⚛️ Category

hep-ex

2144 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.

⚛️ high-energy experiments

Technically Natural Suppression of Fifth Force

This paper proposes a Z2Z_2-symmetric mirror extension of the Standard Model within a bi-conformal gravity framework where spontaneous scale invariance breaking generates a light scalaron that naturally suppresses fifth-force couplings via symmetry, predicting a specific correlation between the force strength and scalar mass that aligns with next-generation experimental targets without relying on environmental screening mechanisms.

Kensuke Homma, Taishi Katsuragawa, Shinya Matsuzaki2026-04-23
⚛️ high-energy experiments

Baryon-Meson Sum Rule for b→sννˉb \to s \nu\bar\nu

This paper establishes a model-independent sum rule linking the branching fractions of Λb→Λννˉ\Lambda_b \to \Lambda \nu\bar\nu and B→K(∗)ννˉB \to K^{(\ast)} \nu\bar\nu decays, which remains exact despite numerous Wilson coefficients and shares numerical coefficients with the b→cb\to c semileptonic counterpart, thereby providing a powerful tool to discriminate new-physics scenarios involving left-handed neutrinos.

Teppei Kitahara, Manas Kumar Mohapatra, Kota Sasaki2026-04-23
⚛️ nuclear theory

Charged-Current Neutrino-Induced Single-Pion Production in the Superscaling Approach and Relativistic Distorted-Wave Impulse Approximation

This paper presents a detailed comparison of the SuSAv2 and RDWIA theoretical models against experimental measurements of charged-current neutrino-induced single-pion production from T2K, MINERvA, and MiniBooNE across a broad energy range, highlighting their respective approaches to modeling nuclear targets and pion production channels.

Jesus Gonzalez-Rosa, Alexis Nikolakopoulos, Maria B. Barbaro, Juan A. Caballero, Raúl González-Jiménez, Guillermo D. Meg (…)2026-04-23
⚛️ high-energy experiments

Using Graph Neural Networks for hadronic clustering and to reduce beam background in the Belle~II electromagnetic calorimeter

This paper proposes a novel Graph Neural Network approach to mitigate the challenges of increased beam background and irregular hadronic interactions in the Belle~II electromagnetic calorimeter by representing crystal energy depositions as sparse graphs to effectively identify and remove unwanted noise before clustering.

Jonas Eppelt, Torben Ferber2026-04-23
⚛️ nuclear experiments

Observation of impact parameter dependent modifications of nuclear parton distributions in photonuclear Pb+Pb collisions at sNN=5.02\sqrt{s_\mathrm{NN}} = 5.02 TeV with the ATLAS detector

Using 2018 ATLAS data from ultra-peripheral Pb+Pb collisions at 5.02 TeV, this study provides the first experimental observation that nuclear parton distribution modifications vary with impact parameter, evidenced by a significant difference in γ+A\gamma+A jet production cross-sections between collisions with and without forward neutron emission.

ATLAS Collaboration2026-04-23
⚛️ high-energy experiments

Observable CMB B-modes from Cosmological Phase Transitions

This paper demonstrates that tensor perturbations generated during first-order cosmological phase transitions in a secluded dark sector can produce observable CMB B-mode signals comparable to inflationary predictions, potentially complicating the interpretation of future data but offering a way to distinguish the two scenarios through multi-scale measurements.

Kylar Greene, Aurora Ireland, Gordan Krnjaic, Yuhsin Tsai2026-04-22
⚛️ high-energy experiments

Updated model-independent measurement of the strong-phase differences between D0D^0 and Dˉ0→KS/L0π+π−\bar{D}^0 \to K^{0}_{S/L}π^+π^- decays

Using quantum-correlated D0D^0-Dˉ0\bar{D}^0 decays from 7.93 fb−1^{-1} of data collected by the BESIII experiment, this paper presents the most precise model-independent measurement of strong-phase differences for D0→KS/L0π+π−D^0 \to K_{S/L}^0\pi^+\pi^- decays, which are critical inputs for reducing uncertainties in determining the CPCP-violating angle γ\gamma and charm mixing parameters.

BESIII Collaboration, M. Ablikim, M. N. Achasov, P. Adlarson, X. C. Ai, R. Aliberti, A. Amoroso, Q. An, Y. Bai, O. Bakin (…)2026-04-22
⚛️ high-energy experiments

Sampling Off-Axis Neutrino Fluxes with the Short-Baseline Near Detector

This paper demonstrates how the Short-Baseline Near Detector (SBND) can exploit its proximity to the neutrino beam target to sample off-axis flux variations via the SBND-PRISM technique, thereby expanding physics potential and enhancing robustness against cross-section uncertainties while providing publicly available flux data and covariance matrices.

P. Abratenko, R. Acciarri, C. Adams, L. Aliaga-Soplin, O. Alterkait, R. Alvarez-Garrote, D. Andrade Aldana, C. Andreopou (…)2026-04-22
⚛️ high-energy experiments

Muon Beam Dump Experiments explicate five-dimensional nature of U(1)Lμ−LτU(1)_{L_{\mu}-L_{\tau}}

This paper investigates how present and future muon beam dump experiments can probe the five-dimensional nature of U(1)Lμ−LτU(1)_{L_\mu-L_\tau} interactions by leveraging the enhanced signals from multiple Kaluza-Klein gauge bosons and their distinct decay channels to provide direct evidence for extra dimensions while constraining parameters via the muon (g−2)(g-2) anomaly.

Dibyendu Chakraborty, Arindam Chatterjee, Ayushi Kaushik, Kenji Nishiwaki2026-04-22