Measurement of the rare decay π0→e+e-

E. Abouzaid, M. Arenton, A. R. Barker, L. Bellantoni, A. Bellavance, E. Blucher, G. J. Bock, Elliott C Cheu, R. Coleman, M. D. Corcoran, B. Cox, A. R. Erwin, C. O. Escobar, A. Glazov, A. Golossanov, R. A. Gomes, P. Gouffon, K. Hanagaki, Y. B. Hsiung, H. HuangD. 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, X. R. Qi, E. J. Ramberg, R. E. Ray, M. Ronquest, E. Santos, J. Shields, 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

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Abstract

The branching ratio of the rare decay π0→e+e- has been measured precisely, using the complete data set from the KTeV E799-II experiment at Fermilab. We observe 794 candidate π0→e+e- events using KL→3π0 as a source of tagged π0s. The expected background is 52.7±11.2 events, predominantly from high e+e- mass π0→e+e-γ decays. We have measured B(π0→e+e-,(me+e-/mπ0)2>0.95)=(6.44±0. 25stat±0.22syst)×10-8, which is above the unitary bound from π0→γγ and within the range of theoretical expectations from the standard model.

Original languageEnglish (US)
Article number012004
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume75
Issue number1
DOIs
StatePublished - 2007

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Decay
decay
Branching
Standard Model
Range of data
Experiment
Background

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Mathematical Physics

Cite this

Abouzaid, E., Arenton, M., Barker, A. R., Bellantoni, L., Bellavance, A., Blucher, E., ... Zukanovich, R. F. (2007). Measurement of the rare decay π0→e+e-. Physical Review D - Particles, Fields, Gravitation and Cosmology, 75(1), [012004]. https://doi.org/10.1103/PhysRevD.75.012004

Measurement of the rare decay π0→e+e-. / Abouzaid, E.; Arenton, M.; Barker, A. R.; Bellantoni, L.; Bellavance, A.; Blucher, E.; Bock, G. J.; Cheu, Elliott C; Coleman, R.; Corcoran, M. D.; Cox, B.; Erwin, A. R.; Escobar, C. O.; Glazov, A.; Golossanov, A.; Gomes, R. A.; Gouffon, P.; Hanagaki, K.; Hsiung, Y. B.; Huang, H.; Jensen, D. A.; Kessler, R.; Kotera, K.; Ledovskoy, A.; McBride, P. L.; Monnier, E.; Nelson, K. S.; Nguyen, H.; Niclasen, R.; Phillips, D. G.; Ping, H.; Qi, X. R.; Ramberg, E. J.; Ray, R. E.; Ronquest, M.; Santos, E.; Shields, J.; Slater, W.; Smith, D.; Solomey, N.; Swallow, E. C.; Toale, P. A.; Tschirhart, R.; Velissaris, C.; Wah, Y. W.; Wang, J.; White, H. B.; Whitmore, J.; Wilking, M. J.; Winstein, B.; Winston, R.; Worcester, E. T.; Worcester, M.; Yamanaka, T.; Zimmerman, E. D.; Zukanovich, R. F.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 75, No. 1, 012004, 2007.

Research output: Contribution to journalArticle

Abouzaid, E, Arenton, M, Barker, AR, Bellantoni, L, Bellavance, A, Blucher, E, Bock, GJ, Cheu, EC, Coleman, R, Corcoran, MD, Cox, B, Erwin, AR, Escobar, CO, Glazov, A, Golossanov, A, Gomes, RA, Gouffon, P, Hanagaki, K, Hsiung, YB, Huang, H, Jensen, DA, Kessler, R, Kotera, K, Ledovskoy, A, McBride, PL, Monnier, E, Nelson, KS, Nguyen, H, Niclasen, R, Phillips, DG, Ping, H, Qi, XR, Ramberg, EJ, Ray, RE, Ronquest, M, Santos, E, Shields, J, 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, 'Measurement of the rare decay π0→e+e-', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 75, no. 1, 012004. https://doi.org/10.1103/PhysRevD.75.012004
Abouzaid E, Arenton M, Barker AR, Bellantoni L, Bellavance A, Blucher E et al. Measurement of the rare decay π0→e+e-. Physical Review D - Particles, Fields, Gravitation and Cosmology. 2007;75(1). 012004. https://doi.org/10.1103/PhysRevD.75.012004
Abouzaid, E. ; Arenton, M. ; Barker, A. R. ; Bellantoni, L. ; Bellavance, A. ; Blucher, E. ; Bock, G. J. ; Cheu, Elliott C ; Coleman, R. ; Corcoran, M. D. ; Cox, B. ; Erwin, A. R. ; Escobar, C. O. ; Glazov, A. ; Golossanov, A. ; Gomes, R. A. ; Gouffon, P. ; Hanagaki, K. ; Hsiung, Y. B. ; Huang, H. ; Jensen, D. A. ; Kessler, R. ; Kotera, K. ; Ledovskoy, A. ; McBride, P. L. ; Monnier, E. ; Nelson, K. S. ; Nguyen, H. ; Niclasen, R. ; Phillips, D. G. ; Ping, H. ; Qi, X. R. ; Ramberg, E. J. ; Ray, R. E. ; Ronquest, M. ; Santos, E. ; Shields, J. ; Slater, W. ; Smith, D. ; Solomey, N. ; Swallow, E. C. ; Toale, P. A. ; Tschirhart, R. ; Velissaris, C. ; Wah, Y. W. ; Wang, J. ; White, H. B. ; Whitmore, J. ; Wilking, M. J. ; Winstein, B. ; Winston, R. ; Worcester, E. T. ; Worcester, M. ; Yamanaka, T. ; Zimmerman, E. D. ; Zukanovich, R. F. / Measurement of the rare decay π0→e+e-. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2007 ; Vol. 75, No. 1.
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abstract = "The branching ratio of the rare decay π0→e+e- has been measured precisely, using the complete data set from the KTeV E799-II experiment at Fermilab. We observe 794 candidate π0→e+e- events using KL→3π0 as a source of tagged π0s. The expected background is 52.7±11.2 events, predominantly from high e+e- mass π0→e+e-γ decays. We have measured B(π0→e+e-,(me+e-/mπ0)2>0.95)=(6.44±0. 25stat±0.22syst)×10-8, which is above the unitary bound from π0→γγ and within the range of theoretical expectations from the standard model.",
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T1 - Measurement of the rare decay π0→e+e-

AU - Abouzaid, E.

AU - Arenton, M.

AU - Barker, A. R.

AU - Bellantoni, L.

AU - Bellavance, A.

AU - Blucher, E.

AU - Bock, G. J.

AU - Cheu, Elliott C

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 - Hanagaki, K.

AU - Hsiung, Y. B.

AU - Huang, H.

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 - Qi, X. R.

AU - Ramberg, E. J.

AU - Ray, R. E.

AU - Ronquest, M.

AU - Santos, E.

AU - Shields, J.

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

Y1 - 2007

N2 - The branching ratio of the rare decay π0→e+e- has been measured precisely, using the complete data set from the KTeV E799-II experiment at Fermilab. We observe 794 candidate π0→e+e- events using KL→3π0 as a source of tagged π0s. The expected background is 52.7±11.2 events, predominantly from high e+e- mass π0→e+e-γ decays. We have measured B(π0→e+e-,(me+e-/mπ0)2>0.95)=(6.44±0. 25stat±0.22syst)×10-8, which is above the unitary bound from π0→γγ and within the range of theoretical expectations from the standard model.

AB - The branching ratio of the rare decay π0→e+e- has been measured precisely, using the complete data set from the KTeV E799-II experiment at Fermilab. We observe 794 candidate π0→e+e- events using KL→3π0 as a source of tagged π0s. The expected background is 52.7±11.2 events, predominantly from high e+e- mass π0→e+e-γ decays. We have measured B(π0→e+e-,(me+e-/mπ0)2>0.95)=(6.44±0. 25stat±0.22syst)×10-8, which is above the unitary bound from π0→γγ and within the range of theoretical expectations from the standard model.

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JF - Physical review D: Particles and fields

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