Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of exclusive two-body B0 meson decays to charmonium   We present a study of three B0 decay modes useful for time-dependent CP
asymmetry measurements. From a sample of 9.7 million B meson pairs collected
with the CLEO detector, we have reconstructed B0 -> J/psi K0S, B0 -> chi_c1
K0S, and B0 -> J/psi pi0 decays. The latter two decay modes have been observed
for the first time. We describe a K0S -> pi0 pi0 detection technique and its
application to the reconstruction of the decay B0 -> J/psi K0S. Combining the
results obtained using K0S -> pi+ pi- and K0S -> pi0 pi0 decays, we determine
Br(B0 -> J/psi K0) = (9.5 +- 0.8 +- 0.6)*10^-4, where the first uncertainty is
statistical and the second one is systematic.
  We also obtain Br(B0 -> chi_c1 K0)= (3.9 +1.9/-1.3 +- 0.4)*10^-4 and Br(B0 ->
J/psi pi0) = (2.5 +1.1/-0.9 +- 0.2)*10^-5.

20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph