simulations and feasibility studies of low mass vector mesons identification in cbm jerzy cibor 1...
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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