Measurements of the B to D* Form Factors Using the Decay B0 --> D* e nu_e

Abstract

We measure the dependence of ${\bar{B}}^0\to D^{\ast +}{e}^{-}{\bar{\nu }}_e$ on the decay angles and momentum transfer. The data sample consists of $\sim 86\times 10^6$ $B\bar{B}$-pairs accumulated on the ${\rm Y}(4\mathrm{S})$ resonance by the BABAR detector at the asymmetric $e^{+}{e}^{-}$ collider PEP-II. We specify the three form factors by two ratios $R_1$ and $R_2$, and by a single parameter ${\rho }^2$ characterizing the polynomial representing $h_{A_1}$, the function which describes the momentum-transfer dependence of the form factor $A_1$. We determine $R_1$, $R_2$, and ${\rho }^2$ using an unbinned maximum likelihood fit to the full decay distribution. The results are $R_1=1.396\pm 0.060\pm 0.035\pm 0.027$, $R_2=0.885\pm 0.040\pm 0.022\pm 0.013$, and ${\rho }^2=1.145\pm 0.059\pm 0.030\pm 0.035$. The stated uncertainties are the statistical from the data, statistical from the size of the Monte Carlo sample and the systematic uncertainty, respectively. In addition, based on this measurement, we give an updated value for the CKM matrix element $|V_{cb}|$.

35 pgs, 20 figures. Submitted to Phys Rev D

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• New Physics at a Super Flavor Factory
• Measurement of the B0 --> pi l nu Form-Factor Shape and Branching Fraction, and Determination of |Vub| with a Loose Neutrino Reconstruction Technique
• Moments of the Hadronic Invariant Mass Spectrum in B --> X_c l nu Decays at Belle
• Determination of the Form Factors for the Decay B0 -> D*- l+ nu_l and of the CKM Matrix Element |V_cb|
• Moments of the electron energy spectrum and partial branching fraction of $B\to X_{c}e\nu$ decays at Belle
• New analysis of semileptonic B decays in the relativistic quark model
• Memorino on the `1/2 vs. 3/2 Puzzle' in $\bar{B}\to l\bar{\nu }{X}_c$ -- a Year Later and a Bit Wiser
• 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}|
• Semileptonic $B_q\to D_q^{\ast }l\nu$ $(q=s,d,u)$ Decays in QCD Sum Rules
• B Meson Decays
• Measurement of the Semileptonic Decays B --> D tau- nubar_tau and B --> D* tau- nubar_tau
• Determination of $|V_{cb}|$ using ${\overline{B}}^0\to D^{\ast +}{\ell }^{-}{\bar{\nu }}_{\ell }$ decays with Belle II
• Study of $D^{\ast \ast }$ production and light hadronic states in the ${\bar{B}}^0\to D^{\ast +}\omega {\pi }^{-}$ decay
• Determination of $|V_{cb}|$ using $B\to D\ell {\nu }_{\ell }$ Decays at Belle II
• Recent results on semileptonic decays at Babar