# Search for Type-III Seesaw heavy leptons using proton-proton collisions at $\sqrt{s}= 13$ TeV with the ATLAS detector.

Carratta G.

Comunicazione
I - Fisica nucleare e subnucleare
Aula 32C-3 - Lunedì 17 h 16:00 - 19:00
The small neutrino masses required by oscillations are difficult to accommodate in a natural way through a pure Standard Model Yukawa coupling. Type-III See-Saw mechanism is proposed beyond the SM model, introducing at least two new triplets of fermionic fields with zero hypercharge in the adjoint representation of SU(2)L, resulting in two heavy Dirac charged leptons and a heavy Majorana neutral lepton. I will present the search for the heavy leptons based on the $pp\rightarrow W^{\star}\rightarrow LN_{0}\rightarrow W\nu W l$ process using the data collected by the ATLAS detector at $\sqrt{s}=13$ TeV.