⚛️ 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.

⚛️ high-energy experiments

A measurement of the Higgs boson mass in the diphoton decay channel in proton-proton collisions at s\sqrt{s} = 13 TeV

Using proton-proton collision data at 13 TeV collected by the CMS detector from 2016 to 2018, this study measures the Higgs boson mass in the diphoton decay channel to be 125.13 ± 0.15 GeV, achieving improved precision through refined calibration and new analysis techniques, and combines this result with previous measurements at 7 and 8 TeV to obtain a combined mass of 125.06 ± 0.14 GeV.

CMS Collaboration2026-07-31
⚛️ high-energy experiments

Design and beam-test characterization of the CRILIN semi-homogeneous crystal calorimeter

This paper presents the design, construction, and beam-test characterization of the CRILIN prototype, a high-granularity semi-homogeneous PbF2_2 crystal calorimeter read out by SiPMs, demonstrating its suitability for future lepton-collider experiments through excellent time resolution (below 20 ps at high energies), precise energy resolution, and effective longitudinal segmentation for shower correction.

S. Ceravolo, M. Cavallina, V. Ciccarella, E. Di Meco, E. Diociaiuti, R. Gargiulo, Q. Han, E. Leonardi, D. Lucchesi, M. M (…)2026-07-31
⚛️ high-energy experiments

Search for Lorentz-boosted di-τ\tau resonances produced in association with top quark pairs in s=13\sqrt{s}=13 TeV pp collisions with the ATLAS detector

Using 140 fb−1^{-1} of 13 TeV proton-proton collision data collected by the ATLAS detector, this study presents a search for Lorentz-boosted pseudoscalar resonances decaying into hadronic τ\tau-lepton pairs in association with top quark pairs, finding no significant deviation from the Standard Model and setting upper limits on the production cross-section for masses between 20 and 85 GeV.

ATLAS Collaboration2026-07-31
⚛️ nuclear experiments

Extraction of σTT\sigma_{TT} for Proton, Neutron, Deuteron and 3^3He from Quasi-real Photon Scattering

This paper reports the extraction of polarized photoproduction cross-sections for the proton, neutron, deuteron, and 3^3He by extrapolating electron scattering data from Jefferson Lab experiments to the real photon point, revealing that while proton results align with real photon data, the neutron and deuteron exhibit enhanced strength in the Δ(1232)\Delta(1232) region that better supports isospin symmetry.

YiLei Li, B. Callahan, M. M. Dalton, A. Deur, O. Larson, A. Rask, D. W. Upton, X. Zheng2026-07-31
⚛️ high-energy experiments

Search for exotic Higgs boson decays H →\to AA\mathcal{AA} with AA\mathcal{AA} →\to γγ\gamma\gamma in events with a semi-merged topology 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 experiment, this study searches for exotic Higgs boson decays into two light particles (A\mathcal{A}) that subsequently decay into four photons, where one A\mathcal{A} produces a semi-merged diphoton system and the other yields two resolved photons, finding no evidence of such events and setting the most stringent limits to date on the production cross section times branching fraction for A\mathcal{A} masses between 1 and 5 GeV.

CMS Collaboration2026-07-30
⚛️ high-energy experiments

Evidence for the rare decay B+→Λˉpμ+μ−B^{+} \to \bar \Lambda p \mu^{+} \mu^{-}

Using LHCb proton-proton collision data at 13 TeV, researchers report evidence for the rare decay B+→Λˉpμ+μ−B^{+} \to \bar \Lambda p \mu^{+} \mu^{-} with a significance of 3.5 standard deviations in the low invariant-mass region of the Λˉp\bar \Lambda p system, measuring a branching fraction of approximately 1.70×10−81.70 \times 10^{-8} while setting upper limits for the high-mass region.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. Adefisoye, B. A (…)2026-07-30
⚛️ lattice

Lattice determination of the neutrino background for J/ψ→γ+invisibleJ/ψ\rightarrow γ+ \textrm{invisible}

This paper presents the first lattice QCD calculation of the irreducible Standard Model background for the decay J/ψ→γννˉJ/\psi \to \gamma \nu\bar{\nu}, determining its branching fraction to be 1.04(7)(8)×10−101.04(7)(8)\times 10^{-10} and providing a critical theoretical benchmark for future dark matter searches via radiative invisible quarkonium decays.

Yu Meng, Ning Li, Chuan Liu, Haobo Yan, Ke-Long Zhang, Xue-Ze Zhang2026-07-30
⚛️ high-energy experiments

Automated NRQCD and NRQED simulations of quarkonium and leptonium production with P-wave states and physical-mass effects

This paper introduces the MadSONS module for MadGraph5_aMC@NLO, which automates the simulation of quarkonium and leptonium production by extending previous S-wave capabilities to include P-wave states via dual-number derivatives and physical-mass effects, thereby improving the description of LHCb data for J/ψ+ψ(2S)J/\psi + \psi(2{\rm S}) production.

Luca Maxia, Hua-Sheng Shao, Lukas Simon2026-07-30