Measurement of the branching ratio of π0 Dalitz decay using KL→π0π0π0 decays

Autor:	Carlos Escobar, E. Blucher, E. T. Worcester, R. E. Ray, E. Abouzaid, J. Wang, A. R. Barker, B. Winstein, R. A. Gomes, H. Nguyen, Patricia McBride, R. Coleman, P. Gouffon, T. Yamanaka, Elliott Cheu, M. D. Corcoran, D. Smith, H. B. White, Alexandre Glazov, D. G. Phillips, E. Monnier, L. Bellantoni, R. F. Zukanovich, M. Ronquest, K. Kotera, Roland Winston, R. Niclasen, E. J. Ramberg, N. Solomey, Y. W. Wah, E. C. Swallow, E. D. Zimmerman, P. A. Toale, R. Tschirhart, Bradley Cox, G. J. Bock, E. M. Santos, Richard Kessler, Alexander Ledovskoy, M. J. Wilking, D. A. Jensen, Michael Wayne Arenton, W. E. Slater, Y. B. Hsiung, A. R. Erwin, A. Golossanov, J. Whitmore
Rok vydání:	2019
Předmět:	Physics Particle physics Pion 010308 nuclear & particles physics Branching fraction 0103 physical sciences Mass spectrum 010306 general physics 01 natural sciences Fermi Gamma-ray Space Telescope
Zdroj:	Physical Review D. 100
ISSN:	2470-0029 2470-0010
DOI:	10.1103/physrevd.100.032003
Popis:	We present a measurement of B(π0→e+e-γ)/B(π0→γγ), 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 KL→π0π0π0→γγγγe+e-γ decays. We normalize to KL→π0π0π0→6γ decays. We find B(π0→e+e-γ)/B(π0→γγ) (me+e->15 MeV/c2)=[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(π0→e+e-γ)/B(π0→γγ)=[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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::39a18e3a4458ae596af65a09eb8a2e9a https://doi.org/10.1103/physrevd.100.032003 Zobrazit plný text záznamu