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.

⚛️ high-energy experiments

A tunable photonic band gap resonator for axion dark matter searches

This paper presents the first tunable photonic band gap resonator for axion dark matter searches, demonstrating a proof-of-concept design that successfully confines the operating transverse magnetic mode while eliminating unwanted transverse electric modes to address mode crowding in existing haloscopes.

Samantha M. Lewis, Dillon T. Goulart, Mirelys Carcana Barbosa, Shriram Jois, Alexander F. Leder, Aarav M. Sindhwad, Isab (…)2026-08-24

⚛️ high-energy experiments

Search for a Higgs boson produced in association with a charm quark and decaying to a W boson pair in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Using 138 fb $^{-1}$ of 13 TeV proton-proton collision data collected by the CMS detector, this paper searches for Higgs bosons produced in association with a charm quark and decaying to a W boson pair, setting an observed 95% confidence level upper limit of $|\kappa_\mathrm{c}| < 211$ on the Higgs-charm Yukawa coupling strength modifier, which improves to $|\kappa_\mathrm{c}| < 47$ when combined with previous diphoton channel results.

CMS Collaboration2026-08-24

⚛️ phenomenology

First Search for Ultraheavy Dark Matter Using a Magnetically Levitated Particle

The POLONAISE experiment conducted the first search for ultraheavy dark matter using a magnetically levitated milligram-scale ferromagnet, setting leading constraints on dark matter-neutron interactions for masses between $10^6$ and $10^{15}\,\mathrm{GeV}/c^2$ and extending the reach of levitated sensing by seven orders of magnitude.

Dennis G. Uitenbroek, Dorian W. P. Amaral, Juehang Qin, Jurriaan Langendorff, Andrew Gingerich, Tjerk H. Oosterkamp, Chr (…)2026-08-24

⚛️ phenomenology

A window for the mixed same-sign signature in the type-II seesaw models

This paper demonstrates that electroweak loop corrections in type-II seesaw models fix the Higgs triplet mass splitting to a narrow range, which critically determines the branching ratio of the mixed same-sign decay channel $H^{\pm\pm} \to H^\pm W^{\pm(*)}$ and significantly shifts existing experimental exclusion boundaries depending on the quartic coupling $\lambda_4$ .

Cheng-Wei Chiang2026-08-24

⚛️ high-energy experiments

Evidence for $\eta_{c}(2S)\to p\bar{p}\pi^{+}\pi^{-}\pi^{0}$ and observation of $\chi_{cJ} \to p\bar{p}\pi^{+}\pi^{-}\pi^{0}$

Using a large sample of $\psi(3686)$ events collected by the BESIII detector, this study reports evidence for the decay $\eta_{c}(2S)\to p\bar{p}\pi^{+}\pi^{-}\pi^{0}$ and provides the first observation of $\chi_{cJ} \to p\bar{p}\pi^{+}\pi^{-}\pi^{0}$ decays with significantly improved precision measurements of their branching fractions and those of the intermediate $\chi_{cJ}\to p\bar{p}\omega$ processes.

BESIII Collaboration, M. Ablikim, M. N. Achasov, P. Adlarson, X. C. Ai, C. S. Akondi, R. Aliberti, A. Amoroso, Q. An, Y. (…)2026-08-24

⚛️ phenomenology

The ABC of RPV III: Classification of R-parity Violating Signatures from LQD Couplings and their Coverage at the LHC

This paper presents a systematic study of R-parity violating $LQ\bar{D}$ operators in the MSSM, classifying their collider signatures and evaluating current LHC coverage to reveal substantial sensitivity in the colored sector while identifying significant gaps for wino- and higgsino-like LSPs with $\tau$ -involving couplings and for directly produced slepton LSPs.

Herbi K. Dreiner, Yong Sheng Koay, Tina Potter, Martin Schürmann, Rhitaja Sengupta, Apoorva Shah, Nadja Strobbe2026-08-24

⚛️ high-energy experiments

Angular analysis of the decay ${\it \Lambda}_{\it b}^{0} \to {\it \Lambda}(1520){\it \mu^{+}\mu^{-}}$

Using 9 fb $^{-1}$ of proton-proton collision data from the LHCb detector, this paper presents the first angular analysis of ${\it \Lambda}_{\it b}^{0} \to {\it \Lambda}(1520){\it \mu^{+}\mu^{-}}$ decays, measuring key angular observables that are found to be in good agreement with Standard Model predictions.

LHCb collaboration, R. Aaij, M. Abdelfatah, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. (…)2026-08-24

⚛️ high-energy experiments

Implications of two-channel rescattering for charm CP violation from precise dispersive data

This paper demonstrates that even with optimized inputs and precise dispersive data, the two-channel rescattering mechanism remains insufficient to explain the large CP violation observed in charm-meson decays within the Standard Model, while also providing new constraints on CP asymmetries through sum rules.

Antonio Pich, Eleftheria Solomonidi, Luiz Vale Silva2026-08-24

⚛️ high-energy experiments

On-Detector Machine Learning for Beam-Induced Background Rejection at a 10 TeV Muon Collider

This paper demonstrates that lightweight neural networks implemented directly on the vertex detector can effectively reject 88–90% of beam-induced background while maintaining 99% signal efficiency, offering a viable hardware-compatible strategy for managing readout constraints at a future 10 TeV Muon Collider.

Daniel Abadjiev, Eliza Howard, Tsz Ngong You, Ryan Michaud, Benjamin Ryan Roberts, Benjamin Rosser, Karri Folan Di Petri (…)2026-08-24

⚛️ high-energy experiments

Construction of the $a_4$ family

This paper investigates the mass spectra and strong decays of the $a_4$ family using the modified Godfrey-Isgur quark model and the quark-pair creation model, suggesting that the recently observed $a_4(2610)$ resonance is a promising candidate for the $a_4(2H)$ state while also predicting the properties of the $a_4(1H)$ and $a_4(3F)$ states.

Ya-Rong Wang, Cheng-Qun Pang, Hao Chen, Xiao-Hai Liu2026-08-21

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hep-ex

A tunable photonic band gap resonator for axion dark matter searches

Search for a Higgs boson produced in association with a charm quark and decaying to a W boson pair in proton-proton collisions at s\sqrt{s}s​ = 13 TeV

First Search for Ultraheavy Dark Matter Using a Magnetically Levitated Particle

A window for the mixed same-sign signature in the type-II seesaw models

Evidence for ηc(2S)→ppˉπ+π−π0\eta_{c}(2S)\to p\bar{p}\pi^{+}\pi^{-}\pi^{0}ηc​(2S)→ppˉ​π+π−π0 and observation of χcJ→ppˉπ+π−π0\chi_{cJ} \to p\bar{p}\pi^{+}\pi^{-}\pi^{0}χcJ​→ppˉ​π+π−π0

The ABC of RPV III: Classification of R-parity Violating Signatures from LQD Couplings and their Coverage at the LHC

Angular analysis of the decay Λb0→Λ(1520)μ+μ−{\it \Lambda}_{\it b}^{0} \to {\it \Lambda}(1520){\it \mu^{+}\mu^{-}}Λb0​→Λ(1520)μ+μ−

Implications of two-channel rescattering for charm CP violation from precise dispersive data

On-Detector Machine Learning for Beam-Induced Background Rejection at a 10 TeV Muon Collider

Construction of the a4a_4a4​ family

Search for a Higgs boson produced in association with a charm quark and decaying to a W boson pair in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Evidence for $\eta_{c}(2S)\to p\bar{p}\pi^{+}\pi^{-}\pi^{0}$ and observation of $\chi_{cJ} \to p\bar{p}\pi^{+}\pi^{-}\pi^{0}$

Angular analysis of the decay ${\it \Lambda}_{\it b}^{0} \to {\it \Lambda}(1520){\it \mu^{+}\mu^{-}}$

Construction of the $a_4$ family