Measurement of the Decays $\boldsymbol{B\to\eta\ell\nu_\ell}$ and $\boldsymbol{B\to\eta^\prime\ell\nu_\ell}$ in Fully Reconstructed Events at Belle
| Popis: | We report branching fraction measurements of the decays $B^+\to\eta\ell^+\nu_\ell$ and $B^+\to\eta^\prime\ell^+\nu_\ell$ based on 711~fb$^{-1}$ of data collected near the $\Upsilon(4S)$ resonance with the Belle experiment at the KEKB asymmetric-energy $e^+e^-$ collider. This data sample contains 772 million $B\bar B$~events. One of the two $B$~mesons is fully reconstructed in a hadronic decay mode. Among the remaining ('signal-$B$') daughters, we search for the $\eta$~meson in two decay channels, $\eta\to\gamma\gamma$ and $\eta\to\pi^+\pi^-\pi^0$, and reconstruct the $\eta^{\prime}$~meson in $\eta^\prime\to\eta\pi^+\pi^-$ with subsequent decay of the $\eta$ into $\gamma\gamma$. Combining the two $\eta$ modes and using an extended maximum likelihood, the $B^+\to\eta\ell^+\nu_\ell$ branching fraction is measured to be $(4.2\pm 1.1 (\rm stat.)\pm 0.3 (\rm syst.))\times 10^{-5}$. For $B^+\to\eta^\prime\ell^+\nu_\ell$, we observe no significant signal and set an upper limit of $0.72\times 10^{-4}$ at 90\% confidence level. |
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| Jazyk: | English |
| DOI: | 10.3204/pubdb-2017-02395 |
| Přístupová URL adresa: | https://explore.openaire.eu/search/publication?articleId=doi_________::eb92c741857ebf637d0b5ba555772512 |
| Přírůstkové číslo: | edsair.doi...........eb92c741857ebf637d0b5ba555772512 |
| Autor: | Beleño, C., Dingfelder, J., Urquijo, P., Aihara, H., Al Said, S., Asner, D. M., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bakich, A. M., Bansal, V., Behera, P., Bhuyan, B., Biswal, J., Bobrov, A., Bračko, M., Browder, T. E., Červenkov, D., Chen, A., Cheon, B. G., Chistov, R., Cho, K., Choi, S.-K., Choi, Y., Cinabro, D., Dash, N., Di Carlo, S., Doležal, Z., Eidelman, S., Farhat, H., Fast, J. E., Ferber, T., Frey, A., Fulsom, B. G., Gaur, V., Gabyshev, N., Garmash, A., Gillard, R., Goldenzweig, P., Hara, T., Hayashii, H., Hedges, M. T., Hou, W.-S., Iijima, T., Inami, K., Inguglia, G., Ishikawa, A., Itoh, R., Iwasaki, Y., Jeon, H. B., Jin, Y., Joffe, D., Joo, K. K., Kang, K. H., Karyan, G., Kim, D. Y., Kim, J. B., Kim, K. T., Kim, M. J., Kim, Y. J., Kinoshita, K., Kodyš, P., Korpar, S., Kotchetkov, D., Križan, P., Kulasiri, R., Lee, I. S., Li, Y., Li Gioi, L., Libby, J., Liventsev, D., Lubej, M., Luo, T., Masuda, M., Matsuda, T., Matvienko, D., Miyabayashi, K., Miyata, H., Moon, H. K., Mori, T., Nakano, E., Nakao, M., Nanut, T., Nath, K. J., Nayak, M., Nishida, S., Ogawa, S., Okuno, S., Ono, H., Pal, B., Park, C.-S., Park, C. W., Park, H., Pedlar, T. K., Pestotnik, R., Piilonen, L. E., Ritter, M., Sakai, Y., Salehi, M., Sandilya, S., Sanuki, T., Schneider, O., Schnell, G., Schwanda, C., Seino, Y., Senyo, K., Seon, O., Sevior, M. E., Shebalin, V., Shibata, T.-A., Shiu, J.-G., Simon, F., Solovieva, E., Starič, M., Sumiyoshi, T., Takizawa, M., Tamponi, U., Tanida, K., Tenchini, F., Uchida, M., Uglov, T., Unno, Y., Uno, S., Usov, Y., Van Hulse, C., Varner, G., Varvell, K. E., Vinokurova, A., Vorobyev, V., Wang, C. H., Wang, M.-Z., Wang, P., Watanabe, Y., Widmann, E., Won, E., Yamashita, Y., Ye, Hua, Yelton, J., Yook, Y., Zhang, Z. P., Zhilich, V., Zhukova, V., Zhulanov, V., Zupanc, A. |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
eta: radiative decay
Upsilon(10570): electroproduction B: pair production eta --> pi+ pi- pi0 pi: multiple production B+ --> eta lepton+ neutrino B+: branching ratio: measured B+: branching ratio: upper limit B: hadronic decay BELLE electron positron: colliding beams electron positron: annihilation decay modes eta(958): hadronic decay KEK-B High Energy Physics::Experiment photon: pair production Nuclear Experiment B+: semileptonic decay eta --> 2photon eta: hadronic decay eta(958) --> eta pi+ pi B+ --> eta(958) lepton+ neutrino experimental results 10.570 GeV-cms |
| DOI: | 10.3204/pubdb-2017-02395 |
| Popis: | We report branching fraction measurements of the decays $B^+\to\eta\ell^+\nu_\ell$ and $B^+\to\eta^\prime\ell^+\nu_\ell$ based on 711~fb$^{-1}$ of data collected near the $\Upsilon(4S)$ resonance with the Belle experiment at the KEKB asymmetric-energy $e^+e^-$ collider. This data sample contains 772 million $B\bar B$~events. One of the two $B$~mesons is fully reconstructed in a hadronic decay mode. Among the remaining ('signal-$B$') daughters, we search for the $\eta$~meson in two decay channels, $\eta\to\gamma\gamma$ and $\eta\to\pi^+\pi^-\pi^0$, and reconstruct the $\eta^{\prime}$~meson in $\eta^\prime\to\eta\pi^+\pi^-$ with subsequent decay of the $\eta$ into $\gamma\gamma$. Combining the two $\eta$ modes and using an extended maximum likelihood, the $B^+\to\eta\ell^+\nu_\ell$ branching fraction is measured to be $(4.2\pm 1.1 (\rm stat.)\pm 0.3 (\rm syst.))\times 10^{-5}$. For $B^+\to\eta^\prime\ell^+\nu_\ell$, we observe no significant signal and set an upper limit of $0.72\times 10^{-4}$ at 90\% confidence level. |
| Databáze: | OpenAIRE |
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