2610 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 a new real-time luminosity determination method for the upgraded LHCb experiment, implemented directly in the VELO detector's FPGA firmware using 40 MHz hit reconstruction, which achieves sub-percent statistical resolution and millisecond-level granularity during the 2024 physics run.
Using the CLAS12 detector at Jefferson Lab, researchers reported the first measurement of beam spin asymmetries for dihadrons in semi-inclusive deep inelastic scattering, employing a machine learning-based photon classifier to significantly enhance statistics and revealing a nonzero asymmetry sensitive to the twist-3 quark-gluon correlation PDF as well as the first experimental evidence for the isospin dependence of the helicity-dependent dihadron fragmentation function .
Using 136 fb of 13 TeV proton-proton collision data from the CMS detector, this study simultaneously measures the signal and searches for the process, finding the former consistent with Standard Model predictions while setting an observed upper limit on the charm quark Yukawa coupling modifier at 3.0 times its SM value.
This paper presents a sub-part-per-trillion precision measurement of the 2S-6P transition in atomic hydrogen that resolves discrepancies in the proton charge radius by confirming the muonic hydrogen value and validates the Standard Model and bound-state QED corrections to unprecedented levels of accuracy.
This paper demonstrates that likelihood-free Simulation-Based Inference, particularly the Neural Posterior Estimation method, offers a computationally efficient and accurate alternative to traditional MCMC for exploring high-dimensional Beyond the Standard Model parameter spaces, successfully inferring posterior distributions for both 5-parameter and 9-parameter pMSSM scenarios including dark matter constraints.
Using a sample of 2.7 billion events collected by the BESIII detector, this study reports the first observation of the decay via the intermediate state, measures its associated branching fraction, observes an isospin-violating decay involving the , and sets upper limits on production in these channels.
Using LHCb data corresponding to 9 fb⁻¹ of integrated luminosity, this paper reports the first observation of the decay and evidence for the decay, providing the first measurements of their branching fractions to advance the theoretical understanding of two-body baryonic meson decays.
This paper establishes a new benchmark for heavy-quark TMD resummation at the LHC by developing a framework that combines SCET and HQET to achieve NNLL' accuracy for the azimuthal decorrelation of boosted top quark pairs, a feat made possible by the first extraction of the two-loop ultra-collinear function.
This paper demonstrates that Big Bang nucleosynthesis constraints on GeV-scale heavy neutral leptons within the neutrino-extended Standard Model Effective Field Theory provide a crucial upper bound on the theory's cutoff scale for masses above 100 MeV, thereby defining specific target regions for future laboratory searches.
This report summarizes recent differential top quark cross-section measurements from the ATLAS and CMS experiments, highlighting that while no single theoretical model fully describes the data across all bins, higher-order perturbative QCD predictions offer an improved description.