Home > Publications database > A search for feebly-interacting particles in $B$ decays with missing energy at Belle > print

001     643593
005     20260116212311.0
024 7 _ |a Belle-II:2026tyb
|2 INSPIRETeX
024 7 _ |a inspire:3103099
|2 inspire
024 7 _ |a arXiv:2601.07104
|2 arXiv
024 7 _ |a 10.3204/PUBDB-2026-00304
|2 datacite_doi
037 _ _ |a PUBDB-2026-00304
041 _ _ |a English
088 _ _ |a arXiv:2601.07104
|2 arXiv
088 _ _ |a Belle II Preprint: 2025-029 KEK Preprint: 2025-36
|2 BELLE
100 1 _ |a Abumusabh, M.
|b 0
245 _ _ |a A search for feebly-interacting particles in $B$ decays with missing energy at Belle
260 _ _ |c 2026
336 7 _ |a Preprint
|b preprint
|m preprint
|0 PUB:(DE-HGF)25
|s 1768562975_336664
|2 PUB:(DE-HGF)
336 7 _ |a WORKING_PAPER
|2 ORCID
336 7 _ |a Electronic Article
|0 28
|2 EndNote
336 7 _ |a preprint
|2 DRIVER
336 7 _ |a ARTICLE
|2 BibTeX
336 7 _ |a Output Types/Working Paper
|2 DataCite
500 _ _ |a 11 pages, 6 figures. Supplemental material included
520 _ _ |a We present a search for an invisible hidden-sector particle $ X_{\rm{inv}}$, produced in $B^0 \to \bar{D}^0 X_{\rm{inv}}$ and $B^\pm\to h X_{\rm{inv}}$ decays, where $h = π^\pm$, $K^\pm$, $D_{s}^\pm$, $p^\pm$. The search is performed using $e^+ e^-$ collision data recorded with the Belle detector, corresponding to 711~fb$^{-1}$. No significant signal is observed. We set 90% confidence level upper limits ranging between $10^{-4}$ and $10^{-6}$ on the branching fraction $\mathcal{B}(B \to h X_{\rm{inv}})$ as a function of $m_{ X_{\rm{inv}}}$. Corresponding limits are set on $\mathcal{B}(B \to hX)\times\mathcal{B}(X\toγγ)$ for lifetimes $cτ_X$ between $10~μ$m and 10 m. Many of these limits are the first direct constraints on their respective decays. Our results provide the most stringent exclusion limits to date on the branching fractions for all search channels, and exclude previously unexplored regions of parameter space relevant to several new physics models.
536 _ _ |a 611 - Fundamental Particles and Forces (POF4-611)
|0 G:(DE-HGF)POF4-611
|c POF4-611
|f POF IV
|x 0
536 _ _ |a FAIME - Flavour Anomalies with advanced particle Identification MEthods (884719)
|0 G:(EU-Grant)884719
|c 884719
|f ERC-2019-ADG
|x 1
536 _ _ |a InterLeptons - A search for new interactions at Belle II using leptons (947006)
|0 G:(EU-Grant)947006
|c 947006
|f ERC-2020-STG
|x 2
588 _ _ |a Dataset connected to INSPIRE
693 _ _ |a KEK
|e KEK: BELLE I/II
|1 EXP:(DE-H253)KEK-20150101
|0 EXP:(DE-H253)BELLE-20150101
|5 EXP:(DE-H253)BELLE-20150101
|x 0
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700 1 _ |a Zhou, Q. D.
|b 403
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