Problems and prospects in strange baryon spectroscopy Page: 3 of 8
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To appear in the Proceedings of the
Third LAMPF II Workshop, July 1983
PROBLEMS AND PROSPECTS IN STRANGE BARYON SPECTROSCOPY
R. D. Tripp
Lawrence Berkeley Laboratory
University of California
Berkeley, California 94720
The study of Y resonances by means of formation experiments has long
suffered from deficiences of available K” beams, both in intensity and purity.
For example a typical single-stage separated K~ beam of 750 MeV/c has at BNL^
or CERN an intensity of about 10® K~/pulse with a ratio of K" to contaminating
it", p , and e” of 1:10. At a kaon factory the K" yield is expected to be
several orders of magnitude higher. Then, trading intensity for purity by
employing two stages of separation and/or improved beam optics/^ one could
reasonably expect to obtain an intensity of 10® K~/sec, unencumbered by the
high contamination that would otherwise torture the apparatus. Such luxurious
beams have long been available with pions for use in studying nucleon resonances
and are the major reason for the more satisfactory experimental status of the
In fact most of our knowledge of Y 's derives not from high flux exper-
iments but from systematic but low statistics K" bubble chamber experiments.
The usual bubble chamber experiment at one momentum contains a K’ path length^
equivalent to less than a one-second exposure to a high intensity (10®) K" beam!
Such experiments laboriously scanned the Y region during the 1960's, carefully
measuring and cataloging the various K reactions (K p * K’p, K°n, Am, I_’°m+’°,
E°n, e°’"K°’+, 3 body reactions), thereby determining channel cross sections,
angular distributions, and hyperon polarizations as a function of beam momentum.
These data, sometimes augmented by K’n or K^p studies, were subjected to energy-
dependent partial wave analyses; coupled channel at low momenta,but
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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/m1/3/: accessed March 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.