Study of $J/\psi \rightarrow \omega p \bar{p}$ at BESIII

TL;DR

This study investigates the decay of J/psi into omega and proton-antiproton pairs at BESIII, finding no near-threshold enhancement and setting upper limits on related branching fractions.

Contribution

First measurement of J/psi to omega p p-bar decay with a large data sample, providing constraints on possible p p-bar threshold enhancements.

Findings

No significant p p-bar threshold enhancement observed.

Branching fraction of J/psi to omega p p-bar measured as (9.0 ± 0.2(stat) ± 0.9(syst)) × 10^{-4}.

Upper limit for J/psi to omega X(p p-bar) set at 3.9×10^{-6} at 95% confidence level.

Abstract

The decay $J/\psi \rightarrow \omega p \bar{p}$ has been studied, using $225.3\times 10^{6}$ $J/\psi$ events accumulated at BESIII. No significant enhancement near the $p\bar{p}$ invariant-mass threshold (denoted as $X(p\bar{p})$) is observed. The upper limit of the branching fraction $\mathcal{B}(J/\psi \rightarrow \omega X(p\bar{p}) \rightarrow \omega p \bar{p})$ is determined to be $3.9\times10^{-6}$ at the 95% confidence level. The branching fraction of $J/\psi \rightarrow \omega p \bar{p}$ is measured to be $\mathcal{B}(J/\psi \rightarrow \omega p \bar{p}) =(9.0 \pm 0.2\ (\text{stat.})\pm 0.9\ (\text{syst.})) \times 10^{-4}$.