Branching Ratio and Mass Spectrum of the Decay [upsilon]' → [upsilon] [pi] + [pi] - PDF Download
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![Branching Ratio and Mass Spectrum of the Decay [upsilon]' → [upsilon] [pi] + [pi] - PDF](https://books.google.com/books/content/images/frontcover/qhyMzQEACAAJ?fife=w150-h200)
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Languages : en
Pages : 2
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![Branching Ratio and Mass Spectrum of the Decay [upsilon]' → [upsilon] [pi] + [pi] - PDF](https://books.google.com/books/content/images/frontcover/qhyMzQEACAAJ?fife=w80-h100)
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Languages : en
Pages : 2
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Author: ARGUS Collaboration
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Category :
Languages : en
Pages : 7
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![Measurement of the Decay UPSILON(2S). --]. Pi. °. Pi. °UPSILON(1S). PDF](https://books.google.com/books/content/images/frontcover/2AyfAQAACAAJ?fife=w80-h100)
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Languages : en
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The hadronic transitions UPSILON(2S) .-->. .pi.°.pi. UPSILON(1S) .-->. .gamma gamma gamma gamma.ll− (l = .mu. or e) are investigated using the Crystal Ball detector. The analysis is based on 193,000 UPSILON(2S) events produced at the DORIS II ee− storage ring from November 1982 to February 1984. We observe 44 events with a muon pair and 46 events with an electron pair in the final state. The signals in both channels are relatively background free. Assuming lepton universality, we average the results for the two channels and obtain the product branching ratio B(UPSILON(2S) .-->. .pi.°.pi.°UPSILON(1S)) x B/sub ll/(UPSILON(1S)) = (2.3 +- 0.3 +- 0.3) x 10−3 where the first error is statistical and the second is systematic. Using the present world average value of B/sub ll/(UPSILON(1S)) = (2.9 +- 0.3)% we derive a branching ratio B(UPSILON(2S) .-->. .pi.°.pi.°UPSILON(1S)) = (8.0 +- 1.5)% where the statistical and systematic errors have been added in quadrature. This result is compared with previous results for the charged pion transitions UPSILON(2S) .-->. .pi.+.pi.−UPSILON(1S) and with the expectation from theory. We have also investigated the mass spectrum M/sub .pi.°.pi.°/ resulting from these decays and find a peaking toward high masses not accounted for the phase space alone. Fits to the .pi.°.pi.° mass spectrum are in quantitative agreement with previous results for the .pi.+.pi.− transitions. Angular distribution for the .pi.°.pi.° system and its decay products are presented in reference frames appropriate for analyzing the spin of the .pi.°.pi.° system, even if the initial UPSILON(1S) and the di-pion system are emitted in a relative S-wave. We find the decay distributions to be consistent with those expected for a spin zero di-pion system emitted in a relative S-wave with the UPSILON(1S).
 Goes to [pi]0[pi]0[upsilon](1S) PDF](https://books.google.com/books/content/images/frontcover/PIYgAQAAIAAJ?fife=w80-h100)
Author: David Michael Gelphman
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Category :
Languages : en
Pages : 254
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Category : Particles (Nuclear physics)
Languages : en
Pages : 638
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Category : Nuclear energy
Languages : en
Pages : 658
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Category : Power resources
Languages : en
Pages : 664
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Author: G. P. Yost
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Category : Information storage and retrieval systems
Languages : en
Pages : 604
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Author: E. Klempt
Publisher: Elsevier
ISBN: 1483278026
Category : Science
Languages : en
Pages : 457
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The Hadron Mass Spectrum covers the proceedings of the Rheinfels Workshop on the Hadron Mass Spectrum, held in St. Goar, Germany on September 3-6, 1990. The book focuses on the processes, methodologies, and reactions involved in hadron spectroscopy. The selection first offers information on strange meson and strangeonium spectroscopy and strangeonium production from LASS. The book also takes a look at the status of strange meson spectroscopy, including status of the spectroscopy, systematics of the level structure, and contributions from LASS. The publication examines the scalar meson enigma and two photon couplings of scalar and tensor mesons. The manuscript also touches on rhoprimes, omegaprimes, and glueballs; meson production mechanisms and selection criteria for cryptoexotic states; and light meson spectroscopy and threshold effects. The selection is a dependable reference for readers interested in hadron mass spectrum.
![Branching Ratio for Pion-beta Decay: [pi]+ --> [pi]0 + [epsilon]+ + [gamma] PDF](https://books.google.com/books/content/images/frontcover/g2eZVNhHjr8C?fife=w80-h100)
Author: Robert Bruce Bacastow
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Languages : en
Pages : 62
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