1. Simulations and feasibility studies of low mass vector mesons identification in CBM Jerzy Cibor 1 Rados ł aw Karabowicz 2 Zbigniew Majka 2 Pawe ł Staszel 2 Pawe ł Szostak 2 1.H. Niewodniczanski Institute Of Nuclear Physics, Krakow, Poland 2.M. Smoluchowski Institute Of Physics, Jagiellonian University, Krakow, Poland

2. Organization of the software UrQMD Au+Au @25AGeV central after 40 fm/c Pluto fireball Geant Standard G4CBM setup: -magnet (zero field) -target 2x2 cm 2 x 300 m -carbon pipe, 0.5 mm thick -7 STStations, 100 m thick background (9000 events) -particle multiplicities -rapidity and anisotropy distributions signal (10 6 events) RESULTS Jerzy Cibor, IFJ Krakow CBM meeting, GSI Darmstadt 18.10.2003

3. UrQMD particle multiplicities and distributions Particle multiplicities: N ALL = 1582 N CH = 944 N p = 161 N pbar = 0.154 N + = 338 N - = 369 N K+ = 42.4 N K- = 13.6 N = 37.4 Jerzy Cibor, IFJ Krakow CBM meeting, GSI Darmstadt 18.10.2003 y ptpt

4. UrQMD hit densities in STS Jerzy Cibor, IFJ Krakow CBM meeting, GSI Darmstadt 18.10.2003 1243 567

5. Signal from Pluto Jerzy Cibor, IFJ Krakow CBM meeting, GSI Darmstadt 18.10.2003 after Geant

6. UrQMD + Geant vertices distribution Jerzy Cibor, IFJ Krakow CBM meeting, GSI Darmstadt 18.10.2003

7. Background from UrQMD and cuts applied Jerzy Cibor, IFJ Krakow CBM meeting, GSI Darmstadt 18.10.2003 dN e+e- /dM e+e-

8. Latest results of combinatorial background subtraction Jerzy Cibor, IFJ Krakow CBM meeting, GSI Darmstadt 18.10.2003 dN e+e- /dM e+e-

9. Future plans - more statistics (?) - investigation and optimization of different cuts - magnetic field + tracking - realistic detector – efficiencies, misidentifications - next results will be presented in Warsaw 24.11.2003 Jerzy Cibor, IFJ Krakow CBM meeting, GSI Darmstadt 18.10.2003