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

Searching for UFOs from the early universe: direct detection prospects for relativistically decoupling dark matter

This paper demonstrates that ultrarelativistically frozen-out (UFO) dark matter candidates, particularly those mediated by a $Z'$ portal, represent a viable and detectable alternative to traditional WIMPs, with current experiments like LZ and XENONnT already constraining their parameter space and future detectors such as SuperCDMS SNOLAB poised to explore significant regions in the 0.5–10 GeV mass range.

Stephen E. Henrich, Yann Mambrini, Keith A. Olive2026-05-06✓ Author reviewed ⓘ

⚛️ phenomenology

Closing the knowledge gap in semileptonic $B\rightarrow X_c\ell\nu$ decays

This paper summarizes the current status of exclusive semileptonic $B\rightarrow X_c\ell\nu$ branching fractions, identifies unmeasured components dominated by baryonic and $D_s$ final states, and proposes specific candidates and simplified models to close the gap with inclusive measurements.

Florian Herren, Raynette van Tonder2026-05-06

⚛️ high-energy experiments

Improved muon energy estimation using a detailed model of multiple Coulomb scattering in the MicroBooNE LArTPC

This paper presents an improved technique for estimating muon energy in the MicroBooNE LArTPC by modeling multiple Coulomb scattering with enhanced detector non-idealizations, achieving significantly better resolution and reduced bias compared to previous methods while demonstrating strong agreement between data and simulations.

P. Abratenko, D. Andrade Aldana, J. Asaadi, A. Ashkenazi, S. Balasubramanian, B. Baller, A. Barnard, G. Barr, D. Barrow (…)2026-05-06

⚛️ phenomenology

Toward a Community Roadmap for High Energy Physics and Artificial Intelligence in China and Beyond

This paper presents a community-informed overview and initial roadmap for the development of Artificial Intelligence in High Energy Physics, drawing on discussions from the 2025 Qingdao workshop to guide future coordinated efforts in China and globally.

Tianji Cai, Ke Li, Teng Li2026-05-06

⚛️ high-energy experiments

Measurement of $\gamma$ using $B^{\pm}\rightarrow DK^{\pm}$ and $B^{\pm}\rightarrow D\pi^{\pm}$ decays with $D\rightarrow K_{\rm S}^{0}\pi^{+}\pi^{-}$ and $D\rightarrow K_{\rm S}^{0}K^{+}K^{-}$

Using the upgraded LHCb detector with 5.8 fb $^{-1}$ of 2024 data, this paper presents the first measurement of the CKM angle $\gamma$ via $B^{\pm}\rightarrow DK^{\pm}$ and $B^{\pm}\rightarrow D\pi^{\pm}$ decays with $D$ mesons decaying to $K_{\rm S}^{0}\pi^{+}\pi^{-}$ or $K_{\rm S}^{0}K^{+}K^{-}$ , yielding a value of $\gamma=(68.1\pm 6.7)^{\circ}$ through the observation of $C\!P$ violation in Dalitz plot distributions.

LHCb collaboration, R. Aaij, M. Abdelfatah, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. (…)2026-05-06

⚛️ high-energy experiments

Searching for long-lived particles with the ILD experiment

This paper presents a full simulation study of the International Large Detector's (ILD) capabilities for searching for long-lived particles at future $e^+e^-$ colliders, demonstrating its potential to detect displaced vertices and kinked tracks across various challenging final states and establish exclusion limits for both model-independent scenarios and Higgs boson decays.

Jan Klamka, Aleksander Filip Żarnecki2026-05-06

⚛️ lattice

Predictions for the scalar partner of the LHC tetraquark $X(6600)$

This paper predicts the existence of a lighter scalar partner, $X(6400)$ , for the recently observed $X(6600)$ tetraquark based on CMS data, urging further experimental investigation to confirm an S-wave multiplet of $cc\bar{c}\bar{c}$ states and distinguish between competing theoretical models.

Muhammad Naeem Anwar, Timothy J. Burns2026-05-06

⚛️ nuclear experiments

A Precise Determination of $\alpha_s$ from the Heavy Jet Mass Distribution

This paper presents a precise determination of the strong coupling constant $\alpha_s(m_Z) = 0.1148^{+ 0.0015}_{-0.0022}$ through a global fit of $e^+e^-$ heavy jet mass data, utilizing state-of-the-art theoretical predictions that combine fixed-order calculations, multiple resummation orders, and first-principles power corrections to demonstrate the critical role of resummation in achieving robust results and revealing evidence for negative power corrections in the trijet region.

Miguel A. Benitez, Arindam Bhattacharya, Andre H. Hoang, Vicent Mateu, Matthew D. Schwartz, Iain W. Stewart, Xiaoyuan Zh (…)2026-05-05

⚛️ high-energy experiments

An electron-hadron collider at the high-luminosity LHC

This paper proposes a "phase-one" electron-hadron collider concept utilizing a 20 GeV Energy Recovery Linac to deliver concurrent collisions with the high-luminosity LHC during Run 5, detailing the necessary beam dynamics, accelerator technologies, and detector constraints to unlock unique scientific potential.

Kevin David J André, Laurent Forthomme, Bernhard Holzer, Krzysztof Piotrzkowski2026-05-05

⚛️ high-energy experiments

Sphalerogenesis

The paper proposes a mechanism called "sphalerogenesis" to explain the baryon asymmetry of the universe through the CP-violating decay of electroweak sphalerons mediated by a dimension-six operator, suggesting a new physics scale of approximately 38 TeV that could be tested via future electron electric dipole moment measurements.

Masanori Tanaka2026-05-05

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hep-ex

Searching for UFOs from the early universe: direct detection prospects for relativistically decoupling dark matter

Closing the knowledge gap in semileptonic B→XcℓνB\rightarrow X_c\ell\nuB→Xc​ℓν decays

Improved muon energy estimation using a detailed model of multiple Coulomb scattering in the MicroBooNE LArTPC

Toward a Community Roadmap for High Energy Physics and Artificial Intelligence in China and Beyond

Measurement of γ\gammaγ using B±→DK±B^{\pm}\rightarrow DK^{\pm}B±→DK± and B±→Dπ±B^{\pm}\rightarrow D\pi^{\pm}B±→Dπ± decays with D→KS0π+π−D\rightarrow K_{\rm S}^{0}\pi^{+}\pi^{-}D→KS0​π+π− and D→KS0K+K−D\rightarrow K_{\rm S}^{0}K^{+}K^{-}D→KS0​K+K−

Searching for long-lived particles with the ILD experiment

Predictions for the scalar partner of the LHC tetraquark X(6600)X(6600)X(6600)

A Precise Determination of αs\alpha_sαs​ from the Heavy Jet Mass Distribution

An electron-hadron collider at the high-luminosity LHC

Sphalerogenesis

Closing the knowledge gap in semileptonic $B\rightarrow X_c\ell\nu$ decays

Measurement of $\gamma$ using $B^{\pm}\rightarrow DK^{\pm}$ and $B^{\pm}\rightarrow D\pi^{\pm}$ decays with $D\rightarrow K_{\rm S}^{0}\pi^{+}\pi^{-}$ and $D\rightarrow K_{\rm S}^{0}K^{+}K^{-}$

Predictions for the scalar partner of the LHC tetraquark $X(6600)$

A Precise Determination of $\alpha_s$ from the Heavy Jet Mass Distribution