DAFNE

This article is about the Italian electron–positron collider. For the French collider DAPHNE, see Détecteur à Grande Acceptance pour la Physique Photonucléaire Expérimentale. For other uses, see Dafne (disambiguation).

DAFNE or DAΦNE (Double Annular Φ Factory for Nice Experiments), is an electron-positron collider at the INFN Frascati National Laboratory in Frascati, Italy. Since 1999 it has been colliding electrons and positrons at a center of mass energy of 1.02 GeV to create phi mesons (φ). 85% of these decay into kaons (K), whose physics is the subject of most of the experiments at DAFNE.

There are five experiments at DAFNE:

• KLOE (K LOng Experiment), which has been studying CP violation in kaon decays and rare kaon decays since 2000. This is the largest of DAFNE experiments.
• FINUDA (FIsica NUcleare a DAFNE), studies the spectra and nonmesonic decays of hypernuclei containing Lambda baryons (Λ). The hypernuclei are produced by negatively charged kaons (
  K⁻
  ) striking a thin target.
• DEAR (DAFNE Exotic Atoms Research experiment), determines scattering lengths in atoms made from a kaon and a proton or deuteron.
• DAFNE Light Laboratory consists of 3 lines of synchrotron radiation emitted by DAFNE, a fourth is under construction.
• SIDDHARTA (SIlicon Drift Detectors for Hadronic Atom Research by Timing Application), aims to improve the precision measurements of X-ray transitions in kaon atoms studied at DEAR.

External links

• Homepage of the accelerator division of Frascati National Laboratory: public (Italian), technical