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RBRC Workshop: Physics Opportunities from the RHIC Isobar Run

Virtual Event

Virtual Event


The RHIC isobar experiment introduced a well-controlled running mode leading to a new discovery tool for nuclear physics with unprecedented precision. Since the isobar nuclei have the same mass number, deviation of ratios of any observables from unity will flag a non-trivial physics origin. Recent measurements from collisions of 96/44Ru and 96/40Zr nuclei indeed reveal significant deviation of ratios of several bulk observables from unity, such as v2, v3, mean transverse momentum, and multiplicity.

These precision data can generate substantial impacts on constraining the structure of nuclei and their event-by-event shape fluctuations as the initial state of heavy-ion collision systems. Analyses of additional observables, including flow fluctuations and correlations, identified particle spectra and anisotropy, HBT radii, electromagnetic (EM) probes, and jet production are ongoing. Many exciting results are expected to be released by the next Quark Matter conference in April 2022.

Given such an opportunity, we deem that a workshop gathering experts from both experiments and the theory community to discuss analysis strategies and make theoretical predictions is timely and will advance our understanding of the physics potential of the isobar dataset.

The goal of this workshop is to 1) explore and identify interesting observables and associated physics, 2) understand the required experimental precision and identify possible backgrounds, 3) call for theoretical predictions, and 4) identify interesting isobar species for possible future experiments.

The topics of the workshop focus on ratios of observables from the RHIC isobar experiment, for which we can achieve good precision, including:

  • Hydrodynamical flow and geometrical response, with a focus on connection to nuclear structure
  • Chiral Magnetic Effect (CME), vorticity, and effects of strong EM field
  • Longitudinal fluctuations and correlations related to the transport of conserved charges
  • Nuclear PDF and transition from collective flow to jet quenching


Event ID: B000003934

Contact Us
    • 08:50 09:00
      Welcome 10m
      Speakers: Chun Shen (Wayne State University) , Derek Teaney (Stony Brook) , Haiyan Gao (BNL) , Jia Jiangyong (stony brook university & BNL) , Zhangbu Xu (BNL)
    • 09:00 11:20
      Morning session
      • 09:00
        Imaging nuclear structure with hydrodynamics 40m
        Speaker: Giuliano Giacalone (IPhT - Saclay)
      • 09:40
        RHIC isobar results and implication on nuclear structure 30m
        Speaker: Haojie Xu (Huzhou University)
      • 10:10
        introduction and overview of nuclear shapes and radial structures 40m
        Speaker: Michael Bender (IP2I Lyon)
      • 10:50
        Quantum-number projection technique for nuclear structure 30m
        Speaker: Bally Benjamin
    • 11:20 11:40
      Break 20m
    • 11:40 14:00
      Afternoon Session
      Convener: Jean-Yves Ollitrault (IPhT Saclay)
      • 11:40
        Application of hydrodynamics in isobar collision 30m
        Speaker: Bjoern Schenke (BNL)
      • 12:10
        Nuclear shape observables and methods 30m
        Speaker: Jerry Draayer
      • 12:40
        Realistic nucleon configuration for heavy-ion initial-state 30m
        Speaker: Massimiliano Alvioli
      • 13:10
        Scaling approach to nuclear structure in isobar collisions 20m
        Speaker: Chunjian Zhang (stony brook university)
      • 13:30
        Probe nuclear structure in Ultra-Peripheral collisions 30m
        Speaker: Daniel Brandenburg (Brookhaven National Laboratory)
    • 14:00 15:00
      Discussion session: Are low-energy and high-energy measuring/calculating the same thing? 1h
      Speakers: Giuliano Giacalone (IPhT - Saclay) , Michael Bender (IP2I Lyon)
    • 09:00 11:40
      Morning session
      Convener: Bao-An Li
      • 09:00
        Overview of octupole deformation: what is it, where it is expected 40m
        Speaker: Luis Robledo
      • 09:40
        An overview of neutron skin physics from nuclear structure and reaction: method and implications 40m
        Speaker: Pawel Danielewicz (Michigan State University)
      • 10:20
        hydrodynamics and Bayesian Inferences in isobar 30m
        Speaker: Wilke van der Schee (Utrecht University)
      • 10:50
        Measuring neutron-skin thickness with forward/backward rapidity neutrons in ultracentral relativistic isobaric collisions 25m

        We propose that the forward/backward rapidity neutrons in ultracentral relativistic heavy-ion collisions can be a good probe of the neutron-skin thickness. With the initialization of nuclei based on the Skyrme-Hartree-Fock model or the relativistic mean-field model, the idea is illustrated from deexcitations of spectator matter by the GEMINI model. Sensitivity of neutron yields at forward/backward rapidities in peripheral collisions to the neutron-skin thickness suffers from the inaccurate theoretical calculation of the excitation energy for arbitrary nuclear clusters, while results in ultracentral collisions are free from this uncertainty. Taking the ratios of forward/backward rapidity neutrons in Zr to Ru systems and considering the possible deformation effect, our results can be compared to the corresponding experimental data to be announced, serving as a useful measurement of the neutron-skin thickness and thus the density dependence of the nuclear symmetry energy.

        Speaker: Jun Xu (Shanghai Advanced Research Institute, CAS)
      • 11:15
        LHC results and connection to nuclear structure 25m
        Speaker: You Zhou (Niels Bohr Institute)
    • 11:40 12:00
      Break 20m
    • 12:00 14:00
      Afternoon Session
      Convener: Berndt Mueller (BNL)
      • 12:00
        ab initio nuclear structure theory and connections to heavy-ion collisions 40m
        Speaker: Dean Lee
      • 12:40
        Initial shape engineering via final state correlations in (isobar) system scan 30m
        Speaker: Jacquelyn Noronha-Hostler (University of Houston)
      • 13:10
        Nuclear structure in high and low energy heavy-ion collisions 25m

        In this talk, investigations of nuclear structure effects such as neutron skin, deformations and nucleon-nucleon correlations in the initial state of high energy heavy-ion collisions are performed within the hadronic transport approach SMASH. In addition, the collective behaviour of low energy heavy-ion collisions and potential effects of nuclear structure are discussed. As an outlook, future opportunities to explore nucleon correlations in low energy collisions will be shown

        Speaker: Hannah Elfner (GSI, University Frankfurt)
      • 13:35
        Nuclear structure studies in heavy ion collisions at NICA 25m
        Speaker: Grigory Nigmatkulov
    • 14:00 15:00
      Discussion session: Future opporutnities for collaboration and experimental studies 1h

      what else could heavy-ion collisions measure?

      Speakers: Dean Lee, Wilke van der Schee (Utrecht University)
    • 09:00 11:40
      Morning session: Longitudinal dynamics and baryon stopping
      Convener: Thomas Schaefer
      • 09:00
        Interplay of equilibrium and non-equilibrium components from dynamical core-corona towards the RHIC isobar collisions 30m
        Speaker: Yuuka Kanakubo (Sophia University)
      • 09:30
        Probing longitudinal dynamics in isobar collisions with a hybrid approach 30m
        Speaker: Anna Schäfer (Frankfurt Institute for Advanced Studies)
      • 10:00
        Effects of hydrodynamic and initial longitudinal fluctuations on rapidity decorrelation of collective flow 20m
        Speaker: Azumi Sakai (Sophia University)
      • 10:20
        Effect of finite nuclear thickness and improving the AMPT model for isobar collisions 30m
        Speaker: Zi-Wei Lin (East Carolina University)
      • 10:50
        Trento initial condition for RHIC Isobar collisions 30m
        Speaker: Weiyao Ke (Los Alamos National Laboratory)
      • 11:20
        Comparing initial states of 96Ru+96Ru and 96Zr+96Zr collisions at 200 GeV using a LEXUS inspired model 20m
        Speaker: Aritra De
    • 11:40 12:00
      Break 20m
    • 12:00 14:00
      Afternoon session: Charge fluctuations, diffusion, and correlations
      Convener: Volker Volker Koch (MS70A-3307)
      • 12:00
        Local charge/baryon conservation in isobar collision 30m
        Speaker: Dmytro Oliinychenko (Lawrence Berkeley National Laboratory)
      • 12:30
        Charge fluctuations in isobar collisions and connections with latticeQCD 30m
        Speaker: Volodymyr Vovchenko (Lawrence Berkeley National Laboratory)
      • 13:00
        Relativistic fluid dynamics of multiple conserved charges 30m
        Speaker: Jan Fotakis (University of Frankfurt)
      • 13:30
        Balance function and charge fluctuations in the RHIC isobar collisions 30m
        Speaker: Christopher Plumberg (University of Illinois at Urbana-Champaign)
    • 14:00 15:00
      Discussion on conserved charge fluctuations and correlations 1h
      Speakers: Christopher Plumberg (University of Illinois at Urbana-Champaign) , Vladimir Skokov (North Caroline State University / RBRC)
    • 09:00 11:00
      Session I
      • 09:00
        Machine learning of nuclear shape in heavy-ion collisions 30m
        Speaker: LongGang Pang (Department of physics, UC Berkeley)
      • 09:30
        Longitudinal flow decorrelation with hydrodynamic fluctuations and nuclear deformation 30m
        Speaker: Koichi Murase
      • 10:00
        Flow and Spin polarization at RHIC isobar run 30m
        Speaker: Huichao Song (Peking)
      • 10:30
        Interplay between nuclear structure and chiral magnetic effect in isobar collisions 30m
        Speaker: Guoliang Ma (Fudan University)
    • 11:00 11:20
      Break 20m
    • 11:20 13:00
      Session II
      • 11:20
        EM fields in RHIC Isobar collisions 30m
        Speaker: Zhangbu Xu (BNL)
      • 11:50
        Experimental overview on CME search in the RHIC Isobar systems 40m
        Speaker: Prithwish Tribedy (BNL)
      • 12:30
        CME Baseline for RHIC Isobar Run 30m
        Speaker: Shuzhe Shi (mcgill university)
    • 13:00 14:00
      Discussion: Improving background calculations for CME search 1h
      Speakers: Jinfeng Liao (INDIANA UNIVERSITY) , Shuzhe Shi (mcgill university)