⚛️ Category

hep-ex

2144 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

Bˉ→D(∗)ℓνˉ\bar B\to D^{(*)}\ell\bar \nu Branching Ratios and Evidence for Isospin Breaking in Υ(4S)\Upsilon(4S) Decays

This paper presents a new method and comprehensive analysis of Bˉ→D(∗)ℓνˉ\bar B\to D^{(*)}\ell\bar \nu decays to determine the Υ(4S)\Upsilon(4S) production fraction ratio R±0R^{\pm0}, providing evidence for isospin violation at R±0=1.062(19)R^{\pm0}=1.062(19) and revising branching fractions to potentially alleviate the VcbV_{cb} puzzle.

Martin Jung, Stefan Schacht2026-04-10
⚛️ high-energy experiments

Search for the lepton-flavour violating decays B+→π+μ±e∓B^+ \to \pi^+ \mu^\pm e^\mp

The LHCb collaboration presents the first search for the lepton-flavour violating decay B+→π+μ±e∓B^+ \to \pi^+ \mu^\pm e^\mp using 9 fb−1^{-1} of proton-proton collision data, finding no significant signal and setting a new world-record upper limit on the branching fraction of 1.8×10−91.8 \times 10^{-9}, which provides the first constraint on such b→db \to d transitions at the LHC.

LHCb collaboration, R. Aaij, M. Abdelfatah, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. (…)2026-04-10
⚛️ high-energy experiments

A framework and implementation for data-driven trigger efficiency estimation at LHCb

This paper introduces a data-driven framework for estimating trigger efficiencies at LHCb and presents the design, implementation, and performance of the centralised software package TriggerCalib, which facilitates these calculations and uncertainty estimations for physics analyses.

Johannes Albrecht, James Andrew Gooding, Maxim Lysenko, Abhijit Mathad, Alessandro Scarabotto, Tomasz Skwarnicki2026-04-09
⚛️ high-energy experiments

Observation of W+W−γW^{+}W^{-}\gamma production in $pp$ collisions at s\sqrt{s} = 13 TeV with the ATLAS detector and constraints on anomalous quartic gauge-boson couplings

Using 140 fb−1^{-1} of 13 TeV proton-proton collision data, the ATLAS experiment reports the first observation of W+W−γW^{+}W^{-}\gamma triboson production with a significance of 5.9 standard deviations and derives constraints on anomalous quartic gauge-boson couplings within the effective field theory framework.

ATLAS Collaboration2026-04-09
⚛️ nuclear experiments

Characterizing the initial state and dynamical evolution in XeXe and PbPb collisions using multiparticle cumulants

Using the CMS detector, this study presents the first measurements of correlations among mixed-order moments of two and three flow harmonics in XeXe and PbPb collisions, leveraging the distinct nuclear shapes of doubly-magic 208^{208}Pb and triaxially deformed 129^{129}Xe to probe initial-state geometry fluctuations and constrain the nonlinear hydrodynamic response of the quark-gluon plasma.

CMS Collaboration2026-04-09
⚛️ high-energy experiments

Observation and investigation of the Tccˉ1(4430)+T_{c\bar{c}1}(4430)^{+} structure in B+→ψ(2S)KS0π+B^{+} \to \psi(2S) K_{\text{S}}^{0} \pi^{+} decays

Using a four-dimensional amplitude analysis of proton-proton collision data from the LHCb experiment, this study confirms the existence of the exotic Tccˉ1(4430)+T_{c\bar{c}1}(4430)^{+} structure in B+→ψ(2S)KS0π+B^{+} \to \psi(2S) K_{\text{S}}^{0} \pi^{+} decays and investigates its properties through both Flatté parametrization and triangle singularity mechanisms.

LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb, C. Abellan Beteta, F. Abudinén, T. Ackernley, A. A. Adefisoye, B. A (…)2026-04-09
⚛️ high-energy experiments

Probing tt-channel single top-quark and antiquark production via differential cross-section measurements at s=\sqrt{s}=\SI{13}{\TeV} with the ATLAS detector

Using the full ATLAS Run 2 dataset at s=13\sqrt{s}=13 TeV, this paper presents the first measurement of the differential ratio between tt-channel single top-quark and antiquark production cross-sections, comparing these results to theoretical predictions and deriving constraints on the Wilson coefficient CQq3,1C^{3,1}_{Qq} within an effective field theory framework.

Lukas Kretschmann2026-04-09
⚛️ nuclear experiments

Nucleon axial-vector form factor and radius from radiatively-corrected antineutrino scattering data

This paper applies radiative corrections to recent MINERvA antineutrino-hydrogen scattering data to extract the nucleon axial-vector form factor and radius, thereby enabling more precise comparisons with lattice QCD predictions and reducing uncertainties in neutrino interaction modeling.

Oleksandr Tomalak, Aaron S. Meyer, Clarence Wret, Tejin Cai, Richard J. Hill, Kevin S. McFarland2026-04-09