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ISSN - 03702693, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 1999, vol. 456, p. 90-94

Observation of KS 0 semileptonic decays with the CMD-2 detector

Akhmetshin R. R., Anashkin E. V., Arpagaus M., Aulchenko V. M., Banzarov V. Sh, Barkov L. M., Baru S. E., Bashtovoy N. S., Bondar A. E., Bondarev D. V., Bragin A. V., Chernyak D. V., Chertovskikh A. G., Dvoretsky A. S., Eidelman S. I., Fedotovich G. V., Gabyshev N. I., Grebeniuk A. A., Grigoriev D. N., Ivanov P. M., Karpov S. V., Khazin B. I., Koop I. A., Kurdadze L. M., Kuzmin A. S., Logashenko I. B., Lukin P. A., Mikhailov K. Yu, Nesterenko L. N., Okhapkin V. S., Perevedentsev E. A., Popov A. S., Purlatz T. A., Root N. I., Ruban A. A., Ryskulov N. M., Shamov A. G., Shatunov Yu M., Shekhtman A. I., Shwartz B. A., Sidorov V. A., Skrinsky A. N., Smakhtin V. P., Snopkov I. G., Solodov E. P., Stepanov P. Yu, Sukhanov A. I., Titov V. M., Yudin Yu V., Zverev S. G., Thompson I. A.

The decay KS 0 → π ev has been observed by the CMD-2 detector at the e+ e- collider VEPP-2M at Novosibirsk. Of 6 million produced KL 0 KS 0 pairs, 75 ± 13 events of the KS 0 → π ev decay were selected. The corresponding branching ratio is B(KS 0 → π ev) = (7.2 ± 1.4) × 10-4. This result is consistent with the evaluation of B(KS 0 → π ev) from the KL 0 semileptonic rate and KS 0 lifetime assuming ΔS= ΔQ. © 1999 Published by Elsevier Science B.V. All rights reserved.