1404 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 demonstrates that QCD perturbation theory, by including only the leading terms in the expansion for production, is sufficient to resolve recent tensions between theoretical predictions and experimental data on spin correlations without requiring full non-relativistic resummation or bound-state effects.
Using a sample of events collected by the BESIII detector, this study reports the first observation of the decays with statistical significances exceeding and determines their branching fractions while finding no evidence of resonant structures in the or systems.
Using a large sample of events collected by the BESIII detector, this study reports the first observation and measurement of the cross sections for the and reactions via -nucleus scattering at an electron-positron collider.
This paper introduces an uncertainty-aware machine learning framework that successfully classifies the pole structures of hadronic scattering amplitudes, achieving high accuracy on synthetic data and inferring a four-pole structure for the state in experimental LHCb data.
To support the BES-II program at RHIC, the STAR experiment implemented a complementary dual real-time framework combining a High Level Trigger for online event selection and an Express Data Production system for rapid, near offline-quality reconstruction, enabling prompt physics analysis and demonstrating scalability for future high-luminosity experiments.
This paper presents state-of-the-art NNLO QCD predictions for heavy-quark pair production in direct photon fusion by applying the Local Unitarity formalism to handle infrared singularities and combining these results with NLO electroweak corrections and NLP Coulomb resummation for top, bottom, and charm quarks.
This paper demonstrates that considering axionlike particle production from the full electromagnetic shower in beam dump targets, rather than just primary beams or specific meson decays, yields order-of-magnitude enhancements in detectable signals, thereby significantly expanding the sensitivity reach of the SHiP and BDX experiments to previously unexplored regions of ALP parameter space.
CaloClouds3 is an ultra-fast, geometry-independent generative model that utilizes angular conditioning and position-agnostic training data to simulate photon showers across an entire high-granularity detector barrel, achieving a two-order-of-magnitude speedup over Geant4 while maintaining full compatibility with physics reconstruction chains.
Using 41.6 fb of 13 TeV proton-proton collision data collected by the CMS experiment in 2018, this study searches for low-mass hidden-valley dark showers via non-prompt muon pairs from Higgs boson decays, setting new upper limits on the branching fraction to dark partons and establishing first constraints on extended dark-shower models with dark photons.
Using 5 fb⁻¹ of proton-proton collision data at 13 TeV collected by the LHCb experiment, this study searches for long-lived heavy neutral leptons in B-meson decays to a muon-pion final state, finding no significant excess and setting new constraints on their mixing with muon neutrinos in the 1.6–5.5 GeV mass range for both lepton-number-conserving and violating scenarios.