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Adachi, I; Aloisio, A; Aushev, V; Banerjee, Sw; Bhuyan, B; Bodrov, D; Bozek, A; Chang, M-C; Chang, P; Cheaib, R; Chirapatpimol, K; Dattola, F; De La Motte, S A; De Nuccio, M; de Sangro, R; Destefanis, M; Dorigo, M; Dreyer, S; Eliachevitch, M; Finck, C; Fulsom, B G; Ganiev, E; Glazov, A; Granderath, S; Gudkova, K; Haigh, H; Hazra, S; Iijima, T; Itoh, R; Ji, Q P; Jia, S; Junkerkalefeld, H; Kaliyar, A B; Karl, R; Kindo, H; Kojima, K; Korobov, A; Kovalenko, E; Kowalewski, R; Kraetzschmar, T M G; Kumara, K; Lacaprara, S; Le Diberder, F R; Li, C; Li, L K; Libby, J; Lieret, K; Longo, S; Lueck, T; Maiti, R; Marinas, C; Martel, L; Massaccesi, L; Merola, M; Naruki, M; Nayak, L; Pakhlov, P; Panta, A; Passeri, A; Piilonen, L E; Podobnik, T; Praz, C; Prell, S; Prencipe, E; Raeuber, G; Raiz, S; Reiter, S; Remnev, M; Ripp-Baudot, I; Rizzo, G; Robertson, S H; Rostomyan, A; Sangal, A; Sato, Y; Seino, Y; Sevior, M E; Sfienti, C; Shillington, T; Shiu, J-G; Sibidanov, A; Singh, J B; Stefkova, S; Stottler, Z S; Sue, Y; Sumihama, M; Takizawa, M; Tenchini, F; Toutounji, N; Trabelsi, K; Uchida, M; Unno, Y; Uno, K; Uno, S; Vahsen, S E; Vinokurova, A; Wakeling, H M; Wang, M-Z; Yamada, S; Ye, H; Zhilich, V
Physical review letters, 06/2023, Letnik: 130, Številka: 23Journal Article
The L_{μ}-L_{τ} extension of the standard model predicts the existence of a lepton-flavor-universality-violating Z^{'} boson that couples only to the heavier lepton families. We search for such a Z^{'} through its invisible decay in the process e^{+}e^{-}→μ^{+}μ^{-}Z^{'}. We use a sample of electron-positron collisions at a center-of-mass energy of 10.58 GeV collected by the Belle II experiment in 2019-2020, corresponding to an integrated luminosity of 79.7 fb^{-1}. We find no excess over the expected standard-model background. We set 90%-confidence-level upper limits on the cross section for this process as well as on the coupling of the model, which ranges from 3×10^{-3} at low Z^{'} masses to 1 at Z^{'} masses of 8 GeV/c^{2}.
