We present an analysis of the exclusive B+→π+π−ℓ+νℓ decay, where ℓ represents an electron or a muon, with the assumption of charge-conjugation symmetry and lepton universality. The analysis uses the full Υ(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 B(B+→π+π−ℓ+νℓ)=[22.7(+1.9/−1.6)(stat)±3.5(syst)]×10^−5, where the uncertainties are statistical and systematic, respectively. This result is the first reported measurement of this decay.
Measurement of the Branching Fraction of the Decay B⁺→π⁺π⁻ℓ⁺νℓ in Fully Reconstructed Events at Belle
Tenchini, F.;
2021-01-01
Abstract
We present an analysis of the exclusive B+→π+π−ℓ+νℓ decay, where ℓ represents an electron or a muon, with the assumption of charge-conjugation symmetry and lepton universality. The analysis uses the full Υ(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 B(B+→π+π−ℓ+νℓ)=[22.7(+1.9/−1.6)(stat)±3.5(syst)]×10^−5, where the uncertainties are statistical and systematic, respectively. This result is the first reported measurement of this decay.File | Dimensione | Formato | |
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