Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The B_s --> mu+mu- and B_d --> mu+mu- Decays: Standard Model and Beyond   I review the status of the rare decays B_s --> mu+mu- and B_d --> mu+mu-. The
latest Standard Model predictions for the corresponding branching ratios are
discussed. An overview of additional observables that are accessible in the B_s
--> mu+mu- decay is given. The new physics implications of the recent
measurement of the B_s --> mu+mu- branching ratio are discussed both model
independently and in the context of the Minimal Supersymmetric Standard Model.

11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn