Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the CKM angle alpha/phi2 with B -> rho rho decays at
  Belle and BABAR   We overview recent measurements in B -> rho rho decays which are based on
data samples collected at the PEP-II and KEKB asymmetric-energy e+e- colliders
with the BABAR and Belle detectors. Special emphasis is given to the
determination of the CP-violating coefficients A and S from an analysis of B ->
rho+ rho- decays. The values of A and S, branching fractions, and longitudinal
polarization fractions of B -> rho rho decays are used to constrain the
Cabibbo-Kobayashi-Maskawa phase alpha/phi2 using an isospin analysis; the
solution consistent with the standard model is 71 deg. < alpha < 113 deg. at 68
C.L.

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The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: econ
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The categories of this paper are: plasm-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
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The categories of this paper are: stat
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc