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• W4376123283 abstract "We report measurements of the ratios of branching fractions for $B to bar{D}^{(*)}piell^+nu_ell$ and $B to bar{D}^{(*)}pi^+pi^-ell^+nu_ell$ relative to $B to bar{D}^*ell^+nu_ell$ decays with $ell = e, mu$. These results are obtained from a data sample that contains $772 times 10^6 Bbar{B}$ pairs collected near the $Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. Fully reconstructing both $B$ mesons in the event, we obtain begin{align*} frac{B(B^0 to bar{D}^0pi^-ell^+nu_ell)}{B(B^0 to D^{*-}ell^+nu_ell)} &= (7.24pm0.36pm0.12)% , frac{B(B^+ to D^-pi^+ell^+nu_ell)}{B(B^+ to bar{D}^{*0}ell^+nu_ell)} &= (6.78pm0.24pm0.15)% , frac{B(B^0 to bar{D}^{*0}pi^-ell^+nu_ell)}{B(B^0 to D^{*-}ell^+nu_ell)} &= (11.10pm0.48pm0.20)% , frac{B(B^+ to D^{*-}pi^+ell^+nu_ell)}{B(B^+ to bar{D}^{*0}ell^+nu_ell)} &= (9.50pm0.33pm0.27)% , frac{B(B^0 to D^-pi^+pi^-ell^+nu_ell)}{B(B^0 to D^{*-}ell^+nu_ell)} &= (2.91pm0.37pm0.25)% , frac{B(B^+ to bar{D}^0pi^+pi^-ell^+nu_ell)}{B(B^+ to bar{D}^{*0}ell^+nu_ell)} &= (3.10pm0.26pm0.21)% , frac{B(B^0 to D^{*-}pi^+pi^-ell^+nu_ell)}{B(B^0 to D^{*-}ell^+nu_ell)} &= (1.03pm0.43pm0.18)% , frac{B(B^+ to bar{D}^{*0}pi^+pi^-ell^+nu_ell)}{B(B^+ to bar{D}^{*0}ell^+nu_ell)} &= (1.25pm0.27pm0.15)% , end{align*} where the uncertainties are statistical and systematic, respectively. The invariant mass spectra of the $Dpi$, $D^*pi$, and $Dpipi$ systems are studied. Branching fraction products are extracted, among them the first observations of $B(B^0 to D_1^-ell^+nu_ell) times B(D_1^- to D^-pi^+pi^-) = (0.102pm0.013pm0.009)%$ and $B(B^+ to bar{D}_1^0ell^+nu_ell) times B(bar{D}_1^0 to bar{D}^0pi^+pi^-) = (0.105pm0.011pm0.008)%$." @default.
• W4376123283 created "2023-05-12" @default.
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