1. Search for $B^+ \to \mu^+\, \nu_\mu$ and $B^+ \to \mu^+\, N$ with inclusive tagging
- Author
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Prim, M. T., Bernlochner, F. U., Aulchenko, V., Lieret, K., Liventsev, D., Lu, P.-C., Luo, T., MacNaughton, J., Masuda, M., Matsuda, T., Matvienko, D., Merola, M., Metzner, F., Aushev, T., Miyabayashi, K., Mizuk, R., Mohanty, G. B., Mussa, R., Nakao, M., De Nardo, G., Nath, K. J., Natkaniec, Z., Nayak, M., Niiyama, M., Ayad, R., Nisar, N. K., Nishida, S., Nishimura, K., Ogawa, S., Ono, H., Onuki, Y., Pakhlov, P., Pakhlova, G., Pal, B., Pardi, S., Babu, V., Park, H., Park, S.-H., Patra, S., Paul, S., Pedlar, T. K., Pestotnik, R., Piilonen, L. E., Popov, V., Prencipe, E., Ritter, M., Bakich, A. M., Rostomyan, A., Rozanska, M., Russo, G., Sahoo, D., Sakai, Y., Santelj, L., Savinov, V., Schneider, O., Schnell, G., Schueler, J., Bansal, V., Schwanda, C., Seino, Y., Senyo, K., Sevior, M. E., Shebalin, V., Shiu, J.-G., Shwartz, B., Simon, F., Sokolov, A., Solovieva, E., Behera, P., Starič, M., Strube, J. F., Sumihama, M., Sumiyoshi, T., Sutcliffe, W., Takizawa, M., Tamponi, U., Tao, Y., Tenchini, F., Uchida, M., Beleño, C., Uglov, T., Unno, Y., Uno, S., Ushiroda, Y., Usov, Y., Vahsen, S. E., Van Tonder, R., Varner, G., Varvell, K. E., Vinokurova, A., Bhardwaj, V., Wang, B., Wang, C. H., Wang, M.-Z., Wang, P., Watanuki, S., Won, E., Yang, S. B., Ye, H., Yin, J. H., Yusa, Y., Bhuyan, B., Zhang, Z. P., Zhilich, V., Zhukova, V., Zhulanov, V., Belle Collaboration, Goldenzweig, P., Bilka, T., Biswal, J., Bobrov, A., Bozek, A., Bračko, M., Braun, N., Browder, T. E., Campajola, M., Cao, L., Červenkov, D., Heck, M., Chang, P., Chekelian, V., Chen, A., Cheon, B. G., Chilikin, K., Cho, H. E., Cho, K., Choi, Y., Choudhury, S., Cinabro, D., Adachi, I., Cunliffe, S., Doležal, Z., Eidelman, S., Epifanov, D., Fast, J. E., Ferber, T., Fulsom, B. G., Garg, R., Gaur, V., Garmash, A., Adamczyk, K., Giri, A., Grzymkowska, O., Guan, Y., Haba, J., Hara, T., Hayasaka, K., Hayashii, H., Hou, W.-S., Iijima, T., Inami, K., Aihara, H., Inguglia, G., Ishikawa, A., Iwasaki, M., Iwasaki, Y., Jia, S., Jin, Y., Joffe, D., Joo, K. K., Kaliyar, A. B., Karyan, G., Al Said, S., Kawasaki, T., Kichimi, H., Kiesling, C., Kim, C. H., Kim, D. Y., Kim, K. T., Kim, S. H., Kinoshita, K., Kodyš, P., Korpar, S., Asner, D. M., Kotchetkov, D., Križan, P., Kroeger, R., Krokovny, P., Kuhr, T., Kulasiri, R., Kumar, R., Kumita, T., Kuzmin, A., Kwon, Y.-J., Atmacan, H., Lalwani, K., Lange, J. S., Lee, I. S., Lee, J. K., Lee, J. Y., Lee, S. C., Lewis, P., Li, C. H., Li Gioi, L., Libby, J., Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Upsilon(10570): electroproduction ,coupling [Higgs particle] ,BELLE ,annihilation [electron positron] ,electron positron: annihilation ,massive [neutrino] ,mass: lower limit [neutrino] ,B+: leptonic decay ,sterile [neutrino] ,+muon%2B+neutrino%2Fmu%22">B+ --> muon+ neutrino/mu ,Higgs particle: doublet ,High Energy Physics - Experiment ,KEK-B ,neutrino: massive ,+muon%2B+neutrino%22">B+ --> muon+ neutrino ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,leptonic decay [B+] ,momentum spectrum [muon] ,Particle Physics Experiments ,ddc:530 ,Higgs particle: coupling ,doublet [Higgs particle] ,B+: branching ratio: upper limit ,High Energy Physics::Phenomenology ,branching ratio: upper limit [B+] ,resolution ,electron positron: colliding beams ,neutrino: sterile ,suppression ,sensitivity ,helicity ,frequentist [statistical analysis] ,neutrino: mass: lower limit ,CKM matrix ,electroproduction [Upsilon(10570)] ,statistical analysis: frequentist ,colliding beams [electron positron] ,High Energy Physics::Experiment ,muon: momentum spectrum ,experimental results - Abstract
Physical review / D 101(3), 032007 (2020). doi:10.1103/PhysRevD.101.032007, We report the result for a search for the leptonic decay of $B^+ \to \mu^+\, \nu_\mu$ using the full Belle dataset of 711 fb$^{-1}$ of integrated luminosity at the $ϒ(4S)$ resonance. In the Standard Model leptonic $B$-meson decays are helicity and Cabibbo-Kobayashi-Maskawa suppressed. To maximize sensitivity an inclusive tagging approach is used to reconstruct the second $B$ meson produced in the collision. The directional information from this second B meson is used to boost the observed μ into the signal B-meson rest frame, in which the μ has a monochromatic momentum spectrum. Though its momentum is smeared by the experimental resolution, this technique improves the analysis sensitivity considerably. Analyzing the $μ$ momentum spectrum in this frame we find $\mathcal{B}$($B^+ \to \mu^+\, \nu_\mu)=(5.3±2.0±0.9) × 10^{-7}$ with a one-sided significance of 2.8 standard deviations over the background-only hypothesis. This translates to a frequentist upper limit of $\mathcal{B}$($B^+ \to \mu^+\, \nu_\mu) < 8.6 × 10^{-7}$ at 90% confidence level. The experimental spectrum is then used to search for a massive sterile neutrino, $B^+ \to \mu^+\, N$, but no evidence is observed for a sterile neutrino with a mass in a range of 0–1.5 GeV. The determined $B^+ \to \mu^+\, \nu_\mu$ branching fraction limit is further used to constrain the mass and coupling space of the type II and type III two-Higgs-doublet models., Published by Inst.302363, Melville, NY
- Published
- 2020
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