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.

⚛️ lattice

Chiral symmetry breaking for large "Nf" and the properties of the "rho" meson near the conformal window

This paper investigates how the ground-state properties of the $\rho$ meson evolve as the number of light-quark flavors ( $N_f$ ) approaches the conformal window, revealing that while chiral symmetry restoration and deconfinement occur at a critical flavor number, the $\rho$ meson's survival is governed by the divergence of the confinement length scale rather than mass crossing, resulting in a larger, rounder object with flattened form factors and an expanding charge radius.

Aftab Ahmad, Samreen Fatima, Muhammad Shahbaz, Marco Antonio Bedolla, Alfredo Raya, Muhammad Imran2026-09-15

⚛️ phenomenology

Boosted or Inelastic? Discriminating Interpretations of the LZ 248 keV Event

This paper proposes that the single 248 keV nuclear recoil event observed by the LUX-ZEPLIN experiment can be explained by either endothermic inelastic dark matter or boosted dark matter, demonstrating that these two scenarios are spectrally distinguishable across different effective operators and can be definitively resolved with additional data from the full LZ exposure.

Satyabrata Mahapatra, Partha Kumar Paul2026-09-15

⚛️ high-energy experiments

Inelastic Dark Matter at LZ from Radiative Dirac Neutrino Mass Paradigm

This paper proposes a radiative Dirac neutrino mass model with a specific scalar and fermion sector that naturally generates the off-diagonal nucleon coupling required to explain the high-energy LZ230616 event via inelastic dark matter scattering, while simultaneously accounting for neutrino masses, the observed relic abundance, and existing experimental constraints.

Pankaj Borah, Satyabrata Mahapatra, Newton Nath, Partha Kumar Paul2026-09-15

⚛️ high-energy experiments

Search for charmonium(like) states $X$ in $e^{+}e^{-}\rightarrow\gamma X\rightarrow\gamma D^{0}\bar{D}^{0}$ at BESIII

Using a data sample of 1667.4 pb $^{-1}$ collected at $\sqrt{s} = 4.682$ GeV with the BESIII detector, a search for charmonium-like states $X$ decaying into $D^{*0}\bar{D}^{*0}$ via the process $e^{+}e^{-}\rightarrow\gamma X$ yielded no significant signal, resulting in the establishment of 90% confidence level upper limits on the product of the production cross section and branching fraction for potential $C$ -even states including $X(4013)$ and various excited charmonia.

BESIII Collaboration, M. Ablikim, M. N. Achasov, P. Adlarson, X. C. Ai, C. S. Akondi, R. Aliberti, A. Amoroso, Q. An, Y. (…)2026-09-15

⚛️ high-energy experiments

Improved amplitude analysis of $\eta^\prime\to\pi^+\pi^-\pi^0$ and $\eta^\prime\to\pi^0\pi^0\pi^0$

Using a large sample of $J/\psi$ events from the BESIII detector, this study performs an amplitude analysis of $\eta'\to\pi^+\pi^-\pi^0$ and $\eta'\to\pi^0\pi^0\pi^0$ decays, observing significant $\pi\pi$ $P$ - and $S$ -wave interactions while highlighting that the resulting branching fractions are strongly model-dependent due to large interference effects.

M. Ablikim, M. N. Achasov, P. Adlarson, X. C. Ai, C. S. Akondi, R. Aliberti, A. Amoroso, Q. An, M. S. Anderson, Y. Bai (…)2026-09-15

⚛️ lattice

Determination of charged pion unpolarised TMDPDFs from Drell-Yan measurements

This paper presents an extraction of unpolarised transverse momentum dependent parton distribution functions for valence quarks in the pion by applying TMD factorisation to Drell-Yan experimental data, utilizing recent perturbative results and a precise nucleon TMDPDF to derive findings consistent with previous phenomenological and lattice computations.

Wen-Chen Chang, Chia-Yu Hsieh, Chung-Wen Kao, C. -J. David Lin, Valentin Moos, Wayne Morris2026-09-15

⚛️ high-energy experiments

Observation of $\Xi_{b}^{0} \to \Xi^{0} J/\psi$ and evidence for $\Xi_{b}^{0} \to \Xi^{0} \psi(2S)$ decays

Using LHCb data from 2016–2018, this paper reports the first observation of the $\Xi_{b}^{0} \to \Xi^{0} J/\psi$ decay and evidence for $\Xi_{b}^{0} \to \Xi^{0} \psi(2S)$ , marking the first full reconstruction of the $\Xi^{0}$ hyperon at an LHC experiment and providing a measurement of their branching fraction ratio.

LHCb collaboration, R. Aaij, M. Abdelfatah, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. (…)2026-09-15

⚛️ high-energy experiments

Calibration of electromagnetic shower features in the CMS calorimeter with machine-learning techniques

This paper introduces and compares two novel machine-learning-based calibration methods—a reweighting approach and a normalizing-flow approach—to correct discrepancies between simulated and experimental electromagnetic shower features in the CMS calorimeter using 2022 proton-proton collision data at 13.6 TeV.

CMS Collaboration2026-09-15

⚛️ high-energy experiments

A DM candidate indicated at Fermi-LAT and LZ ? Connection with LHC and LC prospects

This paper proposes that a 20 GeV Fermi-LAT photon excess and a LUX-ZEPLIN dark matter candidate can be explained by dark matter annihilating via spin-2 Kaluza-Klein graviton resonances, a scenario distinct from SUSY interpretations that could be confirmed by LHC data and probed by future electron-positron colliders.

Alain Le-Yaouanc, François Richard2026-09-15

⚛️ high-energy experiments

Effect of inelastic scalar dark matter in hidden $U(1)$ scenario after the LZ nuclear recoil

This paper investigates a hidden $U(1)_H$ extension of the Standard Model featuring inelastic scalar dark matter to explain a recent high-energy nuclear recoil event observed by the LZ collaboration, while deriving constraints on the kinetic mixing parameter and comparing them with existing experimental bounds.

Arindam Das, Takaaki Nomura2026-09-15

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hep-ex

Chiral symmetry breaking for large "Nf" and the properties of the "rho" meson near the conformal window

Boosted or Inelastic? Discriminating Interpretations of the LZ 248 keV Event

Inelastic Dark Matter at LZ from Radiative Dirac Neutrino Mass Paradigm

Search for charmonium(like) states XXX in e+e−→γX→γD∗0Dˉ∗0e^{+}e^{-}\rightarrow\gamma X\rightarrow\gamma D^{*0}\bar{D}^{*0}e+e−→γX→γD∗0Dˉ∗0 at BESIII

Improved amplitude analysis of η′→π+π−π0\eta^\prime\to\pi^+\pi^-\pi^0η′→π+π−π0 and η′→π0π0π0\eta^\prime\to\pi^0\pi^0\pi^0η′→π0π0π0

Determination of charged pion unpolarised TMDPDFs from Drell-Yan measurements

Observation of Ξb0→Ξ0J/ψ\Xi_{b}^{0} \to \Xi^{0} J/\psiΞb0​→Ξ0J/ψ and evidence for Ξb0→Ξ0ψ(2S)\Xi_{b}^{0} \to \Xi^{0} \psi(2S)Ξb0​→Ξ0ψ(2S) decays

Calibration of electromagnetic shower features in the CMS calorimeter with machine-learning techniques

A DM candidate indicated at Fermi-LAT and LZ ? Connection with LHC and LC prospects

Effect of inelastic scalar dark matter in hidden U(1)U(1)U(1) scenario after the LZ nuclear recoil

Search for charmonium(like) states $X$ in $e^{+}e^{-}\rightarrow\gamma X\rightarrow\gamma D^{0}\bar{D}^{0}$ at BESIII

Improved amplitude analysis of $\eta^\prime\to\pi^+\pi^-\pi^0$ and $\eta^\prime\to\pi^0\pi^0\pi^0$

Observation of $\Xi_{b}^{0} \to \Xi^{0} J/\psi$ and evidence for $\Xi_{b}^{0} \to \Xi^{0} \psi(2S)$ decays

Effect of inelastic scalar dark matter in hidden $U(1)$ scenario after the LZ nuclear recoil