Measurement of the branching ratio of $𝜋^0$ Dalitz decay using $𝐾_𝐿→𝜋^0⁢𝜋^0⁢𝜋^0$ decays

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.; Kotera, K.; Monnier, E.; Solomey, N.; Swallow, E. C.; Wah, Y. W.; Winstein, B.; Winston, R.; Worcester, E. T.

Measurement of the branching ratio of

$𝜋^0$ Dalitz decay using

$𝐾_𝐿→𝜋^0⁢𝜋^0⁢𝜋^0$ decays

2019

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Abstract

We present a measurement of

$𝐵⁡(𝜋^0→𝑒^+⁢𝑒^−⁢𝛾)/𝐵⁡(𝜋^0→𝛾⁢𝛾)$ , the Dalitz branching ratio, using data taken in 1999 by the E832 KTeV experiment at Fermi National Accelerator Laboratory. We use neutral pions from fully reconstructed 𝐾𝐿 decays in flight; the measurement is based on ∼60 thousand

$𝐾_𝐿→𝜋^0⁢𝜋^0⁢𝜋^0→𝛾⁢𝛾⁢𝛾⁢𝛾⁢𝑒^+⁢𝑒^−⁢𝛾$ decays. We normalize to

$𝐾_𝐿→𝜋^0⁢𝜋^0⁢𝜋^0→6⁢𝛾$ decays. We find

$𝐵⁡(𝜋^0→𝑒^+⁢𝑒^−⁢𝛾)/𝐵⁡(𝜋^0→𝛾⁢𝛾) (𝑚_{𝑒+⁢𝑒}−>15 MeV/𝑐^2)=[3.920±0.016⁢(stat)±0.036⁢(syst)]×10^{−3}$ . Using the Mikaelian and Smith prediction for the

$𝑒^+⁢𝑒^−$ mass spectrum, we correct the result to the full

$𝑒^+⁢𝑒^−$ mass range. The corrected result is

$𝐵⁡(𝜋^0→𝑒^+⁢𝑒^−⁢𝛾)/𝐵⁡(𝜋^0→𝛾⁢𝛾)=[1.1559±0.0047⁢(stat)±0.0106⁢(syst)]%$ . This result is consistent with previous measurements, and the uncertainty is a factor of 3 smaller than any previous measurement.

Details

Title

Measurement of the branching ratio of

$𝜋^0$ Dalitz decay using

$𝐾_𝐿→𝜋^0⁢𝜋^0⁢𝜋^0$ decays

Author

Abouzaid, E. : University of Chicago
Arenton, M. : University of Virginia
Barker, A. R. : University of Colorado
Bellantoni, L. : Fermi National Accelerator Laboratory
Blucher, E. : University of Chicago
Bock, G. J. : Fermi National Accelerator Laboratory
Cheu, E. : University of Arizona
Coleman, R. : Fermi National Accelerator Laboratory
Corcoran, M. D. : Rice University
Cox, B. : University of Virginia
Erwin, A. R. : University of Wisconsin
Escobar, C. O. : Universidade Estadual de Campinas
Glazov, A. : University of Chicago
Golossanov, A. : University of Virginia
Gomes, R. A. : Universidade Estadual de Campinas
Gouffon, P. : Universidade de São Paulo
Hsiung, Y. B. : Fermi National Accelerator Laboratory
Jensen, D. A. : Fermi National Accelerator Laboratory
Kessler, R. : University of Chicago
Kotera, K. : Osaka University
Monnier, E. : University of Chicago
Solomey, N. : University of Chicago
Swallow, E. C. : University of Chicago
Wah, Y. W. : University of Chicago
Winstein, B. : University of Chicago
Winston, R. : University of Chicago
Worcester, E. T. : University of Chicago

Content Type

Article

Published in

Physical Review D

Identifier(s)

DOI: https://doi.org/10.1103/PhysRevD.100.032003

Funding Information

U.S. Department of Energy
National Science Foundation
Ministry of Education and Science of Japan
Fundação de Amparo a Pesquisa do Estado de São Paulo-FAPESP
Conselho Nacional de Desenvolvimento Cientifico e Tecnologico-CNPq
CAPES-Ministerio Educação

Publication Date

2019-08-05

Language

English

Copyright Statement

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license.

Licensing

CC BY

Notes

Due to the large number of authors, only the first 20 and the University of Chicago authors are included on the above author list. Please download the article for the complete list of authors.

Record Appears in

Physical Sciences Division > Enrico Fermi Institute
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Record Created

2024-06-14

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