Measurement of epsilon'/epsilon

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After twenty years of intense scrutiny CP violation is apparently still well described, if not explained, by the superweak hypothesis, in which absolute values ..delta..S = 2 (T-violating) transitions between the K/sup 0/, anti K/sup 0/ states induce CP violating impurities in the K/sub L//sup 0/, K/sub S//sup 0/ states. CP-violating effects observed in the K/sup 0/ - anti K/sup 0/ system can be described in terms of one parameter, absolute values epsilon approx. = 2 x 10/sup -3/, which defines the portion of the CP-even state K/sub 1//sup 0/ found in the predominantly CP-odd K/sub L//sup 0/ state: K/sub ... continued below

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Pages: 3

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Schmidt, M.P.; Adair, R.K.; Black, J.K.; Blatt, S.R.; Campbell, M.K.; Kasha, H. et al. January 1, 1984.

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Description

After twenty years of intense scrutiny CP violation is apparently still well described, if not explained, by the superweak hypothesis, in which absolute values ..delta..S = 2 (T-violating) transitions between the K/sup 0/, anti K/sup 0/ states induce CP violating impurities in the K/sub L//sup 0/, K/sub S//sup 0/ states. CP-violating effects observed in the K/sup 0/ - anti K/sup 0/ system can be described in terms of one parameter, absolute values epsilon approx. = 2 x 10/sup -3/, which defines the portion of the CP-even state K/sub 1//sup 0/ found in the predominantly CP-odd K/sub L//sup 0/ state: K/sub L//sup 0/ proportional to K/sub 2//sup 0/ + epsilon K/sub 1//sup 0/. A precise measurement of the relative rates for the CP-violating decays K/sub L//sup 0/ ..-->.. ..pi../sup +/..pi../sup -/ and K/sub S//sup 0/ ..-->.. ..pi../sup 0/..pi../sup 0/ in principle provides a test for absolute values ..delta..S = 1 CP-violating amplitudes which result in deviations from the superweak predictions: eta /sup 00/ = eta /sup + -/ = epsilon, where eta /sup + -/ and eta /sup 00/ are the ratios of K/sub L/ to K/sub S/ decay amplitudes into ..pi../sup +/..pi../sup -/ and ..pi../sup 0/..pi../sup 0/ final states. Gauge theory models of CP-violation are in general constructed to nearly mimic superweak predictions by having the dominant contribution to CP-violation arise from complex terms in the K/sup 0/ - anti K/sup 0/ mixing amplitudes. However, there are usually additional contributions in the form of direct CP violating absolute values ..delta..S = 1 decay amplitudes, parametrized by epsilon', which are not identical for the weak transitions into isospin I = 0 and 2 ..pi pi.. final states. The Yale-BNL group has recently completed a measurement of R and thus epsilon'/epsilon at the Brookhaven AGS. Results are presented.

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Pages: 3

Notes

NTIS, PC A02/MF A01.

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  • American Physical Society meeting, Santa Fe, NM, USA, 31 Oct 1984

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  • Other: DE85006687
  • Report No.: BNL-35841
  • Report No.: CONF-8410222-3
  • Grant Number: AC02-76ER03075
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 6261744
  • Archival Resource Key: ark:/67531/metadc1109229

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  • January 1, 1984

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

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  • March 20, 2018, 5:44 p.m.

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Schmidt, M.P.; Adair, R.K.; Black, J.K.; Blatt, S.R.; Campbell, M.K.; Kasha, H. et al. Measurement of epsilon'/epsilon, article, January 1, 1984; United States. (digital.library.unt.edu/ark:/67531/metadc1109229/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.