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Arguin, J-F; Azuelos, G.; Bakalis, C.; Balz, J.; Bashta, I.; Beck, H. P.; Benjamin, D. P.; Biglietti, M.; Bjørke, K.; Borgna, L. S.; Bortoletto, D.; Bouquet, R.; Burdin, S.; Catmore, J. R.; Chen, S.; Cheung, K.; Chu, M. C.; Cieri, D.; Clark, P. J.; Dabrowski, W.; D’Amico, V.; de Jong, P.; Derendarz, D.; Di Bello, F. A.; Díez Cornell, S.; Dinu, I-M; Dülsen, C.; Dziedzic, B. S.; Ene, I.; Evans, H.; Forland, B. C.; Formica, A.; Freeman, P. M.; Gibson, S. M.; Gingrich, D. M.; Gwenlan, C.; Haley, J.; Herrmann, T.; Hong, Y.; Kado, M.; Karentzos, E.; Kersten, S.; Krüger, H.; Lai, S.; Lange, J. C.; Leonidopoulos, C.; Linck, R. A.; Majewski, S.; Mankad, D. C.; Marjanovic, M.; Martinez, M.; McKay, M. A.; Morvaj, L.; Nagano, K.; Nishu, N.; Ould-Saada, F.; Ozcan, V. E.; Parker, A. J.; Pedersen, M.; Petrukhin, A.; Polini, A.; Pozo Astigarraga, M. E.; Reynolds, E.; Robles Gajardo, C. M.; Rocchi, A.; Rousso, D.; Rüttinger, E. M.; Sánchez, J.; Sanchez Pineda, A.; Schmieden, K.; Sekhniaidze, G.; Silverstein, S. B.; Slawinska, M.; Smirnov, Y.; Stanitzki, M. M.; Stärz, S.; Stelzer-Chilton, O.; Stockton, M. C.; Stugu, B.; Sultanaliyeva, L.; Todt, S.; Trzebinski, M.; Tsulaia, V.; Uchida, K.; Vannoli, L.; Vessella, M.; Vranjes, N.; Wang, P.; Wang, R. -J.; Wang, W. T.; Wittgen, M.; Xu, R.; Xu, Z.; Yan, Z.; Zanzi, D.; Zenin, O.; Zhao, T.; Zhu, H. L.; Zieminska, D.; Zinsser, J.
Physical review letters, 08/2023, Letnik: 131, Številka: 6Journal Article
A search for a long-lived, heavy neutral lepton ($\mathscr{N}$) in 139 fb-1 of s=13TeV pp collision data collected by the ATLAS detector at the Large Hadron Collider is reported. The $\mathscr{N}$ is produced via W → $\mathscr{N}$ μ or W → $\mathscr{N}$e and decays into two charged leptons and a neutrino, forming a displaced vertex. The $\mathscr{N}$ mass is used to discriminate between signal and background. No signal is observed, and limits are set on the squared mixing parameters of the $\mathscr{N}$ with the left-handed neutrino states for the $\mathscr{N}$ mass range 3 GeV < $m$ $\mathscr{N}$ < 15 GeV. For the first time, limits are given for both single-flavor and multiflavor mixing scenarios motivated by neutrino flavor oscillation results for both the normal and inverted neutrino-mass hierarchies.
