Measurement of Two-Particle Correlations of Hadrons in $e^{+}{e}^{-}$ Collisions at Belle

Abstract

The measurement of two-particle angular correlation functions in high-multiplicity $e^{+}{e}^{-}$ collisions at $\sqrt{s}=10.52$ GeV is reported. In this study, the $89.5{\text{fb}}^{-1}$ of hadronic $e^{+}{e}^{-}$ annihilation data collected by the Belle detector at KEKB are used. Two-particle angular correlation functions are measured in the full relative azimuthal angle ($\Delta \varphi$) and three units of pseudorapidity ($\Delta \eta$), defined by either the electron beam axis or the event-shape thrust axis, and are studied as a function of charged-particle multiplicity. The measurement in the thrust axis analysis, with mostly outgoing quark pairs determining the reference axis, is sensitive to the region of additional soft gluon emissions. No significant anisotropic collective behavior is observed with either coordinate analyses. Near-side jet correlations appear to be absent in the thrust axis analysis. The measurements are compared to predictions from various event generators and are expected to provide new constraints to the phenomenological models in the low-energy regime.

Submitted to Phys. Rev. Lett. 8 pages, 3 figures

References in corpus (5)

• The Color Glass Condensate
• Observation of long-range near-side angular correlations in proton-lead collisions at the LHC
• The ridge in proton-proton collisions at the LHC
• Azimuthal harmonics in small and large collision systems at RHIC top energies
• Strangeness enhancement and flow-like effects in $e^{+}{e}^{-}$ annihilation at high parton density

Cited by in corpus (6)

• Overview of high-density QCD studies with the CMS experiment at the LHC
• Two-particle azimuthal correlations in $\gamma$p interactions using pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV
• Observation of enhanced long-range elliptic anisotropies inside high-multiplicity jets in pp collisions at $\sqrt{s}$ = 13 TeV
• Universality of scaled particle spectra in ultrarelativistic heavy-ion collisions
• Exploring hidden sectors with two-particle angular correlations at future $e^{+}{e}^{-}$ colliders
• Impact of soft QCD effects over intrajet azimuthal anisotropies