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arXiv · 1803.06444

Measurement of the branching fraction of $B \rightarrow D^{(*)}\pi \ell\nu$ at Belle using hadronic tagging in fully reconstructed events

A. Vossen·I. Adachi·K. Adamczyk·H. Aihara·S. Al Said·V. Aulchenko·T. Aushev·R. Ayad·I. Badhrees·V. Bansal·C. Beleño·B. Bhuyan·T. Bilka·J. Biswal·A. Bondar·A. Bozek·T. E. Browder·D. Červenkov·A. Chen·B. G. Cheon·K. Chilikin·K. Cho·S. -K. Choi·Y. Choi·S. Choudhury·D. Cinabro·S. Cunliffe·N. Dash·S. Di Carlo·Z. Doležal·S. Eidelman·J. E. Fast·T. Ferber·B. G. Fulsom·R. Garg·V. Gaur·N. Gabyshev·A. Garmash·M. Gelb·P. Goldenzweig·E. Guido·T. Hara·O. Hartbrich·K. Hayasaka·H. Hayashii·M. T. Hedges·S. Hirose·W. -S. Hou·K. Inami·A. Ishikawa·R. Itoh·Y. Iwasaki·W. W. Jacobs·I. Jaegle·S. Jia·Y. Jin·T. Julius·D. Y. Kim·H. J. Kim·J. B. Kim·K. T. Kim·S. H. Kim·K. Kinoshita·S. Korpar·D. Kotchetkov·R. Kroeger·P. Krokovny·T. Kuhr·R. Kulasiri·T. Kumita·J. S. Lange·I. S. Lee·S. C. Lee·L. K. Li·Y. Li·L. Li Gioi·J. Libby·D. Liventsev·M. Lubej·M. Masuda·M. Merola·K. Miyabayashi·H. Miyata·R. Mizuk·H. K. Moon·R. Mussa·E. Nakano·T. Nanut·K. J. Nath·M. Nayak·M. Niiyama·S. Nishida·H. Ono·P. Pakhlov·G. Pakhlova·B. Pal·S. Pardi·H. Park·S. Paul·T. K. Pedlar
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Abstract

We report a measurement of the branching fraction of the decay $B \rightarrow D^{(*)}\pi \ell\nu$. The analysis uses 772$\times 10^6$ $B\bar{B}$ pairs produced in $e^+e^-\rightarrow \Upsilon(4S)$ data recorded by the Belle experiment at the KEKB asymmetric-energy $e^+e^-$ collider. The tagging $B$ meson in the decay is fully reconstructed in a hadronic decay mode. On the signal side, we reconstruct the decay $B \rightarrow D^{(*)}\pi \ell\nu$ $(\ell=e,\mu)$. The measured branching fractions are $\mathcal{B}(B^+ \rightarrow D^-\pi^+ \ell^+\nu)$ = [4.55 $\pm$ 0.27 (stat.) $\pm$ 0.39 (syst.)]$\times 10^{-3}$, $\mathcal{B}(B^0 \rightarrow \bar{D}^0\pi^- \ell^+\nu)$ = [4.05 $\pm$ 0.36 (stat.) $\pm$ 0.41 (syst.)]$\times 10^{-3}$, $\mathcal{B}(B^+ \rightarrow D^{*-}\pi^+ \ell^+\nu)$ = [6.03 $\pm$ 0.43 (stat.) $\pm$ 0.38 (syst.)]$\times 10^{-3}$, and $\mathcal{B}(B^0 \rightarrow \bar{D}^{*0}\pi^- \ell^+\nu)$ = [6.46 $\pm$ 0.53 (stat.) $\pm$ 0.52 (syst.)]$\times 10^{-3}$. These are in good agreement with the current world average values.

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A. Vossen, I. Adachi, K. Adamczyk, H. Aihara, S. Al Said, V. Aulchenko, T. Aushev, R. Ayad, I. Badhrees, V. Bansal, C. Beleño, B. Bhuyan, T. Bilka, J. Biswal, A. Bondar, A. Bozek, T. E. Browder, D. Červenkov, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S. -K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, N. Dash, S. Di Carlo, Z. Doležal, S. Eidelman, J. E. Fast, T. Ferber, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, M. Gelb, P. Goldenzweig, E. Guido, T. Hara, O. Hartbrich, K. Hayasaka, H. Hayashii, M. T. Hedges, S. Hirose, W. -S. Hou, K. Inami, A. Ishikawa, R. Itoh, Y. Iwasaki, W. W. Jacobs, I. Jaegle, S. Jia, Y. Jin, T. Julius, D. Y. Kim, H. J. Kim, J. B. Kim, K. T. Kim, S. H. Kim, K. Kinoshita, S. Korpar, D. Kotchetkov, R. Kroeger, P. Krokovny, T. Kuhr, R. Kulasiri, T. Kumita, J. S. Lange, I. S. Lee, S. C. Lee, L. K. Li, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, M. Lubej, M. Masuda, M. Merola, K. Miyabayashi, H. Miyata, R. Mizuk, H. K. Moon, R. Mussa, E. Nakano, T. Nanut, K. J. Nath, M. Nayak, M. Niiyama, S. Nishida, H. Ono, P. Pakhlov, G. Pakhlova, B. Pal, S. Pardi, H. Park, S. Paul, T. K. Pedlar. 2018-03-17. Measurement of the branching fraction of $B \rightarrow D^{(*)}\pi \ell\nu$ at Belle using hadronic tagging in fully reconstructed events. https://doi.org/10.1103/physrevd.98.012005

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