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Languages : en
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The energy dependence of the relative production rate of 3-jet events is studied in hadronic ee− annihilation events at centre of mass energies between 22 and 56 GeV, using the data of the JADE, MARK-II and AMY collaborations at PETRA, PEP and TRISTAN. Three jet events are defined by a jet finding algorithm which is closely related to the definition of resolvable jets used in O(.cap alpha./sub s/2) perturbative QCD calculations, where the relative production rate of 3-jet events is roughly proportional to the strong coupling strength, .cap alpha./sub s/. The observed production rates of 3-jet events decreases significantly with increasing centre of mass energy. The results, which are independent of fragmentation model calculations, can be directly compared to theoretically calculated jet production rates and are in good agreement with the QCD expectations of a running coupling strength, while the hypothesis of an energy independent coupling constant can be excluded with a significance of 5 standard deviations. Based on these results, the presented jet analysis also provides the possibility to detect first signs of the production of new and heavy particles in the early stage of data taking at SLC and LEP.
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Languages : en
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Book Description
The energy dependence of the relative production rate of 3-jet events is studied in hadronic ee− annihilation events at centre of mass energies between 22 and 56 GeV, using the data of the JADE, MARK-II and AMY collaborations at PETRA, PEP and TRISTAN. Three jet events are defined by a jet finding algorithm which is closely related to the definition of resolvable jets used in O(.cap alpha./sub s/2) perturbative QCD calculations, where the relative production rate of 3-jet events is roughly proportional to the strong coupling strength, .cap alpha./sub s/. The observed production rates of 3-jet events decreases significantly with increasing centre of mass energy. The results, which are independent of fragmentation model calculations, can be directly compared to theoretically calculated jet production rates and are in good agreement with the QCD expectations of a running coupling strength, while the hypothesis of an energy independent coupling constant can be excluded with a significance of 5 standard deviations. Based on these results, the presented jet analysis also provides the possibility to detect first signs of the production of new and heavy particles in the early stage of data taking at SLC and LEP.
Author: G. Kramer
Publisher: Springer
ISBN: 3540388214
Category : Science
Languages : en
Pages : 148
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Author: Stefan Pokorski
Publisher: World Scientific
ISBN: 9814569356
Category :
Languages : en
Pages : 546
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This volume contains reviews and new theoretical and experimental results on the following topics: testing the standard model, electroweak symmetry breaking and Higgs boson physics, rare decays, CP violation, oscillations, physics of strong interactions, physics beyond the standard model.
Author: Wolfgang Ochs
Publisher:
ISBN:
Category :
Languages : de
Pages : 13
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Author: Werner Ruhl
Publisher: Springer Science & Business Media
ISBN: 1468437224
Category : Science
Languages : en
Pages : 599
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The Advanced Study Institute on Field Theoretical Methods in Particle Physics was held at the Universitat Kaiserslautern in Kaiserslautern, Germany, from August 13 to August 24, 1979. Twenty invited lectures and seminar-speakers and 100 other participants attended this Institute. The contributions of most of the lecturers and seminar-speakers are contained in this volume. The revival of field theory in elementary particle physics that started about ten years ago has influenced all branches of elementary particle physics from fundamental research to pure phenomenology. The selection of field theoretical methods in part icle physics appropriate for the Institute is therefore the first task for the organizers. We decided to have constructive problems of gauge field theories and solvable models as two major areas to be covered during the Institute. If one considers the concepts and terminology currently used by pure field theorists, one notices that many of them were introduced and discussed first by pheno menologists in comparing quite elementary models directly with experimental data. For this reason, it seemed worthwhile to re serve considerable time to phenomenological field theory. The Institute was sponsored by the North Atlantic Treaty Organization whose funds made the Institute possible. It was co sponsored by the Bundes-Ministerium fur Forschung und Technologie in Bonn and the Landes-Ministerium fUr Kultus in Mainz. The City of Kaiserslautern made the Theodor Zink Museum avail able for a reception. Thanks are due in particular to its director, Dr. Dunkel.
Author: Thomas Ferbel
Publisher: Springer Science & Business Media
ISBN: 1468450182
Category : Science
Languages : en
Pages : 439
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Book Description
The third Advanced Study Institute (ASI) on Techniques and Concepts of High Energy Physics was held at the Hotel on the Cay, in the scenic harbor of Christiansted, St. Croix, U. S. Virgin Islands. Christiansted was the site of the first ASI, and it was certainly a delight to return there again. As in the previous ASI's, the aim was to bring together a small group of promising young experimenters and several outstanding senior scholars in experimental and theoretical high energy physics in order to learn about the latest developments in the field and to strengthen contacts among scientists from different countries and different backgrounds. The institute was both a great scientific and a great social success; much of this was due to the beautiful setting and to the dedication of the Hotel management of Ray Boudreau and Hurchell Greenaway and their excellent staff. The primary support for the meeting was once again provided by the Scientific Affairs Division of NATO. The ASI was cosponsored by the U. S. Department of Energy, by Fermilab, by the National Science Found ation, and by the University of Rochester. A special contribution from the Oliver S. and Jennie R. Donaldson Charitable Trust provided an important degree of flexibility, as well as support for worthy students from developing nations. As in the case of the previous ASI's, the scientific program was designed for advanced graduate students and recent PhD recipients in experimental particle physics.
Author: Junpei Fujimoto
Publisher:
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Category :
Languages : en
Pages :
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Author: J. Thanh Van Tran
Publisher: Atlantica Séguier Frontières
ISBN: 9782863320112
Category : Hadron spectroscopy
Languages : en
Pages : 472
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Book Description
![Determination of the Strong Coupling [alpha]s̳ from Jet Production Rates in Ee− Annihilation at TRISTAN Energies PDF](https://books.google.com/books/content/images/frontcover/8DbFHgAACAAJ?fife=w80-h100)
Author: YueKuan Li
Publisher:
ISBN:
Category :
Languages : en
Pages : 250
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Author: Asghar Qadir
Publisher: Springer Science & Business Media
ISBN: 1468441396
Category : Science
Languages : en
Pages : 629
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Book Description
These proceedings cover the lectures delivered at the Fifth International Summer College on Physics and Contemporary Needs from June 16-July 4, 1980 at Nathiagali, one of the scenic hill resorts in the northern part of Pakistan. The college was organized by the Pakistan Atomic Energy Commission (PAEC) and co-sponsored by the International Centre for Theroetical Physics (ICTP), Trieste, Italy. It also received a financial grant from the University Grants Commission (UGC) for the participation of physicists from various universities in Pakistan. The college was attended by 22 lecturers and invited seminar speakers, 150 participants from 30 countries, and consisted of 15 concentrated days of lectures, seminars and informal discussions. These proceedings contain only some of the regular lectures delivered at Nathiagali, but the seminars heldthere are listed in the Appendix. This year the main emphasis of the college was on the fron tiers of physics, particularly on the recent exciting development in high-energy physics and astrophysics. However, the lectures delivered at the college also covered a large sample of other aspects of physics ranging from low"-temperature physics to plasma physics of of fusion. The series of colleges of which the present college is the fifth, an attempt to remove the barrier of isolation for the physicists working in developing countries, far removed from active centres of research. It is hoped that these colleges are helping to fill the gap in communication between the physicists of developing and advanced countries.
