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Measurement of the branching ratio of the double Dalitz decayK L →e+e−e+e− and the CP parity of theK L -meson |
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| Authors: | G. D. Barr P. Buchholz D. Cundy N. Doble L. Gatignon P. Grafström R. Hagelberg H. Wahl K. J. Peach T. Beier H. Blümer D. Coward R. Heinz K. Kleinknecht F. Leber P. Mayer B. Renk H. Rohrer H. G. Sander J. Scheidt J. Staeck A. Wagner E. Augé D. Fournier L. Iconomidou-Fayard O. Perdereau A. C. Schaffer L. Serin L. Bertanza P. Calafiura M. Calvetti R. Carosi R. Casali C. Cerri I. Mannelli V. M. Marzulli A. Nappi G. M. Pierazzini M. Holder A. Kreutz M. Rost R. Werthenbach |
| Affiliation: | 1. CERN, CH-1211, Geneva 23, Switzerland 2. Physics Department, University of Edinburgh, EH9 3JZ, Edinburgh, UK 3. Institut für Physik, Universit?t Mainz, D-55099, Mainz, Germany 4. Laboratoire de l'Accélérateur Linéaire, IN2P3-CNRS, Université de Paris-Sud, F-91406, Orsay, France 5. Dipartimento di Fisica e Sezione INFN di Pisa, I-56100, Pisa, Italy 9. Fachbereich Physik, Universit?t Siegen, D-57068, Siegen, Germany |
| 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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