← Back to cohort
Search for an Invisibly Decaying <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>Z</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math> Boson at Belle II in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup><mml:mo stretchy="false">(</mml:mo><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>±</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mo>∓</mml:mo></mml:mrow></mml:msup><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:math> Plus Missing Energy Final States
I. Adachi, P. Ahlburg, H. Aihara, Н. Акопов, A. Aloisio, N. Anh Ky, D. M. Asner, H. Atmacan, T. Aushev, V. Aushev, T. Aziz, V. Babu, S. Baehr, P. Bambade, Sw. Banerjee, V. Bansal, M. Barrett, J. Baudot, Jürgen Becker, P. K. Behera, J. V. Bennett, E. Bernieri, F. U. Bernlochner, M. Bertemes, M. Bessner, S. Bettarini, F. Bianchi, D. Biswas, A. Bożek, M. Bračko, P. Branchini, R. A. Briere, T. E. Browder, A. Budano, L. Burmistrov, S. Bussino, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, D. Červenkov, M.-C. Chang, R. Cheaib, V. Chekelian, Y. Q. Chen, Yi-Yen Chen, K. Chilikin, K. Cho, S. Cho, S.-K. Choi, S. Choudhury, D. Cinabro, L. Corona, L.M. Cremaldi, S. Cunliffe, T. Czank, F. Dattola, E. De La Cruz–Burelo, G. De Nardo, M. De Nuccio, G. De Pietro, R. de Sangro, M. Destefanis, S. Dey, A. De Yta-Hernandez, F. Di Capua, Z. Doležal, I. Domínguez Jiménez, T. V. Dong, K. Dort, D. Dossett, S. Dubey, S. Duell, G. Dujany, S. Eidelman, M. Eliachevitch, J. E. Fast, T. Ferber, D. Ferlewicz, G. Finocchiaro, S. Fiore, A. Fodor, F. Forti, B. G. Fulsom, E. Ganiev, M. Garcia-Hernandez, R. B. Garg, V. Gaur, A. Gaz, A. Gellrich, J. Gemmler, Thomas Geßler, R. Giordano, A. Giri, B. Gobbo, R. Godang, P. Goldenzweig, B. Golob, P. Gomis, W. Gradl, E. Graziani, D. Greenwald, Y. Guan, C. Hadjivasiliou, S. Halder, T. Hara, O. Hartbrich, K. Hayasaka, H. Hayashii, C. Hearty, M. T. Hedges, I. Heredia-De La Cruz, M. Hernández Villanueva, A. D. Hershenhorn, T. Higuchi, E. Hill, M. Hoek, C.-L. Hsu, Y. Hu, T. Iijima, K. Inami, G. Inguglia, J. Irakkathil Jabbar, A. Ishikawa, R. Itoh, M. Iwasaki, W. W. Jacobs, D. E. Jaffe, E.-J. Jang, H. B. Jeon, S. Jia, Y. Jin, C. Joo, K. K. Joo, J. Kahn, H. Kakuno, A. B. Kaliyar, J. Kandra, G. Karyan, Yuji Katō, T. Kawasaki, B. H. Kim, C. H. Kim, D. Y. Kim, Kyoungmin Kim, S. H. Kim, Y. K. Kim, Y. Kim, T. D. Kimmel, H. Kindo, C. Kleinwort, T. Koga, S. Kohani, I. Komarov, S. Korpar, N. Kovalchuk, T. M. G. Kraetzschmar, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, J. Kumar, M. Kumar, R. Kumar, K. Kumara, S. Kurz, A. Kuzmin, Y.-J. Kwon, S. Lacaprara, C. La Licata, L. Lanceri, J. S. Lange, K. Lautenbach, I. S. Lee, S. C. Lee, P. Leitl, D. Levit, L. K. Li, Y. B. Li, J. Libby, K. Lieret, L. Li Gioi, Z. Liptak, Qingyuan Liu, D. Liventsev, S. Longo, T. Luo, Y. Maeda, M. Maggiora, E. Manoni, S. Marcello, C. Mariñas, A. Martini, M. Masuda, T. Matsuda, K. Matsuoka, D. Matvienko, F. Meggendorfer, J. C. Mei, F. Meier, M. Merola, F. Metzner, M. Milesi, C. Miller, K. Miyabayashi, H. Miyake, R. Mizuk, K. Azmi, G. B. Mohanty, T. Moon, T. Morii, H. G. Moser, F. Mueller, F. J. Müller, Th. Müller, G. Muroyama, R. Mussa, E. Nakano, M. Nakao, M. Nayak, D. Neverov, C. Niebuhr, N. K. Nisar, S. Nishida, K. Nishimura, M. Nishimura, B. Oberhof, K. Ogawa, Y. Onishchuk, H. Ono, Y. Onuki, P. Oskin, H. Ozaki, P. Pakhlov, G. Pakhlova, A. Paladino, A. Panta, E. Paoloni, H. Park, B. Paschen, A. Passeri, A. Pathak, S. Paul, T. K. Pedlar, I. M. Peruzzi, R. Peschke, R. Pestotnik, M. Piccolo, L. E. Piilonen, V. Popov, C. Praz, E. Prencipe, M. T. Prim, M. V. Purohit, P. Rados, R. Rasheed, S. Reiter, M. Remnev, P. K. Resmi, I. Ripp-Baudot, M. Ritter, G. Rizzo, L. B. Rizzuto, S. H. Robertson, D. Rodríguez Pérez, J. M. Roney, C. Rosenfeld, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, Y. Sakai, S. Sandilya, A. Sangal, L. Šantelj, P. Sartori, Y. Sato, V. Savinov, B. Scavino, J. Schueler, C. Schwanda, R. M. Seddon, Y. Seino, A. Selce, K. Senyo, C. Sfienti, C. P. Shen, J.-G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, R. J. Sobie, A. Soffer, A. Sokolov, E. Solovieva, S. Spataro, B. Spruck, M. Starič, S. Stefkova, Z. S. Stottler, R. Stroili, J. Strube, M. Sumihama, T. Sumiyoshi, D. J. Summers, S. Suzuki, M. Tabata, M. Takizawa, U. Tamponi, S. Tanaka, K. Tanida, N. Taniguchi, P. Taras, F. Tenchini, E. Torassa, K. Trabelsi, T. Tsuboyama, M. Uchida, K. Unger, Y. Unno, S. Uno, Y. Ushiroda, S. Vahsen, R. van Tonder, G. S. Varner, K. E. Varvell, A. Vinokurova, L. Vitale, A. Vossen, M. Wakai, H. M. Wakeling, W. Wan Abdullah, C. H. Wang, M.-Z. Wang, A. Warburton, M. Watanabe, J. Angus Webb, S. Wehle, C. Wessel, J. Wiechczynski, H. Windel, E. Won, B. Yabsley, S. Yamada, W. B. Yan, S. B. Yang, Haoxiang Ye, J. H. Yin, M. Yonenaga, C. Z. Yuan, Y. Yusa, L. Zani, Z. Zhang, V. Zhilich, Q. Zhou, Xiaopeng Zhou, V. Zhukova
Bibliographic record
VenuePhysical Review Letters · 2020
Typearticle
Languagelv
FieldPhysics and Astronomy
TopicParticle physics theoretical and experimental studies
Canadian institutionsUniversité de MontréalUniversity of VictoriaInstitute of Particle PhysicsMcGill UniversityUniversity of British Columbia
FundersH2020 European Research CouncilAkademi Sains MalaysiaJapan Society for the Promotion of ScienceAustralian Research CouncilNatural Sciences and Engineering Research Council of CanadaInstitut National de Physique Nucléaire et de Physique des ParticulesHorizon 2020 Framework ProgrammeNational Institute of InformaticsMinistry of Science and Higher Education of the Russian FederationKorea Research Environment Open NetworkMinistry of Science,Technology and ResearchBundesministerium für Bildung, Wissenschaft und ForschungMinistry of Education and Science of UkraineMinisterstwo Edukacji i NaukiTürkiye Bilimsel ve Teknolojik Araştırma KurumuJavna Agencija za Raziskovalno Dejavnost RSIsrael Science FoundationNational Research Foundation of KoreaLiaoning Revitalization Talents ProgramBundesministerium für Bildung und ForschungMinisterstvo Školství, Mládeže a TělovýchovyKorea Institute of Science and TechnologyScience and Technology Commission of Shanghai MunicipalityThailand Center of Excellence in PhysicsUnited States-Israel Binational Science FoundationGeneralitat ValencianaNational Research FoundationAustrian Science FundCAS Center for Excellence in Particle PhysicsChinese Academy of SciencesMinistry of Higher Education, MalaysiaU.S. Department of EnergyNational Natural Science Foundation of ChinaKorea Institute of Science and Technology InformationMinistry of Education, Culture, Sports, Science and TechnologyDeutsche ForschungsgemeinschaftIstituto Nazionale di Fisica NucleareMinistry of EducationDepartment of Science and Technology, Ministry of Science and Technology, IndiaNational Science FoundationCompute CanadaCanarieMax-Planck-GesellschaftNational Foundation for Science and Technology DevelopmentCentre National de la Recherche ScientifiqueUniverzita Karlova v PrazeAlexander von Humboldt-Stiftung
KeywordsPrime (order theory)PhysicsParticle physicsLeptonCombinatoricsNuclear physicsMathematicsElectron
Abstract
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}.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
metaresearch head score (Codex)0.001
metaresearch head score (Gemma)0.003
Version: metacan-v3-hybrid-931329e0061cValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Bench or experimental · Consensus signal: none
GenreCandidate signal: Empirical · Consensus signal: none
Teacher disagreement score0.091
Threshold uncertainty score0.304
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.002 | 0.003 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.091 | 0.028 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
Opus teacher head0.025
GPT teacher head0.266
Teacher spread0.241 · how far apart the two teachers sit on this one work
Validation status
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
The models applied no category: nothing in the taxonomy fit this work.
Study designBench or experimental
Domainnot available
GenreEmpirical
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".
Quick stats
Citations46
Published2020
Admission routes2
Has abstractyes