⚛️ Category

hep-ex

2517 papers

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.

⚛️ nuclear experiments

On the nature of fully-charmed four-quark exotic state X(6900)X(6900) from its photoproduction off nuclei

This paper investigates the photoproduction of the fully-charmed tetraquark state X(6900)X(6900) off nuclei near the kinematic threshold using a collision model, demonstrating that specific observables like excitation functions and transparency ratios are sensitive to its internal structure (compact tetraquark, molecular, or mixed) and can thus help determine its nature in future experiments at electron-ion colliders.

E. Ya. Paryev2026-08-05
⚛️ high-energy experiments

Evidence of the e+e−→f1(1285)e^+ e^-\to f_1(1285) reaction with the CMD-3 detector at VEPP-2000

Using the CMD-3 detector at the VEPP-2000 collider, researchers analyzed 109.1 pb−1^{-1} of data to report 4.5σ\sigma evidence for the production of the C-even f1(1285)f_1(1285) resonance in the e+e−→ηπ0π0e^+ e^- \to \eta\pi^0\pi^0 reaction via two-photon interaction, measuring a production cross section of 0.074±0.021±0.0100.074 \pm 0.021 \pm 0.010 nb.

R. R. Akhmetshin, A. N. Amirkhanov, A. V. Anisenkov, V. M. Aulchenko, N. S. Bashtovoy, E. V. Bedarev, D. E. Berkaev, A. (…)2026-08-05
⚛️ high-energy experiments

New measurements of Bc+B^+_c decays into single charm final states

Using 9 fb⁻¹ of proton-proton collision data from the LHCb experiment, this study reports the first observation of Bc+→D+K∗0B^+_c \to D^+ K^{*0} decays, provides evidence for Bc+→D∗0K+B^+_c \to D^{*0} K^+ and Bs+→Ds+ϕB^+_s \to D^+_s \phi decays, improves the precision of the Bc+→D0K+B^+_c \to D^0 K^+ measurement, and sets an upper limit on the Bc+→D0π+B^+_c \to D^0 \pi^+ channel, while also measuring a CPCP asymmetry compatible with zero in the D0K+D^0 K^+ mode.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. Adefisoye, B. A (…)2026-08-05
⚛️ phenomenology

Probing Heavy-Quark Spin Symmetry in Double J/ψJ/\psi Hadroproduction

This paper presents the first complete O(αs5)\mathcal{O}(\alpha_s^5) analysis of prompt double J/ψJ/\psi hadroproduction within the nonrelativistic-QCD framework, deriving a new set of long-distance matrix elements that successfully describe LHC data on J/ψJ/\psi pairs, single J/ψJ/\psi yields and polarization, and ηc\eta_c production, thereby providing a robust test of heavy-quark spin symmetry.

Zhi-Guo He, Xiao-Bo Jin, Bernd A. Kniehl2026-08-05
⚛️ high-energy experiments

Timing-Based Search for Magnetic Monopoles with the NOvA Detector on the Surface

The NOvA experiment conducted a timing-based search for cosmic-ray magnetic monopoles using 2,743 live days of data from its surface Far Detector, finding no evidence of such particles and setting a new upper flux limit for low-mass monopoles (>109>10^9 GeV) in the speed range 6×10−4<β<5×10−36\times 10^{-4} < \beta < 5\times 10^{-3}.

NOvA Collaboration2026-08-05
⚛️ high-energy experiments

Systematic study of light and charm meson M1 radiative transitions

Motivated by recent experimental advancements, this paper systematically investigates light and charm meson M1 radiative transitions by calculating effective transition magnetic moments and decay widths using an effective mass scheme and a non-relativistic potential model, while highlighting the decisive role of higher-order QCD corrections and scale-dependent effects.

Binesh Mohan, Christas Mony A., Rohit Dhir2026-08-04
⚛️ high-energy experiments

Amortized Inference of Multi-Modal Posteriors using Likelihood-Weighted Normalizing Flows

This paper introduces an amortized inference method using likelihood-weighted normalizing flows that overcomes the limitations of standard unimodal base distributions by initializing with a Gaussian Mixture Model, thereby accurately capturing multi-modal, non-Gaussian posteriors in high-dimensional inverse problems as demonstrated in multi-modal benchmarks and a heavy flavor physics application.

Rajneil Baruah2026-08-04
⚛️ high-energy experiments

Search for heavy resonances decaying into two Higgs bosons in the bbˉτ+τ−\mathrm{b\bar{b}}τ^+τ^- final state in proton-proton collisions at s\sqrt{s} = 13 TeV

Using 138 fb−1^{-1} of proton-proton collision data at s\sqrt{s} = 13 TeV collected by the CMS detector, this study searches for heavy resonances decaying into two Higgs bosons in the bbˉτ+τ−\mathrm{b\bar{b}}\tau^+\tau^- final state, finding no evidence for new physics and setting the most sensitive limits to date on such production cross sections for masses between 1.4 and 4.5 TeV.

CMS Collaboration2026-08-04
⚛️ phenomenology

The flavour of SU(15) composite quarks and leptons

This paper proposes an SU(15)pSU(15)_p composite model where Standard Model particles emerge as bound states, demonstrating that a specific flavor structure with two spurions can simultaneously reproduce all quark and lepton masses and the CKM matrix while predicting that electron electric dipole moments and neutral kaon mixing provide the most stringent constraints on the compositeness scale, potentially reaching up to 10610^6 TeV.

Benoît Assi, Ryan Plestid, Amartya Sengupta, Jure Zupan2026-08-04
⚛️ nuclear experiments

Modification of Υ\Upsilon production in ppO and OO collisions at LHCb

The LHCb collaboration measured Υ\Upsilon meson production in ppO and OO collisions, finding that while ppO collisions show only slight suppression, OO collisions exhibit significant suppression of excited states consistent with quark-gluon plasma formation and color screening effects.

LHCb collaboration, R. Aaij, M. Abdelfatah, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. (…)2026-08-04