Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Long-distance contribution to exclusive rare decays of heavy mesons in
  quark model   Nonperturbative effects in exclusive reactions $B\to K^{(*)}ll$ are
discussed. Form factors which describe the main long-distance contribution to
the meson transition amplitude are calculated within the dispersion formulation
of the quark model: namely, the form factors in the decay region are expressed
as relativistic double spectral representations through the wave functions of
the initial and final mesons. The dilepton forward-backward asymmetry and the
lepton polarization turn out to be largely independent of the particular choice
of the quark model parameters and can be predicted with high accuracy. At the
same time, these asymmetries are sensitive to the short-distance structure of
the theory and might be used as a test of the Standard Model and probe of new
physics.

10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th