Review of strange mesons Page: 2 of 31
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distributions. The assignment JP=1 is ruled out; however, 2+ and 3
cannot be distinguished. If some dynamical assumptions are employed
and if all pmmv with m,m' > 1 are set equal to zero, then the cos9
distribution is found not to be fitted by the 3 hypothesis. Thus,
2 is strongly favored.
2. Branching Ratios: K1n/Ka: There have been some discrepancies
in the Kwr/Kn branching ratio of the K(1420). It has been shown that
this number is best obtained when the K(1420) is produced in charge-
exchange reactions rather than in reactions [i.e. Kp -+ (Kwn)p] which
have strong background problems [i.e. Q production]. A new result sub-
mitted to the conference by the Brussels/CERN/Mons/Munchen Collaboration2
[reaction K+n + K(1420)p at 4.6 CeV/c] gives
K(1420) - Kn = 0.37 + 0.10
K(1420) + K 03
which is in excellent agreement with previous determinations from the
reaction K p - K(1420)n:
3.9 GeV/c [BNL]1: .40 + .10
4.6 GeV/c [BNL]l: .46 + .10
4.1, 5.5 GeV/c [ANL]3: .49 + .10
III. PROBLEM AREAS
A. Q Region
The Q region has been extensively studied, though not with the
statistics which presently make up the A data sample. As such, the
status of the Q is even more uncertain than is that of the A . SU(3)
and the quark model have an interest in the Q region: a brotiet of the
A1 [JPC = 1++] and the B meson [JPC = 1+-] are both expected to be
present somewhere in the Q region [i.e. M(Knn) < 1.5 GeV).
The present experimental evidence argues against a simple single
(Breit-Wigner-type] resonance in the Q region. [This is not to say that
the data are in agreement with a multi-resonance hypothesis.] Let us
Arguments Against a Single Resonance in Q Region: +
(1) A compilation of the datak) on the reaction Kp -+ (Kwn) p for mo-
menta between 7.3 and 13.0 GeV/c reveals a non-Breit-Wigner shape of
the Q enhancement. As shown in Fig. 2, a sharp rise near threshold and
a rapid drop at M(Kun) ti 1.28 GeV are observed.
(2) The -slope of da/dt rapidly varies across the Kirr mass in the Q
region for Q produced in the reactions ip + 0+p 5 [Fig. 31 and
K0(K0)p + Q (Q )p [Ref. 6].
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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/m1/2/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.