Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 1: Searches/BSM I (HNL, ETmiss+X)
T 1.3: Vortrag
Montag, 31. März 2025, 17:15–17:30, ZHG010
Searching for type I seesaw mechanism in a two Heavy Neutral Leptons scenario at FCC-ee — Sehar Ajmal1, Patrizia Azzi2, •Sofia Giappichini3, Markus Klute3, Orlando Panella1, Matteo Presilla3, and Xunwu Zuo3 — 1INFN Perugia, Perugia, Italy — 2INFN Padova, Padova, Italy — 3KIT, Karlsruhe, Germany
This contribution reports the search for heavy neutral leptons (HNL) in the type I seesaw mechanism at the Future Circular Collider in its e+*e* stage (FCC-ee), considering an integrated luminosity of 204 ab−1 collected at the Z pole. The study examines two generations of heavy neutral leptons produced in association with Standard Model (SM) neutrinos and decaying to a purely leptonic final state. This theoretical framework can explain neutrino oscillations and other open questions of the SM, providing a broader perspective on the relevance of this experimental search. The analysis is performed using a fast simulation of the IDEA detector concept to study potential HNL interactions at the FCC-ee. The sensitivity contours are obtained from a selection of kinematic variables aimed at improving the signal-to-background ratio for the prompt production case. In the case of long-lived HNLs, the background can be almost fully eliminated by exploiting their displaced decay vertices. The study shows that the FCC-ee has a significant sensitivity to observing these objects in a region of the phase space not accessible by other experiments.
Keywords: heavy neutral leptons; long-lived particles; Majorana; FCC