Observation of a7πEnhancement at 3.01 GeV

Abstract

In an $11.0\ensuremath{-}\frac{\mathrm{GeV}}{c} {\ensuremath{\pi}}^{+}p$ exposure in the BNL 80-in. hydrogen-filled bubble chamber, 171 events have been found that fit the reaction ${\ensuremath{\pi}}^{+}+p\ensuremath{\rightarrow}4{\ensuremath{\pi}}^{+}+3{\ensuremath{\pi}}^{\ensuremath{-}}+{\ensuremath{\pi}}^{0}+p$. The ($4{\ensuremath{\pi}}^{+}3{\ensuremath{\pi}}^{\ensuremath{-}}$) and ($3{\ensuremath{\pi}}^{+}3{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$) effective-mass spectra both show a statistically significant peak at 3.013 GeV with a width less than 0.04 GeV. This enhancement agrees well both in position and in width with one of the peaks observed in a CERN missing-mass spectrometer experiment.

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