Measurements of branching fractions and $q^2$ distributions for $B\to \pi \ell \nu$ and $B\to \rho \ell \nu$ Decays with $B\to D^{(\ast )}\ell \nu$ Decay Tagging

Abstract

We report measurements of the charmless semileptonic decays $B^0\to {\pi }^{-}/{\rho }^{-}{\ell }^{+}\nu$ and $B^{+}\to {\pi }^0/{\rho }^0{\ell }^{+}\nu$, based on a sample of $2.75\times 10^8$ $B\bar{B}$ events collected at the ${\rm Y}(4S)$ resonance with the Belle detector at the KEKB $e^{+}{e}^{-}$ asymmetric collider. In this analysis, the accompanying $B$ meson is reconstructed in the semileptonic mode $B\to D^{(\ast )}\ell \nu$, enabling detection of the signal modes with high purity. We measure the branching fractions $\mathcal{B}(B^0\to {\pi }^{-}{\ell }^{+}\nu )=(1.38\pm 0.19\pm 0.14\pm 0.03)\times 10^{-4}$, $\mathcal{B}(B^0\to {\rho }^{-}{\ell }^{+}\nu )=(2.17\pm 0.54\pm 0.31\pm 0.08)\times 10^{-4}$, $\mathcal{B}(B^{+}\to {\pi }^0{\ell }^{+}\nu )=(0.77\pm 0.14\pm 0.08\pm 0.00)\times 10^{-4}$ and $\mathcal{B}(B^{+}\to {\rho }^0{\ell }^{+}\nu )=(1.33\pm 0.23\pm 0.17\pm 0.05)\times 10^{-4}$, where the errors are statistical, experimental systematic, and systematic due to form-factor uncertainties, respectively. For each mode we also present the partial branching fractions in three $q^2$ intervals: $q^2<8$, $8\le q^2<16$, and $q^2\ge 16$ GeV${}^2/c^2$. From our partial branching fractions for $B\to \pi \ell \nu$ and recent results for the form factor from unquenched Lattice QCD calculations, we obtain values of the CKM matrix element $|V_{ub}|$.

19 pages, 5 figures, 6 tables, submitted to Phys. Lett. B

References in corpus (1)

• B Meson Semileptonic Form Factors from Unquenched Lattice QCD

Cited by in corpus (40)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Model-independent description of $B\to \pi l\nu$ decays and a determination of $|V_{ub}|$
• Flavor Physics in the Quark Sector
• Study of B --> pi l nu and B --> rho l nu Decays and Determination of |V_ub|
• Study of Exclusive B->X_u l nu Decays and Extraction of |V_{ub}| using Full Reconstruction Tagging at the Belle Experiment
• Measurement of the decay $B^0\to {\pi }^{-}{\ell }^{+}\nu$ and determination of $|V_{ub}|$
• The semileptonic decays $B/B_s\to (\pi ,K)(l^{+}{l}^{-},l\nu ,\nu \bar{\nu })$ in the perturbative QCD approach beyond the leading-order
• An Improved Standard Model Prediction Of BR(B -> tau nu) And Its Implications For New Physics
• New Physics at a Super Flavor Factory
• A Study of Exclusive Charmless Semileptonic B Decay and |V_ub|
• |V_ub| from UTangles and B->pi l nu
• Hard Pion Chiral Perturbation Theory for $B\to \pi$ and $D\to \pi$ Formfactors
• Measurement of the B^0 --> pi^-ell^+nu and B^+ --> eta^(')ell^+nu Branching Fractions, the B^0 --> pi^-ell^+nu and B^+ --> eta ell^+nu Form-Factor Shapes, and Determination of |V_{ub}|
• B- -> pi- pi0/rho- rho0 to NNLO in QCD factorization
• Updated Measurement of the Strong Phase in D0 --> K+pi- Decay Using Quantum Correlations in e+e- --> D0 D0bar at CLEO
• Vector Formfactors in Hard Pion Chiral Perturbation Theory
• Semileptonic decays and $|V_{xb}|$ determinations
• Semileptonic decays $B/B_s \to (η,\etar, G)(l^+l^-,l\barν,ν\barν)$ in the perturbative QCD approach beyond the leading order
• Measurements of B --> {pi, eta, eta'} l nu Branching Fractions and Determination of |Vub| with Semileptonically Tagged B Mesons
• |Vub| from exclusive semileptonic B to pi decays revisited
• Moving NRQCD for heavy-to-light form factors on the lattice
• B Meson Decays
• A Study of Exclusive Charmless Semileptonic B Decays and Extraction of |V_{ub}| at CLEO
• Semileptonic and leptonic $B$ decays, circa 2016
• Form factor ratios for $B_s\to K\ell \nu$ and $B_s\to D_s\ell \nu$ semileptonic decays and $|V_{ub}/V_{cb}|$
• |Vub| from Exclusive Semileptonic B--> rho Decays
• Study of the exclusive $b\to u{\ell }^{-}{\bar{\nu }}_{\ell }$ decays in the MSSM with and without R-parity violation
• Measuring V_ub and probing SUSY with double ratios of purely leptonic decays of B and D mesons
• Impact of vector new physics couplings on $B_s\to (K,K^{\ast })\tau \nu$ and $B\to \pi \tau \nu$ decays
• Measurement of the Branching Fraction of the Decay ${\mathbf{B}}^{+}\to {\mathbf{\pi }}^{+}{\mathbf{\pi }}^{-}{\mathbf{\ell }}^{+}{\mathbf{\nu }}_{\mathbf{\ell }}$ in Fully Reconstructed Events at Belle
• Determination of the strong coupling $g_{B^{\ast }B\pi }$ from semi-leptonic $B\to \pi \ell \nu$ decay
• Heavy-to-light scalar form factors from Muskhelishvili-Omnès dispersion relations
• $B\to \rho$ semileptonic decays and $|V_{ub}|$
• Evaluation of CKM matrix elements from exclusive $P_{\ell 4}$ decays
• Radiative corrections of $O(\alpha )$ to $B^{-}\to V^0{\ell }^{-}{\bar{\nu }}_{\ell }$ decays
• Exploring the exclusive decay $B^{+}\to \omega {\ell }^{+}\nu$ with light-cone sum rules
• Tensions in the flavour sector
• Semileptonic $B_s\to D_{s2}^{\ast }(2573)\ell {\bar{\nu }}_{\ell }$ transition in QCD