⚛️ Category

hep-ex

1442 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.

Search for Higgs boson exotic decays into Lorentz-boosted light bosons in the four-τ\tau final state at s=13\sqrt{s}=13 TeV with the ATLAS detector

Using 140 fb−1^{-1} of 13 TeV proton-proton collision data collected by the ATLAS detector, this paper presents a search for exotic Higgs boson decays into a pair of light scalars that subsequently decay into four τ\tau-leptons, finding no significant excess over Standard Model predictions and setting 95% confidence level upper limits on the signal strength between 0.03 and 0.10 for scalar masses between 4 and 15 GeV.

ATLAS Collaboration2026-05-21⚛️ hep-ex

Intrinsic Properties of Large CP Violation in the Complex Two-Higgs-Doublet Model

This paper investigates the parameter space for large CP violation in the complex two-Higgs-doublet model, revealing that Type-I scenarios predict eEDM values within next-generation experimental reach due to gauge-sector CPV, while Type-II models allow for nearly maximal Yukawa-sector CPV suppressed to negligible eEDM levels through destructive interference, alongside a newly identified "hidden CPV" phenomenon in the near-alignment limit that can be probed at future colliders.

Soojin Lee, A. Hammad, Dongjoo Kim, Jeonghyeon Song2026-05-21⚛️ hep-ex

Study of the thermodynamic properties of hot QCD matter with the CMS experiment

This paper presents recent CMS measurements at the LHC that extract the squared speed of sound of hot QCD matter from ultra-central PbPb collisions, yielding a value of cs2=0.241±0.002 (stat)±0.016 (syst)c_s^2 = 0.241 \pm 0.002\, (\mathrm{stat}) \pm 0.016\, (\mathrm{syst}) at Teff≈219 MeVT_{\mathrm{eff}} \approx 219\,\mathrm{MeV} which aligns well with lattice-QCD predictions, alongside complementary studies in pPb collisions to probe quark-gluon plasma signatures in smaller systems.

Cesar A. Bernardes2026-05-21⚛️ hep-ex

Impact of Hadronic Resonances on B→K(∗)τ+τ−B\to K^{(*)}\tau^+\tau^- decays

This paper proposes a data-driven strategy to predict B→K(∗)τ+τ−B\to K^{(*)}\tau^+\tau^- decays by explicitly incorporating hadronic resonance contributions, such as those from ψ(2S)\psi(2S), rather than avoiding them, thereby enabling the use of hadron-collider data and enhancing sensitivity to large New Physics effects across the full kinematic spectrum.

Guillermo Baltà, Andreas Crivellin, Rafel Escribano, Joaquim Matias, Martín Novoa-Brunet2026-05-21⚛️ hep-lat

Statistical sensitivity of neutrinoless double-beta decay exchange mechanism discrimination by tracking experiments

This paper demonstrates that tracking experiments can effectively discriminate between different neutrinoless double-beta decay exchange mechanisms with high statistical significance using only a few well-reconstructed events, even in the presence of realistic reconstruction uncertainties, thereby validating the continued pursuit of tracking detectors for discovery-class experiments.

Jason Detwiler, Ke Han, Tao Li2026-05-21⚛️ hep-ex

Sensitivity of the FCC-ee to axion-like particles at different center-of-mass energies

This paper investigates the sensitivity of the proposed FCC-ee collider to axion-like particles (ALPs) coupling to electroweak gauge bosons across all planned center-of-mass energies, demonstrating that the facility can detect ALPs with couplings as low as a few 10−6GeV−110^{-6} \mathrm{GeV}^{-1} via the three-photon final state and potentially probe their electroweak structure for masses below the Z-boson mass.

Juliette Alimena, Elnura Bakhishova, Freya Blekman, Jannah Darwish Abdelhafiz, Christina Dorofeev, Jeremi Niedziela, Giacomo Polesello, Anna Przybyl, Lovisa Rygaard2026-05-21⚛️ hep-ex

CP violation in K→μ+μ−K\toμ^+μ^- with and without time dependence through a tagged analysis

This paper proposes a method to extract short-distance information and resolve discrete ambiguities in the Standard Model prediction for KL0→μ+μ−K^0_L \to \mu^+\mu^- by analyzing time-integrated and time-dependent CP asymmetries, demonstrating that an LHCb-like experiment could constrain the relevant short-distance amplitude to within 35% of its Standard Model value and resolve the ambiguity at over 3σ\sigma significance.

Giancarlo D'Ambrosio, Avital Dery, Yuval Grossman, Teppei Kitahara, Radoslav Marchevski, Diego Martínez Santos, Stefan Schacht2026-05-20⚛️ hep-ex