YN scattering data: SE68
The experiment:
In the Saclay 81 cm Hydrogen Bubble Chamber which was exposed to a beam
of K- mesons (about 230 MeV/c) from the
Proton-Synchroton at CERN.
100000 pictures were scanned. 336 events were recorded of which 224 are
used in the analyses.
Preliminary results were published in SE64.
The data:
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Λ p → Λ p
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total elastic cross section (SGT)
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momentum range number of SGT [mb]
[MeV/c] events
120 - 150 14 209 +/- 58
150 - 180 28 177 +/- 38
180 - 210 49 153 +/- 27
210 - 240 54 111 +/- 18
240 - 270 59 87 +/- 13
270 - 330 20 46 +/- 11
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angular distribution
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averaged over the range 180 - 248 MeV/c
cos(theta) number of
events
-1.0 - -0.75 20.0 +/- 4.0
-0.75 - -0.5 25.0 +/- 5.0
-0.5 - -0.25 32.0 +/- 6.0
-0.25 - 0.0 23.4 +/- 5.0
0.0 - 0.25 22.0 +/- 4.0
0.25 - 0.5 25.5 +/- 4.6
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angular distribution
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averaged over the range 248 - 330 MeV/c
cos(theta) number of
events
-1.0 - -0.75 7.8 +/- 3.3
-0.75 - -0.5 9.3 +/- 3.3
-0.5 - -0.25 7.5 +/- 3.1
-0.25 - 0.0 11.1 +/- 3.5
0.0 - 0.25 23.4 +/- 4.0
0.25 - 0.5 22.0 +/- 4.0
0.5 - 0.75 25.0 +/- 6.6
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F/B ratio
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momentum range number of F/B
[MeV/c] events
180 - 248 0.9 +/- 0.2
248 - 330 1.8 +/- 0.4
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Notes:
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The numbers for the angular distributions were taken from
PDG (read from a graph).
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Theta is the angle that the Λ particle makes with the
beam in the CM system.
-
Corrections for cut-offs are applied; isotropic scattering in the CM
is assumed.
