⚛️ Category

hep-ex

2160 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.

⚛️ high-energy experiments

Resonant Parameters of Vector Charmonium-like States above 4.4 GeV

This paper presents a simultaneous fit to BESIII cross-section data for various charmonium-like final states above 4.4 GeV, determining the resonant parameters of four structures (ψ(4230)\psi(4230), ψ(4500)\psi(4500), ψ(4660)\psi(4660), and ψ(4710)\psi(4710)) and finding that the ψ(4660)\psi(4660) and ψ(4710)\psi(4710) dominantly drive the production of Ds+Ds1∗−(2536)D_s^{+}D_{s1}^{*-}(2536), Ds+Ds2∗−(2573)D_s^{+}D_{s2}^{*-}(2573), and ϕχc1,2\phi\chi_{c1,2} channels.

Chunhua Li, Wanting Liu, Linfa Tang, Ying Ding2026-03-25
⚛️ high-energy experiments

Search for new particles decaying into top quark-antiquark pairs in proton-proton collisions at s\sqrt{s} = 13 TeV

Using 138 fb−1^{-1} of proton-proton collision data at 13 TeV collected by the CMS detector, this study performs a comprehensive search for new particles decaying into top quark-antiquark pairs across all lepton final states, setting the most stringent limits to date on heavy Z' bosons, Kaluza-Klein gluons, dark-matter mediators, and two-Higgs-doublet model scalars.

CMS Collaboration2026-03-25
⚛️ high-energy experiments

Entanglement-enhanced AC magnetometry in the presence of Markovian noises

This paper demonstrates that, contrary to the limitations observed in DC magnetometry, entangled GHZ states can enhance the sensitivity of AC magnetometry under parallel Markovian decoherence by scaling the interaction time as 1/L1/L to mitigate noise effects and improve the detectable frequency bandwidth.

Thanaporn Sichanugrist, Hajime Fukuda, Takeo Moroi, Kazunori Nakayama, So Chigusa, Norikazu Mizuochi, Masashi Hazumi, Yu (…)2026-03-24
⚛️ high-energy experiments

Charmed Λc+\Lambda_c^+ baryon decays into light scalar mesons in the topological SU(3)fSU(3)_f framework

Using the topological-diagram approach within the SU(3)fSU(3)_f framework, this paper investigates two-body Λc+\Lambda_c^+ decays into light scalar mesons and demonstrates that interpreting these mesons as tetraquark states provides a consistent explanation for experimental data, including the unexpectedly large branching fraction of Λc+→Λa0+\Lambda_c^+ \to \Lambda a_0^+, while predicting new decay rates that are accessible to current and future experiments.

Y. L. Wang, Y. K. Hsiao2026-03-24
⚛️ high-energy experiments

Model-independent measurement of the Higgs boson associated production with two jets and decaying to a pair of W bosons in proton-proton collisions at s\sqrt{s} = 13 TeV

Using 138 fb⁻¹ of 13 TeV proton-proton collision data collected by the CMS detector, this paper presents a model-independent measurement of the differential production cross section for Higgs bosons decaying to W boson pairs in association with two jets, utilizing a machine learning-derived variable to constrain Higgs couplings within the Standard Model effective field theory framework.

CMS Collaboration2026-03-24
⚛️ high-energy experiments

Measurement of the branching fraction of the Λb0→J/ψΛ\Lambda_b^0\to J/\psi\Lambda decay and isospin asymmetry of B→J/ψKB\to J/\psi K decays

Using LHCb proton-proton collision data from 2016 to 2018, this paper reports a precise measurement of the Λb0→J/ψΛ\Lambda_b^0\to J/\psi\Lambda branching fraction relative to B0→J/ψKS0B^0\to J/\psi K^0_\text{S} and determines the isospin asymmetry between B0→J/ψKS0B^0\to J/\psi K^0_\text{S} and B+→J/ψK+B^+\to J/\psi K^+ decays.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. Adefisoye, B. A (…)2026-03-24
⚛️ high-energy experiments

Background Suppression in Quantum Sensing of Dark Matter via Collective Entangled-State Projection

This paper proposes a protocol for enhancing dark matter detection sensitivity by projecting quantum sensors into a collective excited state, which suppresses non-collective noise by a factor equal to the number of sensors without requiring the maintenance of entanglement during signal accumulation.

Shion Chen, Hajime Fukuda, Yutaro Iiyama, Yuya Mino, Takeo Moroi, Mikio Nakahara, Tatsumi Nitta, Thanaporn Sichanugrist2026-03-24
⚛️ nuclear experiments

Baryon anti-Baryon Photoproduction Cross Sections off the Proton

The GlueX experiment at Jefferson Lab reports the first observations of ΛΛˉ\Lambda\bar{\Lambda} and pΛˉp\bar{\Lambda} photoproduction alongside ppˉp\bar{p} production, revealing forward-peaked angular distributions consistent with Regge-like tt-channel exchanges and a phenomenological double-exchange model, while finding no narrow resonant structures and observing a suppression of ssˉs\bar{s} pairs similar to other reactions.

F. Afzal, M. Albrecht, M. Amaryan, S. Arrigo, V. Arroyave, A. Asaturyan, A. Austregesilo, Z. Baldwin, F. Barbosa, J. Bar (…)2026-03-24