Probing the gluon tomography in photoproduction of di-pions

Abstract

A sizable $\cos 4\varphi$ azimuthal asymmetry in exclusive di-pion production near ${\rho }^0$ resonance peak in ultraperipheral heavy ion collisions recently has been reported by STAR collaboration. We show that both elliptic gluon Wigner distribution and final state soft photon radiation can give rise to this azimuthal asymmetry. The fact that the QED effect alone severely underestimates the observed asymmetry might signal the existence of the nontrivial correlation in quantum phase distribution of gluons.

arXiv comment7 pages, 3 figures,published version in PRD

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• Harmonics of Parton Saturation in Lepton-Jet Correlations at the EIC
• Energy evolution of T-odd gluon TMDs at small $x$
• Azimuthal asymmetries of muon pair production in ultraperipheral heavy ion collisions
• Photoproduction of $e^{+}{e}^{-}$ in peripheral isobar collisions
• Measurement of the impact-parameter dependent azimuthal anisotropy in coherent ${\rho }^0$ photoproduction in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Probing Quantum Phenomena through Photoproduction in Relativistic Heavy-Ion Collisions
• Constraining axion-gluon coupling in monohadron processes
• Nuclear deformation effects in photoproduction of $\rho$ mesons in ultraperipheral isobaric collisions