2160 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.
The SUPAX prototype experiment successfully operated a 2 K copper cavity in a 12 T magnetic field to exclude axion-photon couplings down to GeV and dark photon kinetic mixing parameters above in the mass range around eV, demonstrating the viability of the full-scale haloscope design.
Using 138 fb of proton-proton collision data at 13 TeV, the CMS experiment searched for massive leptophobic Z' bosons decaying into charginos in final states with two oppositely charged leptons and missing transverse momentum, finding no evidence of new physics and setting upper limits that exclude Z' boson masses up to approximately 3.5 TeV.
This paper demonstrates that introducing dark decay channels for sub-GeV heavy neutral leptons fails to evade cosmological constraints, as the resulting increase in extra radiation energy density actually strengthens Big Bang Nucleosynthesis bounds on their mixing angles.
Using a dataset with double the previous exposure and improved analysis techniques, the NOvA experiment reports its most precise single-experiment constraints on atmospheric neutrino mass splitting and mixing parameters, showing a mild preference for the normal mass ordering that strengthens to 87% probability when combined with Daya Bay data.
Using QCD sum rules, this paper investigates triquark-antitriquark hexaquark configurations to interpret the BESIII-observed and states, finding that two predicted candidates match the experimental masses while offering new predictions for and states and analyzing their decay modes.
This paper establishes robust upper bounds on heavy QCD axion lifetimes as low as 0.017 seconds by analyzing Big Bang Nucleosynthesis constraints on neutron-to-proton ratio modifications from hadronic decays, a limit that surpasses projected future CMB bounds and remains largely insensitive to hadronic uncertainties.
This paper demonstrates that a future 3 TeV muon collider can decisively test the muonphilic dark matter hypothesis, which explains the Galactic Center GeV Excess, by projecting comprehensive exclusion limits across a wide range of mediator masses using four distinct search strategies with a -even mediator.
This paper proposes that spinning black holes in the Milky Way can act as persistent "scalar sirens" by ejecting light scalar particles via superradiant instability, thereby generating a detectable, high-velocity scalar background that offers a novel, independent probe of isolated black hole populations and scalar field properties.
This paper presents a comprehensive study of heavy flavor baryon spectroscopy using a quark-diquark effective mass formalism under two interaction scenarios, successfully predicting the masses of various states that align well with experimental and lattice QCD data by incorporating constituent masses, hyperfine interactions, and a mass-dependent binding energy term.
This paper proposes and analyzes a novel "synchrotron radiation power leveling" strategy for the Future Circular Collider (FCC-hh), where beam energy is dynamically adjusted during a physics store to manage heat loads from synchrotron radiation, thereby increasing both peak and integrated luminosity and significantly boosting the production rates of key physics processes like di-Higgs events.