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.

⚛️ high-energy experiments

Testing lepton non-unitarity with the next generation of Germanium-based CE $\nu$ NS reactor experiments

This paper investigates how deviations from unitarity in the leptonic mixing matrix, arising from either heavy or light sterile neutrinos, modify coherent elastic neutrino-nucleus scattering and elastic neutrino-electron scattering, presenting sensitivity projections for a future upscaling of the CONUS+ experiment that demonstrate its potential to probe TeV-scale new physics.

Salvador Centelles Chuliá, Manfred Lindner, Thomas Rink2026-05-27

⚛️ high-energy experiments

$B$ -meson decay width up to $1/m_b^3$ corrections within and beyond the Standard Model

This paper presents a complete calculation of $B$ -meson decay widths up to $1/m_b^3$ corrections within and beyond the Standard Model by deriving analytic expressions for all matching coefficients of two-quark operators and previously missing weak-annihilation contributions, thereby finalizing the theoretical framework for non-leptonic $b$ -quark decays relevant to $B$ -meson lifetimes and addressing tensions in QCD factorization.

Martin Lang, Alexander Lenz, Ali Mohamed, Maria Laura Piscopo, Aleksey V. Rusov2026-05-27

⚛️ high-energy experiments

Search for lepton-number-violating $B^-\to D^{(*)+}\mu^-\mu^-$ decays

Using 13 TeV proton-proton collision data corresponding to 5.4 fb $^{-1}$ of integrated luminosity, the LHCb experiment conducted a search for lepton-number-violating $B^-\to D^{(*)+}\mu^-\mu^-$ decays, observed no significant signal, and established 95% confidence level upper limits on the branching fractions of $4.6 \times 10^{-8}$ and $5.9 \times 10^{-8}$ for the $D^+$ and $D^{*+}$ modes, respectively.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. Adefisoye, B. A (…)2026-05-27

🤖 machine learning

PhyGHT: Physics-Guided HyperGraph Transformer for Signal Purification at the HL-LHC

The paper introduces PhyGHT, a physics-guided hypergraph transformer equipped with a Pileup Suppression Gate to effectively filter extreme pileup noise and accurately reconstruct top-quark signals at the High-Luminosity Large Hadron Collider, outperforming existing state-of-the-art methods.

Mohammed Rakib, Luke Vaughan, Shivang Patel, Flera Rizatdinova, Alexander Khanov, Atriya Sen2026-05-27

⚛️ high-energy experiments

Search for a new heavy scalar resonance decaying to a pair of Z bosons in the four-lepton final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration analyzed 138 fb $^{-1}$ of proton-proton collision data at 13 TeV to search for a heavy scalar resonance decaying to two Z bosons in the four-lepton final state, finding no significant excess over the Standard Model background and setting 95% confidence level upper limits on the production cross section across a mass range of 130 GeV to 3 TeV.

CMS Collaboration2026-05-27

⚛️ high-energy experiments

Sensitivity of Heavy-Quark Dipolar Flow to its Initial Spatial Distributions in Cu+Au Collisions

This study demonstrates that the directed flow ( $v_1$ ) of charm quarks in asymmetric Cu+Au collisions is significantly enhanced compared to light hadrons and serves as a sensitive probe for both the initial spatial distribution of heavy quarks and temperature-dependent medium transport coefficients.

Ankit Kumar Panda, Tribhuban Parida2026-05-27

⚛️ high-energy experiments

Family-separated seesaw relations of Majorana neutrinos

The paper proposes a novel "family-separated" solution to the canonical seesaw mechanism that establishes a direct correlation between the masses and mixing parameters of light and heavy Majorana neutrinos, thereby linking CP-violating effects in neutrino oscillations to heavy neutrino decays.

Zhi-zhong Xing2026-05-27

⚛️ nuclear experiments

Study of nuclear effects on charm production in light-ion collisions

This LHCb study of $D^0$ meson production in NeNe and OO collisions at 5.36 TeV reveals a transverse momentum-dependent variation inconsistent with nuclear structure modifications alone, providing evidence for the onset of quark-gluon plasma formation in light-ion collisions.

LHCb collaboration, R. Aaij, M. Abdelfatah, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. (…)2026-05-27

⚛️ high-energy experiments

Exploring the lifetime frontier with a beam-dump experiment at CiADS

This paper proposes a cost-effective beam-dump experiment at the CiADS facility to search for long-lived particles, specifically demonstrating that a 5-year run could probe currently unexcluded parameter spaces for dark photons with masses around 100 MeV and kinetic mixing between $10^{-9}$ and $10^{-8}$ , while also noting similar potential at the nearby HIAF.

Liangwen Chen, Mingxuan Du, Zhiyu Sun, Zeren Simon Wang, Fang Xie, Ju-Jun Xie, Lei Yang, Pei Yu, Yu Zhang2026-05-26

⚛️ high-energy experiments

Novel method for determining the light quark mass ratio using $\eta'\to\eta \pi\pi$ decays

This paper proposes and demonstrates a novel method for extracting the light quark mass ratio parameter $Q$ from $\eta'\to\eta \pi\pi$ decays by mapping Dalitz plots to a unit disk to isolate symmetry breaking effects, yielding a preliminary result of $Q=22.5\pm1.0$ consistent with previous determinations.

Adolfo Guevara, Feng-Kun Guo, Hao-Jie Jing2026-05-26

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hep-ex

Testing lepton non-unitarity with the next generation of Germanium-based CEν\nuνNS reactor experiments

BBB-meson decay width up to 1/mb31/m_b^31/mb3​ corrections within and beyond the Standard Model

Search for lepton-number-violating B−→D(∗)+μ−μ−B^-\to D^{(*)+}\mu^-\mu^-B−→D(∗)+μ−μ− decays

PhyGHT: Physics-Guided HyperGraph Transformer for Signal Purification at the HL-LHC

Search for a new heavy scalar resonance decaying to a pair of Z bosons in the four-lepton final state in proton-proton collisions at s\sqrt{s}s​ = 13 TeV

Sensitivity of Heavy-Quark Dipolar Flow to its Initial Spatial Distributions in Cu+Au Collisions

Family-separated seesaw relations of Majorana neutrinos

Study of nuclear effects on charm production in light-ion collisions

Exploring the lifetime frontier with a beam-dump experiment at CiADS

Novel method for determining the light quark mass ratio using η′→ηππ\eta'\to\eta \pi\piη′→ηππ decays

Testing lepton non-unitarity with the next generation of Germanium-based CE $\nu$ NS reactor experiments

$B$ -meson decay width up to $1/m_b^3$ corrections within and beyond the Standard Model

Search for lepton-number-violating $B^-\to D^{(*)+}\mu^-\mu^-$ decays

Search for a new heavy scalar resonance decaying to a pair of Z bosons in the four-lepton final state in proton-proton collisions at $\sqrt{s}$ = 13 TeV

Novel method for determining the light quark mass ratio using $\eta'\to\eta \pi\pi$ decays