⚛️ Category

hep-ex

1467 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.

A search for microscopic black holes, string balls, and sphalerons in proton-proton collisions at s\sqrt{s} = 13 TeV

Using 138 fb⁻¹ of proton-proton collision data at 13 TeV collected by the CMS detector, this study presents model-independent and model-dependent searches that exclude semiclassical black holes and string balls with masses below approximately 8.4–11.4 TeV and 9.0–10.7 TeV, respectively, while setting a 95% confidence level upper limit of 0.0034 on the fraction of quark-quark interactions producing electroweak sphalerons above 9 TeV.

CMS Collaboration2026-04-14⚛️ hep-ex

Measurement of inclusive production of charmonium states in bb-hadron decays via their decay into ϕϕ\phi \phi

Using LHCb Run 2 data, this study measures the inclusive production branching fractions of χc0\chi_{c0}, χc1\chi_{c1}, and χc2\chi_{c2} charmonium states in bb-hadron decays via their ϕϕ\phi\phi decay mode, reports the production rate of ηc(2S)\eta_c(2S), and achieves the most precise measurement to date of the ηc(1S)\eta_c(1S) mass.

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 (…)2026-04-14⚛️ hep-ex

Observation of the charmless purely baryonic decay Λb0→Λppˉ\Lambda_b^{0} \to \Lambda p \bar{p} at LHCb

Using the full Run 2 LHCb dataset, the first observation of the charmless purely baryonic decay Λb0→Λppˉ\Lambda_b^{0} \to \Lambda p \bar{p} is reported with a statistical significance of 5.1σ5.1\sigma, yielding a measured relative branching fraction of (5.13±1.28stat±0.27syst)×10−2(5.13 \pm 1.28_{\rm stat} \pm 0.27_{\rm syst})\times 10^{-2}.

Alexande Brea Rodriguez2026-04-14⚛️ hep-ex

Implementation and commissioning of an experimental system towards sub-eV axion-like particle searches with 0.1 PW laser at ELI-NP

This paper reports the successful development and commissioning of an integrated experimental system at ELI-NP, utilizing a 0.1 PW laser to search for axion-like particles via Four-Wave Mixing, which has been validated for background studies and is ready for a stepwise energy scale-up from 20 mJ to 2.5 J.

Yoshihide Nakamiya, Kensuke Homma, Madalin-Mihai Rosu, Liviu Neagu, Mihai Cuciuc, Vanessa Rozelle Maria Rodrigues, Stefan Ataman, Catalin Chiochiu, Georgiana Giubega, Kyle Juedes, Jonathan Tamlyn, Ste (…)2026-04-14⚛️ hep-ex

Neutron Reconstruction via Blips in Liquid Argon Time Projection Chambers

This paper presents a simulation-based proof-of-concept demonstrating that isolated MeV-scale energy deposits ("blips") from neutron inelastic scattering in Liquid Argon Time Projection Chambers can be used to identify and reconstruct the direction and energy of final-state neutrons, thereby enhancing neutrino interaction studies such as neutrino-antineutrino separation.

Miguel Hernandez Morquecho, Bryce Littlejohn, Paola Sala, Linyan Wan2026-04-14⚛️ hep-ex

First observation of $CP$ violation and measurement of polarization in B+→ρ(770)0K∗(892)+B^+\to\rho(770)^0 K^*(892)^+ decays

Using LHCb data, this study performs an amplitude analysis of B+→ρ(770)0K∗(892)+B^+\to\rho(770)^0K^*(892)^+ decays to measure their polarization fractions and $CP$ asymmetries, resulting in the first observation of $CP$ violation in this channel with a significance exceeding nine standard deviations.

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 (…)2026-04-13⚛️ hep-ex