Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Revisiting $B\to D \ell \nu$   We re-examine the determination of $|V_{cb}|$ from $B\to D \ell \nu$ in view
of recent experimental and theoretical progress, discussing the
parameterization of the form factors and studying the role played by the
unitarity constraints. Our fit to experimental and lattice results for $B\to D
\ell \nu$ gives $|V_{cb}|=40.49(97)\ 10^{-3}$ and to $R(D)= 0.299(3)$.

36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an