Λεπτομέρειες βιβλιογραφικής εγγραφής
| Τίτλος: |
Study of $B^+ \to μ^+ ν_μ$ decays at Belle and Belle II |
| Συγγραφείς: |
Belle, Collaborations, Belle II, Abumusabh, M., Adachi, I., Adamczyk, K., Aggarwal, A., Aggarwal, L., Ahmed, H., Ahn, Y., Aihara, H., Akopov, N., Alghamdi, S., Alhakami, M., Aloisio, A., Althubiti, N., Amos, K., Ky, N. Anh, Antonioli, C., Asner, D. M., Atmacan, H., Aushev, T., Ayad, R., Babu, V., Bae, H., Baghel, N. K., Bahinipati, S., Bambade, P., Banerjee, Sw., Barrett, M., Bartl, M., Baudot, J., Beaubien, A., Becherer, F., Becker, J., Bennett, J. V., Bernlochner, F. U., Bertacchi, V., Bertemes, M., Bertholet, E., Bessner, M., Bettarini, S., Bianchi, F., Bilka, T., Biswas, D., Bobrov, A., Bodrov, D., Bondar, A., Bonvicini, G., Borah, J., Boschetti, A., Bozek, A., Bračko, M., Branchini, P., Briere, R. A., Browder, T. E., Budano, A., Bussino, S., Campagna, Q., Campajola, M., Cao, L., Casarosa, G., Cecchi, C., Chang, P., Cheema, P., Chen, L., Cheon, B. G., Cheshta, C., Chetri, H., Chilikin, K., Chirapatpimol, K., Cho, H. -E., Cho, K., Cho, S. -J., Choi, S. -K., Choudhury, S., Chutia, S., Cochran, J., Colorado-Caicedo, J. A., Consigny, I., Corona, L., Cui, J. X., De La Cruz-Burelo, E., De La Motte, S. A., de Marino, G., De Nardo, G., De Pietro, G., de Sangro, R., Destefanis, M., Dey, S., Dhayal, R., Di Canto, A., Dingfelder, J., Doležal, Z., Jiménez, I. Domínguez, Dong, T. V., Dong, X., Dorigo, M., Dujany, G., Ecker, P., Epifanov, D., Eppelt, J., Farkas, R., Feichtinger, P., Ferber, T., Fillinger, T., Finck, C., Finocchiaro, G., Forti, F., Frey, A., Fulsom, B. G., Gabrielli, A., Ganiev, E., Garcia-Hernandez, M., Garg, R., Gärtner, L., Gaudino, G., Gaur, V., Gautam, V., Gaz, A., Gellrich, A., Ghevondyan, G., Giordano, R., Giri, A., Gironell, P. Gironella, Glazov, A., Gobbo, B., Godang, R., Gogota, O., Goldenzweig, P., Gradl, W., Graziani, E., Greenwald, D., Gudkova, K., Haide, I., Han, Y., Hayashii, H., Hazra, S., Hearty, C., Hedges, M. T., Heidelbach, A., Heine, G., de la Cruz, I. Heredia, Higuchi, T., Hoek, M., Hohmann, M., Hoppe, R., Horak, P., Hou, X. T., Hsu, C. -L., Huang, A., Humair, T., Iijima, T., Inami, K., Inguglia, G., Ipsita, N., Ishikawa, A., Itoh, R., Iwasaki, M., Jackson, P., Jacobi, D., Jacobs, W. W., Jang, E. -J., Ji, Q. P., Jia, S., Jin, Y., Johnson, A., Kandra, J., Kang, K. H., Kang, S., Karyan, G., Keil, F., Ketter, C., Khan, M., Kiesling, C., Kim, D. Y., Kim, H., Kim, J. -Y., Kim, K. -H., Kindo, H., Kinoshita, K., Kodyš, P., Koga, T., Kohani, S., Korobov, A., Korpar, S., Kovalenko, E., Kowalewski, R., Križan, P., Krokovny, P., Kuhr, T., Kumar, D., Kumar, J., Kumar, R., Kumara, K., Kunigo, T., Kuzmin, A., Kwon, Y. -J., Lacaprara, S., Lam, T., Lanceri, L., Lange, J. S., Lau, T. S., Laurenza, M., Leboucher, R., Diberder, F. R. Le, Lee, H., Lee, M. J., Lemettais, C., Leo, P., Lewis, P. M., Li, C., Li, H. -J., Li, L. K., Li, Q. M., Li, W. Z., Li, Y., Liao, Y. P., Libby, J., Lin, J., Lin, S., Lisovskyi, V., Liu, M. H., Liu, Q. Y., Liu, Z. Q., Liventsev, D., Longo, S., Lozar, A., Lueck, T., Lyu, C., Ma, J. L., Ma, Y., Maggiora, M., Maharana, S. P., Maiti, R., Mancinelli, G., Manfredi, R., Manoni, E., Mantovano, M., Marcantonio, D., Marfoli, M., Marinas, C., Martellini, C., Martens, A., Martinov, T., Massaccesi, L., Masuda, M., Matvienko, D., Maurya, S. K., Maushart, M., McKenna, J. A., Gruberová, Z. Mediankin, Mehta, R., Meier, F., Meleshko, D., Merola, M., Miller, C., Mirra, M., Miyabayashi, K., Miyake, H., Mizuk, R., Mohanty, G. B., Moneta, S., Moser, H. -G., Mussa, R., Nakamura, I., Nakao, M., Nakazawa, Y., Naruki, M., Natkaniec, Z., Natochii, A., Nayak, M., Neu, M., Niiyama, M., Nishida, S., Nomaru, R., Novosel, A., Ogawa, S., Okubo, R., Ono, H., Otani, F., Pakhlov, P., Pakhlova, G., Panta, A., Pardi, S., Parham, K., Park, J., Park, K., Park, S. -H., Passeri, A., Patra, S., Paul, S., Pedlar, T. K., Pestotnik, R., Piccolo, M., Piilonen, L. E., Podesta-Lerma, P. L. M., Podobnik, T., Praz, C., Prell, S., Prim, M. T., Privalov, S., Prudiiev, I., Purwar, H., Rados, P., Raiz, S., Ravindran, K., Rehman, J. U., Reif, M., Reiter, S., Reuter, L., Herrmann, D. Ricalde, Ripp-Baudot, I., Rizzo, G., Robertson, S. H., Roney, J. M., Rostomyan, A., Rout, N., Saha, S., Salutari, L., Sanders, D. A., Sandilya, S., Santelj, L., Santos, C., Savinov, V., Scavino, B., Schmitt, C., Schneider, S., Schnell, G., Schoenning, K., Schwanda, C., Schwartz, A. J., Seino, Y., Senyo, K., Serrano, J., Sevior, M. E., Sfienti, C., Shan, W., Sharma, G., Shi, X. D., Shillington, T., Shimasaki, T., Shiu, J. -G., Shtol, D., Shwartz, B., Sibidanov, A., Simon, F., Skorupa, J., Sobie, R. J., Sobotzik, M., Soffer, A., Solovieva, E., Spataro, S., Špenko, K., Spruck, B., Starič, M., Stavroulakis, P., Stefkova, S., Stroili, R., Sumihama, M., Suwonjandee, N., Takahashi, M., Takizawa, M., Tamponi, U., Tanida, K., Tenchini, F., Testa, F., Thaller, A., Manh, T. Tien, Tittel, O., Tiwary, R., Torassa, E., Trabelsi, K., Trantou, F. F., Tsaklidis, I., Ueda, I., Unger, K., Unno, Y., Uno, K., Uno, S., Urquijo, P., Ushiroda, Y., Vahsen, S. E., van Tonder, R., Varvell, K. E., Veronesi, M., Vismaya, V. S., Vitale, L., Vobbilisetti, V., Volpe, R., Wakai, M., Wallner, S., Wang, M. -Z., Warburton, A., Watanabe, M., Watanuki, S., Wessel, C., Won, E., Xu, X. P., Yabsley, B. D., Yan, W., Yelton, J., Yi, K., Yin, J. H., Yoshihara, K., Yuan, J., Zani, L., Zeng, F., Zeyrek, M., Zhang, B., Zhilich, V., Zhou, J. S., Zhou, Q. D., Zhu, L., Žlebčík, R. |
| Πηγή: |
Phys. Rev. D 113, 112012 (2026) |
| Έτος έκδοσης: |
2026 |
| Συλλογή: |
High Energy Physics - Experiment |
| Θεματικοί όροι: |
High Energy Physics - Experiment |
| Περιγραφή: |
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. |
| Τύπος εγγράφου: |
Working Paper |
| DOI: |
10.48550/arXiv.2602.09800 |
| Σύνδεσμος πρόσβασης: |
https://arxiv.org/abs/2602.09800 |
| Αριθμός Καταχώρησης: |
edsarx.2602.09800 |
| Βάση Δεδομένων: |
arXiv |