Author: David Brian White
Publisher:
ISBN:
Category :
Languages : en
Pages : 230

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Author: Jason William Brudvik
Publisher:
ISBN: 9780549130093
Category :
Languages : en
Pages : 240

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This dissertation presents the results of a measurement of the branching ratio for the rare decay eta → pi0gammagamma. The experiment was carried out in the A2 hall of the Mainz Microtron facility at the Institut fur Kernphysik, on the campus of Johannes Gutenberg Universitat Mainz, in Mainz, Germany. The experiment used the Glasgow-Mainz Tagger, which is a recoil-electron spectrometer, to determine the energy of the incident photons. The principal detector is the Crystal Ball, a highly segmented multiphoton spectrometer covering nearly 4pi steradians surrounding the experimental target. There is also a forward detector, TAPS, which is a multiphoton spectrometer arranged as a downstream wall of detectors. Furthermore, our setup includes an instrument used to differentiate between charged and neutral particles called the Particle Identification Detector, and a liquid hydrogen target. The kinematic-fit technique was used to select the eta → pi 0gammagamma events. The major backgrounds, namely eta → 3pi0 and eta → gammagamma decay and 2pi 0 production were measured simultaneously. The result for the branching ratio is BR(eta → pi0gammagamma) = (2.0+/-0.7) x 10-4. This corresponds to a partial width of Gamma (eta → pi0gammagamma) = 0.26 +/- 0.10 eV. This result is somewhat smaller than the result of recent experiments, it is consistent with theoretical calculations based on Chiral Perturbation Theory.

Author: Hartmut Machner
Publisher: World Scientific
ISBN: 9814549169
Category :
Languages : en
Pages : 618

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The investigation of hadronic and nuclear probes with protons and electrons in the energy range of a few GeV is of great importance for the understanding of the properties of nucleons and mesons as well as of their interaction. Experimental results from studies with these beams provide the basis for the development and the tests of theoretical approaches in the energy regime of non-perturbative QCD. They can also clarify the effect of the nuclear medium on elementary reactions. The conference has reviewed the present status of this field of research. The topics have beenThe conference topics comprised investigations near energy thresholds in the tradition of the conferences on Particle Production near Threshold in Nashville, IN, USA, 1990, and Uppsala, Sweden, 1992.

Author: Sally Seidel
Publisher: World Scientific
ISBN: 9814549967
Category :
Languages : en
Pages : 2088

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This book presents the latest results from high energy physics laboratories. The topics discussed include: Cosmology, Heavy Ions, Electroweak, Heavy Flavour Physics and CP Violation/Rare Decays, QCD and Beyond the Standard Model, Planck Scale Physics, Accelerator and Non-Accelerator Physics and Instrumentation.

Author: Mitch R. Wayne
Publisher:
ISBN:
Category : Mesons
Languages : en
Pages : 408

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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 518

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Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 1216

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Author: James Eugene Enstrom
Publisher:
ISBN:
Category :
Languages : en
Pages : 248

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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 984

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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1330

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