J.RItman PANDA Collab. Meeting, May 2003 Status of the PANDA Simulations Event Generator UrQMD p A...
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Transcript of J.RItman PANDA Collab. Meeting, May 2003 Status of the PANDA Simulations Event Generator UrQMD p A...
![Page 1: J.RItman PANDA Collab. Meeting, May 2003 Status of the PANDA Simulations Event Generator UrQMD p A MVD Resolution Time of Flight Estimates of Data Rates.](https://reader034.fdocuments.net/reader034/viewer/2022051417/5697c02a1a28abf838cd7c2a/html5/thumbnails/1.jpg)
J.RItmanPANDA Collab. Meeting, May 2003
Status of the PANDA Simulations
Event Generator UrQMD p A MVD Resolution Time of Flight Estimates of Data Rates “Complete” Analysis of pp(3770)DD Updated “to-do” list
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J.RItmanPANDA Collab. Meeting, May 2003
Using UrQMD for pA (A.Galoyan)
UrQMD ~OK but must be modified Galoyan&Polanski hep-ph/0304196
Multiplicity distribution Produced Particlesp (7 GeV/c) + Fe (10K events)
Multiplicity Mass [GeV/c2]
p,n
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J.RItmanPANDA Collab. Meeting, May 2003
Phase Space Distribution
All particles vs P Neutron dN/d
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J.RItmanPANDA Collab. Meeting, May 2003
MVD Resolution (A.Sokolov)
Investigate MVD resolution with pp4(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 m Increase diameter of the the beam pipe
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J.RItmanPANDA Collab. Meeting, May 2003
Vertex Resolution
D0 = radial distance Z0 = longitudinal distance
polar angle polar angle polar angle
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J.RItmanPANDA Collab. Meeting, May 2003
Increased Beam Pipe Diameter
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J.RItmanPANDA Collab. Meeting, May 2003
Z0 Resolution, R=40 mm Beam Pipe
Z0 increasesfrom ~13 m to ~18 m
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J.RItmanPANDA Collab. Meeting, May 2003
Systematic Error in Z0
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J.RItmanPANDA Collab. Meeting, May 2003
Momentum Resolution
mean resolution for pp4 events at 8 GeV
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J.RItmanPANDA Collab. Meeting, May 2003
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?
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TOP (Time of Propagation)
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DIRC vs ToF
DIRC is needed for P>600 MeV/c and ToF for P<600 MeV/c
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J.RItmanPANDA Collab. Meeting, May 2003
Estimated Data Rates (P.Salabura+JR)
Number of Readout Channels Mean Multiplicity Data per Event Event rate (107 Hz interactions)
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J.RItmanPANDA Collab. Meeting, May 2003
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 …
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J.RItmanPANDA Collab. Meeting, May 2003
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 ???
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J.RItmanPANDA Collab. Meeting, May 2003
Number of bits per Hit (rounded)
MVD Layer(4)+Coordinate(2x10)+sysID(8) = 32 STT Layer(4)+Wire(10)+Time(2x10)+sysID(8)= 48 MDCTLayer(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 …
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J.RItmanPANDA Collab. Meeting, May 2003
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
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J.RItmanPANDA Collab. Meeting, May 2003
Analysis of pp(3770)DD (JR)
Single D±K±± Selector (BR=9.1%) pp(3770)DD Background Estimates
report at GSI Docuserver:
http://www-new.gsi.de/onTEAM/tree/temp/1053448016/191053014637.ps
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J.RItmanPANDA Collab. Meeting, May 2003
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 M=7.3 MeV/c2 ~ 0.71
Z=22 m
VR [mm] VZ [mm]
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J.RItmanPANDA Collab. Meeting, May 2003
(3770) DD K+K-2++2-
M+-- [GeV]
10,000 Events
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J.RItmanPANDA Collab. Meeting, May 2003
Decay Vertex Location
Transverse Longitudinal
D [mm] Z [mm]
Only longitudinal coordinate sensitive to D-mesons !
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J.RItmanPANDA Collab. Meeting, May 2003
Proper Lifetime Determination
N(x) ~ exp{ - |V| M / (P c) }
|V|M/P
c = 292 ± 3 m
input 317 m
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J.RItmanPANDA Collab. Meeting, May 2003
DD Kinematical Variables
Missing Mass Squared Invariant Mass
(Mmiss)2 [GeV2] Minv [GeV]
N.B. (M)2 ~ 0.02 GeV2 ~ 31% (no PID)
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J.RItmanPANDA Collab. Meeting, May 2003
Fake D-Candidates from Background
Vertex Z - Location + - - Inv. Mass
Vz [mm] Minv [GeV/c2]
80,000 Events
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J.RItmanPANDA Collab. Meeting, May 2003
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 2/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
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J.RItmanPANDA Collab. Meeting, May 2003
Peak to Background Ratio
Assume a (3770) formation cross section of 160 nb
58
101
501
160001
80000100
31.0091.0
45
160
background
signal
2
2
mb
nb
BRbackground
signal
background
signal
L=1032 140 Counts/hour
(still without PID!!!)
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J.RItmanPANDA Collab. Meeting, May 2003
Summary
Event Generator UrQMD p A MVD Resolution Time of Flight Estimates of Data Rates “Complete” Analysis of pp(3770)DD
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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…
StatusMay 2003
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J.RItmanPANDA Collab. Meeting, May 2003
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,, *)
group meeting Wed. 11-13