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.
Using the 15-year NANOGrav data, this work constrains inflationary parameters and the reheating phase, finds a preference for a blue-tilted tensor spectrum and a radiation-like reheating phase, simultaneously demonstrates that observations favor a specific non-Bunch-Davies alpha-vacuum, and suggests that frequency-dependent modifications of this vacuum could resolve the blue-tilt problem.
This article proposes a low-reheating cosmological scenario in which light dark matter particles are produced via kaon decays and scatterings mediated by a flavor-changing operator, thereby establishing a testable connection between the dark matter relic abundance and the search for rare kaon decays in experiments such as NA62 and KOTO.
This work presents a comprehensive lattice-QCD determination of the flavor-singlet and strange axial form factors of the nucleon using CLS gauge configurations with -improved Wilson fermions, providing a complete error budget for the extrapolations with respect to chiral symmetry, the continuum limit, and infinite volume, with a specific focus on the treatment of discontinuous contributions.
This paper presents sensitivity projections demonstrating that the IceCube Upgrade will significantly enhance the detection of low-mass dark matter annihilation (3–500 GeV) from the Sun and Galactic Center, potentially achieving leading constraints on such models within three years of data collection.
Using 13 TeV proton-proton collision data from the LHCb experiment, this study reports the first search for decays, finding no evidence of signals and establishing the first upper limits on their branching fractions at the 90% confidence level.
Using the QCD sum rule method, this paper investigates the masses, decay widths, and dominant decay channels of the hypothetical scalar molecules () and (), predicting them to be strong-interaction unstable particles with masses of approximately 15.7 GeV and 9.7 GeV, respectively, to guide future experimental searches.
Using 140 fb of 13 TeV proton-proton collision data collected by the ATLAS detector, this study searches for electroweakino signatures in final states containing photons, jets, and missing transverse momentum, finding no significant excess over Standard Model predictions and setting exclusion limits on gaugino masses up to 1.2 TeV.
This contribution presents updated bounds on operators of the Standard Model effective field theory (SMEFT) constrained by Higgs boson observables under various flavor assumptions, and demonstrates how precise Higgs measurements are becoming increasingly significant for establishing lower limits on new physics scales, while simultaneously emphasizing the importance of scale evolution and consistency with existing literature.
This contribution systematically investigates the phenomenology of fermionic top partners in exotic color-sextet representations within composite Higgs models, derives their decay patterns, and establishes current LHC exclusion limits up to 2.5 TeV as well as the projected sensitivity of the HL-LHC near 3 TeV.
This article summarizes compelling evidence for new Higgs bosons at approximately 95 GeV and 152 GeV and suggests that these electroweak-scale excesses—particularly in the two-photon channel and in specific production modes—could resolve tensions in the Standard Model and explain phenomena such as dark matter and neutrino masses.