2511 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.
Using 138 fb of proton-proton collision data at = 13 TeV collected by the CMS experiment, this study presents the first constraint on the Higgs boson width derived from signal-background interference in the diphoton final state, establishing a 95% confidence level upper limit of 92 MeV.
This paper details the serial production, stringent quality control procedures, and construction of the small-diameter Muon Drift Tube (sMDT) chambers at MPI Munich, which are designed to replace the inner barrel MDTs in the ATLAS Muon Spectrometer to enhance performance for the High-Luminosity LHC upgrade.
This paper proposes that the high-energy event observed by LUX-ZEPLIN could be explained by fermionic dark matter absorption on xenon nuclei, but concludes that this interpretation is in significant tension with existing constraints from KamLAND neutron-emission data.
This paper presents recent results on strange hadron production in Au+Au collisions at = 3.2–4.5 GeV from the STAR Beam Energy Scan phase-II program, analyzing transverse momentum spectra, rapidity densities, and centrality dependence to compare with higher-energy data and transport model calculations for insights into baryon-rich nuclear matter.
This study demonstrates that bent silicon crystals can effectively steer sub-GeV electron beams and significantly enhance radiation emission through orientational coherent effects, achieving record channeling efficiencies above 50% at 300 MeV and confirming the feasibility of using such crystals for beam manipulation and high-intensity photon generation in low-energy accelerator facilities.
Although the AXIS mission was not selected for implementation, its mature instrument design serves as a benchmark demonstrating that a future AXIS-like X-ray observatory could improve existing dark matter decay lifetime limits by up to an order of magnitude in the keV mass range.
This paper introduces FTFT, a new set of Pythia8 parameters optimized for simulating open charm and beauty production in fixed-target collisions at GeV by fitting differential distributions to experimental data and applying beam-specific K-factors to improve predictions for neutrino fluxes and hidden-particle yields in beam-dump experiments like SHiP.
This paper presents a comparative study of Higgs boson pair production in SMEFT at NLO QCD, demonstrating that while some Wilson coefficient scenarios remain valid under linear truncation, others with large anomalous couplings produce unphysical differential cross sections, thereby exposing the necessity of including quadratic dimension-6 contributions to accurately capture shape distortions in kinematic distributions.
This paper presents a Geant4-based simulation study evaluating the sensitivity of a proposed missing-mass search for a light dark photon () using a 500 MeV positron beam on a liquid-hydrogen target at Jefferson Lab, projecting a kinetic-mixing parameter sensitivity of for masses between 7 and 19 MeV.
The CMS experiment analyzed proton-proton collision data at 13 TeV to provide evidence for the dead-cone effect in bottom quark jets, observing a 4.3 standard deviation preference for a parton shower model that includes this mass-dependent suppression of collinear gluon emissions over one that does not.