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1. Comparing proton momentum distributions in A = 2 and 3 nuclei via 2H 3H and 3He (e,e′p) measurements

Author: R. Cruz-Torres, S. Li, F. Hauenstein, A. Schmidt, D. Nguyen, D. Abrams, H. Albataineh, S. Alsalmi, D. Androic, K. Aniol, W. Armstrong, J. Arrington, H. Atac, T. Averett, C. Ayerbe Gayoso, X. Bai, J. Bane, S. Barcus, A. Beck, V. Bellini, H. Bhatt, D. Bhetuwal, D. Biswas, D. Blyth, W. Boeglin, D. Bulumulla, A. Camsonne, J. Castellanos, J.-P. Chen, E.O. Cohen, S. Covrig, K. Craycraft, B. Dongwi, M. Duer, B. Duran, D. Dutta, E. Fuchey, C. Gal, T.N. Gautam, S. Gilad, K. Gnanvo, T. Gogami, J. Gomez, C. Gu, A. Habarakada, T. Hague, O. Hansen, M. Hattawy, O. Hen, D.W. Higinbotham, E. Hughes, C. Hyde, H. Ibrahim, S. Jian, S. Joosten, A. Karki, B. Karki, A.T. Katramatou, C. Keppel, M. Khachatryan, V. Khachatryan, A. Khanal, D. King, P. King, I. Korover, T. Kutz, N. Lashley-Colthirst, G. Laskaris, W. Li, H. Liu, N. Liyanage, D. Lonardoni, R. Machleidt, L.E. Marcucci, P. Markowitz, R.E. McClellan, D. Meekins, S. Mey-Tal Beck, Z.-E. Meziani, R. Michaels, M. Mihovilovič, V. Nelyubin, N. Nuruzzaman, M. Nycz, R. Obrecht, M. Olson, L. Ou, V. Owen, B. Pandey, V. Pandey, A. Papadopoulou, S. Park, M. Patsyuk, S. Paul, G.G. Petratos, E. Piasetzky, R. Pomatsalyuk, S. Premathilake, A.J.R. Puckett, V. Punjabi, R. Ransome, M.N.H. Rashad, P.E. Reimer, S. Riordan, J. Roche, F. Sammarruca, N. Santiesteban, B. Sawatzky, E.P. Segarra, B. Schmookler, A. Shahinyan, S. Širca, N. Sparveris, T. Su, R. Suleiman, H. Szumila-Vance, A.S. Tadepalli, L. Tang, W. Tireman, F. Tortorici, G. Urciuoli, M. Viviani, L.B. Weinstein, B. Wojtsekhowski, S. Wood, Z.H. Ye, Z.Y. Ye, and J. Zhang
Subjects: Physics, QC1-999
Abstract: We report the first measurement of the (e,e′p) reaction cross-section ratios for Helium-3 (He3), Tritium (H3), and Deuterium (d). The measurement covered a missing momentum range of 40≤pmiss≤550MeV/c, at large momentum transfer (〈Q2〉≈1.9 (GeV/c)2) and xB>1, which minimized contributions from non quasi-elastic (QE) reaction mechanisms. The data is compared with plane-wave impulse approximation (PWIA) calculations using realistic spectral functions and momentum distributions. The measured and PWIA-calculated cross-section ratios for He3/d and H3/d extend to just above the typical nucleon Fermi-momentum (kF≈250 MeV/c) and differ from each other by ∼20%, while for He3/H3 they agree within the measurement accuracy of about 3%. At momenta above kF, the measured He3/H3 ratios differ from the calculation by 20%−50%. Final state interaction (FSI) calculations using the generalized Eikonal Approximation indicate that FSI should change the He3/H3 cross-section ratio for this measurement by less than 5%. If these calculations are correct, then the differences at large missing momenta between the He3/H3 experimental and calculated ratios could be due to the underlying NN interaction, and thus could provide new constraints on the previously loosely-constrained short-distance parts of the NN interaction.
Published: 2019
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2. The Development of a Multivalent Capripoxvirus-Vectored Vaccine Candidate to Protect against Sheeppox, Goatpox, Peste des Petits Ruminants, and Rift Valley Fever

Author: Hani Boshra, Graham A. D. Blyth, Thang Truong, Andrea Kroeker, Pravesh Kara, Arshad Mather, David Wallace, and Shawn Babiuk
Subjects: sheeppox, goatpox, lumpy skin disease, peste des petits ruminants, Rift Valley fever, vector, Medicine
Abstract: Capripoxviruses are the causative agents of sheeppox, goatpox, and lumpy skin disease (LSD) in cattle, which cause economic losses to the livestock industry in Africa and Asia. Capripoxviruses are currently controlled using several live attenuated vaccines. It was previously demonstrated that a lumpy skin disease virus (LSDV) field isolate from Warmbaths (WB) South Africa, ORF 005 (IL-10) gene-deleted virus (LSDV WB005KO), was able to protect sheep and goats against sheeppox and goatpox. Subsequently, genes encoding the protective antigens for peste des petits ruminants (PPR) and Rift Valley fever (RVF) viruses have been inserted in the LSDV WB005KO construct in three different antigen forms (native, secreted, and fusion). These three multivalent vaccine candidates were evaluated for protection against PPR using a single immunization of 104 TCID50 in sheep. The vaccine candidates with the native and secreted antigens protected sheep against PPR clinical disease and decreased viral shedding, as detected using real-time RT-PCR in oral and nasal swabs. An anamnestic antibody response, measured using PPR virus-neutralizing antibody response production, was observed in sheep following infection. The vaccine candidates with the antigens expressed in their native form were evaluated for protection against RVF using a single immunization with doses of 104 or 105 TCID50 in sheep and goats. Following RVF virus infection, sheep and goats were protected against clinical disease and no viremia was detected in serum compared to control animals, where viremia was detected one day following infection. Sheep and goats developed RVFV-neutralizing antibodies prior to infection, and the antibody responses increased following infection. These results demonstrate that an LSD virus-vectored vaccine candidate can be used in sheep and goats to protect against multiple viral infections.
Published: 2024
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3. Heat-Stable Enterotoxin Secretions Assessed via ICP-MS Reveal Iron-Mediated Regulation of Virulence in CFA/I- and CS6-Expressing ETEC Isolates

Author: Ian E. Hollifield, Natalya I. Motyka, Sydney R. Stewart, Michelle D. Blyth, Kaylynn A. Fernando, Kristen L. Clement, and Jacob P. Bitoun
Subjects: enterotoxins, diarrhea, ETEC, secretion, metals, adhesin, Cytology, QH573-671
Abstract: Enterotoxigenic Escherichia coli (ETEC) are a significant cause of childhood diarrhea in low-resource settings. ETEC are defined by the production of heat-stable enterotoxin (ST) and/or heat-labile enterotoxin (LT), which alter intracellular cyclic nucleotide signaling and cause the secretion of water and electrolytes into the intestinal lumen. ETEC take cues from chemicals (e.g., glycans, bile salts, and solutes) that may be liberated following enterotoxin activity to recognize entrance into the host. ETEC then alter the expression of surface adhesins called colonization factors (CFs) to attach to the intestinal epithelium, proliferate, and cause disease. Here, we used an in vivo model of oral ST intoxication to determine its impact on luminal ion concentrations via ICP-MS. We also used functional assays, including Western blots, qPCR, and toxin activity assays, to assess the impact of luminal ion flux on CF and toxin expression. Finally, we assessed ETEC strains with CFs CFA/I or CS6 in a streptomycin mouse model of ETEC colonization. ST causes rapid and significant increases in luminal chloride but significant decreases in luminal magnesium and iron. We confirmed that increased sodium chloride suppresses CFA/I production in ETEC H10407 but does not affect CS6 production in ETEC 214-4. CFA/I production in ETEC H10407 is increased when magnesium becomes limiting, although it does not affect CS6 production in ETEC 214-4. Iron restriction via deferoxamine induces CFA/I expression in ETEC H10407 but not CS6 expression in ETEC 214-4. We demonstrate that ST production is suppressed via iron restriction in H10407, 214-4, and over 50 other ETEC clinical isolates. Lastly, we demonstrate that the iron restriction of mice using oral deferoxamine pre-treatment extends the duration of ETEC H10407 (CFA/I+) fecal shedding while accelerating ETEC 214-4 (CS6+) fecal shedding. Combined, these data suggest that enterotoxins modulate luminal ion flux to influence ETEC virulence including toxin and CF production.
Published: 2023
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4. Interleukin-4 Programmed Macrophages Suppress Colitis and Do Not Enhance Infectious-Colitis, Inflammation-Associated Colon Cancer or Airway Hypersensitivity

Author: Blanca E. Callejas, Graham A. D. Blyth, Nicholas Jendzjowsky, Arthur Wang, Anshu Babbar, Konstantin Koro, Richard J. A. Wilson, Margaret M. Kelly, Eduardo R. Cobo, and Derek M. McKay
Subjects: intestinal inflammation, macrophage-based therapy, colitis-associated colorectal cancer, Citrobacter rodentium, airway inflammation, Immunologic diseases. Allergy, RC581-607
Abstract: The murine interleukin-4 treated macrophage (MIL4) exerts anti-inflammatory and pro-healing effects and has been shown to reduce the severity of chemical-induced colitis. Positing M(IL4) transfer as an anti-inflammatory therapy, the possibility of side-effects must be considered. Consequently, bone marrow-derived M(IL4)s were administered via intraperitoneal injection to mice concomitant with Citrobacter rodentium infection (infections colitis), azoxymethane/dextran sodium sulphate (AOM/DSS) treatment [a model of colorectal cancer (CRC)], or ovalbumin sensitization (airway inflammation). The impact of M(IL4) treatment on C. rodentium infectivity, colon histopathology, tumor number and size and tissue-specific inflammation was examined in these models. The anti-colitic effect of the M(IL4)s were confirmed in the di-nitrobenzene sulphonic acid model of colitis and the lumen-to-blood movement of 4kDa FITC-dextran and bacterial translocation to the spleen and liver was also improved by M(IL4) treatment. Analysis of the other models of disease, that represent comorbidities that can occur in human inflammatory bowel disease (IBD), revealed that M(IL4) treatment did not exaggerate the severity of any of the conditions. Rather, there was reduction in the size (but not number) of polyps in the colon of AOM/DSS-mice and reduced infectivity and inflammation in C. rodentium-infected mice in M(IL4)-treated mice. Thus, while any new therapy can have unforeseen side effects, our data confirm and extend the anti-colitic capacity of murine M(IL4)s and indicate that systemic delivery of one million M(IL4)s did not exaggerate disease in models of colonic or airways inflammation or colonic tumorigenesis.
Published: 2021
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5. The Network of Colonic Host Defense Peptides as an Innate Immune Defense Against Enteropathogenic Bacteria

Author: Graham A. D. Blyth, Liam Connors, Cristina Fodor, and Eduardo R. Cobo
Subjects: colonic epithelium, host defense peptides, cathelicidin, defensin, colitis, Immunologic diseases. Allergy, RC581-607
Abstract: Host defense peptides, abundantly secreted by colonic epithelial cells and leukocytes, are proposed to be critical components of an innate immune response in the colon against enteropathogenic bacteria, including Shigella spp., Salmonella spp., Clostridium difficile, and attaching and effacing Escherichia coli and Citrobacter rodentium. These short cationic peptides are bactericidal against both Gram-positive and -negative enteric pathogens, but may also exert killing effects on intestinal luminal microbiota. Simultaneously, these peptides modulate numerous cellular responses crucial for gut defenses, including leukocyte chemotaxis and migration, wound healing, cytokine production, cell proliferation, and pathogen sensing. This review discusses recent advances in our understanding of expression, mechanisms of action and microbicidal and immunomodulatory functions of major colonic host defense peptides, namely cathelicidins, β-defensins, and members of the Regenerating islet-derived protein III (RegIII) and Resistin-like molecule (RELM) families. In a theoretical framework where these peptides work synergistically, aspects of pathogenesis of infectious colitis reviewed herein uncover roles of host defense peptides aimed to promote epithelial defenses and prevent pathogen colonization, mediated through a combination of direct antimicrobial function and fine-tuning of host immune response and inflammation. This interactive host defense peptide network may decode how the intestinal immune system functions to quickly clear infections, restore homeostasis and avoid damaging inflammation associated with pathogen persistence during infectious colitis. This information is of interest in development of host defense peptides (either alone or in combination with reduced doses of antibiotics) as antimicrobial and immunomodulatory therapeutics for controlling infectious colitis.
Published: 2020
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6. On some questions related to integrable groups

Author: Russell D. Blyth, Francesco Fumagalli, Francesco Matucci, Blyth, R, Fumagalli, F, and Matucci, F
Subjects: Mathematics::Group Theory, 2-homogeneous group, Applied Mathematics, 20D99, 20F14, 20D06, 20E28, 20G40, 20G41, FOS: Mathematics, Group Theory (math.GR), MAT/02 - ALGEBRA, Mathematics - Group Theory, Integrable group, Almost-simple group
Abstract: A group $G$ is integrable if it is isomorphic to the derived subgroup of a group $H$; that is, if $H'\simeq G$, and in this case $H$ is an integral of $G$. If $G$ is a subgroup of $U$, we say that $G$ is integrable within $U$ if $G=H'$ for some $H\leq U$. In this work we focus on two problems posed in [1]. We classify the almost-simple finite groups $G$ that are integrable, which we show to be equivalent to those integrable within $\mathrm{Aut}(S)$, where $S$ is the socle of $G$. We then classify all $2$-homogeneous subgroups of the finite symmetric group $S_n$ that are integrable within $S_n$., Comment: 12 pages, no figures
Published: 2022
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7. Interleukin-4 Programmed Macrophages Suppress Colitis and Do Not Enhance Infectious-Colitis, Inflammation-Associated Colon Cancer or Airway Hypersensitivity

Author: Konstantin Koro, Arthur Wang, Margaret M. Kelly, Blanca E. Callejas, Derek M. McKay, Richard J. A. Wilson, Eduardo R. Cobo, Nicholas G. Jendzjowsky, Graham A D Blyth, and Anshu Babbar
Subjects: Male, Colorectal cancer, Immunology, Inflammation, airway inflammation, Infectious Colitis, Inflammatory bowel disease, chemistry.chemical_compound, Mice, immune system diseases, intestinal inflammation, medicine, Citrobacter rodentium, Respiratory Hypersensitivity, Immunology and Allergy, Animals, colitis-associated colorectal cancer, Colitis, skin and connective tissue diseases, Interleukin 4, Original Research, Mice, Inbred BALB C, business.industry, Azoxymethane, Macrophages, RC581-607, medicine.disease, Mice, Inbred C57BL, macrophage-based therapy, chemistry, Colonic Neoplasms, Interleukin-4, medicine.symptom, Immunologic diseases. Allergy, business
Abstract: The murine interleukin-4 treated macrophage (MIL4) exerts anti-inflammatory and pro-healing effects and has been shown to reduce the severity of chemical-induced colitis. Positing M(IL4) transfer as an anti-inflammatory therapy, the possibility of side-effects must be considered. Consequently, bone marrow-derived M(IL4)s were administered via intraperitoneal injection to mice concomitant with Citrobacter rodentium infection (infections colitis), azoxymethane/dextran sodium sulphate (AOM/DSS) treatment [a model of colorectal cancer (CRC)], or ovalbumin sensitization (airway inflammation). The impact of M(IL4) treatment on C. rodentium infectivity, colon histopathology, tumor number and size and tissue-specific inflammation was examined in these models. The anti-colitic effect of the M(IL4)s were confirmed in the di-nitrobenzene sulphonic acid model of colitis and the lumen-to-blood movement of 4kDa FITC-dextran and bacterial translocation to the spleen and liver was also improved by M(IL4) treatment. Analysis of the other models of disease, that represent comorbidities that can occur in human inflammatory bowel disease (IBD), revealed that M(IL4) treatment did not exaggerate the severity of any of the conditions. Rather, there was reduction in the size (but not number) of polyps in the colon of AOM/DSS-mice and reduced infectivity and inflammation in C. rodentium-infected mice in M(IL4)-treated mice. Thus, while any new therapy can have unforeseen side effects, our data confirm and extend the anti-colitic capacity of murine M(IL4)s and indicate that systemic delivery of one million M(IL4)s did not exaggerate disease in models of colonic or airways inflammation or colonic tumorigenesis.
Published: 2021
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8. Cathelicidin-mediated lipopolysaccharide signaling via intracellular TLR4 in colonic epithelial cells evokes CXCL8 production

Author: Graham A D Blyth, Anshu Babbar, Humberto Jijon, Ravi Holani, Derek M. McKay, Morley D. Hollenberg, Eduardo R. Cobo, and Fernando Lopes
Subjects: 0301 basic medicine, Lipopolysaccharides, Lipopolysaccharide, Neutrophils, medicine.medical_treatment, Chemokine CXCL1, Cathelicidin, chemistry.chemical_compound, Mice, 0302 clinical medicine, cathelicidin, Intestinal Mucosa, Gastroenterology, Colitis, Cell biology, CXCL1, Infectious Diseases, CXCL8, 030211 gastroenterology & hepatology, lipids (amino acids, peptides, and proteins), Signal transduction, Intracellular, Research Article, Research Paper, Signal Transduction, Microbiology (medical), Colon, G(M1) Ganglioside, Biology, Microbiology, 03 medical and health sciences, Membrane Microdomains, Cathelicidins, medicine, Animals, Humans, Secretion, Interleukin 8, lcsh:RC799-869, Bacteria, Interleukin-8, NF-kappa B p50 Subunit, Epithelial Cells, Toll-Like Receptor 4, 030104 developmental biology, chemistry, salmonella spp, TLR4, lcsh:Diseases of the digestive system. Gastroenterology, Colonic epithelium, Antimicrobial Cationic Peptides
Abstract: We hypothesized that the antimicrobial peptide cathelicidin has a physiological role in regulating gut inflammatory homeostasis. We determined that cathelicidin synergizes with LPS to facilitate its internalization and signaling via endosomic TLR4 in colonic epithelium, evoking synthesis of the human neutrophil chemoattractant, CXCL8 (or murine homolog, CXCL1). Interaction of cathelicidin with LPS in the control of CXCL8/CXCL1 synthesis was assessed in human colon epithelial cells, murine colonoids and cathelicidin-null mice (Camp−/-). Mechanistically, human cathelicidin (LL-37), as an extracellular complex with LPS, interacted with lipid raft-associated GM1 gangliosides to internalize and activate intracellular TLR4. Two signaling pathways converged on CXCL8/CXCL1 production: (1) a p38MAPK-dependent pathway regulated by Src-EGFR kinases; and, (2) a p38MAPK-independent, NF-κB-dependent pathway, regulated by MEK1/2-MAPK. Increased cathelicidin-dependent CXCL8 secretion in the colonic mucosa activated human blood-derived neutrophils. These cathelicidin effects occurred in vitro at concentrations well below those needed for microbicidal function. The important immunomodulatory role of cathelicidins was evident in cathelicidin-null/Camp−/- mice, which had diminished colonic CXCL1 secretion, decreased neutrophil recruitment-activation and reduced bacterial clearance when challenged with the colitis-inducing murine pathogen, Citrobacter rodentium. We conclude that in addition to its known microbicidal action, cathelicidin has a unique pathogen-sensing role, facilitating LPS-mediated intestinal responses, including the production of CXCL8/CXCL1 that would contribute to an integrated tissue response to recruit neutrophils during colitis.
Published: 2020

9. Probing Few-Body Nuclear Dynamics via H3 and He3 (e,e′p)pn Cross-Section Measurements

Author: M. Mihovilovic, Bogdan Wojtsekhowski, Darko Androić, D. Blyth, R. I. Pomatsalyuk, R. Obrecht, Andrew Puckett, Toshiyuki Gogami, Shalev Gilad, H. F. Ibrahim, B. Karki, Dipangkar Dutta, J. Castellanos, N. Santiesteban, Afroditi Papadopoulou, Pete Markowitz, M. Duer, Misak Sargsian, J. Arrington, M. Khachatryan, K. A. Aniol, S. Alsalmi, Nikolaos Sparveris, W. Tireman, Henryk Witała, Z. E. Meziani, J. P. Chen, Siyu Jian, T. Gautam, A. Karki, P. E. Reimer, H. Bhatt, I. Korover, R. Cruz-Torres, Nilanga Liyanage, C. Ayerbe Gayoso, V. Bellini, M. N. H. Rashad, G. M. Urciuoli, S. Covrig, Elliot Hughes, Z. Ye, S. Mey-Tal Beck, B. Schmookler, L. Ou, Weidong Li, J. Gomez, Simon Širca, B. Pandey, H. Albataineh, S. Barcus, S. Premathilake, E. Piasetzky, Ronald Ransome, D. Nguyen, Or Hen, Vladimir Nelyubin, Shanfeng Li, A. Beck, A. Camsonne, E. Fuchey, A. S. Tadepalli, Jacek Golak, P. M. King, T. Averett, D. G. Meekins, A. T. Katramatou, A. Shahinyan, Alexander Schmidt, N. Nuruzzaman, C. E. Hyde, R. E. McClellan, T. Kutz, Larry Weinstein, F. Hauenstein, Sylvester Joosten, S. A. Wood, G. Laskaris, W. U. Boeglin, D. Bulumulla, D. Biswas, F. Tortorici, Olfred Hansen, J. Roche, G. G. Petratos, L. Tang, Fatiha Benmokhtar, H. Atac, R. Skibiński, Kondo Gnanvo, Aditya R. Khanal, M. Nycz, D. Abrams, Cynthia Keppel, X. Bai, S. Park, H. Szumila-Vance, B. Duran, E.P. Segarra, S. Riordan, V. Khachatryan, V. A. Punjabi, C. Gu, Vishvas Pandey, T. Hague, D. King, M. Hattawy, D. Bhetuwal, Eliahu Cohen, R. Michaels, Hongjun Liu, M. Olson, M. Patsyuk, Kacper Topolnicki, B. Sawatzky, N. Lashley-Colthirst, Jiawen Zhang, Whitney Armstrong, S. Paul, T. Su, B. Dongwi, Hiroyuki Kamada, Douglas Higinbotham, V. Owen, J. Bane, C. Gal, A. Habarakada, Riad Suleiman, and K. Craycraft
Subjects: Physics, Scattering, Isoscalar, Nuclear Theory, Momentum transfer, General Physics and Astronomy, Few-body systems, 01 natural sciences, Nuclear physics, Cover (topology), 0103 physical sciences, Nuclear force, Nuclear Experiment, 010306 general physics, Ground state, Nucleon
Abstract: We report the first measurement of the (e,e^{'}p) three-body breakup reaction cross sections in helium-3 (^{3}He) and tritium (^{3}H) at large momentum transfer [⟨Q^{2}⟩≈1.9 (GeV/c)^{2}] and x_{B}>1 kinematics, where the cross section should be sensitive to quasielastic (QE) scattering from single nucleons. The data cover missing momenta 40≤p_{miss}≤500 MeV/c that, in the QE limit with no rescattering, equals the initial momentum of the probed nucleon. The measured cross sections are compared with state-of-the-art ab initio calculations. Overall good agreement, within ±20%, is observed between data and calculations for the full p_{miss} range for ^{3}H and for 100≤p_{miss}≤350 MeV/c for ^{3}He. Including the effects of rescattering of the outgoing nucleon improves agreement with the data at p_{miss}>250 MeV/c and suggests contributions from charge-exchange (SCX) rescattering. The isoscalar sum of ^{3}He plus ^{3}H, which is largely insensitive to SCX, is described by calculations to within the accuracy of the data over the entire p_{miss} range. This validates current models of the ground state of the three-nucleon system up to very high initial nucleon momenta of 500 MeV/c.
Published: 2020
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10. Dietary starch promotes hepatic lipogenesis in barramundi (

Author: N M, Wade, L H, Trenkner, I, Viegas, L C, Tavares, M, Palma, S, Skiba-Cassy, K, Dias, C, Vachot, B C, Araújo, N, Bourne, D, Blyth, S, Irvin, and B D, Glencross
Subjects: Liver, Lipogenesis, Animals, Animal Nutritional Physiological Phenomena, Bass, Starch, Dietary Proteins, Diet
Abstract: Barramundi (Lates calcarifer) are a highly valued aquaculture species, and, as obligate carnivores, they have a demonstrated preference for dietary protein over lipid or starch to fuel energetic growth demands. In order to investigate how carnivorous fish regulate nutritional cues, we examined the metabolic effects of feeding two isoenergetic diets that contained different proportions of digestible protein or starch energy. Fish fed a high proportion of dietary starch energy had a higher proportion of liver SFA, but showed no change in plasma glucose levels, and few changes in the expression of genes regulating key hepatic metabolic pathways. Decreased activation of the mammalian target of rapamycin growth signalling cascade was consistent with decreased growth performance values. The fractional synthetic rate (lipogenesis), measured by TAG 2H-enrichment using 2H NMR, was significantly higher in barramundi fed with the starch diet compared with the protein diet (0·6 (se 0·1) v. 0·4 (se 0·1) % per d, respectively). Hepatic TAG-bound glycerol synthetic rates were much higher than other closely related fish such as sea bass, but were not significantly different (starch, 2·8 (se 0·3) v. protein, 3·4 (se 0·3) % per d), highlighting the role of glycerol as a metabolic intermediary and high TAG-FA cycling in barramundi. Overall, dietary starch significantly increased hepatic TAG through increased lipogenesis. Compared with other fish, barramundi possess a unique mechanism to metabolise dietary carbohydrates and this knowledge may define ways to improve performance of advanced formulated feeds.
Published: 2020

11. A novel approach to building micromegas detectors enabled by precision manufacturing

Author: Ricardo Alarcon, D. Blyth, E. Galyaev, Kevin Scheuer, Jason Holmes, R. Acuna, Benjamin Fox, and N. Mullins
Subjects: High-gain antenna, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Computer science, Core component, Detector, FOS: Physical sciences, MicroMegas detector, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, Particle detector, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, 0302 clinical medicine, 0103 physical sciences, Electronic engineering, High spatial resolution, Particle flux, Instrumentation, Image resolution, Mathematical Physics
Abstract: Micromegas detectors are a relatively modern design concept for micropattern gas detectors, designed to handle high particle flux while providing high gain, high spatial resolution, and fast response times for a variety of radiation detection applications. Due to the advancement of industry, building a micromegas detector without advanced in-house capabilities is now possible. In this work, we present an innovative method to build micromegas detectors utilizing precision manufacturers to fabricate the core components. Two detectors were built using the newly described method and are experimentally validated., 11 pages, 8 figures
Published: 2020

12. On the holomorph of finite semisimple groups

Author: Russell D. Blyth and Francesco Fumagalli
Subjects: Algebra and Number Theory, Group (mathematics), 010102 general mathematics, Regular representation, Group Theory (math.GR), Holomorphs, Symmetric Groups, Galois Group, 01 natural sciences, Set (abstract data type), Combinatorics, Holomorph, 0103 physical sciences, FOS: Mathematics, 010307 mathematical physics, 0101 mathematics, Mathematics - Group Theory, Mathematics
Abstract: Given a finite nonabelian semisimple group G, we describe those groups that have the same holomorph as G, that is, those regular subgroups N ≃ G {N\simeq G} of S ⁢ ( G ) {S(G)} , the group of permutations on the set G, such that N S ⁢ ( G ) ⁢ ( N ) = N S ⁢ ( G ) ⁢ ( ρ ⁢ ( G ) ) {N_{S(G)}(N)=N_{S(G)}(\rho(G))} , where ρ is the right regular representation of G.
Published: 2020

13. Probing few-body nuclear dynamics via ^{3}H and ^{3}He (e, {e}'p)pn cross-section measurements

Author: R, Cruz-Torres, D, Nguyen, F, Hauenstein, A, Schmidt, S, Li, D, Abrams, H, Albataineh, S, Alsalmi, D, Androic, K, Aniol, W, Armstrong, J, Arrington, H, Atac, T, Averett, C, Ayerbe Gayoso, X, Bai, J, Bane, S, Barcus, A, Beck, V, Bellini, F, Benmokhtar, H, Bhatt, D, Bhetuwal, D, Biswas, D, Blyth, W, Boeglin, D, Bulumulla, A, Camsonne, J, Castellanos, J-P, Chen, E O, Cohen, S, Covrig, K, Craycraft, B, Dongwi, M, Duer, B, Duran, D, Dutta, E, Fuchey, C, Gal, T N, Gautam, S, Gilad, K, Gnanvo, T, Gogami, J, Golak, J, Gomez, C, Gu, A, Habarakada, T, Hague, O, Hansen, M, Hattawy, O, Hen, D W, Higinbotham, E, Hughes, C, Hyde, H, Ibrahim, S, Jian, S, Joosten, H, Kamada, A, Karki, B, Karki, A T, Katramatou, C, Keppel, M, Khachatryan, V, Khachatryan, A, Khanal, D, King, P, King, I, Korover, T, Kutz, N, Lashley-Colthirst, G, Laskaris, W, Li, H, Liu, N, Liyanage, P, Markowitz, R E, McClellan, D, Meekins, S, Mey-Tal Beck, Z-E, Meziani, R, Michaels, M, Mihovilovič, V, Nelyubin, N, Nuruzzaman, M, Nycz, R, Obrecht, M, Olson, L, Ou, V, Owen, B, Pandey, V, Pandey, A, Papadopoulou, S, Park, M, Patsyuk, S, Paul, G G, Petratos, E, Piasetzky, R, Pomatsalyuk, S, Premathilake, A J R, Puckett, V, Punjabi, R, Ransome, M N H, Rashad, P E, Reimer, S, Riordan, J, Roche, M, Sargsian, N, Santiesteban, B, Sawatzky, E P, Segarra, B, Schmookler, A, Shahinyan, S, Širca, R, Skibiński, N, Sparveris, T, Su, R, Suleiman, H, Szumila-Vance, A S, Tadepalli, L, Tang, W, Tireman, K, Topolnicki, F, Tortorici, G, Urciuoli, L B, Weinstein, H, Witała, B, Wojtsekhowski, S, Wood, Z H, Ye, Z Y, Ye, and J, Zhang
Abstract: We report the first measurement of the (e,e^{'}p) three-body breakup reaction cross sections in helium-3 (^{3}He) and tritium (^{3}H) at large momentum transfer [⟨Q^{2}⟩≈1.9 (GeV/c)^{2}] and x_{B}1 kinematics, where the cross section should be sensitive to quasielastic (QE) scattering from single nucleons. The data cover missing momenta 40≤p_{miss}≤500 MeV/c that, in the QE limit with no rescattering, equals the initial momentum of the probed nucleon. The measured cross sections are compared with state-of-the-art ab initio calculations. Overall good agreement, within ±20%, is observed between data and calculations for the full p_{miss} range for ^{3}H and for 100≤p_{miss}≤350 MeV/c for ^{3}He. Including the effects of rescattering of the outgoing nucleon improves agreement with the data at p_{miss}250 MeV/c and suggests contributions from charge-exchange (SCX) rescattering. The isoscalar sum of ^{3}He plus ^{3}H, which is largely insensitive to SCX, is described by calculations to within the accuracy of the data over the entire p_{miss} range. This validates current models of the ground state of the three-nucleon system up to very high initial nucleon momenta of 500 MeV/c.
Published: 2020

14. Nonnegative Gaussian process tomography for generalized segmented planar detectors

Author: Jason Holmes, E. Galyaev, D. Blyth, and N. Mullins
Subjects: Physics - Instrumentation and Detectors, Channel (digital image), Computer science, Physics::Instrumentation and Detectors, Physics::Medical Physics, FOS: Physical sciences, Context (language use), Image processing, Iterative reconstruction, 01 natural sciences, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, symbols.namesake, 0302 clinical medicine, 0103 physical sciences, FOS: Electrical engineering, electronic engineering, information engineering, Pencil-beam scanning, Instrumentation, Gaussian process, Mathematical Physics, 010308 nuclear & particles physics, Image and Video Processing (eess.IV), Detector, Instrumentation and Detectors (physics.ins-det), Electrical Engineering and Systems Science - Image and Video Processing, symbols, Focus (optics), Algorithm
Abstract: The concept of Gaussian process tomography along with nonnegative constraints is applied in the context of high-resolution image reconstruction using segmented planar detectors with few readout channels.Expanding on the concept of 2-D projections onto strip-like readout segmentations, 3-D projections as well as more generalized detector segmentation and readout channel mappings are explored. A focus is placed on reconstructing dose distributions in proton therapy pencil beam scanning, and a fast, approximate approach to applying nonnegative constraints is developed and motivated for use in proton therapy beam imaging.
Published: 2019

15. Comparing proton momentum distributions in A = 2 and 3 nuclei via 2H 3H and 3He (e,e′p) measurements

Author: Z. Ye, B. Schmookler, J. P. Chen, G. M. Urciuoli, Diego Lonardoni, P. M. King, Hongbang Liu, R. Michaels, D. King, M. Olson, Darko Androić, S. Covrig, Toshiyuki Gogami, Pete Markowitz, S. Paul, Weidong Li, M. Viviani, Whitney Armstrong, P. E. Reimer, Larry Weinstein, T. Su, M. Patsyuk, H. Atac, B. Dongwi, Or Hen, N. Santiesteban, B. Sawatzky, T. Kutz, V. Bellini, R. I. Pomatsalyuk, H. Bhatt, I. Korover, S. A. Wood, R. Obrecht, S. Riordan, V. Pandey, E. Fuchey, Shanfeng Li, A. Beck, M. Hattawy, John Arrington, S. Mey-Tal Beck, Andrew Puckett, D. Bulumulla, Bogdan Wojtsekhowski, Aditya R. Khanal, F. Hauenstein, Simon Širca, A. Shahinyan, M. N. H. Rashad, Axel Schmidt, Cynthia Keppel, M. Khachatryan, J. Gomez, N. Lashley-Colthirst, D. Blyth, J. Castellanos, Ruprecht Machleidt, R. Suleiman, H. Albataineh, D. Bhetuwal, V. Khachatryan, Kondo Gnanvo, Eliahu Cohen, F. Tortorici, J. Roche, V. A. Punjabi, N. Nuruzzaman, S. Alsalmi, M. Nycz, H. Szumila-Vance, B. Duran, G. G. Petratos, Z. E. Meziani, C. Gal, Vladimir Nelyubin, G. Laskaris, L. Tang, W. Tireman, M. Mihovilovic, A. Karki, Ronald Ransome, D. G. Meekins, A. T. Katramatou, Olfred Hansen, W. U. Boeglin, Nilanga Liyanage, D. Biswas, C. Ayerbe Gayoso, Jiawen Zhang, S. Premathilake, D. Nguyen, X. Bai, E.P. Segarra, Siyu Jian, Elliot Hughes, R. Cruz-Torres, Douglas Higinbotham, L. Ou, S. Barcus, V. Owen, J. Bane, A. S. Tadepalli, R. E. McClellan, A. Habarakada, Sylvester Joosten, K. Craycraft, H. F. Ibrahim, B. Karki, Dipangkar Dutta, Laura Elisa Marcucci, M. Duer, T. Gautam, B. Pandey, Shalev Gilad, A. Papadopoulou, K. A. Aniol, A. Camsonne, D. Abrams, S. Park, F. Sammarruca, N. Sparveris, E. Piasetzky, C. Gu, T. Hague, T. Averett, and C. E. Hyde
Subjects: production [pi], Nuclear and High Energy Physics, data analysis method, Photon, Nuclear Theory, interference, FOS: Physical sciences, Electron, Impulse (physics), Inelastic scattering, 01 natural sciences, xperimental results | Jefferson Lab | electron p: scattering | parity: violation | inelastic scattering | structure function | interference | photon | Z0 | pi: production | spin: asymmetry | data analysis method, Nuclear Theory (nucl-th), structure function, 0103 physical sciences, Z0, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Momentum transfer, photon, inelastic scattering, scattering [electron p], Eikonal approximation, NATURAL SCIENCES. Physics, lcsh:QC1-999, PRIRODNE ZNANOSTI. Fizika, Deuterium, xperimental results, High Energy Physics::Experiment, violation [parity], Atomic physics, Nucleon, asymmetry [spin], lcsh:Physics, Jefferson Lab
Abstract: We report the first measurement of the $(e,e'p)$ reaction cross-section ratios for Helium-3 ($^3$He), Tritium ($^3$H), and Deuterium ($d$). The measurement covered a missing momentum range of $40 \le p_{miss} \le 550$ MeV$/c$, at large momentum transfer ($\langle Q^2 \rangle \approx 1.9$ (GeV$/c$)$^2$) and $x_B>1$, which minimized contributions from non quasi-elastic (QE) reaction mechanisms. The data is compared with plane-wave impulse approximation (PWIA) calculations using realistic spectral functions and momentum distributions. The measured and PWIA-calculated cross-section ratios for $^3$He$/d$ and $^3$H$/d$ extend to just above the typical nucleon Fermi-momentum ($k_F \approx 250$ MeV$/c$) and differ from each other by $\sim 20\%$, while for $^3$He/$^3$H they agree within the measurement accuracy of about 3\%. At momenta above $k_F$, the measured $^3$He/$^3$H ratios differ from the calculation by $20\% - 50\%$. Final state interaction (FSI) calculations using the generalized Eikonal Approximation indicate that FSI should change the $^3$He/$^3$H cross-section ratio for this measurement by less than 5\%. If these calculations are correct, then the differences at large missing momenta between the $^3$He/$^3$H experimental and calculated ratios could be due to the underlying $NN$ interaction, and thus could provide new constraints on the previously loosely-constrained short-distance parts of the $NN$ interaction., 8 pages, 3 figures (4 panels)
Published: 2019

16. ProIO: An event-based I/O stream format for protobuf messages

Author: Sergei Chekanov, J. Alcaraz, S. Binet, D. Blyth, Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Source lines of code, Java, I/O, Event based, General Physics and Astronomy, FOS: Physical sciences, computer.software_genre, 01 natural sciences, Software implementation, 0103 physical sciences, [INFO]Computer Science [cs], Implementation, computer.programming_language, Event, Protobuf, 010304 chemical physics, 010308 nuclear & particles physics, Programming language, Python (programming language), Computational Physics (physics.comp-ph), Event structure, Hardware and Architecture, Stream, Physics - Computational Physics, computer, Decoding methods
Abstract: ProIO is a new event-oriented streaming data format which utilizes Google’s Protocol Buffers (protobuf) to be flexible and highly language-neutral. The ProIO concept is described here along with its software implementations. The performance of the ProIO concept for a dataset with Monte-Carlo event records used in high-energy physics was benchmarked and compared/contrasted with ROOT I/O. Various combinations of general-purpose compression and variable-length integer encoding available in protobuf were used to investigate the relationship between I/O performance and size-on-disk in a few key scenarios. Program summary Program Title: ProIO Program Files doi: http://dx.doi.org/10.17632/mfxsg2d5x5.1 Licensing provisions: BSD 3-clause Programming language: Python, Go, C++, Java Nature of problem: In high-energy and nuclear physics (HEP and NP), Google’s Protocol Buffers (protobufs) can be a useful tool for the persistence of data. However, protobufs are not well-suited for describing large, rich datasets. Additionally, features such as direct event access, lazy event decoding, general-purpose compression, and self-description are features that are important to HEP and NP, but that are missing from protobuf. Solution method: The solution adopted here is to describe and implement a streaming format for wrapping protobufs in an event structure. This solution requires small (typically less than 1000 lines of code) implementations of the format in the desired programming languages. With this approach, most of the I/O heavy lifting is done by the protobufs, and ProIO adds the necessary physics-oriented features.
Published: 2019
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17. Monte Carlo calculation and verification of the geometrical factors for the NPDGamma experiment

Author: D. Blyth, Matthew Musgrave, Kyle B. Grammer, Nadia Fomin, Zhaowen Tang, Geoffrey Greene, Elise Tang, and J. D. Bowman
Subjects: Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, media_common.quotation_subject, Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, Detector, FOS: Physical sciences, Parity (physics), Instrumentation and Detectors (physics.ins-det), Spin isomers of hydrogen, 01 natural sciences, Asymmetry, Computational physics, Neutron capture, Sine wave, 0103 physical sciences, Neutron, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, Instrumentation, media_common
Abstract: The NPDGamma experiment measures the parity-violating asymmetry in $\gamma$-ray emission in the capture of polarized neutrons on liquid parahydrogen. The sensitivity to the asymmetry for each detector in the array is used as a parameter in the extraction of the physics asymmetry from the measured data. The detector array is approximately cylindrically symmetric around the target and a step-wise sinusoidal function has been used for the sensitivity in the previous iteration of the NPDGamma experiment, but deviations from cylindrical symmetry necessitate the use of a Monte Carlo model to determine corrections to the geometrical factors. For the calculations, source code modifications to MCNPX were done in order to calculate the sensitivity of each cesium iodide detector to the physics asymmetry. We describe the MCNPX model and results from calculations and how the results are validated through measurement of the parity violating asymmetry of $\gamma$-rays from neutron capture on chlorine., Comment: 10 pages, 10 figures
Published: 2019
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18. First Observation of P -odd γ Asymmetry in Polarized Neutron Capture on Hydrogen

Author: J. R. Calarco, C. Hayes, Dinko Pocanic, J. Hall, Charles Fieseler, V. Cianciolo, Xin Tong, S. Baeßler, S. Schröder, A. Ramírez-Morales, S. Santra, R. Whitehead, K. Craycraft, Kyle B. Grammer, E. Askanazi, P. N. Seo, S. Balascuta, Erik B. Iverson, A. Sprow, R. Mahurin, Ivan Novikov, J. Stewart, M. Musgrave, E. Frlež, N. Birge, Nadia Fomin, L. Alonzi, A. Salas-Bacci, I. Garishvili, W. M. Snow, Bernhard Lauss, S. Kucuker, W. S. Wilburn, M. Root, Timothy Chupp, D. Evans, Geoffrey Greene, Yasuhiro Masuda, Ricardo Alarcon, F. Simmons, H. Nann, M. Maldonado-Velázquez, M. L. Kabir, E. M. Scott, Robert Milburn, R. C. Gillis, J. D. Bowman, C. E. Coppola, M. McCrea, E. Tang, E. I. Sharapov, Michael Gericke, J. Fry, Christopher Crawford, S. I. Penttilä, D. Blyth, J. Hamblen, P. E. Mueller, Alexander Barzilov, L. Barrón-Palos, Z. Tang, J. Mei, D. Parsons, and D. J. Turkoglu
Subjects: Coupling constant, Physics, Meson, 010308 nuclear & particles physics, media_common.quotation_subject, General Physics and Astronomy, Spin isomers of hydrogen, Coupling (probability), 01 natural sciences, Asymmetry, Pion, 0103 physical sciences, Effective field theory, Neutron, Atomic physics, 010306 general physics, media_common
Abstract: We report the first observation of the parity-violating gamma-ray asymmetry A_{γ}^{np} in neutron-proton capture using polarized cold neutrons incident on a liquid parahydrogen target at the Spallation Neutron Source at Oak Ridge National Laboratory. A_{γ}^{np} isolates the ΔI=1, ^{3}S_{1}→^{3}P_{1} component of the weak nucleon-nucleon interaction, which is dominated by pion exchange and can be directly related to a single coupling constant in either the DDH meson exchange model or pionless effective field theory. We measured A_{γ}^{np}=[-3.0±1.4(stat)±0.2(syst)]×10^{-8}, which implies a DDH weak πNN coupling of h_{π}^{1}=[2.6±1.2(stat)±0.2(syst)]×10^{-7} and a pionless EFT constant of C^{^{3}S_{1}→^{3}P_{1}}/C_{0}=[-7.4±3.5(stat)±0.5(syst)]×10^{-11} MeV^{-1}. We describe the experiment, data analysis, systematic uncertainties, and implications of the result.
Published: 2018
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19. Measurement of the absolute neutron beam polarization from a supermirror polarizer and the absolute efficiency of a neutron spin rotator for the NPDGamma experiment using a polarized $^{3}$He neutron spin-filter

Author: S. Balascuta, P. R. Huffman, P. E. Mueller, M.M. Musgrave, D. Blyth, W. M. Snow, V. Cianciolo, Nadia Fomin, Geoffrey Greene, J. D. Bowman, Christopher Crawford, C. Hayes, M. McCrea, E. Tang, J. Hamblen, L. Barrón-Palos, K. Craycraft, Zhaowen Tang, Kyle B. Grammer, S. Kucuker, W. S. Wilburn, Chenyang Jiang, Xin Tong, S. Baeßler, R. C. Gillis, Seppo Penttila, Timothy Chupp, Michael Gericke, and J. Fry
Subjects: Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FOS: Physical sciences, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Instrumentation, Physics, 010308 nuclear & particles physics, Instrumentation and Detectors (physics.ins-det), Polarizer, Neutron radiation, 3. Good health, Neutron capture, Beamline, Neutron source, Physics::Accelerator Physics, Spallation Neutron Source, Beam (structure)
Abstract: Accurately measuring the neutron beam polarization of a high flux, large area neutron beam is necessary for many neutron physics experiments. The Fundamental Neutron Physics Beamline (FnPB) at the Spallation Neutron Source (SNS) is a pulsed neutron beam that was polarized with a supermirror polarizer for the NPDGamma experiment. The polarized neutron beam had a flux of $\sim10^9$ neutrons per second per cm$^2$ and a cross sectional area of 10$\times$12~cm$^2$. The polarization of this neutron beam and the efficiency of a RF neutron spin rotator installed downstream on this beam were measured by neutron transmission through a polarized $^{3}$He neutron spin-filter. The pulsed nature of the SNS enabled us to employ an absolute measurement technique for both quantities which does not depend on accurate knowledge of the phase space of the neutron beam or the $^{3}$He polarization in the spin filter and is therefore of interest for any experiments on slow neutron beams from pulsed neutron sources which require knowledge of the absolute value of the neutron polarization. The polarization and spin-reversal efficiency measured in this work were done for the NPDGamma experiment, which measures the parity violating $\gamma$-ray angular distribution asymmetry with respect to the neutron spin direction in the capture of polarized neutrons on protons. The experimental technique, results, systematic effects, and applications to neutron capture targets are discussed., Comment: 13 pages, 14 figures, 2 tables
Published: 2018

20. Duck Interferon-Inducible Transmembrane Protein 3 Mediates Restriction of Influenza Viruses

Author: Katharine E. Magor, Robert G. Webster, Graham A. D. Blyth, and Wing Fuk Chan
Subjects: 0301 basic medicine, Signal peptide, viruses, Molecular Sequence Data, Immunology, Orthomyxoviridae, Cellular Response to Infection, Gene Expression, Biology, Real-Time Polymerase Chain Reaction, medicine.disease_cause, Microbiology, Virus, Cell Line, 03 medical and health sciences, Interferon, Virology, medicine, Animals, Gene, Sequence Homology, Amino Acid, Gene Expression Profiling, Membrane Proteins, RNA-Binding Proteins, Sequence Analysis, DNA, Virus Internalization, biology.organism_classification, Recombinant Proteins, Influenza A virus subtype H5N1, Transmembrane protein, 3. Good health, Ducks, 030104 developmental biology, Vesicular stomatitis virus, Influenza in Birds, Insect Science, Host-Pathogen Interactions, Chickens, medicine.drug
Abstract: Interferon-inducible transmembrane proteins (IFITMs) can restrict the entry of a wide range of viruses. IFITM3 localizes to endosomes and can potently restrict the replication of influenza A viruses (IAV) and several other viruses that also enter host cells through the endocytic pathway. Here, we investigate whether IFITMs are involved in protection in ducks, the natural host of influenza virus. We identify and sequence duck IFITM1 , IFITM2 , IFITM3 , and IFITM5 . Using quantitative PCR (qPCR), we demonstrate the upregulation of these genes in lung tissue in response to highly pathogenic IAV infection by 400-fold, 30-fold, 30-fold, and 5-fold, respectively. We express each IFITM in chicken DF-1 cells and show duck IFITM1 localizes to the cell surface, while IFITM3 localizes to LAMP1-containing compartments. DF-1 cells stably expressing duck IFITM3 (but not IFITM1 or IFITM2) show increased restriction of replication of H1N1, H6N2, and H11N9 IAV strains but not vesicular stomatitis virus. Although duck and human IFITM3 share only 38% identity, critical residues for viral restriction are conserved. We generate chimeric and mutant IFITM3 proteins and show duck IFITM3 does not require its N-terminal domain for endosomal localization or antiviral function; however, this N-terminal end confers endosomal localization and antiviral function on IFITM1. In contrast to mammalian IFITM3, the conserved YXXθ endocytosis signal sequence in the N-terminal domain of duck IFITM3 is not essential for correct endosomal localization. Despite significant structural and amino acid divergence, presumably due to host-virus coevolution, duck IFITM3 is functional against IAV. IMPORTANCE Immune IFITM genes are poorly conserved across species, suggesting that selective pressure from host-specific viruses has driven this divergence. We wondered whether coevolution between viruses and their natural host would result in the evasion of IFITM restriction. Ducks are the natural host of avian influenza A viruses and display few or no disease symptoms upon infection with most strains, including highly pathogenic avian influenza. We have characterized the duck IFITM locus and identified IFITM3 as an important restrictor of several influenza A viruses, including avian strains. With only 38% amino acid identity to human IFITM3, duck IFITM3 possesses antiviral function against influenza virus. Thus, despite long coevolution of virus and host effectors in the natural host, influenza virus evasion of IFITM3 restriction in ducks is not apparent.
Published: 2015
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21. Defense genes missing from the flight division

Author: Graham A. D. Blyth, Ximena Fleming-Canepa, Alysson H. Blaine, Katharine E. Magor, Kristina Petkau, Domingo Miranzo Navarro, and Megan R.W. Barber
Subjects: animal structures, animal diseases, viruses, Ubiquitin-Protein Ligases, Immunology, chemical and pharmacologic phenomena, Major histocompatibility complex, Article, RIG-I, Duck, Major Histocompatibility Complex, Avian Proteins, Tapasin, Orthomyxoviridae Infections, Interferon, MHC class I, medicine, Animals, Receptors, Immunologic, TLR8, Mammals, biology, pathway, RNA, virus diseases, Bacterial Infections, Immunoglobulin D, Virology, Chicken, Biological Evolution, Immunity, Innate, Gene Expression Regulation, Host-Pathogen Interactions, Interferon Regulatory Factors, biology.protein, Lymph node, Antibody, Chickens, Developmental Biology, medicine.drug, Signal Transduction
Abstract: Highlights • Avian genomes contain a smaller immune repertoire. • TLR8, RIG-I and downstream components are missing in chickens. • Birds are missing IgD, and ducks make a truncated IgY. • Chicken leukocyte Ig-like receptors are missing in ducks. • Birds have a minimal MHC that affects function., Birds have a smaller repertoire of immune genes than mammals. In our efforts to study antiviral responses to influenza in avian hosts, we have noted key genes that appear to be missing. As a result, we speculate that birds have impaired detection of viruses and intracellular pathogens. Birds are missing TLR8, a detector for single-stranded RNA. Chickens also lack RIG-I, the intracellular detector for single-stranded viral RNA. Riplet, an activator for RIG-I, is also missing in chickens. IRF3, the nuclear activator of interferon-beta in the RIG-I pathway is missing in birds. Downstream of interferon (IFN) signaling, some of the antiviral effectors are missing, including ISG15, and ISG54 and ISG56 (IFITs). Birds have only three antibody isotypes and IgD is missing. Ducks, but not chickens, make an unusual truncated IgY antibody that is missing the Fc fragment. Chickens have an expanded family of LILR leukocyte receptor genes, called CHIR genes, with hundreds of members, including several that encode IgY Fc receptors. Intriguingly, LILR homologues appear to be missing in ducks, including these IgY Fc receptors. The truncated IgY in ducks, and the duplicated IgY receptor genes in chickens may both have resulted from selective pressure by a pathogen on IgY FcR interactions. Birds have a minimal MHC, and the TAP transport and presentation of peptides on MHC class I is constrained, limiting function. Perhaps removing some constraint, ducks appear to lack tapasin, a chaperone involved in loading peptides on MHC class I. Finally, the absence of lymphotoxin-alpha and beta may account for the observed lack of lymph nodes in birds. As illustrated by these examples, the picture that emerges is some impairment of immune response to viruses in birds, either a cause or consequence of the host-pathogen arms race and long evolutionary relationship of birds and RNA viruses.
Published: 2013

22. Status of the NPDGamma experiment

Author: C. Garcia, E. Frlež, E. Askanazi, S. Balascuta, Dinko Pocanic, D. Evans, P. N. Seo, H. Nann, Kyle B. Grammer, M. Musgrave, Gregory S. Mitchell, Bernhard Lauss, R. Mahurin, D. Blyth, F. Simmons, Geoffrey Greene, V.W. Yuan, E. Tang, L. Kabir, S. A. Page, J. R. Calarco, Ricardo Alarcon, C. Hayes, Timothy Chupp, Yi-De Zhang, T. Tong, Erik B. Iverson, C. E. Coppola, L. Barrón-Palos, Alexander Barzilov, W. Fox, Charles Fieseler, I. Garishvili, K. Craycraft, J. Stuart, F. W. Hersman, Y. Li, Z. Tang, M. Sharma, R. Allen, Christopher Crawford, J. Vanderwerp, Gordon L. Jones, P. E. Mueller, J. Hamblen, Yasuhiro Masuda, S. I. Penttilä, Robert Milburn, S. Baeßler, A. Salas-Bacci, C. Fu, D. Parsons, Ivan Novikov, E. I. Sharapov, Takashi Ino, Nadia Fomin, S. Kucucker, Stuart J. Freedman, J. Thomison, W. D. Ramsay, Michael Gericke, C. Blessinger, M. Maldonado-Velázquez, J. Fry, M. Dabaghyan, R. C. Gillis, M. McCrea, S. Waldecker, J. Mei, T. B. Smith, J. D. Bowman, S. Santra, Suguru Muto, W. M. Snow, W. Xu, W. S. Wilburn, and J. Favela
Subjects: Nuclear and High Energy Physics, Particle physics, Meson, media_common.quotation_subject, Nuclear Theory, Hadron, Weak interaction, 01 natural sciences, 7. Clean energy, Asymmetry, Nuclear physics, 0103 physical sciences, Neutron, Physical and Theoretical Chemistry, Nuclear Experiment, 010306 general physics, media_common, Physics, 010308 nuclear & particles physics, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Neutron capture, Physics::Accelerator Physics, High Energy Physics::Experiment, Nucleon, Spallation Neutron Source
Abstract: The NPDGamma experiment measures the parity-violating (PV) gamma asymmetry from polarized cold neutrons captured on protons at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). The (PV) neutron spin asymmetry A γ of photons from polarized cold neutron capture on protons is proportional to the ΔI=1 long range weak meson coupling $h_{\pi }^{1}$ between nucleons in the hadronic weak interaction (HWI). Liquid para-hydrogen production data taking concluded in April 2014 and once the background aluminum asymmetry measurements are complete, the PV asymmetry A γ can be extracted. Preliminary results of the analysis of A γ are presented.
Published: 2016
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23. Computing the nonabelian tensor squares of polycyclic groups

Author: Robert Fitzgerald Morse and Russell D. Blyth
Subjects: Algebra, Mathematics::Group Theory, Algebra and Number Theory, Basis (linear algebra), Polycyclic groups, Computation, Tensor (intrinsic definition), Nilpotent groups, Polycyclic group, Nonabelian tensor square, Astrophysics::Galaxy Astrophysics, Square (algebra), Mathematics
Abstract: In this paper we develop a theory for computing the nonabelian tensor square and related computations for finitely presented groups and specialize it to polycyclic groups. This theory provides a framework for making nonabelian tensor square computations for polycyclic groups and is the basis of an algorithm for computing the nonabelian tensor square for any polycyclic group.
Published: 2009
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24. Measurement of the scattering cross section of slow neutrons on liquid parahydrogen from neutron transmission

Author: K. Craycraft, S. Kucuker, D. Blyth, L. Barrón-Palos, M. Maldonado-Velázquez, Z. Tang, P. E. Mueller, Michael Gericke, R. Mahurin, H. Nann, J. D. Bowman, J. Fry, Kyle B. Grammer, R. C. Gillis, M. Musgrave, Ricardo Alarcon, N. Fomin, E. Martin, G. L. Greene, C. Hayes, W. M. Snow, D. Evans, S. I. Penttilä, Christopher Crawford, W. S. Wilburn, J. Hamblen, M. McCrea, and J. R. Calarco
Subjects: Physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Neutron scattering, Condensed Matter Physics, 01 natural sciences, Small-angle neutron scattering, Neutron time-of-flight scattering, Neutron temperature, Electronic, Optical and Magnetic Materials, Nuclear physics, 0103 physical sciences, Neutron cross section, Neutron, Nuclear Experiment (nucl-ex), Atomic physics, Nuclear Experiment, 010306 general physics, Neutron moderator, Spallation Neutron Source
Abstract: Liquid hydrogen is a dense Bose fluid whose equilibrium properties are both calculable from first principles using various theoretical approaches and of interest for the understanding of a wide range of questions in many body physics. Unfortunately, the pair correlation function $g(r)$ inferred from neutron scattering measurements of the differential cross section $d\sigma \over d\Omega$ from different measurements reported in the literature are inconsistent. We have measured the energy dependence of the total cross section and the scattering cross section for slow neutrons with energies between 0.43~meV and 16.1~meV on liquid hydrogen at 15.6~K (which is dominated by the parahydrogen component) using neutron transmission measurements on the hydrogen target of the NPDGamma collaboration at the Spallation Neutron Source at Oak Ridge National Laboratory. The relationship between the neutron transmission measurement we perform and the total cross section is unambiguous, and the energy range accesses length scales where the pair correlation function is rapidly varying. At 1~meV our measurement is a factor of 3 below the data from previous work. We present evidence that these previous measurements of the hydrogen cross section, which assumed that the equilibrium value for the ratio of orthohydrogen and parahydrogen has been reached in the target liquid, were in fact contaminated with an extra non-equilibrium component of orthohydrogen. Liquid parahydrogen is also a widely-used neutron moderator medium, and an accurate knowledge of its slow neutron cross section is essential for the design and optimization of intense slow neutron sources. We describe our measurements and compare them with previous work., Comment: Edited for submission to Physical Review B
Published: 2015
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25. ON COMPUTING THE NON-ABELIAN TENSOR SQUARES OF THE FREE 2-ENGEL GROUPS

Author: Joanne L. Redden, Robert Fitzgerald Morse, and Russell D. Blyth
Subjects: Discrete mathematics, Pure mathematics, G-module, Solvable group, General Mathematics, Elementary abelian group, Tensor product of modules, Rank of an abelian group, Free abelian group, Schur multiplier, Mathematics, Non-abelian group
Abstract: In this paper we compute the non-abelian tensor square for the free 2-Engel group of rank $n>3$. The non-abelian tensor square for this group is a direct product of a free abelian group and a nilpotent group of class 2 whose derived subgroup has exponent 3. We also compute the non-abelian tensor square for one of the group’s finite homomorphic images, namely, the Burnside group of rank $n$ and exponent 3.AMS 2000 Mathematics subject classification: Primary 20F05; 20F45. Secondary 20F18
Published: 2004
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26. Go-HEP: libraries for High Energy Physics analyses in Go

Author: Emmanuel Busato, Peter Waller, Michaël Ughetto, S. Binet, D. Blyth, and Bastian Wieck
Subjects: Particle physics, 010308 nuclear & particles physics, Computer science, 0103 physical sciences, 010306 general physics, 01 natural sciences
Published: 2017
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27. Measurement of the weak nucleon-nucleon interaction by polarized cold neutron capture on protons

Author: D. Blyth and Ricardo Alarcon
Subjects: Physics, media_common.quotation_subject, QC1-999, Hadron, Nuclear Theory, Parity (physics), Weak interaction, Asymmetry, Nuclear physics, Neutron capture, Neutron, Nucleon, Nuclear Experiment, Spallation Neutron Source, media_common
Abstract: The NPDGamma Experiment at the Spallation Neutron Source at Oak Ridge National Laboratory is measuring the parity-odd correlation between the neutron spin and the direction of the emitted photon in the capture of polarized cold neutrons on protons. A parity violating asymmetry from this process is directly related to the strength of the hadronic weak interaction between nucleons. The experiment was run first with heavier nuclear targets to check systematic e ects, false asymmetries, and backgrounds. Since early 2012 the experiment has been collecting data with a 16-liter liquid parahydrogen target. Data taking will continue through 2013 until statistics for a 10 8 asymmetry mea- surement are expected. The experiment performance will be discussed as well as the status of the asymmetry measurements.
Published: 2014

28. The solvability of groups with nilpotent minimal coverings

Author: Francesco Fumagalli, Marta Morigi, Russell D. Blyth, R.D. Blyth, F. Fumagalli, and M. Morigi
Subjects: Finite group, Algebra and Number Theory, group theory, cover of a group, almost simple groups, Group (mathematics), Almost simple group, Group Theory (math.GR), Combinatorics, Nilpotent, Mathematics::Group Theory, Cardinality, Simple (abstract algebra), 20D99, 20E32, 20D15, Cover of a group, finite group, FOS: Mathematics, Minimal counterexample, Finite set, Mathematics - Group Theory, Mathematics
Abstract: A covering of a group is a finite set of proper subgroups whose union is the whole group. A covering is minimal if there is no covering of smaller cardinality, and it is nilpotent if all its members are nilpotent subgroups. We complete a proof that every group that has a nilpotent minimal covering is solvable, starting from the previously known result that a minimal counterexample is an almost simple finite group.
Published: 2014
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29. Flash ADC data processing with correlation coefficients

Author: D. Blyth, D. Mcfarland, J. R. Comfort, and M. Gibson
Subjects: Physics, Nuclear and High Energy Physics, Data processing, Physics - Instrumentation and Detectors, Correlation coefficient, Noise (signal processing), FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Flash ADC, High Energy Physics - Experiment, Data flow diagram, High Energy Physics - Experiment (hep-ex), Data acquisition, Electronic engineering, Sensitivity (control systems), Field-programmable gate array, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Instrumentation
Abstract: The large growth of flash ADC techniques for processing signals, especially in applications of streaming data, raises issues such as data flow through an acquisition system, long-term storage, and greater complexity in data analysis. In addition, experiments that push the limits of sensitivity need to distinguish legitimate signals from noise. The use of correlation coefficients is examined to address these issues. They are found to be quite successful well into the noise region. The methods can also be extended to Field Programmable Gate Array modules for compressing the data flow and greatly enhancing the event rate capabilities., 9 pages, 2 figures
Published: 2013

30. Insoluble groups with the rewriting property P8

Author: Russel D. Blyth and Derek J. S. Robinson
Subjects: Combinatorics, Discrete mathematics, Semidirect product, Algebra and Number Theory, Subgroup, Degree (graph theory), Group (mathematics), Simple group, Primitive permutation group, Alternating group, Abelian group, Mathematics
Abstract: Let n be an integer greater than 1, and let G be a group. An n -tuple x 1 , x 2 ,… x n of elements of G is called rewritable if there is a nontrivial permutation π of {1,2…, n } such that x 1 x 2 … x = x π (2)⋯ x π (π) . the group G is said to have the rewriting property P n if every n -tuple of G is rewritable. The authors have previously shown that all groups with P 7 are soluble, whereas the alternating group A 5 has P 8 . Thus the least n for which P n contains a nonabelian simple group is 8. In this article the authors confirm conjectures of R. Brandl concerning the structure of insoluble groups with P 8 . In particular, let G be an insoluble group. Then G has the rewriting property P 8 if and only if it is a semidirect product H ⋉ K where H is abelian. K is isomorphic with the alternating group of degree 5, and | H : C H ( K )| = 1 or 2.
Published: 1991
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31. Some structural results on the non-abelian tensor square of groups

Author: Russell D. Blyth, Francesco Fumagalli, Marta Morigi, R. Blyth, F. Fumagalli, and M. Morigi
Subjects: Discrete mathematics, Pure mathematics, Algebra and Number Theory, Group (mathematics), NON-ABELIAN TENSOR SQUARE, Commutator subgroup, 20F05, 20F14, 20F99, 20J99, Cyclic group, Group Theory (math.GR), Square (algebra), Nilpotent, Free product, FOS: Mathematics, Nilpotent group, Abelian group, Mathematics - Group Theory, Mathematics
Abstract: We study the non-abelian tensor square $G\otimes G$ for the class of groups G that are finitely generated modulo their derived subgroup. In particular, we find conditions on G/G' so that $G\otimes G$ is isomorphic to the direct product of $\nabla(G)$ and the non-abelian exterior square $G\wedge G$. For any group G, we characterize the non-abelian exterior square $G\wedge G$ in terms of a presentation of G. Finally, we apply our results to some classes of groups, such as the classes of free soluble and free nilpotent groups of finite rank, and some classes of finite p-groups.
Published: 2008

32. Detectors for in vivo range and dose verification in proton therapy

Author: D. Blyth, Ricardo Alarcon, Lauren Ice, Martin Bues, Mirek Fatyga, G. Randall, Jason Holmes, and E. Galyaev
Subjects: Physics, Range (particle radiation), Nuclear magnetic resonance, Optics, Proton, business.industry, Instrumentation, Detector, Bragg peak, MicroMegas detector, business, Proton therapy, Collimated light
Abstract: Particle detection instrumentation to address the in vivo verifications of proton dose and range is under development as part of a proton therapy research program focused on patient quality assurance. For in vivo proton range verification, a collimated gamma detector array is under construction to indirectly measure the position of the Bragg peak for each proton beam spot to within 1–2 mm precision. For dose flux verification, a proton fluence detector based on the technology of the Micromegas is under construction. This detector has an active area of about 100 cm2, coordinate resolution of better than 1 mm, and handling of incident proton beam fluxes of 109–1013 particles/s.
Published: 2016
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33. The case for formal methods in standards

Author: C. Ruggles, C. Boldyreff, Nik Tetteh-Lartey, and D. Blyth
Subjects: Standardization, business.industry, Process (engineering), Computer science, media_common.quotation_subject, Formal methods, Expression (mathematics), Formal specification, Conceptual model, Quality (business), Software engineering, business, Software, Natural language, media_common
Abstract: It is argued that applying formal methods to standards making would result in more accurate, more understandable, and more useful standards. The main benefit seen in using formal methods in a standard's development and expression is improving the standard's quality. In the early stages of standards development, formal methods can result in considerable clarification during the development and expression of the underlying conceptual model for a standard or family of related standards. They can also define precisely the relation among the components of both the standard being developed and other standards. Later in the development process, formal methods can improve a standard's quality during its use by letting it be expressed clearly, unambiguously, and concisely in a way that natural language does not allow. Finally, formal methods can aid standards development at the maintenance stage, for example, by allowing the adequacy of a proposed change to be proved. Guidelines for applying formal methods in the standardization process are provided. >
Published: 1990
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34. FIRST EVIDENCE OF HARD SCATTERING PROCESSES IN SINGLE TAGGED GAMMA-GAMMA-COLLISIONS

Author: ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I and ALEKSAN, R ALEKSEEV, GD ALLPORT, PP ALMEHED, S ALMEIDA, FML ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANDRIEUX, ML and ANTILOGUS, P APEL, WD ARNOUD, Y ASMAN, B AUGUSTIN, JE and AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A and BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M and BAUBILLIER, M BAUDOT, J BECKS, KH BEGALLI, M and BEILLIERE, P BELTRAN, P BENVENUTI, AC BERGGREN, M and BERTRAND, D BIANCHI, F BIGI, M BILENKY, MS BILLOIR, P and BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN and BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL and BORISOV, G BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O and BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M and BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H and BRICMAN, C BRILLAULT, L BROWN, RCA BRUNET, JM BUGGE, L BURAN, T BUYS, A CACCIA, M CALVI, M CAMACHOROZAS, AJ CAMPORESI, T CANALE, V CANEPA, M CANKOCAK, K CAO, F CARENA, F CARRILHO, P CARROLL, L CASO, C CASSIO, V and CASTILLOGIMENEZ, MV CATTAI, A CAVALLO, FR CERRITO, L and CHABAUD, V CHAN, A CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHLIAPNIKOV, P CHOROWICZ, V and CHRIN, JTM CINDRO, V COLLINS, P CONTRERAS, JL and CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB and CRENNELL, D CROSETTI, G MAESTRO, JC CZELLAR, S and DAHLJENSEN, E DAHM, J DALMAGNE, B DAM, M DAMGAARD, G and DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DASILVA, W and DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A and DEBOECK, H DEBOER, W DEBRABANDERE, S DECLERCQ, C and DEFEZLASO, MDM DELAVAISSIERE, C DELOTTO, B DEMIN, A and DEPAULA, L DESAINTJEAN, C DIJKSTRA, H DICIACCIO, L and DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M and DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D and EHRET, R EKELOF, T EKSPONG, G ELSING, M ENGEL, JP and ERSHAIDAT, N SANTO, ME FASSOULIOTIS, D FEINDT, M FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E and FONTANELLI, F FORMENTI, F FOUSSET, JL FRANEK, B and FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R and FULDAQUENZER, F FURSTENAU, H FUSTER, J GAMBA, D and GANDELMAN, M GARCIA, C GARCIA, J GASPAR, C GASPARINI, U and GAVILLET, P GAZIS, EN GELE, D GERBER, JP GILLESPIE, D GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY and GOPAL, G GORN, L GORSKI, M GRACCO, V GRARD, F and GRAZIANI, E GROSDIDIER, G GUNNARSSON, P GUY, J and HAEDINGER, U HAHN, F HAHN, M HAHN, S HAIDER, S and HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K HAO, W and HARRIS, FJ HEDBERG, V HENRIQUES, R HERNANDEZ, JJ and HERNANDO, JA HERQUET, P HERR, H HESSING, TL HIGON, E and HILKE, HJ HILL, TS HOLMGREN, SO HOLT, PJ HOLTHUIZEN, D and HONORE, PF HOULDEN, M HRUBEC, J HUET, K HULTQVIST, K and IOANNOU, P IVERSEN, PS JACKSON, JN JACOBSSON, R and JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JONSSON, L JUILLOT, P KAISER, M KALMUS, G and KAPUSTA, F KARLSSON, M KARVELAS, E KATARGIN, A and KATSANEVAS, S KATSOUFIS, EC KERANEN, R KHOMENKO, BA and KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A and KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P and KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V and KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KREUTER, C and KROLIKOWSKI, J KRONKVIST, I KRUPINSKI, W KULKA, K and KURVINEN, K LACASTA, C LAKTINEH, I LAMBROPOULOS, C and LAMSA, JW LANCERI, L LANGEFELD, P LAPIN, V LAST, I and LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V and LESIAK, T LEVY, JM LIEB, E LIKO, D LINDNER, R and LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG and LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D and LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J and MAIO, A MALTEZOS, A MANDL, F MARCO, J MARECHAL, B and MARGONI, M MARIN, JC MARIOTTI, C MARKOU, A MARON, T and MARTI, S MARTINEZRIVERO, C MARTINEZVIDAL, F MATORRAS, F and MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEDBO, J MERONI, C MEYER, WT MIAGKOV, A and MICHELOTTO, M MIGLIORE, E MIKULEC, I MIRABITO, L and MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T and MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H and MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL and NAVAS, S NEGRI, P NEMECEK, S NEUMANN, W NEUMEISTER, N NICOLAIDOU, R NIELSEN, BS NIKOLAENKO, V NISS, P and NOMEROTSKI, A NORMAND, A OBRAZTSOV, V OLSHEVSKI, AG and ORAVA, R OSTERBERG, K OURAOU, A PAGANINI, P PAGANONI, M and PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F and PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L and PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C and PETROLINI, A PHILLIPS, HT PIANA, G PIERRE, F PIMENTA, M and PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G and POROPAT, P POZDNIAKOV, V PREST, M PRIVITERA, P PULLIA, A and RADOJICIC, D RAGAZZI, S RAHMANI, H RAMES, J RATOFF, PN READ, AL REALE, M REBECCHI, P RADAELLI, NG and REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F and RICHARDSON, J RIDKY, J RINAUDO, G RIPP, I ROMERO, A and RONCAGLIOLO, I RONCHESE, P ROOS, L ROSENBERG, EI ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V and RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G and SALT, J SANCHEZ, J SANNINO, M SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SEUFERT, R SHELLARD, RC SICCAMA, I and SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN and SKAALI, TB SMADJA, G SMIRNOVA, O SMITH, GR SOKOLOV, A and SOSNOWSKI, R SOUZASANTOS, D SPASSOV, T SPIRITI, E and SCUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVITSKI, I STAVROPOULOS, G STEPANIAK, K STICHELBAUT, F STOCCHI, A and STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M TABARELLI, T TCHIKILEV, O THEODOSIOU, GE and THOME, Z TILQUIN, A TIMMERMANS, J TIMOFEEV, VG and TKATCHEV, LG TODOROV, T TOET, DZ TOMARADZE, A TOME, B and TORASSA, E TORTORA, L TRANSTROMER, G TREILLE, D and TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA and TYNDEL, M TZAMARIAS, S UEBERSCHAER, B UEBERSCHAER, S and ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV and VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDONINCK, WK and VANELDIK, J VEGNI, G VENTURA, L VENUS, W VERBEURE, F and VERLATO, M VERTOGRADOV, LS VILANOVA, D VINCENT, P and VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M and VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F and WEHR, A WEIERSTALL, M WEILHAMMER, P WETHERELL, AM and WICKENS, JH WIELERS, M WILKINSON, GR WILLIAMS, WSC and WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YIP, K and YUSHCHENKO, O ZACH, F ZAITSEV, A ZALEWSKA, A ZALEWSKI, P and ZAVRTANIK, D ZEVGOLATAKOS, E ZIMIN, NI ZITO, M and ZONTAR, D ZUBERI, R ZUCCHELLI, GC ZUMERLE, G
Subjects: High Energy Physics::Lattice, High Energy Physics::Phenomenology, High Energy Physics::Experiment
Abstract: For the first time, multihadronic production from single tagged gamma gamma collisions has been studied, where one of the scattered leptons was tagged at very low virtual photon absolute mass squared ([Q(2)] = 0.06 (GeV/c(2))(2)). Data collected during 1991 and 1992 in the DELPHI experiment at LEP are shown to agree well with predictions which included the non-perturbative vector meson dominance model in which the interacting photons are assumed to have converted into a vector meson (rho, omega or pi), a quark-parton model which describes direct photon interactions and a QCD-based model which considers the photon to have quark and gluon structure functions. Five different parametrizations of these structure functions were used and the predictions compared with the data. This study confirms recent results from no-tag experiments in requiring a QCD-based component to successfully describe the data, indicating that the photon has a significant partonic content.
Published: 1995

35. Measurement of the forward-backward asymmetry of e+e-→Z→ {Mathematical expression} using prompt leptons and a lifetime tag

Author: Abreu, P. Adam, W. Adye, T. Agasi, E. Ajinenko, I. Aleksan, R. Alekseev, G.D. Allport, P.P. Almehed, S. Almeida, F.M.L. Alvsvaag, S.J. Amaldi, U. Andreazza, A. Antilogus, P. Apel, W.-D. Apsimon, R.J. Arnoud, Y. Åsman, B. Augustin, J.-E. Augustinus, A. Baillon, P. Bambade, P. Barao, F. Barate, R. Barbiellini, G. Bardin, D.Y. Barker, G.J. Baroncelli, A. Barring, O. Barrio, J.A. Bartl, W. Bates, M.J. Battaglia, M. Baubillier, M. Baudot, J. Becks, K.-H. Begalli, M. Beilliere, P. Belokopytov, Yu. Beltran, P. Benvenuti, A.C. Berggren, M. Bertrand, D. Bianchi, F. Bigi, M. Bilenky, M.S. Billoir, P. Bjarne, J. Bloch, D. Blyth, S. Bocci, V. Bogolubov, P.N. Bolognese, T. Bonesini, M. Bonivento, W. Booth, P.S.L. Borisov, G. Bosio, C. Bostjancic, B. Bosworth, S. Botner, O. Bouquet, B. Bourdarios, C. Bowcock, T.J.V. Bozzo, M. Braibant, S. Branchini, P. Brand, K.D. Brenner, R.A. Briand, H. Brieman, C. Brillault, L. Brown, R.C.A. Bruckman, P. Brunet, J.-M. Bugge, L. Buran, T. Buys, A. Caccia, M. Calvi, M. Camacho Rozas, A.J. Campion, R. Camporesi, T. Canale, V. Cankocak, K. Cao, F. Carena, F. Carrilho, P. Carroll, L. Cases, R. Caso, C. Cassio, V. Castillo Gimenez, M.V. Cattai, A. Cavallo, F.R. Cerrito, L. Chabaud, V. Chan, A. Charpentier, Ph. Chaussard, L. Chauveau, J. Checchia, P. Chelkov, G.A. Chliapnikov, P. Chorowicz, V. Chrin, J.T.M. Cindro, V. Collins, P. Contreras, J.L. Contri, R. Cortina, E. Cosme, G. Cossutti, F. Couchot, F. Crawley, H.B. Crennell, D. Crosetti, G. Cuevas Maestro, J. Czellar, S. Dahl-Jensen, E. Dahm, J. Dalmagne, B. Dam, M. Damgaard, G. Daubie, E. Daum, A. Dauncey, P.D. Davenport, M. Davies, J. Da Silva, W. Defoix, C. Della Ricca, G. Delpierre, P. Demaria, N. De Angelis, A. De Boeck, H. De Boer, W. De Brabandere, S. De Clercq, C. De Fez Laso, M.D.M. De La Vaissiere, C. De Lotto, B. De Min, A. De Paula, L. De Saint-Jean, C. Dijkstra, H. Di Ciaccio, L. Djama, F. Dolbeau, J. Donszelmann, M. Doroba, K. Dracos, M. Drees, J. Dris, M. Dufour, Y. Dupont, F. Edsall, D. Ehret, R. Ekelof, T. Ekspong, G. Elsing, M. Engel, J.-P. Ershaidat, N. Santo, M.E. Fassouliotis, D. Feindt, M. Ferrer, A. Filippas, T.A. Firestone, A. Foeth, H. Fokitis, E. Fontanelli, F. Formenti, F. Fousset, J.-L. Franek, B. Frenkiel, P. Fries, D.C. Frodesen, A.G. Fruhwirth, R. Fulda-Quenzer, F. Furstenau, H. Fuster, J. Gamba, D. Gandelman, M. Garcia, C. Garcia, J. Gaspar, C. Gasparini, U. Gavillet, Ph. Gazis, E.N. Gele, D. Gerber, J.-P. Gerdyukov, L. Gillespie, D. Gokieli, R. Golob, B. Golovatyuk, V.M. Gomez Y Cadenas, J.J. Gopal, G. Gorn, L. Gorski, M. Gracco, V. Grard, F. Graziani, E. Grosdidier, G. Gunnarsson, P. Guy, J. Haedinger, U. Hahn, F. Hahn, M. Hahn, S. Haider, S. Hajduk, Z. Hakansson, A. Hallgren, A. Hamacher, K. Hao, W. Harris, F.J. Hedberg, V. Henriques, R. Hernandez, J.J. Hernando, J.A. Herquet, P. Herr, H. Hessing, T.L. Higon, E. Hilke, H.J. Hill, T.S. Holmgren, S.-O. Holt, P.J. Holthuizen, D. Honore, P.F. Houlden, M. Hrubec, J. Huet, K. Hultqvist, K. Ioannou, P. Iversen, P.-S. Jackson, J.N. Jacobsson, R. Jalocha, P. Jarlskog, G. Jarry, P. Jean-Marie, B. Johansson, E.K. Jonsson, L. Juillot, P. Kaiser, M. Kalmus, G. Kapusta, F. Karlsson, M. Karvelas, E. Katsanevas, S. Katsoufis, E.C. Keranen, R. Khomenko, B.A. Khovanski, N.N. King, B. Kjaer, N.J. Klein, H. Klovning, A. Kluit, P. Koch-Mehrin, A. Koehne, J.H. Koene, B. Kokkinias, P. Koratzinos, M. Korytov, A.V. Kostioukhine, V. Kourkoumelis, C. Kouznetsov, O. Kramer, P.-H. Krammer, M. Kreuter, C. Krolikowski, J. Kronkvist, I. Krupinski, W. Kucewicz, W. Kulka, K. Kurvinen, K. Lacasta, C. Laktineh, I. Lambropoulos, C. Lamsa, J.W. Lanceri, L. Langefeld, P. Lapin, V. Last, I. Laugier, J.-P. Lauhakangas, R. Leder, G. Ledroit, F. Leitner, R. Lemoigne, Y. Lemonne, J. Lenzen, G. Lepeltier, V. Levy, J.M. Lieb, E. Liko, D. Lindner, R. Lipniacka, A. Lippi, I. Loerstad, B. Lokajicek, M. Loken, J.G. Lopez-Fernandez, A. Lopez Aguera, M.A. Los, M. Loukas, D. Lozano, J.J. Lutz, P. Lyons, L. Maehlum, G. Maillard, J. Maio, A. Maltezos, A. Mandl, F. Marco, J. Marechal, B. Margoni, M. Marin, J.-C. Mariotti, C. Markou, A. Maron, T. Marti, S. Martinez-Rivero, C. Martinez-Vidal, F. Matorras, F. Matteuzzi, C. Matthiae, G. Mazzucato, M. Cubbin, M.M. Kay, R.M. Nulty, R.M. Medbo, J. Meroni, C. Meyer, W.T. Miagkov, A. Michelotto, M. Migliore, E. Mirabito, L. Mitaroft, W.A. Mitselmakher, G.V. Mjoernmark, U. Moa, T. Moeller, R. Moenig, K. Monge, M.R. Morettini, P. Mueller, H. Murray, W.J. Muryn, B. Myatt, G. Naraghi, F. Navarria, F.L. Negri, P. Nemecek, S. Neumann, W. Neumeister, N. Nicolaidou, R. Nielsen, B.S. Nikolaenko, V. Niss, P. Nomerotski, A. Normand, A. Obraztsov, V. Olshevski, A.G. Orava, R. Osterberg, K. Ouraou, A. Paganini, P. Paganoni, M. Pain, R. Palka, H. Papadopoulou, Th.D. Pape, L. Parodi, F. Passeri, A. Pegoraro, M. Pennanen, J. Peralta, L. Pernegger, H. Pernicka, M. Perrotta, A. Petridou, C. Petrolini, A. Phillips, H.T. Piana, G. Pierre, F. Pimenta, M. Plaszczynski, S. Podobrin, O. Pol, M.E. Polok, G. Poropat, P. Pozdiniakov, V. Prest, M. Privitera, P. Pullia, A. Radojicic, D. Ragazzi, S. Rahmani, H. Rames, J. Ratoff, P.N. Read, A.L. Reale, M. Rebecchi, P. Redaelli, N.G. Regler, M. Reid, D. Renton, P.B. Resvanis, L.K. Richard, F. Richardson, J. Ridky, J. Rinaudo, G. Ripp, I. Romero, A. Roncagliolo, I. Ronchese, P. Roos, L. Rosenberg, E.I. Rosso, E. Roudeau, P. Rovelli, T. Ruckstuhl, W. Ruhlmann-Kleider, V. Ruiz, A. Saarikko, H. Sacquin, Y. Sajot, G. Salt, J. Sanchez, J. Sannino, M. Schneider, H. Schyns, M.A.E. Sciolla, G. Scuri, F. Segar, A.M. Seitz, A. Sekulin, R. Seufert, R. Shellard, R.C. Siccama, I. Siegrist, P. Simonetti, S. Simonetto, F. Sisakian, A.N. Skaali, T.B. Smadja, G. Smirnov, N. Smirnova, O. Smith, G.R. Sokolov, A. Sosnowski, R. Souza-Santos, D. Spassov, T. Spiriti, E. Squarcia, S. Staeck, H. Stanescu, C. Stapnes, S. Stavitski, I. Stavropoulos, G. Stepaniak, K. Stichelbaut, F. Stocchi, A. Strauss, J. Straver, J. Strub, R. Stugu, B. Szczekowski, M. Szeptycka, M. Tabarelli, T. Tchikilev, O. Theodosiou, G.E. Thome, Z. Tilquin, A. Timmermans, J. Timofeev, V.G. Tkatchev, L.G. Todorov, T. Toet, D.Z. Tomaradze, A. Tome, B. Torassa, E. Tortora, L. Transtromer, G. Treille, D. Trischuk, W. Tristram, G. Troncon, C. Tsirou, A. Tsyganov, E.N. Turluer, M.-L. Tuuva, T. Tyapkin, I.A. Tyndel, M. Tzamarias, S. Ueberschaer, B. Ueberschaer, S. Ullaland, O. Uvarov, V. Valenti, G. Vallazza, E. Valls Ferrer, J.A. Vander Velde, C. Van Apeldoorn, G.W. Van Dam, P. Van Der Heijden, M. Van Doninck, W.K. Van Eldik, J. Vegni, G. Ventura, L. Venus, W. Verbeure, F. Verlato, M. Vertogradov, L.S. Vilanova, D. Vincent, P. Vitale, L. Vlasov, E. Vodopyanov, A.S. Vollmer, M. Voutilainen, M. Vrba, V. Wahlen, H. Walck, C. Wehr, A. Weierstall, M. Weilhammer, P. Wetherell, A.M. Wickens, J.H. Wielers, M. Wilkinson, G.R. Williams, W.S.C. Winter, M. Witek, M. Wormser, G. Woschnagg, K. Yip, K. Yushchenko, O. Zach, F. Zaitsev, A. Zalewska, A. Zalewski, P. Zavrtanik, D. Zevgolatakos, E. Zimin, N.I. Zito, M. Zontar, D. Zuberi, R. Zumerle, G.
Subjects: High Energy Physics::Phenomenology, High Energy Physics::Experiment
Abstract: The forward-backward asymmetry of the process e+e-→Z→b {Mathematical expression} has been measured using events collected by the DELPHI experiment during the 1991 and 1992 LEP runs. This data sample corresponded to 884 000 hadronic Z decays at a centre-of-mass energy {Mathematical expression}. The tagging of b-quark events was performed using two approaches; the first was based on the semileptonic decay channels b→X+μ and b→X+e, the second used a lifetime tag with jet-charge reconstruction. The results of these two methods were combined to give {Mathematical expression} With the semileptonic sample, the forward-backward asymmetry of the process e+e-→Z→ {Mathematical expression} was also measured to be {Mathematical expression} The effective value of the Weinberg mixing angle derived from these measurements was {Mathematical expression} © 1995 Springer-Verlag.
Published: 1995

36. Measurement of the triple-gluon vertex from 4-jet events at LEP

Author: Abreu, P. Adam, W. Adye, T. Agasi, E. Aleksan, R. Alekseev, G.D. Algeri, A. Allen, P. Almehed, S. Alsvaag, S.J. Amaldi, U. Andreazza, A. Antilogus, P. Apel, W.-D. Apsimon, R.J. Arnoud, Y. Åsman, B. Augustin, J.-E. Augustinus, A. Baillon, P. Bambade, P. Barao, F. Barate, R. Barbiellini, G. Bardin, D.Y. Barker, G.J. Baroncelli, A. Barring, O. Barrio, J.A. Bartl, W. Bates, M.J. Battaglia, M. Baubillier, M. Becks, K.-H. Beeston, C.J. Begalli, M. Beilliere, P. Belokopytov, Yu. Beltran, P. Benedic, D. Benvenuti, A.C. Berggren, M. Bertrand, D. Bianchi, F. Bilenky, M.S. Billoir, P. Bjarne, J. Bloch, D. Blyth, S. Bocci, V. Bogolubov, P.N. Bolognese, T. Bonesini, M. Bonivento, W. Booth, P.S.L. Borisov, G. Borner, H. Bosio, C. Bostiancic, B. Bosworth, S. Botner, O. Bouquet, B. Bourdarios, C. Bowcock, T.J.V. Bozzo, M. Braibant, S. Branchini, P. Brand, K.D. Brenner, R.A. Briand, H. Bricman, C. Brown, R.C.A. Brummer, N. Brunet, J.-M. Bugge, L. Buran, T. Burmeister, H. Buytaert, J.A.M.A. Caccia, M. Calvi, M. Camacho Rozas, A.J. Campion, R. Camporesi, T. Canale, V. Cao, F. Carena, F. Carroll, L. Caso, C. Castillo Gimenez, M.V. Cattai, A. Cavallo, F.R. Cerrito, L. Chabaud, V. Chan, A. Chapkin, M. Charpentier, Ph. Chaussard, L. Chauveau, J. Checchia, P. Chelkov, G.A. Chevalier, L. Chliapnikov, P. Chorowicz, V. Chrin, J.T.M. Collins, P. Contreras, J.L. Contri, R. Cortina, E. Cosme, G. Couchot, F. Crawley, H.B. Crennell, D. Crosetti, G. Crozon, M. Cuevas Maestro, J. Czellar, S. Dahl-Jensen, E. Dalmagne, B. Dam, M. Damgaard, G. Darbo, G. Daubie, E. Daum, A. Dauncey, P.D. Davenport, M. David, P. Davies, J. Da Silva, W. Defoix, C. Delpierre, P. Demaria, N. De Angelis, A. De Boeck, H. De Boer, W. De Clerq, C. De Fez Laso, M.D.M. De Groot, N. De La Vaissiere, C. De Lotto, B. De Min, A. Dijkstra, H. Di Ciaccio, L. Dolbeau, J. Donszelmann, M. Doroba, K. Dracos, M. Drees, J. Dris, M. Dufour, Y. Dupont, F. Edsall, D. Eek, L.-O. Eerola, P.A.-M. Ehret, R. Ekelof, T. Ekspong, G. Elliot Peisert, A. Engel, J.-P. Ershaidat, N. Fassouliotis, D. Feindt, M. Fernandez Alonso, M. Ferrer, A. Filippas, T.A. Firestone, A. Foeth, H. Fokitis, E. Fontanelli, F. Forbes, K.A.J. Fousset, J.-L. Francon, S. Franek, B. Frenkiel, P. Fries, D.C. Frodesen, A.G. Fruhwirth, R. Fulda-Quenzer, F. Furnival, K. Furstenau, H. Fuster, J. Gamba, D. Garcia, C. Garcia, J. Gaspar, C. Gasparini, U. Gavillet, Ph. Gazis, E.N. Gerber, J.-P. Giacomelli, P. Gokieli, R. Golob, B. Golovatyuk, V.M. Cadenas, J.J.G.Y. Gopal, G. Gorski, M. Gracco, V. Grant, A. Grard, F. Graziani, E. Grosdidier, G. Gross, E. Grosse-Wiesmann, P. Grossetete, B. Guy, J. Haedinger, U. Hahn, F. Hahn, M. Haider, S. Hakansson, A. Hallgren, A. Halpaap, M. Hamacher, K. De Monchenault, G.H. Hao, W. Harris, F.J. Hedberg, V. Henkes, T. Hernandez, J.J. Herquet, P. Herr, H. Hessing, T.L. Hietanen, I. Higgins, C.O. Higon, E. Hilke, H.J. Hodgson, S.D. Hofmokl, T. Holmes, R. Holmgren, S.-O. Holthuizen, D. Honore, P.F. Hooper, J.E. Houlden, M. Hrubec, J. Huet, K. Hulth, P.O. Hultqvist, K. Ioannou, P. Iversen, P.-S. Jackson, J.N. Jalocha, P. Jarlskog, G. Jarry, P. Jean-Marie, B. Johansson, E.K. Johnson, D. Jonker, M. Jonsson, L. Juillot, P. Kalkanis, G. Kalmus, G. Kapusta, F. Karlsson, M. Karvelas, E. Katsanevas, S. Katsoufis, E.C. Keranen, R. Kesteman, J. Khomenko, B.A. Khovanski, N.N. King, B. Kjaer, N.J. Klein, H. Klovning, A. Kluit, P. Koch-Mehrin, A. Koehne, J.H. Koene, B. Kokkinias, P. Koratzinos, M. Korytov, A.V. Kostioukhine, V. Kourkoumelis, C. Kouznetsov, O. Kramer, P.H. Krolikowski, J. Kronkvist, I. Kruener-Marquis, U. Krupinski, W. Kulka, K. Kurvinen, K. Lacasta, C. Lambropoulos, C. Lamsa, J.W. Lanceri, L. Lapin, V. Laugier, J.-P. Lauhakangas, R. Leder, G. Ledroit, F. Leitner, R. Lemoigne, Y. Lemonne, J. Lenzen, G. Lepeltier, V. Lesiak, T. Levy, J.M. Lieb, E. Liko, D. Lindgren, J. Lindner, R. Lipniacka, A. Lippi, I. Loerstad, B. Lokajicek, M. Loken, J.G. Lopez-Fernandez, A. Aguera, M.A.L. Los, M. Loukas, D. Lozano, J.J. Lutz, P. Lyons, L. Maehlum, G. Maillard, J. Maio, A. Maltezos, A. Mandl, F. Marco, J. Margoni, M. Marin, J.-C. Markou, A. Maron, T. Marti, S. Mathis, L. Matorras, F. Matteuzzi, C. Matthiae, G. Mazzucato, M. Mc Cubbin, M. Mc Kay, R. Mc Nulty, R. Meola, G. Meroni, C. Meyer, W.T. Michelotto, M. Mikulec, I. Mirabito, L. Mitaroff, W.A. Mitselmakher, G.V. Mjoernmark, U. Moa, T. Moeller, R. Moenig, K. Monge, M.R. Morettini, P. Mueller, H. Murray, W.J. Muryn, B. Myatt, G. Navarria, F.L. Negri, P. Nicolaidou, R. Nielsen, B.S. Nijjhar, B. Nikolaenko, V. Nilsen, P.E.S. Niss, P. Nomerotski, A. Obraztsov, V. Olshevski, A.G. Orava, R. Ostankov, A. Osterberg, K. Ouraou, A. Paganoni, M. Pain, R. Palka, H. Papadopoulou, Th.D. Pape, L. Parodi, F. Passeri, A. Pegoraro, M. Pennanen, J. Peralta, L. Perevozchikov, V. Pernegger, H. Pernicka, M. Perrotta, A. Petridou, C. Petrolini, A. Pierre, F. Pimenta, M. Pingot, O. Plaszczynski, S. Podobrin, O. Pol, M.E. Polok, G. Poropat, P. Pozdniakov, V. Privitera, P. Pullia, A. Radojicic, D. Ragazzi, S. Rahmani, H. Ratoff, P.N. Read, A.L. Rebecchi, P. Redaelli, N.G. Regler, M. Reid, D. Renton, P.B. Resvanis, L.K. Richard, F. Richardson, M. Ridky, J. Rinaudo, G. Roditi, I. Romero, A. Roncagliolo, I. Ronchese, P. Ronnqvist, C. Rosenberg, E.I. Rossi, S. Rosso, E. Roudeau, P. Rovelli, T. Ruckstuhl, W. Ruhlmann-Kleider, V. Ruiz, A. Rybicki, K. Saarikko, H. Sacquin, Y. Sajot, G. Salt, J. Sanchez, J. Sannino, M. Schael, S. Schneider, H. Schyns, M.A.E. Sciolla, G. Scuri, F. Segar, A.M. Seitz, A. Sekulin, R. Sessa, M. Sette, G. Seufert, R. Shellard, R.C. Siccama, I. Siegrist, P. Simonetti, S. Simonetto, F. Sisakian, A.N. Skjevling, G. Smadja, G. Smirnov, N. Smirnova, O. Smith, G.R. Sosnowski, R. Souza-Santos, D. Spassoff, T.S. Spiriti, E. Squarcia, S. Staeck, H. Stanescu, C. Stapnes, S. Stavropoulos, G. Stichelbaut, F. Stocchi, A. Strauss, J. Straver, J. Strub, R. Stugu, B. Szczekowski, M. Szeptycka, M. Szymanski, P. Tabarelli, T. Tchikilev, O. Theodosiou, G.E. Tilquin, A. Timmermans, J. Timofeev, V.G. Tkatchev, L.G. Todorov, T. Toet, D.Z. Toker, O. Tome, B. Torassa, E. Tortora, L. Treille, D. Trevisan, U. Trischuk, W. Tristram, G. Troncon, C. Tsirou, A. Tsyganov, E.N. Turala, M. Turluer, M.-L. Tuuva, T. Tyapkin, I.A. Tyndel, M. Tzamarias, S. Ueberschaer, S. Ullaland, O. Uvarov, V. Valenti, G. Vallazza, E. Valls Ferrer, J.A. Vander Velde, C. Van Apeldoorn, G.W. Van Dam, P. Van Der Heijden, M. Van Doninck, W.K. Vaz, P. Vegni, G. Ventura, L. Venus, W. Verbeure, F. Verlato, M. Vertogradov, L.S. Vilanova, D. Vincent, P. Vitale, L. Vlasov, E. Vodopyanov, A.S. Vollmer, M. Voutilainen, M. Vrba, V. Wahlen, H. Walck, C. Waldner, F. Wayne, M. Wehr, A. Weierstall, M. Weilhammer, P. Werner, J. Wetherell, A.M. Wickens, J.H. Wilkinson, G.R. Williams, W.S.C. Winter, M. Witek, M. Wormser, G. Woschnagg, K. Yamdagni, N. Yepes, P. Zaitsev, A. Zalewska, A. Zalewski, P. Zavrtanik, D. Zevgolatakos, E. Zhang, G. Zimin, N.I. Zito, M. Zuberi, R. Funchal, R.Z. Zumerle, G. Zuniga, J.
Subjects: High Energy Physics::Lattice, High Energy Physics::Phenomenology, High Energy Physics::Experiment
Abstract: From the combined data of 1990 and 1991 of the DELPHI experiment at LEP, 13057 4-jet events are obtained and used for determining the contribution of the triple-gluon vertex. The relevant variables are the generalized Nachtmann Reiter angle θNR* and the opening angle of the two least energetic jets. A fit to their two-dimensional distribution yields Mathematical expression where CA/CF is the ratio of the coupling strength of the triple-gluon vertex to that of gluon bremsstrahlung from quarks, and NC/NA, the ratio of the number of quark colours to the number of gluons. This constitutes a convincing model-independent proof of the existence of the triple-gluon vertex, since its contribution is directly proportional to CA/CF. The results are in agreement with the values expected from QCD:CA/CF=2.25, and NC/NA=3/8. © 1993 Springer-Verlag.
Published: 1993

37. A SEARCH FOR LEPTON FLAVOR VIOLATION IN Z0 DECAYS

Author: ABREU, P ADAM, W ADYE, T AGASI, E ALEKSEEV, GD and ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U and ANASSONTZIS, EG ANDREAZZA, A ANTILOGUS, P APEL, WD and APSIMON, RJ ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G and BARDIN, DY BARKER, G BARONCELLI, A BARRING, O BARRIO, JA and BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y and BELTRAN, P BENEDIC, D BENVENUTI, AC BERGGREN, M and BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J and BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORGEAUD, P and BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S and BOTNER, O BOUDINOV, E BOUQUET, B BOURDARIOS, C and BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD and BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H and BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R and CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L and CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P CHAUSSARD, L and CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L and CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E and COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G and CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E and DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E and DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DAVIES, J and DASILVA, W DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P DEMARIA, N DERKAOUI, J DEANGELIS, A DEBOECK, H and DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N and DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H and DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F and EEK, LO EROLA, PAM EHRET, R EKELOF, T EKSPONG, G and PEISERT, AE ENGEL, JP ERSHAIDAT, N FASSOULIOTIS, D and FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A and FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ and FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC and FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K and FURSTENAU, H FUSTER, J GAMBA, D GARCIA, C GARCIA, J and GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B GOLOVATYUK, VM and CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M GRACCO, V and GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E and GROSSEWIESMANN, P GROSSETETE, B GUY, J HAEDINGER, U and HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A and HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H and HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ and HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO and HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J and HUET, K HULTH, PO HULTQVIST, K IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G and JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M and JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC and KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN and KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A and KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P and KOPF, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V and KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KROLIKOWSKI, J and KRONKVIST, I KRUENERMARQUIS, U KUCEWICZ, W KULKA, K and KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW and LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G and LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D and LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I and LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A and AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P and LYONS, L MAEHLUM, G MAILLARD, J MALTEZOS, A MANDL, F and MARCO, J MARGONI, M MARIN, JC MARKOU, A MARON, T and MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G and MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I and MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U and MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P and MUELLER, H MURRAY, WJ MYATT, G NAVARRIA, FL NEGRI, P and NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P and OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A and OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H and PAPADOPOULOU, TD PAPE, L PASSERI, A PEGORARO, M and PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A and PETRIDOU, C PETROLINI, A PETROVYKH, L PETTERSEN, TE and PIERRE, F PIMENTA, M PINGOT, O PLASZCZYNSKI, S POL, ME and POLOK, G POROPAT, P PRIVITERA, P PULLIA, A and RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL and REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G and RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P and RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSI, U ROSSO, E and ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V and RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J and SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHULZE, B and SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEKULIN, R and SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I and SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN and SKJEVLING, G SMADJA, G SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C and STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A and STRAUSS, J STRAVER, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE and TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG and TODOROV, T TOET, DZ TOKER, O TORASSA, E TORTORA, L and TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML TUUVA, T and TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S and ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV and VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W and VERBEURE, F VERTOGRADOV, LS VILANOVA, D VINCENT, P and VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEHR, A WEIERSTALL, M WEILHAMMER, P and WERNER, J WETHERELL, AM WICKENS, JH WILKINSON, GR and WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K and YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A and ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J
Abstract: A search for lepton flavour violation through the decays Z0 –> emu, etau and mutau was made with the DELPHI detector at LEP, using a sample corresponding to an integrated luminosity of 11.2 pb-1. The number of candidates was consistent with the estimated background. The upper limit on the branching ratio (at 95% confidence level) for Z0 –> emu was 3.2 x 10(-5), for Z0 –> etau was 10.8 x 10(-5) and for Z0 –> mutau was 13.5 x 10(-5).
Published: 1993

38. MEASUREMENT OF INCLUSIVE PRODUCTION OF LIGHT MESON RESONANCES IN HADRONIC DECAYS OF THE Z0

Author: ABREU, P ADAM, W ADYE, T AGASI, E ALEKSEEV, GD and ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U and ANASSONTZIS, EG ANDREAZZA, A ANTILOGUS, P APEL, WD and APSIMON, RJ ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G and BARDIN, DY BARKER, G BARONCELLI, A BARRING, O BARRIO, JA and BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y and BELTRAN, P BENEDIC, D BENVENUTI, AC BERGGREN, M and BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J and BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORGEAUD, P and BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S and BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV and BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA and BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA and CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T and CANALE, V CAO, F CARENA, F CARROLL, L CASO, C and GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V and CHAN, A CHAPKIN, M CHARPENTIER, P CHAUSSARD, L and CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L and CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CLARA, MP and COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G and COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G and CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A and DAUNCEY, PD DAVENPORT, M DAVID, P DAVIES, J DASILVA, W and DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P and DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DECLERCQ, C and LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B and DEMIN, A DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J and DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M and DUFOUR, Y DUPONT, F EEK, LO EEROLA, PAM EHRET, R and EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP ERSHAIDAT, N and FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A and FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E and FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R and FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J and GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U and GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOOBAR, A and GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F and GRAZIANI, E GROSDIDIER, G GROSS, E GROSSEWIESMANN, P and GROSSETETE, B GUY, J HAEDINGER, U HAHN, F HAHN, M and HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K and DEMONCHENAULT, GH HAO, W HARRIS, FJ HENKES, T and HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I and HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF and HOOPER, JE HOULDEN, M HRUBEC, J HUET, K HULTH, PO and HULTQVIST, K IOANNOU, P ISENHOWER, D IVERSEN, PS and JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B and JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L and JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M and KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R and KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ and KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORCYL, K and KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I KRUENERMARQUIS, U KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C and LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R and LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T and LEVY, JM LIEB, E LIKO, D LINDGREN, J LINDNER, R and LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG and LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D and LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J and MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC and MARKOU, A MARON, T MARTI, S MATHIS, L MATORRAS, F and MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT and MICHELOTTO, M MIKULEC, I MIRABITO, L MITAROFF, WA and MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ and MYATT, G NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B and NIKOLAENKO, V NILSEN, PES NISS, P OBRAZTSOV, V and OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD and PAPE, L PASSERI, A PEGORARO, M PENNANEN, J and PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PETRIDOU, C and PETROLINI, A PETTERSEN, TE PIERRE, F PIMENTA, M PINGOT, O PLASZCZYNSKI, S POL, ME POLOK, G POROPAT, P and PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D and RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M and RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I and RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S and ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W and RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHULZE, B SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F and SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOV, N SMITH, GR and SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S and STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G and STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R and SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T and TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J and TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O and TOMARADZE, A TORASSA, E TORTORA, L TREILLE, D and TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A and TSYGANOV, EN TURLUER, ML TUUVA, T TYAPKIN, IA and TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O and UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV and VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M and VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W and VERBEURE, F VERTOGRADOV, LS VILANOVA, D VINCENT, P and VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEHR, A WEIERSTALL, M WEILHAMMER, P and WERNER, J WETHERELL, AM WICKENS, JH WILKINSON, GR and WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K and YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A and ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J
Abstract: A study of inclusive production of the meson resonances rho0, K*0 (892), f0(975) and f2(1270) in hadronic decays of the Z0 is presented. The measured mean meson multiplicity per hadronic event is 0.83 +/- 0.14 for the rho0, 0.64 +/- 0.24 for the K*0(892). 0.10 +/- 0.04 for the f0(975) in the momentum range p > 0.05p(beam) (x(p) > 0.05) and 0.11 +/- 0.05 for the f2 (1270) for x(p) > 0. 1. These values and the corresponding differential cross sections (1/sigma(hadr)) dsigma/dx(p) for the vector mesons are in good agreement with the predictions of the JETSET 7.3 PS and HFRWIG 5.4 models. The f2 (1270) production is overestimated by HERWIG but its x(p)-shape is correctly reproduced. The measured ratios of the production cross sections sigma (f2(1270))/sigma(rho0) = 0.22 +/- 0.08 and sigma(f2(1270))/sigma(f0(975)) = 3(-1)+7 for x(p) > 0.1 are consistent with the results obtained in hadronic reactions.
Published: 1993

39. MEASUREMENT OF LAMBDA-B PRODUCTION AND LIFETIME IN Z0 HADRONIC DECAYS

Author: ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I and ALEKSAN, R ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, S and ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P and APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE and AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R and BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A and BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M and BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M and BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D and BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F and BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S and BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M and BONIVENTO, W BOOTH, PSL BORISOV, G BORNER, H BOSIO, C and BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B and BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S and BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C and BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T and BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M and ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CAO, F and CARENA, F CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A and CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M and CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P and CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V and CHRIN, JTM COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E and COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D and CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A and DAUNCEY, PD DAVENPORT, M DAVID, P DAVIES, J DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N DEANGELIS, A and DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N and DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H and DICIACCIO, L DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D and EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G and PEISERT, AE ENGEL, JP ERSHAIDAT, N FASSOULIOTIS, D and FEINDT, M FENYUK, A ALONSO, MF FERRER, A FILIPPAS, TA and FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F and FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P and FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F and FURNIVAL, K FURSTENAU, H FUSTER, J GAMBA, D GARCIA, C and GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B and GOLOVATYUK, VM GOMEZ, JJ CADENAS, Y GOPAL, G GORN, L and GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E and GROSDIDIER, G GROSS, E GROSSEWIESMANN, P GROSSETETE, B and GUY, J HAEDINGER, U HAHN, F HAHN, M HAIDER, S and HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K and DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENKES, T and HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL and HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD and HOFMOKL, T HOLMGREN, SO HOLTHUIZEN, D HONORE, PF and HOOPER, JE HOULDEN, M HRUBEC, J HUET, K HULTH, PO and HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK and JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G and KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E and KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J and KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H and KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORCYL, K KORYTOV, AV and KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH and KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUENERMARQUIS, U and KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C and LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R and LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T and LEVY, JM LIEB, E LIKO, D LINDGREN, J LINDNER, R and LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG and LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D and LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J and MAIO, A MALTEZOS, A MANDL, F MARCO, J MARGONI, M and MARIN, JC MARKOU, A MARON, T MARTI, S MATORRAS, F and MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT and MICHELOTTO, M MIKULEC, I MIRABITO, L MITAROFF, WA and MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ and MYATT, G NAVARRIA, FL NEGRI, P NICOLAIDOU, R NIELSEN, BS and NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P and NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R and OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R and PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H and PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PIERRE, F PIMENTA, M PINGOT, O PLASZCZYNSKI, S PODOBRIN, O and POL, ME POLOK, G POROPAT, P POZDNIAKOV, V PRIVITERA, P and PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REBECCHI, P REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M and RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I and RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S and ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W and RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A and SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC and SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F and SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOFF, TS SPIRITI, E and SQUARCIA, S STAECK, H STANESCU, C STAPNES, S and STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J and STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M and SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE and TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG and TODOROV, T TOET, DZ TOKER, O TOME, B TORASSA, E and TORTORA, L TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML and TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E and FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P and VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS and VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V WAHLEN, H and WALCK, C WALDNER, F WEHR, A WEIERSTALL, M WEILHAMMER, P and WERNER, J WETHERELL, AM WICKENS, JH WILKINSON, GR and WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K and YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A and ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J
Subjects: High Energy Physics::Phenomenology, High Energy Physics::Experiment, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics::Earth and Planetary Astrophysics
Abstract: Evidence for the production of b-flavoured baryons in Z0 decays is reported from the analysis of 365 000 hadronic events collected by the DELPHI detector. Assuming that most of the weakly decaying b flavoured baryons produced by the Z0 are LAMBDA(b), the observed signal of (LAMBDAl- + LAMBDAl+BAR) pairs, where l is a high transverse momentum lepton in the same jet as the LAMBDA, leads to a production rate: f (b –> LAMBDA(b)) x Br(LAMBDA(b) –> LAMBDAlnuX) = (0.41 +/- 0.13 +/- 0.09)%. Using a sample of 18 reconstructed LAMBDA(b) decay vertices, the lifetime is determined to be tau(LAMBDA(b)) = ( 1.04(-0.38)+0.48 +/- 0.10) ps.
Published: 1993

40. A MEASUREMENT OF THE TAU LIFETIME

Author: ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R and ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ and AMALDI, U ANASSONTZIS, EG ANDREAZZA, A ANTILOGUS, P and APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE and AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R and BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A and BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M and BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M and BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D and BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F and BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S and BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M and BONIVENTO, W BOOTH, PSL BORISOV, G BORNER, H BOSIO, C and BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B and BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S and BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C and BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T and BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M and ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CAO, F and CARENA, F CARROLL, L GIMENEZ, MVC CATTAI, A CAVALLO, FR and CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P and CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA and CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM and CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E and COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D and CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E and DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DAVIES, J and DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N and DEANGELIS, A DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD and DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A and DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J and DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M and DUFOUR, Y DUPONT, F EEK, LO EEROLA, PAM EHRET, R and EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP ERSHAIDAT, N and FASSOULIOTIS, D FEINDT, M FENYUK, A ALONSO, MF and FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E and FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S and FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J and GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U and GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOOBAR, A and GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F and GRAZIANI, E GROSDIDIER, G GROSS, E GROSSEWIESMANN, P and GROSSETETE, B GUMENYUK, S GUY, J HAEDINGER, U HAHN, F and HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A and HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ and HEDBERG, V HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H and HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO and HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J and HUET, K HULTH, PO HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P and JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F and KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC and KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P and KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P and KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V and KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KROLIKOWSKI, J and KRONKVIST, I KRUENERMARQUIS, U KUCEWICZ, W KULKA, K and KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW and LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G and LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D and LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I and LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A and AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P and LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A and MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A and MARON, T MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C and MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R and MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P and MUELLER, H MURRAY, WJ MYATT, G NAVARRIA, FL NEGRI, P and NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES and NISS, P OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A and OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R and PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M and PERROTTA, A PETRIDOU, C PETROLINI, A PETTERSEN, TE and PIERRE, F PIMENTA, M PINGOT, O PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A and RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D RENTON, PB and RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P and RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSI, U ROSSO, E and ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V and RUIZ, A RYBIN, A SAARIKKO, H SACQUIN, Y SAJOT, G and SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H and SCHULZE, B SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM and SEITZ, A SEKULIN, R SESSA, M SETTE, G SEUFERT, R and SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S and SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOFF, TS SPIRITI, E and SQUARCIA, S STAECK, H STANESCU, C STAPNES, S and STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J and STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M and SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE and TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG and TODOROV, T TOET, DZ TOKER, O TOME, B TORASSA, E and TORTORA, L TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML and TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E and FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P and VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M VERTOGRADOV, LS and VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOULGARIS, G VOUTILAINEN, M VRBA, V and WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEHR, A and WEIERSTALL, M WEILHAMMER, P WERNER, J WETHERELL, AM and WICKENS, JH WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P and ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D and ZEYGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R and FUNCHAL, RZ ZUMERLE, G ZUNIGA, J
Subjects: High Energy Physics::Experiment
Abstract: The tau lepton lifetime is measured using four different methods with the DELPHI detector. Three measurements using one prong decays are combined, accounting for correlations, resulting in tau(tau) = 298 +/- 7 (stat.) +/- 4 (syst.) fs while the decay length distribution of three prong decays gives tau(tau) = 298 +/- 13 (stat.) +/- 5 (syst.) fs. The combined result is tau(tau) = 298 +/- 7 fs. The ratio of the Fermi coupling constant from tau decay relative to that from muon decay is found to be 0.985 +/- 0.013, compatible with lepton universality.
Published: 1993

41. A MEASUREMENT OF THE MEAN LIFETIMES OF CHARGED AND NEUTRAL B-HADRONS

Author: ABREU, P ADAM, W ADYE, T AGASI, E AJINENKO, I and ALEKSAN, R ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, S and ALVSVAAG, SJ AMALDI, U ANDREAZZA, A ANTILOGUS, P and APEL, WD APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE and AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R and BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A and BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M and BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M and BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D and BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F and BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S and BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M and BONIVENTO, W BOOTH, PSL BORISOV, G BORNER, H BOSIO, C and BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B and BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S and BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C and BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T and BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M and ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CAO, F and CARENA, F CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A and CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P and CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA and CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM and COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G and COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G and CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A DAUNCEY, PD and DAVENPORT, M DAVID, P DAVIES, J DASILVA, W DEFOIX, C and DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H and DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N and DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H and DICIACCIO, L DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D and EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G and PEISERT, AE ENGEL, JP ERSHAIDAT, N FALALEEV, V and FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F and FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P and FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F and FURNIVAL, K FURSTENAU, H FUSTER, J GAMBA, D GARCIA, C and GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B and GOLOVATYUK, VM CADENAS, JJGY GOPAL, G GORN, L GORSKI, M and GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E GROSSEWIESMANN, P GROSSETETE, B GUY, J and HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAKANSSON, A and HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENKES, T HERNANDEZ, JJ HERQUET, P and HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E and HILKE, HJ HODGSON, SD HOFMOKL, T HOLMGREN, SO and HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J and HUET, K HULTH, PO HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P and JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F and KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC and KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P and KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P and KORATZINOS, M KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C and KOUZNETSOV, O KRAMER, PH KREUTER, C KROLIKOWSKI, J and KRONKVIST, I KRUENERMARQUIS, U KRUPINSKI, W KULKA, K and KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW and LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G and LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D and LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I and LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A and AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P and LYONS, L MAEHLUM, G MAILLARD, J MAIO, A MALTEZOS, A and MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A and MARON, T MARTI, S MATORRAS, F MATTEUZZI, C MATTHIAE, G and MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I and MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U and MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P and MUELLER, H MURRAY, WJ MURYN, B MYATT, G NAVARRIA, FL and NEGRI, P NICOLAIDOU, R NIELSEN, BS NIJJHAR, B and NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A and OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A and OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H and PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M and PERROTTA, A PETRIDOU, C PETROLINI, A PIERRE, F PIMENTA, M PINGOT, O PLASZCZYNSKI, S PODOBRIN, O POL, ME and POLOK, G POROPAT, P POZDNIAKOV, V PRIVITERA, P PULLIA, A and RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REBECCHI, P REDAELLI, NG REGLER, M REID, D and RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I and RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSO, E and ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V and RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G and SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H and SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A and SEKULIN, R SESSA, M SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN and SKJEVLING, G SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR and SOSNOWSKI, R SOUZASANTOS, D SPASSOFF, TS SPIRITI, E and SQUARCIA, S STAECK, H STANESCU, C STAPNES, S and STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J and STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M and SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE and TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG and TODOROV, T TOET, DZ TOKER, O TOME, B TORASSA, E and TORTORA, L TRIELLE, D TRISCHUK, W TRISTRAM, G TRONCON, C and TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S and ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV and VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W and VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D and VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M and VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F and WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J and WETHERELL, AM WICKENS, JH WILKINSON, GR WILLIAMS, WSC and WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YAMDAGNI, N and YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P and ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M and ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J
Subjects: High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Nuclear Experiment, Astrophysics::Galaxy Astrophysics
Abstract: The decays of B-hadrons have been reconstructed using the charged particles recorded in the DELPHI silicon microstrip detector. The sum of the charges of the secondaries determines the charge of the B-hadron parent. Some 232 114 multihadronic Z0 decays recorded during the 1991 run of LEP at centre-of-mass energies between 88.2 GeV and 94.2 GeV yield 253 B-hadron candidates with well-measured charge. From these the mean lifetimes of neutral and charged B-hadrons are found to be 1.44 +/- 0.21(stat.) +/- 0.14(syst.) ps and 1.56 +/- 0.19(stat.) +/- 0.13(syst.) ps respectively. The ratio of their lifetimes is 1.09(-0.23)+0.28 (Stat.) +/- 0.11 (syst.). Under some assumptions on the abundance and lifetime of the LAMBDA(b)0 and B(s)0 states, the B0 and B+ lifetimes are inferred.
Published: 1993

42. DETERMINATION OF ALPHA-S FROM THE SCALING VIOLATION IN THE FRAGMENTATION FUNCTIONS IN E+E- ANNIHILATION

Author: ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R and ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ and AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD and APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R and BARBIELLINI, G BARDIN, DY BARKER, GI BARONCELLI, A and BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M and BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M and BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D and BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F and BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S and BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M and BONIVENTO, W BOOTH, PSL BORISOV, G BORNER, H BOSIO, C and BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B and BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S and BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C and BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T and BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M and ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CAO, F and CARENA, F CARROLL, L GIMENEZ, MVC CATTAI, A CAVALLO, FR and CERRITO, L CHABAUD, V CHAN, A CHAPKIN, M and CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P and CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V and CHRIN, JTM COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E and COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D and CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E and DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DAVIES, J and DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N and DEANGELIS, A DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD and DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A and DIJKSTRA, H DICIACCIO, L DOLBEAU, J DONSZELMANN, M and DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y and DUPONT, F EDSALL, D EEK, LO EEROLA, PAM EHRET, R and EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP ERSHAIDAT, N and FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A and FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E and FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R and FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J and GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U and GAVILLET, P GAZIS, EN GERBER, JP GERDYUKOV, L and GIACOMELLI, P GOKIELI, R GOLOB, B GOLOVATYUK, VM and CADENAS, JJGY GOPAL, G GORN, L GORSKI, M GRACCO, V and GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E and GROSSEWIESMANN, P GROSSETETE, B GUY, J HAEDINGER, U and HAHN, F HAHN, M HAIDER, S HAKANSSON, A HALLGREN, A and HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H and HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ and HODGSON, SD HOFMOKL, T HOLMGREN, SO HOLTHUIZEN, D and HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HUET, K and HULTH, PO HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B and JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P and KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M and KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R and KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ and KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORYTOV, AV and KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH and KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUENERMARQUIS, U and KRUPINSKI, W KULKA, K KURVINEN, K KUSSMAUL, T LACASTA, C and LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V and LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V and LESIAK, T LEVY, JM LIEB, E LIKO, D LINDGREN, J and LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M and LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G and MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J and MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S and MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M and MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C and MEYER, WT MICHELOTTO, M MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R and MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ and MURYN, B MYATT, G NAVARRIA, FL NEGRI, P NICOLAIDOU, R NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES and NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M and PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F and PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A and PETROVYKH, L PIERRE, F PIMENTA, M PINGOT, O and PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P and POZDNIAKOV, V PRIVITERA, P PULLIA, A RADOJICIC, D and RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REBECCHI, P and REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G and RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P and RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSO, E ROUDEAU, P and ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A and RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J and SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE and SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A SEKULIN, R and SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I and SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN and SKJEVLING, G SMADJA, G SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOFF, TS SPIRITI, E SQUARCIA, S and STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G and STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R and STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P and TABARELLI, T TCHIKILEV, O THEODOSIOU, GE TILQUIN, A and TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOME, B TORASSA, E TORTORA, L TREILLE, D and TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C and TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T and TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S and ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV and VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W and VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D and VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M and VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F and WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J and WETHERELL, AM WICKENS, JH WILKINSON, GR WILLIAMS, WSC and WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YAMDAGNI, N and YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P and ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M and ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J
Subjects: High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract: A determination of the hadronic fragmentation functions of the Z0 boson is presented from a study of the inclusive hadron production with the DELPHI detector at LEP. These fragmentation functions were compared with the ones at lower energies, thus covering data in a large kinematic range: 196 less-than-or-equal-to Q2 less-than-or-equal-to 8312 GeV2 and x (= p(h)/E(beam)) > 0.08. A large scaling violation was observed, which was used to extract the strong coupling constant in second order QCD: alpha(s)(M(Z)) = 0.118 +/- 0.005. The corresponding QCD scale for five quark flavours is: LAMBDA(MS)(5)BAR = 230 +/- 60 MeV.
Published: 1993

43. A measurement of D meson production in Z0 hadronic decays

Author: Abreu, P. Adam, W. Adye, T. Agasi, E. Ajinenko, I. Aleksan, R. Alekseev, G.D. Algeri, A. Allen, P. Almehed, A. Alvsvaag, S.J. Amaldi, U. Andreazza, A. Antilogus, P. Apel, W.-D. Apsimon, R.J. Arnoud, Y. Åsman, B. Augustin, J.-E. Augustinus, A. Baillon, P. Bambade, P. Barao, F. Barate, R. Barbiellini, G. Bardin, D.Y. Barker, G.J. Baroncelli, A. Barring, O. Barrio, J.A. Bartl, W. Bates, M.J. Battaglia, M. Baubillier, M. Becks, K.-H. Beeston, C.J. Begalli, M. Beilliere, P. Belokopyptov, Yu. Beltran, P. Benedic, D. Benvenuti, A.C. Berggren, M. Bertrand, D. Bianchi, F. Bilenky, M.S. Billoir, P. Bjarne, J. Bloch, D. Blyth, S. Bocci, V. Bogolubov, P.N. Bolognese, T. Bonesini, M. Bonivento, W. Booth, P.S.L. Borisov, G. Borner, H. Bosio, C. Bostjancic, B. Bosworth, S. Botner, O. Bouquet, B. Bourdarios, C. Bowcock, T.J.V. Bozzo, M. Braibant, S. Branchini, P. Brand, K.D. Brenner, R.A. Briand, H. Bricman, C. Brown, R.C.A. Brummer, N. Brunet, J.-M. Bugge, L. Buran, T. Burmeister, H. Buytaert, J.A.M.A. Caccia, M. Calvi, M. Camacho Rozas, A.J. Campion, R. Camporesi, T. Canale, V. Cao, F. Carena, F. Carroll, L. Castillo Gimenez, M.V. Cattai, A. Cavallo, F.R. Cerrito, L. Chabaud, V. Chan, A. Chapkin, M. Charpentier, Ph. Chaussard, L. Chauveau, J. Checchia, P. Chelkov, G.A. Chevalier, L. Chliapnikov, P. Chorowicz, V. Chrin, J.T.M. Collins, P. Contreras, J.L. Contri, R. Cortina, E. Cosme, G. Couchot, F. Crawley, H.B. Crennell, D. Crosetti, G. Crozon, M. Cuevas Maestro, J. Czellar, S. Dahl-Jensen, E. Dalmagne, B. Dam, M. Damgaard, G. Darbo, D. Daubie, E. Daum, A. Dauncey, P.D. Davenport, M. Davies, P. De Silva, W. Defoix, C. Delpierre, P. Demaria, N. De Angelis, A. De Boeck, H. De Boer, W. De Clerq, C. De Fez Laso, M.D.M. De Groot, N. De La Vaissiere, C. De Lotto, B. De Min, A. Dijkstra, H. Di Ciaccio, L. Dolbeau, J. Donszelmann, M. Doroba, K. Dracos, M. Drees, J. Dris, M. Dufour, Y. Dupont, F. Edsall, D. Eek, L.-O. Eerola, P.A.-M. Ehret, R. Ekelof, T. Ekspong, G. Elliot Peisert, A. Engel, J.-P. Ershaidat, N. Fassouliotis, D. Feindt, M. Fenyuk, A. Fernandez Alonso, M. Ferrer, A. Filippas, T.A. Firestone, A. Foeth, H. Fokitis, E. Fontanelli, F. Forbes, K.A.J. Fousset, J.-L. Francon, S. Franek, B. Frenkiel, P. Fries, D.C. Frodesen, A.G. Fruhwirth, R. Fulda-Quenzer, F. Furnival, K. Furstenau, H. Fuster, J. Gamba, D. Garcia, C. Garcia, J. Gaspar, C. Gasparini, U. Gavillet, Ph. Gazis, E.N. Gerber, J.-P. Giacomelli, P. Gokieli, R. Golob, B. Golovatyuk, V.M. Gomez Y Cadenas, J.J. Gopal, G. Gorski, M. Gracco, V. Grant, A. Grard, F. Graziani, E. Grosdidier, G. Gross, E. Grosse-Wiesmann, P. Grossetete, B. Guy, J. Haedinger, U. Hahn, F. Hahn, M. Haider, S. Hajduk, Z. Hakansson, A. Hallgren, A. Hamacher, K. Hamel De Monchenault, G. Hao, W. Harris, F.J. Hedberg, V. Henkes, T. Hernandez, J.J. Herquet, P. Herr, H. Hessing, T.L. Hietanen, I. Higgins, C.O. Higon, E. Hilke, H.J. Hodgson, S.D. Hofmokl, T. Holmes, R. Holmgren, S.-O. Holthuizen, D. Honore, P.F. Hooper, J.E. Houlden, M. Hrubec, J. Huet, K. Hulth, P.O. Hultqvist, K. Ioannou, P. Iversen, P.-S. Jackson, J.N. Jalocha, P. Jarlskog, G. Jarry, P. Jean-Marie, B. Johansson, E.K. Johnson, D. Jonker, M. Jonsson, L. Juillot, P. Kalkanis, G. Kalmus, G. Kapusta, F. Karlsson, M. Karvelas, E. Katsanevas, S. Katsoufis, E.C. Keranen, R. Kesteman, J. Khomenko, B.A. Khovanski, N.N. King, B. Kjaer, N.J. Klein, H. Klovning, A. Kluit, P. Koch-Mehrin, A. Köhne, J.H. Koene, B. Kokkinias, P. Koratzinos, M. Korcyl, K. Korytov, A.V. Kostioukhine, V. Kourkoumelis, C. Kouznetsov, O. Kramer, P.H. Krolikowski, J. Kronkvist, I. Kruener-Marquis, U. Kucewicz, W. Kulka, K. Kurvinen, K. Lacasta, C. Lambropoulos, C. Lamsa, J.W. Lanceri, L. Lapin, V. Laugier, J.-P. Lauhakangas, R. Leder, G. Ledroit, F. Leitner, R. Lemoigne, Y. Lemonne, J. Lenzen, G. Lepeltier, V. Lesiak, T. Levy, J.M. Lieb, E. Liko, D. Lindgren, J. Lindner, R. Lipniacka, A. Lippi, I. Loerstad, B. Lokajicek, M. Loken, J.G. Lopez-Fernandez, A. Lopez Aguera, M.A. Los, M. Loukas, D. Lozano, J.J. Lutz, P. Lyons, L. Maehlum, G. Maillard, J. Miao, A. Maltezos, A. Mandl, F. Marco, J. Margoni, M. Marin, J.-C. Markou, A. Maron, T. Marti, S. Mathis, L. Matorras, F. Matteuzzi, C. Matthiae, G. Mazzucato, M. Mc Cubbin, M. Mc Kay, R. Mc Nulty, R. Meola, G. Meroni, C. Meyer, W.T. Michelotto, M. Mikulec, I. Mirabito, L. Mitaroff, W.A. Mitselmakher, G.V. Mjoernmark, U. Moa, T. Moeller, R. Moenig, K. Monge, M.R. Morettini, P. Mueller, H. Murray, W.J. Myatt, G. Navarria, F.L. Negri, P. Nicolaidou, R. Nielsen, B.S. Nijjhar, B. Nikolaenko, V. Nilsen, P.E.S. Niss, P. Nomerotski, A. Obraztsov, V. Olshevski, A.G. Orava, R. Ostankov, A. Osterberg, K. Ouraou, A. Paganoni, M. Pain, R. Palka, H. Papadopoulou, Th.D. Pape, L. Parodi, F. Passeri, A. Pegoraro, M. Pennanen, J. Peralta, L. Pernegger, H. Pernicka, M. Perrotta, A. Petridou, C. Petrolini, A. Pierre, F. Pimenta, M. Pingot, O. Plaszcznski, S. Podobrin, O. Pol, M.E. Polok, G. Poropat, P. Pozdniakov, V. Privitera, P. Pullia, A. Radojicic, D. Ragazzi, S. Rahmani, H. Ratoff, P.N. Read, A.L. Rebecchi, P. Redaelli, N.G. Regler, M. Reid, D. Renton, P.B. Resvanis, L.K. Richard, F. Richardson, M. Ridky, J. Rinaudo, G. Roditi, I. Romero, A. Roncagliolo, I. Ronchese, P. Ronnqvist, C. Rosenberg, E.I. Rossi, S. Rosso, E. Roudeau, P. Rovelli, T. Ruckstuhl, W. Ruhlmann-Kleider, V. Ruiz, A. Saarikko, H. Sacquin, Y. Sajot, G. Salt, J. Sanchez, J. Sannino, M. Schael, S. Schneider, H. Schyns, M.A.E. Sciolla, G. Scuri, F. Segar, A.M. Seitz, A. Sekulin, R. Sessa, M. Sette, G. Seufert, R. Shellard, R.C. Siccama, I. Siegrist, P. Simonetti, S. Simonetto, F. Sisakian, A.N. Skjevling, G. Smadja, G. Smirnova, O. Smith, G.R. Rosnowski, R. Souza-Santos, D. Spassoff, T.S. Spiriti, E. Squarcia, S. Staeck, H. Stanescu, C. Stapnes, S. Stavropoulos, G. Stichelbaut, F. Stocchi, A. Strauss, J. Straver, J. Strub, R. Stugu, B. Szczekowski, M. Szeptycka, M. Szymanski, P. Tabarelli, T. Tchikilev, O. Theodosiou, G.E. Tilquin, A. Timmermans, J. Timofeev, V.G. Tkatchev, L.G. Todorov, T. Toet, D.Z. Toker, O. Tome, B. Torassa, E. Tortora, L. Trielle, D. Trevisan, U. Trischuk, W. Tristram, G. Troncon, C. Tsirou, A. Tsyganov, E.N. Turluer, M.-L. Tuuva, T. Tyapkin, I.A. Tyndel, M. Tzamarias, S. Ueberschaer, S. Ullaland, O. Uvarov, V. Valenti, G. Vallazza, E. Valls Ferrer, J.A. Vander Velde, C. Van Apeldoorn, G.W. Van Dam, P. Van Der Heijden, M. Van Doninck, W.K. Vaz, P. Vegni, G. Ventura, L. Venus, W. Verbeure, F. Verlato, M. Vertogradov, L.S. Vilanova, D. Vincent, P. Vitale, L. Vlasov, E. Vodopyanov, A.S. Vollmer, M. Voutilainen, M. Vrba, V. Wahlen, H. Walck, C. Waldner, F. Wayne, M. Wehr, A. Weierstall, M. Weilhammer, P. Werner, J. Wetherell, A.M. Wickens, J.H. Wilkinson, G.R. Williams, W.S.C. Winter, M. Witek, M. Wormser, G. Woschnagg, K. Yamdagni, N. Yepes, P. Zaitsev, A. Zalewska, A. Zalewski, P. Zavrtanik, D. Zevgolatakos, E. Zhang, G. Zimin, N.I. Zito, M. Zuberi, R. Zukanovich Funchal, R. Zumerle, G. Zuniga, J.
Subjects: High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract: A study of the fragmentation properties of charm and bottom quarks into D mesons is presented. From 263 700 Z0 hadronic decays collected in 1991 with the DELPHI detector at the LEP collider, D0, D+ and D*+ are reconstructed in the modes K-π+, K-π+K+ and D0π+ followed by D0→K-π+, respectively. The fractional decay widths {Mathematical expression} are determined, and first results are presented for the production of D mesons from {Mathematical expression} and {Mathematical expression} events separately. The average energy fraction of D*± in charm quark fragmentation is found to be 〈XE(D*)〉c=0.487± 0.015 (stat)±0.005 (sys.). Assuming that the fraction of Ds and charm-baryons produced at LEP is similar to that around 10 GeV, the Z0 partial width into charm quark pairs is determined to be Γc/Γh=0.187±0.031 (stat)±0.023 (sys). The probability for a b quark to fragment into {Mathematical expression} or b-baryons is inferred to be 0.268±0.094 (stat)±0.100 (sys) from the measured probability that it fragments into a {Mathematical expression} or B-. © 1993 Springer-Verlag.
Published: 1993

44. Determination of αs using the next-to-leading-log approximation of QCD

Author: Abreu, P. Adam, W. Adye, T. Agasi, E. Aleksan, R. Alekseev, G.D. Algeri, A. Allen, P. Almehed, A. Alvsvaag, S.J. Amaldi, U. Andreazza, A. Antilogus, P. Apel, W.-D. Apsimon, R.J. Arnoud, Y. Åsman, B. Augustin, J.-E. Augustinus, A. Baillon, P. Bambade, P. Barao, F. Barate, R. Barbiellini, G. Bardin, D.Y. Barker, G.J. Baroncelli, A. Barring, O. Barrio, J.A. Bartl, W. Bates, M.J. Battaglia, M. Baubillier, M. Becks, K.-H. Beeston, C.J. Begalli, M. Beilliere, P. Belokopyptov, Yu. Beltran, P. Benedic, D. Benvenuti, A.C. Berggren, M. Bertrand, D. Bianchi, F. Bilenky, M.S. Billoir, P. Bjarne, J. Bloch, D. Blyth, S. Bocci, V. Bogolubov, P.N. Bolognese, T. Bonesini, M. Bonivento, W. Booth, P.S.L. Borisov, G. Borner, H. Bosio, C. Bostjancic, B. Bosworth, S. Botner, O. Bouquet, B. Bourdarios, C. Bowcock, T.J.V. Bozzo, M. Braibant, S. Branchini, P. Brand, K.D. Brenner, R.A. Briand, H. Bricman, C. Brown, R.C.A. Brummer, N. Brunet, J.-M. Bugge, L. Buran, T. Burmeister, H. Buytaert, J.A.M.A. Caccia, M. Calvi, M. Camacho Rozas, A.J. Campion, R. Camporesi, T. Canale, V. Cao, F. Carena, F. Carroll, L. Caso, C. Castillo Gimenez, M.V. Cattai, A. Cavallo, F.R. Cerrito, L. Chabaud, V. Chan, A. Chapkin, M. Charpentier, Ph. Chaussard, L. Chauveau, J. Checchia, P. Chelkov, G.A. Chevalier, L. Chliapnikov, P. Chorowicz, V. Chrin, J.T.M. Clara, M.P. Collins, P. Contreras, J.L. Contri, R. Cortina, E. Cosme, G. Couchot, F. Crawley, H.B. Crennell, D. Crosetti, G. Crozon, M. Cuevas Maestro, J. Czellar, S. Dahl-Jensen, E. Dalmagne, B. Dam, M. Damgaard, G. Darbo, G. Daubie, E. Daum, A. Dauncey, P.D. Davenport, M. David, P. Davies, J. Da Silva, W. Defoix, C. Delpierre, P. Demaria, N. De Angelis, A. De Boeck, H. De Boer, W. De Clerq, C. De Fez Laso, M.D.M. De Groot, N. De La Vaissiere, C. De Lotto, B. De Min, A. Dijkstra, H. Di Ciaccio, L. Djama, F. Dolbeau, J. Donszelmann, M. Doroba, K. Dracos, M. Drees, J. Dris, M. Dufour, Y. Dupont, F. Eek, L.-O. Eerola, P.A.-M. Ehret, R. Ekelof, T. Ekspong, G. Elliot Peisert, A. Engel, J.-P. Ershaidat, N. Fassouliotis, D. Feindt, M. Fernandez Alonso, M. Ferrer, A. Filippas, T.A. Firestone, A. Foeth, H. Fokitis, E. Fontanelli, F. Forbes, K.A.J. Fousset, J.-L. Francon, S. Franek, B. Frenkiel, P. Fries, D.C. Frodesen, A.G. Fruhwirth, R. Fulda-Quenzer, F. Furnival, K. Furstenau, H. Fuster, J. Gamba, D. Garcia, C. Garcia, J. Gaspar, C. Gasparini, U. Gavillet, Ph. Gazis, E.N. Gerber, J.-P. Giacomelli, P. Gokieli, R. Golob, B. Golovatyuk, V.M. Gomez Y Cadenas, J.J. Goobar, A. Gopal, G. Gorski, M. Gracco, V. Grant, A. Grard, F. Graziani, E. Grosdidier, G. Gross, E. Grosse-Wiesmann, P. Grossetete, B. Guy, J. Haedinger, U. Hahn, F. Hahn, M. Haider, S. Hajduk, Z. Hakansson, A. Hallgren, A. Hamacher, K. Hamel De Monchenault, G. Hao, W. Harris, F.J. Hedberg, V. Henkes, T. Hernandez, J.J. Herquet, P. Herr, H. Hessing, T.L. Hietanen, I. Higgins, C.O. Higon, E. Hilke, H.J. Hodgson, S.D. Hofmokl, T. Holmes, R. Holmgren, S.-O. Holthuizen, D. Honore, P.F. Hooper, J.E. Houlden, M. Hrubec, J. Huet, K. Hulth, P.O. Hultqvist, K. Ioannou, P. Iversen, P.-S. Jackson, J.N. Jalocha, P. Jarlskog, G. Jarry, P. Jean-Marie, B. Johansson, E.K. Johnson, D. Jonker, M. Jonsson, L. Juillot, P. Kalkanis, G. Kalmus, G. Kapusta, F. Karlsson, M. Karvelas, E. Katsanevas, S. Katsoufis, E.C. Keranen, R. Kesteman, J. Khomenko, B.A. Khovanski, N.N. King, B. Kjaer, N.J. Klein, H. Klovning, A. Kluit, P. Koch-Mehrin, A. Koehne, J.H. Koene, B. Kokkinias, P. Koratzinos, M. Korcyl, H. Korytov, A.V. Kostioukhine, V. Kourkoumelis, C. Kouznetsov, O. Kramer, P.H. Krolikowski, J. Kronkvist, I. Kruener-Marquis, U. Kucewicz, W. Kulka, K. Kurvinen, K. Lacasta, C. Lambropoulos, C. Lamsa, J.W. Lanceri, L. Lapin, V. Laugier, J.-P. Lauhakangas, R. Leder, G. Ledroit, F. Leitner, R. Lemoigne, Y. Lemonne, J. Lenzen, G. Lepeltier, V. Lesiak, T. Levy, J.M. Lieb, E. Liko, D. Lindgren, J. Lindner, R. Lipniacka, A. Lippi, I. Loerstad, B. Lokajicek, M. Loken, J.G. Lopez-Fernandez, A. Lopez Aguera, M.A. Los, M. Loukas, D. Lozano, J.J. Lutz, P. Lyons, L. Maehlum, G. Maillard, J. Maio, A. Maltezos, A. Mandl, F. Marco, J. Margoni, M. Marin, J.-C. Markou, A. Maron, T. Marti, S. Mathis, L. Matorras, F. Matteuzzi, C. Matthiae, G. Mazzucato, M. Mc Cubbin, M. Mc Kay, R. Mc Nulty, R. Meola, G. Meroni, C. Meyer, W.T. Michelotto, M. Mikulec, I. Mirabito, L. Mitaroff, W.A. Mitselmakher, G.V. Mjoernmark, U. Moa, T. Moeller, R. Moenig, K. Monge, M.R. Morettini, P. Mueller, H. Murray, W.J. Myatt, G. Navarria, F.L. Negri, P. Nicolaidou, R. Nielsen, B.S. Nijjhar, B. Nikolaenko, V. Nilsen, P.E.S. Niss, P. Nomerotski, A. Obraztsov, V. Olshevski, A.G. Orava, R. Ostankov, A. Osterberg, K. Ouraou, A. Paganoni, M. Pain, R. Palka, H. Papadopoulou, T. Pape, L. Parodi, F. Passeri, A. Pegoraro, M. Pennanen, J. Peralta, L. Perevozchikov, V. Pernegger, H. Pernicka, M. Perrotta, A. Petridou, C. Petrolini, A. Pierre, F. Pimenta, M. Pingot, O. Plaszczynski, S. Podobrin, O. Pol, M.E. Polok, G. Poropat, P. Privitera, P. Pullia, A. Radojicic, D. Ragazzi, S. Rahmani, H. Ratoff, P.N. Read, A.L. Rebecchi, P. Redaelli, N.G. Regler, M. Reid, D. Renton, P.B. Resvanis, L.K. Richard, F. Richardson, M. Ridky, J. Rinaudo, G. Roditi, I. Romero, A. Roncagliolo, I. Ronchese, P. Ronnqvist, C. Rosenberg, E.I. Rossi, S. Rosso, E. Roudeau, P. Rovelli, T. Ruckstuhl, W. Ruhlmann-Kleider, V. Ruiz, A. Saarikko, H. Sacquin, Y. Sajot, G. Salt, J. Sanchez, J. Sannino, M. Schael, S. Schneider, H. Schulze, B. Schyns, M.A.E. Sciolla, G. Scuri, F. Segar, A.M. Seitz, A. Sekulin, R. Sessa, M. Sette, G. Seufert, R. Shellard, R.C. Siccama, I. Siegrist, P. Simonetti, S. Simonetto, F. Sisakian, A.N. Skjevling, G. Smadja, G. Smirnov, N. Smith, G.R. Sosnowski, R. Souza-Santos, D. Spassoff, T.S. Spiriti, E. Squarcia, S. Staeck, H. Stanescu, C. Stapnes, S. Stavropoulos, G. Stichelbaut, F. Stocchi, A. Strauss, J. Straver, J. Strub, R. Stugu, B. Szczekowski, M. Szeptycka, M. Szymanski, P. Tabarelli, T. Tchikilev, O. Theodosiou, G.E. Tilquin, A. Timmermans, J. Timofeev, V.G. Tkatchev, L.G. Todorov, T. Toet, D.Z. Toker, O. Tome, B. Torassa, E. Tortora, L. Treille, D. Trevisian, U. Trischuk, W. Tristram, G. Troncon, C. Tsirou, A. Tsyganov, E.N. Turluer, M.-L. Tuuva, T. Tyapkin, I.A. Tyndel, M. Tzamarias, S. Ueberschaer, S. Ullaland, O. Uvarov, V. Valenti, G. Vallazza, E. Valls Ferrer, J.A. Vander Velde, C. Van Apeldoorn, G.W. Van Dam, P. Van Der Heijden, M. Van Doninck, W.K. Vaz, P. Vegni, G. Ventura, L. Venus, W. Verbeure, F. Verlato, M. Vertogradov, L.S. Vilanova, D. Vincent, P. Vitale, L. Vlasov, E. Vodopyanov, A.S. Vollmer, M. Voutilainen, M. Vrba, V. Wahlen, H. Walck, C. Waldner, F. Wayne, M. Wehr, A. Weierstall, M. Weilhammer, P. Werner, J. Wetherell, A.M. Wickens, J.H. Wilkinson, G.R. Williams, W.S.C. Winter, M. Witek, M. Wormser, G. Woschnagg, K. Yamdagni, N. Yepes, P. Zaitsev, A. Zalewska, A. Zalewski, P. Zavrtanik, D. Zevgolatakos, E. Zhang, G. Zimin, N.I. Zito, M. Zuberi, R. Zukanovich Funchal, R. Zumerle, G. Zuniga, J.
Subjects: High Energy Physics::Experiment
Abstract: A new measurement of αs is obtained from the distributions in thrust, heavy jet mass, energy-energy correlation and two recently introduced jet broadening variables following a method proposed by Catani, Trentadue, Turnock and Webber. This method includes the full calculation of O(s2) terms and leading and next-to-leading logarithms resummed to all orders of αs. The analysis is based on data taken with the DELPHI detector at LEP during 1991. I its found that the inclusion of the resummed leading and next-to-leading logarithms reduces the scale dependence of αs and allows an extension of the fit range towards the infrared limit of the kinematical range. The combined value for αs obtained at the scale μ2=MZ2 is: Mathematical expression © 1993 Springer-Verlag.
Published: 1993

45. A measurement of B meson production and lifetime using Dl- events in Z0 decays

Author: Abreu, P. Adam, W. Adye, T. Agasi, E. Alekseev, G.D. Algeri, A. Allen, P. Almehed, S. Alvsvaag, S.J. Amaldi, U. Anassontzis, E.G. Andreazza, A. Antilogus, P. Apel, W.-D. Apsimon, R.J. Åsman, B. Augustin, J.-E. Augustinus, A. Baillon, P. Bambade, P. Barao, F. Barate, R. Barbiellini, G. Bardin, D.Y. Barker, G.J. Baroncelli, A. Barring, O. Barrio, J.A. Bartl, W. Bates, M.J. Battaglia, M. Baubillier, M. Becks, K.-H. Beeston, C.J. Begalli, M. Beilliere, P. Belokopytov, Yu. Beltran, P. Benedic, D. Benvenuti, A.C. Berggren, M. Bertrand, D. Bianchi, F. Bilenky, M.S. Billoir, P. Bjarne, J. Bloch, D. Blyth, S. Bocci, V. Bogolubov, P.N. Bolognese, T. Bonesini, M. Bonivento, W. Booth, P.S.L. Borgeaud, P. Borisov, G. Borner, H. Bosio, C. Bostjancic, B. Bosworth, S. Botner, O. Bouquet, B. Bourdarios, C. Bowcock, T.J.V. Bozzo, M. Braibant, S. Branchini, P. Brand, K.D. Brenner, R.A. Briand, H. Bricman, C. Brown, R.C.A. Brummer, N. Brunet, J.-M. Bugge, L. Buran, T. Burmeister, H. Buytaert, J.A.M.A. Caccia, M. Calvi, M. Camacho Rozas, A.J. Campion, R. Camporesi, T. Canale, V. Cao, F. Carena, F. Carroll, L. Caso, C. Castillo Gimenez, M.V. Cattai, A. Cavallo, F.R. Cerrito, L. Chabaud, V. Chan, A. Charpentier, Ph. Chaussard, L. Chauveau, J. Checchia, P. Chelkov, G.A. Chevalier, L. Chliapnikov, P. Chorowicz, V. Chrin, J.T.M. Clara, M.P. Collins, P. Contreras, J.L. Contri, R. Cortina, E. Cosme, G. Couchot, F. Crawley, H.B. Crennell, D. Crosetti, G. Crozon, M. Maestro, J.C. Czellar, S. Dahl-Jensen, E. Dalmagne, B. Dam, M. Damgaard, G. Darbo, G. Daubie, E. Daum, A. Dauncey, P.D. Davenport, M. David, P. Davies, J. Da Silva, W. Defoix, C. Delikaris, D. Delorme, S. Delpierre, P. Demaria, N. De Angelis, A. De Beer, M. De Boeck, H. De Boer, W. De Clercq, C. De Fez Laso, M.D.M. De Groot, N. De La Vaissiere, C. De Lotto, B. De Min, A. Dijkstra, H. Di Ciaccio, L. Djama, F. Dolbeau, J. Donszelmann, M. Doroba, K. Dracos, M. Drees, J. Dris, M. Dufour, Y. Eek, L.-O. Eerola, P.A.-M. Ehret, R. Ekelof, T. Ekspong, G. Elliot Peisert, A. Engel, J.-P. Ershaidat, N. Fassouliotis, D. Feindt, M. Fernandez Alonso, M. Ferrer, A. Filippas, T.A. Firestone, A. Foeth, H. Fokitis, E. Fontanelli, F. Forbes, K.A.J. Fousset, J.-L. Francon, S. Franek, B. Frenkiel, P. Fries, D.C. Frodesen, A.G. Fruhwirth, R. Fulda-Quenzer, F. Furnival, K. Furstenau, H. Fuster, J. Galeazzi, G. Gamba, D. Garcia, C. Garcia, J. Gaspar, C. Gasparini, U. Gavillet, Ph. Gazis, E.N. Gerber, J.-P. Giacomelli, P. Gokieli, R. Golob, B. Golovatyuk, V.M. Gomez Y Cadenas, J.J. Goobar, A. Gopal, G. Gorski, M. Gracco, V. Grant, A. Grard, F. Graziani, E. Grosdidier, G. Gross, E. Grosse-Wiesmann, P. Grossetete, B. Gumenyuk, S. Guy, J. Haedinger, U. Hahn, F. Hahn, M. Haider, S. Hakansson, A. Hallgren, A. Hamacher, K. Hamel De Monchenault, G. Hao, W. Harris, F.J. Henkes, T. Hernandez, J.J. Herquet, P. Herr, H. Hessing, T.L. Hietanen, I. Higgins, C.O. Higon, E. Hilke, H.J. Hodgson, S.D. Hofmokl, T. Holmes, R. Holmgren, S.-O. Holthuizen, D. Honore, P.F. Hooper, J.E. Houlden, M. Hrubec, J. Huet, K. Hulth, P.O. Hultqvist, K. Ioannou, P. Isenhower, D. Iversen, P.-S. Jackson, J.N. Jalocha, P. Jarlskog, G. Jarry, P. Jean-Marie, B. Johansson, E.K. Johnson, D. Jonker, M. Jonsson, L. Juillot, P. Kalkanis, G. Kalmus, G. Kapusta, F. Karlsson, M. Karvelas, E. Katsanevas, S. Katsoufis, E.C. Keranen, R. Kesteman, J. Khomenko, B.A. Khovanski, N.N. King, B. Kjaer, N.J. Klein, H. Klempt, W. Klovning, A. Kluit, P. Koch-Mehrin, A. Koehne, J.H. Koene, B. Kokkinias, P. Kopf, M. Korcyl, K. Korytov, A.V. Kostioukhine, V. Kourkoumelis, C. Kouznetsov, O. Kramer, P.H. Krolikowski, J. Kronkvist, I. Kruener-Marquis, U. Krupinski, W. Kulka, K. Kurvinen, K. Lacasta, C. Lambropoulos, C. Lamsa, J.W. Lanceri, L. Lapin, V. Laugier, J.-P. Lauhakangas, R. Leder, G. Ledroit, F. Leitner, R. Lemoigne, Y. Lemonne, J. Lenzen, G. Lepeltier, V. Lesiak, T. Levy, J.M. Lieb, E. Liko, D. Lindgren, J. Lindner, R. Lipniacka, A. Lippi, I. Loerstad, B. Lokajicek, M. Loken, J.G. Lopez-Fernandez, A. Lopez Aguera, M.A. Los, M. Loukas, D. Lozano, J.J. Lutz, P. Lyons, L. Maehlum, G. Maillard, J. Maltezos, A. Mandl, F. Marco, J. Margoni, M. Marin, J.-C. Markou, A. Maron, T. Marti, S. Mathis, L. Matorras, F. Matteuzzi, C. Matthiae, G. Mazzucato, M. McCubbin, M. McKay, R. McNulty, R. Meola, G. Meroni, C. Meyer, W.T. Michelotto, M. Mikulec, I. Mirabito, L. Mitaroff, W.A. Mitselmakher, G.V. Mjoernmark, U. Moa, T. Moeller, R. Moenig, K. Monge, M.R. Morettini, P. Mueller, H. Murray, W.J. Muryn, B. Myatt, G. Navarria, F.L. Negri, P. Nielsen, B.S. Nijjhar, B. Nikolaenko, V. Nilsen, P.E.S. Niss, P. Obraztsov, V. Olshevski, A.G. Orava, R. Ostankov, A. Osterberg, K. Ouraou, A. Paganoni, M. Pain, R. Palka, H. Papadopoulou, Th.D. Pape, L. Passeri, A. Pegoraro, M. Pennanen, J. Perevozchikov, V. Pernicka, M. Perrotta, A. Petridou, C. Petrolini, A. Petrovykh, L. Pettersen, T.E. Pierre, F. Pimenta, M. Pingot, O. Plaszczynski, S. Pol, M.E. Polok, G. Poropat, P. Privitera, P. Pullia, A. Radojicic, D. Ragazzi, S. Rahmani, H. Ratoff, P.N. Read, A.L. Redaelli, N.G. Regler, M. Reid, D. Renton, P.B. Resvanis, L.K. Richard, F. Richardson, M. Ridky, J. Rinaudo, G. Roditi, I. Romero, A. Roncagliolo, I. Ronchese, P. Ronnqvist, C. Rosenberg, E.I. Rossi, S. Rossi, U. Rosso, E. Roudeau, P. Rovelli, T. Ruckstuhl, W. Ruhlmann-Kleider, V. Ruiz, A. Rybicki, K. Saarikko, H. Sacquin, Y. Sajot, G. Salt, J. Sanchez, J. Sannino, M. Schael, S. Schneider, H. Schulze, B. Schyns, M.A.E. Sciolla, G. Scuri, F. Segar, A.M. Sekulin, R. Sessa, M. Sette, G. Seufert, R. Shellard, R.C. Siccama, I. Siegrist, P. Simonetti, S. Simonetto, F. Sisakian, A.N. Skaali, T.B. Skjevling, G. Smadja, G. Smith, G.R. Sosnowski, R. Spassoff, T.S. Spiriti, E. Squarcia, S. Staeck, H. Stanescu, C. Stapnes, S. Stavropoulos, G. Stichelbaut, F. Stocchi, A. Strauss, J. Straver, J. Strub, R. Szczekowski, M. Szeptycka, M. Szymanski, P. Tabarelli, T. Tavernier, S. Tchikilev, O. Theodosiou, G.E. Tilquin, A. Timmermans, J. Timofeev, V.G. Tkatchev, L.G. Todorov, T. Toet, D.Z. Toker, O. Torassa, E. Tortora, L. Treille, D. Trevisan, U. Trischuk, W. Tristram, G. Troncon, C. Tsirou, A. Tsyganov, E.N. Turala, M. Turluer, M.-L. Tuuva, T. Tyapkin, I.A. Tyndel, M. Tzamarias, S. Ueberschaer, S. Ullaland, O. Uvarov, V. Valenti, G. Vallazza, E. Valls Ferrer, J.A. Vander Velde, C. Van Apeldoorn, G.W. Van Dam, P. Van Der Heijden, M. Van Doninck, W.K. Vaz, P. Vegni, G. Ventura, L. Venus, W. Verbeure, F. Vertogradov, L.S. Vilanova, D. Vincent, P. Vitale, L. Vlasov, E. Vodopyanov, A.S. Vollmer, M. Voulgaris, G. Voutilainen, M. Vrba, V. Wahlen, H. Walck, C. Waldner, F. Wayne, M. Wehr, A. Weierstall, M. Weilhammer, P. Werner, J. Wetherell, A.M. Wickens, J.H. Wikne, J. Wilkinson, G.R. Williams, W.S.C. Winter, M. Witek, M. Wormald, D. Wormser, G. Woschnagg, K. Yamdagni, N. Yepes, P. Zaitsev, A. Zalewska, A. Zalewski, P. Zavrtanik, D. Zevgolatakos, E. Zhang, G. Zimin, N.I. Zito, M. Zuberi, R. Zukanovich Funchal, R. Zumerle, G. Zuniga, J.
Subjects: High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract: A study of B meson decays into DlX final states is presented. In these events, neutral and charged D mesons originate predominantly from B+ and B0 decays, respectively. The dilution of this correlation due to D** production has been taken into account. From 263 700 hadronic Z0 decays collected in 1991 with the DELPHI detector at the LEP collider, 92 D0→K-π+, 35 D+→K-π+π+ and 61 D*0→D0π+ followed by D0→K-π+ or D0→K-π+π+π -, are found with an associated lepton of the same charge as the kaon. From the D0l- and D*+l-, the probability fd that a b quark hadronizes into a B- (or {Mathematical expression}) meson is found to be 0.44 ±0.08±0.09, corresponding to a total (Bs+Λb) hadronization fraction of 0.12-0.12+0.24. By reconstructing the energy of each B meson, the b quark fragmentation is directly measured for the first time. The mean value of the B meson energy fraction is: {Mathematical expression} Reconstructing D-lepton vertices, the following B lifetimes are measured: {Mathematical expression} and an average τ(B)=1.23-0.13+0.14(stat.)±0.15(syst.) ps is found. Allowing for decays into {Mathematical expression}, the B+ and B0 lifetimes are: {Mathematical expression} © 1993 Springer-Verlag.
Published: 1993

46. DETERMINATION OF ALPHA(S) FOR B-QUARKS AT THE Z(0) RESONANCE

Author: ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R and ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ and AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD and APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R and BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A and BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M and BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M and BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D and BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F and BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S and BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M and BONIVENTO, W BOOTH, PSL BORISOV, G BORNER, H BOSIO, C and BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B and BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S and BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C and BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T and BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M and ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CAO, F and CARENA, F CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A and CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P and CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA and CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM and COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G and COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G and CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DAUBIE, E DAUM, A DAUNCEY, PD and DAVENPORT, M DAVID, P DAVIES, J DASILVA, W DEFOIX, C and DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H and DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N and DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H and DICIACCIO, L DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EDSALL, D and EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G and PEISERT, AE ENGEL, JP ERSHAIDAT, N FASSOULIOTIS, D and FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A and FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ and FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC and FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K and FURSTENAU, H FUSTER, J GAMBA, D GARCIA, C GARCIA, J and GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B GOLOVATYUK, VM and CADENAS, JJGY GOPAL, G GORSKI, M GRACCO, V GRANT, A and GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E and GROSSEWIESMANN, P GROSSETETE, B GUMENYUK, S GUY, J and HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAKANSSON, A and HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENKES, T HERNANDEZ, JJ HERQUET, P and HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E and HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO and HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M and HRUBEC, J HUET, K HULTH, PO HULTQVIST, K IOANNOU, P and IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P and JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M and JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F and KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC and KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLOVNING, A KLUIT, P and KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P and KORATZINOS, M KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C and KOUZNETSOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I and KRUENERMARQUIS, U KRUPINSKI, W KULKA, K KURVINEN, K and LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V and LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F and LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V and LESIAK, T LEVY, JM LIEB, E LIKO, D LINDGREN, J and LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M and LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G and MAILLARD, J MAIO, A MALTEZOS, A MANDL, F MARCO, J and MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S and MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G and MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G and MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I and MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U and MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P and MUELLER, H MURRAY, WJ MURYN, B MYATT, G NAVARRIA, FL and NEGRI, P NICOLAIDOU, R NIELSEN, BS NIJJHAR, B and NIKOLAENKO, V NILSEN, PES NISS, P NOMEROTSKI, A and OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A and OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H and PAPADOPOULOU, TD PAPE, L PARODI, F PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L PERNEGGER, H PERNICKA, M and PERROTTA, A PETRIDOU, C PETROLINI, A PETROVYKH, O and PIERRE, F PIMENTA, M PINGOT, O PLASZCZYNSKI, S PODOBRIN, O POL, ME POLOK, G POROPAT, P POZDNIAKOV, V and PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REBECCHI, P REDAELLI, NG and REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F and RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A and RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI and ROSSI, S ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W and RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H and SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M and SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F and SEGAR, AM SEITZ, A SEKULIN, R SESSA, M SETTE, G and SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P and SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G and SMADJA, G SMIRNOV, N SMIRNOVA, O SMITH, GR SOSNOWSKI, R and SOUZASANTOS, D SPASSOFF, TS SPIRITI, E SQUARCIA, S and STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G and STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R and STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P and TABARELLI, T TCHIKILEV, O THEODOSIOU, GE TILQUIN, A and TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOME, B TORASSA, E TORTORA, L TREILLE, D and TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C and TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T and TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S and ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV and VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W and VERBEURE, F VERLATO, M VERTOGRADOV, LS VILANOVA, D and VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M and VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F and WAYNE, M WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WILKINSON, GR WILLIAMS, WSC and WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P and ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M and ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J
Subjects: High Energy Physics::Lattice, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract: The strong coupling constant for b quarks has been determined, and its flavour independence, as predicted by QCD, investigated. The analysis involved events with lepton candidates selected from approximately 356 000 hadronic decays of the Z0, collected by the DELPHI detector at LEP in 1990 and 199 1. A method based on a direct comparison of the three-jet fraction in a b enriched sample, selected by requiring leptons with large momenta and transverse momenta, to that of the entire hadronic sample, illustrated the significant effect of the b quark mass on the multi-jet cross section, and verified the flavour independence of the strong coupling constant to an accuracy of +/- 6%. A second procedure based on a fit to the momentum and transverse momentum spectra of the lepton candidates in both two-jet and three (or more)-jet event samples simultaneously determined the b content in each, and, using second order QCD calculations, gave an absolute measurement of alpha(s) for b quarks of 0. 1 18 +/- 0.004 (stat.) +/- 0.003 (syst.) +/- 0.008 (scale). A comparison with a, for all quark flavours, as measured from the three-jet fraction in all hadronic events, further allowed the coupling strength for b quarks to be expressed in terms relative to that for udsc quarks, thereby cancelling certain common systematic uncertainties, and yielded alpha(s)b/alpha(s)udsc = 1.00 +/- 0.04 (stat.) +/- 0.03 (syst.).
Published: 1993

47. SEARCH FOR Z(0) DECAYS TO 2 LEPTONS AND A CHARGED-PARTICLE ANTIPARTICLE PAIR

Author: ABREU, P ADAM, W ADYE, T AGASI, E ALEKSAN, R and ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ and AMALDI, U ANDREAZZA, A ANTILOGUS, P APEL, WD and APSIMON, RJ ARNOUD, Y ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R and BARBIELLINI, G BARDIN, DY BARKER, GJ BARONCELLI, A and BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M and BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M and BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D and BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F and BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S and BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M and BONIVENTO, W BOOTH, PSL BORISOV, G BORNER, H BOSIO, C and BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUDINOV, E and BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H and BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L and BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M and ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CAO, F and CARENA, F CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A and CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A and CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P and CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V and CHRIN, JTM COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E and COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D and CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E and DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DAVIES, J and DASILVA, W DEFOIX, C DELPIERRE, P DEMARIA, N and DEANGELIS, A DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD and DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A and DIJKSTRA, H DICIACCIO, L DOLBEAU, J DONSZELMANN, M and DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y and DUPONT, F EDSALL, D EEK, LO EEROLA, PAM EHRET, R and EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP ERSHAIDAT, N and FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A and FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E and FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R and FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J and GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U and GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B GOLOVATYUK, VM GOMEZ, JJ CADENAS, Y and GOPAL, G GORN, L GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E GROSSEWIESMANN, P and GROSSETETE, B GUMENYUK, S GUY, J HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAKANSSON, A HALLGREN, A and HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HEDBERG, V HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H and HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ and HODGSON, SD HOFMOKL, T HOLMGREN, SO HOLTHUIZEN, D and HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HUET, K and HULTH, PO HULTQVIST, K IOANNOU, P IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B and JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P and KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M and KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R and KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ and KLEIN, H KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KORATZINOS, M KORYTOV, AV and KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH and KREUTER, C KROLIKOWSKI, J KRONKVIST, I KRUENERMARQUIS, U and KRUPINSKI, W KULKA, K KURVINEN, K LACASTA, C and LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R and LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T and LEVY, JM LIEB, E LIKO, D LINDGREN, J LINDNER, R and LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG and LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D and LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J and MAIO, A MALTEZOS, A MANDL, F MARCO, J MARGONI, M and MARIN, JC MARKOU, A MARON, T MARTI, S MATORRAS, F and MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT and MICHELOTTO, M MIKULEC, I MIRABITO, L MITAROFF, WA and MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ and MURYN, B MYATT, G NAVARRIA, FL NEGRI, P NICOLAIDOU, R and NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES and NISS, P NOMEROTSKI, A OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M and PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PARODI, F and PASSERI, A PEGORARO, M PENNANEN, J PERALTA, L and PEREVOZCHIKOV, V PERNEGGER, H PERNICKA, M PERROTTA, A and PETRIDOU, C PETROLINI, A PETROVICH, L PIERRE, F PIMENTA, M PINGOT, O PLASZCZYNSKI, S PODOBRIN, O POL, ME and POLOK, G POROPAT, P POZDNIAKOV, V PRIVITERA, P PULLIA, A and RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REBECCHI, P REDAELLI, NG REGLER, M REID, D and RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I and RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSO, E and ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V and RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G and SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H and SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEITZ, A and SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC and SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F and SISAKIAN, AN SKJEVLING, G SMADJA, G SMIRNOVA, O SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOFF, TS SPIRITI, E and SQUARCIA, S STAECK, H STANESCU, C STAPNES, S and STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J and STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M and SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE and TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG and TODOROV, T TOET, DZ TOKER, O TOME, B TORASSA, E and TORTORA, L TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M and TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S and UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G and VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW and VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERLATO, M and VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOUTILAINEN, M VRBA, V and WAHLEN, H WALCK, C WALDNER, F WEHR, A WEIERSTALL, M and WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH and WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A and ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E and ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ and ZUMERLE, G ZUNIGA, J
Subjects: High Energy Physics::Experiment, Computer Science::Information Theory
Abstract: Based on a sample equivalent to 365000 hadronic Z0 decays, the search in DELPHI data for pairs of leptons accompanied by a pair of charged particles is described. A total of 11 events were found in the electron channel, 9 in the muon channel and 7 in the tau channel. Results on lepton pairs with a radiated photon are also presented. The data from all channels are compatible with the expectations from standard processes. However, one event was found in the tau channel with an unusually high mass of the charged particle pair.
Published: 1993

48. A MEASUREMENT OF SIN2-THETA-W FROM THE CHARGE ASYMMETRY OF HADRONIC EVENTS AT THE Z0 PEAK

Author: ABREU, P ADAM, W ADAMI, F ADYE, T AKESSON, T and ALEKSEEV, GD ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U and ANASSONTZIS, E ANTILOGUS, P APEL, WD APSIMON, RJ and ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY and BARONCELLI, A BARRING, O BARTL, W BATES, MJ BATTAGLIA, M and BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M and BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D and BENLLOCH, JM BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V and BOGOLUBOV, PN BOLOGNESE, T BONAPART, M BONESINI, M and BONIVENTO, W BOOTH, PSL BORGEAUD, P BORISOV, G BORNER, H and BOSIO, C BOSTJANCIC, B BOTNER, O BOUQUET, B and BOURDARIOS, C BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA and BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H and BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC and CAMPION, A CAMPORESI, T CANALE, V CAO, F CARENA, F and CARROLL, L CASO, C CASTELLI, E GIMENEZ, MVC CATTAI, A and CAVALLO, FR CERRITO, L CHAN, A CHARPENTIER, P and CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA and CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R COSME, G and COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M and MAESTRO, JC CZELLAR, S DAGORET, S DAHLJENSEN, E and DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E and DAUNCEY, PD DAVENPORT, M DAVID, P DASILVA, W DEFOIX, C and DELIKARIS, D DELORME, S DELPIERRE, P DEMARIA, N and DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C and LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B and DEMIN, A DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J and DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M and DUFOUR, Y DULINSKI, W EEK, LO EEROLA, PAM EKELOF, T and EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D and FEINDT, M FENYUK, A ALONSO, MF FERRER, A FILIPPAS, TA and FIRESTONE, A FOETH, H FOKITIS, E FOLEGATI, P and FONTANELLI, F FORBES, KAJ FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K and FURSTENAU, H FUSTER, J GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P and GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R and GOLOVATYUK, VM CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M GRACCO, V GRANT, A FRARD, F GRAZIANI, E and GROSDIDIER, G GROSS, E GROSSEWIESMANN, P GROSSETETE, B and GUMENYUK, S GUY, J HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH and HARRIS, FJ HECK, BW HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ and HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO and HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J and HULTH, PO HULTQVIST, K HUSSON, D IOANNOU, P and ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P and JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G and KALMUS, G KAPUSTA, F KARLSSON, M KATSANEVAS, S and KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA and KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W and KLOVNING, A KLUIT, P KOEHNE, JH KOENE, B KOKKINIAS, P and KOPF, M KORATZINOS, M KORCYL, K KORYTOV, AV and KOSTIUKHIN, V KOSTRIKOV, M KOURKOUMELIS, C KRAMER, PH and KREUZBERGER, T KROLIKOWSKI, J KRONKVIST, I KRSTIC, J and KRUENERMARQUIS, U KRUPINSKI, W KUCEWICZ, W KURVINEN, K and LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V and LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F and LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V and LETESSIERSELVON, A LIEB, E LIKO, D LILLETHUN, E and LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I LLOSA, R and LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A and AGUERA, MAL LOS, M LOUKAS, D LOUNIS, A LOZANO, JJ and LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MALTEZOS, A and MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A and MARON, T MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C and MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R and MENICHETTI, E MEOLA, G MERONI, C MEYER, WT and MICHELOTTO, M MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U and MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P and MUELLER, H MURRAY, WJ MURYN, B MYATT, G NARAGHI, F and NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B and NIKOLAENKO, V OBRAZTSOV, V OESTERBERG, K OLSHEVSKI, AG and ORAVA, R OSTANKOV, A OURAOU, A PAGANONI, M PAIN, R and PALKA, H PAPADOPOULOU, T PAPE, L PASSERI, A PEGORARO, M and PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A and PIERRE, F PIMENTA, M PINGOT, O POL, ME POLOK, G and POROPAT, P PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D and RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M and RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I and RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, U and ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V and RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G and SALT, J SANCHEZ, E SANCHEZ, J SANNINO, M SCHAEFFER, M SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SIEGRIST, P SIMONETTI, S SIMONETTO, F SISSAKIAN, AN and SKAALI, TB SKJEVLING, G SMADJA, G SMIRNOV, N SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S and STAECK, H STANESCU, C STAVROPOULOS, G STICHELBAUT, F and STOCCHI, A STRAUSS, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S THEODOSIOU, GE and TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG and TODOROV, T TOET, DZ TOKER, O TORASSA, E TORTORA, L and TRAINOR, MT TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M and TURCHETTA, R TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M and TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V and VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C and VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VARELA, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F and VERTOGRADOV, LS VILANOVA, D VITALE, L VLASOV, E and VLASSOPOULOS, S VODOPYANOV, AS VOLLMER, M VOLPONI, S and VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C and WALDNER, F WAYNE, M WEHR, A WEIERSTALL, M and WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D and WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A and ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E and ZHANG, G ZIMIN, NI ZITO, M ZITOUN, R FUNCHAL, RZ and ZUMERLE, G ZUNIGA, J
Subjects: High Energy Physics::Experiment
Abstract: The weak mixing angle has been measured from the charge asymmetry of hadronic events with two different approaches using the DELPHI detector at LEP. Both methods are based on a momentum-weighted charge sum to determine the jet charge in both event hemispheres. In a data sample of 247 300 multihadronic Z0 decays a charge asymmetry of [Q(F)] - [Q(B)] = -0.0076 +/- 0.0012(stat.) +/- O.0005(exp. syst.) +/- 0.0014(frag.) and a raw forward-backward asymmetry of A(FB)raw = 0.0109 +/- 0.0020(stat.) +/- 0.0010(exp.syst.) +/- 0.0017(frag.) have been measured. This result corresponds to a value of sin2-theta(eff) = 0.2345 +/- 0.0030(exp.) +/- 0.0027(frag.) +/- sin2-theta(MSBAR) = 0.2341 +/- 0.0030(exp.) +/- 0.0027(frag.) and to sin2-theta(w) = 1 -m(w)2/m(z)2 = 0.2299 +/- 0.0030(exp.) +/- 0.0027(frag.) +/- 0.0028 (theor.). The experimental error is the quadratic sum of the statistical and the experimental systematic error and the theoretical error originates from a value of m(t) = 130 +/- 40 GeV/c2 and a range of m(H) from 45 GeV/c2 to 100 GeV/c2.
Published: 1992

49. MEASURING OF THE Z(0)BRANCHING FRACTION TO B QUARK PARIS USING THE BOOSTED SPHERICITY PRODUCT

Author: ABREU, P ADAM, W ADAMI, F ADYE, T AKESSON, T and ALEKSEEV, GD ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U and ANASSONTZIS, EG ANTILOGUS, P APEL, WD APSIMON, RJ and ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY and BARONCELLI, A BARRING, O BARTL, W BATES, MJ BATTAGLIA, M and BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M and BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D and BENLLOCH, JM BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V and BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W and BOOTH, PSL BORGEAUD, P BORISOV, G BORNER, H BOSIO, C and BOSTJANCIC, B BOTNER, O BOUQUET, B BOURDARIOS, C and BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD and BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H and BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C and CASTELLI, E GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHAN, A CHAPKIN, M CHARPENTIER, P CHAUSSARD, L and CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L and CHLIAPNIKOV, P CHOROWICZ, V CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R COSME, G COUCHOT, F and CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAGORET, S DAHLJENSEN, E DALMAGNE, B and DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUNCEY, PD and DAVENPORT, M DAVID, P DASILVA, W DEFOIX, C DELIKARIS, D and DELORME, S DELPIERRE, P DEMARIA, N DEANGELIS, A and DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD and DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A and DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J and DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M and DUFOUR, Y EEK, LO EEROLA, PAM EKELOF, T EKSPONG, G and PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H and FOKITIS, E FOLEGATI, P FONTANELLI, F FORBES, KAJ FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R and FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J and GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPAR, C and GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP and GIACOMELLI, P GOKIELI, R GOLOVATYUK, VM CADENAS, JJGY and GOOBAR, A GOPAL, G GORSKI, M GRACCO, V GRANT, A and GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E and GROSSEWIESMANN, P GROSSETETE, B GUMENYUK, S GUY, J HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ and HECK, BW HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H and HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ and HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO and HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J and HULTH, PO HULTQVIST, K IOANNOU, P ISENHOWER, D and IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P and JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M and JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F and KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC and KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P and KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORATZINOS, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C and KRAMER, PH KREUZBERGER, T KROLIKOWSKI, J KRONKVIST, I and KRSTIC, J KRUENERMARQUIS, U KRUPINSKI, W KUCEWICZ, W and KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW and LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G and LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LETESSIERSELVON, A LIEB, E LIKO, D and LILLETHUN, E LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I LLOSA, R LOERSTAD, B LOKAJICEK, M LOKEN, JG and LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A and MARON, T MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C and MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R and MCNULTY, R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M and MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T and MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H and MURRAY, WJ MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL and NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V and OBRAZTSOV, V OESTERBERG, K OLSHEVSKI, AG ORAVA, R and OSTANKOV, A OURAOU, A PAGANONI, M PAIN, R PALKA, H and PAPADOPOULOU, T PAPE, L PASSERI, A PEGORARO, M PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PIERRE, F and PIMENTA, M PINGOT, O POL, ME POLOK, G POROPAT, P and PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J and RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, U ROSSO, E and ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANN, V RUIZ, A and RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J and SANCHEZ, E SANCHEZ, J SANNINO, M SCHAEL, S and SCHNEIDER, H SCHYNS, MAE SCURI, F SEGAR, AM SEKULIN, R and SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SIEGRIST, P SIMONETTI, S SIMONETTO, F SISSAKIAN, AN SKAALI, TB and SKJEVLING, G SMADJA, G SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C and STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J and STRAVER, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M and SZYMANSKI, P TABARELLI, T TAVERNIER, S TCHIKILEV, O and THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG and TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TORASSA, E and TORTORA, L TRAINOR, MT TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN and TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M and TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V and VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C and VANAPELDOORN, GW VANDAM, P VANDONINCK, WK VARELA, J VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F and VERTOGRADOV, LS VILANOVA, D VISHNEVSKY, N VITALE, L and VLASOV, E VLASSOPOULOS, S VODOPYANOV, AS VOLLMER, M and VOLPONI, S VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H and WALCK, C WALDNER, F WAYNE, M WEHR, A WEIERSTALL, M and WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH and WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P and ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D and ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZITOUN, R and FUNCHAL, RZ ZUMERLE, G ZUNIGA, J
Subjects: High Energy Physics::Experiment, Nuclear Experiment
Abstract: From a sample of about 120 000 hadronic Z0 decays, using a technique based on a separation of the different event categories in the boosted sphericity product, the fraction of bbBAR decays has been measured to be 0.219 +/- 0.014 (stat) +/- 0.019 (syst). Using the DELPHI determination of the hadronic Z0 width, this corresponds to a partial width GAMMA(bbBAR) = 378 +/- 42 MeV (in good agreement with the standard model prediction of congruent-to 380 N eV). Combining this measurement with the determinations based on events with high p(t) leptons gives an estimate for the branching ratio of b into leptons at LEP of (11.2 +/- 1.2)%, consistent with previous determinations.
Published: 1992

50. EVIDENCE FOR B(S)(0) MESON PRODUCTION IN Z(0) DECAYS

Author: ABREU, P ADAM, W ADYE, T AGASI, E ALEKSEEV, GD and ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U and ANASSONTZIS, EG ANDREAZZA, A ANTILOGUS, P APEL, WD and APSIMON, RJ ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G and BARDIN, DY BARONCELLI, A BARRING, O BARRIO, JA BARTL, W and BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH and BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y and BELOUS, K BELTRAN, P BENEDIC, D BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P and BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN and BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL and BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B and BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C and BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD and BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H and BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C and GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V and CHAN, A CHAPKIN, M CHARPENTIER, P CHAUSSARD, L and CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L and CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CIRIO, R CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E and COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G and CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E and DALMANGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E and DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DASILVA, W and DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P DEMARIA, N DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W and DECLERCQ, C DELASO, MDM DEGROOT, N DELAVAISSIERE, C and DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DJAMA, F and DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DZHELYADIN, R EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEINDT, M FENYUK, A ALONSO, MF and FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E and FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S and FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J and GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPAR, C and GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP and GIACOMELLI, P GOKIELI, R GOLOB, B GOLOVATYUK, VM and CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M GRACCO, V and GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E and GROSSEWIESMANN, P GROSSETETE, B GUMENYUK, S GUY, J and HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAJDUK, Z and HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH and HAO, W HARRIS, FJ HENKES, T HERNANDEZ, JJ HERQUET, P and HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E and HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO and HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M and HRUBEC, J HUET, C HULTH, PO HULTQVIST, K IOANNOU, P and ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P and JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G and KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATARGIN, A and KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J and KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H and KLEMPT, W KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I KRSTIC, J KRUENERMARQUIS, U KRUPINSKI, W KULKA, K KURVINEN, K LACASTA, C and LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R and LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LEVY, JM and LIEB, E LIKO, D LILLETHUN, E LINDGREN, J LINDNER, R and LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M and LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D and LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J and MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC and MARKOU, A MARON, T MARTI, S MATHIS, L MATORRAS, F and MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M and MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT and MICHELOTTO, M MIKULEC, I MIRABITO, L MITAROFF, WA and MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ and MURYN, B MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P and NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P and OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A and OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H and PAPADOPOULOU, TD PAPE, L PASSERI, A PEGORARO, M and PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A and PETRIDOU, C PETROLINI, A PETTERSEN, TE PIERRE, F and PIMENTA, M PINGOT, O POL, ME POLOK, G POROPAT, P and PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D and RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M and RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I and RONCHESE, P RONJIN, V RONNQVIST, C ROSENBERG, EI and ROSSI, S ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T and RUCKSTUHL, W RUHLMANN, V RUIZ, A RYBICKI, K SAARIKKO, H and SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M and SCHAEL, S SCHNEIDER, H SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R and SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S and SIMONETTO, F SISAKIAN, AN SKAALI, TB SKJEVLING, G and SMADJA, G SMIRNOV, N SMITH, GR SOSNOWSKI, R SPASSOFF, TS and SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C and STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A and STRAUSS, J STRAVER, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S TCHIKILEV, O and THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG and TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TOMARADZE, A and TORASSA, E TORTORA, L TRAINOR, MT TREILLE, D and TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A and TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O and UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV and VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDONINCK, WK and VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F and VERTOGRADOV, LS VILANOVA, D VINCENT, P VISHNEVSKY, N and VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEHR, A WEIERSTALL, M WEILHAMMER, P and WERNER, J WETHERELL, AM WICKENS, JH WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WORMALD, D WORMSER, G and WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A and ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G and ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G and ZUNIGA, J
Subjects: High Energy Physics::Phenomenology, Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Seven unambiguous events out of a sample of 270 000 Z0 decays, contain in tile same jet a D(s) meson and a muon at large transverse momentum relative to the et axis. These events are direct evidence for B(s)0 meson production in hadronic Z0 decays. The production rate of these events, relative to all hadronic Z0 decays is ( 18 +/- 8) x 10(-5) this number including the relevant branching fractions of the B(s)0 and D(s). The value of the B(s)0 meson lifetime relative to the average B meson lifetime is measured to be 0.8 +/- 0.4.
Published: 1992

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