pouladdej, K. J. Anderson, C. Jui, N. I. Geddes, B. Boden, B. Poli, H. M. Fischer, A. Michelini, A. C. Janissen, J. R. Carter, D. Hochmann, Silvia Arcelli, Phillip Allport, P. Singh, Gideon Alexander, Paolo Capiluppi, P. Schenk, R. W. L. Jones, N. Wermes, Ehud Duchovni, R. Shypit, P. Le Du, B. Panzer-Steindel, H. Ihssen, S. W. Gensler, T. Kobayashi, C. J. Virtue, P. G. Estabrooks, Gideon Bella, H. J. Burckhart, Jacqueline Batley, P. M. Watkins, P. F. Harrison, P. D. Acton, Stephen Lloyd, M. Tecchio, D. E. Plane, Stephen Hillier, G. M. Dallavalle, Alan Watson, D. J.P. Dumas, S. Bougerolle, W. R. Gibson, A. Beck, E. Heflin, R. M. Brown, Lorne Levinson, and B. W. Kennedy
Subjects: Physics, Particle physics, Meson production, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Monte Carlo method, Nuclear physics, Pion, Mass spectrum, High Energy Physics::Experiment, Neutral vector, Ionization energy, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: Results are reported of a study of neutral vector meson production in multihadronicZ0 decays in the OPAL experiment at LEP. Pions and kaons have been identified by specific ionisation energy loss andK±π∓ andK+K− mass spectra have been fitted, in bins of the scaled momentum variablexp, to combinations of resonance signals and non-resonant backgrounds. Rates are given forK*(892)° and o(1020), and production cross sections are compared to the predictions of Monte Carlo models. Overall multiplicities have been determined as 0.76±0.07±0.06K*(892)° and 0.086±0.015±0.010 o(1020) per hadronicZ0 decay (the quoted errors are respectively statistical and systematic). Momentum dependent distortions of the ππ mass spectra, possibly associated indirectly with Bose-Einstein effects, have prevented reliable measurement of the ρ(770)° cross section in this study.
Published: 1992

40. A study of charged particle multiplicities in hadronic decays of theZ 0

Author: W. R. Gibson, C. Ho, R. Mir, H. Mes, A. Beck, H. Oh, E. Heflin, Margret Fincke-Keeler, I. P. Duerdoth, R. M. Brown, Lorne Levinson, B. W. Kennedy, K. J. Anderson, S. Bougerolle, F. Lamarche, R. J. Hemingway, D. E. Plane, Stephen Hillier, G. M. Dallavalle, Alan Watson, D. J.P. Dumas, M. Jobes, K. Stephens, J. R. McNutt, N. C. Wood, M. Jimack, John Allison, J. Goldberg, P. Jovanovic, Austin Ball, D. Menszner, F. Odorici, U. Binder, G. A. Snow, C. P. Ward, P. Pfister, J. P. Martin, M. W. Moss, P. M. Hattersley, M. J. Oreglia, J. R. Carter, G. N. Patrick, Silvia Arcelli, C. Fukunaga, P. Scharff-Hansen, W. J. Larson, R. G. Kellogg, B. Holl, I. Zacharov, Horst Breuker, B. Nellen, Alessandro Montanari, P. A. Elcombe, D. J. Miller, O. Runolfsson, V. Gibson, G. Quast, S. De Jong, John Baines, P. Leblanc, A. Astbury, D. C. Imrie, S. Wotton, Phillip Allport, G. Beaudoin, John Hobbs, Stefano Marcellini, J. Banks, P. Igo-Kemenes, T. Mouthuy, A. M. Smith, O. Ganel, James Letts, M. Weymann, G. Maringer, H. Jeremie, A. J. Martin, J. L. Pinfold, Tohru Takeshita, R. E. Hughes-Jones, U. Maur, A. Simon, G. P. Siroli, P. S. Wells, M. Hauschild, D. R. Ward, Shlomo Dado, G. Vasseur, D. L. Rees, B. Lorazo, M. Hansroul, H. E. Stier, Claudio Grandi, F. S. Merritt, K. Riles, G. Transtromer, J. Becker, P. G. Estabrooks, G. T. Zorn, A. M. Rossi, S. Levegrün, M. Yurko, S. Weisz, R. D. Heuer, Fabrizio Fabbri, M. J. Goodrick, Otmar Biebel, D. G. Charlton, P. Paschievici, C. J. Virtue, Terry Richard Wyatt, M. Coupland, P. Debu, I. Cohen, J. Mildenberger, Harold Nguyen, N. K. Watson, B. B. Brabson, P. W. Jeffreys, D. Van den plas, C. K. Hargrove, X. C. Lou, Gideon Alexander, N. I. Geddes, P. E.L. Clarke, D. G. Fong, M. Couch, Richard Keeler, Paolo Capiluppi, P. Schenk, A. M. Lee, B. Boden, J. Gascon, Georges Azuelos, P. M. Watkins, B. Poli, H. von der Schmitt, H. Takeda, Claude Leroy, G. Eckerlin, Giora Mikenberg, J. P. Pansart, G. J. VanDalen, J. von Krogh, D. R. Rust, N. Wermes, H. M. Fischer, A. Michelini, F. C. Grant, J. A. McKenna, R. Humbert, M. A. Whalley, B. P. O'Neill, J. F. Kral, F. G. Oakham, A. C. Janissen, K. W. Bell, J. W. Gary, R. J. Homer, Ehud Duchovni, R. Shypit, P. Lennert, Max Weber, I. Wingerter, Marcello Mannelli, S. A. Robins, R. F. McGowan, D. E. Klem, P. Ashton, A. Buijs, Andris Skuja, J. C. Hill, H. Ihssen, H. O. Ogren, Dave Robinson, M. F. Turner, Christoph Geich-Gimbel, Kiyotomo Kawagoe, Misao Sasaki, B. C. Shen, Gideon Bella, Tetsuro Mashimo, P. Poffenberger, S. W. O'Neale, Peter R Hobson, S. W. Gensler, J. D. Gillies, Paul Kyberd, F. K. Loebinger, L. A. del Pozo, A. K. Honma, M. M. Deninno, W. G. Scott, J. Kroll, C. Moisan, H. J. Burckhart, O. Schaile, J. P. Walker, R. Yaari, T. Kobayashi, Jacqueline Batley, R. Van Kooten, D. Pitman, F. X. Gentit, Sachio Komamiya, T. Kawamoto, J. E. Conboy, M. H. Lehto, E. Ros, S. Bethke, Michael Dittmar, M. Ogg, R. Kowalewski, P. Teixeira-Dias, R. J. Barlow, W. Gorn, M. W. Redmond, Marco Cuffiani, G. Yekutieli, J. M. Roney, A. Pouladdej, W. J. Collins, Randall Sobie, S. Orito, M. Rosvick, G. A. Bahan, A. Rollnik, G. G. Hanson, A. A. Carter, A. Gaidot, D. Hochman, N. J. Thackray, G. D. Lafferty, M. Kuwano, P. Weber, T. P. Kokott, Rene Brun, M. J. Losty, J. Hart, M. Sproston, S. J. Pawley, C. Y. Chang, P. Berlich, Claus Kleinwort, L. Köpke, T. W. Pritchard, H. Tsukamoto, P. Routenburg, P. Taras, Mitsuaki Nozaki, C. Wahl, S. Schreiber, G. Giacomelli, Y. Yang, T. J. McMahon, A. Dieckmann, J. Schwiening, C. P. Howarth, P. F. Harrison, P. Singh, R. K. Carnegie, H. Przysiezniak, J. E. Pilcher, J. A. Wilson, P. D. Acton, Stephen Lloyd, R. W. L. Jones, E.J. Prebys, A. D. Schaile, W. Schappert, P. Le Du, H. Kreutzmann, B. Panzer-Steindel, M. S. Dixit, Frans Meijers, V. H. Winterer, S. R. Hou, J. M. Lorah, W. Mohr, J. G. Layter, G. Duckeck, R. Ströhmer, D. Strom, S. Sanghera, H. M. Bosch, Wolfram Dietrich Zeuner, D. A. Hinshaw, T. Behnke, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, K. Runge, P. Bock, I. J. Bloodworth, M. Settles, G. W. Wilson, D. Karlen, T. J. Smith, P. Mättig, C. M. Hawkes, M. Cooper, Daniel Lellouch, Takehiko Mori, Erez Etzion, Gareth J. Barker, Shlomit Tarem, S. Rossberg, C. J. Oram, and R. P. Middleton
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Multiplicity (mathematics), Charged particle, Sphericity, Nuclear physics, Log-normal distribution, Gamma distribution, High Energy Physics::Experiment, Parton shower, Engineering (miscellaneous)
Abstract: We present an analysis of multiplicity distributions of charged particles produced inZ 0 hadronic decays. The results are based on the analysis of 82941 events collected within 100 MeV of theZ 0 peak energy with the OPAL detector at LEP. The charged particle multiplicity distribution, corrected for initial-state radiation and for detector acceptance and resolution, was found to have a mean 〈n ch〉=21.40±0.02(stat.)±0.43(syst.) and a dispersionD=6.49±0.02(stat.)±0.20(syst.). The shape is well described by the Lognormal and Gamma distributions. A negative binomial parameterisation was found to describe the shape of the multiplicity distribution less well. A comparison with results obtained at lower energies confirms the validity of KNO(-G) scaling up to LEP energies. A separate analysis of events with low sphericity, typically associated with two-jet final states, shows the presence of features expected for models based on a stochastic production mechanism for particles. In all cases, the features observed in the data are well described by the Lund parton shower model JETSET.
Published: 1992

41. A measurement of strange baryon production in hadronic Z0 decays

Author: P. Paschievici, D. Karlen, A. Dieckmann, R. Mir, G. P. Siroli, A. Astbury, R. Van Kooten, C. H. Shepherd-Themistocleous, M. Hansroul, T. W. Pritchard, A. Wagner, John Hill, Silvia Arcelli, B. Boden, D. Menszner, T. Mouthuy, Gideon Bella, G. Vasseur, S. De Jong, J. C. Clayton, H. J. Burckhart, Jacqueline Batley, C. Geich-Gimbel, S. Rossberg, D. J. Miller, R. K. Carnegie, P. S. Wells, P. E.L. Clarke, Terry Richard Wyatt, F. G. Oakham, G. T. Zorn, T. Hilse, L. Levinson, R. J. Homer, Kiyotomo Kawagoe, A. Beck, H. G. Evans, John Hobbs, Tohru Takeshita, M. Fincke-Keeler, M. J. Oreglia, F. C. Grant, T. Wlodek, M. A. Whalley, A. M. Rossi, T. Tsukamoto, P. Schenk, M. J. Goodrick, N. Tesch, A. K. Honma, F. S. Merritt, R. Humbert, C. J. Virtue, Sachio Komamiya, W. Mohr, A. Buijs, D. M. Strom, G. N. Patrick, J. Mildenberger, C. Schwick, Richard Keeler, D. Hochman, J. P. Martin, P. Routenburg, O. Ganel, E. Ros, J. P. Walker, K. Runge, M. J. Losty, A. C. Janissen, C. J. Oram, U. Binder, J. M. Roney, J. R. Carter, A. Simon, M. Cooper, A. Rollnik, P. Singh, J. F. Kral, G. Beaudoin, J. A. McKenna, N. Wermes, P. Pfister, B. Poli, R. M. Brown, P. W. Jeffreys, J. Hart, J. Becker, K. J. Anderson, P. Weber, A. J. Martin, Carla Sbarra, X. C. Lou, A. A. Carter, T. P. Kokott, K. Stephens, R. F. McGowan, A. Yeaman, G. E. Richards, C. K. Hargrove, T. Behnke, Misao Sasaki, E. Heflin, J. P. Pansart, A. Michelini, D. A. Hinshaw, C. Markus, Marco Cuffiani, H. O. Ogren, D. G. Charlton, D. L. Wagner, D. Lellouch, C. Y. Chang, I. J. Bloodworth, C. Moisan, P. Berlich, B. C. Shen, G. Tysarczyk-Niemeyer, P. M. Watkins, P. Igo-Kemenes, H. Deng, Harold Nguyen, H. Ihssen, P. Bock, V. Gibson, Mitsuaki Nozaki, R. E. Hughes-Jones, J. G. Layter, A. Gaidot, James D Gillies, S. Wotton, Stefan Kluth, D. J.P. Dumas, R. Kowalewski, J. Kroll, P. Le Du, John Baines, S. Schreiber, S. Bethke, J. Schwiening, B. W. Kennedy, Tara Shears, F. X. Gentit, N. I. Geddes, V. H. Winterer, J. E. Conboy, Richard J Hemingway, B. Panzer-Steindel, M. Settles, G. Duckeck, M. Coupland, P. D. Acton, M. Morii, T. Kawamoto, S. W. O'Neale, Peter R Hobson, H. Mes, O. Runolfsson, P. Lennert, U. Maur, M. Foucher, R. J. Barlow, C. Jui, D. Pitman, Horst Breuker, P. M. Hattersley, P. Poffenberger, S. Orito, C. Wahl, E. do Couto e Silva, P. Mättig, D. R. Ward, P. Teixeira-Dias, M. F. Turner, G. A. Snow, C. P. Ward, G. W. Wilson, M. Hauschild, I. P. Duerdoth, F. Lamarche, H. M. Bosch, D. C. Imrie, C. Leroy, J. Steuerer, G. G. Hanson, G. Alexander, S. Bougerolle, J. Hagemann, H. Przysiezniak, E. Etzion, B. Lorazo, G. Quast, P. Leblanc, G. Giacomelli, J. Goldberg, Wolfram Dietrich Zeuner, E.J. Prebys, R. Ströhmer, Claudio Grandi, T. J. Smith, W. J. Collins, S. Dado, N. K. Watson, F. K. Loebinger, G. D. Lafferty, D. Axen, Frans Meijers, J. M. Lorah, A. Jawahery, B. Nellen, D. E. Plane, C. M. Hawkes, Peter Sherwood, W. R. Gibson, Stephen Hillier, G. M. Dallavalle, R. W. Springer, A. M. Lee, Takehiko Mori, J. R. McNutt, K. W. Bell, R. P. Middleton, M. Weber, J. Ludwig, C. P. Howarth, M. W. Redmond, A. Pouladdej, J. Gascon, Alan Watson, P. G. Estabrooks, J. E. Pilcher, G. Mikenberg, G. Maringer, S. Barnett, R. Yaari, S. Tarem, O. Biebel, M. Jimack, N. J. Thackray, John Allison, A. D. Schaile, P. Jovanovic, P. A. Elcombe, R. G. Kellogg, Austin Ball, W. Schappert, F. Odorici, Stefano Marcellini, Alessandro Montanari, James Letts, D. L. Rees, G. J. VanDalen, N. Paz-Jaoshvili, M. Kuwano, G. Transtromer, W. G. Scott, P. F. Harrison, Stephen Lloyd, M. Tecchio, M. Yurko, R. Shypit, S. W. Gensler, T. Kobayashi, D. G. Fong, H. von der Schmitt, Phillip Allport, R. Sobie, H. Jeremie, J. W. Gary, Marcello Mannelli, J. E. Duboscq, M. Jobes, P. Kyberd, Paolo Capiluppi, P. Scharff-Hansen, A. M. Smith, Andris Skuja, Tetsuro Mashimo, W. Gorn, G. Yekutieli, M. Rosvick, G. A. Bahan, R. W.L. Jones, J. von Krogh, Dave Robinson, L. A. del Pozo, Michael Dittmar, H. M. Fischer, T. J. McMahon, O. Schaile, M. H. Lehto, E. Duchovni, J. A. Wilson, S. Levegrün, L. Köpke, I. Cohen, M. S. Dixit, J. Banks, G. Azuelos, N. J. Tresilian, S. Weisz, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, D. R. Rust, M. Sproston, and P. Taras
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Octet, High Energy Physics::Lattice, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, OPAL detector, Baryon, Nuclear physics, Momentum, Diquark, QCD predictions, High Energy Physics::Experiment, Strange baryons, Particle Physics - Experiment, Spin-½
Abstract: The production of the octet and decuplet baryons Λ, Ξ − , Σ (1385) ± , Ξ(1530) 0 and Ω − and the corresponding antibaryons has been measured in a sample of 485 000 hadronic Z 0 decays. Results on differential and integrated cross sections are presented. The differential cross section of Λ baryons is found to be softer than the one predicted by the Jetset and Herwig Monte Carlo generators. The measured decuplet yields are found to disagree with the simple diquark picture where only one tuning parameter for spin 1 diquarks is used. Comparisons of the momentum spectra for Λ and Ξ − with the predictions of an analytical QCD formula are also presented.
Published: 1992

42. A study of two-particle momentum correlations in hadronic Z0 decays

Author: M. Jimack, P. Igo-Kemenes, G. Maringer, Shlomo Dado, John Allison, H. Jeremie, D. J. Miller, F. Lamarche, R. J. Hemingway, D. E. Klem, Michael Dittmar, G. Yekutieli, P. S. Wells, A. A. Carter, R. E. Hughes-Jones, U. Maur, Terry Richard Wyatt, I. J. Bloodworth, X. C. Lou, R. G. Kellogg, P. Jovanovic, Horst Breuker, Erez Etzion, H. Mes, M. Coupland, Austin Ball, D. Menszner, F. C. Grant, P. G. Estabrooks, D. R. Rust, R. Mir, I. P. Duerdoth, M. A. Whalley, Stefano Marcellini, Gareth J. Barker, M. Settles, B. C. Shen, K. J. Anderson, Gideon Bella, Giora Mikenberg, Shlomit Tarem, P. E.L. Clarke, H. Oh, E. do Couto e Silva, Alessandro Montanari, James Letts, W. J. Collins, K. Stephens, J. Steuerer, A. K. Honma, P. Lennert, H. J. Burckhart, Randall Sobie, G. D. Lafferty, S. Rossberg, W. G. Scott, A. Buijs, C. Y. Chang, Jacqueline Batley, C. J. Oram, P. M. Watkins, H. O. Ogren, J. R. McNutt, M. Yurko, P. M. Hattersley, W. R. Gibson, P. Taras, Christoph Geich-Gimbel, T. W. Pritchard, G. W. Wilson, R. P. Middleton, N. I. Geddes, R. Kowalewski, J. Mildenberger, Harold Nguyen, D. Karlen, M. Hauschild, Glenn Patrick, P. W. Jeffreys, A. M. Lee, E. Ros, M. J. Oreglia, P. Paschievici, Kiyotomo Kawagoe, M. Hansroul, H. Takeda, M. M. Deninno, J. Goldberg, B. Boden, D. Axen, M. J. Losty, B. Nellen, F. G. Oakham, G. A. Snow, C. P. Ward, Silvia Arcelli, A. Jawahery, J. Kroll, B. Poli, N. Paz-Jaoshvili, P. Leblanc, J. M. Roney, Paul Kyberd, F. K. Loebinger, A. Beck, P. F. Harrison, T. J. Smith, J. Hart, F. X. Gentit, E. Heflin, G. Tysarczyk-Niemeyer, Richard Keeler, R. Yaari, J. E. Conboy, P. Weber, M. F. Turner, S. Bethke, A. D. Schaile, V. Gibson, Peter Sherwood, J. R. Carter, P. Poffenberger, G. Quast, M. Ogg, P. D. Acton, Stephen Lloyd, M. W. Redmond, Marco Cuffiani, H. G. Evans, J. Banks, J. P. Pansart, P. Mättig, R. M. Brown, Lorne Levinson, J. D. Gillies, A. Rollnik, A. Simon, D. G. Fong, Otmar Biebel, G. E. Richards, M. J. Goodrick, I. Cohen, N. J. Tresilian, J. G. Layter, John Baines, N. Wermes, A. Pouladdej, R. W. Springer, Alexander Wagner, Tohru Takeshita, V. H. Winterer, T. Mouthuy, S. Weisz, R. D. Heuer, D. G. Charlton, D. L. Wagner, J. Gascon, C. M. Hawkes, H. von der Schmitt, M. Cooper, P. Singh, Claude Leroy, B. W. Kennedy, Fabrizio Fabbri, M. Couch, Ehud Duchovni, R. Shypit, Daniel Lellouch, J. Hagemann, D. Van den plas, J. Ludwig, R. J. Barlow, D. C. Imrie, K. Runge, P. Bock, Takehiko Mori, S. R. Hou, C. Wahl, A. Astbury, T. P. Kokott, Rene Brun, Carla Sbarra, F. S. Merritt, H. Ihssen, R. J. Homer, R. Van Kooten, Georges Azuelos, D. Pitman, R. W. L. Jones, D. R. Ward, R. Humbert, M. H. Lehto, G. Transtromer, C. P. Howarth, S. W. Gensler, J. F. Kral, G. P. Siroli, K. W. Bell, P. Le Du, D. A. Hinshaw, Christoph Schwick, S. Wotton, T. Kobayashi, C. J. Virtue, Max Weber, C. Fukunaga, B. Panzer-Steindel, O. Ganel, J. E. Pilcher, S. Bougerolle, John Hobbs, Misao Sasaki, J. A. McKenna, A. M. Rossi, F. Odorici, T. Tsukamoto, T. Behnke, Phillip Allport, S. Sanghera, S. Levegrün, H. M. Fischer, R. F. McGowan, A. J. Martin, A. Michelini, A. C. Janissen, J. W. Gary, C. Moisan, J. P. Walker, G. Duckeck, R. Ströhmer, S. A. Robins, O. Runolfsson, D. Strom, P. Teixeira-Dias, D. E. Plane, G. T. Zorn, Marcello Mannelli, J. E. Duboscq, Stephen Hillier, P. Berlich, L. Köpke, H. M. Bosch, Wolfram Dietrich Zeuner, G. M. Dallavalle, K. Riles, Andris Skuja, J. P. Martin, T. Kawamoto, Gideon Alexander, Paolo Capiluppi, P. Schenk, S. Barnett, Alan Watson, D. J.P. Dumas, D. Hochman, N. J. Thackray, John Hill, Tetsuro Mashimo, C. K. Hargrove, S. De Jong, S. Orito, Claudio Grandi, M. Rosvick, W. Gorn, Margret Fincke-Keeler, G. A. Bahan, M. Jobes, U. Binder, P. Scharff-Hansen, H. Przysiezniak, P. Pfister, G. G. Hanson, A. M. Smith, G. Vasseur, B. Lorazo, G. Giacomelli, N. K. Watson, E.J. Prebys, M. S. Dixit, S. Komamiya, Frans Meijers, S. W. O'Neale, Peter R Hobson, J. M. Lorah, W. Mohr, A. Gaidot, M. Kuwano, T. Wlodek, M. Sproston, P. Routenburg, N. Tesch, A. Dieckmann, P. A. Elcombe, D. L. Rees, J. Becker, G. J. VanDalen, S. Schreiber, T. J. McMahon, J. Schwiening, R. K. Carnegie, J. A. Wilson, W. Schappert, J. von Krogh, Dave Robinson, L. A. del Pozo, and G. Beaudoin
Subjects: Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Logarithm, High Energy Physics::Phenomenology, Monte Carlo method, Hadron, String (physics), Hadronization, Nuclear physics, Momentum, High Energy Physics::Experiment, Parton shower, Particle Physics - Experiment
Abstract: We report on a measurement of two-particle momentum correlations in hadronic decays of the Z 0 at LEP. These data are compared with recent analytic QCD calculations based on the summation of leading and next-to-leading logarithms, and with QCD Monte Carlo simulations. We find that the analytic calculations show the same general features as the data, but that the overall level of the correlations is not reproduced, suggesting that higher order or hadronization effects are significant. This contrasts with the success of similar QCD calculations in describing single-particle momentum distributions. QCD Monte Carlo models are found to give a reasonable level of correlation, with parton shower models incorporating string hadronization giving the best description of the data.
Published: 1992

43. A measurement of electron production in hadronicZ 0 decays and a determination of $$\Gamma (Z^0 \to b\bar b)$$

Author: A. Simon, Otmar Biebel, D. G. Charlton, D. L. Wagner, M. Couch, M. Hansroul, P. G. Estabrooks, R. K. Keeler, R. Humbert, Gideon Bella, H. J. Burckhart, D. Hochman, N. J. Thackray, J. Goldberg, Jacqueline Batley, A. Gaidot, B. Nellen, R. J. Homer, P. M. Watkins, P. Leblanc, P. E.L. Clarke, M. Kuwano, T. Wlodek, M. Sproston, W. J. Collins, Randall Sobie, T. Kawamoto, G. D. Lafferty, P. Routenburg, H. G. Evans, T. W. Pritchard, A. Dieckmann, T. Mouthuy, I. Wingerter, M. J. Goodrick, I. Cohen, A. Astbury, S. Orito, M. Rosvick, C. Fukunaga, S. Bougerolle, J. Hart, A. D. Schaile, C. Moisan, J. P. Walker, O. Ganel, A. J. Martin, Silvia Arcelli, V. H. Winterer, J. M. Lorah, Sachio Komamiya, P. Igo-Kemenes, G. Maringer, P. Teixeira-Dias, W. Mohr, A. M. Rossi, S. R. Hou, K. Riles, R. Mir, H. Jeremie, H. Oh, T. Tsukamoto, S. Levegrün, D. E. Klem, R. E. Hughes-Jones, U. Maur, J. von Krogh, W. R. Gibson, C. Ho, B. P. O'Neill, E. Ros, A. T. Watson, C. K. Hargrove, R. Yaari, R. Van Kooten, S. Wotton, P. Singh, Y. Yang, Margret Fincke-Keeler, P. Ashton, N. I. Geddes, A. Beck, S. Bethke, Marco Cuffiani, D. Pitman, P. A. Elcombe, E. Heflin, M. J. Oreglia, Dave Robinson, R. M. Brown, M. I. Losty, Lorne Levinson, P. F. Harrison, R. W. L. Jones, B. Boden, L. A. del Pozo, M. F. Turner, H. Mes, B. Poli, M. H. Lehto, P. Poffenberger, P. Pfister, P. D. Acton, Stephen Lloyd, K. Stephens, B. B. Brabson, J. R. McNutt, Horst Breuker, B. W. Kennedy, T. P. Kokott, Rene Brun, D. L. Rees, J. Becker, J. R. Carter, P. Le Du, H. Kreutzmann, B. Panzer-Steindel, D. G. Fong, B. C. Shen, J. Gascon, H. von der Schmitt, Erez Etzion, Phillip Allport, G. J. VanDalen, G. N. Patrick, Michael Dittmar, G. Yekutieli, I. P. Duerdoth, Gareth J. Barker, V. Gibson, G. Quast, Shlomit Tarem, H. M. Fischer, A. Michelini, A. C. Janissen, John Baines, D. E. Plane, S. Rossberg, C. J. Oram, A. K. Honma, A. A. Carter, Stephen Hillier, G. M. Dallavalle, S. A. Robins, R. P. Middleton, D. R. Ward, M. W. Moss, G. Transtromer, W. G. Scott, D. J.P. Dumas, Gideon Alexander, Paolo Capiluppi, P. Schenk, J. W. Gary, P. M. Hattersley, S. J. Pawley, Marcello Mannelli, S. Schreiber, Andris Skuja, C. Wahl, P. Berlich, L. Köpke, T. J. McMahon, C. Y. Chang, D. R. Rust, J. Schwiening, R. K. Carnegie, John Hobbs, N. Wermes, C. P. Howarth, Ehud Duchovni, R. Shypit, S. W. O'Neale, Peter R Hobson, P. Taras, R. Kowalewski, Tetsuro Mashimo, J. A. Wilson, P. Lennert, H. Ihssen, G. Beaudoin, W. Schappert, S. W. Gensler, E. do Conto el Silva, T. Kobayashi, W. Gorn, Shlomo Dado, J. E. Pilcher, H. Takeda, F. Odirici, J. Banks, S. Weisz, R. D. Heuer, N. K. Watson, Fabrizio Fabbri, D. Van den plas, F. G. Oakham, G. A. Bahan, M. Jobes, U. Binder, Claude Leroy, P. Scharff-Hansen, W. J. Larson, D. C. Imrie, M. Hauschild, F. Lamarche, G. P. Siroli, R. J. Hemingway, J. P. Pansart, X. C. Lou, P. Paschievici, A. M. Smith, G. Vasseur, B. Lorazo, P. Jovanovic, Austin Ball, Tohru Takeshita, D. Menszner, Alessandro Montanari, Giora Mikenberg, Kiyotomo Kawagoe, Georges Azuelos, J. F. Kral, K. J. Anderson, K. W. Bell, J. D. Gillies, P. S. Wells, C. J. Virtue, R. J. Barlow, Max Weber, Terry Richard Wyatt, J. M. Roney, P. Weber, D. J. Miller, J. C. Hill, Misao Sasaki, O. Schaile, M. Coupland, F. C. Grant, M. A. Whalley, N. C. Wood, A. Buijs, G. A. Snow, C. P. Ward, G. Duckeck, R. Ströhmer, D. Strom, G. T. Zorn, H. M. Bosch, Wolfram Dietrich Zeuner, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, K. Runge, P. Bock, C. M. Hawkes, M. Cooper, Daniel Lellouch, D. A. Hinshaw, T. Behnke, Takehiko Mori, M. Yurko, P. W. Jeffreys, A. M. Lee, T. J. Smith, O. Runolfsson, P. Mättig, Claudio Grandi, I. J. Bloodworth, M. Settles, H. Przysiezniak, G. W. Wilson, D. Karlen, F. S. Merritt, J. A. McKenna, R. F. McGowan, H. O. Ogren, Christoph Geich-Gimbel, M. M. Deninno, J. Kroll, F. X. Gentit, J. E. Conboy, M. Ogg, J. Mildenberger, Harold Nguyen, A. Pouladdej, Paul Kyberd, F. K. Loebinger, M. W. Redmond, A. Rollnik, M. Jimack, John Allison, R. G. Kellogg, Stefano Marcellini, James Letts, G. G. Hanson, G. Giacomelli, E.J. Prebys, M. S. Dixit, Frans Meijers, J. G. Layter, S. Sanghera, J. P. Martin, S. De Jong, and P. Debu
Subjects: Physics, Quark, Semileptonic decay, Particle physics, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Electron, Nuclear physics, Transverse plane, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), Production rate
Abstract: The production rate of electrons with momentump>4 GeV/c and large momentum transverse to the jet containing the electron has been measured in 136000 hadronic decays of theZ 0 recorded with the OPAL detector at LEP in 1990. The dominant source of these electrons is the semileptonic decay of hadrons containingb quarks. If we assume that the semileptonic branching fraction ofb hadrons produced on theZ 0 resonance is the same as the branching fraction measured at the ϒ(4S) resonance, we determine $$\Gamma _{b\bar b} = 394 \pm 13 \pm 32$$ MeV, where the first error is statistical and the second error is systematic. The sensitivity of the result to this assumption is discussed. We have reduced the dependence of our result on the model ofb hadron semileptonic decay by taking into account the correlation between the model dependence of the branching fractions measured at the ϒ(4S) and of our kinematic acceptance for electrons.
Published: 1992

44. Evidence for b-flavoured baryon production in Z0 decays at LEP

Author: J. Allison, G. Duckeck, R. Ströhmer, D. Strom, G. T. Zorn, G. G. Hanson, A. Astbury, C. Y. Chang, M. Yurko, P. W. Jeffreys, F. S. Merritt, B. C. Shen, H. M. Bosch, Wolfram Dietrich Zeuner, H. M. Fischer, J. Hart, P. Taras, O. Ganel, D. C. Imrie, A. M. Lee, Margret Fincke-Keeler, A. K. Honma, W. G. Scott, J. von Krogh, A. J. Martin, J. A. McKenna, P. G. Estabrooks, R. K. Keeler, A. Michelini, A. C. Janissen, G. Giacomelli, R. F. McGowan, R. Kowalewski, H. O. Ogren, Christoph Geich-Gimbel, E.J. Prebys, M. M. Deninno, J. Kroll, F. X. Gentit, J. E. Conboy, M. Ogg, P. Ashton, A. Pouladdej, K. Riles, P. Pfister, G. Beaudoin, G. P. Siroli, Dave Robinson, L. A. del Pozo, Y. Yang, R. Van Kooten, M. S. Dixit, Frans Meijers, R. Mir, S. A. Robins, D. Pitman, C. K. Hargrove, P. M. Watkins, H. Mes, H. Oh, P. F. Harrison, M. J. Losty, I. P. Duerdoth, M. H. Lehto, J. M. Lorah, Shlomo Dado, P. D. Acton, Stephen Lloyd, D. A. Hinshaw, Michael Dittmar, P. Igo-Kemenes, G. Maringer, D. E. Plane, W. Mohr, G. Yekutieli, J. G. Layter, B. B. Brabson, N. Wermes, D. G. Fong, Ehud Duchovni, M. F. Turner, H. Jeremie, M. Hansroul, P. Poffenberger, T. Mouthuy, Stephen Hillier, M. J. Oreglia, X. C. Lou, G. M. Dallavalle, K. Stephens, Paul Kyberd, F. K. Loebinger, J. R. McNutt, Kiyotomo Kawagoe, R. Shypit, T. Behnke, A. A. Carter, R. E. Hughes-Jones, U. Maur, Giora Mikenberg, Erez Etzion, S. Sanghera, J. Gascon, I. Wingerter, R. J. Homer, Tohru Takeshita, H. von der Schmitt, S. J. Pawley, P. Berlich, M. W. Redmond, J. M. Roney, H. Ihssen, D. J.P. Dumas, O. Schaile, John Hobbs, D. Axen, L. Köpke, P. Singh, Silvia Arcelli, A. Gaidot, Georges Azuelos, E. do Couto e Silva, S. W. Gensler, J. R. Carter, G. N. Patrick, A. Simon, Otmar Biebel, C. Moisan, J. P. Walker, M. Kuwano, T. Wlodek, P. Weber, M. Sproston, A. M. Rossi, J. P. Martin, P. Teixeira-Dias, S. Schreiber, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, T. J. McMahon, T. Kobayashi, D. E. Klen, Gareth J. Barker, D. G. Charlton, D. L. Wagner, M. Couch, T. Tsukamoto, S. Levegrün, V. Gibson, R. W. L. Jones, G. Quast, R. W. Springer, Alexander Wagner, Claude Leroy, A. Rollnik, J. F. Kral, P. Routenburg, K. W. Bell, J. Hagemann, J. Ludwig, K. Runge, A. Dieckmann, P. Bock, J. W. Gary, P. E.L. Clarke, J. P. Pansart, J. Banks, Max Weber, J. Schwiening, R. K. Carnegie, Shlomit Tarem, R. Humbert, G. A. Snow, C. P. Ward, S. De Jong, J. C. Hill, S. Weisz, J. A. Wilson, N. I. Geddes, R. D. Heuer, S. Bougerolle, F. Odorici, J. R. McMahon, Misao Sasaki, Fabrizio Fabbri, D. J. Miller, D. Van den plas, W. Schappert, B. Boden, T. Kawamoto, P. Debu, B. Poli, Horst Breuker, Phillip Allport, P. Le Du, H. Kreutzmann, B. Panzer-Steindel, John Baines, Marcello Mannelli, D. R. Rust, S. Orito, M. Rosvick, P. S. Wells, O. Runolfsson, J. Mildenberger, Harold Nguyen, M. Jobes, U. Binder, C. J. Virtue, S. Rossberg, G. D. Lafferty, C. J. Oram, P. Lennert, Gideon Alexander, Paolo Capiluppi, P. Schenk, W. R. Gibson, C. Ho, M. Coupland, Gideon Bella, H. J. Burckhart, P. Scharff-Hansen, Claudio Grandi, C. Wahl, D. R. Ward, R. Yaari, H. Takeda, A. Beck, G. Transtromer, E. Heflin, S. Bethke, W. J. Larson, R. M. Brown, Marco Cuffiani, Lorne Levinson, R. P. Middleton, M. W. Moss, Jacqueline Batley, F. C. Grant, M. Jimack, B. W. Kennedy, M. A. Whalley, K. J. Anderson, T. R. Wyatt, F. G. Oakham, P. M. Hattersley, R. J. Barlow, H. Przysiezniak, C. P. Howarth, R. G. Kellogg, B. P. O'Neill, S. Wotton, A. M. Smith, Stefano Marcellini, James Letts, G. Vasseur, J. Goldberg, A. Buijs, J. E. Pilcher, B. Lorazo, B. Nellen, P. Leblanc, Andris Skuja, I. J. Bloodworth, H. G. Evans, M. J. Goodrick, I. Cohen, Tetsuro Mashimo, M. Settles, D. Hochman, N. J. Thackray, M. Hauschild, A. D. Schaile, P. Paschievici, N. K. Watson, G. W. Wilson, D. Karlen, J. D. Gillies, G. A. Bahan, V. H. Winterer, T. J. Smith, P. Mättig, S. R. Hou, C. M. Hawkes, M. Cooper, Daniel Lellouch, N. C. Wood, Takehiko Mori, W. Corn, S. W. O'Neale, Peter R Hobson, Sachio Komamiya, E. Ros, A. T. Watson, C. Fukunaga, T. P. Kokott, Rene Brun, F. Lamarche, R. J. Hemingway, P. Jovanovic, Austin Ball, D. Menszner, Alessandro Montanari, W. J. Collins, Randall Sobie, T. W. Pritchard, P. A. Elcombe, D. L. Rees, J. Becker, and G. J. VanDalen
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Branching fraction, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Electron, Nuclear physics, Baryon, High Energy Physics::Experiment, Particle Physics - Experiment, Boson
Abstract: We observe evidence for the production of b-flavoured baryons in decays of the Z 0 boson with the OPAL detector at LEP. We find 68 Λl − , Λ l + candidates in 458 583 hadronic Z 0 decays. We interpret this as a signal of 55 ± 9 +0.3 −3.1 events from the semi-leptonic decays of b baryons. Assuming weakly decaying b baryons produced in Z 0 decays are mostly Λ b particles, we measure the product branching ratio (Γ b b /Γ had ) f ( b →Λ b ) B (Λ b →Λl − v X ) , averaged over the electron and muon channels, to be (6.2±1.0±1.5)×10 −4 .
Published: 1992

45. Test of CP-invariance in e+e−→Z0→τ+τ− and a limit on the weak dipole moment of the τ lepton

Author: D. J. Miller, B. B. Brabson, C. M. Hawkes, M. Cooper, Silvia Arcelli, Daniel Lellouch, Takehiko Mori, D. G. Fong, J. Gascon, Gideon Bella, H. von der Schmitt, H. J. Burckhart, Jacqueline Batley, P. S. Wells, C. J. Virtue, R. Mir, H. Oh, D. Axen, A. Jawahery, Terry Richard Wyatt, G. Beaudoin, T. Mouthuy, P. Singh, R. W. L. Jones, P. Le Du, H. Kreutzmann, B. Panzer-Steindel, M. Coupland, N. K. Watson, B. P. O'Neill, R. Van Kooten, P. E.L. Clarke, P. G. Estabrooks, R. K. Keeler, M. Hansroul, G. Tysarczyk-Niemeyer, J. W. Gary, F. C. Grant, M. A. Whalley, D. Pitman, M. H. Lehto, S. Wotton, P. M. Watkins, Marcello Mannelli, Shlomo Dado, Sachio Komamiya, M. Yurko, E. Ros, A. T. Watson, P. W. Jeffreys, Peter Sherwood, M. J. Oreglia, Phillip Allport, M. Jimack, John Allison, A. Buijs, B. C. Shen, R. W. Springer, Alexander Wagner, P. Igo-Kemenes, G. Maringer, R. J. Homer, I. Wingerter, M. W. Moss, T. P. Kokott, Rene Brun, T. J. Smith, H. O. Ogren, Christoph Geich-Gimbel, U. Biebel, A. M. Rossi, H. Jeremie, Andris Skuja, X. C. Lou, A. M. Lee, P. Mättig, J. Hagemann, S. J. Pawley, R. E. Hughes-Jones, U. Maur, J. Ludwig, A. K. Honma, A. Astbury, M. M. Deninno, K. Runge, P. Bock, O. Ganel, P. Berlich, L. Köpke, Tetsuro Mashimo, T. Tsukamoto, S. Levegrün, Giora Mikenberg, J. Kroll, J. M. Lorah, F. Odorici, R. G. Kellogg, A. J. Martin, W. G. Scott, E. do Couto e Silva, K. Riles, P. M. Hattersley, W. Mohr, I. J. Bloodworth, F. X. Gentit, H. M. Fischer, C. Moisan, J. R. Carter, D. C. Imrie, G. N. Patrick, J. P. Walker, S. Bougerolle, J. E. Conboy, M. Ogg, A. Michelini, M. Settles, C. Fukunaga, A. C. Janissen, R. Kowalewski, Stefano Marcellini, A. Pouladdej, J. Banks, R. Yaari, James Letts, S. Weisz, S. W. O'Neale, Peter R Hobson, P. Teixeira-Dias, F. Lamarche, A. Simon, S. Bethke, F. S. Merritt, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, Marco Cuffiani, W. Gorn, Horst Breuker, G. P. Siroli, Erez Etzion, G. W. Wilson, Gareth J. Barker, G. A. Bahan, D. Karlen, D. R. Rust, M. Jobes, D. G. Charlton, D. L. Wagner, U. Binder, S. A. Robins, M. J. Losty, G. A. Snow, C. P. Ward, R. J. Hemingway, Claude Leroy, J. Mildenberger, C. Wahl, Harold Nguyen, Gideon Alexander, P. Lennert, J. P. Pansart, D. A. Hinshaw, Shlomit Tarem, A. Gaidot, J. A. McKenna, M. Kuwano, T. Wlodek, M. Couch, P. Scharff-Hansen, M. Sproston, W. J. Larson, R. F. McGowan, R. Humbert, Paolo Capiluppi, P. Schenk, H. Mes, I. P. Duerdoth, Kiyotomo Kawagoe, A. M. Smith, A. Dieckmann, John Hobbs, T. Behnke, Margret Fincke-Keeler, C. P. Howarth, G. Vasseur, B. Lorazo, S. Rossberg, W. R. Gibson, P. Routenberg, C. J. Oram, N. I. Geddes, P. Jovanovic, Tohru Takeshita, Paul Kyberd, F. K. Loebinger, J. M. Roney, Austin Ball, N. Wermes, P. A. Elcombe, R. P. Middleton, W. J. Collins, T. Kawamoto, C. K. Hangrove, Georges Azuelos, J. E. Pilcher, G. Duckeck, R. Ströhmer, B. Boden, C. Ho, M. W. Redmond, B. Poli, J. Goldberg, D. Strom, P. Weber, G. T. Zorn, Randall Sobie, G. D. Lafferty, A. Rollnik, D. Menszner, D. L. Rees, J. Becker, J. F. Kral, B. Nellen, Claudio Grandi, K. W. Bell, S. Orito, H. M. Bosch, Wolfram Dietrich Zeuner, Max Weber, M. Rosvick, P. Leblanc, G. J. VanDalen, J. C. Hill, Misao Sasaki, A. Beck, H. G. Evans, M. J. Goodrick, T. W. Pritchard, I. Cohen, E. Heflin, Ehud Duchovni, R. Shypit, R. M. Brown, Alessandro Montanari, Lorne Levinson, A. D. Schaile, B. W. Kennedy, V. H. Winterer, H. Ihssen, O. Runolfsson, J. D. Gillies, O. Schaile, S. R. Hou, D. E. Plane, R. J. Barlow, Stephen Hillier, G. M. Dallavalle, S. W. Gensler, M. Hauschild, D. J.P. Dumas, T. Kobayashi, P. Paschievici, H. Takeda, F. G. Oakham, J. Hart, J. von Krogh, P. Ashton, Dave Robinson, L. A. del Pozo, S. Schreiber, T. J. McMahon, Y. Yang, J. Schwiening, R. K. Carnegie, P. F. Harrison, J. A. Wilson, P. D. Acton, Stephen Lloyd, W. Schappert, Michael Dittmar, H. Przysiezniak, G. Yekutieli, A. A. Carter, P. Pfister, K. J. Anderson, C. Y. Chang, P. Taras, D. E. Klem, M. F. Turner, P. Poffenberger, D. Hochman, N. J. Thackray, K. Stephens, J. R. McNutt, V. Gibson, G. Quast, John Baines, D. R. Ward, G. Transtromer, G. G. Hanson, G. Giacomelli, E.J. Prebys, M. S. Dixit, Frans Meijers, J. P. Martin, S. De Jong, N. C. Wood, P. Debu, J. G. Layter, and S. Sanghera
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Dipole, Neutral current, Electron–positron annihilation, High Energy Physics::Phenomenology, Moment (physics), High Energy Physics::Experiment, Observable, Expectation value, Signature (topology), Lepton
Abstract: Using a sample of 5558 Z 0 → τ + τ − decays produced at LEP a direct test of CP -invariance in the neutral current reaction e + e − → τ + τ − is performed. Samples of events where eachy τ decays into a single particle have been isolated for the construction of CP -odd observables. Three different event classes are considered: lepton-lepton, lepton-hadron, and hadron-hadron. No evidence for a non-zero expectation value of the considered CP -observables and hence for CP -violation is observed. Quantitatively, we deduce from this null result an estimate on the weak dipole moment d τ (m 2 Z = (−4.5 ± 5.3 ± 1.4) × 10 −17 e cm for the lepton-lepton signature and d τ (m 2 Z = (1.4 ± 3.7 ± 1.3) × 10 −17 e cm for the hadron-hadron signature. Combining these results we place a limit with 95% confidence of | d τ |⩽7.0 × 10 −17 e cm.
Published: 1992

46. A global determination of $$\alpha _s (M_{Z^0 } )$$ at LEP

Author: John Hart, H. Mes, H. O. Ogren, Christoph Geich-Gimbel, R. Mir, H. Oh, Tohru Takeshita, I. P. Duerdoth, G. G. Hanson, M. W. Moss, Silvia Arcelli, D. Hochman, N. J. Thackray, Horst Breuker, M. M. Deninno, P. M. Hattersley, J. M. Lorah, J. Kroll, F. X. Gentit, G. Giacomelli, Georges Azuelos, W. Mohr, John Hobbs, J. E. Conboy, M. Ogg, H. Takeda, W. R. Gibson, F. G. Oakham, E.J. Prebys, N. Wermes, R. Van Kooten, J. F. Kral, K. W. Bell, C. Ho, D. C. Imrie, M. J. Oreglia, P. Igo-Kemenes, A. Pouladdej, G. Maringer, H. Jeremie, R. E. Hughes-Jones, U. Maur, Ehud Duchovni, C. J. Virtue, R. Shypit, M. S. Dixit, V. Gibson, E. do Couto e Silva, Max Weber, D. Pitman, M. H. Lehto, Frans Meijers, J. von Krogh, A. Beck, J. C. Hill, E. Heflin, Misao Sasaki, B. B. Brabson, A. Astbury, T. R. Wyatt, D. G. Fong, G. D. Lafferty, P. Ashton, M. Hauschild, F. Lamarche, G. P. Siroli, R. M. Brown, H. Ihssen, O. Ganel, J. Gascon, H. von der Schmitt, R. J. Barlow, R. J. Hemingway, P. Singh, A. J. Martin, Dave Robinson, P. E.L. Clarke, J. P. Martin, Lorne Levinson, F. S. Merritt, A. D. Schaile, D. Axen, H. Przysiezniak, P. Paschievici, A. Gaidot, M. Kuwano, T. Wlodek, B. C. Shen, M. Sproston, A. Jawahery, S. De Jong, I. J. Bloodworth, G. N. Patrick, L. A. del Pozo, P. S. Wells, S. W. Gensler, B. W. Kennedy, K. Riles, P. Jovanovic, F. Odorici, P. G. Estabrooks, A. K. Honma, J. W. Gary, R. K. Keeler, Kiyotomo Kawagoe, Austin Ball, W. G. Scott, A. Dieckmann, G. Tysarczyk-Niemeyer, V. H. Winterer, T. Kobayashi, S. J. Pawley, M. Yurko, Marcello Mannelli, D. Menszner, R. W. L. Jones, P. W. Jeffreys, P. A. Elcombe, P. Debu, M. Jobes, U. Binder, J. A. McKenna, Peter Sherwood, R. Kowalewski, Michael Dittmar, G. Yekutieli, A. Simon, Otmar Biebel, P. Berlich, C. K. Hargrove, J. M. Roney, P. M. Watkins, S. R. Hou, A. M. Lee, R. W. Springer, Alexander Wagner, S. Bougerolle, P. Scharff-Hansen, D. E. Klem, W. J. Larson, Alessandro Montanari, R. F. McGowan, L. Köpke, M. Coupland, R. Yaari, D. G. Charlton, D. L. Wagner, M. Couch, A. A. Carter, P. Weber, J. Hagemann, P. Le Du, H. Kreutzmann, J. G. Layter, G. Beaudion, B. Panzer-Steindel, J. Ludwig, S. Bethke, D. L. Rees, J. Becker, K. Runge, G. A. Snow, C. P. Ward, K. J. Anderson, P. Bock, I. Wingerter, Marco Cuffiani, R. Humbert, M. J. Losty, J. D. Gillies, M. F. Turner, G. J. VanDalen, C. Fukunaga, A. M. Smith, G. Vasseur, B. Lorazo, O. Schaile, N. C. Wood, F. C. Grant, M. A. Whalley, S. Sanghera, M. Settles, D. R. Rust, Gideon Bella, S. Schreiber, Y. Yang, Andris Skuja, D. J. Miller, D. E. Plane, T. J. McMahon, H. J. Burckhart, Jacqueline Batley, J. Schwiening, J. Allison, P. F. Harrison, T. Kawamoto, Tetsuro Mashimo, Stephen Hillier, N. K. Watson, G. M. Dallavalle, R. K. Carnegie, G. Duckeck, R. Ströhmer, J. A. Wilson, Shlomo Dado, D. Strom, P. D. Acton, Stephen Lloyd, W. Gorn, P. Lennert, S. Orito, G. T. Zorn, W. J. Collins, W. Schappert, M. Rosvick, O. Runolfsson, D. J.P. Dumas, X. C. Lou, G. A. Bahan, Randall Sobie, H. M. Bosch, Wolfram Dietrich Zeuner, A. Buijs, T. W. Pritchard, Sachio Komamiya, Giora Mikenberg, C. Y. Chang, Claudio Grandi, P. Taras, E. Ros, A. T. Watson, D. A. Hinshaw, Gideon Alexander, Paolo Capiluppi, P. Schenk, C. Wahl, T. Behnke, B. P. O'Neill, C. P. Howarth, G. W. Wilson, D. Karlen, J. E. Pilcher, J. Banks, S. Wotton, S. Weisz, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, T. P. Kokott, Rene Brun, P. Poffenberger, T. J. Smith, Claude Leroy, J. P. Pansart, Erez Etzion, P. Mättig, Gareth J. Barker, C. M. Hawkes, M. Cooper, Daniel Lellouch, Takehiko Mori, Shlomit Tarem, S. Rossberg, C. J. Oram, S. W. O'Neale, Peter R Hobson, R. P. Middleton, J. Goldberg, B. Nellen, P. Leblanc, C. Moisan, J. P. Walker, H. G. Evans, P. Teixeira-Dias, M. J. Goodrick, I. Cohen, M. Hansroul, R. J. Homer, Margret Fincke-Keeler, J. Mildenberger, Harold Nguyen, P. Pfister, Paul Kyberd, F. K. Loebinger, M. W. Redmond, A. Rollnik, M. Jimack, P. Routenberg, N. I. Geddes, B. Boden, B. Poli, R. G. Kellogg, P. P. Allport, T. Mouthuy, Stefano Marcellini, K. Stephens, J. R. McNutt, James Letts, A. M. Rossi, G. Quast, T. Tsukamoto, John Baines, S. Levegrün, H. M. Fischer, D. R. Ward, A. Michelini, G. Transtromer, A. C. Janissen, S. A. Robins, and J. R. Carter
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, Hadron, Perturbative QCD, Observable, Parton, Nuclear physics, Renormalization, High Energy Physics::Experiment, Resummation, Engineering (miscellaneous)
Abstract: The value of the strong coupling constant, $$\alpha _s (M_{Z^0 } )$$ , is determined from a study of 15 different observables in hadronicZ 0 and τ decays. The study includes global event shape variables, jet production rates, energy correlations, theZ 0 line shape and decay asymmetries and the hadronic branching fraction of τ-leptons. Differences between the αs values from the different observables can be consistently attributed to unknown higher order contributions to the calculations. These uncertaities may be parametrized by variations of the renormalization scale and of the parton virtuality to which the data are corrected, separately for each observable, resulting in a consistent description of the event shapes, jet rates and energy correlations with the value $$\alpha _s (M_{Z^0 } ) = 0.122_{ - 0.005}^{ + 0.006} $$ in . The error is dominated by the theoretical uncertainties. Application of recent calculations which include the resummation of leading and next-to-leading logarithms to all orders for some observables confirm this result with a reduced sensitivity to renormalization scale variations. TheZ 0 line shapes and τ-lepton branching ratios yield $$\alpha _s (M_{Z^0 } ) = 0.148 \pm 0.021$$ and $$\alpha _s (M_{Z^0 } ) = 0.123_{ - 0.007}^{ + 0.006} $$ , respectively, in . These measurements and their uncertainties are entirely independent of each other and from event shape and jet observables; the good agreement of the resulting αs values thus constitutes an important consistency check of the reliability of perturbative QCD.
Published: 1992

47. The trigger system of the OPAL experiment at LEP

Author: F. K. Loebinger, T. Kobayashi, J. W. Gary, P. Farthouat, D. Scherer, G. Schuler, R. Milborrow, T. W. Pritchard, J. Feyt, K. W. Bell, John Hart, R. W. Springer, O. Schaile, K. Runge, D. Joos, M. Weymann, R. Hammarstroem, H. Gao, D. G. Charlton, R. Humbert, Gunter Quast, A. A. Macbeth, T. Hilse, M. Arignon, P. M. Watkins, R. G. Kellogg, T. Kawamoto, John H. Schwarz, C. J. Virtue, A. P. Wagner, G. W. Wilson, A. Penton, G. Ricth, S. Jaroslawski, M. Bramhall, R. D. Heuer, A. Braun, P. Le Du, J. R. Carter, C. Weber, Michael Dittmar, S. J. Pawley, A. A. Carter, J. D. Gillies, P. Jovanovic, Austin Ball, H. Takeda, J. A. Wilson, C. Greiner, Lorne Levinson, John Hill, Stephen Hillier, Giora Mikenberg, C. M. Roach, M. Webel, and D. R. Ward
Subjects: Physics, Nuclear and High Energy Physics, Wire chamber, Physics::Instrumentation and Detectors, Detector, Dead time, Particle detector, Nuclear physics, Bunches, Logic gate, Redundancy (engineering), Physics::Accelerator Physics, High Energy Physics::Experiment, Detectors and Experimental Techniques, Instrumentation, Electronic circuit
Abstract: A pretrigger system is described for running the OPAL detector at the LEP e + e − collider with more bunches than originally foreseen. A large number of low threshold pretrigger signals are formed by several independent components of the detector, and combined by a custom-built VME-based central pretrigger logic. Flexibility, high efficiency and high redundancy in all physics channels are all achieved with low additional deadtime, without any compromise to the trigger performance.
Published: 1992

48. Measurement of B00 mixing in hadronic Z0 decays

Author: Kiyotomo Kawagoe, O. Ganel, J. Gascon, D. Axen, J. M. Roney, P. Weber, A. Wagner, Andris Skuja, R. P. Middleton, P. Le Du, M. Hauschild, B. Panzer-Steindel, D. E. Plane, Tetsuro Mashimo, J. L. Pinfold, C. Y. Chang, Mitsuaki Nozaki, G. Beaudoin, Stephen Hillier, G. M. Dallavalle, H. Mes, R. Van Kooten, M. H. Lehto, Sachio Komamiya, W. Gorn, Phillip Allport, Tohru Takeshita, P. Poffenberger, A. Astbury, F. K. Loebinger, M. W. Redmond, T. Behnke, R. Mir, H. Oh, R. M. Brown, F. C. Grant, M. A. Whalley, G. J. Barker, G. Yekutieli, D. J.P. Dumas, G. Mikenberg, I. P. Duerdoth, F. S. Merritt, Paolo Capiluppi, G. A. Bahan, G. P. Siroli, J. F. Kral, A. K. Honma, P. R. Hobson, E. Ros, A. T. Watson, G. Vasseur, A. Buijs, M. W. Moss, O. Biebel, P. M. Hattersley, A. Gaidot, N. Wermes, X. C. Lou, E. Etzion, S. J. Pawley, O. Runolfsson, John Hobbs, J. P. Pansart, P. Berlich, Claus Kleinwort, L. Köpke, R. Shypit, D. E. Klem, M. Jobes, U. Binder, G. Alexander, G. Bella, P. E.L. Clarke, R. J. Hemingway, P. Scharff-Hansen, W. J. Larson, C. Ho, C. Geich-Gimbel, Max Weber, M. J. Oreglia, J. Schwiening, P. D. Acton, Claudio Grandi, S. A. Robins, H. Ihssen, N. J. Thackray, K. Stephens, D. A. Hinshaw, H. J. Burckhart, M. Cooper, J. A. McKenna, E. Heflin, J. C. Hill, Misao Sasaki, M. F. Turner, M. Jimack, Jacqueline Batley, J. von Krogh, A. M. Smith, S. W. Gensler, G. Maringer, A. M. Lee, Rene Brun, M. Hansroul, B. W. Kennedy, B. C. Shen, J. M. Lorah, J. Banks, C. Wahl, H. M. Fischer, J. D. Gillies, D. C. Imrie, N. C. Wood, S. Tarem, S. Weisz, B. Lorazo, P. Ashton, Dave Robinson, J. Goldberg, M. Coupland, R. D. Heuer, T. P. Kokott, W. Mohr, C. P. Howarth, J. R. Carter, John Allison, P. Jovanovic, Austin Ball, D. Menszner, R. G. Kellogg, T. J. Smith, L. A. del Pozo, J. E. Pilcher, T. J. McMahon, C. Leroy, Fabrizio Fabbri, R. W.L. Jones, D. Van den plas, V. Gibson, R. J. Homer, M. Rosvick, G. A. Snow, C. P. Ward, P. A. Elcombe, R. K. Carnegie, G. Azuelos, B. B. Brabson, P. Mättig, D. G. Fong, S. Schreiber, Alessandro Montanari, H. von der Schmitt, G. N. Patrick, T. Kobayashi, J. G. Layter, A. A. Carter, B. Poli, Stefano Marcellini, J. A. Wilson, D. Pitman, R. Kowalewski, P. Debu, John Baines, E. Duchovni, D. R. Rust, B. Nellen, M. Sproston, W. Schappert, D. L. Rees, J. Becker, S. Bethke, G. Quast, Marco Cuffiani, C. M. Hawkes, D. G. Charlton, James Letts, M. Couch, P. Schenk, P. Lennert, J. Hart, O. Schaile, P. Taras, J. W. Gary, C. J. Oram, C. Fukunaga, M. J. Losty, A. J. Martin, C. Moisan, Marcello Mannelli, G. J. VanDalen, D. R. Ward, R. Humbert, P. F. Harrison, K. J. Anderson, Takehiko Mori, Michael Dittmar, S. Sanghera, J. Hagemann, P. S. Wells, C. J. Virtue, N. I. Geddes, P. Pfister, A. Michelini, A. C. Janissen, Terry Richard Wyatt, P. W. Jeffreys, A. Jawahery, R. Yaari, M. Fincke-Keeler, R. J. Barlow, G. Tysarczyk-Niemeyer, D. J. Miller, J. Mildenberger, Harold Nguyen, W. R. Gibson, A. Simon, T. W. Pritchard, Y. Yang, T. Kawamoto, Peter Sherwood, F. Odorici, D. Lellouch, M. Kuwano, R. W. Springer, J. Ludwig, P. Routenburg, S. Orito, A. Dieckmann, K. Runge, P. Bock, F. Lamarche, N. K. Watson, I. Cohen, D. Hochman, B. Boden, M. Yurko, G. Eckerlin, S. De Jong, I. J. Bloodworth, J. P. Walker, P. Teixeira-Dias, T. Mouthuy, G. Duckeck, R. Ströhmer, A. Rollnik, L. Levinson, W. J. Collins, G. D. Lafferty, D. Strom, H. Takeda, G. T. Zorn, F. G. Oakham, R. F. McGowan, P. Paschievici, H. M. Bosch, G. W. Wilson, M. Settles, H. O. Ogren, A. M. Rossi, P. Leblanc, Wolfram Dietrich Zeuner, M. M. Deninno, J. Kroll, J. P. Martin, T. Tsukamoto, S. Dado, G. G. Hanson, J. E. Conboy, M. Ogg, H. Kreutzmann, A. Pouladdej, A. D. Schaile, G. Giacomelli, V. H. Winterer, S. W. O'Neale, E.J. Prebys, S. R. Hou, D. Karlen, M. S. Dixit, Frans Meijers, Silvia Arcelli, U. Maur, S. Wotton, M. Weymann, H. E. Stier, P. G. Estabrooks, P. M. Watkins, P. Kyberd, I. Wingerter, S. Rossberg, K. W. Bell, P. Igo-Kemenes, A. Beck, R. E. Hughes-Jones, W. G. Scott, K. Riles, H. Jeremie, P. Singh, C. K. Hargrove, B. Holl, S. Levegrün, I. Zacharov, R. Sobie, Horst Breuker, S. Bougerolle, R. K. Keeler, M. J. Goodrick, G. Transtromer, H. Przysieniak, J. R. McNutt, S. L. Lloyd, B. P. O'Neill, and F. X. Gentit
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Electron, Jet (particle physics), Bottom quark, Nuclear physics, High Energy Physics::Experiment, Mixing (physics), Lepton
Abstract: From a sample of approximately 135 000 hadronic Z0 decays recorded with the OPAL detector, 1 536 events were selected with two lepton candidates, either electrons or muons. A signal for B0 B 0 mixing was observed using the sign of the lepton charge to tag the charge of the b quark in decaying b-flavoured hadrons. A flavour discriminating variable was constructed from the lepton momentum and its component perpendicular to the jet axis. By fitting the fraction of events in which the two lepton charges are of the same sign, as a function of this variable, the average mixing parameter was measured to be χ = 0.145+0.041-0.035 ± 0.018, where the first error is statistical and the second is systematic.
Published: 1992

49. An improved measuremebts of αS (MZ0) using energy correlations with the OPAL detector at LEP

Author: H. M. Fischer, P. A. Elcombe, T. Mouthuy, T. J. McMahon, P. Routenburg, M. Cooper, B. Poli, P. Igo-Kemenes, Sachio Komamiya, A. M. Rossi, P. Debu, T. Tsukamoto, A. Michelini, S. Sanghera, J. Schweining, B. C. Shen, E. Ros, A. T. Watson, I. P. Duerdoth, F. Lamarche, R. Yaari, M. F. Turner, Richard Keeler, P. Jovanovic, D. J.P. Dumas, M. Hansroul, H. Ihssen, Austin Ball, D. L. Rees, W. Schappert, H. O. Ogren, O. Biebel, M. Jimack, John Allison, B. P. O'Neill, A. J. Martin, Rene Brun, Alessandro Montanari, M. Coupland, Gideon Bella, G. Vasseur, R. Mir, A. Astbury, P. Berlich, P. Lennert, R. J. Homer, S. Bougerolle, D. R. Rust, M. W. Moss, M. Sproston, G. J. VanDalen, A. D. Schaile, A. M. Lee, P. Poffenberger, J. Kroll, P. M. Hattersley, K. Stephens, U. Binder, H. Oh, R. G. Kellogg, P. Taras, R. M. Brown, S. W. Gensler, G. Maringer, F. X. Gentit, B. Boden, P. Mättig, E. Etzion, B. B. Brabson, N. C. Wood, W. J. Collins, S. De Jong, J. E. Conboy, T. Kobayashi, H. J. Burckhart, Jacqueline Batley, C. Geich-Gimbel, R. E. Hughes-Jones, G. W. Wilson, D. G. Fong, H. von der Schmitt, D. Menszner, D. Axen, Stefano Marcellini, J. P. Walker, A. C. Janissen, D. Karlen, A. Dieckmann, G. J. Barker, R. K. Carnegie, James Letts, M. Fincke-Keeler, G. D. Lafferty, R. Sobie, G. P. Siroli, Phillip Allport, P. Paschievici, M. Kuwano, P. Teixeira-Dias, A. A. Carter, M. Ogg, Tohru Takeshita, N. K. Watson, P. Singh, R. Shypit, G. Transtromer, G. A. Snow, H. E. Stier, R. Van Kooten, O. Schaile, M. H. Lehto, H. M. Bosch, D. C. Imrie, F. Odorici, V. Gibson, J. L. Pinfold, F. S. Merritt, John Baines, A. Rollnik, F. K. Loebinger, K. W. Bell, C. P. Ward, Kiyotomo Kawagoe, A. Beck, D. E. Plane, W. R. Gibson, Stephen Hillier, M. J. Goodrick, H. Takeda, H. Jeremie, J. W. Gary, H. Kreutzmann, Marcello Mannelli, W. G. Scott, J. Becker, K. J. Anderson, P. S. Wells, P. E.L. Clarke, G. M. Dallavalle, K. Runge, J. P. Martin, T. W. Pritchard, H. Przysiezniak, A. Wagner, J. F. Kral, C. J. Virtue, H. Mes, Terry Richard Wyatt, G. Duckeck, Richard J Hemingway, C. J. Oram, J. M. Roney, O. Runolfsson, M. Jobes, F. G. Oakham, E. Duchovni, P. G. Estabrooks, P. Kyberd, C. K. Hargrove, J. A. McKenna, Paolo Capiluppi, M. W. Redmond, P. Pfister, J. C. Hill, D. R. Ward, F. C. Grant, M. A. Whalley, P. Schenk, P. Scharff-Hansen, S. W. O'Neale, Peter R Hobson, T. P. Kokott, J. Hart, G. Tysarczyk-Niemeyer, Claudio Grandi, C. Ho, W. J. Larson, D. Pitman, Misao Sasaki, R. F. McGowan, A. Pouladdej, Marco Cuffiani, J. M. Lorah, M. M. Dennino, G. Mikenberg, D. Lellouch, C. Y. Chang, S. Rossberg, P. Bock, A. Buijs, S. J. Pawley, E. Heflin, G. G. Hanson, J. P. Pansart, M. J. Oreglia, Y. Yang, N. I. Geddes, R. J. Barlow, G. Alexander, B. Holl, P. Weber, S. Levegrün, P. F. Harrison, Claus Kleinwort, L. Köpke, S. Tarem, A. Gaidot, S. R. Hou, D. J. Miller, R. Humbert, G. N. Patrick, W. Mohr, S. Bethke, P. D. Acton, B. W. Kennedy, M. Hauschild, John Hobbs, S. A. Robins, D. Hochman, C. Fukunaga, I. Zacharov, M. J. Losty, G. Giacomelli, Stephen Lloyd, M. Yurko, J. Mildenberger, E.J. Prebys, Horst Breuker, Mitsuaki Nozaki, P. W. Jeffreys, X. C. Lou, A. M. Smith, C. Wahl, T. Behnke, C. Leroy, M. S. Dixit, B. Lorazo, G. Quast, P. Leblanc, S. Dado, J. Banks, G. Azuelos, Frans Meijers, P. Le Du, S. Weisz, R. D. Heuer, J. R. Carter, B. Panzer-Steindel, Fabrizio Fabbri, D. A. Hinshaw, D. Van den plas, M. Weber, L. Levinson, B. Nellen, J. G. Layter, D. E. Klem, A. K. Honma, D. G. Charlton, O. Ganel, K. Riles, M. Couch, G. Eckerlin, G. Beaudoin, N. J. Thackray, Andris Skuja, Harold Nguyen, J. Ludwig, C. P. Howarth, R. Kowalewski, J. Gascon, J. E. Pilcher, S. Schreiber, T. Kawamoto, S. Orito, V. H. Winterer, Tetsuro Mashimo, P. M. Watkins, W. Gorn, G. Yekutieli, M. Rosvick, G. A. Bahan, I. Wingerter, Silvia Arcelli, S. Wotton, A. Simon, M. Weymann, N. Wermes, A. Jawahery, Peter Sherwood, R. W. Springer, J. R. McNutt, U. Maur, D. Strom, G. T. Zorn, Wolfram Dietrich Zeuner, R. Ströhmer, J. A. Wilson, I. Cohen, Michael Dittmar, R. W.L. Jones, J. von Krogh, P. Ashton, Dave Robinson, L. A. del Pozo, J. Goldberg, T. J. Smith, I. J. Bloodworth, C. Moisan, James D Gillies, M. Settles, J. Hagemann, C. M. Hawkes, Takehiko Mori, and R. P. Middleton
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, media_common.quotation_subject, Electron–positron annihilation, Monte Carlo method, Hadron, Asymmetry, Hadronization, Nuclear physics, Renormalization, Correlation function, High Energy Physics::Experiment, Perturbation theory (quantum mechanics), Particle Physics - Experiment, media_common
Abstract: We report on an improved measurement of the value of the strong coupling constant σs at the Z0 peak, using the asymmetry of the energy-energy correlation function. The analysis, based on second-order perturbation theory and a data sample of about 145000 multihadronic Z0 decays, yields αs(Mz0 = 0.118±0.001(stat.)±0.003(exp.syst.)−0.004+0.0009 (theor. syst.), where the theoretical systematic error accounts for uncertainties due to hadronization, the choice of the renormalization scale and unknown higher-order terms. We adjust the parameters of a second-order matrix element Monte Carlo followed by string hadronization to best describe the energy correlation and other hadronic Z0 decay data. The αs result obtained from this second-order Monte Carlo is found to be unreliable if values of the renormalization scale smaller than about 0.15 Ecm are used in the generator.
Published: 1992

50. Measurement of three-jet distributions sensitive to the gluon spin ine + e − annihilations at $$\sqrt s = 91$$ GeV

Author: Phillip Allport, P. W. Jeffreys, A. M. Lee, B. C. Shen, J. D. Hobbs, H. E. Stier, D. A. Hinshaw, G. G. Hanson, P. Tarras, H. Mes, P. G. Estabrooks, R. K. Keeler, A. Simon, J. D. Gillies, I. P. Duerdoth, G. Giacomelli, Gideon Alexander, H. Przysiezniak, C. Y. Chang, N. C. Wood, E.J. Prebys, Otmar Biebel, D. G. Charlton, W. G. Scott, Paolo Capiluppi, P. Schenk, R. J. Barlow, O. Runolfsson, T. Mouthuy, L. Lessard, F. S. Merritt, Mitsuaki Nozaki, P. M. Watkins, M. Couch, D. J. Miller, Claudio Grandi, R. Humbert, M. S. Dixit, Frans Meijers, R. Kowalewski, Margret Fincke-Keeler, M. Jimack, John Allison, N. Wermes, M. A. Whalley, G. A. Snow, C. P. Ward, J. T.M. Chrin, L. Janissen, C. Milstene, Ehud Duchovni, R. Shypit, M. J. Losty, P. Singh, S. Schreiber, B. B. Brabson, J. G. Layter, A. M. Rossi, D. G. Fong, T. Kawamoto, J. Gascon, Kiyotomo Kawagoe, I. Wingerter, B. P. O'Neill, F. Lamarche, G. Beaudoin, A. Buijs, A. P. Wagner, T. J. McMahon, R. G. Kellogg, P. Pfister, T. Tsukamoto, J. Hagemann, H. Ihssen, S. W. Gensler, R. W. L. Jones, S. Levegrün, H. M. Fischer, S. Orito, John H. Schwarz, H. von der Schmitt, W. R. Gibson, G. Duckeck, R. Mir, R. J. Hemingway, Silvia Arcelli, A. Michelini, J. M. Roney, D. Hochman, N. J. Thackray, T. J. Smith, C. Ho, D. Strom, G. T. Zorn, Stefano Marcellini, R. F. McGowan, T. Kobayashi, H. Oh, Shlomo Dado, S. Sanghera, R. K. Carnegie, K. Stephens, C. Fukunaga, P. Jovanovic, J. Goldberg, J. C. Armitage, P. Mättig, H. O. Ogren, J. A. Wilson, Christoph Geich-Gimbel, P. Igo-Kemenes, G. Maringer, F. Odorici, S. A. Robins, J. R. McNutt, Austin Ball, D. Menszner, Alessandro Montanari, H. M. Bosch, D. C. Imrie, Tohru Takeshita, M. M. Deninno, M. J. Oreglia, W. Schappert, H. Jeremie, P. Le Du, H. Kreutzmann, A. Beck, J. Mildenberger, Harold Nguyen, Marcello Mannelli, M. Jobes, U. Binder, E. Heflin, R. M. Brown, Wolfram Dietrich Zeuner, E. K. U. Gross, A. Gaidot, M. Kuwano, P. Scharff-Hansen, Lorne Levinson, C. M. Hawkes, M. Cooper, Daniel Lellouch, G. P. Siroli, B. Nellen, P. Leblanc, M. J. Goodrick, M. Sproston, B. Panzer-Steindel, R. E. Hughes-Jones, U. Maur, I. Cohen, J. Hart, V. Gibson, Y. Yang, P. F. Harrison, J. L. Pinfold, G. Eckerlin, Michael Dittmar, W. J. Larson, D. Axen, A. Jawahery, John Baines, B. W. Kennedy, Georges Azuelos, G. Tysarczyk-Niemeyer, J. Kroll, O. Schaile, F. X. Gentit, J. E. Conboy, S. W. O'Neale, Peter R Hobson, M. Ogg, M. Hansroul, J. R. Carter, K. W. Bell, G. N. Patrick, G. Yekutieli, Gideon Bella, Stephen Lloyd, J. W. Gary, Takehiko Mori, A. D. Schaile, Peter Sherwood, S. Wotton, H. Takeda, Max Weber, K. J. Anderson, J. C. Hill, R. W. Springer, M. Weymann, A. Pouladdej, H. J. Burckhart, D. E. Klem, A. A. Carter, Misao Sasaki, A. M. Smith, Jacqueline Batley, N. I. Geddes, J. Ludwig, K. Runge, G. Vasseur, P. Routenburg, D. R. Ward, F. G. Oakham, P. Bock, Erez Etzion, M. W. Moss, Paul Kyberd, F. K. Loebinger, B. Lorazo, V. H. Winterer, A. Dieckmann, P. M. Hattersley, S. Bougerolle, Andris Skuja, B. Poli, J. Banks, M. W. Redmond, S. R. Hou, Claude Leroy, Gareth J. Barker, Tetsuro Mashimo, J. P. Martin, R. J. Homer, A. Rollnik, S. De Jong, M. F. Turner, P. Poffenberger, J. P. Pansart, N. K. Watson, J. von Krogh, I. J. Bloodworth, P. A. Elcombe, Shlomit Tarem, C. Wahl, W. J. Collins, Sachio Komamiya, A. T. Watson, S. Weisz, P. Ashton, Dave Robinson, Randall Sobie, G. D. Lafferty, C. P. Howarth, W. Gorn, D. E. Plane, T. P. Kokott, Rene Brun, J. E. Pilcher, M. Settles, G. A. Bahan, Stephen Hillier, R. D. Heuer, C. Moisan, J. P. Walker, C. K. Hargrove, T. W. Pritchard, Fabrizio Fabbri, G. M. Dallavalle, P. Teixeira-Dias, S. Rossberg, P. S. Wells, M. Hauschild, C. J. Oram, D. J.P. Dumas, C. J. Virtue, P. Paschievici, Terry Richard Wyatt, D. Van den plas, G. W. Wilson, D. Karlen, M. Coupland, D. L. Rees, P. Debu, J. Becker, D. R. Rust, R. P. Middleton, G. J. VanDalen, P. Lennert, M. H. Letho, R. Van Kooten, J. M. Lorah, W. Mohr, S. J. Pawley, Claus Kleinwort, L. Köpke, X. C. Lou, P. G. Murphy, Giora Mikenberg, P. E.L. Clarke, T. Behnke, B. Holl, I. Zacharov, Horst Breuker, R. Yaari, S. Bethke, Marco Cuffiani, Gunter Quast, A. Astbury, O. Ganel, A. J. Martin, and K. Riles
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, High Energy Physics::Phenomenology, Scalar (mathematics), Elementary particle, Jet (particle physics), Gluon, Nuclear physics, High Energy Physics::Experiment, Field theory (psychology), Quantum field theory, Engineering (miscellaneous), Spin-½
Abstract: Three-jet variables constructed from multi-hadronic events produced byZ0 decays are compared to theoretical calculations assuming a vector gluon or a hypothetical scalar gluon. The data yield conclusive direct evidence for the former case. The distributions of the reduced energy of the second-most energetic jet and of the cosine of the Ellis-Karliner angle are chosen to demonstrate this effect.
Published: 1991

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

311 results on '"R. Humbert"'

Search Results

Catalog

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources