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| Home > Publications database > Measurement of the Branching Fraction of the Decay $\boldsymbol{B^{+}\to\pi^{+}\pi^{-}\ell^{+}\nu_\ell}$ in Fully Reconstructed Events at Belle |
| Preprint | PUBDB-2020-03126 |
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2020
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Please use a persistent id in citations: doi:10.3204/PUBDB-2020-03126
Report No.: Belle preprint 2020-06; KEK preprint 2020-04; arXiv:2005.07766
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.
Keyword(s): electron positron: annihilation ; electron positron: colliding beams ; B: pair production ; B: semileptonic decay ; charge conjugation: symmetry ; lepton: universality ; B+: branching ratio: measured ; BELLE ; KEK-B ; mass spectrum: (pi+ pi-) ; momentum transfer dependence ; mass dependence ; Upsilon(10570) ; B: hadronic decay ; missing-mass ; B: decay modes ; statistical ; two-pion ; electron ; muon ; statistical analysis ; data analysis method ; experimental results ; B+ --> pi+ pi- positron neutrino/e ; B+ --> pi+ pi- muon+ neutrino/mu
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Journal Article
Measurement of the branching fraction of the decay $\boldsymbol{B^{+}\to\pi^{+}\pi^{-}\ell^{+}\nu_\ell}$ in fully reconstructed events at Belle
Physical review / D 103(11), 112001 (2021) [10.1103/PhysRevD.103.112001]
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