YN scattering data: HA74
| Authors: |
J.M. Hauptmann
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| Reference: |
J.M. Hauptmann, thesis LBL-3608, U of California Berkeley, unpublished 1974
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| Group: |
LRL
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The experiment:
Various Λ p events have been recorded in an exposure of the
SLAC 82-inch bubble chamber to a 12 GeV/c K- beam.
To enhance the flux of Λ-particles a platinum target
is placed inside the bubble chamber.
500000 photographs were scanned.
A total number of 992 (in)elastic events are analyzed.
The Λ p total elastic cross sections were
published in HA77.
The data:
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Λ p → Λ p
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total cross section (SGT)
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momentum range number of SGT [mb]
[MeV/c] events
400 - 1200 ) 14.8 +/- 1.6
1200 - 1800 ) 17.5 +/- 1.7
1800 - 2600 ) 17.1 +/- 1.7
2600 - 3600 ) 584 15.3 +/- 1.5
3600 - 4900 ) 11.4 +/- 1.3
4900 - 6900 ) 8.6 +/- 1.2
6900 - 10000 ) 6.5 +/- 1.2
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or
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momentum range number of SGT [mb]
[MeV/c] events
300 - 400 17.2 +/- 8.6
400 - 500 26.9 +/- 7.8
500 - 600 7.0 +/- 4.0
600 - 700 9.0 +/- 4.0
700 - 800 13.6 +/- 4.5
800 - 900 11.3 +/- 3.6
900 - 1000 11.3 +/- 3.8
1000 - 1100 21.1 +/- 4.8
1100 - 1200 14.0 +/- 3.4
1200 - 1300 9.6 +/- 2.9
1300 - 1400 13.5 +/- 3.4
1400 - 1500 26.0 +/- 4.8
1500 - 1600 16.4 +/- 3.7
1600 - 1700 15.9 +/- 4.1
1700 - 1800 23.5 +/- 5.0
1800 - 1900 23.3 +/- 6.0
1900 - 2000 19.8 +/- 4.4
2000 - 2100 20.1 +/- 5.6
2100 - 2200 16.3 +/- 4.5
2200 - 2300 17.6 +/- 5.1
2300 - 2400 18.0 +/- 4.8
2400 - 2500 9.6 +/- 3.4
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differential cross section (DSG)
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d(sigma)/d(t)
momentum range | -t [(GeV/c)<sup>2</sup>]
[MeV/c] |
| 0.01-0.11 0.11-0.21 0.21-0.31 0.31-0.41 0.41-0.51
___________________________________________________________________________
1000 - 1500 | 32.9 30.2 19.4 13.4 15.7
| ± 6.0 ± 5.7 ± 4.6 ± 3.8 ± 4.1
1500 - 2000 | 51.6 54.5 23.3 24.7 7.1
| ± 7.8 ± 8.0 ± 5.2 ± 5.4 ± 2.9
2000 - 3000 | 43.4 32.4 20.4 8.4 16.0
| ± 5.8 ± 5.0 ± 4.0 ± 2.6 ± 3.5
3000 - 5000 | 45.4 26.3 22.6 8.6 4.9
| ± 5.0 ± 3.8 ± 3.5 ± 2.2 ± 1.6
5000 - 10000 | 29.6 14.5 16.4 4.1 3.5
| ± 4.0 ± 2.0 ± 3.0 ± 1.5 ± 1.4
momentum range | -t [(GeV/c)<sup>2</sup>]
[MeV/c] |
| 0.51-0.61 0.61-0.71 0.71-0.81 0.81-0.91 0.91-1.0
___________________________________________________________________________
1000 - 1500 | 6.6 9.8 8.6 6.6 4.4
| ± 2.6 ± 3.2 ± 3.0 ± 2.1 ± 2.1
1500 - 2000 | 4.1 7.1 1.4 1.5
| ± 2.2 ± 2.9 ± 1.3 ± 1.3
2000 - 3000 | 8.4 1.4 5.6 1.1
| ± 2.6 ± 1.1 ± 2.1 ± 0.9
3000 - 5000 | 1.4 2.7 0.7 0.7
| ± 0.9 ± 1.2 ± 0.6 2.2 ± 0.6
5000 - 10000 | 1.0
| ± 0.7
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Polarization of the outgoing Λ (P)
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momentum range P
[MeV/c]
400 - 1000 0.0 +/- 0.4
1000 - 2000 0.07 +/- 0.20
2000 - 4000 0.02 +/- 0.20
4000 - 10000 0.17 +/- 0.30
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Notes:
The table with differential cross sections is taken from appendix XI.
Figure 9 on page 29 gives differential cross sections for
different momentum and angular ranges.
