Determination of the low-energy pi pi phase shifts and form-factors in k+(e4) decay

Basile, P.; Brehin, S.; Diamant-Berger, A.; Kunz, P.; Lemoine, M.; Turlay, R.; Zylbersztejn, A.; Bourquin, M.; Boymond, J.P.; Extermann, P.

doi:10.1016/0370-2693(71)90105-5

Determination of the low-energy pi pi phase shifts and form-factors in k+(e4) decay

P. Basile
(
- DAPNIA, Saclay and
- CERN
)
,
S. Brehin
(
- DAPNIA, Saclay and
- CERN
)
,
A. Diamant-Berger
(
- DAPNIA, Saclay and
- CERN
)
,
P. Kunz
(
- DAPNIA, Saclay and
- CERN
)
,
M. Lemoine
(
- DAPNIA, Saclay and
- CERN
)

1971

4 pages

Published in:

Phys.Lett.B 36 (1971) 619-622

Published: 1971

DOI:

10.1016/0370-2693(71)90105-5

View in:

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Abstract: (Elsevier)

In a study of 1609 K e4 + decays observed at the CERN PS we have obtained a single solution for the form factors and the π − π phase-shift difference Δ = δ s 0 − δ p 1 averaged over the invariant dipion mass ( m ππ =313 MeV ) . We found Δ = 0.37 ± 0.07.

k+: leptonic decay
leptonic decay: k+
final state
pi+: pi-: positron: neutrino
form factor
pi pi: interaction
interaction: pi pi
partial wave
spark chamber: experimental results