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- Title
Search for Majorana neutrinos in same-sign WW scattering events from pp collisions at s=13 TeV.
- Authors
Aad, G.; Abbott, B.; Abeling, K.; Abicht, N. J.; Abidi, S. H.; Aboulhorma, A.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Abusleme Hoffman, A. C.; Acharya, B. S.; Adam Bourdarios, C.; Adamczyk, L.; Adamek, L.; Addepalli, S. V.; Addison, M. J.; Adelman, J.; Adiguzel, A.; Adye, T.; Affolder, A. A.
- 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 | .
- Subjects
PROTON-proton interactions; NEUTRINOS; MOMENTUM distributions; NEUTRINO mass; LARGE Hadron Collider; CONFIDENCE intervals
- Publication
European Physical Journal C -- Particles & Fields, 2023, Vol 83, Issue 9, p1
- ISSN
1434-6044
- Publication type
Article
- DOI
10.1140/epjc/s10052-023-11915-y