Simulations and feasibility studies of low mass vector mesons

identification in CBM

Jerzy Cibor1

Radosław Karabowicz2

Zbigniew Majka2

Paweł Staszel2

Paweł Szostak2

1. H. Niewodniczanski Institute Of Nuclear Physics, Krakow, Poland2. M. Smoluchowski Institute Of Physics, Jagiellonian University, Krakow, Poland

Organization of the software

UrQMDAu+Au @25AGeV

centralafter 40 fm/c

Plutofireball

GeantStandard G4CBM setup:

-magnet (zero field)-target 2x2 cm2 x 300 m

-carbon pipe, 0.5 mm thick-7 STStations, 100 m thick

background(9000 events)

-particle multiplicities

-rapidity and anisotropy distributions

signal(106 events)

RESULTS

Jerzy Cibor, IFJ Krakow CBM meeting, GSI Darmstadt 18.10.2003

UrQMDparticle multiplicities and distributions

Particle multiplicities:NALL = 1582NCH = 944

Np = 161 Npbar = 0.154N+ = 338 N- = 369NK+ = 42.4 NK- = 13.6

N = 37.4

Jerzy Cibor, IFJ Krakow CBM meeting, GSI Darmstadt 18.10.2003

y pt

UrQMDhit densities in STS

Jerzy Cibor, IFJ Krakow CBM meeting, GSI Darmstadt 18.10.2003

1 2 43

5 6 7

Signal from Pluto

Jerzy Cibor, IFJ Krakow CBM meeting, GSI Darmstadt 18.10.2003

after Geant

UrQMD + Geantvertices distribution

Jerzy Cibor, IFJ Krakow CBM meeting, GSI Darmstadt 18.10.2003

Background from UrQMDand cuts applied

Jerzy Cibor, IFJ Krakow CBM meeting, GSI Darmstadt 18.10.2003

dN

e+

e-/d

Me+

e-

Latest results ofcombinatorial background subtraction

Jerzy Cibor, IFJ Krakow CBM meeting, GSI Darmstadt 18.10.2003

dN

e+

e-/d

Me+

e-

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