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.

⚛️ phenomenology

Radiative corrections to the nucleon isovector $g_V$ and $g_A$

This paper calculates enhanced electroweak, QCD, and QED radiative corrections to the nucleon coupling constants $g_V$ and $g_A$ , providing updated relations between lattice-QCD and physical values that yield a total correction of approximately 3.5% to 5.6% and predict a physical axial charge $g_A$ of 1.265(26) or 1.240(9) depending on the input methodology.

Oleksandr Tomalak, Yi-Bo Yang2026-03-10

⚛️ high-energy experiments

Improved branching-fraction measurements of $B^0_{(s)} \to K_S^0 h^+ h^{'-}$ decays and first observation of $B^0_(s) \to K_S^0 K^+ K^-$

Using 9 fb $^{-1}$ of LHCb $pp$ collision data, this study reports the first observation of the $B^0_s \to K^0_S K^+ K^-$ decay and provides improved measurements of branching-fraction ratios for various charmless three-body $B^0_{(s)} \to K^0_S h^+ h^{\prime -}$ decays.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. Adefisoye, B. A (…)2026-03-10

⚛️ quantum physics

Characterization and upgrade of a quantum graph neural network for charged particle tracking

This paper characterizes and upgrades a hybrid quantum-classical graph neural network for charged particle track reconstruction in high-luminosity LHC environments, demonstrating improved training convergence and behavior through the integration of parametrized quantum circuits.

Matteo Argenton, Laura Cappelli, Concezio Bozzi2026-03-10

🔬 atomic physics

Multimessenger Astronomy Beyond the Standard Model: New Window from Quantum Sensors

This paper proposes that quantum sensors can detect bursts of ultralight bosonic fields emitted during violent astrophysical events, thereby establishing a new multimessenger astronomy channel that remains viable even when accounting for matter screening effects.

Jason Arakawa, Muhammad H. Zaheer, Volodymyr Takhistov, Marianna S. Safronova, Joshua Eby, Charles Cheung2026-03-09

⚛️ high-energy experiments

Scalable Multi-Task Learning for Particle Collision Event Reconstruction with Heterogeneous Graph Neural Networks

This paper proposes a scalable Heterogeneous Graph Neural Network (HGNN) that employs a multi-task learning paradigm to simultaneously perform particle vertex association and graph pruning, thereby significantly improving beauty hadron reconstruction performance and inference efficiency for complex particle collision events at the Large Hadron Collider.

William Sutcliffe, Marta Calvi, Simone Capelli, Jonas Eschle, Julián García Pardiñas, Abhijit Mathad, Azusa Uzuki, Nicol (…)2026-03-09

⚛️ phenomenology

System size and event shape dependence of particle-identified balance functions in proton-proton collisions at $\sqrt{s} = 13$ TeV using PYTHIA 8 and EPOS models

This study utilizes PYTHIA 8 and EPOS-LHC models to demonstrate that particle-identified balance functions in 13 TeV proton-proton collisions exhibit distinct dependencies on event multiplicity and spherocity, revealing that while PYTHIA 8 reflects fragmentation-dominated dynamics, EPOS-LHC captures collective effects like radial flow and diffusion that mimic heavy-ion behavior, thereby offering a powerful tool to disentangle hadronization mechanisms and medium-like collectivity in small collision systems.

Subash Chandra Behera, Arvind Khuntia2026-03-09

⚛️ high-energy experiments

A model-independent measurement of the CKM angle $\gamma$ in the decays $B^\pm\to[K^+K^-\pi^+\pi^-]_D h^\pm$ and $B^\pm\to[\pi^+\pi^-\pi^+\pi^-]_D h^\pm$ ( $h = K, \pi$ )

Using 9 fb $^{-1}$ of LHCb proton-proton collision data, this paper presents the first phase-space-binned, model-independent measurement of the CKM angle $\gamma$ in $B^\pm\to[K^+K^-\pi^+\pi^-]_D h^\pm$ and $B^\pm\to[\pi^+\pi^-\pi^+\pi^-]_D h^\pm$ decays, yielding a result of $53.9^\circ$ that, when combined with existing integrated measurements, achieves one of the most precise determinations of $\gamma$ to date at $52.6^\circ$ .

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. Adefisoye, B. A (…)2026-03-09

🔬 physics

First results of a Monolithic Active Pixel Sensor with Internal Signal Gain Fully Integrated in a 180 nm CMOS Technology

This paper presents the first results of the CASSIA sensor, a novel monolithic active pixel sensor fabricated in 180 nm CMOS technology that utilizes fully integrated internal gain layers to achieve signal amplification, enabling operation in both low-gain proportional and high-gain single-photon avalanche modes for improved timing resolution and pile-up mitigation in high-luminosity particle physics experiments.

Heinz Pernegger (CERN, Experimental Physics Department, Geneva, Switzerland), Emma Kate Anderson (CERN, Experimental Phy (…)2026-03-09

⚛️ quantum physics

Optimization-based Unfolding in High-Energy Physics

This paper introduces QUnfold, an open-source framework that reformulates the High-Energy Physics unfolding problem as a Quadratic Unconstrained Binary Optimization (QUBO) task, enabling competitive reconstruction accuracy through both classical solvers and quantum-compatible methods like D-Wave's hybrid solver.

Simone Gasperini, Gianluca Bianco, Marco Lorusso, Carla Rieger, Michele Grossi2026-03-09

⚛️ high-energy experiments

Multi-channel joint analysis of the exotic charmonium-like state $T_{c\bar{c}}(4020)$

Using a multi-channel joint analysis of BESIII data from $e^{+}e^{-}$ collisions, this study identifies the exotic charmonium-like state $T_{c\bar{c}}(4020)$ as a $J^{P}=1^{+}$ resonance with $11.7\sigma$ significance, while extracting its pole positions and relative branching fractions across three decay channels.

BESIII Collaboration, M. Ablikim, M. N. Achasov, P. Adlarson, X. C. Ai, R. Aliberti, A. Amoroso, Q. An, Y. Bai, O. Bakin (…)2026-03-09

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hep-ex

Radiative corrections to the nucleon isovector gVg_VgV​ and gAg_AgA​

Improved branching-fraction measurements of B(s)0→KS0h+h′−B^0_{(s)} \to K_S^0 h^+ h^{'-}B(s)0​→KS0​h+h′− decays and first observation of B(0s)→KS0K+K−B^0_(s) \to K_S^0 K^+ K^-B(0​s)→KS0​K+K−

Characterization and upgrade of a quantum graph neural network for charged particle tracking

Multimessenger Astronomy Beyond the Standard Model: New Window from Quantum Sensors

Scalable Multi-Task Learning for Particle Collision Event Reconstruction with Heterogeneous Graph Neural Networks

System size and event shape dependence of particle-identified balance functions in proton-proton collisions at s=13\sqrt{s} = 13s​=13 TeV using PYTHIA 8 and EPOS models

A model-independent measurement of the CKM angle γ\gammaγ in the decays B±→[K+K−π+π−]Dh±B^\pm\to[K^+K^-\pi^+\pi^-]_D h^\pmB±→[K+K−π+π−]D​h± and B±→[π+π−π+π−]Dh±B^\pm\to[\pi^+\pi^-\pi^+\pi^-]_D h^\pmB±→[π+π−π+π−]D​h± (h=K,πh = K, \pih=K,π)

First results of a Monolithic Active Pixel Sensor with Internal Signal Gain Fully Integrated in a 180 nm CMOS Technology

Optimization-based Unfolding in High-Energy Physics

Multi-channel joint analysis of the exotic charmonium-like state Tccˉ(4020)T_{c\bar{c}}(4020)Tccˉ​(4020)

Radiative corrections to the nucleon isovector $g_V$ and $g_A$

Improved branching-fraction measurements of $B^0_{(s)} \to K_S^0 h^+ h^{'-}$ decays and first observation of $B^0_(s) \to K_S^0 K^+ K^-$

System size and event shape dependence of particle-identified balance functions in proton-proton collisions at $\sqrt{s} = 13$ TeV using PYTHIA 8 and EPOS models

A model-independent measurement of the CKM angle $\gamma$ in the decays $B^\pm\to[K^+K^-\pi^+\pi^-]_D h^\pm$ and $B^\pm\to[\pi^+\pi^-\pi^+\pi^-]_D h^\pm$ ( $h = K, \pi$ )

Multi-channel joint analysis of the exotic charmonium-like state $T_{c\bar{c}}(4020)$