Search for Majorana neutrinos in same-sign WW scattering events from pp collisions at √s=13 TeV

0576445 - FZÚ 2024 RIV DE eng J - Článek v odborném periodiku
Aad, G. - Abbott, B. - Abeling, K. - Chudoba, Jiří - Federičová, Pavla - Hejbal, Jiří - Jačka, Petr - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Latoňová, Věra - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … celkem 2931 autorů
Search for Majorana neutrinos in same-sign WW scattering events from pp collisions at √s=13 TeV.
European Physical Journal C. Roč. 83, č. 9 (2023), č. článku 824. ISSN 1434-6044. E-ISSN 1434-6052
Výzkumná infrastruktura: CERN-CZ III - 90240
Institucionální podpora: RVO:68378271
Klíčová slova: operator: Weinberg * jet: hadronic * final state: ((n)jet dilepton)se
Obor OECD: Particles and field physics
Impakt faktor: 4.4, rok: 2022
Způsob publikování: Open access

A search for Majorana neutrinos in same-sign WW scattering events is presented. The analysis uses s=13s ​=13 TeV proton–proton collision data with an integrated luminosity of 140 fb−1−1 recorded during 2015–2018 by the ATLAS detector at the Large Hadron Collider. The analysis targets final states including exactly two same-sign muons and at least two hadronic jets well separated in rapidity. The modelling of the main backgrounds, from Standard Model same-sign WW scattering and WZ production, is constrained with data in dedicated signal-depleted control regions. The distribution of the transverse momentum of the second-hardest muon is used to search for signals originating from a heavy Majorana neutrino with a mass between 50 GeV and 20 TeV. No significant excess is observed over the background expectation. The results are interpreted in a benchmark scenario of the Phenomenological Type-I Seesaw model.
Trvalý link: https://hdl.handle.net/11104/0345983