Measurement of the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>CP</mi></math></span>-nonconserving decay, <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msubsup><mrow><mi>K</mi></mrow><mrow><mi>L</mi></mrow><mrow><mn>0</mn></mrow></msubsup></mrow><mo>→</mo><mn>2</mn><mrow><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup></mrow></math></span>

C. A. Rey; R. J. Cence; B. D. Jones; S. I. Parker; V. Z. Peterson; V. J. Stenger; R. W. Kenney; I. R. Linscott; W. P. Oliver

doi:10.1103/PhysRevD.13.1161

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Measurement of the $CP$ -nonconserving decay, $K_{L}^{0} \to 2 π^{0}$

C. A. Rey^*

R. J. Cence, B. D. Jones^†, S. I. Parker, V. Z. Peterson, and V. J. Stenger^‡

R. W. Kenney, I. R. Linscott^§, and W. P. Oliver^‡,∥

Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556

Department of Physics and Astronomy, University of Hawaii, Honolulu, Hawaii 96822

Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

^*Research supported in part by the National Science Foundation.
^†Present address: Rutherford High Energy Laboratory, Chilton, Didcot, Berkshire, England.
^‡Work supported by the United States Atomic Energy Commission.
^§Present address: Syracuse University, Syracuse, New York 13210.
^∥Present address: University of Washington, Seattle, Washington 98105.

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Phys. Rev. D 13, 1161 – Published 1 March, 1976

DOI: https://doi.org/10.1103/PhysRevD.13.1161

Abstract

The rate of the $CP$ -nonconserving decay $K_{L}^{0} \to 2 π^{0}$ has been measured using a monoenergetic $K$ beam and a nearly- $4 π$ -solid-angle detector system employing lead-plate spark chambers and shower counters. Final results based on a detailed analysis of the complete data set are given. The branching ratio of $K_{L}^{0} \to 2 π^{0}$ is determined relative to three different normalizations, $K_{L}^{0} \to 3 π^{0}$ , $K_{L}^{0} \to all charged decay modes$ , and $K_{L}^{0} \to K_{S}^{0}$ using a beryllium regenerator. From the $K_{L}^{0} \to 2 π^{0}$ rate we find the $CP$ -nonconserving parameter ${| η_{00} |}^{2} = [14.1 \pm 1.9 (stat) \pm 1.5 (syst)] \times 10^{- 6}$ .

References (38)

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[c1] J. H. Christenson, J. W. Cronin, V. L. Fitch, and R. Turlay, Phys. Rev. Lett. 13, 138 (1964)

[c2] J. Steinberger, in Proceedings of the Topical Conference on Weak Interactions, Geneva, 1969, CERN Report No. 69-7 (unpublished)

[c3] R. J. Cence et al., UCRL Report No. 18368 (Rev.), 1968 (unpublished)

[c4] T. B. Risser, Ph.D. thesis, UCRL Report No. 20039, 1970 (unpublished)

[c5] J. C. Doyle, Ph.D. thesis, UCRL Report No. 18139, 1969 (unpublished)

[c6] S. I. Parker and C. A. Rey, Nucl. Instrum. Meth. 43, 361 (1966) C. A. Rey and S. I. Parker, ibid. 54, 314 (1967)

[c7] W. P. Oliver, Ph.D. thesis, UCRL Report No. 19397, 1967 (unpublished)

[c8] I. Linscott, Ph.D. thesis, LBL Report No. 995, 1972 (unpublished)

[c9] P. Heusse, B. Aubert, C. Pascaud, and J. Vialle, Lett. Nuovo Cimento 3, 449 (1970)

[c10] G. W. Grodstein, NBS Circular 583, 1957 (unpublished)

[c11] V. Fitch, in Proceedings of the Second Hawaii Topical Conference on Particle Physics, edited by S. Pakvasa and S. F. Tuan (Hawaii Univ. Press, Honolulu, Hawaii, 1968)

[c12] R. H. Good, R. P. Matsen, F. Muller, O. Piccioni, W. M. Powell, H. S. White, W. B. Fowler, and R. W. Birge, Phys. Rev. 124, 1223 (1961)

[c13] Omitted endnote

[c14] J. H. Christenson, J. W. Cronin, V. L. Fitch, and R. Turlay, Phys. Rev. 140, B74 (1965), Eq. (7)

[c15] [12]

[c16] Particle Data Group, Rev. Mod. Phys. 45, S1 (1973)

[c17] M. Banner, J. W. Cronin, J. K. Liu, and J. E. Pilcher, Phys. Rev. Lett. 21, 1107 (1968)

[c18] M. Banner, J. W. Cronin, J. L. Liu, and J. E. Pilcher, Phys. Rev. 188, 2033 (1969) (final analysis of [17])

[c19] R. J. Cence, B. D. Jones, V. Z. Peterson, V. J. Stenger, J. Wilson, D. I. Cheng, R. D. Eandi, R. W. Kenney, I. Linscott, W. P. Oliver, S. I. Parker, and C. A. Rey, Phys. Rev. Lett. 22, 1210 (1969)

[c20] J.-M. Gaillard, F. Krienen, W. Galbraith, A. Hussri, M. R. Jane, N. H. Lipman, G. Manning, T. J. Ratcliffe, P. Day, A. G. Parham, B. T. Payne, A. C. Sherwood, H. Faissner, and H. Reithler, Phys. Rev. Lett. 18, 20 (1967)

[c21] J. W. Cronin, P. F. Kunz, W. S. Risk, and P. C. Wheeler, Phys. Rev. Lett. 18, 25 (1967)

[c22] T. Kamae, Ph.D. thesis, Princeton Report No. 45, 1968 (unpublished)

[c23] D. F. Bartlett, R. K. Carnegie, V. L. Fitch, K. Goulianos, D. P. Hutchinson, T. Kamae, R. F. Roth, J. S. Russ, and W. Vernon, Phys. Rev. Lett. 21, 558 (1968)

[c24] P. C. Wheeler, Ph.D. thesis, Princeton Report No. 47, 1968 (unpublished)

[c25] J. K. Liu, Ph.D. thesis, Princeton Report No. 48, 1968 (unpublished)

[c26] I. A. Budagov, D. C. Cundy, G. Myatt, F. A. Nezrick, G. H. Trilling, W. Venus, H. Yoshiki, B. Aubert, P. Heusse, I. LeDong, J. P. Lowys, D. Morellet, E. Nagy, C. Pascaud, L. Behr, P. Beillière, G. Boutang, M. Schiff and J. Vander Velde, Phys. Lett. 28B, 215 (1968)

[c27] J.-M. Gaillard, W. Galbraith, A. Hussri, M. R. Jane, N. H. Lipman, G. Manning, T. J. Ratcliffe, H. Faissner, and H. Reithler, Nuovo Cimento 59A, 453 (1969) (final analysis of [20])

[c28] J. C. Chollet, J.-M. Gaillard, M. R. Jane, T. J. Ratcliffe, J.-P. Repellin, K. R. Schubert, and B. Wolff, CERN Report No. 69-7, 309, 1969 (unpublished)

[c29] I. A. Budagov, D. C. Cundy, G. Myatt, F. A. Nezrick, G. H. Trilling, W. Venus, H. Yoshiki, B. Aubert, P. Heusse, I. LeDong, J. P. Lowys, D. Morellet, E. Nagy, C. Pascaud, L. Behr, P. Beillière, G. Boutang, and M. Schiff, Phys. Rev. D 5, 815 (1970) (final analysis of [26])

[c30] J. C. Chollet, J.-M. Gaillard, M. R. Jane, T. J. Ratcliffe, J.-P. Repellin, K. R. Schubert, and B. Wolff, Phys. Lett. 31B, 658 (1970)

[c31] H. Faissner, H. Reithler, W. Thomé, J.-M. Gaillard, W. Galbraith, M. R. Jane, N. H. Lipman, and G. Manning, Nuovo Cimento 70A, 57 (1970) ([20,27])

[c32] V. V. Barmin, V. G. Barylov, V. S. Borisov, G. K. Bysheva, G. S. Veselovsky, V. M. Golubchikov, L. L. Goldin, G. V. Davidenko, A. G. Dolgolenko, V. S. Demidov, N. K. Zombkovskaya, L. N. Kondratiev, N. S. Konoplev, A. G. Meshkovsky, G. S. Mirosidi, G. K. Tumanov, T. A. Chistyakova, I. V. Chuvilo, V. A. Shebanov, E. M. Bogdanovicz, V. B. Vinogradov, I. A. Ivanovskaya, T. I. Kanarek, V. A. Maximenko, Z. I. Ogrzevalski, L. S. Okhrimenko, and Z. S. Strugalski, Phys. Lett. 33B, 377 (1970)

[c33] B. Wolff, J. C. Chollet, J.-P. Repellin, J.-M. Gaillard, M. R. Jane, and K. R. Schubert, Phys. Lett. 36B, 517 (1971) (continuation of [30])

[c34] U. Heeren, Nuovo Cimento 11A, 305 (1972) (uses data of [20,27])

[c35] M. Banner, J. W. Cronin, C. M. Hoffman, B. C. Knapp, and M. J. Shochet, Phys. Rev. Lett. 28, 1597 (1972)

[c36] M. Holder, E. Radermacher, A. Staude, P. Darriulat, J. Deutsch, M. Hansroul, S. Orito, J. Pilcher, C. Rubbia, P. Strolin, K. Tittel, A. Fainberg, C. Grosso-Pilcher, and M. Scire, Phys. Lett. 40B, 141 (1972)

[c37] G. Akavia, R. Coombes, D. Dorfan, J. Enstrom, D. Fryberger, R. Piccioni, D. Porat, D. Raymond, K. Riley, A. Rothenberg, H. Saal, M. Schwartz, and S. Wojcicki, SLAC Report No. 145, 1972 (unpublished)

[c38] D. R. Nygren, LBL Report No. 2407, 1973 (unpublished)

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Measurement of the $CP$ -nonconserving decay, $K_{L}^{0} \to 2 π^{0}$

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Measurement of the CP-nonconserving decay, KL0→2π0

Abstract

References (38)

Measurement of the $CP$ -nonconserving decay, $K_{L}^{0} \to 2 π^{0}$