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@ARTICLE{Abumusabh:646266,
author = {Abumusabh, Merna and Adachi, Ichiro and Adamczyk, Karol
Mateusz and Aggarwal, Agrim and Aggarwal, Latika and Ahmed,
Hossain and Ahn, YongHeon and Aihara, Hiroaki and Akopov,
Norayr and Alghamdi, Saleh and Alhakami, Mohammad Hasan and
Aloisio, Alberto and Althubiti, Numa and Amos, Kieran and
Nguyen, Anh-Ky and Antonioli, Cecilia and Asner, David Mark
and Atmacan, Hulya and Aushev, Tagir and Ayad, Rachid and
Babu, Varghese and Bae, Hanwook and Baghel, Naveen Kumar and
Bahinipati, Seema and Bambade, Philip and Banerjee, Swagato
and Barrett, Matthew and Bartl, Martin and Baudot, Jerome
and Beaubien, Alexandre and Becherer, Fabian Horst and
Becker, Juergen and Bennett, Jake and Bernlochner, Florian
and Bertacchi, Valerio and Bertemes, Michel and Bertholet,
Emilie and Bessner, Martin and Bettarini, Stefano and
Bianchi, Fabrizio and Bilka, Tadeas and Biswas, Diptaparna
and Bobrov, Alexander and Bodrov, Denis and Bondar,
Alexander E. and Bonvicini, Giovanni and Borah, Jyotirmoi
and Boschetti, Alessandro and Bozek, Andrzej and Bracko,
Marko and Branchini, Paolo and Briere, Roy and Browder,
Thomas Earl and Budano, Antonio and Bussino, Severino and
Campagna, Quinn and Campajola, Marcello and Cao, Lu and
Casarosa, Giulia and Cecchi, Claudia and Chang, Paoti and
Cheema, Priyanka and Chen, Liangliang and Cheon, ByungGu and
Cheshta, Cheshta and Chetri, Hridey and Chilikin, Kirill and
Chirapatpimol, Khem and Cho, HanEol and Cho, Kihyeon and
Cho, Sungjin and Choi, Sookyung and Choudhury, Seema and
Chutia, Sourabh and Cochran, James Herbert and Colorado,
Johan Andres and Consigny, Isaac-Paul and Corona, Luigi and
Cui, Junxi and De La Cruz Burelo, Eduard and De La Motte,
Shanette Anne and de Marino, Gaetano and De Nardo, Guglielmo
and De Pietro, Giacomo and de Sangro, Riccardo and
Destefanis, Marco and Dey, Sourav and Dhayal, Ravinder and
Di Canto, Angelo and Dingfelder, Jochen and Dolezal, Zdenek
and Dominguez Jimenez, Isabel and Dong, Thanh Van and Dong,
Xu and Dorigo, Mirco and Dujany, Giulio and Ecker, Patrick
and Epifanov, Denis Alexandrovich and Eppelt, Jonas and
Farkas, Ralf and Feichtinger, Paul and Ferber, Torben and
Fillinger, Tristan and Finck, Christian and Finocchiaro,
Giuseppe and Forti, Francesco and Frey, Ariane and Fulsom,
Bryan Gregory and Gabrielli, Alice and Ganiev, Eldar and
Garcia Hernandez, Marcela and Garg, Renu and Gaertner,
Lorenz Ennio and Gaudino, Giovanni and Gaur, Vipin and
Gautam, Varsha and Gaz, Alessandro and Gellrich, Andreas and
Ghevondyan, Gayane and Giordano, Raffaele and Giri, Anjan
and Gironella Gironell, Pere and Glazov, Alexander and
Gobbo, Benigno and Godang, Romulus and Gogota, Olga and
Goldenzweig, Pablo and Gradl, Wolfgang and Graziani, Enrico
and Greenwald, Daniel and Gudkova, Kristina and Haide,
Isabel and Han, Yubo and Hayashii, Hisaki and Hazra, Sagar
and Hearty, Christopher and Hedges, Michael Thomas and
Heidelbach, Alexander and Heine, Greta and Heredia de la
Cruz, Ivan and Higuchi, Takeo and Hoek, Matthias and
Hohmann, Marcel and Hoppe, Raimundo and Horak, Philipp and
Hou, Xiantao and Hsu, Chia-Ling and Huang, Andre Hao Yuan
and Humair, Thibaud and Iijima, Toru and Inami, Kenji and
Inguglia, Gianluca and Ipsita, N. Sushree and Ishikawa,
Akimasa and Itoh, Ryosuke and Iwasaki, Masako and Jackson,
Paul Douglas and Jacobi, Daniel and Jacobs, William Wescott
and Jang, Eunji and Ji, Qingping and Jia, Sen and Jin, Yifan
and Johnson, Ansu and Kandra, Jakub and Kang, Kookhyun and
Kang, Shuaiyan and Karyan, Gevorg and Keil, Felix and
Ketter, Christopher and Khan, Munira and Kiesling, Christian
and Kim, Doris Yangsoo and Kim, Hyuna and Kim, Jaeyoung and
Kim, Kyungho and Kindo, Haruki and Kinoshita, Kay and Kodys,
Peter and Koga, Taichiro and Kohani, Shahab and Korobov,
Alexandr and Korpar, Samo and Kovalenko, Evgeniy and
Kowalewski, Robert and Krizan, Peter and Krokovny, Pavel and
Kuhr, Thomas and Kumar, Devender and Kumar, Jitendra and
Kumar, Rajeev and Kumara, Kospalage Janaka and Kunigo,
Takuto and Kuzmin, Alexander and Kwon, Youngjoon and
Lacaprara, Stefano and Lam, Tommy and Lanceri, Livio and
Lange, Jens Soeren and Lau, Tak Shun and Laurenza, Martina
and Leboucher, Robin and Le Diberder, Francois Rene and Lee,
Hobin and Lee, MyeongJae and Lemettais, Clotilde and Leo,
Paolo and Lewis, Peter and Li, Chunhua and Li, Huijing and
Li, Longke and Li, Qiming and Li, Wenzhe and Li, Yang and
Liao, Yipu and Libby, James Frederick and Lin, Jie-Cheng and
Lin, Shu-Ping and Lisovskyi, Vitalii and Liu, Meihong and
Liu, Qingyuan and Liu, Zhiqing and Liventsev, Dmitri and
Longo, Savino and Lozar, Andrej and Lueck, Thomas and Lyu,
Chaoyi and Ma, Junli and Ma, Yue and Maggiora, Marco and
Prabha Maharana, Swarna and Maiti, Rajesh Kumar and
Mancinelli, Giampiero and Manfredi, Riccardo and Manoni,
Elisa and Mantovano, Michele and Marcantonio, Daniel and
Marfoli, Mattia and Marinas, Carlos and Martellini, Cristina
and Martens, Aurelien and Martinov, Tommy and Massaccesi,
Ludovico and Masuda, Masataka and Matvienko, Dmitry and
Maurya, Shubhangi Krishan and Maushart, Matteo Manuel and
McKenna, Janis Anne and Mediankin Gruberova, Zuzana and
Mehta, Rishabh and Meier, Frank and Meleshko, Dmytro and
Merola, Mario and Miller, Caleb and Mirra, Marco and
Miyabayashi, Kenkichi and Miyake, Hideki and Mizuk, Roman
and Mohanty, Gagan Bihari and Moneta, Stefano and Moser,
Hans-Guenther and Mussa, Roberto and Nakamura, Isamu and
Nakao, Mikihiko and Nakazawa, Yu and Naruki, Megumi and
Natkaniec, Zbigniew Marian and Natochii, Andrii and Nayak,
Minakshi and Neu, Marc and Niiyama, Masayuki and Nishida,
Shohei and Nomaru, Riku and Novosel, Anja and Ogawa, Satoru
and Okubo, Ryogo and Ono, Hiroaki and Otani, Fumiaki and
Pakhlov, Pavel and Pakhlova, Galina and Panta, Anil and
Pardi, Silvio and Parham, Katherine and Park, Junewoo and
Park, Kihong and Park, Seokhee and Passeri, Antonio and
Patra, Sourav and Paul, Stephan Martin and Pedlar, Todd
Kristofer and Pestotnik, Rok and Piccolo, Marcello and
Piilonen, Leo and Podesta lerma, Pedro Luis Manuel and
Podobnik, Tomaz and Praz, Cyrille and Prell, Soeren and
Prim, Markus Tobias and Privalov, Sergey and Prudiiev, Ihor
and Purwar, Harsh and Rados, Petar and Raiz, Sebastiano and
Ravindran, Krishnakumar and Ur Rehman, Junaid and Reif,
Markus and Reiter, Simon and Reuter, Lea and Ricalde
Herrmann, Daniel Enrique and Ripp-Baudot, Isabelle and
Rizzo, Giuliana and Robertson, Steven H. and Roney, John
Michael and Rostomyan, Armine and Rout, Niharika and Saha,
Sahil and Salutari, Laura and Sanders, David Alan and
Sandilya, Saurabh and Santelj, Luka and Santos, Corentin and
Savinov, Vladimir and Scavino, Bianca and Schmitt, Caspar
and Schneider, Simon and Schnell, Gunar and Schoenning,
Karin and Schwanda, Christoph and Schwartz, Alan Jay and
Seino, Yoshiaki and Senyo, Katsumi and Serrano, Justine and
Sevior, Martin Edmund and Sfienti, Concettina and Shan, Wei
and Sharma, Gaurav and Shi, Xiaodong and Shillington, Trevor
and Shimasaki, Tomoyuki and Shiu, Jing-Ge and Shtol, Dmitry
and Shwartz, Boris and Sibidanov, Alexei and Simon, Frank
and Skorupa, Justin and Sobie, Randall and Sobotzik, Martin
and Soffer, Abner and Solovieva, Elena and Spataro, Stefano
and Spenko, Kristof and Spruck, Bjoern and Staric, Marko and
Stavroulakis, Petros and Stefkova, Slavomira and Stroili,
Roberto and Sumihama, Mizuki and Suwonjandee, Narumon and
Takahashi, Maiko and Takizawa, Makoto and Tamponi, Umberto
and Tanida, Kiyoshi and Tenchini, Francesco and Testa,
Federico and Thaller, Arthur and Tran, Tien Manh and Tittel,
Oskar and Tiwary, Rahul and Torassa, Ezio and Trabelsi,
Karim and Trantou, Foteini Faidra and Tsaklidis, Ilias and
Ueda, Ikuo and Unger, Kai Lukas and Unno, Yuji and Uno,
Kenta and Uno, Shoji and Urquijo, Phillip and Ushiroda,
Yutaka and Vahsen, Sven Einar and van Tonder, Raynette and
Varvell, Kevin Ernest and Veronesi, Michele and V S, Vismaya
and Vitale, Lorenzo and Vobbilisetti, Vidya Sagar and Volpe,
Roberta and Wakai, Miho and Wallner, Stefan and Wang, Min-Zu
and Warburton, Andreas and Watanabe, Minori and Watanuki,
Shun and Wessel, Christian and Won, Eunil and Xu, Xinping
and Yabsley, Bruce Donald and Yan, Wenbiao and Yan, Wenpeng
and Yelton, John and Yi, Kai and Yin, Junhao and Yoshihara,
Keisuke and Yuan, Jing and Zani, Laura and Zeng, Fanli and
Zeyrek, Mehmet Tevfik and Zhang, Boyang and Zhilich, Victor
and Zhou, Jianshe and Zhou, Qi-Dong and Zhu, Lin and
Zlebcik, Radek},
collaboration = {Belle-{II Collaboration} and {Belle Collaboration}},
title = {{S}tudy of ${B}^+ \to μ^+ ν_μ$ decays at {B}elle and
{B}elle {II}},
reportid = {PUBDB-2026-00789, arXiv:2602.09800. Belle II Preprint:
2026-001 KEK Preprint: 2025-38},
year = {2026},
abstract = {We report a measurement of the branching fraction for the
leptonic decay $B^+\toμ^+ν_μ$. This work presents the
first $B^+\toμ^+ν_μ$ result using Belle~II data, an
updated Belle measurement that supersedes the previous
result, and their combination, which yields the most precise
search to date. The analysis is based on
$1076\,\mathrm{fb}^{-1}$ of $e^+e^-$ collision data
collected at a center-of-mass energy of
$10.58\,\mathrm{GeV}$ with the Belle and Belle~II detectors
at the KEKB and SuperKEKB colliders, respectively. We
measure $\mathcal{B}(B^+\toμ^+ν_μ)=(4.4\pm1.9\pm
1.0)\times10^{-7}$, where the first uncertainty is
statistical and the second systematic. The observed
significance relative to the background-only hypothesis is
2.4 standard deviations. We set a 90\% confidence level
upper limit of
$\mathcal{B}(B^+\toμ^+ν_μ)<6.7\times10^{-7}$ using a
frequentist approach and a 90\% credibility level upper
limit of $\mathcal{B}(B^+\toμ^+ν_μ)<7.2\times 10^{-7}$
using a Bayesian approach. These are the most stringent
limits to date. The result is interpreted as an exclusion
region in the parameter space of type~II and type~III
two-Higgs-doublet models. We search for stable sterile
neutrinos with masses $m_N\in[0,1.5]\,\mathrm{GeV}$. No
signal is observed, and the resulting exclusion on the
squared mixing parameter $|U_{μN}|^2$ provides improvement
over previous limits. We report a measurement of the partial
branching fraction of semileptonic $B\to X_u\ellν_\ell$
decays with $p_μ^B>2.2\,\mathrm{GeV}$, obtaining
$Δ\mathcal{B}(B\to
X_u\ellν_\ell)=(2.72\pm0.05\pm0.29)\times10^{-4}$. We
present a model-dependent study of weak annihilation decays
using the muon momentum spectrum. We observe a signal of 2.4
standard deviations above the background-only hypothesis in
regions where the distribution resembles that of $B\to
X_u\ellν_\ell$ decays.},
cin = {BELLE},
cid = {I:(DE-H253)BELLE-20210408},
pnm = {611 - Fundamental Particles and Forces (POF4-611)},
pid = {G:(DE-HGF)POF4-611},
experiment = {EXP:(DE-H253)BELLE-20150101},
typ = {PUB:(DE-HGF)25},
eprint = {2602.09800},
howpublished = {arXiv:2602.09800},
archivePrefix = {arXiv},
SLACcitation = {$\%\%CITATION$ = $arXiv:2602.09800;\%\%$},
url = {https://bib-pubdb1.desy.de/record/646266},
}
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