Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: CLAS12 and its initial Science Program at the Jefferson Lab Upgrade   An overview of the CLAS12 detector is presented and the initial physics
program after the energy-doubling of the Jefferson Lab electron accelerator.
Construction of the 12 GeV upgrade project has started October 2008. A broad
program has been developed to map the nucleon's 3-dimensional spin and flavor
content through the measurement of deeply exclusive and semi-inclusive
processes. Other programs include forward distribution function to large $x_{B}
\le 0.85$ and of the quark and gluon polarized distribution functions, as well
as nucleon ground state and transition form factors at high $Q^2$. The 12 GeV
electron beam and the large acceptance of CLAS12 are also well suited to
explore hadronization properties using the nucleus as a laboratory

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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-th
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The categories of this paper are: q-alg
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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: physics
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The categories of this paper are: ao-sci
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an