Search for an invisibly decaying $Z^{\prime}$ boson at Belle II in $e^+ e^- \to μ^+ μ^- (e^{\pm} μ^{\mp})$ plus missing energy final states
Creators: name: Belle II Collaboration
name: Adachi, I.
name: Ahlburg, P.
name: Aihara, H.
name: Akopov, N.
name: Aloisio, A.
name: Ky, N. Anh
name: Asner, D. M.
name: Atmacan, H.
name: Aushev, T.
name: Aushev, V.
name: Aziz, T.
name: Babu, V.
name: Baehr, S.
name: Bambade, P.
name: Banerjee, Sw.
name: Bansal, V.
name: Barrett, M.
name: Baudot, J.
name: Becker, J.
name: Behera, P. K.
name: Bennett, J. V.
name: Bernieri, E.
name: Bernlochner, F. U.
name: Bertemes, M.
name: Bessner, M.
name: Bettarini, S.
name: Bianchi, F.
name: Biswas, D.
name: Bozek, A.
name: Bračko, M.
name: Branchini, P.
name: Briere, R. A.
name: Browder, T. E.
name: Budano, A.
name: Burmistrov, L.
name: Bussino, S.
name: Campajola, M.
name: Cao, L.
name: Casarosa, G.
name: Cecchi, C.
name: Červenkov, D.
name: Chang, M. -C.
name: Cheaib, R.
name: Chekelian, V.
name: Chen, Y. Q.
name: Chen, Y. -T.
name: Cheon, B. G.
name: Chilikin, K.
name: Cho, K.
name: Cho, S.
name: Choi, S. -K.
name: Choudhury, S.
name: Cinabro, D.
name: Corona, L.
name: Cremaldi, L. M.
name: Cunliffe, S.
name: Czank, T.
name: Dattola, F.
name: De La Cruz-Burelo, E.
name: De Nardo, G.
name: De Nuccio, M.
name: De Pietro, G.
name: de Sangro, R.
name: Destefanis, M.
name: Dey, S.
name: De Yta-Hernandez, A.
name: Di Capua, F.
name: Doležal, Z.
name: Jiménez, I. Domínguez
name: Dong, T. V.
name: Dort, K.
name: Dossett, D.
name: Dubey, S.
name: Duell, S.
name: Dujany, G.
name: Eidelman, S.
name: Eliachevitch, M.
name: Fast, J. E.
name: Ferber, T.
name: Ferlewicz, D.
name: Finocchiaro, G.
name: Fiore, S.
name: Fodor, A.
name: Forti, F.
name: Fulsom, B. G.
name: Ganiev, E.
name: Garcia-Hernandez, M.
name: Garg, R.
name: Gaur, V.
name: Gaz, A.
name: Gellrich, A.
name: Gemmler, J.
name: Geßler, T.
name: Giordano, R.
name: Giri, A.
name: Gobbo, B.
name: Godang, R.
name: Goldenzweig, P.
name: Golob, B.
name: Gomis, P.
name: Gradl, W.
name: Graziani, E.
name: Greenwald, D.
name: Guan, Y.
name: Hadjivasiliou, C.
name: Halder, S.
name: Hara, T.
name: Hartbrich, O.
name: Hayasaka, K.
name: Hayashii, H.
name: Hearty, C.
name: Hedges, M. T.
name: de la Cruz, I. Heredia
name: Villanueva, M. Hernández
name: Hershenhorn, A.
name: Higuchi, T.
name: Hill, E. C.
name: Hoek, M.
name: Hsu, C. -L.
name: Hu, Y.
name: Iijima, T.
name: Inami, K.
name: Inguglia, G.
name: Jabbar, J. Irakkathil
name: Ishikawa, A.
name: Itoh, R.
name: Iwasaki, Y.
name: Jacobs, W. W.
name: Jaffe, D. E.
name: Jang, E. -J.
name: Jeon, H. B.
name: Jia, S.
name: Jin, Y.
name: Joo, C.
name: Joo, K. K.
name: Kahn, J.
name: Kakuno, H.
name: Kaliyar, A. B.
name: Kandra, J.
name: Karyan, G.
name: Kato, Y.
name: Kawasaki, T.
name: Kim, B. H.
name: Kim, C. -H.
name: Kim, D. Y.
name: Kim, K. -H.
name: Kim, S. -H.
name: Kim, Y. K.
name: Kim, Y.
name: Kimmel, T. D.
name: Kindo, H.
name: Kleinwort, C.
name: Kodyš, P.
name: Koga, T.
name: Kohani, S.
name: Komarov, I.
name: Korpar, S.
name: Kovalchuk, N.
name: Kraetzschmar, T. M. G.
name: Križan, P.
name: Kroeger, R.
name: Krokovny, P.
name: Kuhr, T.
name: Kumar, J.
name: Kumar, M.
name: Kumar, R.
name: Kumara, K.
name: Kurz, S.
name: Kuzmin, A.
name: Kwon, Y. -J.
name: Lacaprara, S.
name: La Licata, C.
name: Lanceri, L.
name: Lange, J. S.
name: Lautenbach, K.
name: Lee, I. -S.
name: Lee, S. C.
name: Leitl, P.
name: Levit, D.
name: Li, L. K.
name: Li, Y. B.
name: Libby, J.
name: Lieret, K.
name: Gioi, L. Li
name: Liptak, Z.
name: Liu, Q. Y.
name: Liventsev, D.
name: Longo, S.
name: Luo, T.
name: Maeda, Y.
name: Maggiora, M.
name: Manoni, E.
name: Marcello, S.
name: Marinas, C.
name: Martini, A.
name: Masuda, M.
name: Matsuda, T.
name: Matsuoka, K.
name: Matvienko, D.
name: Meggendorfer, F.
name: Mei, J. C.
name: Meier, F.
name: Merola, M.
name: Metzner, F.
name: Milesi, M.
name: Miller, C.
name: Miyabayashi, K.
name: Miyake, H.
name: Mizuk, R.
name: Azmi, K.
name: Mohanty, G. B.
name: Moon, T.
name: Morii, T.
name: Moser, H. -G.
name: Mueller, F.
name: Müller, F. J.
name: Muller, Th.
name: Muroyama, G.
name: Mussa, R.
name: Nakano, E.
name: Nakao, M.
name: Nayak, M.
name: Nazaryan, G.
name: Neverov, D.
name: Niebuhr, C.
name: Nisar, N. K.
name: Nishida, S.
name: Nishimura, K.
name: Nishimura, M.
name: Oberhof, B.
name: Ogawa, K.
name: Onishchuk, Y.
name: Ono, H.
name: Onuki, Y.
name: Oskin, P.
name: Ozaki, H.
name: Pakhlov, P.
name: Pakhlova, G.
name: Paladino, A.
name: Panta, A.
name: Paoloni, E.
name: Park, H.
name: Paschen, B.
name: Passeri, A.
name: Pathak, A.
name: Paul, S.
name: Pedlar, T. K.
name: Peruzzi, I.
name: Peschke, R.
name: Pestotnik, R.
name: Piccolo, M.
name: Piilonen, L. E.
name: Popov, V.
name: Praz, C.
name: Prencipe, E.
name: Prim, M. T.
name: Purohit, M. V.
name: Rados, P.
name: Rasheed, R.
name: Reiter, S.
name: Remnev, M.
name: Resmi, P. K.
name: Ripp-Baudot, I.
name: Ritter, M.
name: Rizzo, G.
name: Rizzuto, L. B.
name: Robertson, S. H.
name: Pérez, D. Rodríguez
name: Roney, J. M.
name: Rosenfeld, C.
name: Rostomyan, A.
name: Rout, N.
name: Russo, G.
name: Sahoo, D.
name: Sakai, Y.
name: Sandilya, S.
name: Sangal, A.
name: Santelj, L.
name: Sartori, P.
name: Sato, Y.
name: Savinov, V.
name: Scavino, B.
name: Schueler, J.
name: Schwanda, C.
name: Seddon, R. M.
name: Seino, Y.
name: Selce, A.
name: Senyo, K.
name: Sfienti, C.
name: Shen, C. P.
name: Shiu, J. -G.
name: Shwartz, B.
name: Sibidanov, A.
name: Simon, F.
name: Sobie, R. J.
name: Soffer, A.
name: Sokolov, A.
name: Solovieva, E.
name: Spataro, S.
name: Spruck, B.
name: Starič, M.
name: Stefkova, S.
name: Stottler, Z. S.
name: Stroili, R.
name: Strube, J.
name: Sumihama, M.
name: Sumiyoshi, T.
name: Summers, D. J.
name: Suzuki, S. Y.
name: Tabata, M.
name: Takizawa, M.
name: Tamponi, U.
name: Tanaka, S.
name: Tanida, K.
name: Taniguchi, N.
name: Taras, P.
name: Tenchini, F.
name: Torassa, E.
name: Trabelsi, K.
name: Tsuboyama, T.
name: Uchida, M.
name: Unger, K.
name: Unno, Y.
name: Uno, S.
name: Ushiroda, Y.
name: Vahsen, S. E.
name: van Tonder, R.
name: Varner, G. S.
name: Varvell, K. E.
name: Vinokurova, A.
name: Vitale, L.
name: Vossen, A.
name: Wakai, M.
name: Wakeling, H. M.
name: Abdullah, W. Wan
name: Wang, C. H.
name: Wang, M. -Z.
name: Warburton, A.
name: Watanabe, M.
name: Webb, J.
name: Wehle, S.
name: Wessel, C.
name: Wiechczynski, J.
name: Windel, H.
name: Won, E.
name: Yabsley, B.
name: Yamada, S.
name: Yan, W.
name: Yang, S. B.
name: Ye, H.
name: Yin, J. H.
name: Yonenaga, M.
name: Yuan, C. Z.
name: Yusa, Y.
name: Zani, L.
name: Zhang, Z.
name: Zhilich, V.
name: Zhou, Q. D.
name: Zhou, X. Y.
name: Zhukova, V. I.
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: Theories beyond the standard model often predict the existence of an additional neutral boson, the $Z^{\prime}$. 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 $Z^{\prime}$ in the process $e^+ e^- \to μ^+ μ^- Z^{\prime}$ and of a lepton-flavor-violating $Z^{\prime}$ in $e^+ e^- \to e^{\pm} μ^{\mp} Z^{\prime}$. 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 $Z^{\prime}$ coupling constant at the level of $5 \times 10^{-2}$ -- $1$ $M_{Z^\prime}\leq 6$ GeV/$c^2$.
description: 9 pages, 5 figures + supplemental materials. Accepted for publication in Physical Review Letters