hep-ex papers | Gist.Science

Hep-Ex explores the fascinating intersection where particle physics meets experimental reality. This field investigates how scientists build massive detectors and accelerate particles to test the fundamental laws of nature, turning abstract theories into measurable data. It is the rigorous process of searching for new particles or forces that could reshape our understanding of the universe, often requiring years of collaboration and engineering.

At Gist.Science, we ensure these discoveries become accessible to everyone. We process every new preprint in this category directly from arXiv, generating both plain-language explanations for curious readers and detailed technical summaries for specialists. Our goal is to bridge the gap between complex experimental results and public understanding without losing scientific nuance.

Below are the latest papers in Hep-Ex, freshly summarized and ready for you to explore.

⚛️ phenomenology

Singlet-Doublet fermion origin of dark matter, neutrino mass and inverse first-order electroweak phase transition

This paper proposes a scotogenic model extending the Standard Model with singlet-doublet fermions and right-handed neutrinos to simultaneously explain dark matter, Dirac neutrino masses, and an inverse first-order electroweak phase transition that produces observable gravitational waves, with its parameter space testable by future collider, direct-detection, and cosmological experiments.

Debasish Borah, Indrajit Saha, Sujit Kumar Sahoo, Narendra Sahu, Shashwat Sharma2026-08-14

⚛️ high-energy experiments

Amplitude analysis of $B^+ \!\to K^+ \pi^+ \pi^-$ decays

Using 3 fb $^{-1}$ of LHCb data, this paper reports the most precise measurements of branching fractions and $C\!P$ -violating asymmetries for intermediate states in $B^+ \!\to K^+ \pi^+ \pi^-$ decays by employing three complementary amplitude analysis approaches to model dominant S-wave contributions, thereby providing new insights into strong dynamics and $C\!P$ violation.

LHCb collaboration, R. Aaij, M. Abdelfatah, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. (…)2026-08-14

⚛️ high-energy experiments

Resolution of outstanding puzzles in $B^+ \!\to K^+ \pi^+ \pi^-$ decays

Based on an amplitude analysis of LHCb data, this paper resolves longstanding puzzles in $B^+ \!\to K^+ \pi^+ \pi^-$ decays by relaxing unitarity assumptions to achieve better model-data agreement, thereby eliminating the need for ad-hoc scalar components, reversing previous conclusions about dominant decay modes to align with QCD factorisation, and enabling the discovery of ten new intermediate decays.

LHCb collaboration, R. Aaij, M. Abdelfatah, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. (…)2026-08-14

⚛️ high-energy experiments

Observation of several sources of $C\!P$ violation in $B^+ \!\to K^+ \pi^+ \pi^-$ decays

Using 3 fb⁻¹ of LHCb collision data from 2011–2012, this amplitude analysis of $B^+ \!\to K^+ \pi^+ \pi^-$ decays reports the first observation of six distinct $C\!P$ -violating phenomena, including discoveries in quasi-two-body decays, amplitude-level effects, and significant interference between partial waves.

LHCb collaboration, R. Aaij, M. Abdelfatah, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. (…)2026-08-14

⚛️ high-energy experiments

High-precision measurement of the space-like $\eta^\prime$ transition form factor

Using a $20.3\ \text{fb}^{-1}$ data sample collected by the BESIII detector, this study presents a high-precision measurement of the space-like $\eta^\prime$ transition form factor over the $Q^2$ range of $0.1$ to $6.0\ \text{GeV}^2$ , achieving uncertainties better than $3.0\%$ for $Q^2 < 1.5\ \text{GeV}^2$ and providing the first direct determination below $0.3\ \text{GeV}^2$ .

BESIII Collaboration, M. Ablikim, M. N. Achasov, P. Adlarson, X. C. Ai, C. S. Akondi, R. Aliberti, A. Amoroso, Q. An, Y. (…)2026-08-14

⚛️ high-energy experiments

Fine-tuned Normalizing Flows for ALICE Zero Degree Calorimeter Fast Simulation

This paper presents a generative surrogate framework using fine-tuned Normalizing Flows with transfer learning to efficiently simulate the ALICE Zero Degree Calorimeter's responses to various particles, introducing physics-motivated metrics to validate its superior performance over traditional Monte Carlo methods.

Emilia Majerz, Jacek Otwinowski, Witold Dzwinel, Jacek Kitowski2026-08-14

⚛️ high-energy experiments

Newtrinos.jl: A Julia Package for Global Analysis of Neutrino Data

Newtrinos.jl is an open-source, modular Julia package that enables flexible, parallelizable, and automatically differentiable global analyses of neutrino data by integrating diverse experimental datasets with various physics models through a unified statistical framework supporting both Frequentist and Bayesian inference.

Philipp Eller, David Schultheiß2026-08-14

⚛️ high-energy experiments

MANGO: An Autodiff Neutrino Oscillation Engine for Differentiable Analysis Pipelines

This paper introduces MANGO, a fully differentiable neutrino oscillation engine that enables efficient, end-to-end gradient-based analysis of complex propagation scenarios and experimental designs by computing sensitivities for all inputs—including Earth density profiles and detector parameters—with minimal computational overhead.

Pierre Granger2026-08-14

⚛️ high-energy experiments

An Oxygen Target for (Anti)neutrinos

This paper proposes a method to utilize low-density detectors containing both oxygen and hydrogen targets to accurately characterize neutrino-oxygen interactions and measure nuclear effects and flux in-situ, thereby reducing key systematic uncertainties for long-baseline neutrino oscillation experiments.

R. Petti2026-08-13

⚛️ high-energy experiments

Upgrade of NaI(Tl) crystal encapsulation for the NEON experiment

This paper presents the successful upgrade of the NEON experiment's NaI(Tl) crystal encapsulation design, which resolved liquid scintillator leakage issues that previously caused noise and gain drops, thereby enabling stable long-term operation with an increased detector mass of 16.7 kg.

J. J. Choi, E. J. Jeon, J. Y. Kim, K. W. Kim, S. H. Kim, S. K. Kim, Y. D. Kim, Y. J. Ko, B. C. Koh, C. Ha, B. J. Park, S (…)2026-08-13

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hep-ex

Singlet-Doublet fermion origin of dark matter, neutrino mass and inverse first-order electroweak phase transition

Amplitude analysis of B+ ⁣→K+π+π−B^+ \!\to K^+ \pi^+ \pi^-B+→K+π+π− decays

Resolution of outstanding puzzles in B+ ⁣→K+π+π−B^+ \!\to K^+ \pi^+ \pi^-B+→K+π+π− decays

Observation of several sources of C ⁣PC\!PCP violation in B+ ⁣→K+π+π−B^+ \!\to K^+ \pi^+ \pi^-B+→K+π+π− decays

High-precision measurement of the space-like η′\eta^\primeη′ transition form factor

Fine-tuned Normalizing Flows for ALICE Zero Degree Calorimeter Fast Simulation

Newtrinos.jl: A Julia Package for Global Analysis of Neutrino Data

MANGO: An Autodiff Neutrino Oscillation Engine for Differentiable Analysis Pipelines

An Oxygen Target for (Anti)neutrinos

Upgrade of NaI(Tl) crystal encapsulation for the NEON experiment

Amplitude analysis of $B^+ \!\to K^+ \pi^+ \pi^-$ decays

Resolution of outstanding puzzles in $B^+ \!\to K^+ \pi^+ \pi^-$ decays

Observation of several sources of $C\!P$ violation in $B^+ \!\to K^+ \pi^+ \pi^-$ decays

High-precision measurement of the space-like $\eta^\prime$ transition form factor