⚛️ Category

hep-ex

2131 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

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, Y (…)2026-05-12
⚛️ high-energy experiments

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. A (…)2026-05-12
⚛️ high-energy experiments

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
⚛️ high-energy experiments

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
⚛️ high-energy experiments

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. A (…)2026-05-12
⚛️ high-energy experiments

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. Bakin (…)2026-05-12
⚛️ high-energy experiments

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 Vree (…)2026-05-12
⚛️ phenomenology

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