Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome timezone

Angular analysis of $B\to D^{(*)} \ell \nu$ with hadronic tagging at $BABAR$.

Jul 8, 2022, 5:17 PM
Room 9 (Indaco)

Room 9 (Indaco)

Parallel Talk Quark and Lepton Flavour Physics Quark and Lepton Flavour Physics


Biplab Dey (Eotvos U.)


Employing the full $BABAR$ dataset we extract form-factors for $\overline{B}\to D^{(\ast)}\ell^m \overline{\nu}_\ell$ using the hadronic tagging method. For $\overline{B}\to D\ell^m \overline{\nu}_\ell$, a two-dimensional angular analysis is performed in both $q^2$ and the lepton helicity angle. The two $B\to D$ form factors are determined using a joint fit with available lattice data. This enables checking flavor SU3 relations using comparisons with HPQCD $B_s\to D_s$ form-factors. An updated value of $V_{cb}$ from $B\to D$ is also extracted. The $B\to D^\ast$ form-factor fits in the BABAR-19 publication [PRL123 (2019) 9, 091801] are updated, using newly available $w>1$ lattice data (MILC/FNAL, HPQCD, JLQCD). The $BABAR$+lattice results are compared with the $BABAR$-only fits in BABAR-19. Finally, a combined $B\to D^{(\ast)}$ fit using the full $BABAR$ data and a HQET parametrization with higher order corrections in $1/m_{b,c}$ are described.

In-person participation No

Primary author

Biplab Dey (Eotvos U.)

Presentation materials