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1. Geochemical and microbial processes in a deep geothermal well during seven years of production stop and their potential impact on the well performance

Author

Regenspurg, Simona, primary, Blöcher, Guido, additional, Bregnard, Danae, additional, Hehn, Vera, additional, Huenges, Ernst, additional, Junier, Pilar, additional, Kieling, Katrin, additional, Kluge, Christian, additional, Kranz, Stefan, additional, Leins, Alessio, additional, Vieth-Hillebrand, Andrea, additional, Wiersberg, Thomas, additional, and Zimmer, Martin, additional

Published
2024
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2. Assessing textbook outcomes following major liver surgery in association with obesity at a referral academic center

Author

Khajeh, Elias, primary, Fakour, Sanam, additional, Ünal, Umut Kaan, additional, Sabetkish, Nastaran, additional, Leins, Johannes, additional, Ramouz, Ali, additional, Mieth, Markus, additional, Sabagh, Mohammadsadegh, additional, Abbasi Dezfouli, Sepehr, additional, Golriz, Mohammad, additional, W. Büchler, Markus, additional, and Mehrabi, Arianeb, additional

Published
2023
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4. Geochemical and Microbial Processes in a Deep Geothermal Well During Seven Years of Production Stop and Their Potential Impact on the Well Performance

Author

Regenspurg, Simona, primary, Bloecher, Guido, additional, Bregnard, Danae, additional, Hehn, Vera, additional, Huenges, E., additional, Junier, Pilar, additional, Kieling, Katrin, additional, Kluge, Christian, additional, Kranz, Stefan, additional, Leins, Alessio, additional, Vieth-Hillebrand, Andrea, additional, Wiersberg, Thomas, additional, and Zimmer, Martin, additional

Published
2023
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6. Bleach baths for atopic dermatitis

Author

Bakaa, Layla, primary, Pernica, Jeffrey M., additional, Couban, Rachel J., additional, Tackett, Kelly Jo, additional, Burkhart, Craig N., additional, Leins, Liz, additional, Smart, Joanne, additional, Garcia-Romero, Maria Teresa, additional, Elizalde-Jiménez, Itzel Guadalupe, additional, Herd, Michael, additional, Asiniwasis, Rachel Netahe, additional, Boguniewicz, Mark, additional, De Benedetto, Anna, additional, Chen, Lina, additional, Ellison, Kathy, additional, Frazier, Winfred, additional, Greenhawt, Matthew, additional, Huynh, Joey, additional, LeBovidge, Jennifer, additional, Lind, Mary Laura, additional, Lio, Peter, additional, O'Brien, Monica, additional, Ong, Peck Y., additional, Silverberg, Jonathan I., additional, Spergel, Jonathan M., additional, Wang, Julie, additional, Begolka, Wendy Smith, additional, Schneider, Lynda, additional, and Chu, Derek K., additional

Published
2022
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11. Bleach baths for atopic dermatitis

Author

Layla Bakaa, Jeffrey M. Pernica, Rachel J. Couban, Kelly Jo Tackett, Craig N. Burkhart, Liz Leins, Joanne Smart, Maria Teresa Garcia-Romero, Itzel Guadalupe Elizalde-Jiménez, Michael Herd, Rachel Netahe Asiniwasis, Mark Boguniewicz, Anna De Benedetto, Lina Chen, Kathy Ellison, Winfred Frazier, Matthew Greenhawt, Joey Huynh, Jennifer LeBovidge, Mary Laura Lind, Peter Lio, Monica O'Brien, Peck Y. Ong, Jonathan I. Silverberg, Jonathan M. Spergel, Julie Wang, Wendy Smith Begolka, Lynda Schneider, and Derek K. Chu

Subjects
Pulmonary and Respiratory Medicine, Immunology, Immunology and Allergy
Published
2022
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14. A quantitative approach for the design of robust and cost-effective conservation policies under uncertain climate change: The case of grasshopper conservation in Schleswig-Holstein, Germany

Author

Frank Wätzold, Charlotte Gerling, Klaus Keuler, Astrid Sturm, Johannes A. Leins, and Martin Drechsler

Subjects
Transaction cost, Conservation of Natural Resources, Environmental Engineering, Schleswig holstein, business.industry, Natural resource economics, Climate Change, Cost-Benefit Analysis, Uncertainty, Biodiversity, Climate change, Distribution (economics), Grasshoppers, General Medicine, Management, Monitoring, Policy and Law, Policy, Germany, Economics, Animals, Robustness (economics), business, Waste Management and Disposal, Federal state, Path dependence
Abstract

Climate is a major determinant of the world's distribution of biodiversity and species ranges are expected to shift as the climate changes. For conservation policies to be cost-effective in the long run these changes need to be taken into account. To some extent, policies can be adapted over time, but transaction costs, lock-in effects and path dependence limit the extent to which such adaptation is possible. Thus it is desirable that conservation policies be designed so that they are cost-effective in the long run even without future adaptations. Given that the future climate change is highly uncertain, the policies need to be robust to climatic uncertainty. In this paper we present an approach for the robustness analysis with regard to the cost-effectiveness of conservation policies in the face of uncertain climate change. The approach is applied to the conservation of a grasshopper species in the German federal state of Schleswig-Holstein. For the assessment of the cost-effectiveness of considered policies we develop a climate-ecological-economic model. We show that in the near future all considered policies have a similar level of robustness, while in the more distant future the policies differ substantially in their robustness and a trade-off emerges between the expected performance and robustness of a policy.

Published
2021
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15. Nectaries in fly-deceptive pitcher-trap blossoms of Aristolochia

Author

Claudia Erbar, Peter Leins, and Anna Heiler

Subjects
0106 biological sciences, Ecology, Pollination, Gigantea, Plant Science, Biology, medicine.disease_cause, biology.organism_classification, 010603 evolutionary biology, 01 natural sciences, Brood, Aristolochia, Genus, Pollinator, Pollen, Botany, medicine, Nectar, Ecology, Evolution, Behavior and Systematics, 010606 plant biology & botany
Abstract

The flowers of the eight Aristolochia species studied in this paper (A. arborea, A. clematitis, A. gigantea, A. grandiflora, A. rotunda, A. salvadorensis, A. sempervirens, A. tricaudata) represent three different pollinator deceit cases in this genus: brood site mimic in carrion-fly and fungus-gnat blossoms and food source mimic. In any case, all of them have nectaries on the inner wall of the kettle which provide a small quantity of nectar. As regards the histology, two different types of nectaries can be discerned: the trichomatous type and the so-called nectarioles (termed by Vogel, 1998). The latter type, characterized by clusters of independent and isolated glandular units, is reported for the first time in the kettles of Aristolochia, namely in A. arborea, A. salvadorensis and A. tricaudata. The nectar production in the kettles of the investigated species is regarded as food ensuring survival of the imprisoned pollinators during captivity. Additionally, the location of the nectaries on the inner kettle wall can be interpreted as an adaptation directing the trapped flies to the exit after pollination and fresh pollen loading.

Published
2017
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16. High-resolution PVA along large environmental gradients to model the combined effects of climate change and land use timing: lessons from the large marsh grasshopper

Author

Volker Grimm, Thomas Banitz, Martin Drechsler, and Johannes A. Leins

Subjects
0106 biological sciences, education.field_of_study, geography, geography.geographical_feature_category, 010604 marine biology & hydrobiology, Ecological Modeling, Population, Climate change, Spatial distribution, 010603 evolutionary biology, 01 natural sciences, Grassland, Disturbance (ecology), Effects of global warming, Climate change scenario, Environmental science, Physical geography, education, Environmental gradient
Abstract

Both climate change and land use regimes affect the viability of populations, but they are often studied separately. Moreover, population viability analyses (PVAs) often ignore the effects of large environmental gradients and use temporal resolutions that are too coarse to take into account that different stages of a population's life cycle may be affected differently by climate change. Here, we present the High-resolution Large Environmental Gradient (HiLEG) model and apply it in a PVA with daily resolution based on daily climate projections for Northwest Germany. We used the large marsh grasshopper (LMG) as the target species and investigated (1) the effects of climate change on the viability and spatial distribution of the species, (2) the influence of the timing of grassland mowing on the species and (3) the interaction between the effects of climate change and grassland mowing. The stage- and cohort-based model was run for the spatially differentiated environmental conditions temperature and soil moisture across the whole study region. We implemented three climate change scenarios and analyzed the population dynamics for four consecutive 20-year periods. Climate change alone would lead to an expansion of the regions suitable for the LMG, as warming accelerates development and due to reduced drought stress. However, in combination with land use, the timing of mowing was crucial, as this disturbance causes a high mortality rate in the aboveground life stages. Assuming the same date of mowing throughout the region, the impact on viability varied greatly between regions due to the different climate conditions. The regional negative effects of the mowing date can be divided into five phases: (1) In early spring, the populations were largely unaffected in all the regions; (2) between late spring and early summer, they were severely affected only in warm regions; (3) in summer, all the populations were severely affected so that they could hardly survive; (4) between late summer and early autumn, they were severely affected in cold regions; and (5) in autumn, the populations were equally affected across all regions. The duration and start of each phase differed slightly depending on the climate change scenario and simulation period, but overall, they showed the same pattern. Our model can be used to identify regions of concern and devise management recommendations. The model can be adapted to the life cycle of different target species, climate projections and disturbance regimes. We show with our adaption of the HiLEG model that high-resolution PVAs and applications on large environmental gradients can be reconciled to develop conservation strategies capable of dealing with multiple stressors.

Published
2021
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17. Diversity of styles and mechanisms of secondary pollen presentation in basal Asteraceae—New insights in phylogeny and function

Author

Claudia Erbar and Peter Leins

Subjects
Calyceraceae, Ecology, biology, Barnadesioideae, Plant Science, Mutisioideae, biology.organism_classification, Wunderlichioideae, Asteroideae, Botany, Stifftioideae, Gochnatioideae, Ecology, Evolution, Behavior and Systematics, Mutisia
Abstract

Based on new studies on style morphology of basal subfamilies and tribes of Asteraceae (Barnadesioideae, Famatinanthoideae, Mutisioideae, Stifftioideae, Wunderlichioideae, Gochnatioideae, Hecastocleidoideae), we establish 15 style types in view of shape, bifurcation and distribution of stylar hairs and stigmatic tissue. From the stylar characters and observing different anthetic stages of the proterandrous flowers, we inferred the mechanisms of secondary pollen presentation. The high diversity of stylar shapes in the basal groups of Asteraceae is remarkable. In the most basal subfamily Barnadesioideae, the stylar surface is smooth or, at most, papillate and secondary pollen presentation is either a deposition/primitive brushing or a pump mechanism. Considering Calyceraceae (deposition mechanism) as sister group, we conclude that presumably a deposition/primitive brushing mechanism is the beginning of all secondary pollen presentations in Asteraceae. Whereas in the higher Asteraceae both the brushing and pump mechanisms function perfectly, in some lower Asteraceae, the mechanisms work less efficiently regarding pollen release. The subfamily Mutisioideae is well-defined by the occurrence of true stylar hairs and the tribe Mutisieae by its stigmatic tissue on the margins of the stylar arms, confluent at their tips. The early step from a continuous stigma covering the whole inner surface of the stylar branches (as in most basal members) to a stigma arrangement in two separate lines (as in most Asteroideae) is realized in two ways: either by adhesion of the median ventral tissues of the stylar branches (e.g. Onoseris , Wunderlichia ) or by receptivity loss of the median tissues (e.g. Mutisia ). Our study supports further DNA-based clades by style morphology (e.g. Famatinanthoideae).

Published
2015
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18. Which front-of-pack nutrition label is the most efficient one? The results of an eye-tracker study

Author

Carmen Keller, Michael Siegrist, and Rebecca Leins-Hess

Subjects
Nutrition and Dietetics, Multimedia, Computer science, Information processing, computer.software_genre, Nutrition facts label, Information processing theory, Eye tracking, Table (database), Front of pack, Nutrition information, Guideline Daily Amount, computer, Food Science
Abstract

Different labeling systems that should help consumers make more balanced food decisions have been proposed and are currently in use. In the present study, the effectiveness of three different formats, the nutrition table format, the guideline daily amounts (GDAs) format, and the traffic light (TL) format, was examined. The eye-tracking method was combined with an experimental approach. The participants ( N = 98) were randomly assigned to one of the three formats, and they were asked to evaluate the healthiness of five foods from different food categories. The eye-tracking data suggest that the participants needed more time to process the GDA format in comparison to the traffic light format and the nutrition table format. Moreover, the participants processed the traffic light format more efficiently than the nutrition table. In regard to information processing, the traffic light format was better than the other two formats. The participants were asked how they perceived the healthiness of the food products. The GDA, the TL and the nutrition table formats did not result in substantially different evaluations of the products. From an information processing perspective, the TL format has advantages over the other two formats. The TL format is a consumer-friendly way of communicating nutrition information.

Published
2015
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21. A consumer segmentation of nutrition information use and its relation to food consumption behaviour

Author

Vivianne H.M. Visschers, Simone Dohle, Rebecca Leins-Hess, Christina Hartmann, and Michael Siegrist

Subjects
Economics and Econometrics, Sociology and Political Science, Relation (database), business.industry, media_common.quotation_subject, Nutrition Education, Food technology, Advertising, Management, Monitoring, Policy and Law, Development, Nutrition facts label, Perception, Segmentation, Guideline Daily Amount, Business, Product (category theory), Marketing, Food Science, media_common
Abstract

Consumers need information such as nutrition tables to assess the nutritional value of a food product. Although a broad range of studies has examined consumers’ attention, perception and use of nutrition tables, relatively little is known about what types of consumers use what kind of nutrition information. Therefore, using data from the Swiss Food Panel, we conducted a cluster analysis of nutrition information usage and health and nutrition interest to determine whether consumers could be segmented into specific groups. We identified four segments, which we labelled Official Information Users, Internet Users, Moderate Users and Uninterested. We then determined the segments’ demographics, food frequencies and perception of food. Based on our findings, we provide suggestions for targeted interventions that stimulate healthy food choices among these four segments. Our findings imply that nutrition education or the improvement of nutrition labels is unlikely tostimulate nutrition information usage among all consumer types; some consumers may rather benefit more from environmental cues that prime healthy food choices.

Published
2013
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22. Investigations of a high volume atmospheric plasma torch at 915MHz

Author

Ulrich Stroth, M. Leins, Dennis Kiesler, Andreas Schulz, Matthias Walker, H. Muegge, J. Kopecki, and Mathias Kaiser

Subjects
Argon, Torch, Materials science, Atmospheric pressure, Analytical chemistry, chemistry.chemical_element, Atmospheric-pressure plasma, Surfaces and Interfaces, General Chemistry, Plasma, Condensed Matter Physics, Surfaces, Coatings and Films, law.invention, chemistry, Physics::Plasma Physics, law, Plasma torch, Materials Chemistry, Plasma processing, Microwave
Abstract

An atmospheric pressure microwave plasma torch at a frequency of 915 MHz was developed and investigated. The development was accompanied by simulations of the electromagnetic field distribution in the plasma device with the programme CST Microwave Studio®. Optical emission spectroscopy (OES) was carried out in order to determine the gas temperature of the plasma. The measured temperature of an argon/hydrogen-plasma was up to 7000 K which is high enough to evaporate all materials. As an application we used the plasma torch for reactive evaporation of silicon powder and subsequent deposition of silicon coatings with different morphologies which were investigated mainly by scanning electron microscopy.

Published
2011
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23. Shining a Regulatory Spotlight on New Lasers

Author

Kobi Leins

Subjects
Engineering, Relation (database), Operations research, Emerging technologies, business.industry, Computer security, computer.software_genre, Protocol I, Anticipation (artificial intelligence), Software deployment, Key (cryptography), Relevance (law), Obligation, business, computer
Abstract

The purpose of this article is to consider potential legal implications of deployment of nano-enhanced technology in armed conflict. Nano-lasers will undoubtedly enhance the performance of many weapons systems, including autonomous systems, with better energy storage, more rapid computations, and lower power consumption, to name just a few features, but in this article I consider just two types of technology purportedly utilising nano-lasers. Firstly, I will discuss the Laser Weapons System (“LaWS”), a directed weapon already in use. The LaWS system is often wrongly described as nano-enhanced; I will explain why the descriptor is fallacious while also discussing the legal implications, if any, which arise from the deployment of the system (and whether this error has any legal implications). Secondly, I will examine optogenetics, which utilises nano-laser light delivery technology to effectively switch neurons “on” and “off” to alter brain function. This technology is currently at the research stage with mice, and has not yet been used by the military. I plan to identify the key legal implications if such technology were to be used in humans in armed conflict.Two key legal issues arise in relation to both technological developments. One involves the responsibility of States Parties to Additional Protocol I to review and supervise the use of emerging weapons technology to ensure compliance with the law of armed conflict (LOAC) and the second involves identifying what specific and general rules may apply to such technology. General legal principles have relevance to all means and methods of warfare and so apply as much to nano-enhanced or based laser weapons systems as to any other category of lethal or non-lethal weapon. Furthermore, the lack of anticipation of the technology by the original drafters does not remove the obligation to review any such technology before its use in armed conflict.

Published
2016
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25. Automatic processing of self-regulation of slow cortical potentials: evidence from brain-computer communication in paralysed patients

Author

Jochen Kaiser, Nicola Neumann, Ulrike Leins, Andrea Kübler, Niels Birbaumer, and Thilo Hinterberger

Subjects
Adult, Male, Automaticity, Communication Aids for Disabled, Focalization, Physiology (medical), Adaptation, Psychological, Reaction Time, medicine, Humans, Paralysis, Autoregulation, Cognitive skill, Motor skill, Brain–computer interface, Cerebral Cortex, Computers, Communication, Amyotrophic Lateral Sclerosis, Brain, Equipment Design, Social Control, Informal, Neurophysiology, medicine.disease, Sensory Systems, Electrophysiology, Electrooculography, Neurology, Neurology (clinical), Locked-in syndrome, Psychology, Neuroscience
Abstract

Objective : Direct brain-computer communication utilizes self-regulation of brain potentials to select letters, words or symbols from a computer menu. Selection of letters or words with brain potentials requires simultaneous processing of several tasks such as production of certain brain potentials at predefined time points simultaneously with processing of presented letter strings. This study addresses the question of whether the self-regulation of slow cortical potentials (SCP) automatizes with practice and can thus be considered as a skill comparable to motor or cognitive skills. Methods : Two nearly completely paralysed patients learned over several months to produce electrocortically negative and positive SCP by means of visual feedback. Improved performance and a reduction in performance variability were regarded as behavioural indicators for automaticity, while the topographic focalization of cortical activation was considered as a neurophysiological indicator for automaticity. Different indicators of automaticity were expected to covary along with practice. Results : In patient 1, performance measured as the percentage of correct SCP shifts increased simultaneously with the topographic focalization of cortical activation. His performance became more stable with practice. For this patient the criteria for automaticity were all met. In patient 2, performance also improved, but his cortical activity became topographically less focal. His performance was less stable than that of patient 1. Conclusions : The present findings, albeit on only two subjects, provide preliminary evidence that SCP self-regulation may automatize with long-term practice and can therefore be considered a skill.

Published
2004
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26. Search for the single production of doubly-charged Higgs bosons and constraints on their couplings from Bhabha scattering

Author

C. F. Vollmer, Jochen Schieck, R. J. Barlow, Alexander Oh, I. Nakamura, D. Lanske, Graham Wilson, Gunter Wolf, K. Stephens, N. Kanaya, Tara Shears, Shlomo Dado, D. Karlen, H. Mes, I. P. Duerdoth, S. Braibant, K. Hoffman, A. Leins, P. Gagnon, S. Yamashita, P. Igo-Kemenes, K. Ishii, H. Jeremie, Richard Teuscher, D. Toya, Giora Mikenberg, Arnulf Quadt, O. Schaile, H. Landsman, P. M. Watkins, J. Grunhaus, P. J. Bell, L. Brigliadori, T. Kuhl, R. J. Batley, M. J. Oreglia, A. D. Schaile, Gabriella Pasztor, P. Vannerem, D. R. Ward, Yoram Rozen, Zoltan Laszlo Trocsanyi, Dong Hee Kim, G. Gaycken, L. L. Kormos, G. Anagnostou, Richard J. K. Taylor, Gideon Bella, James Pinfold, R. Seuster, L. Zivkovic, E. L. Barberio, P. Renkel, M. Schumacher, A. J. Martin, H. J. Burckhart, M. Groll, Silvia Arcelli, D. E. Plane, S. W. O'Neale, C. P. Ward, Satoshi Mihara, P. O. Günther, Erez Etzion, J. R. Carter, G. N. Patrick, Katja Klein, Junichi Kanzaki, J. Polok, Stefan Kluth, Shlomit Tarem, W. Menges, Otmar Biebel, S. Söldner-Rembold, Sachio Komamiya, K. Buesser, E. A. De Wolf, Pamela Ferrari, J. G. Layter, M. Giunta, Georges Azuelos, K. J. Anderson, Daniel Lellouch, P. Amaral, J. A. McKenna, W. Mader, E. Tsur, C. M. Hawkes, J. Goldberg, Frank Fiedler, H. Nanjo, D. Waller, Takehiko Mori, A. Okpara, D. Axen, Oana Elena Vickey Boeriu, K. Kruger, T. Saeki, Gianni Masetti, C. Y. Chang, P. Tran, Matthias Schröder, Norbert Wermes, T. Kawamoto, C. Pahl, D. J. Miller, F. Spano, Peter Sherwood, Isabel Marian Trigger, K. W. Bell, G. D. Lafferty, S. Orito, H. Voss, T. J. McMahon, J. C. Hill, J. Ludwig, Christoph Rembser, P. Scharff-Hansen, K. Runge, S. Moed, P. Bock, Tobias Kramer, W. J. McDonald, B. C. Shen, P. F. Åkesson, Klaus Rabbertz, R. J. Hemingway, M. Donkers, Siegfried Bethke, M. A. Thomson, Stephen Lloyd, J. Dubbert, Robert Vertesi, R. K. Carnegie, T. Schörner-Sadenius, J. Lillich, G. Giacomelli, W. G. Scott, Dave Charlton, M. Gruwé, Raimund Ströhmer, A. M. Smith, A. Mutter, C. Hensel, A. De Roeck, M. Kobel, P. Jovanovic, E. K. U. Gross, Peter Krieger, J. W. Gary, Ehud Duchovni, Andris Skuja, T. Behnke, Frans Meijers, Guenter Duckeck, K. Harder, Richard Nisius, Tetsuro Mashimo, M. F. Turner-Watson, A. Macpherson, A. Michelini, Shoji Asai, Marek Tasevsky, Paolo Giacomelli, Dezso Horvath, R. D. Heuer, J. A. Wilson, Marco Cuffiani, M. Kupper, Beatrix Dienes, T. Kobayashi, S. Campana, J. M. Roney, R. M. Brown, Lorne Levinson, M. Harin-Dirac, Koichi Nagai, B. W. Kennedy, I. R. Bailey, W. Mohr, G. Karapetian, Gideon Alexander, Achim Stahl, E. Torrence, A. Gupta, A. Csilling, S. Rosati, A. Harel, Ikuo Ueda, D. M. Strom, J. Lu, M. Hamann, Richard Keeler, R. J. Sobie, Joost Vossebeld, Klaus Desch, T. R. Junk, P. S. Wells, Robert McPherson, J. von Krogh, Terry Richard Wyatt, A. T. Watson, Fabrizio Fabbri, A. Frey, R. J. Hawkings, D. Wetterling, M. Przybycień, A. A. Carter, M. Verzocchi, Giovanni Abbiendi, Christoph Geich-Gimbel, A. Fürtjes, Lutz Feld, M. Boutemeur, F. S. Merritt, Kiyotomo Kawagoe, G. P. Siroli, Christoph Schwick, Thorsten Wengler, B. Caron, Gabriele Benelli, M. Hauschild, Gregor Herten, J. E. Pilcher, N. K. Watson, C. Ainsley, P. Mättig, Alain Bellerive, B. Poli, K. Sachs, Philip Bechtle, Oliver Pooth, John Allison, R. G. Kellogg, Csaba Hajdu, Stefano Marcellini, James Letts, D. Zer-Zion, F. K. Loebinger, Ivor Fleck, Joleen Pater, Edward K. G. Sarkisyan, A. Klier, Balazs Ujvari, H. A. Neal, Gordon H. Hanson, and M. Ford

Subjects
Physics, Particle physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Yukawa potential, FOS: Physical sciences, 01 natural sciences, Lepton number, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment, Lepton, Event generator, Bhabha scattering, Boson
Abstract

A search for single production of doubly-charged Higgs bosons has been performed using 600.7 pb^-1 of e+e- collision data with sqrt(s)=189--209GeV collected by the OPAL detector at LEP. No evidence for the existence of H++/-- is observed. Upper limits on the Yukawa coupling of the H++/-- to like-signed electron pairs are derived. Additionally, indirect constraints on the Yukawa coupling from Bhabha scattering, where the H++/-- would contribute via t-channel exchange, are derived for M(H++/--) < 2TeV. These are the first results for both a single production search and constraints from Bhabha scattering reported from LEP., 20 pages, 9 figures, Submitted to Phys. Lett. B

Published
2003
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27. Search for stable and long-lived massive charged particles in e+e− collisions at =130209 GeV

Author

D. Axen, Oana Elena Vickey Boeriu, James Pinfold, W. J. McDonald, R. Seuster, C. F. Vollmer, F. Spano, Gideon Bella, H. J. Burckhart, Peter Sherwood, B. C. Shen, Jochen Schieck, P. Mättig, Shoji Asai, R. J. Barlow, J. Ludwig, K. Runge, P. Bock, A. D. Schaile, Gabriella Pasztor, G. P. Siroli, Daniel Lellouch, Christoph Schwick, M. Donkers, Takehiko Mori, A. Okpara, Siegfried Bethke, P. Vannerem, P. F. Åkesson, W. G. Scott, D. E. Plane, C. P. Ward, P. Tran, C. Hensel, S. Söldner-Rembold, J. W. Gary, H. Mes, Alexander Oh, Kiyotomo Kawagoe, J. Goldberg, L. L. Kormos, T. Behnke, Oliver Pooth, K. Hoffman, John Allison, I. Nakamura, H. Landsman, S. Yamashita, P. Igo-Kemenes, Ehud Duchovni, A. Leins, D. Lanske, I. P. Duerdoth, S. Braibant, Dave Charlton, A. J. Martin, W. Menges, Otmar Biebel, P. Gagnon, L. Brigliadori, R. K. Keeler, Guenter Duckeck, K. Ishii, H. Jeremie, Marek Tasevsky, Dezso Horvath, E. Torrence, A. Gupta, A. Csilling, Graham Wilson, M. Gruwé, N. K. Watson, Zoltan Laszlo Trocsanyi, Dong Hee Kim, Yoram Rozen, Shlomo Dado, Arnulf Quadt, W. Mader, P. M. Watkins, R. D. Heuer, Richard Nisius, D. Toya, A. Michelini, Tara Shears, R. G. Kellogg, E. L. Barberio, K. Harder, O. Schaile, T. Kuhl, T. Kobayashi, Christoph Rembser, Richard J. K. Taylor, Erez Etzion, Giora Mikenberg, R. J. Batley, Csaba Hajdu, Marco Cuffiani, Junichi Kanzaki, J. Polok, Stefano Marcellini, S. Campana, P. Renkel, R. M. Brown, Stefan Kluth, K. Buesser, G. Gaycken, C. Ainsley, Lorne Levinson, Silvia Arcelli, Shlomit Tarem, James Letts, P. J. Bell, M. A. Thomson, S. W. O'Neale, R. J. Hemingway, I. R. Bailey, Georges Azuelos, M. Schumacher, E. Tsur, E. K. U. Gross, J. Lillich, C. M. Hawkes, P. O. Günther, B. W. Kennedy, E. A. De Wolf, M. Giunta, P. Jovanovic, Isabel Marian Trigger, K. W. Bell, Norbert Wermes, Peter Krieger, T. Kawamoto, Gideon Alexander, Gordon H. Hanson, Gunter Wolf, H. Nanjo, P. Amaral, J. C. Hill, Tobias Kramer, Richard Teuscher, M. Ford, J. M. Roney, K. J. Anderson, C. Pahl, D. Karlen, Koichi Nagai, S. Orito, W. Mohr, Raimund Ströhmer, Klaus Rabbertz, B. Poli, Stephen Lloyd, T. R. Wyatt, George Lafferty, Satoshi Mihara, M. J. Oreglia, Katja Klein, K. Sachs, Philip Bechtle, L. Zivkovic, D. Zer-Zion, J. R. Carter, G. N. Patrick, F. K. Loebinger, Ivor Fleck, Frank Fiedler, K. Stephens, N. Kanaya, Joleen Pater, Edward K. G. Sarkisyan, A. Klier, Beatrix Dienes, Balazs Ujvari, H. A. Neal, M. Boutemeur, F. S. Merritt, Gianni Masetti, C. Y. Chang, D. R. Ward, J. A. McKenna, S. Moed, Christoph Geich-Gimbel, J. Grunhaus, A. Fürtjes, Lutz Feld, M. Hamann, Sachio Komamiya, R. J. Sobie, Thorsten Wengler, Joost Vossebeld, B. Caron, D. Waller, K. Kruger, T. Saeki, Klaus Desch, Gabriele Benelli, P. Scharff-Hansen, A. M. Smith, Andris Skuja, Tetsuro Mashimo, M. F. Turner-Watson, A. Macpherson, T. R. Junk, A. Mutter, M. Kupper, P. S. Wells, M. Hauschild, A. T. Watson, Matthias Schröder, T. J. McMahon, Achim Stahl, D. J. Miller, J. Dubbert, Robert Vertesi, R. K. Carnegie, S. Rosati, J. A. Wilson, Gregor Herten, Robert McPherson, G. Karapetian, A. Harel, T. Schörner-Sadenius, Alain Bellerive, Ikuo Ueda, D. M. Strom, J. Lu, Fabrizio Fabbri, A. Frey, J. E. Pilcher, M. Przybycień, A. A. Carter, M. Verzocchi, G. Anagnostou, Paolo Giacomelli, Giovanni Abbiendi, J. von Krogh, M. Harin-Dirac, R. J. Hawkings, D. Wetterling, Pamela Ferrari, J. G. Layter, H. Voss, G. Giacomelli, A. De Roeck, M. Kobel, and Frans Meijers

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Muon, 010308 nuclear & particles physics, Scalar (mathematics), Supersymmetry, 01 natural sciences, Electric charge, Charged particle, Nuclear physics, Chargino, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment, Lepton
Abstract

A search for stable and long-lived massive particles of electric charge |Q/e|=1 or fractional charges of 2/3, 4/3, and 5/3 is reported using data collected by the OPAL detector at LEP, at centre-of-mass energies from 130 to 209 GeV. These particles are assumed to be pair-produced in e+e- collisions and not to interact strongly. No evidence for the production of these particles was observed. Model-independent upper limits on the production cross-section between 0.005 and 0.028 pb have been derived for scalar and spin-1/2 particles with charge +-1. Within the framework of the Constrained Minimal Supersymmetric Standard Model (CMSSM), this implies a lower limit of 98.0 (98.5) GeV on the mass of long-lived right (left)- handed scalar muons and scalar taus. Long-lived charged heavy leptons and charginos are excluded for masses below 102.0 GeV. For particles with fractional charge +-2/3, +-4/3, and +-5/3, the upper limit on the production cross-section varies between 0.005 and 0.020 pb. All mass and cross-section limits are derived at the 95% confidence level and are valid for particles with lifetimes longer than 10-6s. A search for stable and long-lived massive particles of electric charge | Q / e |=1 or fractional charges of 2/3, 4/3, and 5/3 is reported using data collected by the OPAL detector at LEP, at centre-of-mass energies from 130 to 209 GeV. These particles are assumed to be pair-produced in e + e − collisions and not to interact strongly. No evidence for the production of these particles was observed. Model-independent upper limits on the production cross-section between 0.005 and 0.028 pb have been derived for scalar and spin-1/2 particles with charge ±1. Within the framework of the Constrained Minimal Supersymmetric Standard Model (CMSSM), this implies a lower limit of 98.0 (98.5) GeV on the mass of long-lived right- (left-)handed scalar muons and scalar taus. Long-lived charged heavy leptons and charginos are excluded for masses below 102.0 GeV. For particles with fractional charge ±2/3, ±4/3 and ±5/3, the upper limit on the production cross-section varies between 0.005 and 0.020 pb. All mass and cross-section limits are derived at the 95% confidence level and are valid for particles with lifetimes longer than 10 −6 s. A search for stable and long-lived massive particles of electric charge |Q/e|=1 or fractional charges of 2/3, 4/3, and 5/3 is reported using data collected by the OPAL detector at LEP, at centre-of-mass energies from 130 to 209 GeV. These particles are assumed to be pair-produced in e+e- collisions and not to interact strongly. No evidence for the production of these particles was observed. Model-independent upper limits on the production cross-section between 0.005 and 0.028 pb have been derived for scalar and spin-1/2 particles with charge +-1. Within the framework of the Constrained Minimal Supersymmetric Standard Model (CMSSM), this implies a lower limit of 98.0 (98.5) GeV on the mass of long-lived right (left)- handed scalar muons and scalar taus. Long-lived charged heavy leptons and charginos are excluded for masses below 102.0 GeV. For particles with fractional charge +-2/3, +-4/3, and +-5/3, the upper limit on the production cross-section varies between 0.005 and 0.020 pb. All mass and cross-section limits are derived at the 95% confidence level and are valid for particles with lifetimes longer than 10-6s.

Published
2003
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28. A measurement of the τ−→μ−ν̄μντ branching ratio

Author

G Abbiendi, C Ainsley, P.F Åkesson, G Alexander, J Allison, P Amaral, G Anagnostou, K.J Anderson, S Arcelli, S Asai, D Axen, G Azuelos, I Bailey, E Barberio, R.J Barlow, R.J Batley, P Bechtle, T Behnke, K.W Bell, P.J Bell, G Bella, A Bellerive, G Benelli, S Bethke, O Biebel, I.J Bloodworth, O Boeriu, P Bock, D Bonacorsi, M Boutemeur, S Braibant, L Brigliadori, R.M Brown, K Buesser, H.J Burckhart, S Campana, R.K Carnegie, B Caron, A.A Carter, J.R Carter, C.Y Chang, D.G Charlton, A Csilling, M Cuffiani, S Dado, S Dallison, A De Roeck, E.A De Wolf, K Desch, B Dienes, M Donkers, J Dubbert, E Duchovni, G Duckeck, I.P Duerdoth, E Elfgren, E Etzion, F Fabbri, L Feld, P Ferrari, F Fiedler, I Fleck, M Ford, A Frey, A Fürtjes, P Gagnon, J.W Gary, G Gaycken, C Geich-Gimbel, G Giacomelli, P Giacomelli, M Giunta, J Goldberg, E Gross, J Grunhaus, M Gruwé, P.O Günther, A Gupta, C Hajdu, M Hamann, G.G Hanson, K Harder, A Harel, M Harin-Dirac, M Hauschild, J Hauschildt, C.M Hawkes, R Hawkings, R.J Hemingway, C Hensel, G Herten, R.D Heuer, J.C Hill, K Hoffman, R.J Homer, D Horváth, R Howard, P Igo-Kemenes, K Ishii, H Jeremie, P Jovanovic, T.R Junk, N Kanaya, J Kanzaki, G Karapetian, D Karlen, V Kartvelishvili, K Kawagoe, T Kawamoto, R.K Keeler, R.G Kellogg, B.W Kennedy, D.H Kim, K Klein, A Klier, S Kluth, T Kobayashi, M Kobel, S Komamiya, L Kormos, T Krämer, T Kress, P Krieger, J von Krogh, D Krop, K Kruger, T Kuhl, M Kupper, G.D Lafferty, H Landsman, D Lanske, J.G Layter, A Leins, D Lellouch, L Levinson, J Lillich, S.L Lloyd, F.K Loebinger, J Lu, J Ludwig, A Macpherson, W Mader, S Marcellini, T.E Marchant, A.J Martin, J.P Martin, G Masetti, T Mashimo, W.J McDonald, J McKenna, T.J McMahon, R.A McPherson, F Meijers, P Mendez-Lorenzo, W Menges, F.S Merritt, H Mes, A Michelini, S Mihara, G Mikenberg, D.J Miller, S Moed, W Mohr, T Mori, A Mutter, K Nagai, I Nakamura, H.A Neal, R Nisius, S.W O'Neale, A Oh, A Okpara, M.J Oreglia, S Orito, C Pahl, G Pásztor, J.R Pater, G.N Patrick, J.E Pilcher, J Pinfold, D.E Plane, B Poli, J Polok, O Pooth, M Przybycień, A Quadt, K Rabbertz, C Rembser, P Renkel, H Rick, J.M Roney, S Rosati, Y Rozen, K Runge, K Sachs, T Saeki, O Sahr, E.K.G Sarkisyan, A.D Schaile, O Schaile, P Scharff-Hansen, J Schieck, T Schörner-Sadenius, M Schröder, M Schumacher, C Schwick, W.G Scott, R Seuster, T.G Shears, B.C Shen, P Sherwood, G Siroli, A Skuja, A.M Smith, R Sobie, S Söldner-Rembold, F Spano, A Stahl, K Stephens, D Strom, R Ströhmer, S Tarem, M Tasevsky, R.J Taylor, R Teuscher, M.A Thomson, E Torrence, D Toya, P Tran, T Trefzger, A Tricoli, I Trigger, Z Trócsányi, E Tsur, M.F Turner-Watson, I Ueda, B Ujvári, B Vachon, C.F Vollmer, P Vannerem, M Verzocchi, H Voss, J Vossebeld, D Waller, C.P Ward, D.R Ward, P.M Watkins, A.T Watson, N.K Watson, P.S Wells, T Wengler, N Wermes, D Wetterling, G.W Wilson, J.A Wilson, G Wolf, T.R Wyatt, S Yamashita, D Zer-Zion, L Zivkovic, J Letts, P Mättig, and OPAL Collaboration

Subjects
Physics, Coupling constant, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, 01 natural sciences, Nuclear physics, 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, 010306 general physics, Lepton, Minimal Supersymmetric Standard Model
Abstract

The tau -> mu nu nu branching ratio has been measured using data collected from 1990 to 1995 by the OPAL detector at the LEP collider. The resulting value of B(tau -> mu nu nu) = 0.1734 +- 0.0009(stat) +- 0.0006(syst) has been used in conjunction with other OPAL measurements to test lepton universality, yielding the coupling constant ratios gmu/ge=1.0005+-0.0044 and gt/ge=1.0031+-0.0048, in good agreement with the Standard Model prediction of unity. A value for the Michel parameter eta = 0.004 +- 0.037 has also been determined and used to find a limit for the mass of the charged Higgs boson mH+- > 1.25 tan beta, in the Minimal Supersymmetric Standard Model.

Published
2003
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29. Search for associated production of massive states decaying into two photons in e+e− annihilations at =88–209 GeV

Author

Abbiendi, G., Ainsley, C., Akesson, P.F., Alexander, G., Allison, John, Amaral, P., Anagnostou, G., Anderson, K.J., Arcelli, S., Asai, S., Axen, D., Azuelos, G., Bailey, I., Barberio, E., Barlow, R.J., Batley, R.J., Bechtle, P., Behnke, T., Bell, Kenneth Watson, Bell, P.J., Bella, G., Bellerive, A., Benelli, G., Bethke, S., Biebel, O., Bloodworth, I.J., Boeriu, O., Bock, P., Bonacorsi, D., Boutemeur, M., Braibant, S., Brigliadori, L., Brown, Robert M., Buesser, K., Burckhart, H.J., Cammin, J., Campana, S., Carnegie, R.K., Caron, B., Carter, A.A., Carter, J.R., Chang, C.Y., Charlton, David G., Cohen, I., Csilling, A., Cuffiani, M., Dado, S., Dallavalle, G.Marco, Dallison, S., De Roeck, A., De Wolf, E.A., Desch, K., Donkers, M., Dubbert, J., Duchovni, E., Duckeck, G., Duerdoth, I.P., Elfgren, E., Etzion, E., Fabbri, F., Feld, L., Ferrari, P., Fiedler, F., Fleck, I., Ford, M., Frey, A., Furtjes, A., Gagnon, P., Gary, John William, Gaycken, G., Geich-Gimbel, C., Giacomelli, G., Giacomelli, P., Giunta, Marina, Goldberg, J., Gross, E., Grunhaus, J., Gruwe, M., Gunther, P.O., Gupta, A., Hajdu, C., Hamann, M., Hanson, G.G., Harder, K., Harel, A., Harin-Dirac, M., Hauschild, M., Hauschildt, J., Hawkes, C.M., Hawkings, R., Hemingway, R.J., Hensel, C., Herten, G., Heuer, R.D., Hill, J.C., Hoffman, Kara Dion, Homer, R.J., Horvath, D., Howard, R., Huntemeyer, P., Igo-Kemenes, P., Ishii, K., Jeremie, H., Jovanovic, P., Junk, T.R., Kanaya, N., Kanzaki, J., Karapetian, G., Karlen, D., Kartvelishvili, V., Kawagoe, K., Kawamoto, T., Keeler, R.K., Kellogg, R.G., Kennedy, B.W., Kim, D.H., Klein, K., Klier, A., Kluth, S., Kobayashi, T., Kobel, M., Kokott, T.P., Komamiya, S., Kormos, Laura L., Kowalewski, Robert V., Kramer, T., Kress, T., Krieger, P., von Krogh, J., Krop, D., Kupper, M., Kyberd, P., Lafferty, G.D., Landsman, H., Lanske, D., Layter, J.G., Leins, A., Lellouch, D., Letts, J., Levinson, L., Lillich, J., Lloyd, S.L., Loebinger, F.K., Lu, J., Ludwig, J., Macpherson, A., Mader, W., Marcellini, S., Marchant, T.E., Martin, A.J., Martin, J.P., Masetti, G., Mashimo, T., Mattig, Peter, McDonald, W.J., McKenna, J., McMahon, T.J., McPherson, R.A., Meijers, F., Mendez-Lorenzo, P., Menges, W., Merritt, F.S., Mes, H., Michelini, A., Mihara, S., Mikenberg, G., Miller, D.J., Moed, S., Mohr, W., Mori, T., Mutter, A., Nagai, K., Nakamura, I., Neal, H.A., Nisius, R., O'Neale, S.W., Oh, A., Okpara, A., Oreglia, M.J., Orito, S., Pahl, C., Pasztor, G., Pater, J.R., Patrick, G.N., Pilcher, J.E., Pinfold, J., Plane, David E., Poli, B., Polok, J., Pooth, O., Przybycien, M., Quadt, A., Rabbertz, K., Rembser, C., Renkel, P., Rick, H., Roney, J.M., Rosati, S., Rozen, Y., Runge, K., Rust, D.R., Sachs, K., Saeki, T., Sahr, O., Sarkisyan, E.K.G., Schaile, A.D., Schaile, O., Scharff-Hansen, P., Schieck, J., Schoerner-Sadenius, Thomas, Schroder, Matthias, Schumacher, M., Schwick, C., Scott, W.G., Seuster, R., Shears, T.G., Shen, B.C., Shepherd-Themistocleous, C.H., Sherwood, P., Siroli, G., Skuja, A., Smith, A.M., Sobie, R., Soldner-Rembold, S., Spagnolo, S., Spano, F., Stahl, A., Stephens, K., Strom, David M., Strohmer, R., Tarem, S., Tasevsky, M., Taylor, R.J., Teuscher, R., Thomson, M.A., Torrence, E., Toya, D., Tran, P., Trefzger, T., Tricoli, A., Trigger, I., Trocsanyi, Z., Tsur, E., Turcot, A.S., Turner-Watson, M.F., Ueda, I., Ujvari, B., Vachon, B., Vollmer, C.F., Vannerem, P., Verzocchi, M., Voss, H., Vossebeld, J., Waller, D., Ward, C.P., Ward, D.R., Watkins, P.M., Watson, A.T., Watson, N.K., Wells, P.S., Wengler, T., Wermes, N., Wetterling, D., Wilson, G.W., Wilson, J.A., Wolf, G., Wyatt, T.R., Yamashita, S., Zacek, V., Zer-Zion, D., Zivkovic, Lidija, and OPAL Collaboration

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Scalar (mathematics), FOS: Physical sciences, Sigma, Context (language use), 01 natural sciences, High Energy Physics - Experiment, Gamma gamma, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, Production (computer science), Limit (mathematics), 010306 general physics, Particle Physics - Experiment
Abstract

A search is performed for production of short-lived particles in e+e- -> XY, with X -> gamma gamma and Y -> ffbar, for scalar X and scalar or vector Y. Model-independent limits in the range of 25-60 femtobarns are presented on sigma (e+e- -> XY) x B(X -> ffbar) for centre-of-mass energies in the range 205-207 GeV. The data from all LEP centre-of-mass energies 88-209 GeV are also interpreted in the context of fermiophobic Higgs boson models, for which a lower mass limit of 105.5 GeV is obtained for a "benchmark" fermiophobic Higgs boson., 17 pages, 4 figures

Published
2002
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30. Measurement of the hadronic photon structure function F2γ at LEP2

Author

Abbiendi, G., Ainsley, C., Akesson, P. F., Alexander, G., Allison, J., Anagnostou, G., Anderson, K. J., Asai, S., Axen, D., Azuelos, G., Bailey, I., Barberio, E., Barlow, R. J., Batley, R. J., Bechtle, P., Behnke, T., Bell, K. W., Bell, P. J., Bella, G., Bellerive, A., Benelli, G., Bethke, S., Biebel, O., Bloodworth, I. J., Boeriu, O., Bock, P., Bonacorsi, D., Boutemeur, M., Braibant, S., Brigliadori, L., Brown, R. M., Buesser, K., Burckhart, H. J., Cammin, J., Campana, S., Carnegie, R. K., Caron, B., Carter, A. A., Carter, J. R., Chang, C. Y., Charlton, D. G., Cohen, I., Csilling, A., Cuffiani, M., Dado, S., Dallavalle, G. M., Dallison, S., Roeck, A., Wolf, E. A., Desch, K., Donkers, M., Dubbert, J., Duchovni, E., Duckeck, G., Duerdoth, I. P., Etzion, E., Fabbri, F., Feld, L., Ferrari, P., Fiedler, F., Fleck, I., Ford, M., Frey, A., Furtjes, A., Gagnon, P., Gary, J. W., Gaycken, G., Geich-Gimbel, C., Giacomelli, G., Giacomelli, P., Giunta, M., Goldberg, J., Gross, E., Grunhaus, J., Gruwe, M., Gunther, P. O., Gupta, A., Hajdu, C., Hamann, M., Hanson, G. G., Harder, K., Harel, A., Harin-Dirac, M., Hauschild, M., Hauschildt, J., Hawkes, C. M., Hawkings, R., Hemingway, R. J., Hensel, C., Herten, G., Heuer, R. D., Hill, J. C., Hoffman, K., Homer, R. J., Horvath, D., Howard, R., Huntemeyer, P., Igo-Kemenes, P., Ishii, K., Jeremie, H., Jones, C. R., Jovanovic, P., Junk, T. R., Kanaya, N., Kanzaki, J., Karapetian, G., Karlen, D., Kartvelishvili, V., Kawagoe, K., Kawamoto, T., Keeler, R. K., Kellogg, R. G., Kennedy, B. W., Kim, D. H., Klein, K., Klier, A., Kluth, S., Kobayashi, T., Kobel, M., Kokott, T. P., Komamiya, S., Kormos, L., Kowalewski, R. V., Kramer, T., Kress, T., Krieger, P., Krogh, J., Krop, D., Kuhl, T., Kupper, M., Kyberd, P., Lafferty, G. D., Landsman, H., Lanske, D., Layter, J. G., Leins, A., Lellouch, D., Letts, J., Levinson, L., Lillich, J., Littlewood, C., Lloyd, S. L., Loebinger, F. K., Lu, J., Ludwig, J., Macchiolo, A., Macpherson, A., Mader, W., Marcellini, S., Marchant, T. E., Martin, A. J., Martin, J. P., Masetti, G., Mashimo, T., Mattig, P., Mcdonald, W. J., Mckenna, J., Mcmahon, T. J., Mcpherson, R. A., Meijers, F., Mendez-Lorenzo, P., Menges, W., Merritt, F. S., Mes, H., Michelini, A., Mihara, S., Mikenberg, G., Miller, D. J., Moed, S., Mohr, W., Mori, T., Mutter, A., Nagai, K., Nakamura, I., Neal, H. A., Nisius, R., O Neale, S. W., Oh, A., Okpara, A., Oreglia, M. J., Orito, S., Pahl, C., Pasztor, G., Pater, J. R., Patrick, G. N., Pilcher, J. E., Pinfold, J., Plane, D. E., Poli, B., Polok, J., Pooth, O., Quadt, A., Rabbertz, K., Rembser, C., Renkel, P., Rick, H., Roney, J. M., Rosati, S., Rozen, Y., Runge, K., Rust, D. R., Sachs, K., Saeki, T., Sahr, O., Sarkisyan, E. K. G., Schaile, A. D., Schaile, O., Scharff-Hansen, P., Schroder, M., Schumacher, M., Schwick, C., Scott, W. G., Seuster, R., Shears, T. G., Shen, B. C., Shepherd-Themistocleous, C. H., Sherwood, P., Siroli, G., Skuja, A., Smith, A. M., Sobie, R., Soldner-Rembold, S., stefania spagnolo, Spano, F., Stahl, A., Stephens, K., Strom, D., Strohmer, R., Tarem, S., Tasevsky, M., Taylor, R. J., Teuscher, R., Thomson, M. A., Torrence, E., Toya, D., Tran, P., Trefzger, T., Tricoli, A., Trigger, I., Trocsanyi, Z., Tsur, E., Turner-Watson, M. F., Ueda, I., Ujvari, B., Vachon, B., Vollmer, C. F., Vannerem, P., Verzocchi, M., Voss, H., Vossebeld, J., Waller, D., Ward, C. P., Ward, D. R., Watkins, P. M., Watson, A. T., Watson, N. K., Wells, P. S., Wengler, T., Wermes, N., Wetterling, D., Wilson, G. W., Wilson, J. A., Wyatt, T. R., Yamashita, S., Zacek, V., Zer-Zion, D., Opal Collaboration, G., Abbiendi, C., Ainsley, P. F., Akesson, G., Alexander, J., Allison, G., Anagnostou, K. J., Anderson, S., Asai, D., Axen, G., Azuelo, I., Bailey, E., Barberio, R. J., Barlow, R. J., Batley, P., Bechtle, T., Behnke, K. W., Bell, P. J., Bell, G., Bella, A., Bellerive, G., Benelli, S., Bethke, O., Biebel, I. J., Bloodworth, O., Boeriu, P., Bock, D., Bonacorsi, M., Boutemeur, S., Braibant, L., Brigliadori, R. M., Brown, K., Buesser, H. J., Burckhart, J., Cammin, S., Campana, R. K., Carnegie, B., Caron, A. A., Carter, J. R., Carter, C. Y., Chang, D. G., Charlton, I., Cohen, A., Csilling, M., Cuffiani, S., Dado, G. M., Dallavalle, S., Dallison, A., De Roeck, E. A., De, K., Desch, M., Donker, J., Dubbert, E., Duchovni, G., Duckeck, I. P., Duerdoth, E., Etzion, F., Fabbri, L., Feld, P., Ferrari, F., Fiedler, I., Fleck, M., Ford, A., Frey, A., Furtje, P., Gagnon, J. W., Gary, G., Gaycken, C., Geich Gimbel, G., Giacomelli, P., Giacomelli, M., Giunta, J., Goldberg, E., Gro, J., Grunhau, M., Gruwe, P. O., Gunther, A., Gupta, C., Hajdu, M., Hamann, G. G., Hanson, K., Harder, A., Harel, M., Harin Dirac, M., Hauschild, J., Hauschildt, C. M., Hawke, R., Hawking, R. J., Hemingway, C., Hensel, G., Herten, R. D., Heuer, J. C., Hill, K., Hoffman, R. J., Homer, D., Horvath, R., Howard, P., Huntemeyer, P., Igo Kemene, K., Ishii, H., Jeremie, C. R., Jone, P., Jovanovic, T. R., Junk, N., Kanaya, J., Kanzaki, G., Karapetian, D., Karlen, V., Kartvelishvili, K., Kawagoe, T., Kawamoto, R. K., Keeler, R. G., Kellogg, B. W., Kennedy, D. H., Kim, K., Klein, A., Klier, S., Kluth, T., Kobayashi, M., Kobel, T. P., Kokott, S., Komamiya, L., Kormo, R. V., Kowalewski, T., Kramer, T., Kre, P., Krieger, J., von Krogh, D., Krop, T., Kuhl, M., Kupper, P., Kyberd, G. D., Lafferty, H., Landsman, D., Lanske, J. G., Layter, A., Lein, D., Lellouch, J., Lett, L., Levinson, J., Lillich, C., Littlewood, S. L., Lloyd, F. K., Loebinger, J., Lu, J., Ludwig, A., Macchiolo, A., Macpherson, W., Mader, S., Marcellini, T. E., Marchant, A. J., Martin, J. P., Martin, G., Masetti, T., Mashimo, P., Mattig, W. J., Mcdonald, J., Mckenna, T. J., Mcmahon, R. A., Mcpherson, F., Meijer, P., Mendez Lorenzo, W., Menge, F. S., Merritt, H., Me, A., Michelini, S., Mihara, G., Mikenberg, D. J., Miller, S., Moed, W., Mohr, T., Mori, A., Mutter, K., Nagai, I., Nakamura, H. A., Neal, R., Nisiu, S. W., O'Neale, A., Oh, A., Okpara, M. J., Oreglia, S., Orito, C., Pahl, G., Pasztor, J. R., Pater, G. N., Patrick, J. E., Pilcher, J., Pinfold, D. E., Plane, B., Poli, J., Polok, O., Pooth, A., Quadt, K., Rabbertz, C., Rembser, P., Renkel, H., Rick, J. M., Roney, S., Rosati, Y., Rozen, K., Runge, D. R., Rust, K., Sach, T., Saeki, O., Sahr, E. K., G., A. D., Schaile, O., Schaile, P., Scharff Hansen, M., Schroder, M., Schumacher, C., Schwick, W. G., Scott, R., Seuster, T. G., Shear, B. C., Shen, C. H., Shepherd Themistocleou, P., Sherwood, G., Siroli, A., Skuja, A. M., Smith, R., Sobie, S., Soldner Rembold, Spagnolo, Stefania Antonia, F., Spano, A., Stahl, K., Stephen, D., Strom, R., Strohmer, S., Tarem, M., Tasevsky, R. J., Taylor, R., Teuscher, M. A., Thomson, E., Torrence, D., Toya, P., Tran, T., Trefzger, A., Tricoli, I., Trigger, Z., Trocsanyi, E., Tsur, M. F., Turner Watson, I., Ueda, B., Ujvari, B., Vachon, C. F., Vollmer, P., Vannerem, M., Verzocchi, H., Vo, J., Vossebeld, D., Waller, C. P., Ward, D. R., Ward, P. M., Watkin, A. T., Watson, N. K., Watson, P. S., Well, T., Wengler, N., Werme, D., Wetterling, G. W., Wilson, J. A., Wilson, T. R., Wyatt, S., Yamashita, V., Zacek, D., Zer Zion, and OPAL Collaboration

Subjects
Quantum chromodynamics, Physics, Particle physics, Nuclear and High Energy Physics, Photon, Scattering, Hadron, Gamma ray, Function (mathematics), Deep inelastic scattering, Particle Physics - Experiment, Photon structure function
Abstract

The hadronic structure of the photon F2gamma is measured as a function of Bjorken x and of the photon virtuality Q2 using deep-inelastic scattering data taken by the OPAL detector at LEP at e+e- centre-of-mass energies from 183 to 209 GeV. Previous OPAL measurements of the x dependence of F2gamma are extended to an average Q2 of =780GeV2 using data in the kinematic range 0.15 < x < 0.98. The Q2 evolution of F2gamma is studied for 12.1 < < 780GeV2 using three ranges of x. As predicted by QCD, the data show positive scaling violations in F2gamma for the central x region 0.10-0.60. Several parameterisations of F2gamma are in qualitative agreement with the measurements whereas the quark-parton model prediction fails to describe the data. The hadronic structure function of the photon F 2 γ ( x , Q 2 ) is measured as a function of Bjorken x and of the photon virtuality Q 2 using deep-inelastic scattering data taken by the OPAL detector at LEP at e + e − centre-of-mass energies from 183 to 209 GeV. Previous OPAL measurements of the x dependence of F 2 γ are extended to an average Q 2 of 〈 Q 2 〉=780 GeV 2 using data in the kinematic range 0.15< x =780GeV2 using data in the kinematic range 0.15 < x < 0.98. The Q2 evolution of F2gamma is studied for 12.1 < < 780GeV2 using three ranges of x. As predicted by QCD, the data show positive scaling violations in F2gamma for the central x region 0.10-0.60. Several parameterisations of F2gamma are in qualitative agreement with the measurements whereas the quark-parton model prediction fails to describe the data.

Published
2002
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31. Search for doubly charged Higgs bosons with the OPAL detector at LEP

Author

Abbiendi, G., Ainsley, C., Åkesson, P. F., Alexander, G., Allison, J., Anagnostou, G., Anderson, K. J., Arcelli, S., Asai, S., Axen, D., Azuelos, G., Bailey, I., Barberio, E., Barlow, R. J., Batley, R. J., Bechtle, P., Behnke, T., Bell, K. W., Bell, P. J., Bella, G., Bellerive, A., Benelli, G., Bethke, S., Biebel, O., Bloodworm, I. J., Boeriu, O., Bock, P., Böhme, J., Bonacorsi, D., Boutemeur, M., Braibant, S., Brigliadori, L., Brown, R. M., Burckhart, H. J., Cammin, J., Campana, S., Carnegie, R. K., Caron, B., Carter, A. A., Carter, J. R., Chang, C. Y., Charlton, D. G., Clarke, P. E. L., Clay, E., Cohen, I., Couchman, J., Csilling, A., Cuffiani, M., Dado, S., Dallavalle, G. M., Dallison, S., Roeck, A., Woif, E. A., Dervan, P., Desch, K., Dienes, B., Donkers, M., Dubbert, J., Duchovni, E., Duckeck, G., Duerdoth, I. P., Etzion, E., Fabbri, F., Feld, L., Ferrari, P., Fiedler, F., Fleck, I., Ford, M., Frey, A., Fürtjes, A., Futyan, D. I., Gagnon, P., Gary, J. W., Gaycken, G., Geich-Gimbel, C., Giacomelli, G., Paolo Giacomelli, Giunta, M., Goldberg, J., Graham, K., Gross, E., Grunhaus, J., Gruwé, M., Günther, P. O., Gupta, A., Hajdu, C., Hamann, M., Hanson, G. G., Harder, K., Harel, A., Harin-Dirac, M., Hauschild, M., Hauschildt, J., Hawkes, C. M., Hawkings, R., Hemingways, R. J., Hensel, C., Herten, G., Heuer, R. D., Hill, J. C., Hoffman, K., Homer, R. J., Horváth, D., Hossain, K. R., Howard, R., Huntemeyer, P., Igo-Kemenes, P., Ishii, K., Jawahery, A., Jeremie, H., Jones, C. R., Jovanovic, P., Junk, T. R., Kanaya, N., Kanzaki, J., Karapetian, G., Karlen, D., Kartvelishvili, V., Kawagoe, K., Kawamoto, T., Keeler, R. K., Kellogg, R. G., Kennedy, B. W., Kimr, D. H., Kleine, K., Klier, A., Kluth, S., Kobayashi, T., Kobel, M., Kokott, T. P., Komamiya, S., Kowalewski, R. V., Krämer, T., Kress, T., Krieger, P., Krogh, J., Krop, D., Kuhl, T., Küpper, M., Kyberd, P., Lafferty, G. D., Landsman, H., Lanske, D., Lawson, I., Layter, J. G., Leins, A., Lellouch, D., Letts, J., Levinson, L., Lillich, J., Littlewood, C., Lloyd, S. L., Loebinger, F. K., Lu, J., Ludwig, J., Macchiolo, A., Macpherson, A., Mader, W., Marcellini, S., Marchant, T. E., Martin, A. J., Martin, J. P., Martinez, G., Masetti, G., Mashimo, T., Mättig, P., Mcdonald, W. J., Mckenna, J., Mcmahon, T. J., Mcpherson, R. A., Meijers, F., Mendez-Lorenzo, P., Menges, W., Merritt, E. S., Mes, H., Michelini, A., Mihara, S., Mikenberg, G., Miller, D. J., Moed, S., Mohr, W., Mori, T., Mutter, A., Nagai, K., Nakamura, I., Neal, H. A., Nisius, R., O Neale, S. W., Oh, A., Okpara, A., Oreglia, M. J., Orito, S., Pahl, C., Pásztor, G., Pater, J. R., Patrick, G. N., Pilcher, J. E., Pinfold, J., Plane, D. E., Poli, B., Polok, J., Pooth, O., Quadt, A., Rabbertz, K., Rembser, C., Renkel, P., Rick, H., Rodning, N., Roney, J. M., Rosati, S., Roscoe, K., Rozen, Y., Runge, K., Rust, D. R., Sachs, K., Saeki, T., Sahr, O., Sarkisyan, E. K. G., Schaue, A. D., Schaue, O., Scharff-Hansen, P., Schröder, M., Schumacher, M., Schwick, C., Scott, W. G., Seuster, R., Shears, T. G., Shen, B. C., Shepherd-Themistocleous, C. H., Sherwood, P., Skuja, A., Smith, A. M., Snow, G. A., Sobie, R., Söldner-Rembold, S., Spagnolo, S., Spano, F., Sproston, M., Stahl, A., Stephens, K., Strom, D., Ströhmer, R., Stumpf, L., Surrow, B., Tarem, S., Tasevsky, M., Taylor, R. J., Teuscher, R., Thomas, J., Thomson, M. A., Torrence, E., Toya, D., Trefzger, T., Tricoli, A., Trigger, I., Trócsányi, Z., Tsur, E., Turner-Watson, M. F., Ueda, I., Ujvári, B., Vachon, B., Vollmer, C. F., Vannerem, P., Verzocchi, M., Voss, H., Vossebeld, J., Waller, D., Ward, C. P., Ward, D. R., Watkins, P. M., Watson, A. T., Watson, N. K., Wells, P. S., Wengler, T., Wermes, N., Weiterung, D., Wilson, G. W., Wilson, J. A., Wyatt, T. R., Yamashita, S., Zacek, V., Zer-Zion, D., G., Abbiendi, C., Ainsley, P. F., Akesson, G., Alexander, J., Allison, G., Anagnostou, K. J., Anderson, S., Arcelli, S., Asai, D., Axen, G., Azuelo, I., Bailey, E., Barberio, R. J., Barlow, R. J., Batley, P., Bechtle, T., Behnke, K. W., Bell, P. J., Bell, G., Bella, A., Bellerive, G., Benelli, S., Bethke, O., Biebel, I. J., Bloodworth, O., Boeriu, P., Bock, J., Bohme, D., Bonacorsi, M., Boutemeur, S., Braibant, L., Brigliadori, R. M., Brown, H. J., Burckhart, J., Cammin, S., Campana, R. K., Carnegie, B., Caron, A. A., Carter, J. R., Carter, C. Y., Chang, D. G., Charlton, P. E., L., E., Clay, I., Cohen, J., Couchmann, A., Csilling, M., Cuffiani, S., Dado, G. M., Dallavalle, S., Dallison, A., De Roeck, E. A., De, P., Dervan, K., Desch, B., Diene, M., Donker, J., Dubbert, E., Duchovni, G., Duckeck, I. P., Duerdoth, E., Etzion, F., Fabbri, L., Feld, P., Ferrari, F., Fiedler, I., Fleck, M., Ford, A., Frey, A., Furtje, D. I., Futyan, P., Gagnon, J. W., Gary, G., Gaycken, C., Geich Gimbel, G., Giacomelli, P., Giacomelli, M., Giunta, J., Goldberg, K., Graham, E., Gro, J., Grunhau, M., Gruwe, P. O., Gunther, A., Gupta, C., Hajdu, M., Hamann, G. G., Hanson, K., Harder, A., Harel, M., Harin Dirac, M., Hauschild, J., Hauschildt, C. M., Hawke, R., Hawking, R. J., Hemingway, C., Hensel, G., Herten, R. D., Heuer, J. C., Hill, K., Hoffman, R. J., Homer, D., Horvath, K. R., Hossain, R., Howard, P., Huntemeyer, P., Igo Kemene, K., Ishii, A., Jawahery, H., Jeremie, C. R., Jone, P., Jovanovic, T. R., Junk, N., Kanaya, J., Kanzaki, G., Karapetian, D., Karlen, V., Kartvelishvili, K., Kawagoe, T., Kawamoto, R. K., Keeler, R. G., Kellogg, B. W., Kennedy, D. H., Kim, K., Klein, A., Klier, S., Kluth, T., Kobayashi, M., Kobel, T. P., Kokott, S., Komamiya, R. V., Kowalewski, T., Kramer, T., Kre, P., Krieger, J., von Krogh, D., Krop, T., Kuhl, M., Kupper, P., Kyberd, G. D., Lafferty, H., Landsman, D., Lanske, I., Lawson, J. G., Layter, A., Lein, D., Lellouch, J., Lett, L., Levinson, J., Lillich, C., Littlewood, S. L., Lloyd, F. K., Loebinger, J., Lu, J., Ludwig, A., Macchiolo, A., Macpherson, W., Mader, S., Marcellini, T. E., Marchant, A. J., Martin, J. P., Martin, G., Martinez, G., Masetti, T., Mashimo, P., Mattig, W. J., Mcdonald, J., Mckenna, T. J., Mcmahon, R. A., Mcpherson, F., Meijer, P., Mendez Lorenzo, W., Menge, F. S., Merritt, H., Me, A., Michelini, S., Mihara, G., Mikenberg, D. J., Miller, S., Moed, W., Mohr, T., Mori, A., Mutter, K., Nagai, I., Nakamura, H. A., Neal, R., Nisiu, S. W., O'Neale, A., Oh, A., Okpara, M. J., Oreglia, S., Orito, C., Pahl, G., Pasztor, J. R., Pater, G. N., Patrick, J. E., Pilcher, J., Pinfold, D. E., Plane, B., Poli, J., Polok, O., Pooth, A., Quadt, K., Rabbertz, C., Rembser, P., Renkel, H., Rick, N., Rodning, J. M., Roney, S., Rosati, K., Roscoe, Y., Rozen, K., Runge, D. R., Rust, K., Sach, T., Saeki, O., Sahr, E. K., G., A. D., Schaile, O., Schaile, P., Scharff Hansen, M., Schroder, M., Schumacher, C., Schwick, W. G., Scott, R., Seuster, T. G., Shear, B. C., Shen, C. H., Shepherd Themistocleou, P., Sherwood, A., Skuja, A. M., Smith, G. A., Snow, R., Sobie, S., Soldner Rembold, Spagnolo, Stefania Antonia, F., Spano, M., Sproston, A., Stahl, K., Stephen, D., Strom, R., Strohmer, L., Stumpf, B., Surrow, S., Tarem, M., Tasevsky, R. J., Taylor, R., Teuscher, J., Thoma, M. A., Thomson, E., Torrence, D., Toya, T., Trefzger, A., Tricoli, I., Trigger, Z., Trocsanyi, E., Tsur, M. F., Turner Watson, I., Ueda, B., Ujvari, B., Vachon, C. F., Vollmer, P., Vannerem, M., Verzocchi, H., Vo, J., Vossebeld, D., Waller, C. P., Ward, D. R., Ward, P. M., Watkin, A. T., Watson, N. K., Watson, P. S., Well, T., Wengler, N., Werme, D., Wetterling, G. W., Wilson, J. A., Wilson, T. R., Wyatt, S., Yamashita, V., Zacek, D., Zer Zion, and OPAL Collaboration

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Detector, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment, Boson
Abstract

A search for pair-produced doubly charged Higgs bosons has been performed using data samples corresponding to an integrated luminosity of about 614 pb-1 collected with the OPAL detector at LEP at centre-of-mass energies between 189GeV and 209GeV. No evidence for a signal has been observed. A mass limit of 98.5GeV/c2 at the 95% confidence level has been set for the doubly charged Higgs particle in left-right symmetric models. This is the first search for doubly charged Higgs bosons at centre-of-mass energies larger than 91GeV., Comment: 19 pages, 4 figures, Submitted to Phys. Lett. B

Published
2002
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32. Search for leptoquarks in electron–photon scattering at up to 209 GeV at LEP

Author

G. Abbiendi, C. Ainsley, P.F. Åkesson, G. Alexander, J. Allison, G. Anagnostou, K.J. Anderson, S. Arcelli, S. Asai, D. Axen, G. Azuelos, I. Bailey, E. Barberio, R.J. Barlow, R.J. Batley, P. Bechtle, T. Behnke, K.W. Bell, P.J. Bell, G. Bella, A. Bellerive, G. Benelli, S. Bethke, O. Biebel, I.J. Bloodworth, O. Boeriu, P. Bock, J. Böhme, D. Bonacorsi, M. Boutemeur, S. Braibant, L. Brigliadori, R.M. Brown, H.J. Burckhart, J. Cammin, S. Campana, R.K. Carnegie, B. Caron, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, P.E.L. Clarke, E. Clay, I. Cohen, J. Couchman, A. Csilling, M. Cuffiani, S. Dado, G.M. Dallavalle, S. Dallison, A. De Roeck, E.A. De Wolf, P. Dervan, K. Desch, B. Dienes, M. Donkers, J. Dubbert, E. Duchovni, G. Duckeck, I.P. Duerdoth, E. Etzion, F. Fabbri, L. Feld, P. Ferrari, F. Fiedler, I. Fleck, M. Ford, A. Frey, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, M. Giunta, J. Goldberg, K. Graham, E. Gross, J. Grunhaus, M. Gruwé, P.O. Günther, A. Gupta, C. Hajdu, M. Hamann, G.G. Hanson, K. Harder, A. Harel, M. Harin-Dirac, M. Hauschild, J. Hauschildt, C.M. Hawkes, R. Hawkings, R.J. Hemingway, C. Hensel, G. Herten, R.D. Heuer, J.C. Hill, K. Hoffman, R.J. Homer, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, K. Ishii, A. Jawahery, H. Jeremie, C.R. Jones, P. Jovanovic, T.R. Junk, N. Kanaya, J. Kanzaki, G. Karapetian, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, D.H. Kim, K. Klein, A. Klier, S. Kluth, T. Kobayashi, M. Kobel, T.P. Kokott, S. Komamiya, L. Kormos, R.V. Kowalewski, T. Krämer, T. Kress, P. Krieger, J. von Krogh, D. Krop, T. Kuhl, M. Kupper, P. Kyberd, G.D. Lafferty, H. Landsman, D. Lanske, I. Lawson, J.G. Layter, A. Leins, D. Lellouch, J. Letts, L. Levinson, J. Lillich, C. Littlewood, S.L. Lloyd, F.K. Loebinger, J. Lu, J. Ludwig, A. Macchiolo, A. Macpherson, W. Mader, S. Marcellini, T.E. Marchant, A.J. Martin, J.P. Martin, G. Martinez, G. Masetti, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, T.J. McMahon, R.A. McPherson, F. Meijers, P. Mendez-Lorenzo, W. Menges, F.S. Merritt, H. Mes, A. Michelini, S. Mihara, G. Mikenberg, D.J. Miller, S. Moed, W. Mohr, T. Mori, A. Mutter, K. Nagai, I. Nakamura, H.A. Neal, R. Nisius, S.W. O'Neale, A. Oh, A. Okpara, M.J. Oreglia, S. Orito, C. Pahl, G. Pásztor, J.R. Pater, G.N. Patrick, J.E. Pilcher, J. Pinfold, D.E. Plane, B. Poli, J. Polok, O. Pooth, A. Quadt, K. Rabbertz, C. Rembser, P. Renkel, H. Rick, N. Rodning, J.M. Roney, S. Rosati, K. Roscoe, Y. Rozen, K. Runge, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, E.K.G. Sarkisyan, A.D. Schaile, O. Schaile, P. Scharff-Hansen, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, F. Spano, M. Sproston, A. Stahl, K. Stephens, D. Strom, R. Ströhmer, B. Surrow, S. Tarem, M. Tasevsky, R.J. Taylor, R. Teuscher, J. Thomas, M.A. Thomson, E. Torrence, D. Toya, T. Trefzger, A. Tricoli, I. Trigger, Z. Trócsányi, E. Tsur, M.F. Turner-Watson, I. Ueda, B. Ujvári, B. Vachon, C.F. Vollmer, P. Vannerem, M. Verzocchi, H. Voss, J. Vossebeld, D. Waller, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, T. Wengler, N. Wermes, D. Wetterling, G.W. Wilson, J.A. Wilson, T.R. Wyatt, S. Yamashita, V. Zacek, and D. Zer-Zion

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, Scalar (mathematics), Supersymmetry, Electron, 01 natural sciences, First generation, Standard Model, 0103 physical sciences, High Energy Physics::Experiment, Leptoquark, 010306 general physics, Photon scattering
Abstract

Searches for first generation scalar and vector leptoquarks, and for squarks in R-parity violating SUSY models with the direct decay of the squark into Standard Model particles, have been performed using e+e- collisions collected with the OPAL detector at LEP at e+e- centre-of-mass energies between 189 and 209 GeV. No excess of events is found over the expectation from Standard Model background processes. Limits are computed on the leptoquark couplings for different values of the branching ratio to electron-quark final states.

Published
2002
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33. Measurement of the branching ratio for →τ decays

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, Hadron, 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Exponential decay, Nuclear Experiment, 010306 general physics
Abstract

Using about 3.9 million hadronic Z decays from e + e − collisions recorded by the OPAL detector at LEP at centre-of-mass energies s ≈M Z , the branching ratio for the decay D − s →τ − ν τ has been measured to be BR ( D − s →τ − ν τ )=(7.0±2.1( stat )±2.0( syst ))%. This result can be used to derive the decay constant of the D − s meson: f D s =(286±44( stat )±41( syst )) MeV .

Published
2001
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34. Angular analysis of the muon pair asymmetry at LEP 1

Author

G. Abbiendi, C. Ainsley, P.F. Åkesson, G. Alexander, J. Allison, G. Anagnostou, K.J. Anderson, S. Arcelli, S. Asai, D. Axen, G. Azuelos, I. Bailey, E. Barberio, R.J. Barlow, R.J. Batley, T. Behnke, K.W. Bell, P.J. Bell, G. Bella, A. Bellerive, S. Bethke, O. Biebel, I.J. Bloodworth, O. Boeriu, P. Bock, J. Böhme, D. Bonacorsi, M. Boutemeur, S. Braibant, L. Brigliadori, R.M. Brown, H.J. Burckhart, J. Cammin, R.K. Carnegie, B. Caron, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, P.E.L. Clarke, E. Clay, I. Cohen, J. Couchman, A. Csilling, M. Cuffiani, S. Dado, G.M. Dallavalle, S. Dallison, A. De Roeck, E.A. De Wolf, P. Dervan, K. Desch, B. Dienes, M.S. Dixit, M. Donkers, J. Dubbert, E. Duchovni, G. Duckeck, I.P. Duerdoth, E. Etzion, F. Fabbri, L. Feld, P. Ferrari, F. Fiedler, I. Fleck, M. Ford, A. Frey, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, D. Glenzinski, J. Goldberg, K. Graham, E. Gross, J. Grunhaus, M. Gruwé, P.O. Günther, A. Gupta, C. Hajdu, M. Hamann, G.G. Hanson, K. Harder, A. Harel, M. Harin-Dirac, M. Hauschild, J. Hauschildt, C.M. Hawkes, R. Hawkings, R.J. Hemingway, C. Hensel, G. Herten, R.D. Heuer, J.C. Hill, K. Hoffman, R.J. Homer, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, K. Ishii, A. Jawahery, H. Jeremie, C.R. Jones, P. Jovanovic, T.R. Junk, N. Kanaya, J. Kanzaki, G. Karapetian, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, D.H. Kim, K. Klein, A. Klier, S. Kluth, T. Kobayashi, M. Kobel, T.P. Kokott, S. Komamiya, R.V. Kowalewski, T. Krämer, T. Kress, P. Krieger, J. von Krogh, D. Krop, T. Kuhl, M. Kupper, P. Kyberd, G.D. Lafferty, H. Landsman, D. Lanske, I. Lawson, J.G. Layter, A. Leins, D. Lellouch, J. Letts, L. Levinson, J. Lillich, C. Littlewood, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Lu, J. Ludwig, A. Macchiolo, A. Macpherson, W. Mader, S. Marcellini, T.E. Marchant, A.J. Martin, J.P. Martin, G. Martinez, G. Masetti, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, T.J. McMahon, R.A. McPherson, F. Meijers, P. Mendez-Lorenzo, W. Menges, F.S. Merritt, H. Mes, A. Michelini, S. Mihara, G. Mikenberg, D.J. Miller, S. Moed, W. Mohr, T. Mori, A. Mutter, K. Nagai, I. Nakamura, H.A. Neal, R. Nisius, S.W. O'Neale, A. Oh, A. Okpara, M.J. Oreglia, S. Orito, C. Pahl, G. Pásztor, J.R. Pater, G.N. Patrick, J.E. Pilcher, J. Pinfold, D.E. Plane, B. Poli, J. Polok, O. Pooth, A. Quadt, K. Rabbertz, C. Rembser, P. Renkel, H. Rick, N. Rodning, J.M. Roney, S. Rosati, K. Roscoe, Y. Rozen, K. Runge, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, P. Scharff-Hansen, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, F. Spano, M. Sproston, A. Stahl, K. Stephens, D. Strom, R. Ströhmer, L. Stumpf, B. Surrow, S. Tarem, M. Tasevsky, R.J. Taylor, R. Teuscher, J. Thomas, M.A. Thomson, E. Torrence, D. Toya, T. Trefzger, A. Tricoli, I. Trigger, Z. Trócsányi, E. Tsur, M.F. Turner-Watson, I. Ueda, B. Ujvári, B. Vachon, C.F. Vollmer, P. Vannerem, M. Verzocchi, H. Voss, J. Vossebeld, D. Waller, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, T. Wengler, N. Wermes, D. Wetterling, G.W. Wilson, J.A. Wilson, T.R. Wyatt, S. Yamashita, V. Zacek, D. Zer-Zion, G., Abbiendi, C., Ainsley, P. F., Akesson, G., Alexander, J., Allison, G., Anagnostou, K. J., Anderson, S., Arcelli, S., Asai, D., Axen, G., Azuelo, I., Bailey, E., Barberio, R. J., Barlow, R. J., Batley, T., Behnke, K. W., Bell, P. J., Bell, G., Bella, A., Bellerive, S., Bethke, O., Biebel, I. J., Bloodworth, O., Boeriu, P., Bock, J., Bohme, D., Bonacorsi, M., Boutemeur, S., Braibant, L., Brigliador, R. M., Brown, H. J., Burckhart, J., Cammin, R. K., Carnegie, B., Caron, A. A., Carter, J. R., Carter, C. Y., Chang, D. G., Charlton, P. E., L., E., Clay, I., Cohen, J., Couchman, A., Csilling, M., Cuffiani, S., Dado, G. M., Dallavalle, S., Dallison, A., De Roeck, E. A., De, P., Dervan, K., Desch, B., Diene, M. S., Dixit, M., Donker, J., Dubbert, E., Duchovni, G., Duckeck, I. P., Duerdoth, E., Etzion, F., Fabbri, L., Feld, P., Ferrari, F., Fiedler, I., Fleck, M., Ford, A., Frey, A., Furtje, D. I., Futyan, P., Gagnon, J. W., Gary, G., Gaycken, C., Geich Gimbel, G., Giacomelli, P., Giacomelli, D., Glenzinski, J., Goldberg, K., Graham, E., Gro, J., Grunhau, M., Gruwe, P. O., Gunther, A., Gupta, C., Hajdu, M., Hamann, G. G., Hanson, K., Harder, A., Harel, M., Harin Dirac, M., Hauschild, J., Hauschildt, C. M., Hawke, R., Hawking, R. J., Hemingway, C., Hensel, G., Herten, R. D., Heuer, J. C., Hill, K., Hoffman, R. J., Homer, D., Horvath, K. R., Hossain, R., Howard, P., Huntemeyer, P., Igo Kemene, K., Ishii, A., Jawahery, H., Jeremie, C. R., Jone, P., Jovanovic, T. R., Junk, N., Kanaya, J., Kanzaki, G., Karapetian, D., Karlen, V., Kartvelishvili, K., Kawagoe, T., Kawamoto, R. K., Keeler, R. G., Kellogg, B. W., Kennedy, D. H., Kim, K., Klein, A., Klier, S., Kluth, T., Kobayashi, M., Kobel, T. P., Kokott, S., Komamiya, R. V., Kowalewski, T., Kramer, T., Kre, P., Krieger, J., van Krogh, D., Krop, T., Kuhl, M., Kupper, P., Kyberd, G. D., Lafferty, H., Landsman, D., Lanske, I., Lawson, J. G., Layter, A., Lein, D., Lellouch, J., Lett, L., Levinson, J., Lillich, C., Littlewood, S. L., Lloyd, F. K., Loebinger, G. D., Long, M. J., Losty, J., Lu, J., Ludwig, A., Macchiolo, A., Macpherson, W., Mader, S., Marcellini, T. E., Marchant, A. J., Martin, J. P., Martin, G., Martinez, G., Masetti, T., Mashimo, P., Mattig, W. J., Mcdonald, J., Mckenna, T. J., Mcmahon, R. A., Mcpherson, F., Meijer, P., Mendez Lorenzo, W., Menge, F. S., Merritt, H., Me, A., Michelini, S., Mihara, G., Mikenberg, D. J., Miller, S., Moed, W., Mohr, T., Mori, A., Mutter, K., Nagai, I., Nakamura, H. A., Neal, R., Nisiu, S. W., O'Neale, A., Oh, A., Okpara, M. J., Oreglia, S., Orito, C., Pahl, G., Pasztor, J. R., Pater, G. N., Patrick, J. E., Pilcher, J., Pinfold, D. E., Plane, B., Poli, J., Polok, O., Pooth, A., Quadt, K., Rabbertz, C., Rembser, P., Renkel, H., Rick, N., Rodning, J. M., Roney, S., Rosati, K., Roscoe, Y., Rozen, K., Runge, D. R., Rust, K., Sach, T., Saeki, O., Sahr, E. K., G., C., Sbarra, A. D., Schaile, O., Schaile, P., Scharff Hansen, M., Schroder, M., Schumacher, C., Schwick, W. G., Scott, R., Seuster, T. G., Shear, B. C., Shen, C. H., Shepherd Themistocleou, P., Sherwood, A., Skuja, A. M., Smith, G. A., Snow, R., Sobie, S., Soldner Rembold, Spagnolo, Stefania Antonia, F., Spano, M., Sproston, A., Stahl, K., Stephen, D., Strom, R., Strohmer, L., Stumpf, B., Surrow, S., Tarem, M., Tasevsky, R. J., Taylor, R., Teuscher, J., Thoma, M. A., Thomson, E., Torrence, D., Toya, T., Trefzger, A., Tricoli, I., Trigger, Z., Trocsanyi, E., Tsur, M. F., Turner Watson, I., Ueda, B., Ujvari, B., Vachon, C. F., Vollmer, P., Vannerem, M., Verzocchi, H., Vo, J., Vossebeld, D., Waller, C. P., Ward, D. R., Ward, P. M., Watkin, A. T., Watson, N. K., Watson, P. S., Well, T., Wengler, N., Werme, D., Wetterling, G. W., Wilson, J. A., Wilson, T. R., Wyatt, S., Yamashita, V., Zacek, D., Zer Zion, and OPAL Collaboration

Subjects
Physics, Particle physics, Nuclear and High Energy Physics, Muon, 010308 nuclear & particles physics, media_common.quotation_subject, Photon radiation, FOS: Physical sciences, Radiation, Interference (wave propagation), 01 natural sciences, Asymmetry, Standard Model, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Pair production, 0103 physical sciences, Invariant mass, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment, media_common
Abstract

Data on muon pair production obtained by the OPAL collaboration at centre of mass energies near the Z peak are analysed. Small angular mismatches between the directions of the two muons are used to assess the effects of initial state photon radiation and initial-final-state radiation interference on the forward-backward asymmetry of muon pairs. The dependence of the asymmetry on the invariant mass of the pair is measured in a model-independent way. Effective vector and axial-vector couplings of the Z boson are determined and compared to the Standard Model expectations., 31 pages, 8 figures, Accepted by Physics Letters B

Published
2001
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35. Measurement of the mass and width of the W boson in e+e− collisions at 189 GeV

Author

Abbiendi, G., Ackerstaff, K., Ainsley, C., Akesson, P.F., Alexander, G., Allison, John, Anderson, K.J., Arcelli, S., Asai, S., Ashby, S.F., Axen, D., Azuelos, G., Bailey, I., Ball, A.H., Barberio, E., Barlow, Roger J., Baumann, S., Behnke, T., Bell, Kenneth Watson, Bella, G., Bellerive, A., Benelli, G., Bentvelsen, S., Bethke, S., Biebel, O., Bloodworth, I.J., Boeriu, O., Bock, P., Bohme, J., Bonacorsi, D., Boutemeur, M., Braibant, S., Bright-Thomas, P., Brigliadori, L., Brown, Robert M., Burckhart, H.J., Cammin, J., Capiluppi, P., Carnegie, R.K., Carter, A.A., Carter, J.R., Chang, C.Y., Charlton, David G., Clarke, P.E.L., Clay, E., Cohen, I., Cooke, O.C., Couchman, J., Couyoumtzelis, C., Coxe, R.L., Csilling, A., Cuffiani, M., Dado, S., Dallavalle, G.Marco, Dallison, S., de Roeck, A., de Wolf, E., Dervan, P., Desch, K., Dienes, B., Dixit, M.S., Donkers, M., Dubbert, J., Duchovni, E., Duckeck, G., Duerdoth, I.P., Estabrooks, P.G., Etzion, E., Fabbri, F., Fanti, M., Feld, L., Ferrari, P., Fiedler, F., Fleck, I., Ford, M., Frey, A., Furtjes, A., Futyan, D.I., Gagnon, P., Gary, J.W., Gaycken, G., Geich-Gimbel, C., Giacomelli, G., Giacomelli, P., Glenzinski, D., Goldberg, J., Grandi, C., Graham, K., Gross, E., Grunhaus, J., Gruwe, M., Gunther, P.O., Hajdu, C., Hanson, G.G., Hansroul, M., Hapke, M., Harder, K., Harel, A., Harin-Dirac, M., Hauke, A., Hauschild, M., Hawkes, C.M., Hawkings, R., Hemingway, R.J., Hensel, C., Herten, G., Heuer, R.D., Hill, J.C., Hocker, James Andrew, Hoffman, Kara Dion, Homer, R.J., Honma, A.K., Horvath, D., Hossain, K.R., Howard, R., Huntemeyer, P., Igo-Kemenes, P., Ishii, K., Jacob, F.R., Jawahery, A., Jeremie, H., Jones, C.R., Jovanovic, P., Junk, T.R., Kanaya, N., Kanzaki, J., Karapetian, G., Karlen, D., Kartvelishvili, V., Kawagoe, K., Kawamoto, T., Keeler, R.K., Kellogg, R.G., Kennedy, B.W., Kim, D.H., Klein, K., Klier, A., Kluth, S., Kobayashi, T., Kobel, M., Kokott, T.P., Komamiya, S., Kowalewski, Robert V., Kress, T., Krieger, P., von Krogh, J., Kuhl, T., Kupper, M., Kyberd, P., Lafferty, G.D., Landsman, H., Lanske, D., Lawson, I., Layter, J.G., Leins, A., Lellouch, D., Letts, J., Levinson, L., Liebisch, R., Lillich, J., List, B., Littlewood, C., Lloyd, A.W., Lloyd, S.L., Loebinger, F.K., Long, G.D., Losty, M.J., Lu, J., Ludwig, J., Macchiolo, A., Macpherson, A., Mader, W., Marcellini, S., Marchant, T.E., Martin, A.J., Martin, J.P., Martinez, G., Mashimo, T., Mattig, Peter, McDonald, W.John, McKenna, J., McMahon, T.J., McPherson, R.A., Meijers, F., Mendez-Lorenzo, P., Menges, W., Merritt, F.S., Mes, H., Michelini, A., Mihara, S., Mikenberg, G., Miller, D.J., Mohr, W., Montanari, A., Mori, T., Nagai, K., Nakamura, I., Neal, H.A., Nisius, R., O'Neale, S.W., Oakham, F.G., Odorici, F., Ogren, H.O., Oh, A., Okpara, A., Oreglia, M.J., Orito, S., Pasztor, G., Pater, J.R., Patrick, G.N., Patt, J., Pfeifenschneider, P., Pilcher, J.E., Pinfold, J., Plane, David E., Poli, B., Polok, J., Pooth, O., Przybycien, M., Quadt, A., Rembser, C., Renkel, P., Rick, H., Rodning, N., Roney, J.M., Rosati, S., Roscoe, K., Rossi, A.M., Rozen, Y., Runge, K., Runolfsson, O., Rust, D.R., Sachs, K., Saeki, T., Sahr, O., Sarkisyan, E.K.G., Sbarra, C., Schaile, A.D., Schaile, O., Scharff-Hansen, P., Schroder, Matthias, Schumacher, M., Schwick, C., Scott, W.G., Seuster, R., Shears, T.G., Shen, B.C., Shepherd-Themistocleous, C.H., Sherwood, P., Siroli, G.P., Skuja, A., Smith, A.M., Snow, G.A., Sobie, R., Soldner-Rembold, S., Spagnolo, S., Sproston, M., Stahl, A., Stephens, K., Stoll, K., Strom, David M., Strohmer, R., Stumpf, L., Surrow, B., Talbot, S.D., Tarem, S., Taylor, R.J., Teuscher, R., Thiergen, M., Thomas, J., Thomson, M.A., Torrence, E., Towers, S., Toya, D., Trefzger, T., Trigger, I., Trocsanyi, Z., Tsur, E., Turner-Watson, M.F., Ueda, I., Vachon, B., Vannerem, P., Verzocchi, M., Voss, H., Vossebeld, J., Waller, D., Ward, C.P., Ward, D.R., Watkins, P.M., Watson, A.T., Watson, N.K., Wells, P.S., Wengler, T., Wermes, N., Wetterling, D., White, J.S., Wilson, G.W., Wilson, J.A., Wyatt, T.R., Yamashita, S., Zacek, V., Zer-Zion, D., G., Abbiendi, K., Ackerstaff, C., Ainsley, P. F., Akesson, G., Alexander, J., Allison, K. J., Anderson, S., Arcelli, S., Asai, S. F., Ashby, D., Axen, G., Azuelo, I., Bailey, A. H., Ball, E., Barberio, R. J., Barlow, S., Baumann, T., Behnke, K. W., Bell, G., Bella, A., Bellerive, G., Benelli, S., Bentvelsen, S., Bethke, O., Biebel, I. J., Bloodworth, O., Boeriu, P., Bock, J., Bohme, D., Bonacorsi, M., Boutemeur, S., Braibant, P., Bright Thoma, L., Brigliadori, R. M., Brown, H. J., Burckhart, J., Cammin, P., Capiluppi, R. K., Carnegie, A. A., Carter, J. R., Carter, C. Y., Chang, D. G., Charlton, P. E., L., E., Clay, I., Cohen, O. C., Cooke, J., Couchman, C., Couyoumtzeli, R. L., Coxe, A., Csilling, M., Cuffiani, S., Dado, G. M., Dallavalle, S., Dallison, A., de Roeck, E., de Wolf, P., Dervan, K., Desch, B., Diene, M. S., Dixit, M., Donker, J., Dubbert, E., Duchovni, G., Duckeck, I. P., Duerdoth, P. G., Estabrook, E., Etzion, F., Fabbri, M., Fanti, L., Feld, P., Ferrari, F., Fiedler, I., Fleck, M., Ford, A., Frey, A., Furtje, D. I., Futyan, P., Gagnon, J. W., Gary, G., Gaycken, C., Geich Gimbel, G., Giacomelli, P., Giacomelli, D., Glenzinski, J., Goldberg, C., Grandi, K., Graham, E., Gro, J., Grunhau, M., Gruwe, P. O., Gunther, C., Hajdu, G. G., Hanson, M., Hansroul, M., Hapke, K., Harder, A., Harel, M., Harin Dirac, A., Hauke, M., Hauschild, C. M., Hawke, R., Hawking, R. J., Hemingway, C., Hensel, G., Herten, R. D., Heuer, J. C., Hill, A., Hocker, K., Hoffman, R. J., Homer, A. K., Honma, D., Horvath, K. R., Hossain, R., Howard, P., Huntemeyer, P., Igo Kemene, K., Ishii, F. R., Jacob, A., Jawahery, H., Jeremie, C. R., Jone, P., Jovanovic, T. R., Junk, N., Kanaya, J., Kanzaki, G., Karapetian, D., Karlen, V., Kartvelishvili, K., Kawagoe, T., Kawamoto, R. K., Keeler, R. G., Kellogg, B. W., Kennedy, D. H., Kim, K., Klein, A., Klier, S., Kluth, T., Kobayashi, M., Kobel, T. P., Kokott, S., Komamiya, R. V., Kowalewski, T., Kre, P., Krieger, J., von Krogh, T., Kuhl, M., Kupper, P., Kyberd, G. D., Lafferty, H., Landsman, D., Lanske, I., Lawson, J. G., Layter, A., Lein, D., Lellouch, J., Lett, L., Levinson, R., Liebisch, J., Lillich, B., List, C., Littlewood, A. W., Lloyd, S. L., Lloyd, F. K., Loebinger, G. D., Ling, M. J., Losty, J., Lu, J., Ludwig, A., Macchiolo, A., Macpherson, W., Mader, S., Marcellini, T. E., Marchant, A. J., Martin, J. P., Martin, G., Martinez, T., Mashimo, P., Mattig, W. J., Mcdonald, J., Mckenna, T. J., Mcmahon, R. A., Mcpherson, F., Meijer, P., Mendez Lorenzo, W., Menge, F. S., Merritt, H., Me, A., Michelini, S., Mihara, G., Mikenberg, D. J., Miller, W., Mohr, A., Montanari, T., Mori, K., Nagai, I., Nakamura, H. A., Neal, R., Nisiu, S. W., O'Neale, F. G., Oakham, F., Odorici, H. O., Ogren, A., Oh, A., Okpara, M. J., Oreglia, S., Orito, G., Pasztor, J. R., Pater, G. N., Patrick, J., Patt, P., Pfeifenschneider, J. E., Pilcher, J., Pinfold, D. E., Plane, B., Poli, J., Polok, O., Pooth, M., Przybycien, A., Quadt, C., Rembser, P., Renkel, H., Rick, N., Rodning, J. M., Roney, S., Rosati, K., Roscoe, A. M., Rossi, Y., Rozen, K., Runge, O., Runolfsson, D. R., Rust, K., Sach, T., Saeki, O., Sahr, E. K., G., C., Sbarra, A. D., Schaile, O., Schaile, P., Scharff Hansen, M., Schroder, M., Schumacher, C., Schwick, W. G., Scott, R., Seuster, T. G., Shear, B. C., Shen, C. H., Shepherd Themistocleou, P., Sherwood, G. P., Siroli, A., Skuja, A. M., Smith, G. A., Snow, R., Sobie, S., Soldner Rembold, Spagnolo, Stefania Antonia, M., Sproston, A., Stahl, K., Stephen, K., Stoll, D., Strom, R., Strohmer, L., Stumpf, B., Surrow, S. D., Talbot, S., Tarem, R. J., Taylor, R., Teuscher, M., Thiergen, J., Thoma, M. A., Thomson, E., Torrence, S., Tower, D., Toya, T., Trefzger, I., Trigger, Z., Trocsanyi, E., Tsur, M. F., Turner Watson, I., Ueda, B., Vachon, P., Vannerem, M., Verzocchi, H., Vo, J., Vossebeld, D., Waller, C. P., Ward, D. R., Ward, P. M., Watkin, A. T., Watson, N. K., Watson, P. S., Well, T., Wengler, N., Werme, D., Wetterling, J. S., White, G. W., Wilson, J. A., Wilson, T. R., Wyatt, S., Yamashita, V., Zacek, D., Zer Zion, and OPAL Collaboration

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Electroweak interaction, FOS: Physical sciences, 01 natural sciences, 7. Clean energy, High Energy Physics - Experiment, Standard Model, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, 010306 general physics, Particle Physics - Experiment
Abstract

The mass and width of the W boson are determined in e+e- collisions at LEP using 183 pb^-1 of data recorded at a centre-of-mass energy roots=189 GeV with the OPAL detector. The invariant mass distributions from 970 WW->qqqq and 1118 WW->qqln candidate events are used to measure the mass of the W boson, Mw = 80.451 +- 0.076(stat.) +- 0.049(syst.) GeV. A direct measurement of the width of the W boson gives Gw=2.09 +- 0.18(stat.) +- 0.09(syst.) GeV. The results are combined with previous OPAL results from 78 pb^-1 of data recorded with roots from 161 to 183 GeV, to obtain: Mw = 80.432 +- 0.066(stat.) +- 0.045(syst.) GeV, Gw = 2.04 +- 0.16(stat.) +- 0.09(syst.) GeV. The consistency of the direct measurement of Mw with that inferred from other measurements of electroweak parameters provides an important test of the Standard Model of electroweak interactions., 24 pages, 4 figures, submitted to Phys. Lett. B

Published
2001
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36. Measurement of the B0 lifetime and oscillation frequency using →ℓ decays

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Oscillation, 0103 physical sciences, Detector, 010306 general physics, 01 natural sciences
Abstract

The lifetime and oscillation frequency of the B0 meson has been measured using B0->D*+l-v decays recorded on the Z0 peak with the OPAL detector at LEP. The D*+ -> D0pi+ decays were reconstructed using an inclusive technique and the production flavour of the B0 mesons was determined using a combination of tags from the rest of the event. The results t_B0 = 1.541 +- 0.028 +- 0.023 ps, Dm_d = 0.497 +- 0.024 +- 0.025 ps-1 were obtained, where in each case the first error is statistical and the second systematic.

Published
2000
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37. First measurement of the inclusive branching ratio of b hadrons to φ mesons in Z decays

Author

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

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, Branching fraction, High Energy Physics::Phenomenology, Hadron, Detector, High Energy Physics::Experiment, Nuclear Experiment, Production rate
Abstract

The inclusive production rate of phi mesons from the decay of b hadrons produced in Z0 decays was measured to be Br(b->phi+X) = 0.0282+-0.0013(stat.)+-0.0019(syst.), using data collected by the OPAL detector at LEP.

Published
2000
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38. Measurement of |Vcb| using decays

Author

G. Abbiendi, K. Ackerstaff, P.F. Akesson, G. Alexander, J. Allison, K.J. Anderson, S. Arcelli, S. Asai, S.F. Ashby, D. Axen, G. Azuelos, I. Bailey, A.H. Ball, E. Barberio, R.J. Barlow, J.R. Batley, S. Baumann, T. Behnke, K.W. Bell, G. Bella, A. Bellerive, S. Bentvelsen, S. Bethke, O. Biebel, A. Biguzzi, I.J. Bloodworth, P. Bock, J. Böhme, O. Boeriu, D. Bonacorsi, M. Boutemeur, S. Braibant, P. Bright-Thomas, L. Brigliadori, R.M. Brown, H.J. Burckhart, J. Cammin, P. Capiluppi, R.K. Carnegie, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, D. Chrisman, C. Ciocca, P.E.L. Clarke, E. Clay, I. Cohen, O.C. Cooke, J. Couchman, C. Couyoumtzelis, R.L. Coxe, M. Cuffiani, S. Dado, G.M. Dallavalle, S. Dallison, R. Davis, A. de Roeck, P. Dervan, K. Desch, B. Dienes, M.S. Dixit, M. Donkers, J. Dubbert, E. Duchovni, G. Duckeck, I.P. Duerdoth, P.G. Estabrooks, E. Etzion, F. Fabbri, A. Fanfani, M. Fanti, A.A. Faust, L. Feld, P. Ferrari, F. Fiedler, M. Fierro, I. Fleck, A. Frey, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, D.M. Gingrich, D. Glenzinski, J. Goldberg, W. Gorn, C. Grandi, K. Graham, E. Gross, J. Grunhaus, M. Gruwé, P.O. Günther, C. Hajdu, G.G. Hanson, M. Hansroul, M. Hapke, K. Harder, A. Harel, C.K. Hargrove, M. Harin-Dirac, A. Hauke, M. Hauschild, C.M. Hawkes, R. Hawkings, R.J. Hemingway, C. Hensel, G. Herten, R.D. Heuer, M.D. Hildreth, J.C. Hill, P.R. Hobson, A. Hocker, K. Hoffman, R.J. Homer, A.K. Honma, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, D.C. Imrie, K. Ishii, F.R. Jacob, A. Jawahery, H. Jeremie, M. Jimack, C.R. Jones, P. Jovanovic, T.R. Junk, N. Kanaya, J. Kanzaki, G. Karapetian, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, P.I. Kayal, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, D.H. Kim, K. Klein, A. Klier, T. Kobayashi, M. Kobel, T.P. Kokott, M. Kolrep, S. Komamiya, R.V. Kowalewski, T. Kress, P. Krieger, J. von Krogh, T. Kuhl, M. Kupper, P. Kyberd, G.D. Lafferty, H. Landsman, D. Lanske, I. Lawson, J.G. Layter, A. Leins, D. Lellouch, J. Letts, L. Levinson, R. Liebisch, J. Lillich, B. List, C. Littlewood, A.W. Lloyd, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Lu, J. Ludwig, A. Macchiolo, A. Macpherson, W. Mader, M. Mannelli, S. Marcellini, T.E. Marchant, A.J. Martin, J.P. Martin, G. Martinez, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, T.J. McMahon, R.A. McPherson, F. Meijers, P. Mendez-Lorenzo, F.S. Merritt, H. Mes, I. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D.J. Miller, W. Mohr, A. Montanari, T. Mori, K. Nagai, I. Nakamura, H.A. Neal, R. Nisius, S.W. O'Neale, F.G. Oakham, F. Odorici, H.O. Ogren, A. Okpara, M.J. Oreglia, S. Orito, G. Pásztor, J.R. Pater, G.N. Patrick, J. Patt, R. Perez-Ochoa, P. Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, B. Poli, J. Polok, M. Przybycień, A. Quadt, C. Rembser, H. Rick, S.A. Robins, N. Rodning, J.M. Roney, S. Rosati, K. Roscoe, A.M. Rossi, Y. Rozen, K. Runge, O. Runolfsson, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, W.M. Sang, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, P. Scharff-Hansen, S. Schmitt, A. Schöning, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, M. Sproston, A. Stahl, K. Stephens, K. Stoll, D. Strom, R. Ströhmer, B. Surrow, S.D. Talbot, S. Tarem, R.J. Taylor, R. Teuscher, M. Thiergen, J. Thomas, M.A. Thomson, E. Torrence, S. Towers, T. Trefzger, I. Trigger, Z. Trócsányi, E. Tsur, M.F. Turner-Watson, I. Ueda, R. Van Kooten, P. Vannerem, M. Verzocchi, H. Voss, D. Waller, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, T. Wengler, N. Wermes, D. Wetterling, J.S. White, G.W. Wilson, J.A. Wilson, T.R. Wyatt, S. Yamashita, V. Zacek, and D. Zer-Zion

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, Form factor (quantum field theory), Zero (complex analysis), Value (computer science), 01 natural sciences, Recoil, 0103 physical sciences, Heavy quark effective theory, Matrix element, 010306 general physics
Abstract

The magnitude of the Cabibbo-Kobayashi-Maskawa matrix element Vcb has been measured using B0 to D*l nu decays recorded on the Z0 peak using the OPAL detector at LEP. The D* to D0 pi+ decays were reconstructed both in the particular decay modes D0 to K- pi+ and D0 to K- pi+ pi- and via an inclusive technique. The product of |Vcb| and the decay form factor of the B0 to D* l nu transition at zero recoil F(1) was measured to be F(1)|Vcb| = (37.1+-1.0+-2.0)x10^-3, where the uncertainties are statistical and systematic respectively. By using Heavy Quark Effective Theory calculations for F(1), a value of |Vcb| = (40.7+-1.1+-2.2+-1.6)x 10^-3 was obtained, where the third error is due to theoretical uncertainties in the value of F(1). The branching ratio Br(B0 to D* l nu) was also measured to be (5.26+-0.20+-0.46)%.

Published
2000
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39. Z boson pair production in e+e− collisions at and 189 GeV

Author

G. Abbiendi, K. Ackerstaff, P.F. Akesson, G. Alexander, J. Allison, K.J. Anderson, S. Arcelli, S. Asai, S.F. Ashby, D. Axen, G. Azuelos, I. Bailey, A.H. Ball, E. Barberio, R.J. Barlow, J.R. Batley, S. Baumann, T. Behnke, K.W. Bell, G. Bella, A. Bellerive, S. Bentvelsen, S. Bethke, O. Biebel, A. Biguzzi, I.J. Bloodworth, P. Bock, J. Böhme, O. Boeriu, D. Bonacorsi, M. Boutemeur, S. Braibant, P. Bright-Thomas, L. Brigliadori, R.M. Brown, H.J. Burckhart, J. Cammin, P. Capiluppi, R.K. Carnegie, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, D. Chrisman, C. Ciocca, P.E.L. Clarke, E. Clay, I. Cohen, O.C. Cooke, J. Couchman, C. Couyoumtzelis, R.L. Coxe, M. Cuffiani, S. Dado, G.M. Dallavalle, S. Dallison, R. Davis, A. de Roeck, P. Dervan, K. Desch, B. Dienes, M.S. Dixit, M. Donkers, J. Dubbert, E. Duchovni, G. Duckeck, I.P. Duerdoth, P.G. Estabrooks, E. Etzion, F. Fabbri, A. Fanfani, M. Fanti, A.A. Faust, L. Feld, P. Ferrari, F. Fiedler, M. Fierro, I. Fleck, A. Frey, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, D.M. Gingrich, D. Glenzinski, J. Goldberg, W. Gorn, C. Grandi, K. Graham, E. Gross, J. Grunhaus, M. Gruwé, P.O. Günther, C. Hajdu, G.G. Hanson, M. Hansroul, M. Hapke, K. Harder, A. Harel, C.K. Hargrove, M. Harin-Dirac, A. Hauke, M. Hauschild, C.M. Hawkes, R. Hawkings, R.J. Hemingway, C. Hensel, G. Herten, R.D. Heuer, M.D. Hildreth, J.C. Hill, P.R. Hobson, A. Hocker, K. Hoffman, R.J. Homer, A.K. Honma, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, D.C. Imrie, K. Ishii, F.R. Jacob, A. Jawahery, H. Jeremie, M. Jimack, C.R. Jones, P. Jovanovic, T.R. Junk, N. Kanaya, J. Kanzaki, G. Karapetian, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, P.I. Kayal, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, D.H. Kim, K. Klein, A. Klier, T. Kobayashi, M. Kobel, T.P. Kokott, M. Kolrep, S. Komamiya, R.V. Kowalewski, T. Kress, P. Krieger, J. von Krogh, T. Kuhl, M. Kupper, P. Kyberd, G.D. Lafferty, H. Landsman, D. Lanske, I. Lawson, J.G. Layter, A. Leins, D. Lellouch, J. Letts, L. Levinson, R. Liebisch, J. Lillich, B. List, C. Littlewood, A.W. Lloyd, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Lu, J. Ludwig, A. Macchiolo, A. Macpherson, W. Mader, M. Mannelli, S. Marcellini, T.E. Marchant, A.J. Martin, J.P. Martin, G. Martinez, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, T.J. McMahon, R.A. McPherson, F. Meijers, P. Mendez-Lorenzo, F.S. Merritt, H. Mes, I. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D.J. Miller, W. Mohr, A. Montanari, T. Mori, K. Nagai, I. Nakamura, H.A. Neal, R. Nisius, S.W. O'Neale, F.G. Oakham, F. Odorici, H.O. Ogren, A. Okpara, M.J. Oreglia, S. Orito, G. Pásztor, J.R. Pater, G.N. Patrick, J. Patt, R. Perez-Ochoa, P. Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, B. Poli, J. Polok, M. Przybycień, A. Quadt, C. Rembser, H. Rick, S.A. Robins, N. Rodning, J.M. Roney, S. Rosati, K. Roscoe, A.M. Rossi, Y. Rozen, K. Runge, O. Runolfsson, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, W.M. Sang, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, P. Scharff-Hansen, S. Schmitt, A. Schöning, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, M. Sproston, A. Stahl, K. Stephens, K. Stoll, D. Strom, R. Ströhmer, B. Surrow, S.D. Talbot, S. Tarem, R.J. Taylor, R. Teuscher, M. Thiergen, J. Thomas, M.A. Thomson, E. Torrence, S. Towers, T. Trefzger, I. Trigger, Z. Trócsányi, E. Tsur, M.F. Turner-Watson, I. Ueda, R. Van Kooten, P. Vannerem, M. Verzocchi, H. Voss, D. Waller, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, T. Wengler, N. Wermes, D. Wetterling, J.S. White, G.W. Wilson, J.A. Wilson, T.R. Wyatt, S. Yamashita, V. Zacek, and D. Zer-Zion

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, 010308 nuclear & particles physics, State (functional analysis), 01 natural sciences, Standard Model, Pair production, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010303 astronomy & astrophysics, Lepton
Abstract

A study of Z boson pair production in e+e- annihilation at center-of-mass energies near 183 GeV and 189 GeV is reported. Final states containing only leptons, (l+l-l+l- and l+l-nu nubar), quark and lepton pairs, (q qbar l+l-, q qbar nu nubar) and the all-hadronic final state (q qbar q qbar) are considered. In all states with at least one Z boson decaying hadronically, q qbar and b bbar final states are considered separately using lifetime and event-shape tags, thereby improving the cross-section measurement. At sqrt(s) = 189 GeV the Z-pair cross section was measured to be 0.80 (+0.14-0.13, stat.) (+0.06-0.05, syst.) pb, consistent with the Standard Model prediction. At sqrt(s) = 183 GeV the 95% C.L. upper limit is 0.55 pb. Limits on anomalous ZZgamma and ZZZ couplings are derived.

Published
2000
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40. Development and interpretation of nectary organs in Ranunculaceae11Dedicated to Prof. Dr. Werner Rauh on the occasion of his 85th birthday (May 16, 1998)

Author

Peter Leins, Stephanie Kusma, and Claudia Erbar

Subjects
Ecology, biology, Helleborus, Aquilegia, Stamen, Ranunculaceae, Plant Science, Anatomy, biology.organism_classification, Ranunculus, Botany, Primordium, Aquilegia vulgaris, Perianth, Ecology, Evolution, Behavior and Systematics
Abstract

Summary The nectary organs in the flowers of many Ranunculaceae - intercalated between perianth and androecium - are commonly considered as derived from stamens. The homology of both structures is seen in the peltation, i. e. in the formation of a cross zone at the ventral side of the organs. Since detailed investigations have shown that stamens do not develop as peltate leaves (Leins & Boecker 1982), this proof becomes invalid. The very differently shaped nectary organs of Helleborusfoetidus, Ranunculusficaria, Aquilegia vulgaris, and Aconitum napellus can be reduced to a common early stage of development which is characterized by the formation of two basal-lateral bulges at the ventral side of the primordium (Fig. 57). In Helleborus and Ranunculus these bulges become connected with each other to a transverse protuberance. In Helleborus intensive growth of the transverse protuberance being laterally connected with the elongating dorsal part of the primordium results in a tubular nectary organ with the nectary at the base of the tube. In Ranunculus the transverse protuberance develops more or less free from the margins into a scale protecting the nectary. In Aquilegia and Aconitum a connection of the basal-lateral bulges does not take place; the nectary is translocated into a spur turning dorsally above the lateral protuberances. The onto genetical studies show that nectary organs in the Ranunculaceae are not peltate structures in the usual sense because they do not result from a continuous expansion of the margins of the primordium and subsequent fusion at the ventral side like in peltate leaves. Only in Helleborus there is sometimes and especially in older stages a continuum between margins and the ventral protuberance(s). We think, however, that we now have a new piece of evidence for a relation of the ranunculaceous nectary organs with stamens: the initially more or less free basal-lateral bulges (which become connected in Helleborus and Ranunculus) can be interpreted as rudimentary (sterile) adaxial pollen sacs (Fig. 58). The relation between the nectary organs and stamens in Ranunculaceae may be seen as a result of an overlap of the genetic programs of the perianth members and the stamens.

Published
1999
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41. Portioned pollen release and the syndromes of secondary pollen presentation in the Campanulales-Asterales-complex11)Dedicated in friendship to Prof. Dr. Andreas Sievers on the occasion of his 65th birthday (June 21, 1996))

Author

Peter Leins and Claudia Erbar

Subjects
Calyceraceae, Ecology, biology, Pollination, Stamen, Goodeniaceae, Plant Science, biology.organism_classification, medicine.disease_cause, Stylidiaceae, Asterales, Pollinator, Pollen, Botany, medicine, Ecology, Evolution, Behavior and Systematics
Abstract

Summary The release of pollen in portions, i. e. limiting the pollen removed by individual pollinators during a single visit, is a widespread phenomenon. The biological significance of this phenomenon is that it helps to optimize the pollination. Parameters like number of ovules, number of application sites to the pollinator or spectrum of pollinators, which may be correlated with the size of the pollen portion, are illustrated as a net of possible correlations (Fig. 1). Apart from pollenkitt, viscin or cellulosic threads and the non-simultaneous opening of the anthers, the secondary pollen presentation is a special mechanism of pollen portioning. Secondary pollen presentation occurs in several dicotyledonous and in a few monocotyledonous families. Its occurrence is a distinctive feature in the Campanulales-Asterales -complex. The different mechanisms in the Campanulales-Asterales ( Asteraceae, Lobeliaceae, Campanulaceae, Goodeniaceae, Brunoniaceae, Calyceraceae ) are briefly described. The differentiations of the "basic syndrome" (radial symmetry of the flower bud, complete androecial whorl, introrse anthers, the latter connivent at the time of dehiscence, proterandry, late and sequential growth of filaments and style) are presented in two diagrams (Figs. 30 + 31). In addition, a few remarks are given on pollen presentation in Rubiaceae, Cyphiaceae, Sphenocieaceae, Pentaphragmataceae, Stylidiaceae , of which the latter four are usually assigned to Campanulales-Asterales .

Published
1995
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42. Isomers of Re(CO)3(CNtBu)LX: Synthetic strategies starting from MnRe(CO)8(CNtBu)L and Re(CO)4LX (X  halogen; L Group 15 donor ligand)

Author

Neil J. Coville and Ann E. Leins

Subjects
Ligand, Stereochemistry, Dimer, Isocyanide, Organic Chemistry, chemistry.chemical_element, Nuclear magnetic resonance spectroscopy, Rhenium, Biochemistry, Inorganic Chemistry, chemistry.chemical_compound, chemistry, Yield (chemistry), Materials Chemistry, Physical and Theoretical Chemistry, Isomerization, Bond cleavage
Abstract

Reaction of Re(CO)4LX (L  PMePh2, PMe2Ph, PPh3, P(OMe)3, P(OiPr)3, P(O-o-tol)3; X  Br, I) with tBuNC in the presence of PdO catalyst gave the new complexes Re(CO)3(CNtBu)LX in high yield (> 60%). The new complexes were shown by spectroscopic techniques (IR, 1H and 31P NMR) to comprise a mixture of mer and fac isomers. The mer/fac ratio decreased with reaction temperatures (e.g. L  P(OMe)3; 10°C, ratio = 3; 45°C, ratio = 0.25). At high temperatures (90°C) isomerization of the mer to the fac isomers (L  PMe2Ph, P(OMe)3) occurred, suggesting that the mer isomer was the kinetic product of the catalysed reaction. Reactions induced by Me3NO gave similar effects. Halogen cleavage of MnRe (CO)8(CNtBu)L, prepared from MnRe(CO)9(CNtBu) and L in the presence of Me3NO, yielded either one or two isomers of Re(CO)3(CNtBu)(L)X (X  I, Br; 40% yield). For large L (e.g. PPh3) a new mer isomer with L trans to X was synthesized, and characterized by IR and NMR spectroscopy. For small L (e.g. P(OMe)3) a mixture of the two different mer products was obtained. The product isomer ratio was determined predominantly by the position of L in the starting dimer.

Published
1994
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46. The PdO catalysed reaction between Re(CO)5X (X  Cl, Br, I) and L (L  Group 15 donor ligand). Synthesis of Re(CO)4LX

Author

Ann E. Leins and Neil J. Coville

Subjects
Ligand, Chemistry, Stereochemistry, Organic Chemistry, Nuclear magnetic resonance spectroscopy, Biochemistry, Medicinal chemistry, High yielding, Catalysis, Inorganic Chemistry, Yield (chemistry), Materials Chemistry, Proton NMR, Ligand cone angle, Physical and Theoretical Chemistry, Spectroscopy
Abstract

Previously there has been no high yielding synthesis of Re(CO) 4 LX (L  Group 15 donor ligand, X  Cl, Br,I). We here show that the PdO-catalysed reaction between Re(CO) 5 X and L gives Re(CO) 4 LX in > 75% yield when L has a cone angle less than 150°. The new complexes have been fully characterised by IR and 1 H NMR spectroscopy.

Published
1991
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50. Invited commentary

Author

A. Leins and M.D.J. Cremer

Subjects
Pulmonary and Respiratory Medicine, Surgery, Cardiology and Cardiovascular Medicine
Published
2002
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