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

Solar Reflection of Inelastic Dark Matter

This paper investigates how solar-reflected inelastic dark matter, which is accelerated by solar electrons, can produce detectable energy signals in terrestrial experiments, potentially allowing for new constraints on MeV-scale dark matter models.

Haipeng An, Haoming Nie2026-04-27

⚛️ high-energy experiments

$b\to s\ell^+\ell^- (\ell = e, \mu, \tau)$ and $b\to s\nu\bar\nu$ at Belle and Belle II

Using a combined dataset of $1.2~\mathrm{ab}^{-1}$ from Belle and Belle II, this paper explores rare $B$ meson decays involving leptons and neutrinos, including the first inclusive measurement of $B\to X_s\nu\bar\nu$ and searches for $\tau^+\tau^-$ final states.

Meihong Liu (on behalf of the Belle,Belle II collaborations)2026-04-27

⚛️ high-energy experiments

HGQ-LUT: Fast LUT-Aware Training and Efficient Architectures for DNN Inference

HGQ-LUT is a new LUT-aware training approach that enables fast, automated, and hardware-efficient deployment of neural networks on FPGAs by accelerating training by over 100 times and providing an end-to-end workflow for optimizing accuracy-resource trade-offs.

Chang Sun, Zhiqiang Que, Bakhtiar Zadeh, Qibin Liu, Kevin H. Alvarez, Wayne Luk, Maria Spiropulu2026-04-27

⚛️ high-energy experiments

Searches for light exotic scalar decays at the e $^+$ e $^-$ Higgs factory

This paper presents the expected sensitivity and cross-section limits for detecting light exotic scalars via the "scalar-strahlung" process at a 250 GeV International Linear Collider (ILC), utilizing both full and fast simulations for various decay channels.

Bartłomiej Brudnowski, Kamil Zembaczyński, Aleksander Filip Żarnecki2026-04-27

⚛️ high-energy experiments

Neutrino Masses and Phenomenology in Nnaturalness

This paper demonstrates that $N$ naturalness scenarios naturally suppress neutrino masses through a mechanism involving numerous mixing partners, leading to a specific tower of additional neutrino mass eigenstates that offers unique, testable signatures in terrestrial oscillation, mass, and neutrinoless double beta decay experiments, thereby extending the model's phenomenological reach beyond cosmology.

Manuel Ettengruber2026-04-24

⚛️ high-energy experiments

Improving systematic uncertainties on precision two-body mass measurements

This paper proposes a rigorous method for identifying and controlling detector-related systematic uncertainties in two-body mass measurements, demonstrating its application to the LHCb experiment's potential to improve the precision of the $\Lambda$ hyperon mass measurement by a factor of three to a total uncertainty of 2.2 keV/ $c^2$ .

Allison Chu, Yiming Liu, Matthew Needham2026-04-24

⚛️ nuclear experiments

Observation of suppressed charged-particle production in ultrarelativistic oxygen-oxygen collisions

Using data from the CMS detector at the CERN LHC, this study reports the first observation of suppressed charged-particle production in ultrarelativistic oxygen-oxygen collisions, evidenced by a nuclear modification factor below unity that supports the existence of parton energy loss in intermediate-sized nuclear systems.

CMS Collaboration2026-04-24

⚛️ high-energy experiments

Measurement of charged-hadron distributions in heavy-flavor jets in proton-proton collisions at $\sqrt{s}$ =13 TeV

The LHCb collaboration measured charged-hadron distributions in beauty and charm jets from 13 TeV proton-proton collisions, observing differences consistent with the dead-cone effect and hard fragmentation that provide new constraints on heavy-flavor hadronization mechanisms.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. Adefisoye, B. A (…)2026-04-24

⚛️ high-energy experiments

Searching for EeV photons with Telescope Array Surface Detector and neural networks

Using 14 years of Telescope Array Surface Detector data and a neural network classifier fine-tuned on experimental data to distinguish between proton- and photon-induced events, the study reports no significant photon candidates and establishes an updated upper limit on the diffuse ultra-high-energy photon flux above $10^{19}$ eV of $3.0 \cdot 10^{-4} \, (\text{km}^2 \cdot \text{sr} \cdot \text{yr})^{-1}$ .

Telescope Array Collaboration, R. U. Abbasi (Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba 277- (…)2026-04-24

⚛️ high-energy experiments

Precision measurement of CP violation and branching fractions in $B^{\pm} \to K^0_{\mathrm{S}} h^{\pm}$ $(h = \pi, K)$ decays and search for the rare decay $B_c^{\pm} \to K^0_{\mathrm{S}} K^{\pm}$

Using 13 TeV proton-proton collision data from the LHCb experiment, this study presents the most precise measurements to date of CP asymmetries and the branching fraction ratio for $B^{\pm} \to K^0_{\mathrm{S}} \pi^{\pm}$ and $B^{\pm} \to K^0_{\mathrm{S}} K^{\pm}$ decays, while also setting upper limits on the rare $B_c^{\pm} \to K^0_{\mathrm{S}} K^{\pm}$ decay.

R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. Adefisoye, B. Adeva, M. Adinolfi, P (…)2026-04-24

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hep-ex

Solar Reflection of Inelastic Dark Matter

b→sℓ+ℓ−(ℓ=e,μ,τ)b\to s\ell^+\ell^- (\ell = e, \mu, \tau)b→sℓ+ℓ−(ℓ=e,μ,τ) and b→sννˉb\to s\nu\bar\nub→sννˉ at Belle and Belle II

HGQ-LUT: Fast LUT-Aware Training and Efficient Architectures for DNN Inference

Searches for light exotic scalar decays at the e+^++e−^-− Higgs factory

Neutrino Masses and Phenomenology in Nnaturalness

Improving systematic uncertainties on precision two-body mass measurements

Observation of suppressed charged-particle production in ultrarelativistic oxygen-oxygen collisions

Measurement of charged-hadron distributions in heavy-flavor jets in proton-proton collisions at s\sqrt{s}s​=13 TeV

Searching for EeV photons with Telescope Array Surface Detector and neural networks

Precision measurement of CP violation and branching fractions in B±→KS0h±B^{\pm} \to K^0_{\mathrm{S}} h^{\pm}B±→KS0​h± (h=π,K)(h = \pi, K)(h=π,K) decays and search for the rare decay Bc±→KS0K±B_c^{\pm} \to K^0_{\mathrm{S}} K^{\pm}Bc±​→KS0​K±

$b\to s\ell^+\ell^- (\ell = e, \mu, \tau)$ and $b\to s\nu\bar\nu$ at Belle and Belle II

Searches for light exotic scalar decays at the e $^+$ e $^-$ Higgs factory

Measurement of charged-hadron distributions in heavy-flavor jets in proton-proton collisions at $\sqrt{s}$ =13 TeV

Precision measurement of CP violation and branching fractions in $B^{\pm} \to K^0_{\mathrm{S}} h^{\pm}$ $(h = \pi, K)$ decays and search for the rare decay $B_c^{\pm} \to K^0_{\mathrm{S}} K^{\pm}$