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@ARTICLE{Abumusabh:643593,
author = {Abumusabh, M. and Adachi, I. and Aggarwal, L. and Ahmed, H.
and Ahn, Y. and Aihara, H. and Akopov, N. and Alghamdi, S.
and Alhakami, M. and Aloisio, A. and Althubiti, N. and Amos,
K. and Anh Ky, N. and Antonioli, C. and Asner, D. M. and
Atmacan, H. and Aushev, T. and Ayad, R. and Babu, V. and
Bae, H. and Baghel, N. K. and Bahinipati, S. and Bambade, P.
and Banerjee, Sw. and Barrett, M. and Bartl, M. and Baudot,
J. and Beaubien, A. and Becherer, F. and Becker, J. and
Bennett, J. V. and Bernlochner, F. U. and Bertacchi, V. and
Bertemes, M. and Bertholet, E. and Bessner, M. and
Bettarini, S. and Bhardwaj, V. and Bianchi, F. and Bilka, T.
and Biswas, D. and Bobrov, A. and Bodrov, D. and Bondar, A.
and Bonvicini, G. and Borah, J. and Boschetti, A. and Bozek,
A. and Bračko, M. and Branchini, P. and Brenny, N. and
Browder, T. E. and Budano, A. and Bussino, S. and Campagna,
Q. and Campajola, M. and Cao, L. and Casarosa, G. and
Cecchi, C. and Chang, P. and Cheema, P. and Chen, C. and
Chen, L. and Cheon, B. G. and Cheshta, C. and Chetri, H. and
Chilikin, K. and Chin, J. and Chirapatpimol, K. and Cho,
H.-E. and Cho, K. and Cho, S.-J. and Choi, S.-K. and
Choudhury, S. and Chutia, S. and Cochran, J. and
Colorado-Caicedo, J. A. and Consigny, I. and Corona, L. and
Cui, J. X. and De La Cruz-Burelo, E. and De La Motte, S. A.
and de Marino, G. and De Nardo, G. and De Pietro, G. and de
Sangro, R. and Destefanis, M. and Dey, S. and Dhayal, R. and
Dingfelder, J. and Doležal, Z. and Domínguez Jiménez, I.
and Dong, T. V. and Dong, X. and Dujany, G. and Ecker, P.
and Epifanov, D. and Farkas, R. and Feichtinger, P. and
Ferber, T. and Fillinger, T. and Finck, C. and Finocchiaro,
G. and Forti, F. and Fulsom, B. G. and Gabrielli, A. and
Gale, A. and Ganiev, E. and Garcia-Hernandez, M. and Garg,
R. and Gärtner, L. and Gaudino, G. and Gaur, V. and Gautam,
V. and Gellrich, A. and Ghevondyan, G. and Ghosh, D. and
Ghumaryan, H. and Giakoustidis, G. and Giordano, R. and
Giri, A. and Gironella Gironell, P. and Glazov, A. and
Gobbo, B. and Godang, R. and Gogota, O. and Goldenzweig, P.
and Graziani, E. and Greenwald, D. and Gudkova, K. and
Haide, I. and Han, Y. and Hayashii, H. and Hazra, S. and
Hearty, C. and Hedges, M. T. and Heidelbach, A. and Heine,
G. and de la Cruz, I. Heredia and Hernández Villanueva, M.
and Higuchi, T. and Hoek, M. and Hohmann, M. and Hoppe, R.
and Horak, P. and Hou, X. T. and Hsu, C.-L. and Humair, T.
and Iijima, T. and Inguglia, G. and Ipsita, N. and Ishikawa,
A. and Itoh, R. and Iwasaki, M. and Jackson, P. and Jacobs,
W. W. and Jang, E.-J. and Ji, Q. P. and Jia, S. and Jin, Y.
and Johnson, A. and Kaliyar, A. B. and Kandra, J. and Kang,
K. H. and Kang, S. and Karyan, G. and Keil, F. and Ketter,
C. and Kiesling, C. and Kim, D. Y. and Kim, J.-Y. and Kim,
K.-H. and Kindo, H. and Kinoshita, K. and Kodyš, P. and
Koga, T. and Kohani, S. and Kojima, K. and Korobov, A. and
Korpar, S. and Kovalenko, E. and Kowalewski, R. and Križan,
P. and Krokovny, P. and Kuhr, T. and Kumar, D. and Kumara,
K. and Kunigo, T. and Kuzmin, A. and Kwon, Y.-J. and
Lacaprara, S. and Lam, T. and Lange, J. S. and Lau, T. S.
and Laurenza, M. and Leboucher, R. and Le Diberder, F. R.
and Lee, H. and Lee, M. J. and Lemettais, C. and Leo, P. and
Lewis, P. M. and Li, C. and Li, H.-J. and Li, L. K. and Li,
Q. M. and Li, W. Z. and Li, Y. and Li, Y. B. and Liao, Y. P.
and Libby, J. and Lin, J. and Lin, S. and Liptak, Z. and
Liu, M. H. and Liu, Q. Y. and Liu, Z. and Liventsev, D. and
Longo, S. and Lozar, A. and Lyu, C. and Ma, J. L. and Ma, Y.
and Maggiora, M. and Maharana, S. P. and Maiti, R. and
Mancinelli, G. and Manfredi, R. and Manoni, E. and
Mantovano, M. and Marcantonio, D. and Marfoli, M. and
Marinas, C. and Martellini, C. and Martens, A. and Martinov,
T. and Massaccesi, L. and Masuda, M. and Matvienko, D. and
Maurya, S. K. and Maushart, M. and McKenna, J. A. and
Gruberová, Z. Mediankin and Mehta, R. and Meier, F. and
Meleshko, D. and Merola, M. and Miller, C. and Mirra, M. and
Miyabayashi, K. and Miyake, H. and Mizuk, R. and Mohanty, G.
B. and Moneta, S. and de Carvalho, A. L. Moreira and Moser,
H.-G. and Mrvar, M. and Murakami, H. and Nakamura, I. and
Nakao, M. and Nakazawa, Y. and Naruki, M. and Natkaniec, Z.
and Natochii, A. and Nayak, M. and Neu, M. and Nishida, S.
and Nomaru, R. and Ogawa, S. and Ono, H. and Otani, F. and
Pakhlova, G. and Panta, A. and Pardi, S. and Parham, K. and
Park, J. and Park, K. and Park, S.-H. and Passeri, A. and
Patra, S. and Paul, S. and Pedlar, T. K. and Pestotnik, R.
and Piccolo, M. and Piilonen, L. E. and Podesta-Lerma, P. L.
M. and Podobnik, T. and Praz, C. and Prell, S. and Prencipe,
E. and Prim, M. T. and Privalov, S. and Purwar, H. and
Rados, P. and Raiz, S. and Ravindran, K. and Rehman, J. U.
and Reif, M. and Reiter, S. and Reuter, L. and Ricalde
Herrmann, D. and Ripp-Baudot, I. and Rizzo, G. and
Robertson, S. H. and Roney, J. M. and Rostomyan, A. and
Rout, N. and Saha, S. and Salutari, L. and Sanders, D. A.
and Sandilya, S. and Santelj, L. and Santos, C. and Savinov,
V. and Scavino, B. and Schneider, S. and Schnell, G. and
Schnepf, M. and Schoenning, K. and Schwanda, C. and
Schwartz, A. J. and Seino, Y. and Senyo, K. and Serrano, J.
and Sevior, M. E. and Sfienti, C. and Shan, W. and Sharma,
G. and Shi, X. D. and Shillington, T. and Shimasaki, T. and
Shiu, J.-G. and Shtol, D. and Sibidanov, A. and Simon, F.
and Skorupa, J. and Sobotzik, M. and Soffer, A. and Sokolov,
A. and Solovieva, E. and Spataro, S. and Špenko, K. and
Spruck, B. and Starič, M. and Stavroulakis, P. and
Stefkova, S. and Stoetzer, L. and Stroili, R. and Sumihama,
M. and Sumisawa, K. and Takahashi, M. and Takizawa, M. and
Tamponi, U. and Tanaka, S. and Tang, S. S. and Tanida, K.
and Tenchini, F. and Testa, F. and Thaller, A. and Manh, T.
Tien and Tittel, O. and Tiwary, R. and Torassa, E. and
Trabelsi, K. and Trantou, F. F. and Tsaklidis, I. and Ueda,
I. and Unger, K. and Unno, Y. and Uno, K. and Uno, S. and
Urquijo, P. and Ushiroda, Y. and Vahsen, S. E. and van
Tonder, R. and Varvell, K. E. and Veronesi, M. and Vismaya,
V. S. and Vitale, L. and Vobbilisetti, V. and Volpe, R. and
Wakai, M. and Wallner, S. and Wang, M.-Z. and Warburton, A.
and Watanabe, M. and Watanuki, S. and Wessel, C. and Won, E.
and Xu, X. P. and Yabsley, B. D. and Yan, W. and Yelton, J.
and Yi, K. and Yin, J. H. and Yoshihara, K. and Yuan, J. and
Zani, L. and Zeng, F. and Zeyrek, M. and Zhang, B. and
Zhilich, V. and Zhou, J. S. and Zhou, Q. D. and Zhu, L. and
Žlebčík, R.},
collaboration = {Belle-{II Collaboration} and {Belle Collaboration}},
title = {{A} search for feebly-interacting particles in ${B}$ decays
with missing energy at {B}elle},
reportid = {PUBDB-2026-00304, arXiv:2601.07104. Belle II Preprint:
2025-029 KEK Preprint: 2025-36},
year = {2026},
note = {11 pages, 6 figures. Supplemental material included},
abstract = {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.},
cin = {BELLE},
cid = {I:(DE-H253)BELLE-20210408},
pnm = {611 - Fundamental Particles and Forces (POF4-611) / FAIME -
Flavour Anomalies with advanced particle Identification
MEthods (884719) / InterLeptons - A search for new
interactions at Belle II using leptons (947006)},
pid = {G:(DE-HGF)POF4-611 / G:(EU-Grant)884719 /
G:(EU-Grant)947006},
experiment = {EXP:(DE-H253)BELLE-20150101},
typ = {PUB:(DE-HGF)25},
eprint = {2601.07104},
howpublished = {arXiv:2601.07104},
archivePrefix = {arXiv},
SLACcitation = {$\%\%CITATION$ = $arXiv:2601.07104;\%\%$},
doi = {10.3204/PUBDB-2026-00304},
url = {https://bib-pubdb1.desy.de/record/643593},
}
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