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

Conceptual Design of the Muonium-to-Antimuonium Conversion Experiment (MACE)

This paper presents the theoretical framework and detailed experimental design of the Muonium-to-Antimuonium Conversion Experiment (MACE), which aims to discover or constrain charged lepton flavor violation by searching for muonium-to-antimuonium conversion with a sensitivity of approximately 101310^{-13}.

Ai-Yu Bai, Hanjie Cai, Chang-Lin Chen, Siyuan Chen, Xurong Chen, Yu Chen, Weibin Cheng, Ling-Yun Dai, Rui-Rui Fan, Li Go (…)2026-02-02
⚛️ high-energy experiments

Measurement of time-dependent CPCP asymmetries in B0KS0π+πγB^0 \to K_{\rm S}^0 \: π^{+} π^{-} γ decays at Belle and Belle II

Using combined data from the Belle and Belle II experiments, this paper reports the first measurement of time-dependent CPCP asymmetry parameters (CC, SS, S+S^+, and SS^-) in B0KS0π+πγB^0 \to K_{\rm S}^0 \pi^+ \pi^- \gamma decays, yielding results consistent with zero within uncertainties.

Belle, Belle II Collaborations, :, M. Abumusabh, I. Adachi, L. Aggarwal, H. Ahmed, Y. Ahn, H. Aihara, N. Akopov, S. Algh (…)2026-02-02
⚛️ high-energy experiments

Beam-test evaluation of pre-production Low Gain Avalanche Detectors for the ATLAS High Granularity Timing Detector

This paper presents beam-test results demonstrating that pre-production Low Gain Avalanche Detectors for the ATLAS High Granularity Timing Detector meet all performance requirements, including charge collection, time resolution, and hit efficiency, even after neutron irradiation simulating end-of-life High Luminosity-LHC conditions.

A. Aboulhorma, M. Ait Tamlihat, H. M. Alfanda, O. Atanova, N. Atanov, I. Azzouzi, J. Barreiro Guimarães da Costa, T. Bea (…)2026-02-02
⚛️ high-energy experiments

Radiative Dirac Neutrino Masses from Modular S3S_3 Symmetry in an Axion Model

This paper proposes a unified KSVZ-type axion model incorporating modular S3S_3 symmetry and a global U(1)PQU(1)_{\rm PQ} symmetry to simultaneously explain the origin of radiative Dirac neutrino masses, the strong CP problem, and dark matter, while predicting a massless neutrino and testable signatures for charged lepton flavor violation and axion-photon coupling.

Sin Kyu Kang, Ranjeet Kumar, Hiroshi Okada2026-02-02