Phys.Rev.Lett. 136, 022701 (2026)

H.Acharya, N.Ackermann, M.Agostini, A.Alexander, C.Andreoiu, G.R.Araujo, F.T.Avignone, M.Babicz, W.Bae, A.M.Bakalyarov, M.Balata, A.S.Barabash, P.S.Barbeau, C.J.Barton, L.Baudis, C.Bauer, E.Bernieri, L.Bezrukov, K.H.Bhimani, V.Biancacci, E.Blalock, S.J.Borden, G.Borghi, F.Borra, B.Bos, A.Boston, V.Bothe, R.Bouabid, R.Brugnera, N.Burlac, M.Busch, S.Calgaro, L.Canonica, S.Capra, M.Carminati, R.M.D.Carney, C.Cattadori, R.Cesarano, Y.-D.Chan, J.R.Chapman, A.Chernogorov, P.-J.Chiu, C.D.Christofferson, M.L.Clark, A.I.Colon-Rivera, T.Comellato, V.D'Andrea, R.Deckert, J.A.Detwiler, A.Di Giacinto, N.Di Marco, T.Dixon, K.-M.Dong, A.Drobizhev, G.Duran, Yu.Efremenko, S.R.Elliott, C.H.J.Emmanuel, E.Engelhardt, E.Esch, M.T.Febbraro, F.Ferella, D.E.Fields, C.Fiorini, M.Fomina, N.Fuad, R.Gala, A.Galindo-Uribarri, A.Gangapshev, A.Garfagnini, S.Gazzana, A.Geraci, L.Gessler, C.Ghiano, A.Gieb, S.Giri, M.Gold, C.Gooch, G.Grunauer, M.P.Green, J.Gruszko, I.Guinn, V.E.Guiseppe, V.Gurentsov, Y.Gurov, K.Gusev, B.Hackett, F.Hagemann, M.Haranczyk, F.Henkes, R.Henning, J.Herrera, D.Hervas Aguilar, J.Hinton, R.Hodak, H.F.R.Hoffmann, M.A.Howe, M.Huber, M.Hult, A.Ianni, K.Jedrzejczak, J.Jochum, R.W.L.Jones, D.S.Judson, M.Junker, J.Kaizer, V.Kazalov, M.F.Kidd, T.Kihm, K.Kilgus, A.Klimenko, K.T.Knopfle, I.Kochanek, O.Kochetov, I.Kontul, L.L.Kormos, V.N.Kornoukhov, P.Krause, H.Krishnamoorthy, V.V.Kuzminov, K.Lang, M.Laubenstein, N.N.P.N.Lay, E.Leon, A.Leder, B.Lehnert, A.Leonhardt, N.Levashko, L.Y.Li, A.Li, Y.-R.Lin, M.Lindner, I.Lippi, A.Love, A.Lubashevskiy, B.Lubsandorzhiev, N.Lusardi, C.Macolino, B.Majorovits, F.Mamedov, L.Manzanillas, G.G.Marshall, R.D.Martin, E.L.Martin, R.Massarczyk, A.Mazumdar, G.McDowell, D.-M.Mei, S.P.Meireles, M.Menzel, S.Mertens, E.Miller, I.Mirza, M.Misiaszek, M.Morella, B.Morgan, T.Mroz, D.Muenstermann, C.J.Nave, I.Nemchenok, M.Neuberger, N.O'Briant, F.Paissan, L.Papp, L.S.Paudel, K.Pelczar, L.Pertoldi, W.Pettus, F.Piastra, M.Pichotta, P.Piseri, A.W.P.Poon, P.P.Povinec, M.Pruckner, A.Pullia, W.S.Quinn, D.C.Radford, Y.A.Ramachers, A.Razeto, M.Redchuk, A.L.Reine, S.Riboldi, K.Rielage, C.Romo-Luque, N.Rossi, S.Rozov, T.J.Ruland, N.Rumyantseva, J.Runge, R.Saakyan, S.Sailer, G.Salamanna, F.Salamida, G.Saleh, V.Sandukovsky, C.Savarese, S.Schonert, A.-K.Schutz, D.C.Schaper, L.Schluter, S.J.Schleich, O.Schulz, M.Schwarz, B.Schwingenheuer, C.Seibt, O.Selivanenko, G.Senatore, A.Serafini, K.Shakhov, E.Shevchik, M.Shirchenko, Y.Shitov, H.Simgen, F.Simkovic, S.Simonaitis-Boyd, M.Skorokhvatov, M.Slavickova, A.Smolnikov, J.A.Solomon, G.Song, A.C.Sousa, A.R.Sreekala, L.Steinhart, I.Stekl, T.Sterr, M.Stommel, S.A.Sullivan, R.R.Sumathi, K.Szczepaniec, L.Taffarello, D.Tagnani, D.J.Tedeschi, T.N.Thorpe, V.Tretyak, M.Turqueti, E.E.Van Nieuwenhuizen, L.J.Varriano, S.Vasilyev, A.Veresnikova, C.Vignoli, C.Vogl, K.von Sturm, A.Warren, D.Waters, S.L.Watkins, C.Wiesinger, J.F.Wilkerson, M.Willers, C.Wiseman, M.Wojcik, D.Xu, W.Xu, E.Yakushev, T.Ye, C.-H.Yu, V.Yumatov, D.Zinatulina, K.Zuber, G.Zuzel, for the LEGEND Collaboration

First Results on the Search for Lepton Number Violating Neutrinoless Double-β Decay with the LEGEND-200 Experiment

RADIOACTIVITY ⁷⁶Ge(2β^-); measured decay products, Eβ, Iβ, Eγ, Iγ; deduced limits on neutrinoless T_1/2, Majorana neutrinos mass. Building onkey technological innovations from the GERmanium Detector Array (GERDA) experiment and the MAJORANA DEMONSTRATOR experiment, LEGEND-200 Collaboration.

doi: 10.1103/25tk-nctn