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 PRL86(2001)5019-5022.
Now we are in the last stage of the data analysis, using high statistics data
taken in 2001/2002(6th/7th run). The result of rho/omega -> ee decay channel
is reported in nucl-ex/0504016 and submitted.
The result of phi -> ee channel will be presented at coming QM2005. The
analysis for phi -> KK channel is also on going and will be presented
in JPS 2005 HAWAII.
- 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)
- email@example.com(responsible for this homepage)
Last modified: Thu Jul 21 16:00:00 JST 2005