Experiments at the DA Phi NE phi-factory

Physica Scripta(2003)

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摘要
The Frascati e(+)e(-) collider, DAPhiNE, operates at a center of mass energy of similar to 1020MeV, the mass of the phi-meson. Three detectors have been realized, KLOE, DEAR, and FINUDA. The first two are presently collecting data in the two DAPhiNE interaction regions (IR), while the third is being assembled in its pit inside the DAPhiNE hall and will take data in the IR occupied by DEAR. The KLOE experiment, which is designed to measure CP and CPT violation parameters in the KSKL system, has collected so far similar to300 pb(-1). Measurements obtained using the year 2000 data sample will be presented, which are focussed on K-S physics and phi radiative decays. The DEAR experiment aims at studying the scattering lengths of the kaon-nucleon system, through a precise measurement of the K-alpha line shifts in kaonic hydrogen and kaonic deuterium. With 2001 and 2002 data-taking periods the DEAR collaboration has demonstrated the capability of creating and detecting exotic atoms using the kaon flux from DAPhiNE, by measuring the X-ray spectrum of kaonic nitrogen. The present status and perspectives of the DEAR experiment will be discussed. A brief report will be given at the end on the FINUDA physics program, aiming at the study of the Lambda-hypernuclei levels and lifetimes.
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关键词
nitrogen,center of mass,spectrum
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