1384 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.
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.
This paper revisits and clarifies the theoretical argument that MS-bar parton distribution functions remain non-negative within the perturbative region, addressing recent findings of negativity at low scales and providing an estimate for the threshold scale above which positivity is guaranteed.
Using a sample of 10 billion events collected by the BESIII detector, this study presents improved measurements of the branching fractions for and , establishes an upper limit for the rare decay , and reports the first extraction of the doubly virtual isovector form factor from an amplitude analysis of .
This paper calculates the angular momentum of spherical false vacuum bubbles induced by cosmological perturbations during a first-order phase transition in a dark sector, revealing that the resulting dimensionless spin parameter of potential primordial black holes spans a wide range from to $10$ and follows a specific scaling relation with the transition time scale, bubble wall velocity, and temperature ratio between the dark and visible sectors.
This paper interprets nine statistically significant LHC decay channels around 650 GeV as evidence for a sequence of spin-2 Kaluza-Klein graviton resonances (specifically T690) and potential spin-0 scalars within a composite or Randall-Sundrum framework, suggesting that these findings support the case for future high-luminosity colliders to produce and study these new particles.
The ATLAS collaboration performed a search for Higgs boson pair production in the final state using 308 fb of proton-proton collision data at 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 while constraining the Higgs self-coupling modifier to the range .
This paper recasts existing analyses to search for charged Higgs bosons decaying via the $WZ$ 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 excess supports the existence of a GeV boson.
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 and its spin-zero partners.
Using 138 fb of proton-proton collision data at = 13 TeV collected by the CMS detector, this study presents inclusive and differential measurements of the cross section and its ratio to the cross section, all of which are found to be in agreement with Standard Model predictions.
This paper presents PrecisionSM, a curated database developed within the STRONG2020 and RMCL2 initiatives that compiles annotated low-energy hadronic cross-section data to support precise Standard Model tests via the muon anomalous magnetic moment, currently featuring dominant channels like , , and with plans for further expansion.