The production of enutral kaons in e + e − annihilation has been measured for c.m. energies between 3.4 GeV and 7.6 GeV. Near 4 GeV the inclusive K S cross section shows an increase and structure similar to total hadron production. Roughly 40–45% of all hadronic final states contain kaons, except at 4.028 GeV and 4.415 GeV, where a significantly larger kaon fraction is observed.
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THIS IS TWICE THE MEASURED KS CROSS SECTION. THE ERRORS ARE STATISTICAL ONLY. THERE IS 15 PCT ABSOLUTE NORMALIZATION ERROR, PLUS POSSIBLY SOME ENERGY DEPENDENT ERROR. THE DATA ARE NOT EQUALLY SPACED IN THE ENERGY INTERVALS.
We have measured the cross sections for these reactions and the cross sections of resonances produced in them. The production of Y ∗± (1385) , ϱ o (765), and f o (1260) is observed in the first reaction; ϱ o (765) in the second; Y ∗−,o (1385), ω o (748), B − (1235), probably ϱ o,− (765), and an enhancement we interpret to be the J P = 1 2 − Σ o (1750) in the third. Single particle longitudinal momentum distributions and average values of transverse momentum are presented. The observed single particle production angular distributions show good qualitative but not quantitative agreement with the Reggeized multiperipheral model of Chan, Loskiewicz, and Allison. We found strong disagreement between the amounts of observed resonance production and the results of the multiperipheral model of Plahte and Roberts that is based on the models of Chan et al. and Veneziano. However, we included isospin effects only in an approximate manner.
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Resonance production in the above reactions containing a proton in the final state is characterized primarily by the production of K ∗− (890). The events with a final state neutron are characterized by the production of either K ∗− (890) or Δ − (1236), but very little double resonance production. Cross sections are presented. Exponential slopes for the momentum-transfer distributions of the K ∗− (890) and Δ − (1236) were determined and found to be much smaller than for elastic scattering. For the π − π − p K 0 events the spin density matrix elements for the decay of the K ∗− (890) in the Jackson frame imply alignment. Single particle longitudinal momentum distributions and average values of transverse momentum are presented. The single particle production angular distributions of all three reactions were compared with the results of the Reggeized multiperipheral model of Chan, Loskiewicz, and Allison (CLA) modified to include resonance production. Good qualitative agreement was found. The data from the π − π − p K 0 events were also compared with a multiperipheral model of Plahte and Roberts that is based on the CLA and Veneziano models.
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