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Open research questions in High-Energy Particle Collisions Research

117 gap statements mined from High-Energy Particle Collisions Research papers in our 4.5M-paper local library, which holds 1,479 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • The standard approach based on QCD framework has limitations in explaining the mass-energy structure of quarks. There is a need for an alternative electromagnetic mechanism to reproduce the low-energy phenomenology of QCD.

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

  • Future research can focus on improving the accuracy of the location of fluctuation-dominated critical end points. Future research can focus on studying the QCD phase diagram using other methods. Future research can focus on determining the critical couplings of SU(3) pure gauge theory using other methods.

    From deconfinement to nuclear matter: mean-field approaches for effective Polyakov loop theories of lattice QCD · 2026 · DOI

  • The sign problem in Monte Carlo evaluations of lattice QCD at non-zero baryon chemical potential µB is a gap. The lack of analytical methods to determine the phase diagram of lattice QCD with heavy quarks is a gap.

    From deconfinement to nuclear matter: mean-field approaches for effective Polyakov loop theories of lattice QCD · 2026 · DOI

  • Further studies can use the results to inform the development of new theoretical models. The study of the quark-gluon plasma can be extended to other collision systems.

    Constraining hot and cold nuclear matter properties from heavy-ion collisions and deep-inelastic scattering · 2026 · DOI

  • The extraction of transport properties of the quark-gluon plasma is a key question. The understanding of the early-time transport properties of nuclear matter under extreme conditions is limited.

    Constraining hot and cold nuclear matter properties from heavy-ion collisions and deep-inelastic scattering · 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 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 applicability of the hydrodynamic description to small systems is still an open question. Including bulk viscosity and a realistic QCD EoS may modify the results.

    Opacity estimation of OO collision from CoMBolt-ITA hybrid · 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 analysis is limited to a specific kinematic bin, and the authors defer the analysis of other bins to future work. The paper mentions that the experimental data available so far from the HALL A and HALL B collaborations is limited, with only one data point for each of the structure functions and asymmetries for a given kinematic bin.

    Markov chain Monte Carlo (MCMC) based Likelihood Extraction of Chiral-Odd Compton Form Factors from Deeply Virtual Exclusive Experiments · 2026

  • Future research can include the analysis of other kinematic bins. Future research can include the application of the method to other exclusive scattering processes to extract Compton form factors.

    Markov chain Monte Carlo (MCMC) based Likelihood Extraction of Chiral-Odd Compton Form Factors from Deeply Virtual Exclusive Experiments · 2026

  • But more data points can be added between the two existing ones. If the QCD first-order phase transition or its critical endpoint is crossed by the system in heavy-ion collisions at energies within this gap, it can manifest as changes in the energy dependence of the temperature due to the latent heat of the transition.

    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 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

  • The study uses a simulation model (PYTHIA8) which may not fully capture the complexity of the hadronic phase. The analysis is limited to pp and p-Pb collisions. The study assumes that regeneration is negligible.

    Exploring hadronic rescattering effects on resonance productions in pp and p–Pb collisions with Pythia8 · 2026 · DOI

  • 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

  • To further develop the theoretical model based on Bridge Theory. To apply the model to other areas of particle physics. To experimentally verify the predictions made by the model.

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

  • To incorporate the scattering of charged pions induced by the Coulomb-interaction in EPOS3. To develop new methods for analyzing two-pion correlations. To make predictions for future experiments using the model.

    Three-dimensional sizes and shapes of pion emission in heavy-ion collisions · 2026 · DOI

  • The manuscript will undergo further editing before final publication, - There may be errors present which affect the content, - The study uses a specific density distribution function, - The analysis is based on a specific interaction…

    Quantitative predictions of alpha-charmonium correlation functions in high-energy collisions · 2026 · DOI

  • Experimental verification of the α-c ¯c correlation at facilities such as FAIR, NICA, HIAF, and J-PARC HI, - Further study of the N-c ¯c interaction and its relationship to the α-c ¯c interaction, - Investigation of the α-c ¯c system with different density distribution…

    Quantitative predictions of alpha-charmonium correlation functions in high-energy collisions · 2026 · DOI

  • The paper identifies a gap in the understanding of higher-order correlations between elliptic and triangular flow. The paper aims to explain the simplicity in the complex mathematical quantities for collisions at fixed impact parameter.

    Explaining higher-order correlations between elliptic and triangular flow · 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

  • 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

  • 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

Most-cited papers in High-Energy Particle Collisions Research

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Open questions raised by papers listed on this page include: (1) There is a need for an alternative electromagnetic mechanism to reproduce the low-energy phenomenology of QCD (“Derivation of the Strong Interaction Scenario in the Electromagnetic Framework…”, 2026); (2) Future research can focus on improving the accuracy of the location of fluctuation-dominated critical end points (“From deconfinement to nuclear matter: mean-field approaches for effective…”, 2026); (3) Future research can focus on improving the predictive performance of neural networks in regions of sparse data (“Physics-informed neural network (PINN) modeling of charged particle…”, 2026); (4) The excitation of multipole transitions by twisted photons has not been thoroughly explored (“Multipolar transitions excited by twisted photons in heavy quarkonia”, 2026); (5) The applicability of the hydrodynamic description to small systems is still an open question (“Opacity estimation of OO collision from CoMBolt-ITA hybrid”, 2026). 117 gap statements have been mined from High-Energy Particle Collisions Research papers in our 4.5M-paper local library, which holds 1,479 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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