Cross section measurement of e+e−→pp¯η and e+e−→pp¯ω at center-of-mass energies between 3.773 GeV and 4.6 GeV

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Abstract

Based on $14.7\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ annihilation data collected with the BESIII detector at the BEPCII collider at 17 different center-of-mass energies between 3.7730 GeV and 4.5995 GeV, Born cross sections of the two processes ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}p\overline{p}\ensuremath{\eta}$ and ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}p\overline{p}\ensuremath{\omega}$ are measured for the first time. No indication of resonant production through a vector state $V$ is observed, and upper limits on the Born cross sections of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}V\ensuremath{\rightarrow}p\overline{p}\ensuremath{\eta}$ and ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}V\ensuremath{\rightarrow}p\overline{p}\ensuremath{\omega}$ at the 90% confidence level are calculated for a large parameter space in resonance masses and widths. For the current world average parameters of the $\ensuremath{\psi}(4230)$ of $m=4.2187\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ and $\mathrm{\ensuremath{\Gamma}}=44\text{ }\text{ }\mathrm{MeV}$, we find upper limits on resonant production of the $p\overline{p}\ensuremath{\eta}$ and $p\overline{p}\ensuremath{\omega}$ final states of 7.5 pb and 10.4 pb at the 90% CL, respectively.

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