Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Form factors for semileptonic, nonleptonic and rare $B\, (B_s)$ meson
  decays   We provide new values for the model parameters of the covariant constituent
quark model (with built--in infrared confinement) in the meson sector by a fit
to the leptonic decay constants and a number of electromagnetic decays. We then
evaluate, in a parameter free way, the form factors of the $B(B_s)\to
P(V)$-transitions in the full kinematical region of momentum transfer. As an
application of our results we calculate the widths of the nonleptonic
$B_s$-decays into $D_s^- D_s^+,$ $D_s^{\ast\,-} D_s^{+}+D_s^- D_s^{\ast\,+}$
and $D_s^{\ast\,-} D_s^{\ast\,+}$. These modes give the largest contribution to
$\Delta\Gamma$ for the $B_s-\bar B_s$ system. We also treat the nonleptonic
decay $B_{s}\to\Jpsi\phi$. Although this mode is color suppressed this decay
has important implications for the search of possible CP-violating New Physics
effects in $B_s-\bar B_s$ mixing.

31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph