Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exclusive weak B decays involving $\tau$ lepton in the relativistic
  quark model   Semileptonic and leptonic B decays are analyzed in the framework of the
relativistic quark model. Special attention is payed to the decays involving
$\tau$ lepton. It is found that the calculated particular decay branching
fractions are consistent with available experimental data within error bars.
However, the predicted and recently measured ratios $R(D^{(*)})$ of the $B\to
D^{(*)}\tau\nu_\tau$ and $B\to D^{(*)}l\nu_l$ branching fractions differ by
1.75$\sigma$ for $R(D)$ and by 2.4$\sigma$ for $R(D^*)$.

37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess