1. You zhengyun, Mao yajun School of Physics , PKU 2003.12.17
BesMUC Current Status
You zhengyun, Mao yajun
School of Physics , PKU

2. BesMUC Reconstruction
Sketch
BesMUC Geometry
BesMUC Simulation
BesMUC Reconstruction

3. BOOST BesMUC Geometry Simu Geom generated automatically same position
Database or ASCII file
persistent geom data store
BesMUC
Gdml Writer
BesMUC.gdml
BOOST
Simu Geom
generated automatically
BES
Framework
Reco Geom
same position
same hierarchy

4. MUC Detector Construction BesMUC Simulation
BesMUC.gdml
BesMUC
MUC Detector Construction
Geometry
BesMUC Simulation
~100,000 lines
Time to read: ~17sec
in BOOST
MUC SD
MUC Sensitive Detector
Single particle event generator
CPU 1.2G : 0.05sec / event
>1000 event : crashed
G4Track
MUC Digit
MUC Hit
BesPersEvent
Persistent data store
Designed by myself
To disk :
“BesEvent.root”
Event
Display

5. A Barrel event :
particle : mu+ , p = 1.2Gev/c
θ = 90o , φ= 90o

6. A End-cap event :
particle : mu+ , p = 1.2Gev/c
cosθ = 0.7 , φ= 75o

7. BesMUCSD A G4 track BesMUCHit BesMUCDigit RPC gas chamber :
Sensitive Detector
A G4 track
BesMUCHit
a step in tracking;
: fEnergy,
fTime,
fPosition,
fDirection, ……
BesMUCDigit
simply project a hit to strip.
BesMUCDigit::GetNearestStrip();
: fPart,
fSegment,
fGap,
fStrip

8. A root class designed by myself, temporally for BOOST data store.
BesPersEvent
in file “BesEvent.root”
Object Persistency !
TTree
a Branch
BesPersEvent
event by event …
TClonesArray : BesMUCHit
members
a MUC Hit : fEnergy,
fPosition,
fPointerToMUCDigit, ……
TClonesArray : BesMUCDigit
a MUC Digit : fPart,
fGap,
TClonesArray : BesTrack
a Bes Track

9. BesMUC Reconstruction
in Bes Framework
BesMUCRec
Geometry
GapGeo
StripGeo
SoftID
Initialize
BesPersEvent
From disk :
“BesEvent.root”
BesMUCRec
RawHit
contains
BesMUCRec
HitContainer
:: Identifier?
Road
Finder

10. BesMUCRec RawHit BesMUCRec HitContainer : GetStripPointer( );
GetPosition( ); ……
BesMUCRec
HitContainer
: Init( );
AddHit(BesMUCSoftID *id);
GetHitPointer( );
GetGapHitCount( ); ……
RawHit Test Module
an example…

11. “BesEvent.root” Geometry ASCII files Geometry::Init( ); … … Data Flow
RawHit Test Module
Event
Display
“BesEvent.root”
3 single mu+ events
new BesMUCHit
Read Root file
Geometry ASCII files
Geometry::Init( );
GetHitPos( )
BesMUCRec
HitContainer
GetGapHitCount( )
Add Hit( )
Output
Hits on
gap 1 is 1
gap 2 is 1
gap 3 is 1
gap 4 is 2
gap 5 is 1
… …
Data
Flow

12. event 2 3 single mu+ events 10 digits part seg gap strip 0 7 0 15
event 0
event 1
event 2

13. Data
Flow
Geometry Data Store
Simu
Reco
Simu Data Store

14. Next work BesMUCRec RoadFinder; Some details in procedure;
Write documents;