在 Belle II 实验中，在具有两个缪子和缺失能量的末态中寻找一种不可见的 Z′ 粒子。

Search for an Invisible Z^{'} in a Final State with Two Muons and Missing Energy at Belle II.

作者信息

Adachi I, Adamczyk K, Aggarwal L, Ahmed H, Aihara H, Akopov N, Aloisio A, Anh Ky N, Asner D M, Aushev T, Aushev V, Bae H, Bahinipati S, Bambade P, Banerjee Sw, Baudot J, Bauer M, Baur A, Beaubien A, Becker J, Behera P K, Bennett J V, Bernieri E, Bernlochner F U, Bertacchi V, Bertemes M, Bertholet E, Bessner M, Bettarini S, Bhuyan B, Bianchi F, Bilka T, Biswas D, Bodrov D, Bolz A, Borah J, Bozek A, Bračko M, Branchini P, Browder T E, Budano A, Bussino S, Campajola M, Cao L, Casarosa G, Cecchi C, Chang M-C, Chang P, Cheaib R, Cheema P, Chekelian V, Chen C, Chen Y Q, Cheon B G, Chilikin K, Chirapatpimol K, Cho H-E, Cho K, Cho S-J, Choi S-K, Choudhury S, Cinabro D, Corona L, Cunliffe S, Das S, Dattola F, De La Cruz-Burelo E, De La Motte S A, De Nardo G, De Nuccio M, De Pietro G, de Sangro R, Destefanis M, Dey S, De Yta-Hernandez A, Dhamija R, Di Canto A, Di Capua F, Dingfelder J, Doležal Z, Domínguez Jiménez I, Dong T V, Dorigo M, Dort K, Dossett D, Dreyer S, Dubey S, Dujany G, Ecker P, Eliachevitch M, Epifanov D, Feichtinger P, Ferber T, Ferlewicz D, Fillinger T, Finck C, Finocchiaro G, Fodor A, Forti F, Fulsom B G, Ganiev E, Garcia-Hernandez M, Gaur V, Gaz A, Gellrich A, Ghevondyan G, Giordano R, Giri A, Glazov A, Gobbo B, Godang R, Goldenzweig P, Granderath S, Graziani E, Greenwald D, Gruberová Z, Gu T, Gudkova K, Guilliams J, Haigh H, Hara T, Hayasaka K, Hayashii H, Hazra S, Hearty C, Heredia de la Cruz I, Hernández Villanueva M, Hershenhorn A, Higuchi T, Hill E C, Hohmann M, Hsu C-L, Iijima T, Inami K, Inguglia G, Ipsita N, Ishikawa A, Ito S, Itoh R, Iwasaki M, Jackson P, Jacobs W W, Jaffe D E, Jang E-J, Ji Q P, Jia S, Jin Y, Joo K K, Junkerkalefeld H, Kakuno H, Kaliyar A B, Kang K H, Kang S, Karl R, Karyan G, Kiesling C, Kim C-H, Kim D Y, Kim K-H, Kim Y-K, Kindo H, Kinoshita K, Kodyš P, Koga T, Kohani S, Kojima K, Konno T, Korobov A, Korpar S, Kovalenko E, Kowalewski R, Kraetzschmar T M G, Križan P, Krokovny P, Kuhr T, Kumar J, Kumara K, Kunigo T, Kuzmin A, Kwon Y-J, Lacaprara S, Lam T, Lanceri L, Lange J S, Laurenza M, Lautenbach K, Leboucher R, Le Diberder F R, Leitl P, Li C, Li L K, Libby J, Lieret K, Liptak Z, Liu Q Y, Liventsev D, Longo S, Lozar A, Lueck T, Luo T, Lyu C, Maggiora M, Maiti R, Maity S, Manfredi R, Manoni E, Marcello S, Marinas C, Martel L, Martini A, Martinov T, Massaccesi L, Masuda M, Matsuoka K, Matvienko D, Maurya S K, McKenna J A, Meier F, Merola M, Metzner F, Milesi M, Miller C, Miyabayashi K, Mizuk R, Mohanty G B, Molina-Gonzalez N, Moneta S, Moser H-G, Mrvar M, Mussa R, Nakamura I, Nakamura K R, Nakao M, Nakayama H, Nakazawa Y, Narimani Charan A, Naruki M, Natkaniec Z, Natochii A, Nayak L, Nayak M, Nazaryan G, Nisar N K, Nishida S, Ogawa S, Ono H, Onuki Y, Oskin P, Pakhlov P, Pakhlova G, Paladino A, Panta A, Paoloni E, Pardi S, Parham K, Park H, Park S-H, Paschen B, Passeri A, Patra S, Paul S, Pedlar T K, Peruzzi I, Peschke R, Pestotnik R, Piccolo M, Piilonen L E, Pinna Angioni G, Podesta-Lerma P L M, Podobnik T, Pokharel S, Polat L, Praz C, Prell S, Prencipe E, Prim M T, Purwar H, Rad N, Rados P, Raeuber G, Raiz S, Ramirez Morales A, Reif M, Reiter S, Remnev M, Ripp-Baudot I, Rizzo G, Robertson S H, Rodríguez Pérez D, Roney J M, Rostomyan A, Rout N, Russo G, Sanders D A, Sandilya S, Sangal A, Santelj L, Sato Y, Savinov V, Scavino B, Schueler J, Schwanda C, Seino Y, Selce A, Senyo K, Serrano J, Sevior M E, Sfienti C, Shen C P, Shillington T, Shiu J-G, Sibidanov A, Simon F, Singh J B, Skorupa J, Sobie R J, Soffer A, Sokolov A, Solovieva E, Spataro S, Spruck B, Starič M, Stefkova S, Stottler Z S, Stroili R, Strube J, Sue Y, Sumihama M, Sumisawa K, Sutcliffe W, Suzuki S Y, Svidras H, Takizawa M, Tamponi U, Tanida K, Tanigawa H, Taniguchi N, Tenchini F, Thaller A, Tiwary R, Tonelli D, Torassa E, Toutounji N, Trabelsi K, Uchida M, Ueda I, Uematsu Y, Uglov T, Unger K, Unno Y, Uno K, Uno S, Ushiroda Y, Vahsen S E, van Tonder R, Varvell K E, Vinokurova A, Vitale L, Vobbilisetti V, Wakeling H M, Wang E, Wang M-Z, Wang X L, Warburton A, Watanabe M, Watanuki S, Welsch M, Wessel C, Xu X P, Yabsley B D, Yamada S, Yan W, Yang S B, Ye H, Yin J H, Yook Y M, Yoshihara K, Yuan C Z, Yusa Y, Zani L, Zhang Y, Zhilich V, Zhou Q D, Zhou X Y, Zhukova V I, Žlebčík R

出版信息

Phys Rev Lett. 2023 Jun 9;130(23):231801. doi: 10.1103/PhysRevLett.130.231801.

DOI:10.1103/PhysRevLett.130.231801

PMID:37354391

Abstract

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}.

摘要

标准模型的(L_{μ}-L_{τ})扩展预测存在一种仅与较重轻子家族耦合的违反轻子味普适性的(Z^{'})玻色子。我们通过其在(e^{+}e^{-}→μ^{+}μ^{-}Z^{'})过程中的不可见衰变来寻找这样的(Z^{'})。我们使用了 Belle II 实验在 2019 - 2020 年收集的质心能量为 10.58 GeV 的电子 - 正电子碰撞样本，对应积分亮度为 79.7 fb^{-1}。我们未发现超过预期标准模型背景的信号。我们为此过程的截面以及模型耦合设定了 90%置信水平的上限，该上限在低(Z^{'})质量时为(3×10^{-3})，在(Z^{'})质量为 8 GeV/c^{2}时为 1。