Exotic andqq¯resonances in theπ+π−π−system produced inπ−pcollisions at18 GeV/c

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Abstract

A partial-wave analysis of the reaction ${\ensuremath{\pi}}^{\ensuremath{-}}\stackrel{\ensuremath{\rightarrow}}{p}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}p$ at $18 \mathrm{GeV}/c$ has been performed on a data sample of 250 000 events obtained in the Brookhaven experiment E852. The well-known ${a}_{1}(1260),$ ${a}_{2}(1320)$ and ${\ensuremath{\pi}}_{2}(1670)$ resonant states are observed. The existence of the $\ensuremath{\pi}(1800),$ ${a}_{1}(1700)$ and ${a}_{4}(2040)$ states is confirmed. The ${a}_{3}(1874)$ state is also observed. The exotic ${1}^{\ensuremath{-}+}$ ${\ensuremath{\pi}}_{1}(1600)$ state produced in the natural parity exchange process is found to decay in the $\ensuremath{\rho}(770){\ensuremath{\pi}}^{\ensuremath{-}}$ channel. A mass-dependent fit results in a resonance mass of $1593\ifmmode\pm\else\textpm\fi{}{8}_{\ensuremath{-}47}^{+29} \mathrm{MeV}{/c}^{2}$ and a width of $168\ifmmode\pm\else\textpm\fi{}{20}_{\ensuremath{-}12}^{+150} \mathrm{MeV}{/c}^{2}.$

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