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.

Search for Z' bosons decaying into charginos in final states with two oppositely charged leptons and missing transverse momentum in pp collisions at $\sqrt{s}$ = 13 TeV

Using 138 fb $^{-1}$ of proton-proton collision data at 13 TeV, the CMS experiment searched for massive leptophobic Z' bosons decaying into charginos in final states with two oppositely charged leptons and missing transverse momentum, finding no evidence of new physics and setting upper limits that exclude Z' boson masses up to approximately 3.5 TeV.

CMS Collaboration2026-03-12⚛️ hep-ex

Quantum state tomography, entanglement detection and Bell violation prospects in weak decays of massive particles

This paper presents a general method for reconstructing the spin density matrix of multi-particle systems from angular decay data using Bloch parameterization and Wigner-Weyl transforms, and applies it to Monte Carlo simulations of massive particle decays to propose measurements for detecting entanglement and Bell inequality violations.

Rachel Ashby-Pickering, Alan J. Barr, Agnieszka Wierzchucka2026-03-11⚛️ quant-ph

No Hiding in the Dark: Cosmological Bounds on Heavy Neutral Leptons with Dark Decay Channels

This paper demonstrates that introducing dark decay channels for sub-GeV heavy neutral leptons fails to evade cosmological constraints, as the resulting increase in extra radiation energy density actually strengthens Big Bang Nucleosynthesis bounds on their mixing angles.

P. S. Bhupal Dev, Quan-feng Wu, Xun-Jie Xu2026-03-11⚛️ hep-ph

Precision measurement of neutrino oscillation parameters with 10 years of data from the NOvA experiment

Using a dataset with double the previous exposure and improved analysis techniques, the NOvA experiment reports its most precise single-experiment constraints on atmospheric neutrino mass splitting and mixing parameters, showing a mild preference for the normal mass ordering that strengthens to 87% probability when combined with Daya Bay data.

NOvA Collaboration, S. Abubakar, M. A. Acero, B. Acharya, P. Adamson, N. Anfimov, A. Antoshkin, E. Arrieta-Diaz, L. Asquith, A. Aurisano, D. Azevedo, A. Back, N. Balashov, P. Baldi, B. A. Bambah, E. F (…)2026-03-11⚛️ hep-ex

Spectrum of Light Hexaquark States in Triquark-antitriquark Configuration

Using QCD sum rules, this paper investigates triquark-antitriquark hexaquark configurations to interpret the BESIII-observed $X(2075)$ and $X(2085)$ states, finding that two predicted $J^P=1^-$ candidates match the experimental masses while offering new predictions for $0^+$ and $0^-$ states and analyzing their decay modes.

Xuan-Heng Zhang, Sheng-Qi Zhang, Cong-Feng Qiao2026-03-11⚛️ hep-ph

Reconstruction of the Effective Energy-deposition Vertex of Muon Showers using PMT Waveform in a Large-scale Liquid Scintillator Detector

This paper proposes a novel waveform-based method that isolates shower components from muon tracks to reconstruct energy-deposition vertices in large-scale liquid scintillator detectors with high precision and efficiency, thereby enabling effective localized spatial vetoes to suppress cosmogenic backgrounds in experiments like JUNO.

Junwei Zhang, Yongpeng Zhang, Yongbo Huang, Jilei Xu, Junyou Chen, Yi Wang2026-03-11⚛️ hep-ex

New Bounds on Heavy QCD Axions from Big Bang Nucleosynthesis

This paper establishes robust upper bounds on heavy QCD axion lifetimes as low as 0.017 seconds by analyzing Big Bang Nucleosynthesis constraints on neutron-to-proton ratio modifications from hadronic decays, a limit that surpasses projected future CMB bounds and remains largely insensitive to hadronic uncertainties.

Tae Hyun Jung, Takemichi Okui, Kohsaku Tobioka, Jiabao Wang2026-03-11⚛️ hep-ph

High-Energy Decays and Weak Quantum Measurements

This paper proposes that high-energy particle decays function as informationally weak measurements of quantum spin, where decay kinematics serve as continuous pointer variables to reconstruct spin states and unify spin tomography with Aharonov-Vaidman measurement theory.

Alan J. Barr2026-03-11⚛️ quant-ph

Exploring muonphilic dark matter with the $Z_2$ -even mediator at muon colliders

This paper demonstrates that a future 3 TeV muon collider can decisively test the muonphilic dark matter hypothesis, which explains the Galactic Center GeV Excess, by projecting comprehensive exclusion limits across a wide range of mediator masses using four distinct search strategies with a $Z_2$ -even mediator.

Wanyun Chen, Haoqi Li, Chih-Ting Lu, Qiulei Wang2026-03-11⚛️ hep-ph

Weak Charge Form Factor Determination at the Electron-Ion Collider

This paper proposes that the Electron-Ion Collider (EIC) can significantly advance the determination of nuclear weak charge form factors by providing continuous momentum transfer data across a wide range of nuclei, thereby resolving theoretical degeneracies in neutron density distributions that current single-point fixed-target experiments cannot address.

Hooman Davoudiasl, Hongkai Liu, Sonny Mantry, Ethan T. Neil2026-03-11⚛️ hep-ph

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hep-ex

Search for Z' bosons decaying into charginos in final states with two oppositely charged leptons and missing transverse momentum in pp collisions at s\sqrt{s}s​ = 13 TeV