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Measurement of the branching ratio of the double Dalitz decayK L →e+ee+e and the CP parity of theK L -meson

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Zeitschrift für Physik C Particles and Fields

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.

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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

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Barr, G.D., Buchholz, P., Cundy, D. et al. Measurement of the branching ratio of the double Dalitz decayK L →e+ee+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

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  • DOI: https://doi.org/10.1007/BF01556126

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