A proposal to study Lambda0 polarization in the inclusive reaction p + p --> Lambda0 + anything with a liquid hydrogen target Page: 4 of 9
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range .25 < X < 1, and depends only on p+ in the manner shown. At
p, = 1.6 GeV/c, <aPA> = .17 .05, where a is the helicity of the
proton in A* -+ per, with the experimental value a = .647 .013.
The polarization is therefore PA = .26 .08, which is a surpris-
ingly large number. The direction of the A* spin is along n =
(PA x p PA x pl. The experimental evidence is consistent with
the polarization being due to strong interactions.
Only the complex nucleus beryllium has been used as a target
to produce polarized A0 so far. This leaves open the possibility
of complex nuclear effects contributing -to the A* polarization -
either increasing or diminishing it. For example the outgoing A*
could be rescattered by target nucleons, or secondary pions made
by the primary proton in the nucleus could be responsible for pro-
ducing the A* polarization. Although the (x, pe) dependence of the
data discriminate against such secondary processes (the polarized
A*'s always have high energy), they cannot be conclusively ruled
out. Complex nuclear effects such as those which give rise to
anomolous multiplicities of charged secondaries, discussed for
example by Van Hove,8 must be eliminated experimentally by study-
ing the production of polarized A* in hydrogen before the problem
of describing the phenomenon is clearly defined. Within the sta-
tistical accuracy of the present data, the polarization increases
monotonically with p,. It would be most interesting to follow the
curve in Fig. 1 out to higher p1 in search of a turn over in
<aPA>. Such a turn over might be a clue to the mechanism which
produces the polarization - a decaying intermediate N* state, for
example. The measurements proposed here will study the (X, p)
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Bunce, G.; Pondrom, L.; March, R.; /Wisconsin U., Madison; Devlin, T.; Edwards, R. et al. A proposal to study Lambda0 polarization in the inclusive reaction p + p --> Lambda0 + anything with a liquid hydrogen target, report, September 1, 1975; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc879864/m1/4/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.