Electromagnetic Contributions to the Charge Asymmetry in the Semileptonic Decays of Neutral Kaons

C. Ryan

doi:10.1103/PhysRevD.1.299

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Electromagnetic Contributions to the Charge Asymmetry in the Semileptonic Decays of Neutral Kaons

C. Ryan^*

International Atomic Energy Agency, International Centre for Theoretical Physics, Miramare, Trieste

^*Permanent address: Department of Mathematical Physics, University College, Dublin, Ireland.

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Phys. Rev. D 1, 299 – Published 1 January, 1970

DOI: https://doi.org/10.1103/PhysRevD.1.299

Abstract

While the measured charge asymmetry in the semileptonic decays of ${K_{L}}^{0}$ is clear-cut evidence for $CP$ violation in these processes, the detailed theoretical interpretation of this result is somewhat complicated by the presence of electromagnetic effects. It is shown, however, that whereas these electromagnetic effects can produce sizable differences in decay distributions for decays into charge-conjugate states, their contribution to the asymmetry parameter ${δ_{L}}^{π}$ is not greater than $\frac{α Γ ({K_{l 4}}^{0})}{Γ ({K_{l 3}}^{0})}$ .

References (13)

T. D. Lee, R. Oehme, and C. N. Yang, Phys. Rev. 106, 340 (1957)
S. Bennett, D. Nygren, H. Saal, J. Steinberger, and J. Sunderland, Phys. Rev. Letters 19, 993 (1967)
D. Dorfan, J. Enstrom, D. Raymond, M. Schwartz, and S. Wojcicki, Phys. Rev. Letters 19, 987 (1967)
S. Bennett, D. Nygren, H. Saal, J. Sunderland, and J. Steinberger, Phys. Letters 27B, 239 (1968)
J. Steinberger, in Proceedings of the Topical Conference on Weak Interactions, CERN, 1969 (unpublished)
J. H. Christenson, J. W. Cronin, V. L. Fitch, and R. Turlay, Phys. Rev. Letters 13, 138 (1964)
L. B. Okun and C. Rubbia have touched on this matter in their report in Proceedings of the International Conference on Elementary Particles, Heidelberg, 1967, edited by H. Filthuth (North-Holland Publishing Co., Amsterdam, 1968) N. Byers, S. McDowell, and C. N. Yang, High-Energy Physics and Elementary Particles (International Atomic Energy Agency, Vienna, 1965), p. 953 I. B. Khriplovich and L. B. Okun, Phys. Letters 26B, 672 (1967)
C. Ryan, in Lectures in High-Energy Physics II, edited by H. H. Aly (Gordon and Breach, Science Publishers, Inc., New York, to be published)
J. Bernstein, G. Feinberg, and T. D. Lee, Phys. Rev. 139B, 1850 (1965)
L. Wolfenstein, Phys. Rev. Letters 13, 562 (1967)
[J. Cronin, in Proceedings of the Fourteenth International Conference on High-Energy Physics, Vienna, 1968 (CERN, Geneva, 1968), p. 281] (J. Steinberger, [5])
S. Bennett, D. Nygren, H. Saal, J. Steinberger, and J. Sunderland, Phys. Rev. Letters 19, 997 (1967) Phys. Letters 27B, 244 (1968) ibid.27B, 288 (1968) J. Steinberger, [5]
E. S. Ginsberg, Phys. Rev. 171, 1675 (1968) ibid.174, 2169(E) (1968) ibid.187, 2280(E) (1969)

[c1] T. D. Lee, R. Oehme, and C. N. Yang, Phys. Rev. 106, 340 (1957)

[c2] S. Bennett, D. Nygren, H. Saal, J. Steinberger, and J. Sunderland, Phys. Rev. Letters 19, 993 (1967)

[c3] D. Dorfan, J. Enstrom, D. Raymond, M. Schwartz, and S. Wojcicki, Phys. Rev. Letters 19, 987 (1967)

[c4] S. Bennett, D. Nygren, H. Saal, J. Sunderland, and J. Steinberger, Phys. Letters 27B, 239 (1968)

[c5] J. Steinberger, in Proceedings of the Topical Conference on Weak Interactions, CERN, 1969 (unpublished)

[c6] J. H. Christenson, J. W. Cronin, V. L. Fitch, and R. Turlay, Phys. Rev. Letters 13, 138 (1964)

[c7] L. B. Okun and C. Rubbia have touched on this matter in their report in Proceedings of the International Conference on Elementary Particles, Heidelberg, 1967, edited by H. Filthuth (North-Holland Publishing Co., Amsterdam, 1968) N. Byers, S. McDowell, and C. N. Yang, High-Energy Physics and Elementary Particles (International Atomic Energy Agency, Vienna, 1965), p. 953 I. B. Khriplovich and L. B. Okun, Phys. Letters 26B, 672 (1967)

[c8] C. Ryan, in Lectures in High-Energy Physics II, edited by H. H. Aly (Gordon and Breach, Science Publishers, Inc., New York, to be published)

[c9] J. Bernstein, G. Feinberg, and T. D. Lee, Phys. Rev. 139B, 1850 (1965)

[c10] L. Wolfenstein, Phys. Rev. Letters 13, 562 (1967)

[c11] [J. Cronin, in Proceedings of the Fourteenth International Conference on High-Energy Physics, Vienna, 1968 (CERN, Geneva, 1968), p. 281] (J. Steinberger, [5])

[c12] S. Bennett, D. Nygren, H. Saal, J. Steinberger, and J. Sunderland, Phys. Rev. Letters 19, 997 (1967) Phys. Letters 27B, 244 (1968) ibid.27B, 288 (1968) J. Steinberger, [5]

[c13] E. S. Ginsberg, Phys. Rev. 171, 1675 (1968) ibid.174, 2169(E) (1968) ibid.187, 2280(E) (1969)

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Electromagnetic Contributions to the Charge Asymmetry in the Semileptonic Decays of Neutral Kaons

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