Observation of $e^{+}{e}^{-}\to pp\bar{p}\bar{n}{\pi }^{-}+c.c.$

Abstract

Using data taken at 29 center-of-mass energies between 4.16 and 4.70 GeV with the BESIII detector at the Beijing Electron Positron Collider corresponding to a total integrated luminosity of approximately 18.8 $\mathrm{f}{\mathrm{b}}^{-1}$, the process $e^{+}{e}^{-}\to pp\bar{p}\bar{n}{\pi }^{-}+c.c.$ is observed for the first time with a statistical significance of $11.5\sigma$. The average Born cross sections in the energy ranges of (4.160, 4.380) GeV, (4.400, 4.600) GeV and (4.610, 4.700) GeV are measured to be $(21.5\pm 5.7\pm 1.2)$ fb, $(46.3\pm 10.6\pm 2.5)$ fb and $(59.0\pm 9.4\pm 3.2)$ fb, respectively, where the first uncertainties are statistical and the second are systematic. The line shapes of the $\bar{p}\bar{n}$ and $pp{\pi }^{-}$ invariant mass spectra are consistent with phase space distributions, indicating that no hexaquark or di-baryon state is observed.

arXiv comment10 pages, 4 figures. Submitted to Chinese Physics C

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