Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for B0->pi0pi0   We report evidence for the decay B0->pi0pi0. The analysis is based on a data
sample of 152million BBbar pairs collected at the Upsilon(4s) resonance with
the Belle detector at the KEKB e+e- storage ring. We find
25.6+9.3/-8.4(stat)+1.6/-1.4(syst) B0->pi0pi0 signal events with a significance
of 3.4 standard deviations. We measure the branching fraction to be
(1.7+-0.6(stat)+-0.2(syst))*10^{-6}.

17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci