Phi Decay Experiment(KEKPS E325) Home Page
We measure phi-meson decays in nuclear media, both in the mesonic and leptonic
decay mode. By observing both decay modes simultaneously and by examining
a possible change of the branching ratio , mass shift of K and phi in
nuclear media will be studied. The phinomena can be interpreted as a
consequence of the partial restoration of the chiral symmetry
in nuclear media.
We started the R&D of the experiment in 1994.
The spectrometer was built in the EP1B primary beamline at KEK-PS in 1996-97.
Physics run were performed 1997-2002, and spectrometer was
decomposed in 2003 Apr.
First physics result shows the modification of rho/omega meson
are publised as
High statistics run were performed in 2001/2002(6th/7th run).
The result of rho/omega -> ee decay channel is published in
The cross section of omega/phi in the ee decay channel is published in
The result of phi -> ee channel is published in
The result of phi -> KK channel is published in
- First physics run (970515-0619).
- (phi->KK only)
- Second run (9805)
- (phi->KK and phi->ee simultaneously)
- Third run (9907)
- 4th run (000622-0707)
- 5th run (0012)
- 6th run (011114-1223)
- 7th (the last) run (0202)
- enyo -at- riken.go.jp(spokesperson)
Last modified: Fri Jul 16 22:03:32 2010