⚛️ Category

hep-ex

1467 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.

Systematic study of flow of protons and light clusters in intermediate-energy heavy-ion collisions with momentum-dependent potentials

This study utilizes the PHQMD approach with a novel momentum-dependent potential to demonstrate that a soft, momentum-dependent nuclear equation of state best reproduces experimental flow data for protons and light clusters in intermediate-energy heavy-ion collisions, while also revealing distinct flow signatures that can help discriminate between different cluster formation mechanisms.

Viktar Kireyeu, Vadim Voronyuk, Michael Winn, Susanne Gläßel, Jörg Aichelin, Christoph Blume, Elena Bratkovskaya, Gabriele Coci, Jiaxing Zhao2026-04-17⚛️ nucl-ex

New physics searches via angular distributions of Bˉ→D∗(→Dπ)τ(→ℓντνˉℓ)νˉτ \bar{B} \to D^* (\to D \pi) \tau (\to \ell \nu_\tau \bar{\nu}_\ell) \bar{\nu}_\tau decays

This paper proposes a method to probe new physics in Bˉ→D∗τνˉτ\bar{B} \to D^* \tau \bar{\nu}_\tau decays by analyzing the angular distribution of the full cascade Bˉ→D∗(→Dπ)τ(→ℓντνˉℓ)νˉτ\bar{B} \to D^* (\to D \pi) \tau (\to \ell \nu_\tau \bar{\nu}_\ell) \bar{\nu}_\tau, demonstrating through simulated data that this approach can constrain right-handed and tensor current couplings with approximately 5–6% precision while incorporating recent lattice QCD form factor correlations.

Bhubanjyoti Bhattacharya, Thomas E. Browder, Alakabha Datta, Tejhas Kapoor, Emi Kou, Lopamudra Mukherjee2026-04-17⚛️ hep-ex

Effects of tau-neutrino detection on non-standard interactions at DUNE with a short discussion on the nature of neutrino mixing

This paper demonstrates that detecting tau neutrinos at the DUNE far detector significantly enhances sensitivity to Non-Standard Interactions, particularly the ϵμτ\epsilon_{\mu\tau} parameter, while also improving constraints on mass hierarchy, CP violation, mixing octants, and the unitarity of the PMNS matrix.

Xin Yue Yu, Zishen Guan, William Dallaway, Ushak Rahaman, Nikolina Ilic2026-04-17⚛️ hep-th

NuGraph2 with Context-Aware Inputs: Physics-Inspired Improvements in Semantic Segmentation

This paper demonstrates that enriching the NuGraph2 architecture with physics-inspired, context-aware input features significantly improves semantic segmentation for underrepresented particles like Michel electrons in Liquid Argon Time Projection Chambers, outperforming auxiliary decoders and energy-based regularization due to the model's current hit-level limitations.

Vitor F. Grizzi, Margaret Voetberg, V Hewes, Giuseppe Cerati, Hadi Meidani2026-04-17⚛️ hep-ex

Observation of a threshold enhancement in the π+π−\pi^+\pi^- spectrum in ψ(3686)→π+π−J/ψ\psi(3686) \rightarrow \pi^{+}\pi^{-}J/\psi decays

Using a large sample of ψ(3686)\psi(3686) events collected by the BESIII detector, researchers discovered a statistically significant resonance-like structure near the π+π−\pi^+\pi^- mass threshold that is well-described by a QCD multipole expansion model incorporating S-D wave mixing, while standard chiral perturbation theory fails to reproduce this enhancement.

BESIII Collaboration, M. Ablikim, M. N. Achasov, P. Adlarson, X. C. Ai, R. Aliberti, A. Amoroso, Q. An, Y. Bai, O. Bakina, Y. Ban, H. -R. Bao, V. Batozskaya, K. Begzsuren, N. Berger, M. Berlowski, M. (…)2026-04-17⚛️ hep-ex

Search for heavy resonances decaying into four-lepton final states via light bosons in proton-proton collisions at s\sqrt{s} = 13 TeV

Using 138 fb−1^{-1} of 13 TeV proton-proton collision data from the CMS experiment, this study presents a search for heavy resonances decaying into four leptons via light intermediate bosons, employing novel techniques to identify collimated dilepton pairs and setting upper limits on the production cross section in the previously unexplored dilepton mass range of 0.4–15 GeV without observing any significant excess over background predictions.

CMS Collaboration2026-04-17⚛️ hep-ex

Expected Sensitivity of the Light Dark Matter eXperiment to Long-Lived Dark Photons and Axion-Like Particles

This paper presents a detailed simulation-based evaluation demonstrating that the Light Dark Matter eXperiment (LDMX) can achieve competitive sensitivity to long-lived, visibly decaying dark photons and axion-like particles, thereby complementing its primary search for invisible dark matter and significantly broadening its exploration of the sub-GeV dark sector.

Torsten Akesson, Clay Barton, Charles Bell, Elizabeth Berzin, Liam Brennan, Lene Kristian Bryngemark, Lincoln Curtis, Patill Daghlian, E. Craig Dukes, Valentina Dutta, Bertrand Echenard, Ralf Ehrlich (…)2026-04-17⚛️ hep-ex

Charmed baryon decays at BESIII

This paper summarizes recent BESIII results on charmed-baryon decays derived from the world's largest sample of Λc+Λˉc−\Lambda_c^+\bar{\Lambda}_c^- pairs, highlighting the observation of the rare semi-leptonic decay Λc+→ne+νe\Lambda_c^+\to ne^+\nu_e, the first measurement of the decay asymmetry in Λc+→Ξ0K+\Lambda_c^+\to\Xi^0K^+, and various branching fraction measurements and partial wave analyses.

Xudong Yu (on behalf of the BESIII Collaboration)2026-04-17⚛️ hep-ex