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Asymmetry Parameter of Λ Decay and the Intermediate Boson of Weak Interactions

Oneda, S. and Pati, J. C. and Sakita, B. (1961) Asymmetry Parameter of Λ Decay and the Intermediate Boson of Weak Interactions. Physical Review Letters, 6 (1). pp. 24-26. ISSN 0031-9007. doi:10.1103/PhysRevLett.6.24.

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The magnitude of the pion asymmetry parameter α- of the Λ → p + π- decay has been determinted [1] to be greater than or equal to (0.73 ± 0.14). The sign of this parameter, however, is rather hard to find. The results of Boldt et al. [2] anf the preliminary results of Birge and Fowler [3] indicated a positive sign for α-. Recently, however, Birge and Fowler [4] have reported a negative sign for α-, contrary to their own preliminary [3] results. In this Letter we wish to point out that the negative sign of α-, provides a favorable argument for the conjecture that the V-A four-fermion interaction may be mediated by a vector boson.

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Additional Information:©1961 The American Physical Society Received 28 November 1960 Two of us (S.O. and J.C.P.) would like to thank Professor John S. Toll for the extremely kind hospitality extended to them during their stay at the University of Maryland, where part of this work was carried out. One of us (J.C.P.) takes pleasure in thanking Professor M. Gell-Mann for his critical comments, and the California Institute of Technology for the offer of the Richard C. Tolman Fellowship. This research was supported in part by the U.S. Air Force through the Air Force Office of Scientific Research of the Air Research and Development Command. Supported in part by the University of Wisconsin Research Committee with funds granted by the Wisconsin Alumni Research Foundation and in part by the U.S. Atomic Energy Commission.
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