⚛️ Category

hep-ex

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.

⚛️ high-energy experiments

Search for a narrow resonance with a mass between 10 and 70 GeV decaying to a pair of photons in proton-proton collisions at s\sqrt{s} = 13 TeV

Using 54.4 fb−1^{-1} of 13 TeV proton-proton collision data from the CMS experiment, a search for narrow resonances decaying to diphotons in the 10–70 GeV mass range found no significant excess over the expected background, leading to the setting of upper limits on production cross sections and an interpretation within an axion-like particle framework.

CMS Collaboration2026-03-04
⚛️ phenomenology

Evidence of isospin-symmetry violation in high-energy collisions of atomic nuclei: Theoretical and Phenomenological considerations

This paper extends the theoretical and phenomenological analysis of recent NA61/SHINE collaboration findings by establishing the conceptual and analytical foundations of isospin symmetry and proving that, under charge-symmetry invariant initial conditions, the mean multiplicities of charged and neutral kaons should be equal, thereby highlighting the significance of the observed violation.

Wojciech Brylinski, Marek Gazdzicki, Francesco Giacosa, Mark Gorenstein, Roman Poberezhnyuk, Subhasis Samanta2026-03-03
⚛️ high-energy experiments

Search for additional scalar bosons within the Inert Doublet Model in a final state with two leptons at the FCC-ee

This paper presents a projected search for additional scalar bosons within the Inert Doublet Model at the FCC-ee, utilizing a parametric neural network to analyze final states with two leptons at 240 and 365 GeV, demonstrating the potential to exclude nearly the entire available parameter space and discover new scalars with masses up to 110 and 165 GeV respectively.

Anubha Bal, Edward Curtis, Anne-Marie Magnan, Benedikt Maier, Tania Robens, Nicholas Wardle2026-03-03
⚛️ high-energy experiments

Measurement of the ηη transition form factor through η′→π+π−ηη' \rightarrow π^+π^-η decay

Using a large sample of J/ψJ/\psi events collected by the BESIII experiment, this study extracts the η\eta transition form factor slope and branching fractions for η→γe+e−\eta \to \gamma e^+e^- and η→γμ+μ−\eta \to \gamma \mu^+\mu^- decays via the η′→π+π−η\eta' \to \pi^+\pi^-\eta channel, combines these results with previous measurements to improve precision, and sets new upper limits on dark photon production without observing a significant signal.

BESIII Collaboration, M. Ablikim, M. N. Achasov, P. Adlarson, X. C. Ai, R. Aliberti, A. Amoroso, Q. An, Y. Bai, O. Bakin (…)2026-03-03
⚛️ high-energy experiments

Evidence of magnetospheric vacuum birefringence in the polarized X-rays of a radio magnetar

This study presents the first observational evidence for magnetospheric vacuum birefringence, a key prediction of quantum electrodynamics, by analyzing the high and energy-dependent X-ray polarization of the radio magnetar 1E 1547.0--5408 using data from IXPE, NICER, and Parkes.

Rachael E. Stewart, Hoa Dinh Thi, George Younes, Marcus E. Lower, Matthew G. Baring, Michela Negro, Fernando Camilo, Joe (…)2026-03-03
⚛️ nuclear experiments

Leptonic first-row correlation and unitarity waiting for further JUNO tests

The paper conjectures a remarkable correlation among the first-row elements of the lepton mixing matrix, ∣Ue1∣2=2(∣Ue2∣2+∣Ue3∣2)|U_{e1}|^2 = 2(|U_{e2}|^2 + |U_{e3}|^2), which remains consistent with unitarity limits and is currently supported by JUNO and Daya Bay precision measurements at nearly the 1σ1\sigma confidence level.

Zhi-zhong Xing2026-03-03
⚛️ nuclear experiments

Automated event generation for S-wave quarkonium and leptonium production in NRQCD and NRQED

This paper presents an extension of the MadGraph5_aMC@NLO framework that enables automated leading-order calculations for S-wave quarkonium and leptonium production within NRQCD and NRQED formalisms, offering seamless integration with Beyond the Standard Model scenarios and highlighting the necessity of careful theoretical analysis beyond simple velocity-scaling rules.

Alice Colpani Serri, Chris A. Flett, Jean-Philippe Lansberg, Olivier Mattelaer, Hua-Sheng Shao, Lukas Simon2026-03-03
⚛️ high-energy experiments

How Bright in Gravitational Waves are Millisecond Pulsars for the Galactic Center GeV Gamma-Ray Excess? A Systematic Study and Implications for Dark Matter

This study systematically investigates the gravitational wave emission from a population of millisecond pulsars proposed to explain the Galactic Center GeV gamma-ray excess, concluding that while current detectors cannot observe them, next-generation instruments like the Einstein Telescope and Cosmic Explorer may detect these signals to definitively test the pulsar versus dark matter interpretations of the excess.

Ming-Yu Lei, Bei Zhou, Xiaoyuan Huang2026-03-03