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Open research questions in Particle physics theoretical and experimental studies

267 unresolved questions extracted from the limitations and future-work sections of 710 Particle physics theoretical and experimental studies papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Inconsistent hadronic modelling in post-fit combinations. The need for improved external constraints on form factors entering signal and background descriptions. The challenge of simulating sample precision, feed-down, and double-charm background control.

    Joint LHCb–Belle II prospects to constrain new physics in $$B\rightarrow D^{(*)}\tau \nu $$ · 2026 · DOI

  • The background composition is intentionally streamlined relative to the full experimental measurements, - Sub-dominant sources that are not needed for the sensitivity studies, or that are largely shape-degenerate in the observables used here, are omitted, - The analysis is based on simulated samples

    Joint LHCb–Belle II prospects to constrain new physics in $$B\rightarrow D^{(*)}\tau \nu $$ · 2026 · DOI

  • Further studies on the theoretical uncertainties for the decay widths of Z → J/ψ + Υ(nS) (n = 1, 2, 3) are needed. Investigations on the correlations between the heavy-quark masses, the LDMEs, and q2Hi could provide more insights.

    Next-to-leading order QCD and relativistic corrections to $$Z \rightarrow J/\psi +\Upsilon (nS)$$ · 2026 · DOI

  • further investigation of the 2HDMcT model, - analysis of the Run 3 data from ATLAS and CMS, - exploration of other BSM scenarios

    Unified interpretation of 95 GeV excesses in the two Higgs doublet type II seesaw model · 2026 · DOI

  • This comprehensive approach allows detailed studies of nucleon structure in the resonance region and provides important constraints on weak interaction form factors, where modern neutrino-nucleon data remain limited.

    Single pion production off free nucleons: Analysis of photon-, electron-, pion-, and neutrino-induced processes · 2026 · DOI

  • We also find that self-supervised Momentum Contrast (MoCo) pretraining improves the model initialization, particularly when the amount of labeled training data is limited.

    Comparison of image processing models in quark-gluon jet classification · 2026 · DOI

  • We also find that self-supervised Momentum Contrast (MoCo) pretraining improves the model initialization, particularly when the amount of labeled training data is limited.

    Comparison of image processing models in quark-gluon jet classification · 2026 · DOI

  • Consequently, the propagation and estimation of systematic uncertainties in NN-based models remain an open challenge.

    Uncovering hidden systematics in neural network models for high energy physics · 2026 · DOI

  • Machine learning models trained to optimise significance-based metrics can produce unstable decision thresholds and inconsistent results across validation splits, potentially affecting the robustness of experimental conclusions.

    Improving Stability of Discovery Significance in Higgs Boson Event Classification using Contrastive Representation Learning · 2026 · DOI

  • This establishes when separate sector descriptions are insufficient and what additional relational information is required for joint reconstruction.

    The Bosonic Carrier–Response–Projection Atlas · 2026 · DOI

  • Using a sample of (10087±44)×10^{6} J/ψ events, which is about 45 times larger than that was previously analyzed, a further investigation on the J/ψ→γ3(π^{+}π^{-}) decay is performed.

    Observation of the Anomalous Shape of X(1840) in J/ψ→γ3(π+π−) Indicating a Second Resonance Near pp¯ Threshold · 2024 · DOI

  • The impact of different Regge behaviors on EFT bounds is not well understood. The assumption of t-channel dominance has not been previously explored in this context.

    Adding subtractions: Comparing the impact of different Regge behaviors · 2026 · DOI

  • The Standard Model does not provide a first-principles derivation of the muon-electron mass ratio. A closed-form derivation of a dimensionless constant to three significant figures would be notable.

    Algebraic derivation of the muon-electron mass ratio $m_\mu/m_e$ from discrete geometric boundaries · 2026 · DOI

  • Theoretical uncertainties in SMEFT interpretations. Truncation ambiguities in the SMEFT expansion. The need for careful consideration of dimension-eight effects.

    Indirect Probes of Electroweak Interactions in the Top-Quark Sector: Recent SMEFT Results from CMS · 2026 · DOI

  • Global SMEFT interpretations at the High-Luminosity LHC. Further studies of CP-odd observables in the top-quark sector. Investigations of the flavor structure of electroweak SMEFT couplings.

    Indirect Probes of Electroweak Interactions in the Top-Quark Sector: Recent SMEFT Results from CMS · 2026 · DOI

  • The management system is yet to be settled. International collaboration can be formally started once CEPC is approved in China.

    The future of Higgs boson physics · 2026 · DOI

  • The signature remains masked in low-energy systems due to thermal decoherence and hadronization. The extremely short lifetime of the top quark (≈ 5 • 10^-25 s) makes it challenging to investigate.

    Spectral Level-Repulsion in High-Energy Coupling Phases: The Meitner-Formalism · 2026 · DOI

  • Future research should focus on improving the analysis techniques for Higgs boson properties. Future research should focus on developing new algorithms for tau lepton reconstruction. Future research should focus on evaluating the performance of the TauFinder algorithm.

    Tau Lepton Reconstruction at the Muon Collider: Cross Section Measurement of the H → τ+τ− Process · 2026 · DOI

  • The study identifies a gap in the understanding of Higgs boson properties. The study identifies a gap in the reconstruction of tau leptons. The study identifies a need for improved analysis techniques.

    Tau Lepton Reconstruction at the Muon Collider: Cross Section Measurement of the H → τ+τ− Process · 2026 · DOI

  • The requirement for the full Run5 dataset. The lack of significant signal for the conservative scenario.

    Prospects for discovering strongly decaying doubly heavy $T_{bc}$ tetraquark states at LHCb · 2026 · DOI

  • The study is limited to the analysis of ZZ production via leptonic/hadronic channels. The use of machine learning algorithms may be affected by the quality of the training data.

    Probing neutral triple gauge couplings via <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>Z</mml:mi> <mml:mi>Z</mml:mi> </mml:math> production at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>−</mml:mo> </mml:msup> </mml:math> colliders with machine learning · 2026 · DOI

  • Further study of the nTGC form factors and their contributions to the scattering amplitude. Application of machine learning algorithms to other areas of collider physics. Analysis of the ZZ production via other channels.

    Probing neutral triple gauge couplings via <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>Z</mml:mi> <mml:mi>Z</mml:mi> </mml:math> production at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>+</mml:mo> </mml:msup> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>−</mml:mo> </mml:msup> </mml:math> colliders with machine learning · 2026 · DOI

  • Future measurements can be improved by reducing the muon momentum calibration uncertainty. Future measurements can be improved by reducing the PDF uncertainties.

    High-precision measurement of the W boson mass with the CMS experiment · 2026 · DOI

  • The paper validates the SCETLIB + DYTURBO correction against standalone MINNLOPS predictions in Z → μμ events (Extended Data Fig. 5) but does not report comparison of the corrected pT predictions with alternative resummed calculations (MATRIX + RADISH, CuTe-MCFM) propagated through the full W boson mass extraction analysis with identical experimental systematics treatment, limiting quantification of theoretical prediction dependence on the specific resummation implementation.

    High-precision measurement of the W boson mass with the CMS experiment · 2026 · DOI

  • The paper suggests that future research should focus on the development of the μTRISTAN experiment. The paper highlights the need for further studies on the sensitivity of μTRISTAN to long lived scalars arising from exotic Higgs boson decays.

    Boosting long lived particles searches at μTRISTAN · 2026 · DOI

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267 open questions have been extracted from the limitations and future-work passages of 710 Particle physics theoretical and experimental studies 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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