Cross section measurement of $e^{+}{e}^{-}\to p\bar{p}\hat{I}\cdot$ and $e^{+}{e}^{-}\to p\bar{p}\ddot{I}‰$ at center-of-mass energies between 3.773 GeV and 4.6 GeV

Abstract

Based on $14.7{\text{fb}}^{-1}$ of $e^{+}{e}^{-}$ annihilation data collected with the BESIII detector at the BEPCII collider at 17 different center-of-mass energies between $3.7730\text{GeV}$ and $4.5995\text{GeV}$, Born cross sections of the two processes $e^{+}{e}^{-}\to p\bar{p}\hat{I}\cdot$ and $e^{+}{e}^{-}\to p\bar{p}\ddot{I}‰$ 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 $e^{+}{e}^{-}\to V\to p\bar{p}\hat{I}\cdot$ and $e^{+}{e}^{-}\to V\to p\bar{p}\ddot{I}‰$ 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 $\ddot{I}ˆ(4230)$ of $m=4.2187\text{GeV}/c^2$ and $\hat{I}“=44\text{MeV}$, we find upper limits on resonant production of the $p\bar{p}\hat{I}\cdot$ and $p\bar{p}\ddot{I}‰$ final states of $7.5\text{pb}$ and $10.4\text{pb}$ at the $90\%$ CL, respectively.

12 pages, 4 figures