학술논문

Measurement of Angular Coefficients of $\bar{B} \to D^* \ell \bar{\nu}_\ell$: Implications for $|V_{cb}|$ and Tests of Lepton Flavor Universality
Document Type
Working Paper
Author
Belle CollaborationPrim, M. T.Bernlochner, F.Metzner, F.Aihara, H.Asner, D. M.Aushev, T.Ayad, R.Babu, V.Banerjee, Sw.Behera, P.Belous, K.Bennett, J.Bessner, M.Bhardwaj, V.Bhuyan, B.Bilka, T.Biswas, D.Bodrov, D.Bondar, A.Borah, J.Bračko, M.Branchini, P.Browder, T. E.Budano, A.Campajola, M.Cao, L.Červenkov, D.Chang, P.Cheon, B. G.Choi, S. -K.Choi, Y.Choudhury, S.Cochran, J.Das, S.Dash, N.De Nardo, G.De Pietro, G.Dhamija, R.Di Capua, F.Doležal, Z.Dong, T. V.Dubey, S.Ecker, P.Epifanov, D.Ferber, T.Ferlewicz, D.Fulsom, B. G.Garg, R.Gaur, V.Giri, A.weig, P. GoldenzGu, T.Gudkova, K.Hadjivasiliou, C.Hara, T.Hayashii, H.Hazra, S.Hedges, M. T.Herrmann, D.Villanueva, M. HernándezHou, W. -S.Hsu, C. -L.Inami, K.Inguglia, G.Ipsita, N.Ishikawa, A.Itoh, R.Iwasaki, M.Jacobs, W. W.Kiesling, C.Kim, C. H.Kim, D. Y.Kim, K. -H.Kodyš, P.Konno, T.Korobov, A.Korpar, S.Kovalenko, E.Križan, P.Krokovny, P.Kuhr, T.Kumar, M.Kumar, R.Kwon, Y. -J.Lam, T.Lee, S. C.Lewis, P.Li, L. K.Gioi, L. LiLibby, J.Liventsev, D.Ma, Y.Matsuda, T.Matvienko, D.Maurya, S. K.Meier, F.Merola, M.Miyabayashi, K.Mizuk, R.Mohanty, G. B.Nakamura, I.Nakao, M.Narwal, D.Natkaniec, Z.Natochii, A.Nayak, L.Nishida, S.Ono, H.Oskin, P.Pakhlov, P.Pakhlova, G.Park, S. -H.Passeri, A.Patra, S.Pedlar, T. K.Pestotnik, R.Piilonen, L. E.Podobnik, T.Prencipe, E.Röhrken, M.Rout, N.Russo, G.Sandilya, S.Santelj, L.Savinov, V.Schmolz, P.Schnell, G.Schwanda, C.Seino, Y.Senyo, K.Shan, W.Shiu, J. -G.Singh, J. B.Solovieva, E.Starič, M.Stottler, Z. S.Sumihama, M.Takizawa, M.Tanida, K.Tenchini, F.Tiwary, R.Trabelsi, K.Unno, Y.Uno, S.Urquijo, P.Usov, Y.Vahsen, S. E.Varvell, K. E.Vossen, A.Wang, M. -Z.Wang, X. L.Won, E.Yabsley, B. D.Yan, W.Yang, S. B.Yin, J. H.Yuan, L.Zhang, Z. P.Zhilich, V.Zhukova, V.
Source
Subject
High Energy Physics - Experiment
High Energy Physics - Phenomenology
Language
Abstract
We measure the complete set of angular coefficients $J_i$ for exclusive $\bar{B} \to D^* \ell \bar{\nu}_\ell$ decays ($\ell = e, \mu$). Our analysis uses the full $711\,\mathrm{fb}^{-1}$ Belle data set with hadronic tag-side reconstruction. The results allow us to extract the form factors describing the $B \to D^*$ transition and the Cabibbo-Kobayashi-Maskawa matrix element $|V_{\rm cb}|$. Using recent lattice QCD calculations for the hadronic form factors, we find $|V_{\rm cb}| = (41.0 \pm 0.7) \times 10^3 $ using the BGL parameterization, compatible with determinations from inclusive semileptonic decays. We search for lepton flavor universality violation as a function of the hadronic recoil parameter $w$, and investigate the differences of the electron and muon angular distributions. We find no deviation from Standard Model expectations.