Problems and prospects in strange baryon spectroscopy Page: 4 of 8
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essentially channel-by-channel at higher momenta^6’^’^ where 3-body reactions
vitiate the constraints of unitarity. From partial wave analyses emerged the
presently known Y spectrum. '
The 1970's brought a series of specific K” electronic experiments chosen
to remedy some of the more obvious weaknesses of the earlier bubble chamber
and counter experiments. Total K p and K”d cross sections were remeasured
with higher precision to yield the isospin decomposed 1=0 and 1=1 cross sections.
These measurements revealed six new narrow resonances between 500 and 900 MeV/c
K momenta. These structures have never been adequately accommodated in sub-
sequent partial wave analyses, ’ ' nor have they been confirmed by counter ex-
periments designed to measure other things such as K~p ■+ K°n^^ and K“p ■* K"p
backward elastic scattering. ' In fact, even apart from the new structures,
these total cross sections have generally been difficult to handle in any partial
wave analysis, requiring considerable enlargement of the quoted errors to avoid
an inordinately large contribution to the overall for the fit.^®^ It would be
highly desirable to remeasure the total cross sections using wire chambers rather
than counters so as to greatly diminish the large empty-target background arising
from K decays after the target. Such an experiment could be readily done with
present beam intensities.
Polarized target experiments^^ have contributed measurements of
K"p elastic polarization. Although they did not disclose any new physics, it
was very reassuring to see that previous partial wave analyses had good pre-
dictive power and so presumably represented a reasonable approximation of
reality. With better K beams from a kaon factory polarization experiments
could be greatly improved and extended to other channels such as charge ex-
change and perhaps Eir and Air.
Here it is appropriate to point out a philosophical difference between
ttN and K N partial wave analyses. The practitioners of the former,' be-
cause of the greater ease of obtaining pion data and the dominantly single
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Tripp, R.D. Problems and prospects in strange baryon spectroscopy, article, August 1, 1983; [Berkeley,] California. (https://digital.library.unt.edu/ark:/67531/metadc1094117/m1/4/: accessed March 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.