Determination of the Axial-vector Form Factor in the Radiative Decay of the Pion. [Phase Space, Branching Ratio]. PDF Download
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![Determination of the Axial-vector Form Factor in the Radiative Decay of the Pion. [Phase Space, Branching Ratio]. PDF](https://books.google.com/books/content/images/frontcover/U2p0AQAACAAJ?fife=w150-h200)
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The branching ratio for the decay .pi. .-->. e.nu gamma. was measured in a counter experiment in which the e was detected in a magnetic spectrometer and the .gamma.-ray in a lead glass hodoscope. The number of observed events is 226.2 +- 22.4. The branching ratio into the phase space with electron momentum above 56 MeV/c and the electron/photon opening angle greater than 132° is found to be (5.6 +- 0.7) x 10−8. From the measured branching ratio one determines .gamma., the ratio of the axial vector to vector form factor. The vector form factor is computed using CVC and the .pi.° lifetime. For T/sub .pi./° = 0.828 x 10−16 sec, .gamma. = 0.44 +- 0.12 or .gamma. = --2.36 +- 0.12 is obtained. A comparison between the measured values of .gamma. and various theories is made.
![Determination of the Axial-vector Form Factor in the Radiative Decay of the Pion. [Phase Space, Branching Ratio]. PDF](https://books.google.com/books/content/images/frontcover/U2p0AQAACAAJ?fife=w80-h100)
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The branching ratio for the decay .pi. .-->. e.nu gamma. was measured in a counter experiment in which the e was detected in a magnetic spectrometer and the .gamma.-ray in a lead glass hodoscope. The number of observed events is 226.2 +- 22.4. The branching ratio into the phase space with electron momentum above 56 MeV/c and the electron/photon opening angle greater than 132° is found to be (5.6 +- 0.7) x 10−8. From the measured branching ratio one determines .gamma., the ratio of the axial vector to vector form factor. The vector form factor is computed using CVC and the .pi.° lifetime. For T/sub .pi./° = 0.828 x 10−16 sec, .gamma. = 0.44 +- 0.12 or .gamma. = --2.36 +- 0.12 is obtained. A comparison between the measured values of .gamma. and various theories is made.
Author: Douglas Alan Ortendahl
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Languages : en
Pages : 262
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Languages : en
Pages :
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Author: United States. Energy Research and Development Administration
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Category : Medicine
Languages : en
Pages : 800
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Author: United States. Energy Research and Development Administration. Technical Information Center
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Category : Force and energy
Languages : en
Pages : 982
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ISBN:
Category : Nuclear energy
Languages : en
Pages : 744
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Category : Aeronautics
Languages : en
Pages : 1330
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Category : Power resources
Languages : en
Pages : 428
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![First Observation of the Decay. Pi. . --]. Ee−e+. Nu. and a Determination of the Form Factors F PDF](https://books.google.com/books/content/images/frontcover/WOmMAQAACAAJ?fife=w80-h100)
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The radiative pion decay .pi. .-->. ee−e+.nu. has been observed for the first time with a branching ratio of (3.4 +- 0.5) x 10−9. From the kinematical distribution of 79 events information on the form factors was extracted. The vector form factor F/sub V/ was found to have the same sign as the pion decay constant f/sub .pi./. For the axial-vector form factors the following values have been measured: .gamma. = F/sub A//F/sub V/ = 0.7 +- 0.5 and xi = R/F/sub V/ = 2.3 +- 0.6. This value of .gamma. agrees well with the small positive value of (0.53 +- 0.06) and excludes the large negative value obtained in .pi.+ .-->. e+.nu gamma. experiments. 8 refs. 8 refs.
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Category : Nuclear energy
Languages : en
Pages : 1438
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