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.

Low-Energy Radon Backgrounds from Electrode Grids in Dual-Phase Xenon TPCs

This paper presents a first-principle model explaining low-energy radon-induced backgrounds from electrode grids in dual-phase xenon TPCs, which aligns with data from the LZ and LUX experiments and offers strategies for mitigating these backgrounds in future dark matter searches.

D. S. Akerib, A. K. Al Musalhi, F. Alder, B. J. Almquist, S. Alsum, C. S. Amarasinghe, A. Ames, T. J. Anderson, N. Angelides, H. M. Araújo, J. E. Armstrong, M. Arthurs, X. Bai, A. Baker, J. Balajthy (…)2026-02-25⚛️ hep-ex

Evidence of medium response to hard probes using correlations of Z bosons with hadrons in heavy ion collisions

This paper presents the first evidence of medium response to hard probes in heavy ion collisions by observing significant modifications in the distributions of low transverse momentum hadrons recoiling against Z bosons in lead-lead collisions, consistent with theoretical predictions of a hydrodynamic wake generated by energy depletion in the quark-gluon plasma.

CMS Collaboration2026-02-24⚛️ nucl-ex

Temperature dependence of the long-term annealing behavior of neutron irradiated diodes from 8-inch p-type silicon wafers

This study investigates the isothermal annealing behavior of neutron-irradiated p-type silicon pad diodes from 8-inch wafers across a range of fluences and temperatures to extract annealing time constants, thereby improving the Hamburg model's ability to predict long-term radiation damage effects in the CMS High-Granularity Calorimeter sensors for the High-Luminosity LHC.

Leena Diehl, Oliwia Kaluzinska, Marie Mühlnikel, Max Andersson, Natalya Gerassyova, Jenan Amer, Eva Sicking, Dana Groner, Jan Kieseler, Matteo Defranchis2026-02-24⚛️ hep-ex

Deploying a Hybrid PVFinder Algorithm for Primary Vertex Reconstruction in LHCb's GPU-Resident HLT1

This paper presents the development and integration of a hybrid deep neural network for primary vertex reconstruction into LHCb's GPU-resident HLT1 framework, detailing the challenges of real-time constraints and data layout translation while outlining a roadmap for significant performance improvements through mixed-precision computing and model compression.

Simon Akar, Mohamed Elashri, Conor Henderson, Michael Sokoloff2026-02-24⚛️ hep-ex

Observation of ttˉγγt\bar{t}γγ production at s=\sqrt{s}=13 TeV with the ATLAS detector

Using 140 fb1^{-1} of proton-proton collision data at s=13\sqrt{s}=13 TeV collected by the ATLAS detector, this paper reports the first observation of top-quark pair production in association with two photons (ttˉγγt\bar{t}\gamma\gamma) with a significance of 5.2 standard deviations and measures its fiducial cross section to be 2.420.53+0.582.42^{+0.58}_{-0.53} fb.

ATLAS Collaboration2026-02-23⚛️ hep-ex

First evidence of $CP$ violation in beauty baryon to charmonium decays

Using LHCb data from 2015–2018, researchers observed the first evidence of CP violation in beauty baryon decays to charmonium, measuring a combined asymmetry difference of 4.31±1.06±0.28%4.31 \pm 1.06 \pm 0.28\% with a significance of 3.9σ3.9\sigma.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. Adefisoye, B. Adeva, M. Adinolfi, P. Adlarson, C. Agapopoulou, C. A. Aidala, Z. Ajaltouni, S. A (…)2026-02-23⚛️ hep-ex