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28 April 2017

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YN scattering data: HA74

Authors: J.M. Hauptmann
Reference: J.M. Hauptmann, thesis LBL-3608, U of California Berkeley, unpublished 1974
Group: LRL

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:

Λ p → Λ p
total cross section (SGT)
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
or
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
differential cross section (DSG)
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

Polarization of the outgoing Λ (P)
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

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.

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