Status of the PANDA Simulations

1
Status of the PANDA Simulations

• Event Generator UrQMD p A
• MVD Resolution
• Time of Flight
• Estimates of Data Rates
• Complete Analysis of pp?Y(3770)?DD
• Updated to-do list

2
Using UrQMD for pA (A.Galoyan)

• UrQMD OK but must be modified GaloyanPolanski
  hep-ph/0304196
• Multiplicity distribution Produced Particles
• p (7 GeV/c) Fe (10K events)

3
Phase Space Distribution

• All particles Q vs P Neutron dN/dQ

Q
4
MVD Resolution (A.Sokolov)

• Investigate MVD resolution with pp?4mm (8GeV)
• Take small angle scattering into account with a
  reduced weight for hits in outer layers
• Modify pad orientation
• 1st and 3rd 5th layers with pads ? to beam
• 2nd layer to beam direction
• Pad intrinsic resolution 12x70 mm
• Increase diameter of the the beam pipe

5
Vertex Resolution

• D0 radial distance
• Z0 longitudinal distance

polar angle Q
polar angle Q
polar angle Q
6
Increased Beam Pipe Diameter
7
Z0 Resolution, R40 mm Beam Pipe
sZ0 increases from 13 mm to 18 mm
8
Systematic Error in Z0
9
Momentum Resolution
mean resolution for pp?4m events at 8 GeV
10
Time of Flight (C.Schwarz)

• Kaon ID in the DIRC starts at about 600 MeV/c
• Can Reduce of DIRC PMTs with ToF
• Redundancy
• Fast trigger
• Resolution 100 ps
• Detector type RPC or scintillator?

11
TOP (Time of Propagation)
12
DIRC vs ToF
DIRC is needed for Pgt600 MeV/c and ToF for Plt600
MeV/c
13
Estimated Data Rates (P.SalaburaJR)

• Number of Readout Channels
• Mean Multiplicity
• Data per Event
• Event rate (107 Hz interactions)

14
Number of Readout Channels

• MVD 9.2x106 pixels
• STT 8.7x103 wires
• MDCT 1.7x103 wires
• DIRC 1.0x104 PMTs
• EMCT 7.5x103 crystals
• RICH 4.5x104 pads
• MuonT 3.2x104 cells
• ToFFS

15
(No Transcript)
16
(No Transcript)
17
Mean Multiplicities (pp 8 GeV/c)

• MVD 12 hits/evt x 2.5 pads/hit 30
• STT 94
• MDCT 37
• DIRC 7 bars/evt x 20 PMTs/hit x ½ 70
• EMCT 82
• RICH 1 hit/evt x 15 pads/hit 15
• MuonT 0.26
• ToFFS ???

18
Number of bits per Hit (rounded)

• MVD Layer(4)Coordinate(2x10)sysID(8) 32
• STT Layer(4)Wire(10)Time(2x10)sysID(8) 48
• MDCT Layer(4)Wire(8)Time(10)sysID(8) 32
• DIRC PMT(14)E(12)T(12)sysID(8) 48
• EMCT Crystal(13)E(15)sysID(8) 48
• RICH PadNumber(2x8)sysID(8) 24
• MuonT Cell(12)T(12) sysID(8) 32
• ToFFS

19
Total Data Rates (107 Hz)

• Detector bits/hit Multiplicity Total
  (GBytes/sec)
• MVD 32 30 1.2
• STT 48 94 5.6
• MDCT 32 37 1.5
• DIRC 48 70 4.2
• EMCT 48 82 5
• RICH 24 15 0.5
• MuonT 32 0.25 0.01
• ToFFS ?7?
• 25 GB/s

20
Analysis of pp?Y(3770)?DD (JR)

• Single D?Kpp Selector (BR9.1)
• pp?Y(3770)?DD
• Background Estimates
• report at GSI Docuserver
• http//www-new.gsi.de/onTEAM/tree/temp/1053448016/
  191053014637.ps

21
Vertex Resolution (1 D per event)
Force the decay at V(0.1,0.1,0.4) mm
PD3.3GeV/c Combine - - or - tracks (i.e. no
PID) for reconstruction M1865 sM7.3
MeV/c2 e 0.71
sZ22 mm
VR mm
VZ mm
22
Y(3770) ? DD ? KK-2p2p-
10,000 Events
M-- GeV
23
Decay Vertex Location
Transverse
Longitudinal
D mm
Z mm
Only longitudinal coordinate sensitive to
D-mesons !
24
Proper Lifetime Determination
N(x) exp - V M / (P ct)
ct 292 3 mm input 317 mm
VM/P
25
DD Kinematical Variables
Missing Mass Squared Invariant Mass
(Mmiss)2 GeV2
Minv GeV
N.B. (Mp)2 0.02 GeV2 e 31 (no
PID)
26
Fake D-Candidates from Background
80,000 Events
Vertex Z - Location
- - Inv. Mass
Vz mm
Minv GeV/c2
27
Background Suppression Factors
80,000 input background events 6.6 GeV/c 3,144
D-Candidates (no PID!) 196 events with Vz
gt 0.1 mm 100 events with c2/dof lt 10
(vertex fit) 0 events with a D D-
candidate estimate of remaining cuts by widening
cuts above 1/16000 for the second D
candidate 1/50 (Mmiss)2 lt 0.002 GeV2 1/10 Minv
?s
28
Peak to Background Ratio
Assume a Y(3770) formation cross section of 160
nb
L1032 ? 140 Counts/hour
(still without PID!!!)
29
Summary

• Event Generator UrQMD p A
• MVD Resolution
• Time of Flight
• Estimates of Data Rates
• Complete Analysis of pp?Y(3770)?DD

30
Outlook (Feb 2003 Meeting)
Status May 2003

• pbar-A background generator
• Generation of 107 pbar-p background events
• Introduction of the absolute time, (in
  progress) to allow studies of pileup
• Add more dead areas/materials
• Detailed studies of thresholds, etc.
• Layer of ToF between DIRC and EMC
• CsI at backward angles?
• Can ee- be selected/triggered (conversion in
  MVD)
• Improvement of the FastSim
• Evaluation of signal/background ratio
• Input for Trigger/DAQ
• Hypernucleus experiments

31
Outlook 2
group meeting Wed. 11-13

• Target (start detector?)
• Tof
• FS
• 3D Fieldmap
• Tracking (Kalman)
• Kinematic fitters
• Trigger simulations
• Physics Analysis for specific channels(e.g.
  Glueballs, DD, leptons, ff, gg, gg)