Measurement of the rare decay π0→e+e-

E. Abouzaid; M. Arenton; A. R. Barker; L. Bellantoni; A. Bellavance; 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; K. Hanagaki; Y. B. Hsiung; H. Huang; 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; 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

doi:10.1103/PhysRevD.75.012004

Measurement of the rare decay π0→e+e-

E. Abouzaid, M. Arenton, A. R. Barker, L. Bellantoni, A. Bellavance, 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, 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

Physics

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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 language	English (US)
Article number	012004
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	75
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevD.75.012004
State	Published - 2007

ASJC Scopus subject areas

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

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10.1103/PhysRevD.75.012004

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

Abouzaid, E, Arenton, M, Barker, AR, Bellantoni, L, Bellavance, A, Blucher, E, Bock, GJ, Cheu, E, 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

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title = "Measurement of the rare decay π0→e+e-",

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.",

author = "E. Abouzaid and M. Arenton and Barker, {A. R.} and L. Bellantoni and A. Bellavance 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 K. Hanagaki and Hsiung, {Y. B.} and H. Huang 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 Qi, {X. R.} and Ramberg, {E. J.} and Ray, {R. E.} and M. Ronquest and E. Santos and J. Shields 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",

doi = "10.1103/PhysRevD.75.012004",

language = "English (US)",

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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, 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 - 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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U2 - 10.1103/PhysRevD.75.012004

DO - 10.1103/PhysRevD.75.012004

M3 - Article

AN - SCOPUS:33846437103

SN - 1550-7998

VL - 75

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

IS - 1

M1 - 012004

ER -

Measurement of the rare decay π0→e+e-

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