Measurement of the cp-violation parameter η+-γ in neutral kaon decays

E. J. Ramberg; G. J. Bock; R. Coleman; J. Enagonio; Y. B. Hsiung; K. Stanfield; R. Tschirhart; T. Yamanaka; E. C. Swallow; G. Blair; G. D. Gollin; M. Karlsson; J. K. Okamitsu; P. Debu; B. Peyaud; R. Turlay; B. Vallage

doi:10.1103/PhysRevLett.70.2529

Measurement of the cp-violation parameter η+-γ in neutral kaon decays

E. J. Ramberg, G. J. Bock, R. Coleman, J. Enagonio, Y. B. Hsiung, K. Stanfield, R. Tschirhart, T. Yamanaka, E. C. Swallow, G. Blair, G. D. Gollin, M. Karlsson, J. K. Okamitsu, P. Debu, B. Peyaud, R. Turlay, B. Vallage

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

Abstract

Interference between KS and KL decays into the final state π+π-γ has been observed in experiment 731 at Fermilab. By fitting the distribution of decays downstream of a regenerator, a new CP-violation parameterη+-γ, analogous to η+-, has been measured, with its magnitude equal to(2.15±0.26±0.20)×10-3, and φ+-γ, the associated phase angle, equal to(72±23±17)°. Assuming that any difference between this fit value for η+-γ and the previously measured value forη+- can be attributed to direct CP violation in this decay, a limit of|ε+-γ′|/ε<0.3 at the 90% confidence level has been made.

Original language	English (US)
Pages (from-to)	2529-2532
Number of pages	4
Journal	Physical review letters
Volume	70
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.70.2529
State	Published - 1993
Externally published	Yes

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Physics and Astronomy(all)

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10.1103/PhysRevLett.70.2529

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Ramberg, E. J., Bock, G. J., Coleman, R., Enagonio, J., Hsiung, Y. B., Stanfield, K., Tschirhart, R., Yamanaka, T., Swallow, E. C., Blair, G., Gollin, G. D., Karlsson, M., Okamitsu, J. K., Debu, P., Peyaud, B., Turlay, R., & Vallage, B. (1993). Measurement of the cp-violation parameter η+-γ in neutral kaon decays. Physical review letters, 70(17), 2529-2532. https://doi.org/10.1103/PhysRevLett.70.2529

Ramberg, EJ, Bock, GJ, Coleman, R, Enagonio, J, Hsiung, YB, Stanfield, K, Tschirhart, R, Yamanaka, T, Swallow, EC, Blair, G, Gollin, GD, Karlsson, M, Okamitsu, JK, Debu, P, Peyaud, B, Turlay, R & Vallage, B 1993, 'Measurement of the cp-violation parameter η+-γ in neutral kaon decays', Physical review letters, vol. 70, no. 17, pp. 2529-2532. https://doi.org/10.1103/PhysRevLett.70.2529

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title = "Measurement of the cp-violation parameter η+-γ in neutral kaon decays",

abstract = "Interference between KS and KL decays into the final state π+π-γ has been observed in experiment 731 at Fermilab. By fitting the distribution of decays downstream of a regenerator, a new CP-violation parameterη+-γ, analogous to η+-, has been measured, with its magnitude equal to(2.15±0.26±0.20)×10-3, and φ+-γ, the associated phase angle, equal to(72±23±17)°. Assuming that any difference between this fit value for η+-γ and the previously measured value forη+- can be attributed to direct CP violation in this decay, a limit of|ε+-γ′|/ε<0.3 at the 90% confidence level has been made.",

author = "Ramberg, {E. J.} and Bock, {G. J.} and R. Coleman and J. Enagonio and Hsiung, {Y. B.} and K. Stanfield and R. Tschirhart and T. Yamanaka and Swallow, {E. C.} and G. Blair and Gollin, {G. D.} and M. Karlsson and Okamitsu, {J. K.} and P. Debu and B. Peyaud and R. Turlay and B. Vallage",

year = "1993",

doi = "10.1103/PhysRevLett.70.2529",

language = "English (US)",

volume = "70",

pages = "2529--2532",

journal = "Physical review letters",

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T1 - Measurement of the cp-violation parameter η+-γ in neutral kaon decays

AU - Ramberg, E. J.

AU - Bock, G. J.

AU - Coleman, R.

AU - Enagonio, J.

AU - Hsiung, Y. B.

AU - Stanfield, K.

AU - Tschirhart, R.

AU - Yamanaka, T.

AU - Swallow, E. C.

AU - Blair, G.

AU - Gollin, G. D.

AU - Karlsson, M.

AU - Okamitsu, J. K.

AU - Debu, P.

AU - Peyaud, B.

AU - Turlay, R.

AU - Vallage, B.

PY - 1993

Y1 - 1993

N2 - Interference between KS and KL decays into the final state π+π-γ has been observed in experiment 731 at Fermilab. By fitting the distribution of decays downstream of a regenerator, a new CP-violation parameterη+-γ, analogous to η+-, has been measured, with its magnitude equal to(2.15±0.26±0.20)×10-3, and φ+-γ, the associated phase angle, equal to(72±23±17)°. Assuming that any difference between this fit value for η+-γ and the previously measured value forη+- can be attributed to direct CP violation in this decay, a limit of|ε+-γ′|/ε<0.3 at the 90% confidence level has been made.

AB - Interference between KS and KL decays into the final state π+π-γ has been observed in experiment 731 at Fermilab. By fitting the distribution of decays downstream of a regenerator, a new CP-violation parameterη+-γ, analogous to η+-, has been measured, with its magnitude equal to(2.15±0.26±0.20)×10-3, and φ+-γ, the associated phase angle, equal to(72±23±17)°. Assuming that any difference between this fit value for η+-γ and the previously measured value forη+- can be attributed to direct CP violation in this decay, a limit of|ε+-γ′|/ε<0.3 at the 90% confidence level has been made.

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JO - Physical review letters

JF - Physical review letters

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Measurement of the cp-violation parameter η+-γ in neutral kaon decays

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