Probing the gluon tomography in photoproduction of dipion
| Autor: | Cheng Zhang, Jian Zhou, Ya-Jin Zhou, Yoshikazu Hagiwara |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Particle physics Soft photon Star (game theory) media_common.quotation_subject High Energy Physics::Phenomenology FOS: Physical sciences Resonance (particle physics) Asymmetry Gluon High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Wigner distribution function High Energy Physics::Experiment Production (computer science) Nuclear Experiment Quantum media_common |
| Zdroj: | Physical Review |
| ISSN: | 2470-0029 2470-0010 |
| DOI: | 10.1103/physrevd.104.094021 |
| Popis: | A sizable $\cos 4\phi$ 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. Comment: 7 pages, 3 figures,published version in PRD |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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