Abstract
Using data taken at 23 center-of-mass energies between 4.0 and 4.6 GeV with the BESIII detector at the BEPCII collider and with a total integrated luminosity of approximately $15$ fb$^{-1}$, the process $e^+e^-\to 2(p \bar{p})$ is studied for the first time. The Born cross sections for $e^+e^-\to 2(p \bar{p})$ are measured, and no significant structure is observed in the lineshape. The baryon pair ($pp$ and $\bar{p}\bar{p}$) invariant mass spectra are consistent with phase space, therefore no hexaquark or di-baryon state is found.
Highlights
Since 2003, a series of charmonium-like states, such as Xð3872Þ [1], Yð4260Þ [2], and Zcð3900Þ [3,4], were discovered
no significant structure is observed in the lineshape
invariant mass spectra are consistent with phase space
Summary
Since 2003, a series of charmonium-like states, such as Xð3872Þ [1], Yð4260Þ [2], and Zcð3900Þ [3,4], were discovered. In 2017, BESIII reported precise measurements of the eþe− → πþπ−J=ψ cross sections in the energy region between 3.77 and 4.60 GeV [7]. BESIII has reported measurements of the cross sections for the light hadron processes of eþe− → K0SKÆπ∓π0ðηÞ [13], K0SKÆπ∓ [14], pn K0SK− þ c:c: [15], and ppπ0 [16], but no hint of charmless Yð4220Þ decays have been found. Comprehensive measurements of the cross sections for eþe− → light hadrons are important to search for charmless decays of Y states and to deeply explore the composition and properties of Y states. A resonance dÃð2380Þ in the isoscalar twopion fusion process pn → dπ0π0 was observed by WASA [17] This state was later confirmed by the other two-pion fusion processes pn → dπþπ− [18] and pp → dπþπ0 [19], and the two-pion nonfusion processes pn → ppπ0π− [20] and pn → pnπ0π0 [21]. We search for a potential structure similar to dÃð2380Þ in the pp and pp ̄ mass spectra
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