Determination of the parity of the neutral pion via its four-electron decay

E. Abouzaid, M. Arenton, A. R. Barker, L. Bellantoni, 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, Y. B. Hsiung, D. A. Jensen, R. Kessler, K. KoteraA. Ledovskoy, P. L. McBride, E. Monnier, H. Nguyen, R. Niclasen, D. G. Phillips, E. J. Ramberg, R. E. Ray, M. Ronquest, E. Santos, W. Slater, D. Smith, N. Solomey, E. C. Swallow, P. A. Toale, R. Tschirhart, Y. W. Wah, J. Wang, H. B. White, J. Whitmore, M. J. Wilking, B. Winstein, R. Winston, E. T. Worcester, T. Yamanaka, E. D. Zimmerman, R. F. Zukanovich

Research output: Contribution to journalArticle

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Abstract

We present a new determination of the parity of the neutral pion via the double Dalitz decay π0→e+e-e+e-. Our sample, which consists of 30511 candidate decays, was collected from KL→π0π0π0 decays in flight at the KTeV-E799 experiment at Fermi National Accelerator Laboratory. We confirm the negative π0 parity and place a limit on scalar contributions to the π0→e+e-e+e- decay amplitude of less than 3.3% assuming CPT conservation. The π0γ*γ* form factor is well described by a momentum-dependent model with a slope parameter fit to the final state phase-space distribution. Additionally, we have measured the branching ratio of this mode to be B(π0→e+e-e+e-)=(3.26±0.18)×10-5.

Original languageEnglish (US)
Article number182001
JournalPhysical Review Letters
Volume100
Issue number18
DOIs
StatePublished - May 6 2008

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parity
pions
decay
electrons
form factors
conservation
accelerators
flight
slopes
scalars
momentum

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Abouzaid, E., Arenton, M., Barker, A. R., Bellantoni, L., Blucher, E., Bock, G. J., ... Zukanovich, R. F. (2008). Determination of the parity of the neutral pion via its four-electron decay. Physical Review Letters, 100(18), [182001]. https://doi.org/10.1103/PhysRevLett.100.182001

Determination of the parity of the neutral pion via its four-electron decay. / Abouzaid, E.; Arenton, M.; Barker, A. R.; Bellantoni, L.; 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.; Hsiung, Y. B.; Jensen, D. A.; Kessler, R.; Kotera, K.; Ledovskoy, A.; McBride, P. L.; Monnier, E.; Nguyen, H.; Niclasen, R.; Phillips, D. G.; Ramberg, E. J.; Ray, R. E.; Ronquest, M.; Santos, E.; Slater, W.; Smith, D.; Solomey, N.; Swallow, E. C.; Toale, P. A.; Tschirhart, R.; Wah, Y. W.; Wang, J.; White, H. B.; Whitmore, J.; Wilking, M. J.; Winstein, B.; Winston, R.; Worcester, E. T.; Yamanaka, T.; Zimmerman, E. D.; Zukanovich, R. F.

In: Physical Review Letters, Vol. 100, No. 18, 182001, 06.05.2008.

Research output: Contribution to journalArticle

Abouzaid, E, Arenton, M, Barker, AR, Bellantoni, L, Blucher, E, Bock, GJ, Cheu, EC, 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, Nguyen, H, Niclasen, R, Phillips, DG, Ramberg, EJ, Ray, RE, Ronquest, M, Santos, E, Slater, W, Smith, D, Solomey, N, Swallow, EC, Toale, PA, Tschirhart, R, Wah, YW, Wang, J, White, HB, Whitmore, J, Wilking, MJ, Winstein, B, Winston, R, Worcester, ET, Yamanaka, T, Zimmerman, ED & Zukanovich, RF 2008, 'Determination of the parity of the neutral pion via its four-electron decay', Physical Review Letters, vol. 100, no. 18, 182001. https://doi.org/10.1103/PhysRevLett.100.182001
Abouzaid E, Arenton M, Barker AR, Bellantoni L, Blucher E, Bock GJ et al. Determination of the parity of the neutral pion via its four-electron decay. Physical Review Letters. 2008 May 6;100(18). 182001. https://doi.org/10.1103/PhysRevLett.100.182001
Abouzaid, E. ; Arenton, M. ; Barker, A. R. ; Bellantoni, L. ; 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. ; Hsiung, Y. B. ; Jensen, D. A. ; Kessler, R. ; Kotera, K. ; Ledovskoy, A. ; McBride, P. L. ; Monnier, E. ; Nguyen, H. ; Niclasen, R. ; Phillips, D. G. ; Ramberg, E. J. ; Ray, R. E. ; Ronquest, M. ; Santos, E. ; Slater, W. ; Smith, D. ; Solomey, N. ; Swallow, E. C. ; Toale, P. A. ; Tschirhart, R. ; Wah, Y. W. ; Wang, J. ; White, H. B. ; Whitmore, J. ; Wilking, M. J. ; Winstein, B. ; Winston, R. ; Worcester, E. T. ; Yamanaka, T. ; Zimmerman, E. D. ; Zukanovich, R. F. / Determination of the parity of the neutral pion via its four-electron decay. In: Physical Review Letters. 2008 ; Vol. 100, No. 18.
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abstract = "We present a new determination of the parity of the neutral pion via the double Dalitz decay π0→e+e-e+e-. Our sample, which consists of 30511 candidate decays, was collected from KL→π0π0π0 decays in flight at the KTeV-E799 experiment at Fermi National Accelerator Laboratory. We confirm the negative π0 parity and place a limit on scalar contributions to the π0→e+e-e+e- decay amplitude of less than 3.3{\%} assuming CPT conservation. The π0γ*γ* form factor is well described by a momentum-dependent model with a slope parameter fit to the final state phase-space distribution. Additionally, we have measured the branching ratio of this mode to be B(π0→e+e-e+e-)=(3.26±0.18)×10-5.",
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T1 - Determination of the parity of the neutral pion via its four-electron decay

AU - Abouzaid, E.

AU - Arenton, M.

AU - Barker, A. R.

AU - Bellantoni, L.

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 - Hsiung, Y. B.

AU - Jensen, D. A.

AU - Kessler, R.

AU - Kotera, K.

AU - Ledovskoy, A.

AU - McBride, P. L.

AU - Monnier, E.

AU - Nguyen, H.

AU - Niclasen, R.

AU - Phillips, D. G.

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 - 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 - Yamanaka, T.

AU - Zimmerman, E. D.

AU - Zukanovich, R. F.

PY - 2008/5/6

Y1 - 2008/5/6

N2 - We present a new determination of the parity of the neutral pion via the double Dalitz decay π0→e+e-e+e-. Our sample, which consists of 30511 candidate decays, was collected from KL→π0π0π0 decays in flight at the KTeV-E799 experiment at Fermi National Accelerator Laboratory. We confirm the negative π0 parity and place a limit on scalar contributions to the π0→e+e-e+e- decay amplitude of less than 3.3% assuming CPT conservation. The π0γ*γ* form factor is well described by a momentum-dependent model with a slope parameter fit to the final state phase-space distribution. Additionally, we have measured the branching ratio of this mode to be B(π0→e+e-e+e-)=(3.26±0.18)×10-5.

AB - We present a new determination of the parity of the neutral pion via the double Dalitz decay π0→e+e-e+e-. Our sample, which consists of 30511 candidate decays, was collected from KL→π0π0π0 decays in flight at the KTeV-E799 experiment at Fermi National Accelerator Laboratory. We confirm the negative π0 parity and place a limit on scalar contributions to the π0→e+e-e+e- decay amplitude of less than 3.3% assuming CPT conservation. The π0γ*γ* form factor is well described by a momentum-dependent model with a slope parameter fit to the final state phase-space distribution. Additionally, we have measured the branching ratio of this mode to be B(π0→e+e-e+e-)=(3.26±0.18)×10-5.

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