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Aihara, H; Akopov, N; Aloisio, A; Atmacan, H; Aushev, V; Baehr, S; Barrett, M; Behera, P K; Bernieri, E; Bernlochner, F U; Bettarini, S; Bozek, A; Branchini, P; Campajola, M; Casarosa, G; Choi, S-K; Choudhury, S; Cinabro, D; De Nuccio, M; Dort, K; Dujany, G; Fast, J E; Fiore, S; Garg, R; Godang, R; Golob, B; Gomis, P; Gradl, W; Graziani, E; Hara, T; Hartbrich, O; Hayasaka, K; Hayashii, H; Hedges, M T; Higuchi, T; Jacobs, W W; Joo, C; Kahn, J; Kandra, J; Kawasaki, T; Kim, B H; Kim, Y K; Kodyš, P; Kraetzschmar, T M G; Kroeger, R; Kuhr, T; La Licata, C; Leitl, P; Levit, D; Li, L K; Li, Y B; Longo, S; Luo, T; Milesi, M; Morii, T; Muller, Th; Muroyama, G; Nayak, M; Niebuhr, C; Nishimura, K; Ogawa, K; Ono, H; Onuki, Y; Ozaki, H; Panta, A; Park, H; Paschen, B; Passeri, A; Pedlar, T K; Peschke, R; Prencipe, E; Rados, P; Rasheed, R; Ripp-Baudot, I; Rizzo, G; Russo, G; Sangal, A; Santelj, L; Sato, Y; Scavino, B; Schueler, J; Sokolov, A; Spataro, S; Suzuki, S Y; Takizawa, M; Taras, P; Torassa, E; Tsuboyama, T; Uchida, M; Unno, Y; Uno, S; Vahsen, S E; van Tonder, R; Wakai, M; Wakeling, H M; Wang, C H; Yabsley, B; Zhang, Z; Zhou, X Y; Zhukova, V I
Physical review letters, 04/2020, Letnik: 124, Številka: 14Journal Article
Theories beyond the standard model often predict the existence of an additional neutral boson, the Z^{'}. Using data collected by the Belle II experiment during 2018 at the SuperKEKB collider, we perform the first searches for the invisible decay of a Z^{'} in the process e^{+}e^{-}→μ^{+}μ^{-}Z^{'} and of a lepton-flavor-violating Z^{'} in e^{+}e^{-}→e^{±}μ^{∓}Z^{'}. We do not find any excess of events and set 90% credibility level upper limits on the cross sections of these processes. We translate the former, in the framework of an L_{μ}-L_{τ} theory, into upper limits on the Z^{'} coupling constant at the level of 5×10^{-2}-1 for M_{Z^{'}}≤6 GeV/c^{2}.
