hep-ex papers | Gist.Science

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.

Axion search with telescope for radio astronomy (ASTRA): forecast for observations between 0.5 and 4~GHz

This paper forecasts that the ASTRA project, utilizing a 5-meter radio telescope at Fan Mountain Observatory to observe neutron stars between 0.5 and 4 GHz, can significantly improve constraints on axion-like particles by exploring new parameter space for axion-photon couplings, particularly if a dark matter spike exists at the Galactic center.

Utkarsh Bhura, David J. E. Marsh, Bradley R. Johnson, Karl van Bibber, Mallory Helfenbein, Bradley J. Kavanagh, Matthew Nelson, Ciaran A. J. O'Hare, Giovanni Pierobon, Gray Rybka, Luca Visinelli2026-03-16⚛️ hep-ex

First measurement of time-dependent $CP$ violation in the decay flavor-changing neutral-current decay $B^{0}\rightarrow K_{S}^{0}\mu^{+}\mu^{-}$

Using 9 fb⁻¹ of proton-proton collision data collected by the LHCb experiment, this study presents the first time-dependent CP violation measurement in the flavor-changing neutral-current decay $B^{0}\rightarrow K_{S}^{0}\mu^{+}\mu^{-}$ , determining the parameters $C$ and $S$ to be consistent with Standard Model predictions.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. Adefisoye, B. Adeva, M. Adinolfi, P. Adlarson, C. Agapopoulou, C. A. Aidala, Z. Ajaltouni, S. (…)2026-03-16⚛️ hep-ex

Polarized and un-polarized $\mathcal{R}_{K^*}$ in and beyond the SM

This paper investigates the potential of polarized and unpolarized lepton flavor universality ratios ( $R_{K^*}$ ) involving $\tau$ and $\mu$ leptons in $B \to K^* \ell^+ \ell^-$ decays as sensitive observables to discriminate between various New Physics models, finding that these values are within current experimental reach and could help distinguish between different theoretical extensions of the Standard Model.

Ishtiaq Ahmed, Saba Shafaq, M. Jamil Aslam, Saadi Ishaq2026-03-13⚛️ hep-ex

Dark-technicolour at colliders

This paper proposes a revitalized Dark Technicolor framework that embeds QCD-like dynamics to dynamically generate the Higgs mass while satisfying electroweak precision tests and resolving the flavor problem, predicting suppressed direct fermion couplings but promising discovery potential for techni-hadrons at future high-energy colliders through specific decay channels.

Gauhar Abbas, Vartika Singh, Neelam Singh2026-03-13⚛️ hep-ex

Constraints on Dark Matter Models from Supermassive Black Hole Evolution

This paper utilizes a semi-analytical model of galaxy and supermassive black hole evolution within the $\Lambda$ CDM paradigm to demonstrate that the observed stellar mass–black hole mass relation at high redshifts disfavours fuzzy dark matter fields with masses below $2.0\times 10^{-20}$ eV and warm dark matter particles with masses below 7.2 keV at the 95% confidence level.

John Ellis, Malcolm Fairbairn, Juan Urrutia, Ville Vaskonen2026-03-13⚛️ hep-ex

Studies of hadron spectroscopy at Belle and Belle II

Using a $1.6\,\mathrm{ab}^{-1}$ dataset from Belle and Belle II, this study reports the first evidence for the $h_b(2P)\to \Upsilon(1S)\eta$ transition and the exotic $P_{c\bar c s}(4459)^0 \to J/\psi\Lambda$ decay in $\Upsilon$ decays, while finding no support for other predicted bottomonium transitions.

S. Wallner2026-03-13⚛️ hep-ex

Measurement of $\pi^0$ Production in $\bar{\nu}_{\mu}$ Charged-Current Interactions in the NOvA Near Detector

The NOvA collaboration presents the most precise measurement to date of muon antineutrino-induced charged-current neutral pion production on a hydrocarbon target, finding that while results agree with GENIE predictions, other models underestimate the cross section in the $\Delta$ (1232) resonance region.

The NOvA Collaboration2026-03-13⚛️ hep-ex

Decoding the structure near the $\pi^+\pi^-$ mass threshold in $\psi(3686) \rightarrow J/\psi \pi^+\pi^-$ decays

Using dispersion theory to account for strong pion-pion final-state interactions, this study demonstrates that the substructure near the $\pi^+\pi^-$ threshold in $\psi(3686) \rightarrow J/\psi \pi^+\pi^-$ decays can be reproduced without invoking an extra resonance, attributing the observed dip primarily to a helicity-flip amplitude rather than the virtual exchange of the $Z_c(3900)$ state.

Yun-Hua Chen, Xiang-Kun Dong, Feng-Kun Guo, Christoph Hanhart, Bastian Kubis2026-03-13⚛️ hep-ex

Coherent Elastic Neutrino-Nucleus Scattering at the Japan Proton Accelerator Research Complex

This paper demonstrates that the Japan Proton Accelerator Research Complex (J-PARC) offers optimal conditions for Coherent Elastic Neutrino-Nucleus Scattering (CE $\nu$ NS) experiments, showing that current and developing detector technologies can achieve high-statistics measurements with significant sensitivity to various particle physics scenarios within the next few years.

J. I. Collar, Ivan Esteban, J. J. Gomez-Cadenas, M. C. Gonzalez-Garcia, L. Ji, L. Larizgoitia, C. M. Lewis, F. Monrabal, João Paulo Pinheiro, A. Simón, S. G. Yoon2026-03-13⚛️ hep-ex

Search for a massless particle beyond the Standard Model in the $\Xi^0\to\Lambda + \text{invisible}$ decay

Using a dataset of approximately $10^{10}$ $J/\psi$ events collected by the BESIII detector, this study reports the first search for a massless beyond-Standard-Model particle in the $\Xi^0\to\Lambda+\text{invisible}$ decay, finding no significant signal and establishing an upper limit on the branching fraction of $2.3 \times 10^{-4}$ at the 90% confidence level.

BESIII Collaboration, M. Ablikim, M. N. Achasov, P. Adlarson, X. C. Ai, C. S. Akondi, R. Aliberti, A. Amoroso, Q. An, Y. H. An, Y. Bai, O. Bakina, H. R. Bao, X. L. Bao, M. Barbagiovanni, V. Batozskaya (…)2026-03-13⚛️ hep-ex

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hep-ex

Axion search with telescope for radio astronomy (ASTRA): forecast for observations between 0.5 and 4~GHz

First measurement of time-dependent $CP$ violation in the decay flavor-changing neutral-current decay B0→KS0μ+μ−B^{0}\rightarrow K_{S}^{0}\mu^{+}\mu^{-}B0→KS0​μ+μ−

Polarized and un-polarized RK∗\mathcal{R}_{K^*}RK∗​ in and beyond the SM