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@ARTICLE{Abumusabh:642197,
author = {Abumusabh, M. and Adachi, I. and Adamczyk, K. 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
Aversano, M. 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 Baur, A. 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 Bhuyan, B. 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 Briere, R. A. 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, M.-C. and Chang,
P. and Cheema, P. 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 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 Di Canto, A. and Dingfelder,
J. and Doležal, Z. and Domínguez Jiménez, I. and Dong, T.
V. and Dong, X. and Dugic, K. and Dujany, G. and Ecker, P.
and Farkas, R. and Feichtinger, P. and Ferber, T. and
Fillinger, T. and Finck, C. and Finocchiaro, G. and Forti,
F. and Frey, A. 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 Gaz, A. 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 Gradl, W. and Graziani, E. and
Greenwald, D. and Guan, Y. and Gudkova, K. and Haide, I. and
Han, Y. and Harris, C. 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 Huang, A.
and Humair, T. and Iijima, T. and Inami, K. and Inguglia, G.
and Ipsita, N. and Ishikawa, A. and Itoh, R. and Iwasaki, M.
and Jackson, P. and Jacobi, D. and Jacobs, W. W. and Jaffe,
D. E. and Jang, E.-J. and Ji, Q. P. and Jia, S. and Jin, Y.
and Johnson, A. and Joo, K. K. and Kaliyar, A. B. and
Kandra, J. and Kang, K. H. and Kang, S. and Karyan, G. and
Kawasaki, T. and Keil, F. and Ketter, C. and Kiesling, C.
and Kim, C.-H. and Kim, D. Y. and Kim, J.-Y. and Kim, K.-H.
and Kim, Y.-K. 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 Kulii, Y. and
Kumar, D. and Kumara, K. and Kunigo, T. and Kuzmin, A. and
Kwon, Y.-J. and Lacaprara, S. and Lalwani, K. 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, S. X. 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, Y. and Liu, Z. and Liventsev, D.
and Longo, S. and Lozar, A. and Lueck, T. and Luo, T. 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 Marcello, S. 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 Mitra, S. and
Miyabayashi, K. and Miyake, H. and Mizuk, R. and Mohanty, G.
B. and Mondal, S. and Moneta, S. and de Carvalho, A. L.
Moreira and Moser, H.-G. and Mrvar, M. and Murakami, H. and
Mussa, R. 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 Okubo, R. and Ono, H. and Onuki, Y. and Otani, F. and
Pakhlova, G. and Panta, A. and Pardi, S. and Parham, K. and
Park, J. and Park, S.-H. and Paschen, B. and Passeri, A. and
Patra, S. and Paul, S. and Pedlar, T. K. and Peruzzi, I. 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 Prudiiev, I. and Purwar, H. and Rados, P. and Raeuber,
G. and Raiz, S. and Raj, V. 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 Salutari, L. and Sanders, D. A. and Sandilya,
S. and Santelj, L. and Santos, C. and Savinov, V. and
Scavino, B. and Schmitt, C. and Schneider, S. and Schnepf,
M. and Schoenning, K. and Schwanda, C. and Seino, Y. and
Selce, A. 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 Shwartz, B. and Sibidanov, A. and Simon, F.
and Singh, J. B. and Skorupa, J. and Sobie, R. 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 Stroili, R. and
Sumihama, M. and Sumisawa, K. and Suwonjandee, N. and
Svidras, H. 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 Tien Manh, T.
and Tittel, O. and Tiwary, R. and Torassa, E. and Trantou,
F. F. and Tsaklidis, I. and Uchida, M. and Ueda, I. and
Uglov, T. 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 Wang, X. L.
and Wang, Z. and Warburton, A. and Watanuki, S. and Wessel,
C. and Won, E. and Xu, X. P. and Yamada, S. and Yan, W. and
Yang, S. B. and Yelton, J. and Yi, K. and Yin, J. H. and
Yoshihara, K. and Yuan, C. Z. 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}},
title = {{F}irst search for ${B} \rightarrow {X}_{s} ν\barν$
decays},
reportid = {PUBDB-2025-05393, arXiv:2511.10980. Belle II Preprint
2025-025. KEK Preprint 2025-27},
year = {2025},
note = {8 pages, 2 figures + supplemental material},
abstract = {We report the first search for the flavor-changing
neutral-current decays $B \rightarrow X_{s} ν\barν$, where
$X_{s}$ is a hadronic system with strangeness equal to 1, in
data collected with the Belle~II detector at the SuperKEKB
asymmetric-energy $e^+e^-$ collider. The data sample
corresponds to an integrated luminosity of
$365~\textrm{fb}^{-1}$ collected at the $Υ(4S)$ resonance
and $43~\textrm{fb}^{-1}$ collected at a center-of-mass
energy $60~\textrm{MeV}$ below resonance for estimation of
$e^+e^-\to q\bar{q}$ continuum background. One of the $B$
mesons from the $Υ(4S) \to B\bar{B}$ decay is fully
reconstructed in a hadronic decay mode. The $B \to X_s
ν\barν$ decay is reconstructed with a sum-of-exclusives
approach that uses 30 $X_s$ decay modes. This approach
provides high sensitivity to the inclusive decay, despite
the presence of two undetected neutrinos. The search is
performed in three regions of the $X_{s}$ mass, chosen to
separate contributions from prominent resonances. We do not
observe a significant signal and set upper limits at 90\%
confidence level on the partial branching fractions for the
regions $0.0 < M_{X_{s}} < 0.6~\textrm{GeV}/c^{2}$, $0.6 <
M_{X_{s}} < 1.0~\textrm{GeV}/c^{2}$, and
$1.0~\textrm{GeV}/c^{2} < M_{X_{s}}$ of $2.2 \times
10^{-5}$, $9.5 \times 10^{-5}$, and $31.2 \times 10^{-5}$,
respectively. Combining the three mass regions, we obtain
the upper limit on the branching fraction, $B(B \to X_s
ν\barν) < 3.2 \times 10^{-4}$.},
cin = {BELLE},
cid = {I:(DE-H253)BELLE-20210408},
pnm = {611 - Fundamental Particles and Forces (POF4-611) / FLAVOUR
- Towards the Construction of the Fundamental Theory of
Flavour (267104) / FAIME - Flavour Anomalies with advanced
particle Identification MEthods (884719) / NIOBE -
Non-Leptonic Three-Body B Decays: Theory and Phenomenology
(700525) / TAULEPGAMMA - Search for the Lepton Flavour
Violating Decay Tau to Lepton + Gamma at the Belle II
Experiment (101026516) / JENNIFER2 - Japan and Europe
Network for Neutrino and Intensity Frontier Experimental
Research 2 (822070)},
pid = {G:(DE-HGF)POF4-611 / G:(EU-Grant)267104 /
G:(EU-Grant)884719 / G:(EU-Grant)700525 /
G:(EU-Grant)101026516 / G:(EU-Grant)822070},
experiment = {EXP:(DE-H253)BELLE-20150101},
typ = {PUB:(DE-HGF)25},
eprint = {2511.10980},
howpublished = {arXiv:2511.10980},
archivePrefix = {arXiv},
SLACcitation = {$\%\%CITATION$ = $arXiv:2511.10980;\%\%$},
doi = {10.3204/PUBDB-2025-05393},
url = {https://bib-pubdb1.desy.de/record/642197},
}
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