Partial-wave Analysis of the Radiative Decay of J/psi Into P Pbar PDF Download
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Category : Power resources
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Pages : 644
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Category : Power resources
Languages : en
Pages : 510
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J/psi physics is discussed which will be of interest at T> 1988, the period of operation of the Beijing Electron Positron Collider. Emphasis is placed on the gluonic states which are best studied in radiative J/psi decay. The difficulties of these studies are discussed and the need for very high statistics is stressed. In particular it is essential to partial-wave-analyze the hadronic final states produced in J/psi .-->. .gamma.X. An estimate using fixed target data suggests that 0(108) J/psi decays are needed to do an unambiguous partial wave analysis for hadron masses up to about 2 GeV. This requirement is an excellent match to the BEPC design parameters, which imply production of 0(108) J/psi's per year. With a J/psi production rate an order of magnitude greater than other electron-positron storage rings, BEPC will be a unique world facility for these studies. 58 references.
Author: United States. Energy Research and Development Administration. Technical Information Center
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Category : Force and energy
Languages : en
Pages : 1682
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Category : Nuclear energy
Languages : en
Pages : 612
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Category : Government reports announcements & index
Languages : en
Pages : 1832
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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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Category : Particles (Nuclear physics)
Languages : en
Pages : 360
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![Observation of a Near-Threshold Enhancement in the P-anti-p Mass Spectrum from Radiative J/psi --] Gamma-p-anti-p Decays PDF](https://books.google.com/books/content/images/frontcover/GIuwAQAACAAJ?fife=w80-h100)
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We observe a narrow enhancement near 2m{sub p} in the invariant mass spectrum of p{bar p} pairs from radiative J/[psi] 2![gamma]p{bar p} decays. No similar structure is seen in J/[psi] 2![pi]° p{bar p} decays. The results are based on an analysis of a 58 million event sample of J/[psi] decays accumulated with the BESII detector at the Beijing electron-positron collider. The enhancement can be fit with either an S- or P-wave Breit Wigner resonance function. In the case of the S-wave fit, the peak mass is below 2m{sup p} at M = 185910{sup +3} (stat)25{sup +5} (sys) MeV/c2 and the total width is [Lambda]
