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The enhancement of charged-particle pairs with large pseudorapiditydifference and small azimuthal angle difference, often referred to as the``ridge signal'', is a phenomenon widely observed in high multiplicityproton-proton, proton-ion and deutron-ion collisions, which is not yet fullyunderstood. In heavy-ion collisions, the hydrodynamic expansion of theQuark-Gluon Plasma is one of the possible explanations of the origin of theridge signal. Measurements in the $e^+e^-$ collision system, without thecomplexities introduced by hadron structure in the initial state, can serve asa complementary probe to examine the formation of a ridge signal. The firstmeasurement of two-particle angular correlation functions in high multiplicity$e^+e^-$ collisions at $\sqrt{s}=10.52$ GeV is reported. The hadronic $e^+e^-$annihilation data collected by the Belle detector at KEKB are used in thisstudy. Two-particle angular correlation functions are measured over the fullazimuth and large pseudorapidity intervals which are defined by either theelectron beam axis or the event thrust as a function of charged particlemultiplicity. The measurement in the event thrust analysis, with mostlyoutgoing quark pairs determining the reference axis, is sensitive to the regionof additional soft gluon emissions. No significant ridge signal is observedwith either coordinates analyses. Near side jet correlations appear to beabsent in the thrust axis analysis. The measurements are compared topredictions from various event generators and expected to provide newconstraints to the phenomenological models in the low energy regime.

Measurement of two-particle correlations in hadronic $e^{+}e^{-}$ collisions at Belle