Review of strange mesons Page: 7 of 31
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b. K+p + K++-p at 10 GeV/c(22): In an attempt to determine
the K(890), K(1420) and o content as a function of Knn effective mass,
the authors have sliced the K+- mass spectrum and have fitted the
corresponding Dalitz plots. The results are shown in Fig. 11 [note the
100-MeV bin size]. I have indicated [dotted line] the bins correspond-
ing to the L peak in the total KnT mass spectrum of Fig. 10. The
authors claim evidence for a significant increase in the amount of both
K(890)w and K(1420)r in the L region. It does appear that the observed
peak in the total Kri mass spectrum is contributed to by many different
states and not entirely byK(1420).
c. K p + K n n+p at 10 GeV/c (24): A different tack: Try to
show that [L - K(1420);)/[L - K-n] is not 100%. Figure.ll shows the
Krn effective mass spectrum for events not in the K(1420) + K n+ re-
gion [i.e. 1.32-1.52 GeV]. Clearly, an excess of events is apparent
in the L region. The number of L events in this mass distribution, as
determined by a Breit-Wigner fit, is 166 + 31 compared to 321 + 60
events [see Fig. 10] in total. The tails of the K(1420) are not suf-
ficient to explain the difference between these numbers and that ex-
pected for a pure L - K(1420)r decay mode.
d. K p - K n n+p at 4.6 GeV/c(24): Figure 11 shows the Ku
mass spectrum corresponding to a Kun slice covering the L enhancement.
Only a small amount of K(1420) is observed which is not sufficient to
account for all the L. The authors quote the branching ratio
L + K(1420)w - (20 + 20)% .
L + Total
e. K d + K w n d at 12.6 GeV/c(25.): Figure 11 shows the Kg9ua
and K1420" effective mass distributions. Even with the small statistics
it appears that the number of L events in the latter spectrum cannot
possibly account for the entire observed L peak in Fig. 10.
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Eisner, R.L. Review of strange mesons, article, January 1, 1974; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc1021429/m1/7/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.