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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. p. p,n. g. K. h. L S X. Multiplicity. Mass [GeV/c 2 ]. Using UrQMD for pA (A.Galoyan).

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status of the panda simulations
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

PANDA Collab. Meeting, May 2003

using urqmd for pa a galoyan

p

p,n

g

K

h

L S X

Multiplicity

Mass [GeV/c2]

Using UrQMD for pA (A.Galoyan)

UrQMD ~OK but must be modified Galoyan&Polanski hep-ph/0304196

Multiplicity distribution Produced Particles

p (7 GeV/c) + Fe (10K events)

PANDA Collab. Meeting, May 2003

phase space distribution
Phase Space Distribution

All particles Q vs P Neutron dN/dQ

Q

PANDA Collab. Meeting, May 2003

mvd resolution a sokolov
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

PANDA Collab. Meeting, May 2003

vertex resolution
Vertex Resolution
  • D0 = radial distance
  • Z0 = longitudinal distance

polar angle Q

polar angle Q

polar angle Q

PANDA Collab. Meeting, May 2003

increased beam pipe diameter
Increased Beam Pipe Diameter

PANDA Collab. Meeting, May 2003

z0 resolution r 40 mm beam pipe
Z0 Resolution, R=40 mm Beam Pipe

sZ0 increases

from ~13 mm

to ~18 mm

PANDA Collab. Meeting, May 2003

systematic error in z0
Systematic Error in Z0

PANDA Collab. Meeting, May 2003

momentum resolution
Momentum Resolution

mean resolution for pp4m events at 8 GeV

PANDA Collab. Meeting, May 2003

time of flight c schwarz
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?

PANDA Collab. Meeting, May 2003

dirc vs tof
DIRC vs ToF

DIRC is needed for P>600 MeV/c and ToF for P<600 MeV/c

estimated data rates p salabura jr
Estimated Data Rates (P.Salabura+JR)
  • Number of Readout Channels
  • Mean Multiplicity
  • Data per Event
  • Event rate (107 Hz interactions)

PANDA Collab. Meeting, May 2003

number of readout channels
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
  • +ToF+FS …

PANDA Collab. Meeting, May 2003

mean multiplicities pp 8 gev c
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
  • +ToF+FS ???

PANDA Collab. Meeting, May 2003

number of bits per hit rounded
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
  • +ToF+FS …

PANDA Collab. Meeting, May 2003

total data rates 10 7 hz
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
  • +ToF+FS … ?7?

25 GB/s

PANDA Collab. Meeting, May 2003

analysis of pp y 3770 dd jr
Analysis of ppY(3770)DD (JR)
  • Single D±Kp±p± Selector (BR=9.1%)
  • ppY(3770)DD
  • Background Estimates

report at GSI Docuserver:

http://www-new.gsi.de/onTEAM/tree/temp/1053448016/191053014637.ps

PANDA Collab. Meeting, May 2003

vertex resolution 1 d per event
Vertex Resolution (1 D per event)

Force the decay at V=(0.1,0.1,0.4) mm PD=3.3GeV/c

Combine + - - or -++ tracks (i.e. no PID) for reconstruction

M=1865 sM=7.3 MeV/c2e ~ 0.71

sZ=22 mm

VR [mm]

VZ [mm]

PANDA Collab. Meeting, May 2003

y 3770 dd k k 2 p 2 p
Y(3770)DD K+K-2p++2p-

10,000 Events

M+-- [GeV]

PANDA Collab. Meeting, May 2003

decay vertex location
Decay Vertex Location

Transverse

Longitudinal

D [mm]

Z [mm]

Only longitudinal coordinate sensitive to D-mesons !

PANDA Collab. Meeting, May 2003

proper lifetime determination
Proper Lifetime Determination

N(x) ~ exp{ - |V| M / (P ct) }

ct = 292 ± 3 mm

input 317 mm

|V|M/P

PANDA Collab. Meeting, May 2003

dd kinematical variables
DD Kinematical Variables

Missing Mass Squared Invariant Mass

(Mmiss)2 [GeV2]

Minv [GeV]

N.B. (Mp)2 ~ 0.02 GeV2 e ~ 31% (no PID)

PANDA Collab. Meeting, May 2003

fake d candidates from background
Fake D-Candidates from Background

80,000 Events

Vertex Z - Location

+ - - Inv. Mass

Vz [mm]

Minv [GeV/c2]

PANDA Collab. Meeting, May 2003

background suppression factors
Background Suppression Factors

80,000 input background events 6.6 GeV/c

3,144 D-Candidates (no PID!)

196 events with Vz > 0.1 mm

100 events with c2/dof < 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| < 0.002 GeV2

1/10 Minv ~ s

PANDA Collab. Meeting, May 2003

peak to background ratio
Peak to Background Ratio

Assume a Y(3770) formation cross section of 160 nb

L=1032  140 Counts/hour

(still without PID!!!)

PANDA Collab. Meeting, May 2003

summary
Summary
  • Event Generator UrQMD p A
  • MVD Resolution
  • Time of Flight
  • Estimates of Data Rates
  • “Complete” Analysis of ppY(3770)DD

PANDA Collab. Meeting, May 2003

outlook feb 2003 meeting

Status

May 2003

Outlook (Feb 2003 Meeting)
  • 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 e+e- be selected/triggered (conversion in MVD…)
  • Improvement of the FastSim
  • Evaluation of signal/background ratio
  • Input for Trigger/DAQ
  • Hypernucleus experiments…
outlook 2

group meeting Wed. 11-13

Outlook 2
  • 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*)

PANDA Collab. Meeting, May 2003

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