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The production of quark-antiquark pairs along a color flux tube precedes thefragmentation of the tube. Because of local conservation laws, the productionof a $q$-$\bar q$ pair will lead to correlations of adjacently produced mesons(mostly pions). Adjacently produced mesons however can be signalled by theirrapidity difference $\Delta y$ falling within the window of $|\Delta y |$$\lesssim$$ 1/(dN/dy)$, on account of the space-time-rapidity ordering ofproduced mesons in a flux tube fragmentation. Therefore, the local conservationlaws of momentum, charge, and flavor will lead to a suppression of angularcorrelation function $dN/(d\Delta \phi\, d\Delta y)$ for two mesons withopposite charges or strangeness on the near side at $(\Delta \phi, \Delta y)$$\sim$0, but an enhanced correlation on the back-to-back, away side at $\Delta\phi$$\sim$$ \pi$, within the window of $|\Delta y |$$\lesssim$$ 1/(dN/dy)$.These properties can be used as signatures for the fragmentation of a colorflux tube. The gross features of the signature of flux tube fragmentation fortwo oppositely charged mesons are qualitatively consistent with the STAR andNA61/SHINE angular correlation data for two hadrons with opposite charges inthe low-$p_T$ region in high-energy $pp$ collisions.

Signature of the Fragmentation of a Color Flux Tube