Developments in the phenomenology of two-to-three particle reactions Page: 11 of 50
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behavior bKo > b.y, controlled by the n exchange graph, whereas events
with cosys < 0 should follow the K exchange systematics, bo > bKo.
If this prediction fails, the Deck model is in serious difficulty.
A second reaction for which there are data is ir p -+ rn- ) at
16 GeV/c.9 No cross-over is observed in the total sample. Here os is the
helicity angle of the A' in the (nA++) rest frame. Events with cos;s > 0
should have a cross-over determined by (nr,-) elastic scattering, namely
bn+ > bn- . If cose5 < 0, the Deck graph incorporates (N 4+) elastic
scattering, for which bn > b,+ is expected. The overall absence of a
cross-over suggests equal compensating contributions fran the n and A
exchange graphs. These predictions were checked in the data by making
the 0s selections and examining the cross-over properties of the t-distributions
in the two segments. The predictions are confirmed. The same predictions
apply to K'p + K ( am), for which data exist at 8 GeV/c.5
The success of the cross-over predictions for n p i -( pe) confirms
the utility of the costs selection procedure. It also helps to establish
that the costs > 0 region shows quantum number characteristics (symmetry
properties) of n exchange, whereas the costs < 0 region has baryon exchange
properties. Thus, the validity of using exchanges of specific type to describe
the low mass (n dA ) enhancement is supported. Note, in passing, that the
data show also that production and decay of (7- -) do not factorize, in
that different portios of the decay angular distribution have different
5. A DFEEN RESOUION OF THE Q CRSS-OVER PROBLEM
Cbhen-Tannoudji and collaborators14 at Saclay have found a different
theoretical way to explain the cross-over problem11 for Q + Qop and
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Berger, E.L. Developments in the phenomenology of two-to-three particle reactions, report, July 1, 1975; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc880533/m1/11/: accessed June 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.