First evidence for the decay KL→e+e−μ+μ−

P. Gu; P. Haas; W. P. Hogan; S. K. Kim; J. N. Matthews; S. S. Myung; S. Schnetzer; G. B. Thomson; Y. Zou; K. Arisaka; D. Roberts; W. Slater; M. B. Spencer; M. Weaver; R. A. Briere; E. Cheu; D. A. Harris; P. Krolak; K. S. McFarland; A. Roodman; B. Schwingenheuer; S. V. Somalwar; Y. W. Wah; B. Winstein; R. Winston; A. R. Barker; E. C. Swallow; G. J. Bock; R. Coleman; M. Crisler; J. Enagonio; R. Ford; Y. B. Hsiung; D. A. Jensen; V. R. O’Dell; E. Ramberg; R. Tschirhart; E. M. Collins; G. D. Gollin; T. Nakaya; T. Yamanaka

doi:10.1103/PhysRevLett.76.4312

First evidence for the decay KL→e⁺e⁻μ⁺μ⁻

P. Gu
, P. Haas
, W. P. Hogan
, S. K. Kim
, J. N. Matthews
, S. S. Myung
, S. Schnetzer
, G. B. Thomson
, Y. Zou
, K. Arisaka
, D. Roberts
, W. Slater
, M. B. Spencer
, M. Weaver
, R. A. Briere
, E. Cheu
, D. A. Harris
, P. Krolak
, K. S. McFarland
, A. Roodman

B. Schwingenheuer, S. V. Somalwar, Y. W. Wah, B. Winstein, R. Winston, A. R. Barker, E. C. Swallow, G. J. Bock, R. Coleman, M. Crisler, J. Enagonio, R. Ford, Y. B. Hsiung, D. A. Jensen, V. R. O’Dell, E. Ramberg, R. Tschirhart, E. M. Collins, G. D. Gollin, T. Nakaya, T. Yamanaka

Research output: Contribution to journal › Article › peer-review

Abstract

We present the first evidence for the decay KL→e⁺e⁻μ⁺μ⁻ based on the observation of one event with an estimated background of 0.067_-0.025^+0.057 event. We determine the branching ratio to be B(KL→e⁺e⁻μ⁺μ⁻)=(2.9_-2.4^+6.7)×10-9. In addition, we set a 90% confidence upper limit on the combined branching ratio for the lepton flavor violating decays K_L→e∓e∓μ±μ± to be B(K_L→e∓e∓μ±μ±<)<6.1×10-9 assuming a uniform phase space distribution.

Original language	English (US)
Pages (from-to)	4312-4315
Number of pages	4
Journal	Physical review letters
Volume	76
Issue number	23
DOIs	https://doi.org/10.1103/PhysRevLett.76.4312
State	Published - 1996

ASJC Scopus subject areas

General Physics and Astronomy

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Gu, P., Haas, P., Hogan, W. P., Kim, S. K., Matthews, J. N., Myung, S. S., Schnetzer, S., Thomson, G. B., Zou, Y., Arisaka, K., Roberts, D., Slater, W., Spencer, M. B., Weaver, M., Briere, R. A., Cheu, E., Harris, D. A., Krolak, P., McFarland, K. S., ... Yamanaka, T. (1996). First evidence for the decay KL→e⁺e⁻μ⁺μ⁻. Physical review letters, 76(23), 4312-4315. https://doi.org/10.1103/PhysRevLett.76.4312

Gu, P, Haas, P, Hogan, WP, Kim, SK, Matthews, JN, Myung, SS, Schnetzer, S, Thomson, GB, Zou, Y, Arisaka, K, Roberts, D, Slater, W, Spencer, MB, Weaver, M, Briere, RA, Cheu, E, Harris, DA, Krolak, P, McFarland, KS, Roodman, A, Schwingenheuer, B, Somalwar, SV, Wah, YW, Winstein, B, Winston, R, Barker, AR, Swallow, EC, Bock, GJ, Coleman, R, Crisler, M, Enagonio, J, Ford, R, Hsiung, YB, Jensen, DA, O’Dell, VR, Ramberg, E, Tschirhart, R, Collins, EM, Gollin, GD, Nakaya, T & Yamanaka, T 1996, 'First evidence for the decay KL→e⁺e⁻μ⁺μ⁻', Physical review letters, vol. 76, no. 23, pp. 4312-4315. https://doi.org/10.1103/PhysRevLett.76.4312

@article{93bb18e20a6a45739ea2361cc958937b,

title = "First evidence for the decay KL→e+e−μ+μ−",

abstract = "We present the first evidence for the decay KL→e+e−μ+μ− based on the observation of one event with an estimated background of 0.067-0.025+0.057 event. We determine the branching ratio to be B(KL→e+e−μ+μ−)=(2.9-2.4+6.7)×10-9. In addition, we set a 90\% confidence upper limit on the combined branching ratio for the lepton flavor violating decays KL→e∓e∓μ±μ± to be B(KL→e∓e∓μ±μ±<)<6.1×10-9 assuming a uniform phase space distribution.",

author = "P. Gu and P. Haas and Hogan, \{W. P.\} and Kim, \{S. K.\} and Matthews, \{J. N.\} and Myung, \{S. S.\} and S. Schnetzer and Thomson, \{G. B.\} and Y. Zou and K. Arisaka and D. Roberts and W. Slater and Spencer, \{M. B.\} and M. Weaver and Briere, \{R. A.\} and E. Cheu and Harris, \{D. A.\} and P. Krolak and McFarland, \{K. S.\} and A. Roodman and B. Schwingenheuer and Somalwar, \{S. V.\} and Wah, \{Y. W.\} and B. Winstein and R. Winston and Barker, \{A. R.\} and Swallow, \{E. C.\} and Bock, \{G. J.\} and R. Coleman and M. Crisler and J. Enagonio and R. Ford and Hsiung, \{Y. B.\} and Jensen, \{D. A.\} and O{\textquoteright}Dell, \{V. R.\} and E. Ramberg and R. Tschirhart and Collins, \{E. M.\} and Gollin, \{G. D.\} and T. Nakaya and T. Yamanaka",

year = "1996",

doi = "10.1103/PhysRevLett.76.4312",

language = "English (US)",

volume = "76",

pages = "4312--4315",

journal = "Physical review letters",

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publisher = "American Physical Society",

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T1 - First evidence for the decay KL→e+e−μ+μ−

AU - Gu, P.

AU - Haas, P.

AU - Hogan, W. P.

AU - Kim, S. K.

AU - Matthews, J. N.

AU - Myung, S. S.

AU - Schnetzer, S.

AU - Thomson, G. B.

AU - Zou, Y.

AU - Arisaka, K.

AU - Roberts, D.

AU - Slater, W.

AU - Spencer, M. B.

AU - Weaver, M.

AU - Briere, R. A.

AU - Cheu, E.

AU - Harris, D. A.

AU - Krolak, P.

AU - McFarland, K. S.

AU - Roodman, A.

AU - Schwingenheuer, B.

AU - Somalwar, S. V.

AU - Wah, Y. W.

AU - Winstein, B.

AU - Winston, R.

AU - Barker, A. R.

AU - Swallow, E. C.

AU - Bock, G. J.

AU - Coleman, R.

AU - Crisler, M.

AU - Enagonio, J.

AU - Ford, R.

AU - Hsiung, Y. B.

AU - Jensen, D. A.

AU - O’Dell, V. R.

AU - Ramberg, E.

AU - Tschirhart, R.

AU - Collins, E. M.

AU - Gollin, G. D.

AU - Nakaya, T.

AU - Yamanaka, T.

PY - 1996

Y1 - 1996

N2 - We present the first evidence for the decay KL→e+e−μ+μ− based on the observation of one event with an estimated background of 0.067-0.025+0.057 event. We determine the branching ratio to be B(KL→e+e−μ+μ−)=(2.9-2.4+6.7)×10-9. In addition, we set a 90% confidence upper limit on the combined branching ratio for the lepton flavor violating decays KL→e∓e∓μ±μ± to be B(KL→e∓e∓μ±μ±<)<6.1×10-9 assuming a uniform phase space distribution.

AB - We present the first evidence for the decay KL→e+e−μ+μ− based on the observation of one event with an estimated background of 0.067-0.025+0.057 event. We determine the branching ratio to be B(KL→e+e−μ+μ−)=(2.9-2.4+6.7)×10-9. In addition, we set a 90% confidence upper limit on the combined branching ratio for the lepton flavor violating decays KL→e∓e∓μ±μ± to be B(KL→e∓e∓μ±μ±<)<6.1×10-9 assuming a uniform phase space distribution.

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