Ratios of collective flow observables in high-energy isobar collisions are insensitive to final state interactions

Abstract

The ratios of bulk observables, such as harmonic flow $v_2$ and $v_3$, between high-energy ${}^{96}$Ru+${}^{96}$Ru and ${}^{96}$Zr+${}^{96}$Zr collisions were recently argued to be a clean probe of the nuclear structure differences between ${}^{96}$Ru and ${}^{96}$Zr. Using a transport model simulation of isobar collisions, we quantify this claim from the dependence of the ratios $v_{2,\mathrm{Ru}}/v_{2,\mathrm{Zr}}$ and $v_{3,\mathrm{Ru}}/v_{3,\mathrm{Zr}}$ on various final state effects, such as the shear viscosity, hadronization and hadronic cascade. Although the $v_2$ and $v_3$ change by more than 50% when varying the final state effects, the ratios are unchanged. In addition, these ratios are independent of the transverse momentum $p_{\mathrm{T}}$ and hadron species, despite of up to a factor of two change in $v_n$. The ratio of mean transverse momentum $⟨p_{\mathrm{T}}⟩$ is found to be controlled by the nuclear skin and nuclear radius, but is only slightly impacted by the final state effects. Therefore, these isobar ratios serve as a clean probe of the initial condition of the quark-gluon plasma, which in turn is controlled by the collective structure of the colliding nuclei.

6 pages and 6 figures, replaced with version accepted by PRC

References in corpus (14)

• Glauber Modeling in High Energy Nuclear Collisions
• Alternative ansatz to wounded nucleon and binary collision scaling in high-energy nuclear collisions
• Multi-system Bayesian constraints on the transport coefficients of QCD matter
• A transverse momentum differential global analysis of Heavy Ion Collisions
• Evidence of quadrupole and octupole deformations in ${}^{96}$Zr+${}^{96}$Zr and ${}^{96}$Ru+${}^{96}$Ru collisions at ultra-relativistic energies
• Shape of atomic nuclei in heavy ion collisions
• Probing triaxial deformation of atomic nuclei in high-energy heavy ion collisions
• Evidence of the triaxial structure of ${}^{129}$Xe at the Large Hadron Collider
• Probing the neutron skin with ultrarelativistic isobaric collisions
• Measurement of the azimuthal anisotropy of charged-particle production in Xe+Xe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44$ TeV with the ATLAS detector
• Probing nuclear quadrupole deformation from correlation of elliptic flow and transverse momentum in heavy ion collisions
• Accessing the shape of atomic nuclei with relativistic collisions of isobars
• Anisotropic flow and flow fluctuations for Au + Au at $\sqrt{s_{NN}}$ = 200 GeV in a multiphase transport model
• Impact of event activity variable on the ratio of observables in isobar collisions

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• Examination of nucleon distribution with Bayesian imaging for isobar collisions
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• Impact of initial fluctuations and nuclear deformations in isobar collisions
• Effect of nuclear structure on particle production in relativistic heavy-ion collisions using the AMPT model
• Determining the neutron skin thickness by relativistic semi-isobaric collisions
• Deformation probes for light nuclei in their collisions at relativistic energies
• Nuclear cluster structure effect in ${}^{16}$O+${}^{16}$O collisions at the top RHIC energy
• Momentum dependent flow correlations in deformed nuclei at collision energies available at the BNL Relativistic Heavy Ion Collider
• An overview of new measurements of flow, chirality, and vorticity from STAR experiment
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• Benchmarking nuclear matrix elements of $0\nu \beta \beta$ decay with high-energy nuclear collisions
• Exploring Rapidity-Even Dipolar Flow in Isobaric Collisions at RHIC
• Impact of the pre-equilibrium phase for the determination of nuclear geometry in high-energy isobar collisions