# A study of the kaon(+)-anti kaon(0)-pi(-) system produced in the reaction pi(-) proton going to kaon(+) anti kaon(0) pi(-) neutron at 18 GeV/c

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 Title: A study of the kaon(+)-anti kaon(0)-pi(-) system produced in the reaction pi(-) proton going to kaon(+) anti kaon(0) pi(-) neutron at 18 GeV/c Cummings, John Pauly The results of a partial wave analysis of the $K\sp+\bar K\sp0\pi\sp-$ system produced in the reaction$$\pi\sp-p \to K\sp+\bar K\sp0\pi\sp-n$$at 18 GeV/c are presented. A total of 5612 events in the mass range 1.2-1.8 GeV/c$\sp2$ was collected using Brookhaven National Laboratory's Multiparticle Spectrometer facility. The $K\sp+\bar K\sp-\pi\sp-$ mass spectrum shows two clear peaks: one at 1.285 $\pm$ 0.001 GeV/c$\sp2$ with width 0.022 $\pm$ 0.003 GeV/c$\sp2$ and one at 1.423 $\pm$ 0.004 GeV/c$\sp2$ with width 0.062 $\pm$ 0.005 GeV/c$\sp2.$ The results of the partial wave analysis show the lower mass peak to be approximately equal parts $J\sp{PG} = 1\sp{++}$ and 0$\sp{-+},$ both decaying to $a\sb0(980)\pi\sp-$ with essentially no background. The analysis of the higher mass peak shows two $J\sp{PG} = 0\sp{-+}$ states: one at 1.412 $\pm$ 0.002 GeV/c$\sp2$ with a width of 0.036 $\pm$ 0.012 decaying into $a\sb0(980)\pi\sp-,$ and one at 1.475 $\pm$ 0.006 GeV/c$\sp2$ with a width of 0.081 $\pm$ 0.014 GeV/c$\sp2$ decaying into $K\sp*(892)K.$ The $J\sp{PG} = 1\sp{++}$ wave in this region rises rapidly to a constant value and does not show resonant behavior. The phase-space background begins increasing rapidly at $K\sp*(892)K$ threshold. The dominant contribution to the total signal is from positive reflectivity waves only. This corresponds to natural spin-parity Reggion exchange, presumably $a\sb0$(980) or $a\sb2$(1320). Cummings, John Pauly. (1995) "A study of the kaon(+)-anti kaon(0)-pi(-) system produced in the reaction pi(-) proton going to kaon(+) anti kaon(0) pi(-) neutron at 18 GeV/c." Doctoral Thesis, Rice University. http://hdl.handle.net/1911/16809. http://hdl.handle.net/1911/16809 1995