The cos 2ϕ azimuthal asymmetry in ρ 0 meson production in ultraperipheral heavy ion collisions
Abstract We present a detailed study of vector meson photoproduction in ultraperipheral heavy ion collisions (UPCs). Using the dipole model, we develop a framework for the joint impact parameter and transverse momentum dependent cross sections. We compute the unpolarized cross section and cos 2ϕ azi...
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doaj-d0499952c3ed44e0a950e29a0a3f95612020-11-25T03:50:44ZengSpringerOpenJournal of High Energy Physics1029-84792020-10-0120201011810.1007/JHEP10(2020)064The cos 2ϕ azimuthal asymmetry in ρ 0 meson production in ultraperipheral heavy ion collisionsHongxi Xing0Cheng Zhang1Jian Zhou2Ya-Jin Zhou3Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal UniversityKey Laboratory of Particle Physics and Particle Irradiation (MOE), Institute of Frontier and Interdisciplinary Science, Shandong University (QingDao)Key Laboratory of Particle Physics and Particle Irradiation (MOE), Institute of Frontier and Interdisciplinary Science, Shandong University (QingDao)Key Laboratory of Particle Physics and Particle Irradiation (MOE), Institute of Frontier and Interdisciplinary Science, Shandong University (QingDao)Abstract We present a detailed study of vector meson photoproduction in ultraperipheral heavy ion collisions (UPCs). Using the dipole model, we develop a framework for the joint impact parameter and transverse momentum dependent cross sections. We compute the unpolarized cross section and cos 2ϕ azimuthal angular correlation for ρ 0 photoproduction with ϕ defined as the angle between the ρ 0’s transverse momentum and its decay product pion meson’s transverse momentum. Our result on unpolarized coherent differential cross section gives excellent description to the STAR experimental data. A first compari- son between theoretical calculation and experimental measurement on the cos 2ϕ azimuthal asymmetry, which results from the linearly polarized photons, is performed and reasonable agreement is reached. We find out the characteristic diffractive patterns at both RHIC and LHC energies and predict the impact parameter dependent cos 2ϕ azimuthal asymmetries for ρ 0 photoproduction by considering UPCs and peripheral collisions. The future experimental measurements at RHIC and LHC relevant to our calculations will provide a tool to rigorously investigate the coherent and incoherent production of vector meson in UPCs, as well as to probe the nuclear structure in heavy ion collisions.http://link.springer.com/article/10.1007/JHEP10(2020)064Heavy Ion PhenomenologyQCD Phenomenology |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hongxi Xing Cheng Zhang Jian Zhou Ya-Jin Zhou |
spellingShingle |
Hongxi Xing Cheng Zhang Jian Zhou Ya-Jin Zhou The cos 2ϕ azimuthal asymmetry in ρ 0 meson production in ultraperipheral heavy ion collisions Journal of High Energy Physics Heavy Ion Phenomenology QCD Phenomenology |
author_facet |
Hongxi Xing Cheng Zhang Jian Zhou Ya-Jin Zhou |
author_sort |
Hongxi Xing |
title |
The cos 2ϕ azimuthal asymmetry in ρ 0 meson production in ultraperipheral heavy ion collisions |
title_short |
The cos 2ϕ azimuthal asymmetry in ρ 0 meson production in ultraperipheral heavy ion collisions |
title_full |
The cos 2ϕ azimuthal asymmetry in ρ 0 meson production in ultraperipheral heavy ion collisions |
title_fullStr |
The cos 2ϕ azimuthal asymmetry in ρ 0 meson production in ultraperipheral heavy ion collisions |
title_full_unstemmed |
The cos 2ϕ azimuthal asymmetry in ρ 0 meson production in ultraperipheral heavy ion collisions |
title_sort |
cos 2ϕ azimuthal asymmetry in ρ 0 meson production in ultraperipheral heavy ion collisions |
publisher |
SpringerOpen |
series |
Journal of High Energy Physics |
issn |
1029-8479 |
publishDate |
2020-10-01 |
description |
Abstract We present a detailed study of vector meson photoproduction in ultraperipheral heavy ion collisions (UPCs). Using the dipole model, we develop a framework for the joint impact parameter and transverse momentum dependent cross sections. We compute the unpolarized cross section and cos 2ϕ azimuthal angular correlation for ρ 0 photoproduction with ϕ defined as the angle between the ρ 0’s transverse momentum and its decay product pion meson’s transverse momentum. Our result on unpolarized coherent differential cross section gives excellent description to the STAR experimental data. A first compari- son between theoretical calculation and experimental measurement on the cos 2ϕ azimuthal asymmetry, which results from the linearly polarized photons, is performed and reasonable agreement is reached. We find out the characteristic diffractive patterns at both RHIC and LHC energies and predict the impact parameter dependent cos 2ϕ azimuthal asymmetries for ρ 0 photoproduction by considering UPCs and peripheral collisions. The future experimental measurements at RHIC and LHC relevant to our calculations will provide a tool to rigorously investigate the coherent and incoherent production of vector meson in UPCs, as well as to probe the nuclear structure in heavy ion collisions. |
topic |
Heavy Ion Phenomenology QCD Phenomenology |
url |
http://link.springer.com/article/10.1007/JHEP10(2020)064 |
work_keys_str_mv |
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