Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of alpha/phi2 in Bo --> pi pi, rho pi and rho rho   We present a summary of the measurements of the CKM angle, alpha (phi2),
performed by the BaBar and Belle experiments which collect BBbar pairs at the
Y(4S) resonance produced in asymmetric e+ e- collisions. We discuss the
measurements of the branching fractions and CP asymmetries in the B --> pi pi,
rho pi and rho rho final states that lead to constraints on alpha (phi2).

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The categories of this paper are: adap-org
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: solv-int
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The categories of this paper are: cs