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The LLP2025 workshop, held June 2-6, 2025, in Valencia, Spain, marked the fifteenth gathering of the Long-Lived Particle (LLP) Community. Hosted by the Instituto de Física Corpuscular (IFIC), this event united researchers studying hypothetical particles with minimal Standard Model couplings that could illuminate fundamental physics questions.
The workshop featured discussions on theoretical frameworks, experimental techniques, and recent advances in LLP searches across major experiments, including ATLAS, CMS, LHCb, and dedicated experiments like MoEDAL, FASER, and MATHUSLA. Key topics encompassed Heavy Neutral Leptons, dark scalars, dark photons, axion-like particles, and exotic Higgs boson decays to LLPs.
Among the presentations, the speaker contributed a talk on "Unexplored Challenges in LLP/FIP Searches at Cosmology and Colliders," addressing the intersection between cosmological observations and collider physics in the context of long-lived and feebly interacting particles.
The workshop emphasised how LLPs connect to central physics questions, including neutrino masses, dark matter, and the baryon asymmetry of the universe, while setting directions for future research in this rapidly evolving field. The collaborative discussions between theorists and experimentalists highlighted current challenges and promising opportunities for discovering physics beyond the Standard Model through LLP searches. A summary of this workshop will be presented in this seminar.