⚛️ Category

hep-ex

2585 papers

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

A New Source of Millicharged Particles: Secondary Showers in the LHC Forward Absorber

This paper identifies and quantifies a significant new source of millicharged particles at the LHC, demonstrating that secondary showers in the forward TAXN absorber can enhance the expected signal yield for the proposed FORMOSA detector by approximately 50% for light masses, thereby establishing downstream production as a critical component for realistic sensitivity projections in future high-luminosity searches.

Jyotismita Adhikary, Peiran Li, Zhen Liu, Sebastian Trojanowski, Azam Zabihi2026-05-15
⚛️ high-energy experiments

Double Metric Learning for Building Directed Graphs with Chain Connections for the ATLAS ITk Detector

This paper proposes a "Double Metric Learning" approach that learns two distinct node representations to resolve conflicts in constructing directed graphs with chain connections for the ATLAS ITk detector, demonstrating improved performance in graph construction and edge direction prediction for high transverse momentum particles compared to simple metric learning.

Jay Chan2026-05-15
⚛️ high-energy experiments

Constraints on anomalous Higgs boson couplings to vector bosons and fermions using the γγ\gamma\gamma final state in proton-proton collisions at s\sqrt{s} = 13 TeV

Using 138 fb−1^{-1} of proton-proton collision data at s\sqrt{s} = 13 TeV collected by the CMS experiment, this study constrains anomalous Higgs boson couplings to vector bosons and fermions via the diphoton decay channel, finding results consistent with Standard Model expectations.

CMS Collaboration2026-05-15
⚛️ high-energy experiments

Search for new physics in triple boson production in proton-proton collisions at s\sqrt{s} = 13 TeV using the effective field theory approach

This paper presents a search for new physics in proton-proton collisions at 13 TeV via triple boson production using the effective field theory approach, where no excess over Standard Model expectations was observed, leading to stringent 95% confidence level bounds on dimension-6 and -8 Wilson coefficients.

CMS Collaboration2026-05-15
⚛️ nuclear experiments

Characterization of nuclear breakup as a function of hard-scattering kinematics using dijets measured by ATLAS in pp+Pb collisions

Using 8.16 TeV pp+Pb collision data from the ATLAS detector, this study demonstrates that event geometry estimators based on forward energy deposition are sensitive to the initial-state hard-scattering kinematics, specifically showing a strong dependence on the proton-side parton's Bjorken-xx that is significantly more pronounced in the Forward Calorimeter than in the Zero-Degree Calorimeter.

ATLAS Collaboration2026-05-14
⚛️ high-energy experiments

Historical origins of quantum entanglement in particle physics

This paper systematically investigates the historical origins of quantum entanglement in particle physics, highlighting key milestones such as the 1949 Wu-Shaknov experiment, the 1957 theoretical work by Lee, Oehme, and Yang on neutral kaons, and the 1958 Goldhaber-Lee-Yang formulation of entangled kaon pairs, which collectively established entanglement in both photon and high-energy particle systems prior to Bell's inequality.

Yu Shi2026-05-14
⚛️ high-energy experiments

Sensitivity to low-mass WIMPs with an improved liquid argon ionization response model within the DarkSide programme

By integrating new ReD calibration data with existing DarkSide-50, ARIS, and SCENE results to refine the liquid argon ionization response model for nuclear recoils, this study establishes new world-leading exclusion limits on low-mass WIMPs in the 1–3 GeV/c² range and demonstrates significantly enhanced discovery potential for the upcoming DarkSide-20k detector.

F. Acerbi, P. Adhikari, P. Agnes, I. Ahmad, S. Albergo, I. F. Albuquerque, T. Alexander, A. K. Alton, P. Amaudruz, M. An (…)2026-05-14
⚛️ high-energy experiments

Atmospheric Neutrino Charged-Current Interactions at Large Liquid-Scintillator Detectors: I. Physics of Neutrino-Antineutrino Discrimination

This paper presents a systematic study of atmospheric neutrino-antineutrino discrimination in large liquid-scintillator detectors by analyzing event characteristics such as inelasticity and neutron multiplicity, thereby establishing a foundation for determining the neutrino mass ordering through oscillation studies.

Xinhai He, Gao-song Li, Yu-Feng Li, Wuming Luo, Liang-jian Wen2026-05-14
⚛️ phenomenology

Determining the Spin-Analyzing Powers via Invariants of the Spin Correlation Matrices and Probing the Bell Non-Locality at the Lepton Colliders

This paper establishes that the trace of the spin correlation matrix is a basis-invariant quantity for two-fermion production via single mediator exchange at lepton colliders, enabling the determination of spin-analyzing powers, the reconstruction of spin correlations to probe Bell non-locality (specifically in ΛΛˉ\Lambda \bar{\Lambda} production at BESIII), and the exploration of new physics beyond the Standard Model.

Dianwei Wang, Xiqing Hao, Liwei Liu, Lina Wu, Tianjun Li2026-05-14
⚛️ high-energy experiments

Pulse shape discrimination for α\alpha event rejection in BEGe-type high-purity germanium detectors

This study demonstrates that pulse shape discrimination classifiers trained exclusively on gamma-ray data can effectively identify and reject alpha events in high-purity germanium detectors, offering a robust background suppression strategy for next-generation neutrinoless double beta decay searches like LEGEND where dedicated alpha training data is insufficient.

Alex Biondi, Krzysztof Szczepaniec, Tomasz Mróz, Marcin Misiaszek, Grzegorz Zuzel2026-05-14