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; 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; 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

doi:10.1103/PhysRevLett.100.182001

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, 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, 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

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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 language	English (US)
Article number	182001
Journal	Physical review letters
Volume	100
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevLett.100.182001
State	Published - May 6 2008
Externally published	Yes

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10.1103/PhysRevLett.100.182001

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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. (2008). Determination of the parity of the neutral pion via its four-electron decay. Physical review letters, 100(18), Article 182001. https://doi.org/10.1103/PhysRevLett.100.182001

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, 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

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title = "Determination of the parity of the neutral pion via its four-electron decay",

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.",

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 H. Nguyen and R. Niclasen and Phillips, {D. G.} 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 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 T. Yamanaka and Zimmerman, {E. D.} and Zukanovich, {R. F.}",

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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, 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 - 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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DO - 10.1103/PhysRevLett.100.182001

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VL - 100

JO - Physical review letters

JF - Physical review letters

IS - 18

M1 - 182001

ER -

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

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