YN scattering data: AL68
| Authors: |
G. Alexander,
U. Karshon,
A. Shapira,
G. Yekutieli,
R. Engelmann,
H. Filthuth,
W. Lughofer
|
| Reference: |
Phys. Rev. 173 (1968), 1452.
|
| Group: |
Heidelberg/Rehovoth
|
The experiment:
378 elastic Λ p events have been recorded in an exposure
of the Saclay 81 cm hydrogen bubble chamber at CERN to a beam of
stopping K- mesons.
Preliminary results were presented in
AL64 and
AL66.
The data:
|
Λ p → Λ p
|
total elastic cross section (SGT)
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|
|
momentum range number of SGT [mb]
[MeV/c] events
120 - 150 34 212 +/- 36
150 - 180 48 141 +/- 20
180 - 210 80 141 +/- 16
210 - 240 88 95 +/- 10
240 - 270 92 81 +/- 8
270 - 320 36 56 +/- 9
|
|
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or
|
|
|
momentum range number of SGT [mb]
[MeV/c] events
120 - 170 65 180 +/- 22
170 - 200 62 130 +/- 17
200 - 220 58 118 +/- 16
220 - 240 65 101 +/- 12
240 - 260 85 83 +/- 9
260 - 320 43 57 +/- 9
|
|
|
F/B ratio
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|
|
momentum range number of F/B
[MeV/c] events
180 - 210 80 1.01 +/- 0.24
210 - 240 88 1.27 +/- 0.28
240 - 270 92 1.29 +/- 0.27
270 - 320 36 1.55 +/- 0.53
|
|
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or
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momentum range number of F/B
[MeV/c] events
200 - 220 58 0.55 +/- 0.16
220 - 240 65 1.76 +/- 0.45
240 - 260 85 1.16 +/- 0.25
260 - 320 43 1.92 +/- 0.62
|
|
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P/E ratio
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momentum range number of P/E
[MeV/c] events
180 - 210 80 0.87 +/- 0.22
210 - 240 88 0.79 +/- 0.19
240 - 270 92 1.12 +/- 0.24
270 - 320 36 0.99 +/- 0.34
|
|
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or
|
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momentum range number of P/E
[MeV/c] events
200 - 220 58 1.00 +/- 0.29
220 - 240 65 0.74 +/- 0.20
240 - 260 85 1.14 +/- 0.25
260 - 320 43 1.01 +/- 0.32
|
Notes:
-
The Λ polarization has also been determined.
Maybe these numbers will be included later.
-
The article includes some graphs on the angular distribution of
the events. PDG extracted numbers from these graphs. We do not include
these.
-
The events have been analyzed twice: one time in bins of equal
momentum range (corresponding to the 1st table of each observable) and
one time in bins of about equal numbers of events (corresponding to
the 2nd table of each observable). PDG includes only the 2nd analysis.
