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Open research questions in High-Energy Particle Collisions Research

62 unresolved questions extracted from the limitations and future-work sections of 601 High-Energy Particle Collisions Research papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • To study the neutron skin of other nuclei using the imaging-by-smashing technique. To use other techniques to study the neutron skin of 48Ca. To improve the AMPT model to better describe the Quark-Gluon Plasma (QGP).

    Characterizing the neutron skin of $$^{48}$$Ca through collective flow at the CERN large hadron collider · 2026 · DOI

  • The paper identifies a gap in the rigorous justification of the gnocchi phase. The authors note that previous work on the liquid drop model has not provided a rigorous derivation of the gnocchi phase.

    Liquid Drop Model for Nuclear Matter in the Low Density Limit · 2026 · DOI

  • The complexity of simulating heavy-ion collisions. The need for a detailed understanding of the initial state and transport properties of the QGP medium.

    Longitudinal flow decorrelation in heavy-ion collision at RHIC energies using a multi-phase transport model · 2026 · DOI

  • The calculation of OPEC at back-to-back and collinear limits. The establishment of the factorization formalism for OPEC. The presentation of phenomenological predictions in the kinematic region relevant for the future Electron-Ion Collider.

    Exploring nuclear modification using one-point energy correlator at the electron-ion collider · 2026 · DOI

  • Future studies can explore the phase diagram using rotation as a probe. The study suggests that rotational susceptibility can be used to probe QCD thermodynamics in heavy-ion collisions.

    Rotational susceptibility of a hot and dense hadronic matter · 2026 · DOI

  • The existence of the critical endpoint is yet to be confirmed by experiments. The study aims to fill this gap by estimating rotational susceptibilities in a rotating hadron resonance gas.

    Rotational susceptibility of a hot and dense hadronic matter · 2026 · DOI

  • In a high-statistics Pythia sample, the shell variables are sparse and strongly non-Gaussian, and their covariance contains nonzero cross-shell structure spread over many modes.

    Jet-by-jet energy correlators as stochastic probes of the parton-to-hadron transition · 2026

  • Since EPOS4 has not been extensively studied for flow observables, this study thereby provides a non-trivial assessment of its collective dynamics.

    Scaling of soft QGP signatures in relativistic lead, xenon and oxygen collisions in EPOS4 · 2026

  • However, whether femtometer-scale droplets of QGP are produced in small systems at high energies remains a fundamental open question.

    Scaling of soft QGP signatures in relativistic lead, xenon and oxygen collisions in EPOS4 · 2026

  • The neutron skin of heavy nuclei is not well understood. The imaging-by-smashing technique has not been used to study the neutron skin of 48Ca.

    Characterizing the neutron skin of $$^{48}$$Ca through collective flow at the CERN large hadron collider · 2026 · DOI

  • The neutron assembly procedure (Section 8, Eq. 42) is introduced but the corresponding structure function behavior, mass energy ratio analysis, and predicted charge radius are not calculated or compared against experimental neutron properties, leaving the model's applicability to neutral hadrons incomplete.

    Derivation of the Strong Interaction Scenario in the Electromagnetic Framework of Bridge Theory · 2026 · DOI

  • The model predicts a proton charge radius of 0.8076 fm, which is lower than recent experimental measurements (0.8335 and 0.831 fm), and the explanation invoking absent external excitation remains qualitative; quantitative validation against the 2024 updated proton radius measurements is needed.

    Derivation of the Strong Interaction Scenario in the Electromagnetic Framework of Bridge Theory · 2026 · DOI

  • Future research can focus on improving the predictive performance of neural networks in regions of sparse data. Future research can explore the application of physics-informed neural networks to other areas of physics.

    Physics-informed neural network (PINN) modeling of charged particle multiplicity using the two-component framework in heavy-ion collisions: a comparison with data-driven neural networks · 2026 · DOI

  • The study identifies a gap in the predictive performance of neural networks in regions of sparse data. The study aims to improve the predictive performance of neural networks in regions of sparse data.

    Physics-informed neural network (PINN) modeling of charged particle multiplicity using the two-component framework in heavy-ion collisions: a comparison with data-driven neural networks · 2026 · DOI

  • Experimental searches for the excitation of multipole transitions in quarkonium systems. Further theoretical studies of the properties of quarkonia and the excitation of multipole transitions by twisted photons.

    Multipolar transitions excited by twisted photons in heavy quarkonia · 2026 · DOI

  • The excitation of multipole transitions by twisted photons has not been thoroughly explored. Theoretical descriptions of quarkonia have been successful, but many discrepancies between theoretical predictions and experimental results have been discovered.

    Multipolar transitions excited by twisted photons in heavy quarkonia · 2026 · DOI

  • The critical value of Nf for chiral symmetry restoration and deconfinement is not well understood. The QCD phase diagram for large N f is not well established.

    QCD phase diagram for large Nf : analysis from contact interaction effective potential · 2026 · DOI

  • The production mechanisms of nuclei in ultra high-energy collisions are not well understood. The coalescence and statistical thermal models have different predictions for the production of nuclei. There is a need for new measurements to distinguish between the two models.

    Confronting the production mechanisms of nuclei with deuteron and proton-triggered balance functions · 2026 · DOI

  • The experiment is limited by the availability of statistics. The analysis is restricted to a specific range of invariant masses. The freeze-out cocktail is simplified and does not include the ρ meson. The coarse-grained kinetic transport simulation is an approximation.

    Dileptons as a penetrating probe of high-$$\mu _\textrm{B}$$ matter · 2026 · DOI

  • Future experiments can build upon the results of this study to further investigate the properties of the QCD medium. The development of new methods for estimating the background in dilepton measurements can improve the accuracy of future experiments. The study of dilepton production in heavy-ion collisions at other energies and collision systems can provide further insight into the QCD medium.

    Dileptons as a penetrating probe of high-$$\mu _\textrm{B}$$ matter · 2026 · DOI

  • The paper suggests that the results may allow a direct check of whether the spin polarization data for hyperons and vector-mesons are driven by the same physical mechanism. Further research may be needed to fully understand the implications of the unified description of spin-1 and spin-1/2 particles.

    Spin Alignment, Tensor Polarizabilities, and Local Equilibrium for Spin-1 Particles · 2026 · DOI

  • The paper identifies a gap in the description of spin-1 particles in heavy-ion collisions. The paper notes that prior work has analyzed the measurements of spin polarization for hyperon and vector-meson results, but a unified description of spin-1 and spin-1/2 particles is lacking.

    Spin Alignment, Tensor Polarizabilities, and Local Equilibrium for Spin-1 Particles · 2026 · DOI

  • To extend the approach to other high-energy collisions, such as proton-nucleus collisions. To develop new jet substructure observables and analysis techniques. To improve the understanding of parton-medium interactions in heavy-ion collisions.

    Bottom-up approach to describe groomed jet data in heavy-ion collisions · 2026 · DOI

  • The theoretical interpretation of jet observables in heavy-ion collisions is complex due to the interplay of perturbative and non-perturbative effects. Competing explanations exist for the physical origin of medium-induced modifications. A minimal approach to compute groomed substructure observables is needed to simplify this scenario.

    Bottom-up approach to describe groomed jet data in heavy-ion collisions · 2026 · DOI

  • Further theoretical and experimental studies are needed to understand the mechanisms of isospin-symmetry violation. The development of new theoretical models of particle production in nuclear collisions is necessary. Experimental studies of charge-symmetry invariance in other particle production processes are required.

    Evidence of Isospin-Symmetry Violation in High-Energy Collisions of Atomic Nuclei: Theoretical and Phenomenological Considerations · 2026 · DOI

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62 open questions have been extracted from the limitations and future-work passages of 601 High-Energy Particle Collisions Research papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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