LLP2025: Fifteenth workshop of the Long-Lived Particle Community

Session

Theory and pheno III

3 Jun 2025, 17:00

València - ADEIT

Conveners

Theory and pheno III

• Jacobo Lopez Pavon (IFIC, CSIC-Universitat de València (Spain))
• Juliette Alimena (DESY)

31. Status of GeV-scale LLPs

Maksym Ovchynnikov (CERN)

03/06/2025, 17:00

In this talk, I explore the search for feebly interacting new physics particles (FIPs) in the GeV mass range from a theoretical perspective. I begin by emphasizing the complementarity between astrophysical and cosmological probes in exploring the FIP parameter space. I then survey the landscape of intensity frontier experiments designed to detect FIPs, addressing the principal challenge -...

41. Leptophilic ALPs in Laboratory Experiments

Marco Fedele

03/06/2025, 17:30

In this talk I will review the collider phenomenology of leptophilic axion-like particles (ALPs), i.e. pseudoscalar particles that couple only to charged leptons. Loops of charged leptons induce effective interactions of the ALPs with photons, which depend on the momenta of the interacting particles and differ between pseudoscalar and derivative lepton couplings. I will systematically discuss...

21. Underexplored Challenges in LLP/FIP Searches at Colliders and Cosmology

Brij Kishor Jashal (Rutherford appelton laboratory)

03/06/2025, 17:50

Current searches for Long-Lived Particles (LLPs) and Feebly Interacting Particles (FIPs) face critical systematic limitations in collider detector geometries and cosmological analyses. At the LHC, experiments like ATLAS, CMS, and LHCb employ displaced vertex triggers that approximate detection efficiency with step functions, neglecting the probabilistic survival probability $P_{\text{surv}}(L)...

37. Displaced vertices of a light neutralino from $B$-meson decays with baryon-number-violating R-parity violation at Belle II

Nicolas Neill

In R-parity-violating (RPV) supersymmetry (SUSY), GeV-scale bino-like neutralinos are allowed by all constraints and can be produced in association with a baryon in $B$-meson decays via certain $\bar U \bar D \bar D$ operators. We investigate theoretical scenarios with a pair of non-vanishing RPV couplings at the low-energy scale. With one RPV coupling governing the neutralino production rate...

82. TBC

Fabián Esteban Hernández Pinto (Universidad de La Serena (CL)), Fabián Hernández Pinto (Universidad Técnica Federico Santa María)

Remote

18. Unlocking the Inelastic Dark Matter Window with Vector Mediators

Ana Luisa Foguel da Silva (Universidade de São Paulo)

Remote

Despite the robust cosmological and astrophysical evidence confirming the existence of a non-baryonic matter component in the Universe, the underlying nature of Dark Matter (DM) remains a mystery. Among the several possible scenarios, light DM candidates thermally produced in the early Universe are especially interesting, since their abundance could be set via the standard...