Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: B Decays - Measurements and Predictions   Hadronic decays of $B$ mesons are reviewed. First, masses of $B$ mesons and
observed patterns together with physics behind them are discussed. Then the
effective Hamiltonian responsible for major decays is presented and its
practical applications are discussed in the context of factorization. Various
tests of factorization are then studied. For rare decays, the focus is placed
on $K\pi$, $\pi\pi$ final state and the penguin-mediated $X_s\gamma$. In
general, the measurements are in excellent agreement with predictions of the
standard model.

25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ