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Search for Majorana neutrinos in same-sign WW scattering events from pp collisions at s=13 TeV.
- Source :
-
European Physical Journal C -- Particles & Fields . Sep2023, Vol. 83 Issue 9, p1-26. 26p. - Publication Year :
- 2023
-
Abstract
- A search for Majorana neutrinos in same-sign WW scattering events is presented. The analysis uses s = 13 TeV proton–proton collision data with an integrated luminosity of 140 fb - 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. In addition, the sensitivity to the Weinberg operator is investigated. Upper limits at the 95% confidence level are placed on the squared muon-neutrino–heavy-neutrino mass-mixing matrix element | V μ N | 2 as a function of the heavy Majorana neutrino's mass m N , and on the effective μ μ Majorana neutrino mass | m μ μ | . [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14346044
- Volume :
- 83
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- European Physical Journal C -- Particles & Fields
- Publication Type :
- Academic Journal
- Accession number :
- 173026463
- Full Text :
- https://doi.org/10.1140/epjc/s10052-023-11915-y