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.

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. Adeva, M. Adinolfi, P. Adlarson, C. Agapopoulou, C. A. Aidala, Z. Ajaltouni, S. A (…)2026-03-09⚛️ hep-ex

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 Physics Department, Geneva, Switzerland), Paula Bartulović (University of Zagreb, F (…)2026-03-09🔬 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⚛️ quant-ph

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. Bakina, Y. Ban, H. -R. Bao, V. Batozskaya, K. Begzsuren, N. Berger, M. Berlowski, M. (…)2026-03-09⚛️ hep-ex

Agentic AI -- Physicist Collaboration in Experimental Particle Physics: A Proof-of-Concept Measurement with LEP Open Data

This paper demonstrates a proof-of-concept where AI agents, directed by expert physicists, independently performed a complete precision measurement of the thrust distribution in LEP ALEPH data, marking a significant step toward integrating AI into the theory-experiment loop to accelerate discoveries in fundamental physics.

Anthony Badea, Yi Chen, Yen-Jie Lee2026-03-09⚛️ hep-ph

A Lattice QCD study of $p-\Lambda$ scattering in continuum and chiral limits

This paper presents the first systematic lattice QCD study of $I=1/2$ proton- $\Lambda$ scattering across multiple pion masses and lattice spacings, yielding scattering parameters and cross sections that agree with experimental data and confirm attractive interactions critical for nuclear theory and neutron star modeling.

Hang Liu, Liuming Liu, Jin-Xin Tan, Wei Wang, Haobo Yan, Qian-Teng Zhu2026-03-09⚛️ hep-ph

On Thrust Resummation Ambiguities in $e^+e^-$ Annihilation into Hadrons

This paper demonstrates that different, formally equivalent resummation prescriptions for the thrust distribution in $e^+e^-$ annihilation yield non-negligible numerical differences that exceed standard theoretical uncertainties, thereby necessitating more conservative error estimates in strong coupling determinations.

Luca Buonocore, Paolo Nason, Luca Rottoli, Paolo Torrielli2026-03-09⚛️ hep-ph

Next-to-next-to-leading order event generation for $t\bar{t}H$ production with approximate two-loop amplitude

This paper presents the first next-to-next-to-leading order (NNLO) QCD event generation for $t\bar{t}H$ production matched to parton showers using the MiNNLOPS method, which incorporates a novel pointwise combination of soft and high-energy two-loop amplitude approximations to provide robust, publicly available predictions for Higgs-boson decay into photons with off-shell top-quark decays.

Christian Biello, Chiara Savoini, Chiara Signorile-Signorile, Marius Wiesemann2026-03-09⚛️ hep-ph

Transformer-Based Pulse Shape Discrimination in HPGe Detectors with Masked Autoencoder Pre-training

This paper demonstrates that transformer-based models, particularly when enhanced by masked autoencoder pre-training, outperform traditional gradient-boosted decision trees in pulse-shape discrimination and energy regression for HPGe detectors by leveraging full waveform data and significantly reducing the need for labeled training samples.

Marta Babicz, Saúl Alonso-Monsalve, Alain Fauquex, Laura Baudis2026-03-09⚛️ hep-ex

Latin American HECAP Physics Briefing Book 2025

This paper presents the updated 2025 Physics Briefing Book for the Latin American Strategy Forum for Research Infrastructure in High Energy, Cosmology, and Astroparticle Physics (LASF4RI-HECAP), which synthesizes 46 community white papers and symposium discussions to establish a long-term strategic roadmap across seven key scientific and technical working groups.

Mario A. Acero (U. del Atlántico - Colombia), Alexis A. Aguilar-Arevalo (UNAM - México), Belén Andrada (CNEA/CONICET/UNSAM - Argentina), Andrés Baquero Larriva (U. del Azuay - Ecuador), Mauro Cambiaso (…)2026-03-09⚛️ hep-ph

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hep-ex

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)