A search for Majorana neutrinos in same-sign W W 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 samesign W W scattering and W Z 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 |VμN | 2 as a function of the heavy Majorana neutrino’s mass mN , and on the effective μμ Majorana neutrino mass |mμμ|.

Aad, G., Abbott, B., Abeling, K., Abicht, N.J., Abidi, S.H., Aboulhorma, A., et al. (2023). Search for Majorana neutrinos in same-sign WW scattering events from pp collisions at √s = 13 TeV. EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 83(9), 824-1-824-26 [10.1140/epjc/s10052-023-11915-y].

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

Alberghi, G. L.;Alfonsi, F.;Bindi, M.;Boscherini, D.;Carratta, G.;Cavalli, N.;Clissa, L.;De Castro, S.;Fabbri, F.;Fabbri, L.;Franchini, M.;Gabrielli, A.;Massa, L.;Monzani, S.;Polini, A.;Rinaldi, L.;Romano, M.;Sbarra, C.;Sbrizzi, A.;Semprini-Cesari, N.;Sioli, M.;Todome, K.;Valentinetti, S.;Villa, M.;Vittori, C.;Vivarelli, I.;Zoccoli, A.;
2023

Abstract

A search for Majorana neutrinos in same-sign W W 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 samesign W W scattering and W Z 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 |VμN | 2 as a function of the heavy Majorana neutrino’s mass mN , and on the effective μμ Majorana neutrino mass |mμμ|.
2023
Aad, G., Abbott, B., Abeling, K., Abicht, N.J., Abidi, S.H., Aboulhorma, A., et al. (2023). Search for Majorana neutrinos in same-sign WW scattering events from pp collisions at √s = 13 TeV. EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 83(9), 824-1-824-26 [10.1140/epjc/s10052-023-11915-y].
Aad, G.; Abbott, B.; Abeling, K.; Abicht, N. J.; Abidi, S. H.; Aboulhorma, A.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Abusleme Hoffman, A. C.; Achar...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/953925
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