Global Jet Properties at 14-44 GeV Center of Mass Energy in E+e- Annihilation PDF Download
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Author: TASSO Collaboration
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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Author: TASSO Collaboration
Publisher:
ISBN:
Category :
Languages : en
Pages : 19
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Author: Deutsches Elektronen-Synchrotron (Hamburg).
Publisher:
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Category :
Languages : de
Pages :
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![Jet properties in e+e- annihilation [eeannihilation] at the center of mass energies between 14 and 44 GeV PDF](https://books.google.com/books/content/images/frontcover/9vjGPgAACAAJ?fife=w80-h100)
Author: Krzysztof Genser
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Category :
Languages : en
Pages :
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![Jet properties in e_1hn+e_1hn_346 annihilation [ee annihilation] at the center of mass energies between 14 and 44 GeV PDF](https://books.google.com/books/content/images/frontcover/2VspygAACAAJ?fife=w80-h100)
Author: Krzysztof Genser
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Category :
Languages : de
Pages :
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Category : Nuclear physics
Languages : en
Pages : 786
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Author:
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Category :
Languages : en
Pages :
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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.
![Jets in Ee− Annihilation. [Cross Section Ratio, 2. 6 to 7. 8 GeV, Review]. PDF](https://books.google.com/books/content/images/frontcover/rWW1AQAACAAJ?fife=w80-h100)
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Languages : en
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The latest results on R, the ratio of the total cross section for production of multihadronic events to the muon pair production cross section, and inclusive distributions of hadrons from ee− annihilation in the center-of-mass energy range from 2.6 to 7.8 GeV are presented. The evidence for jet structure is reviewed. Inclusive distributions of hadrons in Feynman x, rapidity, and transverse momentum relative to the jet direction are studied. Particular emphasis is placed on the method used to measure these inclusive distributions and the biases which might result from this method.
![Tests of Models for Parton Fragmentation in E E Annihilation. [29 GeV Center-of-mass Energy]. PDF](https://books.google.com/books/content/images/frontcover/imujAQAACAAJ?fife=w80-h100)
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Languages : en
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We examine the distribution of particles in the three jet events of e e annihilation. The data was collected with the PEP-4/Time Projection Chamber detector at 29 GeV center-of-mass energy at PEP. The experimental distributions are compared to the predictions of several fragmentation models which describe the transition of quarks and gluons into hadrons. In particular, our study emphasizes the three fragmentation models which are currently in widest use: the Lund string model, the Webber cluster model and the independent fragmentation model. These three models each possess different Lorentz frame structures for the distribution of hadron sources relative to the overall event c.m. in three jet events. The Lund string and independent fragmentation models are tuned to describe global event properties of our multihadronic annihilation event sample. This tuned Lund string model provides a good description of the distribution of particles between jet axes in three jet events, while the independent fragmentation model does not. We verify that the failure of the independent fragmentation model is not a consequence of parameter tuning or of model variant. The Webber cluster model, which is untuned, does not describe the absolute particle densities between jets but correctly predicts the ratios of those densities, which are less sensitive to the tuning. These results provide evidence that the sources of hadrons are boosted with respect to the overall center-of-mass in three jet events, with components of motion normal to the jet axes. The distribution of particles close to jet axes provides additional support for this conclusion. 94 refs.
Author: Michael Riordan
Publisher: World Scientific Publishing Company
ISBN:
Category : Science
Languages : en
Pages : 576
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![Inclusive p°-production [pi-production] by e+e- [ee] annihilation at 34.6 GeV center of mass energy PDF](https://books.google.com/books/content/images/frontcover/9H-eHAAACAAJ?fife=w80-h100)
Author: Deutsches Elektronen-Synchrotron (Hamburg)
Publisher:
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Category :
Languages : de
Pages :
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