Hyperon Scattering Experiments with a New Tracking Detector “SCITIC”

概要

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A new tracking detector, scintillating track image camera (SCITIC) was used for hyperon-scattering experiments. Since the hyperon lifetimes are short, the low-energy hyperon-nucleon scattering can be studied only with a track detector used as an active target. The present experiment has shown that the SCITIC is a promising detector for the hyperon scattering experiments. Polarized hyperons $\Sigma^{+}$ were produced through $\mathrm{p}(\pi^{+}, \mathrm{K}^{+})\Sigma^{+}$ reactions with a 1.6 GeV/c pion beam on a liquid scintillator of the active target. Three sets of SCITIC were used to record the pictures of $\Sigma^{+}$ production and scattering. A kaon spectrometer was used to trigger the SCITIC with a signal of kaon from the reaction. Left/right asymmetries of the $\Sigma^{+}$p scattering were determined through analyses of the pictorial data, and the results were in accordance with a quark-model prediction that the asymmetry was large in the $\Sigma^{+}$p scattering while it was small in the $\Lambda$N case.
2004-04-15