Abstract
Based on $14.7~\textrm{fb}^{-1}$ of $e^+e^-$ annihilation data collected with the BESIII detector at the BEPCII collider at 17 different center-of-mass energies between $3.7730~\textrm{GeV}$ and $4.5995~\textrm{GeV}$, Born cross sections of the two processes $e^+e^- \to p\bar{p}\eta$ and $e^+e^- \to p\bar{p}\omega$ 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 $e^+e^- \to V \to p\bar{p}\eta$ and $e^+e^- \to V \to p\bar{p}\omega$ 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 $\psi(4230)$ of $m=4.2187~\textrm{GeV}/c^{2}$ and $\Gamma=44~\textrm{MeV}$, we find upper limits on resonant production of the $p\bar{p}\eta$ and $p\bar{p}\omega$ final states of $7.5~\textrm{pb}$ and $10.4~\textrm{pb}$ at the $90\%$ CL, respectively.
Highlights
In recent years, several unexpected states have been discovered in the charmonium sector
Notable examples are the χc1ð3872Þ discovered by Belle [1], the charged charmoniumlike Zcð3900Þ discovered by BESIII [2] and the vector states ψð4220Þ and ψð4390Þ, originally discovered by BABAR [3] as a single broad resonance named Yð4260Þ in the eþe− → γISRπþπ−J=ψ process, and later found to be two distinct states by BESIII [4]
Channels that include a proton antiproton pair are especially interesting, since the partial width of decays of the type V → pph, where V is a vector-state in the charmonium region and h is a light meson, can be related to the production cross section pp → Vh [17]
Summary
Several unexpected states have been discovered in the charmonium sector. Channels that include a proton antiproton pair are especially interesting, since the partial width of decays of the type V → pph, where V is a vector-state in the charmonium region and h is a light meson, can be related to the production cross section pp → Vh [17]. In light of the upcoming PANDA experiment at the FAIR facility [18], it is important to obtain the production cross sections of potentially exotic resonances in the charmonium sector. We report measurements of the Born cross sections of the processes eþe− → ppη and eþe− → ppω for data energies bceotwlleecetnedpffisaffi t1⁄4137.7d7i3ff0erGenetV center-of-mass (c.m.) and 4.5995 GeV with the BESIII detector. The center-of-mass energy dependence of both cross sections is investigated for possible resonant contributions V → ppη and V → ppω
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