⚛️ Category

hep-ex

1434 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.

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⚛️ hep-ph

Probing Type-I 2HDM light Higgs in the top-pair-associated diphoton channel

Motivated by the 95 GeV diphoton excess, this study evaluates the discovery potential of a light Higgs boson in the Type-I Two-Higgs-Doublet Model via the top-pair-associated diphoton channel, demonstrating that while direct searches constrain the mixing angle α\alpha, future colliders like the HL-LHC, HE-LHC, and FCC-hh can probe significant regions of the parameter space, particularly for sin⁡(β−α)\sin(\beta-\alpha) values away from zero, with the FCC-hh offering the most comprehensive sensitivity.

Yabo Dong, Kun Wang, Jingya Zhu2026-03-03⚛️ hep-ex

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⚛️ hep-ex

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. Bakina, Y. Ban, H. -R. Bao, V. Batozskaya, K. Begzsuren, N. Berger, M. Berlowski, M. (…)2026-03-03⚛️ hep-ex

Large Relativistic Corrections to Nonrelativistic M1M1 Transitions in Heavy Quarkonium

This paper demonstrates that contrary to the common assumption of small relativistic effects in heavy quarkonium, relativistic corrections to nonrelativistic M1M1 transitions are unexpectedly large, ranging from approximately 66% to 83% for both charmonium and bottomonium decays, as revealed by a comprehensive Bethe-Salpeter equation analysis including higher-order multipole contributions.

Su-Yan Pe, Wei Li, Wen-Yuan Ke, Yi-Yi Rui, Qiang Li, Guo-Li Wang2026-03-03⚛️ hep-ex

Ionization and temperature measurements in warm dense copper using x-ray absorption spectroscopy

This study utilizes x-ray absorption spectroscopy at the OMEGA Laser Facility to measure ionization states and temperatures of warm dense copper plasmas at 15–25 g/cm³ and 10–21 eV, providing critical experimental data to refine theoretical models for this regime.

T. Cordova, E. V. Marley, D. A. Chin, R. A. London, H. A. Scott, M. K. G. Kruse, T. Döppner, F. N. Beg, F. Coppari, M. Millot, J. Emig, S. B. Hansen, P. M. Nilson, P. Sterne, M. J. MacDonald2026-03-03⚛️ hep-ex

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, Joel B. Coley, Teruaki Enoto, Alice K. Harding, Wynn C. G. Ho, Chin-Ping Hu, Philip (…)2026-03-03⚛️ hep-ex

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⚛️ nucl-ex