First evidence of the decay
This paper reports the first search for the decay within the invariant mass range of $796$ to , resulting in a measured ratio of and no significant evidence of the decay.
⚛️ Category
hep-ex
1442 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.
Improved results on Higgs boson pair production in the 4b final state
Using proton-proton collision data at 13 and 13.6 TeV collected by the CMS experiment, this paper presents improved measurements of Higgs boson pair production in the 4b final state, achieving the most stringent constraints to date on the signal strength and Higgs self-couplings through advanced analysis techniques in both resolved and merged jet topologies.
Measurement of the top quark pair production cross section in PbPb collisions at = 5.36 TeV
The CMS experiment reports the first measurement of the inclusive top quark pair production cross section in lead-lead collisions at = 5.36 TeV, finding results consistent with next-to-next-to-leading order perturbative QCD predictions and providing the first investigation of top quark production dependence on collision impact parameter.
Optical effects in Gaseous Electron Multipliers (GEMs)
This paper investigates and quantifies a systematic optical broadening effect in Glass GEM-based Optical Time Projection Chambers, demonstrating through laboratory measurements and Geant4 simulations that scintillation light propagating through the GEM substrate significantly increases track intensity and width, thereby explaining discrepancies observed in the MIGDAL experiment.
Search for light charged Higgs bosons decaying to charm and strange quarks in events in proton-proton collisions at = 13 TeV
Using 138 fb of proton-proton collision data at 13 TeV, this study presents the first direct search for light charged Higgs bosons decaying to charm and strange quarks in top quark pair events, setting the most stringent limits to date on the branching fraction (t H b) for masses between 70 and 110 GeV while finding no evidence of a signal beyond Standard Model predictions.
Optimisation of a silicon-tungsten electromagnetic calorimeter energy response to photons
This paper presents a reoptimization of the silicon-tungsten electromagnetic calorimeter (SiW-ECAL) design for future circular colliders by developing machine learning-based reconstruction methods that significantly improve energy resolution and correct energy leakage.
semileptonic sum rule: orbitally excited hadrons
This paper constructs and analyzes semileptonic sum rules for transitions involving orbitally excited charm hadrons, finding that while deviations from the small-velocity limit and tensor contributions are significant, robust predictions for lepton-universality ratios currently require better-constrained hadronic form factors.
The DAMSA Experiment
This paper outlines the DAMSA experiment, a novel short-baseline accelerator/beam dump proposal designed to probe MeV-to-sub-GeV dark-sector messengers and rare Standard Model signals by overcoming traditional sensitivity limits through an ultra-short baseline and a compact, background-mitigated detector, with its feasibility to be validated by the proposed DAMSA Path-Finder proof-of-concept experiment at SLAC.
Deeply virtual pion production through two-loop order
This paper presents the first calculation of next-to-next-to-leading order (NNLO) QCD radiative corrections for deeply virtual pion production, demonstrating that these two-loop corrections substantially improve the agreement between perturbative QCD predictions and experimental data from JLab while also refining theoretical descriptions of transverse single-spin asymmetries for future facilities like the EIC and EicC.
Weak nuclear decays deep-underground as a probe of axion dark matter
This paper proposes using time modulation in weak nuclear decays as a probe for axion dark matter, deriving a theoretical framework to predict such variations, constraining axion parameters using existing Gran Sasso data on K and Cs, and suggesting a new electron capture measurement to extend sensitivity to higher axion masses.