Determination of the Branching Ratio and Certain Distributions for Two Modes of Decay of the [eta]0 Meson
Author: John Arthur Campbell
Publisher:
Published: 1964
Total Pages: 178
ISBN-13:
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Author: John Arthur Campbell
Publisher:
Published: 1964
Total Pages: 178
ISBN-13:
DOWNLOAD EBOOKAuthor: Jason William Brudvik
Publisher:
Published: 2007
Total Pages: 240
ISBN-13: 9780549130093
DOWNLOAD EBOOKThis 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: David Brian White
Publisher:
Published: 1994
Total Pages: 230
ISBN-13:
DOWNLOAD EBOOKAuthor: Michael Wood Peters
Publisher:
Published: 1964
Total Pages: 140
ISBN-13:
DOWNLOAD EBOOKAuthor: Harold Lee Yarger
Publisher:
Published: 1968
Total Pages: 212
ISBN-13:
DOWNLOAD EBOOKAuthor:
Publisher:
Published: 1971
Total Pages: 300
ISBN-13:
DOWNLOAD EBOOKAuthor: Steven W. Culy
Publisher:
Published: 1996
Total Pages: 452
ISBN-13:
DOWNLOAD EBOOKAuthor: Chris Jones
Publisher:
Published: 2006
Total Pages: 96
ISBN-13:
DOWNLOAD EBOOKAuthor: Henning Berghäuser
Publisher: Sudwestdeutscher Verlag Fur Hochschulschriften AG
Published: 2011-06
Total Pages: 268
ISBN-13: 9783838124315
DOWNLOAD EBOOKThe investigation of Dalitz decays of neutral mesons is of general interest because the electromagnetic transition form factors observed in such decays provide a possibility to obtain information about the electromagnetic properties of the mesons as well as about their internal substructures. As a matter of fact quantum electrodynamics (QED) fails a correct prediction of Dalitz decays simply because the particles of focus are not point like. For that reason the vector meson dominance model (VMD) has been developed, which still requires further experimental verification. In the picture of VMD a virtual photon can couple to a vector meson as an intermediate state. With the CB/TAPS experiment at MAMI-C in Mainz, Germany, the Dalitz decays of the eta and the pion meson were measured and the associated transition form factors could be extracted. Moreover other decay modes of the pion, eta and the omega meson were investigated in order to determine the corresponding branching ratios. Beside a short theoretical introduction into the field of interest this work presents a full description of the experimental setup and contains detailed information about all steps of the analysis.
Author: Douglas Corey Reher
Publisher:
Published: 2000
Total Pages: 316
ISBN-13:
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