Observation of a New Scalar Meson

Le résumé fourni par la source

We have observed the production of a new scalar meson of mass 1255 \ifmmode\pm\else\textpm\fi{} 5 MeV and width 79 \ifmmode\pm\else\textpm\fi{} 10 MeV. The meson is observed primarily through the interference of the $S$-wave and $D$-wave ${{K}_{s}}^{0}{{K}_{s}}^{0}$ production amplitudes in the reaction ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}n{{K}_{s}}^{0}{{K}_{s}}^{0}$ at 6 and 7 GeV/c. The $S$-wave amplitude and phase are both observed to have Breit-Wigner behavior. The quantum numbers of the meson are ${J}^{P}={0}^{+}$ and $C=+1$ with ${I}^{G}={1}^{\ensuremath{-}}$ preferred.

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