Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of the Decay $\Lambda_c \to \Lambda l^+ \nu_{l}   Using the CLEO II detector at CESR, we observe 500 $\Lambda l^+$ pairs
consistent with the semileptonic decay $\Lambda_c \to \Lambda l^+ \nu_{l}$. We
measure $\sigma (e^+ e^- \to \Lambda_c X) \dot {cal B}(\Lambda_c^+ \to \Lambda
l \nu_{l}) =4.77 \pm 0.25 \pm 0.66 $pb. Combining with the charm semileptonic
width and the lifetime of the $\Lambda_c$, we also obtain ${\cal B}(\Lambda_c
\to p K^- \pi^+)$. We find no evidence for $\Lambda l^+ \nu_{l}$ final states
in which there are additional $\Lambda_c^+$ decay products. We measure the
decay asymmetry parameter of $\Lambda_c \to \Lambda l^+ \nu_{l}$ to be
$\alpha_{\Lambda_c} =-0.89\pm{^{0.17}_{0.11}}\pm{^{0.09}_{0.06}}.

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The categories of this paper are: econ
31
The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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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: cond-mat
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The categories of this paper are: astro-ph
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The categories of this paper are: plasm-ph