LLP2025: Fifteenth workshop of the Long-Lived Particle Community

Session

ATLAS, CMS, and LHCb results II

5 Jun 2025, 10:10

València - ADEIT

Conveners

ATLAS, CMS, and LHCb results II

• Andrii Usachov (Nikhef and VU (NL))
• Bryan Zaldivar (IFT Madrid)

50. Search for heavy neutral leptons in decays of W bosons using leptonic and semi-leptonic displaced vertices in $\sqrt{s}$ = 13 TeV pp collisions with the ATLAS detector

Guglielmo Frattari (Brandeis University (US))

05/06/2025, 10:10

A search is performed for long-lived heavy neutral leptons (HNLs), produced through the decay of a W boson along with a muon or electron. Two channels are explored: a leptonic channel, in which the HNL decays into two leptons and a neutrino, and a semi-leptonic channel, in which the HNL decays into a lepton and a charged pion. The search is performed with $140 fb^{−1}$ of $\sqrt{s} = 13$ TeV...

85. CMS: Compressed electroweakinos in events with a low-momentum, displaced track

Samuel Louis Bein (Universite Catholique de Louvain (UCL) (BE))

05/06/2025, 10:30

Remote

A search is presented for higgsino dark matter (DM) in final states with a low momentum (soft), isolated track and large missing transverse momentum. In the minimal supersymmetric standard model (MSSM), charginos are most often produced in association with a nearly mass-degenerate neutralino or another chargino, and predominantly decay into the lightest neutralino (DM candidate) and...

57. Results and prospects of an LHCb Run 3 HNL analysis with very displaced vertex reconstruction

Spencer Collaviti (EPFL), Spencer Collaviti

05/06/2025, 10:50

Heavy Neutral Leptons (HNLs) are theoretical long-lived particles introduced to the Standard Model (SM) to explain, among other things, the observed, non-zero SM neutrino mass. In this presentation plans and potential sensitivity of an HNL analysis leveraging the Run 3 (2022-2026) data set of the Large Hadron Collider beauty (LHCb) experiment are discussed. In particular, a novel analysis...