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Search for $$ {K}_S^0 $$ invisible decays
M. Ablikim, M. N. Achasov, P. Adlarson, O. Afedulidis, X. C. Ai, R. Aliberti, A. Amoroso, Qi An, O. Bakina, I. Balossino, Y. Ban, H. -R. Bao, V. Batozskaya, K. Begzsuren, N. Berger, M. Berlowski, M. Bertani, D. Bettoni, F. Bianchi, Elena Del Bianco, A. Bortone, I. Boyko, R. A. Briere, Angela B. Brueggemann, H. Cai, X. Cai, A. Calcaterra, G. F. Cao, N. Cao, S. A. Cetin, X. Y. Chai, J. F. Chang, K. R. Guruprasad, Y. Z., G. Chelkov, C. Chen, C. Chen, Chao Chen, G. Chen, H. S. Chen, H. Y. Chen, M. L. Chen, S. J. Chen, S. L. Chen, S. M. Chen, T. Chen, X. R. Chen, X. T. Chen, Y. B. Chen, Y. Q. Chen, Z. J. Chen, S.-K. Choi, G. Cibinetto, F. Cossio, J. J. Cui, J. P. Dai, A. Dbeyssi, R. E. de Boer, D. Dedovich, C. Q. Deng, Z. Y. Deng, A. Denig, I. Denysenko, M. Destefanis, F. De Mori, B. Ding, X. X. Ding, Y. Ding, Y. Ding, J. Dong, L. Y. Dong, M. Y. Dong, Xiang-Kun Dong, M. C. Du, S. X. Du, Y. Y. Duan, Z. H. Duan, P. Egorov, Gaofeng Fan, J. J. Fan, Y. H. Fan, J. H. Fang, S. S. Fang, W. X. 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Zhou, Jianying Zhou, S. Zhou, X. Y. Zhou, X. K. Zhou, X. R. Zhou, X. Y. Zhou, Y. Z. Zhou, Z. C. Zhou, A. N. Zhu, Jiang Zhu, K. Zhu, Kai Zhu, K. S. Zhu, Lixing Zhu, Lijie Zhu, S. H. Zhu, T. J. Zhu, Weidong Zhu, W. J. Zhu, Weiwei Zhu, Z. A. Zhu, J. H. Zou, J. Zu
Bibliographic record
VenueJournal of High Energy Physics · 2025
Typearticle
Languageen
FieldPhysics and Astronomy
TopicParticle physics theoretical and experimental studies
Canadian institutionsInstitute of Particle Physics
FundersInstitute of High Energy PhysicsState Key Laboratory of Particle Detection and ElectronicsUniversity of Science and Technology of ChinaUniversity of South ChinaSouth China Normal UniversitySoutheast UniversityNanjing UniversityLiaoning UniversityYunnan UniversityWuhan UniversityUniversity of Chinese Academy of SciencesShanxi Normal UniversityZhejiang UniversityUppsala UniversitetNational Research FoundationPeking UniversityUniversità degli Studi del Piemonte OrientaleNankai UniversityShanghai Jiao Tong UniversityZhengzhou UniversitySuranaree University of TechnologyRenmin University of ChinaDeutsche ForschungsgemeinschaftChinese Academy of SciencesTsinghua UniversityUniversity of BristolShanghai Key Laboratory for Particle Physics and CosmologyKnut och Alice Wallenbergs StiftelseCAS Center for Excellence in Particle PhysicsRijksuniversiteit GroningenUniversity of JinanNational Natural Science Foundation of ChinaNational Research Foundation of KoreaYantai UniversityUniversity of the PunjabSun Yat-sen UniversityIstituto Nazionale di Fisica NucleareSoochow UniversityUniversità degli Studi di TorinoVetenskapsrådetShandong UniversityU.S. Department of EnergySwedish Foundation for International Cooperation in Research and Higher EducationStrongShanxi UniversityUniversity of OxfordQufu Normal UniversitySichuan UniversityNanjing Normal University
KeywordsPhysicsParticle physicsPhysics beyond the Standard ModelTheoretical physicsNuclear physics
Abstract
A bstract Based on (1 . 0087 ± 0 . 0044) × 10 10 J/ψ events collected with the BESIII detector at the BEPCII e + e − storage ring, we search for $$ {K}_S^0 $$ K S 0 invisible decays via the J/ψ → $$ \phi {K}_S^0{K}_S^0 $$ ϕ K S 0 K S 0 process. No significant signal is observed, and the upper limit of the branching fraction of these invisible decays is set at 8.4 × 10 − 4 at the 90% confidence level. This is the first experimental search for $$ {K}_S^0 $$ K S 0 invisible decays.
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)0.001
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: Bench or experimental
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.016
Threshold uncertainty score0.055
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.016 | 0.002 |
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 head0.014
GPT teacher head0.285
Teacher spread0.271 · 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".
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Citations2
Published2025
Admission routes1
Has abstractyes