Search for an Invisible Z^{'} in a Final State with Two Muons and Missing Energy at Belle II. I Adachi , K Adamczyk , L Aggarwal , H Ahmed , H Aihara , N Akopov , A Aloisio , N Anh Ky , D M Asner , T Aushev , V Aushev , H Bae , S Bahinipati , P Bambade , Sw Banerjee , J Baudot , M Bauer , A Baur , A Beaubien , J Becker , P K Behera , J V Bennett , E Bernieri , F U Bernlochner , V Bertacchi , M Bertemes , E Bertholet , M Bessner , S Bettarini , B Bhuyan , F Bianchi , T Bilka , D Biswas , D Bodrov , A Bolz , J Borah , A Bozek , M Bračko , P Branchini , T E Browder , A Budano , S Bussino , M Campajola , L Cao , G Casarosa , C Cecchi , M-C Chang , P Chang , R Cheaib , P Cheema , V Chekelian , C Chen , Y Q Chen , B G Cheon , K Chilikin , K Chirapatpimol , H-E Cho , K Cho , S-J Cho , S-K Choi , S Choudhury , D Cinabro , L Corona , S Cunliffe , S Das , F Dattola , E De La Cruz-Burelo , S A De La Motte , G De Nardo , M De Nuccio , G De Pietro , R de Sangro , M Destefanis , S Dey , A De Yta-Hernandez , R Dhamija , A Di Canto , F Di Capua , J Dingfelder , Z Doležal , I Domínguez Jiménez , T V Dong , M Dorigo , K Dort , D Dossett , S Dreyer , S Dubey , G Dujany , P Ecker , M Eliachevitch , D Epifanov , P Feichtinger , T Ferber , D Ferlewicz , T Fillinger , C Finck , G Finocchiaro , A Fodor , F Forti , B G Fulsom , E Ganiev , M Garcia-Hernandez , V Gaur , A Gaz , A Gellrich , G Ghevondyan , R Giordano , A Giri , A Glazov , B Gobbo , R Godang , P Goldenzweig , S Granderath , E Graziani , D Greenwald , Z Gruberová , T Gu , K Gudkova , J Guilliams , H Haigh , T Hara , K Hayasaka , H Hayashii , S Hazra , C Hearty , I Heredia de la Cruz , M Hernández Villanueva , A Hershenhorn , T Higuchi , E C Hill , M Hohmann , C-L Hsu , T Iijima , K Inami , G Inguglia , N Ipsita , A Ishikawa , S Ito , R Itoh , M Iwasaki , P Jackson , W W Jacobs , D E Jaffe , E-J Jang , Q P Ji , S Jia , Y Jin , K K Joo , H Junkerkalefeld , H Kakuno , A B Kaliyar , K H Kang , S Kang , R Karl , G Karyan , C Kiesling , C-H Kim , D Y Kim , K-H Kim , Y-K Kim , H Kindo , K Kinoshita , P Kodyš , T Koga , S Kohani , K Kojima , T Konno , A Korobov , S Korpar , E Kovalenko , R Kowalewski , T M G Kraetzschmar , P Križan , P Krokovny , T Kuhr , J Kumar , K Kumara , T Kunigo , A Kuzmin , Y-J Kwon , S Lacaprara , T Lam , L Lanceri , J S Lange , M Laurenza , K Lautenbach , R Leboucher , F R Le Diberder , P Leitl , C Li , L K Li , J Libby , K Lieret , Z Liptak , Q Y Liu , D Liventsev , S Longo , A Lozar , T Lueck , T Luo , C Lyu , M Maggiora , R Maiti , S Maity , R Manfredi , E Manoni , S Marcello , C Marinas , L Martel , A Martini , T Martinov , L Massaccesi , M Masuda , K Matsuoka , D Matvienko , S K Maurya , J A McKenna , F Meier , M Merola , F Metzner , M Milesi , C Miller , K Miyabayashi , R Mizuk , G B Mohanty , N Molina-Gonzalez , S Moneta , H-G Moser , M Mrvar , R Mussa , I Nakamura , K R Nakamura , M Nakao , H Nakayama , Y Nakazawa , A Narimani Charan , M Naruki , Z Natkaniec , A Natochii , L Nayak , M Nayak , G Nazaryan , N K Nisar , S Nishida , S Ogawa , H Ono , Y Onuki , P Oskin , P Pakhlov , G Pakhlova , A Paladino , A Panta , E Paoloni , S Pardi , K Parham , H Park , S-H Park , B Paschen , A Passeri , S Patra , S Paul , T K Pedlar , I Peruzzi , R Peschke , R Pestotnik , M Piccolo , L E Piilonen , G Pinna Angioni , P L M Podesta-Lerma , T Podobnik , S Pokharel , L Polat , C Praz , S Prell , E Prencipe , M T Prim , H Purwar , N Rad , P Rados , G Raeuber , S Raiz , A Ramirez Morales , M Reif , S Reiter , M Remnev , I Ripp-Baudot , G Rizzo , S H Robertson , D Rodríguez Pérez , J M Roney , A Rostomyan , N Rout , G Russo , D A Sanders , S Sandilya , A Sangal , L Santelj , Y Sato , V Savinov , B Scavino , J Schueler , C Schwanda , Y Seino , A Selce , K Senyo , J Serrano , M E Sevior , C Sfienti , C P Shen , T Shillington , J-G Shiu , A Sibidanov , F Simon , J B Singh , J Skorupa , R J Sobie , A Soffer , A Sokolov , E Solovieva , S Spataro , B Spruck , M Starič , S Stefkova , Z S Stottler , R Stroili , J Strube , Y Sue , M Sumihama , K Sumisawa , W Sutcliffe , S Y Suzuki , H Svidras , M Takizawa , U Tamponi , K Tanida , H Tanigawa , N Taniguchi , F Tenchini , A Thaller , R Tiwary , D Tonelli , E Torassa , N Toutounji , K Trabelsi , M Uchida , I Ueda , Y Uematsu , T Uglov , K Unger , Y Unno , K Uno , S Uno , Y Ushiroda , S E Vahsen , R van Tonder , K E Varvell , A Vinokurova , L Vitale , V Vobbilisetti , H M Wakeling , E Wang , M-Z Wang , X L Wang , A Warburton , M Watanabe , S Watanuki , M Welsch , C Wessel , X P Xu , B D Yabsley , S Yamada , W Yan , S B Yang , H Ye , J H Yin , Y M Yook , K Yoshihara , C Z Yuan , Y Yusa , L Zani , Y Zhang , V Zhilich , Q D Zhou , X Y Zhou , V I Zhukova , R Žlebčík arxiv（2023）
摘要
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}.
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