LLP2025: Fifteenth workshop of the Long-Lived Particle Community

Session

ATLAS, CMS, and LHCb results III

5 Jun 2025, 17:20

València - ADEIT

Conveners

ATLAS, CMS, and LHCb results III

• Emma Torro Pastor (Univ. of Valencia and CSIC (ES))
• Carlos Vazquez Sierra (Universidade da Coruña (ES))

53. Limits on long-lived axion-like particles from previous searches for exotic decays of the Higgs boson with the ATLAS detector

Marzieh Bahmani (Humboldt University of Berlin (DE))

05/06/2025, 17:20

Two ATLAS searches for anomalous decays of the Higgs boson into pseudo-scalar particles are used to set exclusion limits for models containing decays to long-lived axion-like particles (ALPs). Both searches use the full Run~2 data set of $140 fb^{−1}$ of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS experiment. The first search involves the decay of the...

77. CMS: VLLs in the muon system

Daniel Guerrero (Fermi National Accelerator Lab. (US))

05/06/2025, 17:40

Remote

A first search is presented for vector-like leptons (VLLs) decaying into a light long-lived pseudoscalar boson and a standard model $\tau$ lepton. The pseudoscalar boson is assumed to have a mass of 2 GeV and to decay exclusively into a pair of photons. It is identified using the CMS muon system. The analysis is carried out using a data set of proton-proton collisions at a...

54. Search for massive, long-lived charged particles with large specific ionisation and low-$\beta$ in $140~\mathrm{fb^{-1}}$ of $pp$ collisions at $\sqrt{s} = 13$~TeV using the ATLAS experiment

Judith Höfer (IFIC (Univ. of Valencia and CSIC) (ES))

05/06/2025, 18:00

This paper presents a search for massive, charged, long-lived particles with the ATLAS detector at the Large Hadron Collider using an integrated luminosity of $140 fb^{−1}$ of proton-proton collisions at $\sqrt{s}=13$ TeV. These particles are expected to move significantly slower than the speed of light. In this paper, two signal regions provide complementary sensitivity. In one region, events...

49. Search for long-lived particles in the ATLAS hadronic calorimeter in association with leptons or jets using 13 TeV collision data

Gordon Watts (University of Washington (US))

05/06/2025, 18:20

A search for neutral long-lived particles (LLPs) decaying in the ATLAS hadronic calorimeter using $140 fb^{−1}$ of proton-proton collisions at $s=\sqrt{13}$ TeV delivered by the LHC is presented. The analysis is composed of three channels. The first targets pair-produced LLPs, where at least one LLP is produced with sufficiently low boost that its decay products can be resolved as separate...