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Study of the positive kaon, neutral antikaon, negative pion system produced in the reaction negative kaon proton goes to positive kaon neutral antikaon negative pion (lambda/neutral sigma hyperon) at 8 GeV/c
Abstract
The results of a partial wave analysis of the $K\sp{+}\overline{K\sp0}\pi\sp{-}$ system produced in the reaction $K\sp{-}p\to \ K\sp{+}\overline{K\sp0}\pi\sp{-}$ ($\Lambda/\Sigma\sp0$) at 8 GeV/c are presented. A total of 2043 events in the mass range 1.24 to 1.64 GeV/c$\sp2$ was collected using Brookhaven National Laboratory's Multiparticle Spectrometer facility. The $K\sp{+}\overline{K\sp0}\pi\sp{-}$ mass spectrum shows a small peak at 1.280 $\pm$.001 GeV/c$\sp2$ and a large peak at 1.438 $\pm$.003 GeV/c$\sp2$. The large peak is consistent with an enhancement at $K\sp{\*}K$ threshold which is cut off by our falling acceptance. There is some evidence for an accumulation of events in the region near 1.53 GeV/c$\sp2$ where previous experiments find an enhancement. The results of the partial wave analysis show that the small peak at 1.28 GeV/c$\sp2$ contains very little $J\sp{PG}$ = 1$\sp{++}$ with $a\sb0$ as the isobar, which implies that the $f\sb1$(1285) contains very little $s\overline s$. The large peak near 1.4 GeV/c$\sp2$ is largely produced by $J\sp{PG}$ = 1$\sp{+-}$ and, to a lesser extent, 1$\sp{++}$ partial waves with $K\sp\*$ as the isobar and with evidence for these waves being produced coherently, 180$\sp\circ$ out of phase. There is evidence for a below $K\sp\* K$ threshold resonance in the $J\sp{PG}$ = 1$\sp{+-}$ partial waves with mass 1344 + 29 $-$ 43 MeV/c$\sp2$ and width 40 + 38 $-$ 40 MeV/c$\sp2$. There is little evidence in the partial wave analysis results for the $f\sbsp{1}{\prime}$(1530). The $J\sp{PG}$ = 0$\sp{-+}$ partial wave with $a\sb0$ as the isobar, although small, shows rising phase in the region from 1.34 to 1.64 GeV/c$\sp2$ indicating resonance behavior.
Subject Area
Particle physics
Recommended Citation
King, Edward Walter, "Study of the positive kaon, neutral antikaon, negative pion system produced in the reaction negative kaon proton goes to positive kaon neutral antikaon negative pion (lambda/neutral sigma hyperon) at 8 GeV/c" (1991). Doctoral Dissertations Available from Proquest. AAI9132876.
https://scholarworks.umass.edu/dissertations/AAI9132876