Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the CKM Matrix Element |Vub| with B->rho e nu Decays   We present a measurement of the branching fraction for the rare decays B->rho
e nu and extract a value for the magnitude of Vub, one of the smallest elements
of the Cabibbo-Kobayashi-Maskawa quark-mixing matrix. The results are given for
five different calculations of form factors used to parametrize the hadronic
current in semileptonic decays. Using a sample of 55 million BBbar meson pairs
recorded with the BABAR detector at the PEP-II e+e- storage ring, we obtain
Br(B0->rho- e+ nu)=(3.29 +-0.42 +-0.47 +-0.60) x 10^-4 and |Vub|=(3.64 +-0.22
+-0.25 +0.39-0.56)x10^-3, where the uncertainties are statistical, systematic,
and theoretical, respectively.

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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: acc-phys
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: econ
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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: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th