The CPLEAR set-up (modified) has been used to determine the K
L–K
S mass difference by a method where neutral-kaon strangeness oscillations are monitored through kaon strong interactions, rather than ...semileptonic decays, thus requiring no assumptions on CPT invariance for the decay amplitudes. The result,
Δm=(0.5343±0.0063
stat±0.0025
syst)×10
10ℏ/s, provides a valuable input for CPT tests.
Neutral-kaon decays to
πe
ν were analysed to determine the
q
2 dependence of the K
0
e3 electroweak form factor
f
+. Based on
365
612
events, this form factor was found to have a linear dependence on
...q
2 with a slope
λ
+=0.0245±0.0012
stat±0.0022
syst.
We apply a forward dispersion relation to the regeneration amplitude for kaon scattering on \(^{12}\)C using all available data. The CPLEAR data at low energies allow the determination of the net ...contribution from the subthreshold region which turns out to be much smaller than earlier evaluations, solving a long standing puzzle.
We report the results of the CPLEAR experiment on CP-, T-, and CPT-symmetries in the neutral kaon system. CP-violation parameters are given for the K
0,
K
0 → 2π, 3π
decay channels. For the first ...time, T-violation is measured by a direct method using semileptonic decays. The CPT symmetry is tested through the parameters Im(δ) with a precision of 10
−5 and Re(δ) with a precision of a few 10
−4. With these two measurements, the difference in mass and width of K
0 and
K
0
are bound to within 10
−18 GeV. In the limit of CPT invariance in the neutral kaon decays, the K
0 and
K
0
masses are equal within 10
−19 GeV.
We study ππ correlations in the exclusive reactions
pp
→ 2π
+2π
−
and
pp
→ 2π
+2π
−π
0
at rest with complete reconstruction of the kinematics for each event. A new analysis technique has been ...developed which is model independent. With this new technique, which relies on double-differential distributions, no reference sample is needed to extract the correlation signal. The correlations are studied as a function of the four-pion invariant mass.
![[formula omitted] transitio...](http://api.summon.serialssolutions.com/2.0.0/image/issn/XR4PS5YY4K/0370-2693/small "[formula omitted] transitions monitored by strong interactions: a new determination of the K L–K S mass difference")
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