The DIRAC experiment at CERN has achieved a sizeable production of Ie super(+Ie) super(-) atoms and has significantly improved the precision on its lifetime determination. From a sample of 21 227 ...atomic pairs, a 4% measurement of the S-wave IeIe scattering length difference inline image has been attained, providing an important test of Chiral Perturbation Theory.
Strange and multistrange baryon and antibaryon production is a useful probe into the dynamics of the hot hadronic matter created in central heavy ion interactions. Relative production yields and ...transverse mass spectra are presented for Λ,
Λ
, Ξ
− and
Ξ
+ hyperons produced in central sulphur-tungsten interactions at 200 GeV/
c per nucleon.
We report results on the production of strange baryons/antibaryons with 1, 2, and 3 units of strangeness (Λ, Ξ and Ω) and mesons (K
s
0,
K
+ and
K
−) in WA85 experiment at the CERN SPS. This ...experiment was designed to study the production of strange particles in central SW collisions at 200 GeV/c per nucleon, in the central rapidity region with medium to high
p
t
. We have measured the inverse slopes of the
m
t
distributions of such particles and the production ratios
Λ
/Λ,
Ξ
+
/Ξ
−,
Ξ
−/
Λ,
Ξ
+/
Λ
, K
s
0/
Λ,
K
s
0/
Λ
,
(Ω
− +
Ω
+)
(Ξ
− +
Ξ
+)
and
K
+
K
−
. Preliminary results on the production ratios
Ξ
−/
Λ and
Ξ
+/
Λ
in pW collisions at 200 GeV/c are also presented.
The DIRAC experiment at CERN has achieved a sizeable production of
π
+
π
−
atoms and has significantly improved the precision on its lifetime determination. From a sample of 21 227 atomic pairs, a 4% ...measurement of the S-wave
ππ scattering length difference
|
a
0
−
a
2
|
=
(
0.2533
−
0.0078
+
0.0080
|
stat
|
syst
−
0.0073
+
0.0078
)
M
π
+
−
1
has been attained, providing an important test of Chiral Perturbation Theory.
WA97 is designed to study strange and multi-strange baryon and anti-baryon production in 160 A
GeV
c
PbPb collisions at the SPS with a telescope of silicon microdetectors. Four planes of silicon ...pixel detectors were successfully employed during the 1994 Pb run. A total of 60M central PbPb events were collected. We describe the experimental setup and report on some preliminary results from the off-line analysis.
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