Published August 5, 2019
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Measurement of the branching ratio of $π^0$ Dalitz decay using $πΎ_πΏβπ^0β’π^0β’π^0$ decays
Creators
- Abouzaid, E.1
- Arenton, M.2
- Barker, A. R.3
- Bellantoni, L.4
- Blucher, E.1
- Bock, G. J.4
- Cheu, E.5
- Coleman, R.4
- Corcoran, M. D.6
- Cox, B.2
- Erwin, A. R.7
- Escobar, C. O.8
- Glazov, A.1
- Golossanov, A.2
- Gomes, R. A.8
- Gouffon, P.9
- Hsiung, Y. B.4
- Jensen, D. A.4
- Kessler, R.1
- Kotera, K.10
- Monnier, E.1
- Solomey, N.1
- Swallow, E. C.1
- Wah, Y. W.1
- Winstein, B.1
- Winston, R.1
- Worcester, E. T.1
- 1. University of Chicago
- 2. University of Virginia
- 3. University of Colorado
- 4. Fermi National Accelerator Laboratory
- 5. University of Arizona
- 6. Rice University
- 7. University of Wisconsin
- 8. Universidade Estadual de Campinas
- 9. Universidade de SΓ£o Paulo
- 10. Osaka University
Description
We present a measurement of $π΅β‘(π^0βπ^+β’π^ββ’πΎ)/π΅β‘(π^0βπΎβ’πΎ)$, 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 πΎπΏ decays in flight; the measurement is based on βΌ60 thousand $πΎ_πΏβπ^0β’π^0β’π^0βπΎβ’πΎβ’πΎβ’πΎβ’π^+β’π^ββ’πΎ$ decays. We normalize to $πΎ_πΏβπ^0β’π^0β’π^0β6β’πΎ$ decays. We find $π΅β‘(π^0βπ^+β’π^ββ’πΎ)/π΅β‘(π^0βπΎβ’πΎ) (π_{π+β’π}β>15ββMeV/π^2)=[3.920Β±0.016β’(stat)Β±0.036β’(syst)]Γ10^{β3}$. Using the Mikaelian and Smith prediction for the $π^+β’π^β$ mass spectrum, we correct the result to the full $π^+β’π^β$ mass range. The corrected result is $π΅β‘(π^0βπ^+β’π^ββ’πΎ)/π΅β‘(π^0βπΎβ’πΎ)=[1.1559Β±0.0047β’(stat)Β±0.0106β’(syst)]%$. This result is consistent with previous measurements, and the uncertainty is a factor of 3 smaller than any previous measurement.
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.
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Additional details
Identifiers
- DOI
- 10.1103/PhysRevD.100.032003
- Other
- oai:uchicago.tind.io:12626
Funding
- 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-Fundação de Amparo à Pesquisa do Estado de São Paulo
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico-National Council for Scientific and Technological Development
- CAPES-Ministerio Educação