Kavli Affiliate: D. B. Macfarlane
| Summary:
Using the entire BaBar $Υ(4S)$ data set, the first two-dimensional unbinned angular analysis of the semileptonic decay $overlineB rightarrow D ell^- overlineν_ell$ is performed, employing hadronic reconstruction of the tag-side $B$ meson from $Υ(4S)to BoverlineB$. Here, $ell$ denotes the light charged leptons $e$ and $μ$. A novel data-driven signal-background separation procedure with minimal dependence on simulation is developed. This procedure preserves all multi-dimensional correlations present in the data. The expected $sin^2θ_ell$ dependence of the differential decay rate in the Standard Model is demonstrated, where $θ_ell$ is the lepton helicity angle. Including input from the latest lattice QCD calculations and previously available experimental data, the underlying form factors are extracted using both model-independent (BGL) and dependent (CLN) methods. Comparisons with lattice calculations show flavor SU(3) symmetry to be a good approximation in the $B_(s)to D_(s)$ sector. Using the BGL results, the CKM matrix element $|V_cb|=(41.09pm 1.16)times 10^-3$ and the Standard Model prediction of the lepton-flavor universality violation variable $mathcalR(D)=0.300pm 0.004$, are extracted. The value of $|V_cb|$ from $overlineB rightarrow D ell^- overlineν_ell$ tends to be higher than that extracted using $overlineB rightarrow D ell^- overlineν_ell$. The Standard Model $mathcalR(D)$ calculation is at a $1.97σ$ tension with the latest HFLAV experimental average.
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