First observation of KL→π±eνe+e-

E. Abouzaid; M. Arenton; A. R. Barker; L. Bellantoni; E. Blucher; G. J. Bock; E. Cheu; R. Coleman; M. D. Corcoran; B. Cox; A. R. Erwin; C. O. Escobar; A. Glazov; A. Golossanov; R. A. Gomes; P. Gouffon; Y. B. Hsiung; D. A. Jensen; R. Kessler; K. Kotera; A. Ledovskoy; P. L. McBride; E. Monnier; K. S. Nelson; H. Nguyen; R. Niclasen; D. G. Phillips; H. Ping; E. J. Ramberg; R. E. Ray; M. Ronquest; E. Santos; W. Slater; D. Smith; N. Solomey; E. C. Swallow; P. A. Toale; R. Tschirhart; C. Velissaris; Y. W. Wah; J. Wang; H. B. White; J. Whitmore; M. J. Wilking; B. Winstein; R. Winston; E. T. Worcester; M. Worcester; T. Yamanaka; E. D. Zimmerman; R. F. Zukanovich

doi:10.1103/PhysRevLett.99.081803

First observation of KL→π±eνe+e-

E. Abouzaid, M. Arenton, A. R. Barker, L. Bellantoni, E. Blucher, G. J. Bock, E. Cheu, R. Coleman, M. D. Corcoran, B. Cox, A. R. Erwin, C. O. Escobar, A. Glazov, A. Golossanov, R. A. Gomes, P. Gouffon, Y. B. Hsiung, D. A. Jensen, R. Kessler, K. KoteraA. Ledovskoy, P. L. McBride, E. Monnier, K. S. Nelson, H. Nguyen, R. Niclasen, D. G. Phillips, H. Ping, E. J. Ramberg, R. E. Ray, M. Ronquest, E. Santos, W. Slater, D. Smith, N. Solomey, E. C. Swallow, P. A. Toale, R. Tschirhart, C. Velissaris, Y. W. Wah, J. Wang, H. B. White, J. Whitmore, M. J. Wilking, B. Winstein, R. Winston, E. T. Worcester, M. Worcester, T. Yamanaka, E. D. Zimmerman, R. F. Zukanovich

Physics

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Abstract

This Letter is the first report of the KL→π±eνe+e- decay. Based on 19208±144 events, we determine the branching fraction, B(KL→π±eνe+e-;Me+e->5MeV/c2,Ee+e-*>30MeV)=(1. 285±0.041)×10-5, and Γ(Ke3ee;Me+e->5MeV/c2)/Γ(Ke3)= [4.57±0.04(stat)±0.14(syst)]×10-5. This ratio agrees with a theoretical prediction based on chiral perturbation theory (ChPT) calculated to O(p4). The measured kinematical distributions agree with those predicted by just ChPT O(p4), but show significant disagreement with ones predicted by leading-order ChPT.

Original language	English (US)
Article number	081803
Journal	Physical review letters
Volume	99
Issue number	8
DOIs	https://doi.org/10.1103/PhysRevLett.99.081803
State	Published - Aug 25 2007

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.99.081803

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Abouzaid, E., Arenton, M., Barker, A. R., Bellantoni, L., Blucher, E., Bock, G. J., Cheu, E., Coleman, R., Corcoran, M. D., Cox, B., Erwin, A. R., Escobar, C. O., Glazov, A., Golossanov, A., Gomes, R. A., Gouffon, P., Hsiung, Y. B., Jensen, D. A., Kessler, R., ... Zukanovich, R. F. (2007). First observation of KL→π±eνe+e-. Physical review letters, 99(8), Article 081803. https://doi.org/10.1103/PhysRevLett.99.081803

Abouzaid, E, Arenton, M, Barker, AR, Bellantoni, L, Blucher, E, Bock, GJ, Cheu, E, Coleman, R, Corcoran, MD, Cox, B, Erwin, AR, Escobar, CO, Glazov, A, Golossanov, A, Gomes, RA, Gouffon, P, Hsiung, YB, Jensen, DA, Kessler, R, Kotera, K, Ledovskoy, A, McBride, PL, Monnier, E, Nelson, KS, Nguyen, H, Niclasen, R, Phillips, DG, Ping, H, Ramberg, EJ, Ray, RE, Ronquest, M, Santos, E, Slater, W, Smith, D, Solomey, N, Swallow, EC, Toale, PA, Tschirhart, R, Velissaris, C, Wah, YW, Wang, J, White, HB, Whitmore, J, Wilking, MJ, Winstein, B, Winston, R, Worcester, ET, Worcester, M, Yamanaka, T, Zimmerman, ED & Zukanovich, RF 2007, 'First observation of KL→π±eνe+e-', Physical review letters, vol. 99, no. 8, 081803. https://doi.org/10.1103/PhysRevLett.99.081803

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title = "First observation of KL→π±eνe+e-",

abstract = "This Letter is the first report of the KL→π±eνe+e- decay. Based on 19208±144 events, we determine the branching fraction, B(KL→π±eνe+e-;Me+e->5MeV/c2,Ee+e-*>30MeV)=(1. 285±0.041)×10-5, and Γ(Ke3ee;Me+e->5MeV/c2)/Γ(Ke3)= [4.57±0.04(stat)±0.14(syst)]×10-5. This ratio agrees with a theoretical prediction based on chiral perturbation theory (ChPT) calculated to O(p4). The measured kinematical distributions agree with those predicted by just ChPT O(p4), but show significant disagreement with ones predicted by leading-order ChPT.",

author = "E. Abouzaid and M. Arenton and Barker, {A. R.} and L. Bellantoni and E. Blucher and Bock, {G. J.} and E. Cheu and R. Coleman and Corcoran, {M. D.} and B. Cox and Erwin, {A. R.} and Escobar, {C. O.} and A. Glazov and A. Golossanov and Gomes, {R. A.} and P. Gouffon and Hsiung, {Y. B.} and Jensen, {D. A.} and R. Kessler and K. Kotera and A. Ledovskoy and McBride, {P. L.} and E. Monnier and Nelson, {K. S.} and H. Nguyen and R. Niclasen and Phillips, {D. G.} and H. Ping and Ramberg, {E. J.} and Ray, {R. E.} and M. Ronquest and E. Santos and W. Slater and D. Smith and N. Solomey and Swallow, {E. C.} and Toale, {P. A.} and R. Tschirhart and C. Velissaris and Wah, {Y. W.} and J. Wang and White, {H. B.} and J. Whitmore and Wilking, {M. J.} and B. Winstein and R. Winston and Worcester, {E. T.} and M. Worcester and T. Yamanaka and Zimmerman, {E. D.} and Zukanovich, {R. F.}",

year = "2007",

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day = "25",

doi = "10.1103/PhysRevLett.99.081803",

language = "English (US)",

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T1 - First observation of KL→π±eνe+e-

AU - Abouzaid, E.

AU - Arenton, M.

AU - Barker, A. R.

AU - Bellantoni, L.

AU - Blucher, E.

AU - Bock, G. J.

AU - Cheu, E.

AU - Coleman, R.

AU - Corcoran, M. D.

AU - Cox, B.

AU - Erwin, A. R.

AU - Escobar, C. O.

AU - Glazov, A.

AU - Golossanov, A.

AU - Gomes, R. A.

AU - Gouffon, P.

AU - Hsiung, Y. B.

AU - Jensen, D. A.

AU - Kessler, R.

AU - Kotera, K.

AU - Ledovskoy, A.

AU - McBride, P. L.

AU - Monnier, E.

AU - Nelson, K. S.

AU - Nguyen, H.

AU - Niclasen, R.

AU - Phillips, D. G.

AU - Ping, H.

AU - Ramberg, E. J.

AU - Ray, R. E.

AU - Ronquest, M.

AU - Santos, E.

AU - Slater, W.

AU - Smith, D.

AU - Solomey, N.

AU - Swallow, E. C.

AU - Toale, P. A.

AU - Tschirhart, R.

AU - Velissaris, C.

AU - Wah, Y. W.

AU - Wang, J.

AU - White, H. B.

AU - Whitmore, J.

AU - Wilking, M. J.

AU - Winstein, B.

AU - Winston, R.

AU - Worcester, E. T.

AU - Worcester, M.

AU - Yamanaka, T.

AU - Zimmerman, E. D.

AU - Zukanovich, R. F.

PY - 2007/8/25

Y1 - 2007/8/25

N2 - This Letter is the first report of the KL→π±eνe+e- decay. Based on 19208±144 events, we determine the branching fraction, B(KL→π±eνe+e-;Me+e->5MeV/c2,Ee+e-*>30MeV)=(1. 285±0.041)×10-5, and Γ(Ke3ee;Me+e->5MeV/c2)/Γ(Ke3)= [4.57±0.04(stat)±0.14(syst)]×10-5. This ratio agrees with a theoretical prediction based on chiral perturbation theory (ChPT) calculated to O(p4). The measured kinematical distributions agree with those predicted by just ChPT O(p4), but show significant disagreement with ones predicted by leading-order ChPT.

AB - This Letter is the first report of the KL→π±eνe+e- decay. Based on 19208±144 events, we determine the branching fraction, B(KL→π±eνe+e-;Me+e->5MeV/c2,Ee+e-*>30MeV)=(1. 285±0.041)×10-5, and Γ(Ke3ee;Me+e->5MeV/c2)/Γ(Ke3)= [4.57±0.04(stat)±0.14(syst)]×10-5. This ratio agrees with a theoretical prediction based on chiral perturbation theory (ChPT) calculated to O(p4). The measured kinematical distributions agree with those predicted by just ChPT O(p4), but show significant disagreement with ones predicted by leading-order ChPT.

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DO - 10.1103/PhysRevLett.99.081803

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VL - 99

JO - Physical review letters

JF - Physical review letters

IS - 8

M1 - 081803

ER -

First observation of KL→π±eνe+e-

Abstract

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