YN scattering data: EI71
The experiment:
K- mesons were stopped in the 81 cm Saclay Hydrogen
Bubble Chamber at the CERN Proton-Synchroton.
1521 Σ- p events were recorded.
283 Σ+ p events were recorded.
After applying cut-off criteria 406 Σ- p events
and 121 Σ+ p events were analyzed.
The data:
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Σ+ p → Σ+ p
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total elastic cross section (SGT)
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momentum range number of SGT [mb] cos(theta) cos(theta)
[MeV/c] events min max
140 - 150 4 123 +/- 62 -0.25 0.31
150 - 160 13 104 +/- 30 -0.35 0.39
160 - 170 35 92 +/- 18 -0.42 0.46
170 - 180 69 81 +/- 12 -0.49 0.52
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differential cross section (DSG)
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based on 156 events in the range 160 - 180 MeV/c
cos(theta) DSG [mb]
-0.6 - -0.4 36 +/- 8
-0.4 - -0.2 32 +/- 7
-0.2 - 0.0 54 +/- 9
0.0 - 0.2 47 +/- 8
0.2 - 0.4 50 +/- 10
0.4 - 0.6 58 +/- 10
0.6 - 0.7 52 +/- 32
|
|
Σ- p → Σ- p
|
total elastic cross section (SGT)
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|
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momentum range number of SGT [mb] cos(theta) cos(theta)
[MeV/c] events min max
130 - 140 14 184 +/- 52 -0.13 0.19
140 - 145 19 152 +/- 38 -0.22 0.28
145 - 150 30 146 +/- 30 -0.27 0.32
150 - 155 49 142 +/- 25 -0.32 0.37
155 - 160 81 164 +/- 32 -0.36 0.41
160 - 165 107 138 +/- 19 -0.40 0.44
165 - 170 106 113 +/- 16 -0.44 0.48
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differential cross section (DSG)
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based on 236 events in the range 150 - 170 MeV/c
cos(theta) DSG [mb]
-0.5 - -0.4 37 +/- 29
-0.4 - -0.2 57 +/- 14
-0.2 - 0.0 77 +/- 14
0.0 - 0.2 75 +/- 13
0.2 - 0.4 72 +/- 12
0.4 - 0.6 91 +/- 16
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Notes:
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The cross sections are combined coulomb-nuclear cross sections.
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Corrections for losses in angular regions due to cut-off criteria
are based on the assumption of isotropic angular distribution.
The table contains the cosines of the cut-off angles. This allows
model-contructors to take the possibility of non-isotropy of
the angular distrubution
in account. (See for example M.M. Nagels, Thesis, 1975)
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The normalization uncertainties are not included.
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There is an interesting footnote on the normalization of the
cross sections of DO66.
These should be renormalized with a factor 1.08
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The numbers for the differential cross sections are taken from table 2.5
of M.M. Nagels, thesis University of Nijmegen, 1975. These numbers are
read from a graph.
