⚛️ Category

hep-ex

2142 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

Odd Physics Off the Diagonal: Constraining CP-violating SMEFT with Quantum Tomography

This paper proposes a novel approach using quantum tomography to reconstruct the spin density matrix of diboson systems, enabling the simultaneous and superior constraint of both CP-even and CP-violating SMEFT operators by exploiting full Beyond-Standard-Model signatures, including pure quadratic new physics terms that are typically degenerate in traditional polarisation-blind observables.

Avalon Roberts, Patrick Dougan, Alexander Oh, Savanna Shaw2026-04-24
⚛️ high-energy experiments

Study of Higgs boson pair production in the HH→bb‾γγHH \rightarrow b \overline{b} γγ final state with 308 fb−1^{-1} of data collected at s=\sqrt{s} = 13 TeV and 13.6 TeV by the ATLAS experiment

The ATLAS collaboration performed a search for Higgs boson pair production in the bbˉγγb\bar{b}\gamma\gamma final state using 308 fb−1^{-1} of proton-proton collision data at s=13\sqrt{s} = 13 and 13.6 TeV, finding no significant excess over the Standard Model prediction and setting a 95% confidence-level upper limit on the production cross-section of μHH<3.7\mu_{HH} < 3.7 while constraining the Higgs self-coupling modifier to the range −1.6<κλ<6.6-1.6 < \kappa_\lambda < 6.6.

ATLAS Collaboration2026-04-23
⚛️ high-energy experiments

Searching for a Charged Higgs Boson in Top-Quark Decays via the WZWZ Mode

This paper recasts existing ttˉZt\bar{t}Z analyses to search for charged Higgs bosons decaying via the WZWZ channel, setting sub-permille limits on their production that constrain the triplet vacuum expectation value more stringently than previous modes or electroweak precision data, while a 2σ2\sigma excess supports the existence of a ≈152\approx152 GeV boson.

Saiyad Ashanujjaman, Andreas Crivellin, Siddharth P. Maharathy, Bruce Mellado2026-04-23
⚛️ lattice

Fully charm tetraquark production at hadronic collisions with gluon radiation effects

This paper presents the first complete next-to-leading order QCD calculation for fully charm tetraquark production at hadronic collisions, incorporating gluon radiation effects through resummation and utilizing LHCb and CMS data to extract universal long-distance matrix elements and predict kinematic distributions for the X(6900)X(6900) and its spin-zero partners.

Yefan Wang, Ruilin Zhu2026-04-23
⚛️ high-energy experiments

Inclusive and differential measurements of the ttˉγ\mathrm{t\bar{t}}\gamma cross section and the ttˉγ\mathrm{t\bar{t}}\gamma / ttˉ\mathrm{t\bar{t}} cross section ratio 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 presents inclusive and differential measurements of the ttˉγ\mathrm{t\bar{t}}\gamma cross section and its ratio to the ttˉ\mathrm{t\bar{t}} cross section, all of which are found to be in agreement with Standard Model predictions.

CMS Collaboration2026-04-23
⚛️ high-energy experiments

Technically Natural Suppression of Fifth Force

This paper proposes a Z2Z_2-symmetric mirror extension of the Standard Model within a bi-conformal gravity framework where spontaneous scale invariance breaking generates a light scalaron that naturally suppresses fifth-force couplings via symmetry, predicting a specific correlation between the force strength and scalar mass that aligns with next-generation experimental targets without relying on environmental screening mechanisms.

Kensuke Homma, Taishi Katsuragawa, Shinya Matsuzaki2026-04-23
⚛️ high-energy experiments

Baryon-Meson Sum Rule for b→sννˉb \to s \nu\bar\nu

This paper establishes a model-independent sum rule linking the branching fractions of Λb→Λννˉ\Lambda_b \to \Lambda \nu\bar\nu and B→K(∗)ννˉB \to K^{(\ast)} \nu\bar\nu decays, which remains exact despite numerous Wilson coefficients and shares numerical coefficients with the b→cb\to c semileptonic counterpart, thereby providing a powerful tool to discriminate new-physics scenarios involving left-handed neutrinos.

Teppei Kitahara, Manas Kumar Mohapatra, Kota Sasaki2026-04-23