Abstract
Data from the NA31 experiment at CERN have been used to measure the branching ratio of the double Dalitz decay of the long-lived neutral kaon. Eight events have been found with negligible background. The measured distribution of the angle between the planes of the two e+e−-pairs favours aCP=−1 state for the long-lived neutral kaon.
Similar content being viewed by others
References
C.N. Yang: Phys. Rev. 77 (1950) 242
R. Plano et al.: Phys. Rev. Lett. 3 (1959) 525; N.P. Samios et al.: Phys. Rev. 126 (1962) 1844
G.D. Barr et al.: Phys. Lett. B 259 (1991) 389
G.D. Barr et al.: Phys. Lett. B 240 (1990) 283
K.E. Ohl et al.: Phys. Rev. Lett. 65 (1990) 1407
M.A. Shifman et al.: Nucl. Phys. B 120 (1977) 316
L. Bergström et al.: Phys. Lett. B 131 (1983) 229
L. Bergström et al.: Phys. Lett. B 249 (1990) 141
H. Burkhardt et al.: Nucl. Instr. Methods A 268 (1988) 116
G.D. Barr et al.: Nucl. Instr. Methods A 294 (1990) 465
N.M. Kroll, W. Wada: Phys. Rev. 98 (1955) 1355
T. Miyazaki, E. Takasugi: Phys. Rev. D 8 (1973) 2051
H. Rohrer: “Messung der Rate desK L -Dalitzzerfalls und erste Beobachtung eines Formfaktors in diesem Zerfall”, Ph.D.thesis, Universität Mainz, 1992 (unpublished); see also ref. [4]
M.R. Vagins et al.: Phys. Rev. Lett. 71 (1993) 35
T. Akagi et al.: Phys. Rev. D47 (1993) R 2644
P. Gu et al.: Phys. Rev. Lett. 72 (1994) 3000
Author information
Authors and Affiliations
Additional information
On leave from SLAC, Stanford, CA 94309, USA
Funded by the German Federal Minister for Research and Technology (BMFT) under contract 054MZ18
Funded by Institut National de Physique des Particules et de Physique Nucléaire (IN2P3), France
Funded by the German Federal Minister for Research and Technology (BMFT) under contract 054SI74
Rights and permissions
About this article
Cite this article
Barr, G.D., Buchholz, P., Cundy, D. et al. Measurement of the branching ratio of the double Dalitz decayK L →e+e−e+e− and the CP parity of theK L -meson. Z. Phys. C - Particles and Fields 65, 361–365 (1995). https://doi.org/10.1007/BF01556126
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01556126