⚛️ Category

hep-ex

1442 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.

Observation of Galactic center in the sub-MeV gamma-ray band with electron-tracking Compton camera

Using an electron-tracking Compton camera during a one-day flight over Australia, researchers achieved the first direct detection of Galactic center gamma-ray emission in the 150–600 keV band with a 7.9σ significance, demonstrating the instrument's high sensitivity and validating its potential for future high-precision MeV gamma-ray surveys.

Tomonori Ikeda, Toru Tanimori, Atsushi Takada, Taito Takemura, Kei Yoshikawa, Yuta Nakamura, Ken Onozaka, Mitsuru Abe, Yoshitaka Mizumura2026-05-12⚛️ hep-ex

Searches for B0→K+π−τ+τ−B^0\to K^+\pi^-\tau^+\tau^- and Bs0→K+K−τ+τ−B_s^0\to K^+K^-\tau^+\tau^- decays

Using 5.4 fb−1^{-1} of LHCb collision data, the first searches for B0→K+π−τ+τ−B^0\to K^+\pi^-\tau^+\tau^- and Bs0→K+K−τ+τ−B_s^0\to K^+K^-\tau^+\tau^- decays were conducted, resulting in no observed signal and the establishment of new upper limits on their branching fractions, including a tenfold improvement on the previous best limit for B0→K∗(892)0τ+τ−B^0\to K^*(892)^0\tau^+\tau^-.

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 (…)2026-05-12⚛️ hep-ex

Search for light pseudoscalar bosons, pair-produced in Higgs boson decays in the four-electron final state in proton-proton collisions at s\sqrt{s} = 13 TeV

Using 138 fb−1^{-1} of 13 TeV proton-proton collision data collected by the CMS detector, this study presents the first LHC search for Higgs boson decays into pairs of light pseudoscalar bosons that subsequently decay into four electrons, finding no significant excess and setting stringent upper limits on the branching fraction down to 10−510^{-5} for pseudoscalar masses between 10 and 100 MeV.

CMS Collaboration2026-05-12⚛️ hep-ex

Complete one-loop QED corrections to Ds+D_s^+ leptonic decays and impact on the CKM unitarity test

This paper presents the first complete analytical derivation of one-loop electroweak and QED corrections to Ds+D_s^+ leptonic decays, demonstrating that incorporating these radiative effects resolves the reported violation of CKM unitarity in the second column and highlights the need for improved lattice simulations including QED corrections to further confirm the Standard Model.

Teppei Kitahara, Jun Miyamoto, Kota Sasaki2026-05-12⚛️ hep-ex

Measurement of the branching fractions and longitudinal polarisations of B(s)0→K∗0K‾∗0B^0_{(s)} \to K^{*0} \kern 0.18em \overline{\kern -0.18em K}{}^{*0} decays

Using 9 fb⁻¹ of LHCb collision data from 2011–2018, this study measures the branching fractions and longitudinal polarisation fractions of B0B^0 and Bs0B^0_s decays to K∗0K‾∗0K^{*0} \overline{K}{}^{*0}, confirming a 4.4σ\sigma tension between experimental results and theoretical predictions regarding longitudinal polarisation in B→VVB \to VV decays.

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 (…)2026-05-12⚛️ hep-ex

Amplitude Analysis and Branching Fraction Measurement of D+→π+π0π0D^+ \to \pi^+\pi^0\pi^0

Using 20.3 fb−1^{-1} of e+e−e^+e^- collision data collected by the BESIII detector, this paper presents the first amplitude analysis of the D+→π+π0π0D^+ \to \pi^+\pi^0\pi^0 decay, identifying the D+→ρ(770)+π0D^+ \to \rho(770)^+\pi^0 component as dominant and reporting precise measurements of the total branching fraction, intermediate fit fractions, and CP asymmetries.

BESIII Collaboration, M. Ablikim, M. N. Achasov, P. Adlarson, X. C. Ai, R. Aliberti, A. Amoroso, Q. An, Y. Bai, O. Bakina, Y. Ban, H. -R. Bao, V. Batozskaya, K. Begzsuren, N. Berger, M. Berlowski, M. (…)2026-05-12⚛️ hep-ex

Characterisation of the Thermoflow due to the Dry Nitrogen Flushing Scheme in the ATLAS Inner Tracker using Computational Fluid Dynamics

This paper utilizes computational fluid dynamics to characterize and optimize the dry nitrogen flushing scheme for the ATLAS Inner Tracker's High Luminosity upgrade, ensuring that moisture ingress is effectively managed to prevent condensation and protect detector electronics from damage at extreme low temperatures.

Muaaz Bhamjee, Matthew Connell, Simon Connell, Emmanuel Igumbor, Lerothodi Leeuw, Pedro Mafa, Marco Oriunno, Marcel Vreeswijk2026-05-12⚛️ hep-ex

Lepton Flavor Violating Higgs decays at the Compact Linear Collider

This paper investigates the sensitivity of the future Compact Linear Collider (CLIC) to lepton flavor violating Higgs decays (h→eμh\rightarrow e\mu, h→τμh\rightarrow\tau\mu, and h→eτh\rightarrow e\tau), projecting that it could establish 95% confidence level upper limits on their branching fractions between 10−410^{-4} and 10−510^{-5} using integrated luminosities of 4 ab−1^{-1} at 1.4 TeV and 5 ab−1^{-1} at 3 TeV.

Francisca Garay, Gabriel Vega, Philipp Roloff2026-05-12⚛️ hep-ph

A Modular Zero-Dead-Time Data Acquisition and Real-Time GPU Processing Platform for High Throughput Physics Experiments

This paper presents a modular, software-defined platform that integrates high-bandwidth PCIe digitizers with consumer GPUs to achieve continuous, zero-dead-time data acquisition and real-time processing for high-throughput physics experiments, successfully demonstrated in the WISPLC dark matter search with sustained 1 GB/s throughput and negligible data loss.

Toma-Stefan Cezar, Marios Maroudas, Dieter Horns2026-05-12⚛️ hep-ex

A study of multicavity concept applied to hexagonal coaxial haloscopes

This paper presents a study on scalable multicavity architectures for hexagonal coaxial haloscopes operating at 30 GHz, demonstrating that a triple-subcavity design with a novel rotational tuning mechanism achieves a threefold improvement in scanning rate over a single-cavity baseline while exploring the feasibility of further scaling to four subcavities within strict radial constraints.

J. M. García-Barceló, Jose R. Navarro-Madrid, Alejandro Díaz-Morcillo2026-05-12⚛️ hep-ex