Measurement of k+(e4)-decay rates and test of the delta-s = delta-q rule

Bourquin, M.; Boymond, J.P.; Extermann, P.; Marasco, J.; Mermod, R.; Piroue, P.A.; Suter, H.; Basile, P.; Brehin, S.; Diamant-Berger, A.

doi:10.1016/0370-2693(71)90104-3

Measurement of k+(e4)-decay rates and test of the delta-s = delta-q rule

M. Bourquin
(
- CERN and
- DAPNIA, Saclay
)
,
J.P. Boymond
(
- CERN and
- DAPNIA, Saclay
)
,
P. Extermann
(
- CERN and
- DAPNIA, Saclay
)
,
J. Marasco
(
- CERN and
- DAPNIA, Saclay
)
,
R. Mermod
(
- CERN and
- DAPNIA, Saclay
)

1971

4 pages

Published in:

Phys.Lett.B 36 (1971) 615-618

Published: 1971

DOI:

10.1016/0370-2693(71)90104-3

PDG:

{{\mathit K}^{+}}

\rightarrow

{{\mathit \pi}^{+}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}

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Abstract: (Elsevier)

In a study of 1609 K e4 decays observed at the CERN PS, the rate of K + → π + π − e + ν was found to be (3.32 ± 0.31) × 10 3 sec −1 . An upper limit of 43 sec −1 at the 95 % confidence level was obtained for the ΔS = ΔQ violating mode K + → π + π + e − ν .

k+: leptonic decay
leptonic decay: k+
final states
pi+: pi-: positron: neutrino
2pi+: electron: antineutrino
final state
selection rule: strangeness
spark chamber: experimental results