1387 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.
This paper presents improved Standard Model predictions for the rare dilepton decays by leveraging recent advances in transition form factor calculations and a robust dispersive evaluation of subleading contributions, yielding precise branching fractions that reveal a mild tension with experimental data for and provide new constraints on physics beyond the Standard Model.
Using the SND detector at the VEPP-2000 collider, researchers measured the ratio of the neutron's timelike electric to magnetic form factors () in the center-of-mass energy range of 1890–2000 MeV, determining an average value of by analyzing the polar angle distribution of produced antineutrons.
Using 9 fb⁻¹ of proton-proton collision data collected by the LHCb detector, this study presents the first hadron collider measurement of the lepton flavour universality ratio in decays at high dilepton invariant mass, finding a value of that is consistent with Standard Model predictions.
This paper demonstrates that a future 10 TeV muon collider can significantly surpass current and projected LHC and FCC-ee limits by using detailed simulations of Higgs and top quark production processes to constrain dimension-6 SMEFT operators and probe new physics scales far beyond the LHC's reach.
This paper introduces GAPE, a genetic algorithm-powered evolution method that optimizes deep learning models for the PROSPECT experiment, achieving a nearly 2.8-fold improvement in signal-to-background ratio for reactor antineutrino identification while addressing and mitigating time-dependent training biases.
Using the complete Borexino dataset from 2007 to 2021, researchers established the most stringent experimental limits to date on the lifetime of nuclei against Pauli exclusion principle-forbidden transitions, setting lower bounds ranging from to years for various decay channels and deriving extremely tight upper limits on the relative strengths of such non-Paulian processes.
The NA62 experiment at CERN presents new physics searches using and decay data collected between 2016 and 2024, establishing upper limits on the branching ratio at the level and on the neutrino mixing element at the level to constrain various portal model scenarios including dark photons, scalars, ALPs, and heavy neutral leptons.
This paper evaluates and presents GEANT4 simulation results, alongside BINP beam test validations, for three silica aerogel-based RICH detector concepts (FARICH, Fresnel lens RICH, and fiber-based RICH) designed to achieve particle identification up to 30 GeV/c for future colliders like CEPC and FCC.
The CMS Collaboration reports a high-precision measurement of the W boson mass at 80,360.2 ± 9.9 MeV using 13 TeV proton-proton collision data, a result that agrees with Standard Model predictions and provides a stringent test against recent anomalies.
This paper proposes a minimal Standard Model extension introducing Lorentz Invariance Violation in the Z boson's dispersion relation and outlines a targeted search strategy for ATLAS and CMS to detect resulting mass shifts and sidereal modulations with a sensitivity of approximately to .