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@ARTICLE{Beleo:442590,
      author       = {Beleño, C. and Frey, A. and Adachi, I. and Aihara, H. and
                      Asner, D. M. and Atmacan, H. and Aushev, T. and Ayad, R. and
                      Behera, P. and Bennett, J. and Bernlochner, F. and Bhardwaj,
                      V. and Bilka, T. and Biswal, J. and Bonvicini, G. and Bozek,
                      A. and Bračko, M. and Browder, T. E. and Campajola, M. and
                      Červenkov, D. and Chang, P. and Chen, A. and Chilikin, K.
                      and Cho, K. and Choi, Y. and Cinabro, D. and Cunliffe, S.
                      and Dash, N. and Di Capua, F. and Dingfelder, J. and
                      Doležal, Z. and Dong, T. V. and Eidelman, S. and Epifanov,
                      D. and Fast, J. E. and Ferber, T. and Fulsom, B. G. and
                      Garg, R. and Gaur, V. and Gabyshev, N. and Garmash, A. and
                      Giri, A. and Goldenzweig, P. and Guan, Y. and Hartbrich, O.
                      and Hayasaka, K. and Hayashii, H. and Hou, W.-S. and Inami,
                      K. and Ishikawa, A. and Iwasaki, M. and Jacobs, W. W. and
                      Jeon, H. B. and Jin, Y. and Joo, K. K. and Kiesling, C. and
                      Kim, B. H. and Kim, D. Y. and Kim, K.-H. and Kim, S. H. and
                      Kim, Y.-K. and Kimmel, T. D. and Kinoshita, K. and Kodyš,
                      P. and Korpar, S. and Kotchetkov, D. and Križan, P. and
                      Kroeger, R. and Krokovny, P. and Kuhr, T. and Kulasiri, R.
                      and Kumar, R. and Kuzmin, A. and Kwon, Y.-J. and Lalwani, K.
                      and Lee, S. C. and Li, L. K. and Li, Y. B. and Li Gioi, L.
                      and Libby, J. and Lieret, K. and Liventsev, D. and Luo, T.
                      and MacNaughton, J. and MacQueen, C. and Masuda, M. and
                      Matsuda, T. and Merola, M. and Miyabayashi, K. and Mohanty,
                      G. B. and Moon, T. J. and Mori, T. and Mrvar, M. and Nakao,
                      M. and Nisar, N. K. and Nishida, S. and Ogawa, S. and Ono,
                      H. and Oskin, P. and Pakhlov, P. and Pakhlova, G. and Pardi,
                      S. and Park, H. and Patra, S. and Pedlar, T. K. and
                      Pestotnik, R. and Piilonen, L. E. and Podobnik, T. and
                      Prencipe, E. and Prim, M. T. and Rostomyan, A. and Rout, N.
                      and Russo, G. and Sahoo, D. and Sakai, Y. and Sandilya, S.
                      and Sangal, A. and Sanuki, T. and Savinov, V. and Schnell,
                      G. and Schwanda, C. and Schwartz, A. J. and Schwenker, B.
                      and Seino, Y. and Senyo, K. and Sevior, M. E. and Shapkin,
                      M. and Shiu, J.-G. and Shwartz, B. and Sokolov, A. and
                      Solovieva, E. and Starič, M. and Stottler, Z. S. and
                      Strube, J. F. and Sumiyoshi, T. and Sutcliffe, W. and
                      Takizawa, M. and Tanida, K. and Tenchini, F. and Uchida, M.
                      and Uglov, T. and Uno, S. and Urquijo, P. and Vahsen, S. E.
                      and Van Tonder, R. and Varner, G. and Varvell, K. E. and
                      Wang, C. H. and Wang, E. and Wang, M.-Z. and Wang, P. and
                      Wang, X. L. and Watanabe, M. and Won, E. and Xu, X. and Yan,
                      W. and Yang, S. B. and Ye, H. and Yusa, Y. and Zhang, Z. P.
                      and Zhilich, V. and Zhukova, V.},
      collaboration = {{Belle Collaboration}},
      title        = {{M}easurement of the {B}ranching {F}raction of the {D}ecay
                      $\boldsymbol{{B}^{+}\to\pi^{+}\pi^{-}\ell^{+}\nu_\ell}$ in
                      {F}ully {R}econstructed {E}vents at {B}elle},
      reportid     = {PUBDB-2020-03126, arXiv:2005.07766. Belle preprint 2020-06.
                      KEK preprint 2020-04},
      pages        = {1-23},
      year         = {2020},
      note         = {23 pages, 19 figures},
      abstract     = {We present an analysis of the exclusive
                      $B^{+}\to\pi^{+}\pi^{-}\ell^{+}\nu_{\ell}$ decay, where
                      $\ell$ represents an electron or a muon, with the assumption
                      of charge-conjugation symmetry and lepton universality. The
                      analysis uses the full $\Upsilon(4S)$ data sample collected
                      by the Belle detector, corresponding to 711 fb$^{-1}$ of
                      integrated luminosity. We select the events by fully
                      reconstructing one $B$ meson in hadronic decay modes,
                      subsequently determining the properties of the other $B$
                      meson. We extract the signal yields using a binned
                      maximum-likelihood fit to the missing-mass squared
                      distribution in bins of the invariant mass of the two pions
                      or the momentum transfer squared. We measure a total
                      branching fraction of ${{\cal B}(B^{+}\to
                      \pi^{+}\pi^{-}\ell^{+}\nu_{\ell})= [22.7 ^{+1.9}_{-1.6}
                      (\mathrm{stat}) \pm 3.4(\mathrm{syst}) ]\times 10^{-5}}$,
                      where the uncertainties are statistical and systematic,
                      respectively. This result is the first reported measurement
                      of this decay.},
      keywords     = {electron positron: annihilation (INSPIRE) / electron
                      positron: colliding beams (INSPIRE) / B: pair production
                      (INSPIRE) / B: semileptonic decay (INSPIRE) / charge
                      conjugation: symmetry (INSPIRE) / lepton: universality
                      (INSPIRE) / B+: branching ratio: measured (INSPIRE) / BELLE
                      (INSPIRE) / KEK-B (INSPIRE) / mass spectrum: (pi+ pi-)
                      (INSPIRE) / momentum transfer dependence (INSPIRE) / mass
                      dependence (INSPIRE) / Upsilon(10570) (INSPIRE) / B:
                      hadronic decay (INSPIRE) / missing-mass (INSPIRE) / B: decay
                      modes (INSPIRE) / statistical (INSPIRE) / two-pion (INSPIRE)
                      / electron (INSPIRE) / muon (INSPIRE) / statistical analysis
                      (INSPIRE) / data analysis method (INSPIRE) / experimental
                      results (INSPIRE) / B+ --> pi+ pi- positron neutrino/e
                      (INSPIRE) / B+ --> pi+ pi- muon+ neutrino/mu (INSPIRE)},
      cin          = {Belle},
      cid          = {I:(DE-H253)Belle-20160426},
      pnm          = {611 - Fundamental Particles and Forces (POF3-611)},
      pid          = {G:(DE-HGF)POF3-611},
      experiment   = {EXP:(DE-H253)BELLE-20150101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2005.07766},
      howpublished = {arXiv:2005.07766},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2005.07766;\%\%$},
      doi          = {10.3204/PUBDB-2020-03126},
      url          = {https://bib-pubdb1.desy.de/record/442590},
}