Observation of KS0 semileptonic decays with the CMD-2 detector

• Published in: Physics letters. B Vol. 456; no. 1; pp. 90 - 94
• Main Authors: 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, I.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, J.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-06-1999
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/S0370-2693(99)00443-8

The decay
K
S
0→
πeν has been observed by the CMD-2 detector at the
e
+
e
− collider VEPP-2M at Novosibirsk. Of 6 million produced
K
L
0
K
S
0 pairs, 75±13 events of the
K
S
0→
πeν decay were selected. The corresponding branching ratio is B(
K
S
0→
πeν)=(7.2±1.4)×10
−4. This result is consistent with the evaluation of B(
K
S
0→
πeν) from the
K
L
0 semileptonic rate and
K
S
0 lifetime assuming
ΔS=
ΔQ .