SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 135: Top Mass, Top BSM
T 135.6: Vortrag
Donnerstag, 23. März 2023, 18:45–19:00, HSZ/0201
Search for heavy right-handed Majorana neutrinos in tt decays — •Tongbin Zhao1,2, Binish Batool1, Beatrice Cervato1, Markus Cristinziani1, Carmen Diez Pardos1, Ivor Fleck1, Arpan Ghosal1, Gabriel Gomes1, Jan Joachim Hahn1, Vadim Kostyukhin1, Buddhadeb Mondal1, Amartya Rej1, Katharina Voss1, and Wolfgang Walkowiak1 — 1Center for Particle Physics Siegen, Experimentelle Teilchenphysik, Universität Siegen — 2Shandong University, China
A search for heavy right-handed Majorana neutrinos is performed with the Run-2 dataset recorded from 2015 to 2018 with the ATLAS detector at the CERN Large Hadron Collider and is based on √s = 13 TeV proton–proton collision data with an integrated luminosity of 139 fb−1. The targeted process is tt: one of the top quarks decays into a pair of same-sign same-flavour leptons (electrons or muons), a b-quark and two light quarks, while the other decays into a b-quark and two light quarks. The final states feature same-sign dilepton signatures. This analysis is the first search for heavy neutrinos using tt events.
A multivariate analysis is employed in order to improve the sensitivity. Several control regions are defined to estimate the main backgrounds. With profile likelihood fits using the ee and µµ channels, we expect to reach good sensitivities for the mixing parameters in the mass region 15–80 GeV.