⚛️ Category

hep-ex

2101 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.

⚛️ high-energy experiments

Search for higgsinos in compressed mass spectra using low-momentum tracks in $pp$ collisions at s=13\sqrt{s}=13 TeV with the ATLAS detector

Using 140 fb−1^{-1} of 13 TeV proton-proton collision data, the ATLAS experiment conducted two searches for higgsinos with compressed mass spectra by identifying low-momentum tracks from displaced pions or prompt leptons, setting new world-leading lower limits of 126 GeV on chargino masses for mass splittings between 0.3 and 2 GeV without observing any significant excess over Standard Model predictions.

ATLAS Collaboration2026-06-29
⚛️ high-energy experiments

Study of B+→μ+νμB^+ \to μ^+ ν_μ decays at Belle and Belle II

This paper presents the first Belle II measurement and an updated Belle measurement of the B+→μ+νμB^+\to\mu^+\nu_\mu branching fraction, combining them to achieve the most precise search to date with a 2.4σ\sigma significance and a 90% confidence level upper limit of 2.2×10−72.2\times10^{-7}.

Belle, Belle II Collaborations, :, M. Abumusabh, I. Adachi, K. Adamczyk, A. Aggarwal, L. Aggarwal, H. Ahmed, Y. Ahn, H. (…)2026-06-29
⚛️ nuclear experiments

Multiplicity dependence of the size of the common hadron emission source in pp collisions at the LHC

This paper presents a femtoscopic analysis of proton-proton correlations in minimum bias $pp$ collisions at s=13.6\sqrt{s}=13.6 TeV using a high-luminosity ALICE dataset, which enables the first simultaneous measurement of the hadron-emitting source size's dependence on multiplicity and transverse mass, revealing a distinct multiplicity trend compared to Pb-Pb collisions and demonstrating the robustness of the results across various nucleon-nucleon interaction models.

ALICE Collaboration2026-06-29
⚛️ high-energy experiments

Neural-Network extraction of TMDs with SIDIS data

This paper presents the first global analysis of unpolarized Transverse-Momentum-Dependent (TMD) distributions using a neural-network parametrization that simultaneously incorporates Drell-Yan and SIDIS data at N3^3LL accuracy, demonstrating that the inclusion of SIDIS data broadens the extracted TMDs while reducing uncertainties compared to Drell-Yan-only analyses and offering a model-independent framework for future high-precision experiments.

Matteo Cerutti2026-06-29
⚛️ high-energy experiments

Observation of structures in the J/ψ+ψ(2S)J/\psi +\psi(2S) mass spectrum with the ATLAS detector

Using 140 fb−1^{-1} of 13 TeV proton-proton collision data, the ATLAS experiment observes a significant excess near 6.9 GeV in the J/ψ+ψ(2S)J/\psi +\psi(2S) mass spectrum with a combined significance of 8.9σ\sigma, while finding no significant signal near 7.2 GeV and determining the ratio of partial decay widths between the J/ψ+ψ(2S)J/\psi +\psi(2S) and di-J/ψJ/\psi channels for the 6.9 GeV resonance.

ATLAS Collaboration2026-06-26
⚛️ high-energy experiments

Are Subleading Effects Really Subleading? BB-Meson Decays in Mesogenesis

This paper calculates inclusive BB-meson decay rates within the Mesogenesis framework using the Heavy Quark Expansion, revealing that subleading power-suppressed contributions can exceed the leading term in specific parameter regions, thereby exposing the limits of the expansion's validity while updating exclusive decay bounds and finding no new constraints from lifetime ratios.

Ali Mohamed2026-06-26